JP5606108B2 - Transmission line protection relay device - Google Patents

Description

  The present invention relates to a power transmission line protection relay device that protects a power transmission line from an accident, and more particularly, to a power transmission line protection relay device that prevents an unnecessary accident point from being disconnected when an accident is recovered in a short time. .

  The transmission line protection relay device performs a protection relay calculation based on the grid electricity information introduced from the instrument transformer (VT) and the instrument current transformer (CT) installed at the terminal of the transmission line to determine the accident point. It functions to detect and output a break command to the circuit breaker to remove the accident point.

On the other hand, arc horns are installed on insulation support insulators such as suspension insulators and long trunk insulators that support transmission lines with steel towers so that they will not be destroyed by lightning surge flashover. to allow for service restoration in a short period of time from when an accident occurs in about half-cycle "follow current interrupting arc horn" has been developed.

When a continuity interruption type arc horn and a transmission line protection relay device are installed in the power system, the accident recovery by the operation of the continuity interruption type arc horn is better than the accident point removal by the transmission line protection relay device. so fast, when the operation of the follow current interrupting arc horn successful service restoration is performed, it is necessary to prevent the interruption command from the power transmission line protective relay device, event, follow current interrupt arc When the operation of the horn fails, it is necessary to quickly remove the accident point by the transmission line protection relay device. That is, operation protection (time cooperation) is necessary for protection of both.

Conventionally, in order to realize this operation coordination, an on-delay timer delays a cutoff command from the main protection relay or operates and recovers faster than the main protection relay. A device has been devised such as locking the shut-off command of the electric device (for example, see Patent Document 1).
In addition, the continuous current interruption type arc horn is usually applied to a resistance grounding system transmission line of 154 kV or less and has a feature that a ground fault is always caused when it operates.

JP 2004-274840 A

  In a conventional power line protection relay device, an operation detection circuit for a continuous current interrupting arc horn is essential, and a circuit combining a change detection relay and an instantaneous value comparison relay that operate faster than the main protection relay is essential. However, there are disadvantages such as an increase in equipment costs and a time-consuming adjustment work for the circuit.

  Therefore, the present invention can prevent unnecessary operation with a simpler configuration in a power line protection relay device that protects a power line supported by an insulating support insulator equipped with a continuity interruption type arc horn, An object of the present invention is to provide a transmission line protection relay device that can cut off at a higher speed than the control of the interruption circuit by the conventional timer when the arc extinguishing by the continuous current interruption type arc horn fails. It is.

In order to achieve the above object, an invention according to claim 1 is a power transmission line protection relay device that protects a power transmission line by a lever device provided with a continuity interruption type arc horn, the power system including the power transmission line A protection relay that performs a protective relay operation using the amount of electricity taken in or the combined amount of electricity and outputs a shut-off command to the circuit breaker, and more than the protection relay using the taken amount of electricity or the combined amount of electricity An activation relay that performs accident detection at high speed, and the operation of the continuity interruption type arc horn is started based on the operation of the activation relay, and the protection relay is the continuity interruption type that has started operation. It is characterized by comprising suppression control means for suppressing a trip command to the circuit breaker by a command from the start relay for a predetermined time longer than the operating time of the arc horn .

  According to the present invention, the continuity interruption type arc horn operates normally by the suppression control means performing suppression control on the calculation means and determination means inside the protection control calculation processing unit based on the detection of the accident of the start relay. If this happens, the protection relay will prevent unnecessary interruption of the accident point (accident section). If the continuity interruption type arc horn does not operate, a trip command will be issued from the protection control arithmetic processing unit immediately after the fixed time has elapsed. The circuit breaker can be tripped immediately after output.

The block diagram which shows the structure of invention of the power transmission line protection relay apparatus of this invention. The block diagram which shows the structure of Embodiment 1 which concerns on the power transmission line protection relay apparatus of this invention. The hardware block diagram of the input part employ | adopted in Embodiment 1 of this invention. The detailed block diagram which shows an example of the starting relay employ | adopted in Embodiment 1 of this invention. FIG. 2 is a detailed configuration diagram of a main part of the first embodiment. Time chart when the Yes suppression control by follow current interrupting arc horn operation and suppression control means _6-3 in the first embodiment. The time chart when a power transmission line protection relay apparatus operate | moves by the continuous current interruption type | mold arc horn non-operation in Embodiment 1. FIG. The block diagram which shows the structure of Embodiment 2 which concerns on the power transmission line protection relay apparatus of this invention. The detailed block diagram of the principal part of this Embodiment 2. FIG. The block diagram which shows the structure of Embodiment 3 which concerns on the power transmission line protection relay apparatus of this invention. The detailed block diagram of the principal part of this Embodiment 3. FIG. The block diagram which shows the structure of Embodiment 4 which concerns on the power transmission line protection relay apparatus of this invention. The block diagram which shows a part of component of FIG. 12 in detail. The block diagram which shows the structure of Embodiment 5 which concerns on the power transmission line protection relay apparatus of this invention. The block diagram which shows the structure of Embodiment 6 which concerns on the power transmission line protection relay apparatus of this invention.

(Structure of the invention)
First, before describing each embodiment of the present invention, the configuration of the invention will be described.
FIG. 1 is a diagram showing the configuration of the present invention. 1 is a digital protection relay employing a microprocessor, and includes a current transformer (CT) 3 installed at a terminal of a transmission line 2 constituting a power system, and The current signal i and the voltage signal v respectively transformed by the voltage transformer (VT) 4 are captured by the input unit 5 and converted into digital data, and then input to the protection control arithmetic processing unit 6.

The protective control processing unit 6, in addition to the operation determining unit _6-2 which performs the motion determination for arithmetic unit _6-1 and the operation result of performing a predetermined protective control operation using the digital data input, a separately provided In addition, there is provided suppression control means _6-3 that performs suppression control according to a command from the starting relay 8. The trip command output from the protection control arithmetic processing unit 6 is input to a circuit breaker tripping circuit (not shown) via the interface 7.

The above-described activation relay 8 is constituted by an accident detection relay or the like, and when an accident is detected, among the three suppression control methods described below with respect to the suppression control means 6 _-3 provided in the protection relay 1. Any one of the above is implemented to prevent the trip command from being sent from the protective relay 1 to the circuit breaker for a predetermined time. Here, the predetermined time refers to a time that allows for a margin in the time for the continuity interruption type arc horn to operate normally in response to the duty accident and eliminate the accident after the transmission line accident occurs.

  Of the suppression control methods described above, the first suppression control method is digital data input from the input unit 5 to the protection control calculation processing unit 6, that is, before the protection control calculation processing is performed in the protection control calculation processing unit 6. The digital data is controlled to be suppressed for a predetermined time. In the second suppression control method, the protection control calculation processing unit 6 performs protection calculation processing according to the protection control program stored in advance, and then performs suppression control on the calculation processing result (from the protection control calculation processing unit 6). If you look at it, the protection calculation process can be said to be in the middle of calculation). Then, the third suppression control method suppresses the operation determination result of the protection control arithmetic processing unit 6 for a predetermined time.

The suppression control means _6-3 performs suppression control on the calculation means and determination means in the protection control calculation processing unit 6 based on the detection of the accident of the start relay 8, so that the continuous current interrupting arc horn operates normally. When this happens, the protective relay 1 prevents unnecessary interruption of the accident point (accident section). If the continuity interruption type arc horn does not operate, it trips from the protection control calculation processing unit 6 immediately after the fixed time has elapsed. The circuit breaker can be tripped immediately after outputting the command.

Hereinafter, embodiments of the present invention will be described.
(Embodiment 1)
Hereinafter, a power transmission line protection relay device according to Embodiment 1 of the present invention will be described with reference to the drawings. 2 is a block diagram showing the configuration of the power transmission line protection relay device according to the first embodiment of the present invention, FIG. 3 is a hardware block diagram of the input unit adopted in the first embodiment, and FIG. 4 is the first embodiment. FIG. 5 is a detailed configuration diagram showing an example of the adopted activation relay, and FIG. 5 is a detailed configuration diagram showing the main part of the first embodiment. 6 is a time chart in the case of the continuity interruption type arc horn operation and suppression control by the suppression control means _{6-3 in the} first embodiment, and FIG. It is a time chart when a power transmission line protection relay device operates.

(Constitution)
The configuration of the first embodiment will be described.
The first embodiment is an embodiment that adopts the first suppression control described above as the suppression control to the protection control arithmetic processing unit 6 by the activation relay 8. That is, before the protection control calculation process is performed by the calculation unit _6-1 of the protection control calculation processing unit 6 based on the operation of the activation relay 8, digital data (indicated as Is in FIG. 4) input from the input unit 5 is used. This is an embodiment in which an amount of electricity that is a predetermined amount of time suppression is applied.

In FIG. 2, a digital protection relay 1 employing a microprocessor includes current signals i transformed by a current transformer (CT) 3 and a voltage transformer (VT) 4 installed on a transmission line 2 constituting an electric power system. And the input unit 5 that takes in the voltage signal v and converts it into digital data and outputs it, and after performing digital filtering operation on the digital data output from the input unit 5, the amplitude value calculation processing and effective arithmetic unit _6-1 which performs arithmetic processing such value calculation processing or phase _processing, inhibition by a command operation determining unit _6-2 and later start relay 8 for operation determination on the operation result of the arithmetic unit 6 _-1 trip the protective control processing unit 6 having a suppression control means _6-3 for controlling, the results obtained with the protective control processing unit 6 to the circuit breaker And an interface 7 for outputting a decree.

As shown in detail in FIG. 3, the input unit 5 takes in the current signal i and the voltage signal v respectively transformed by the current transformer (CT) 3 and the voltage transformer (VT) 4 and converts them into voltage signals. part _5-1, analog filters _5-2 for outputting an electrical quantity of cut fundamental aliasing frequency at the time of sampling the input voltage signal outputted from the input conversion unit 5 _-1, the analog filter _5-2 sample-and-hold circuits _5-3 to hold samples the output at a predetermined period a predetermined _time, the multiplexer 5 _-4 outputting rearranges the output of the sample and hold circuit 5 _{-3 chronologically,} digital output of the multiplexer 5 _-4 and an analog / digital converter 5 _-5 Prefecture for converting the signal.

Next, an example of the activation relay 8 will be described in detail with reference to FIG.
Start relay 8, a calculation unit _28-1 for performing amplitude value calculation processing or the like after performing the digital filtering operation to input digital data output from the analog / digital converter 5 _-5 of the input section 5, a fault detection unit _8-2 which performs the operation determining process based on the set value in the calculation result of the calculating unit _28-1, a certain time the operation output of the fault detection unit _8-2 (follow current interrupting arc horn its work properly for responsibility accident refers to the time that an allowance of time for removing the accident) and a off-delay timer 8 _-3 and outputting the delayed speed than the protective relay 1 It is a kind of accident detection relay that detects accidents in power transmission lines.

The example of FIG. 4 shows a case where the accident detection unit _8-2 is realized by an undervoltage relay, and is configured to operate by detecting that the phase voltage Vs has dropped below the set value Vk.

When the start relay 8 do fault detection, before the protective control operation by the protective relay 1 suppression control provided in the unit _6-3 against by calculating unit 6 _-1 is performed, the input from the input unit 5 The digital data (denoted as Is in FIG. 2) is multiplied by a gain coefficient smaller than 1 for a certain period of time so that the input electric quantity itself is reduced and output. Here, the predetermined fixed time refers to a time in which the continuity interrupted arc horn normally operates with respect to the responsible accident and allows for a time to eliminate the accident.

It will now be described with reference to start the relay 8 and the protective control operation unit relationship between it and suppression control unit _6-3 that is inherent in 6 to FIG.
In FIG. 5, 9 is a change-over switch that performs a circuit switching operation according to a command output when the start relay 8 is operated, 10 is a bypass circuit, and 11 is a suppression control unit.

In the steady state in which the start relay 8 is not operating, that is, in the state where there is no accident in the transmission line 2, the suppression control means _{6-3 places} the movable contact of the switch 9 in the state of the solid line in FIG. And the digital data (Is) output from the input unit 5 is directly input to the arithmetic unit _{6-1. When an} accident occurs in the power transmission line 2 and the start relay 8 operates, Then, the movable contact of the switch 9 is switched from the bypass circuit 10 to the state of the broken line in the figure to connect the input unit 5 and the suppression control unit 11.

The suppression control unit 11 multiplies the input electric quantity (Is) by a coefficient (1 / k) smaller than ₁ and outputs an electric quantity having a magnitude of Is ′ = (1 / k) Is to the arithmetic unit _6-1 . Is configured to do. Since the calculation unit _6-1 performs protection control calculation based on the input electric quantity of Is ′ = (1 / k) Is for a certain time, and the determination unit _6-2 performs determination on the calculation result. No trip command is output from the protection control arithmetic processing unit 6.

(Function)
The operation of the first embodiment configured as described above will be described.
The input electric quantity transformed by the current transformer (CT) 3 and the voltage transformer (VT) 4 installed on the transmission line 2 is converted into digital data by the input unit 5 and outputted, and the protection control calculation processing of the protection relay 1 Input to the unit 6 and the start relay 8 respectively. When an accident occurs in the transmission line 2, a phenomenon such as an undervoltage, a ground fault overvoltage, or an overcurrent generally occurs regardless of whether or not a continuous current interrupting type arc horn is attached to the transmission line 2. To do. Also, when viewed from both ends of the transmission line, the differential current increases in the event of an internal fault.

Start relay 8 shown in FIG. 4, when the phase voltage for the undervoltage relay (Vs) becomes lower than the set value (Vk), and operates by detecting an accident of the power transmission line 2, the switching of the suppression control unit _6-3 A switching command is output to the switch 9. Change-over switch 9, disconnecting the bypass circuit 10, interposing the suppression control unit 11 between an input section 5 and the calculating section _6-1. For this reason, the calculation unit _6-1 performs the calculation based on the input electric quantity (Is ′) that has been reduced by the absolute value of (1 / k) times by the suppression control unit 11.

Period calculating section 6 _-1 performs the calculation based on the input electrical quantity (Is') is the time (system frequency follow current interrupting arc horn to remove the accident to be working properly for their responsibilities accidents 1 / 2 cycle to 1 cycle), and when this time has passed, the change-over switch 9 is restored, so that the calculation unit _6-1 calculates based on the input electric quantity (Is) input from the bypass circuit 10. It becomes like this.

  Hereinafter, a case where a lightning strike occurs in the transmission line and the continuity interrupted arc horn operates normally and the accident is removed, and a case where the accident continues without operating normally will be described.

(1) Case 1 in which a power transmission line accident is eliminated by a continuous current interrupting arc horn
The digital data output from the input unit 5 due to the occurrence of an accident such as a lightning strike is immediately input to the protection control arithmetic processing unit 6 and the activation relay 8 of the protection relay 1 respectively. Thus the protective control processing unit 6 performs an operation determination, but the operation determination unit 6 before the start relay 8 operates the suppression control unit _6-3 of the protective control processing unit 6 detects an accident _{- No} trip command is sent from ₂ .

  Then, if the continuous current interrupting arc horn operates normally with respect to the responsible accident within 1/2 cycle to 1 cycle from the occurrence of the accident, the accident is removed, so that the starting relay 8 and the protection relay 1 are restored. That is, if the continuous current interrupting arc horn operates normally for the responsible accident within 1/2 cycle to 1 cycle from the occurrence of the accident, the circuit breaker provided at the terminal of the transmission line 2 is the protection relay 1. It is not blocked unnecessarily. Therefore, after the accident is removed by the continuity interruption type arc horn, the power transmission line 2 can immediately recover the power transmission capability. As a result, there is no power outage or reclosing of the transmission line.

The time chart of FIG. 6 is a diagram showing the operation of case 1 described above, while the start relay 8 operates at a high speed due to the occurrence of a lightning accident and the suppression control means _6-3 is operated for a certain period of time. This shows how the fault interrupting arc horn was activated and the accident was removed in about 1/2 cycle after the accident occurred. As can be seen from FIG. 6, the trip command is not output from the protective relay 1 because the accident has been removed. Therefore, the circuit breaker connected to the power transmission line is not unnecessarily tripped, and it can be seen that the power transmission line immediately recovers the power transmission capacity after the accident removal by the continuity interruption type arc horn.

(2) Case 2 where the transmission line accident is not eliminated by the continuous current interrupting arc horn
Also in this case, as in the case 1 described above, the digital data output from the input unit 5 due to the occurrence of an accident such as a lightning strike is immediately input to the protection control arithmetic processing unit 6 and the activation relay 8 of the protection relay 1 respectively. As a result, the protection control arithmetic processing unit 6 determines the operation, but before that, the activation relay 8 detects an accident and operates the suppression control means _6-3 in the protection control arithmetic processing unit 6 to trip from the protection relay 1. Prevent commands from being sent.

When the continuation interruption type arc horn has failed to eliminate the accident when 1/2 cycle to 1 cycle has passed since the occurrence of the accident and reaches a set time with a slight margin, the changeover switch 9 is activated by the return of the start relay 8. It returns, and the suppression control means _6-3 does not operate.

As a result, since the suppression of the operation of the protection control calculation processing unit 6 is released and the accident state continues, the calculation unit _6-1 performs the protection control calculation based on the accident current input from the power transmission line. The operation result is determined as an accident by the operation determination unit _6-2 , and a trip command is immediately sent to the circuit breaker via the interface 7 to eliminate the accident.

  In this case, the trip command by the protective relay 1 is delayed by the operating time (1/2 cycle to 1 cycle) of the continuous current interrupting arc horn, but the continuous current interrupting arc horn is mainly used for the transmission line of the resistance grounding system. Therefore, the accident removal time of the protective relay 1 is not required to be as fast as the direct grounding type protective relay device.

The time chart of FIG. 7, or a diagram that shows the effect of the case 2 described, but starting relay 8 at a high speed is operated to operate the suppression control unit _6-3 by lightning accident occurs Ofudeitaima 8 _-3 When the suppression control means _6-3 is restored after the lapse of a certain time due to failure of accident elimination by the continuous current interrupting arc horn within the set fixed time, and the suppression control of the input electric quantity is released, the protection control calculation process The unit 6 can immediately detect the accident and remove the power circuit breaker to remove the accident.

  In the above description, the example in which the start relay 8 detects an accident due to an insufficient voltage (example in FIG. 3) has been described. However, the start relay 8 assumes that an increase in differential current is detected as an accident, and the protection relay 1 In the case of a current differential type relay, the same differential current is used for the accident detection of the start relay 8, so that the accident detection sensitivity of the start relay 8 and the protection control arithmetic processing unit 6 can be easily coordinated, and simple and reliable Suppression control becomes possible.

(effect)
As described above, according to the first embodiment, when a lightning strike occurs in the protection target, the activation relay 8 detects the accident at a higher speed than the protection relay 1, and the continuity interruption type arc with respect to the protection relay 1. Suppression control for a predetermined period of time that the trip command is output by the suppression control means _6-3 only during the time when the horn normally operates with respect to the responsible accident and eliminates the accident. Therefore, when the continuity interruption type arc horn operates normally, unnecessary interruption of the accident point (accident section) by the protective relay 1 can be prevented.

(Embodiment 2)
Next, a power transmission line protection relay device according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 8 is a block diagram showing a configuration of a power transmission line protection relay device according to the second embodiment of the present invention, and FIG. 9 is a detailed configuration diagram of a main part of the second embodiment.

(Constitution)
The configuration of the second embodiment will be described.
The second embodiment is an embodiment in which the above-described second suppression control is adopted as the suppression control to the protection control arithmetic processing unit 6 by the activation relay 8. That is, it is possible to perform the suppression control for a predetermined time based on the result of the protection control calculation process (denoted as Id in FIG. 8) performed by the calculation unit _6-1 of the protection control calculation processing unit 6 based on the operation of the activation relay 8. This is the embodiment. The calculation result of the arithmetic unit _6-1 is, when viewed from the protective control processing unit 6, it is also possible that intermediate computation.

  In FIG. 8, the same elements and means as those described in FIG.

In the second embodiment, as shown in FIGS. 8 and 9, the protection control calculation processing unit 6 has a configuration in which suppression control means 6 _-3 is arranged between the calculation unit _6-1 and the operation determination unit _6-2. In the steady state of the transmission line 2, the arithmetic unit _6-1 performs amplitude value arithmetic processing or effective value arithmetic processing on the digital data output from the input unit 5 according to the digital filtering arithmetic and protection control program. after performing processing such as phase shift processing, but performs the operation determined by the operation determining unit _6-2, during lightning accidents in the transmission line 2, suppressed by suppressing the control unit _6-3 by the operation of the start relay 8 Control is performed, and the operation determination unit _6-2 performs operation determination on the result of performing the suppression control.

When the startup relay 8 by lightning accidents transmission line 2 is operated, disconnecting the arithmetic unit _6-1 and the operation determining unit _6-2 change-over switch 9 switches the contact, the operation unit _6-1 and the operation determination unit 6 _{- 2} and the suppression control means _6-3 is interposed. As a result, the operation amount Id output from the operation unit _6-1 is passed to the suppression control unit _6-3.

The suppression control unit _6-3, the multiplication operation amount output from the arithmetic unit 6 _-1 to (Id), comprising less than 1 in suppression control section 11 (1 / k) coefficients as shown in FIG. 9 Thus, an operation amount of Id ′ = (1 / k) Id is output for a fixed time. Operation determination unit 6 operation amount is suppressed controlled to _-2 (Id ') or operation amount when the suppression control unit 11 bypasses (Id) is input. An accident determination, for example, a predetermined level excess determination is performed on the operation amount, and a trip signal is transmitted.

(Function)
In the second embodiment configured as described above, when a lightning strike accident has not occurred in the transmission line 2, the contact of the changeover switch 9 is connected to the bypass circuit 10 as shown by the solid line, so that the calculation of the calculation unit _6-1 is performed. The result is input to the operation determination unit _6-2 through the bypass circuit 10, but when the lightning strike accident occurs in the transmission line 2 and the start relay 8 detects the accident, the suppression control unit _6-3 detects the operation amount (Id). Is controlled by being multiplied by a certain time (1 / k) and outputting an operation amount of Id ′ = (1 / k) Id. The motion determination unit _6-2 performs motion determination based on the motion amount subjected to suppression control. In the case where the protection control arithmetic processing unit 6 is, for example, a current differential type, the differential current is set to be equal to or lower than the accident detection level or zero by performing suppression control. Therefore, the trip command is not sent from the protection relay 1 during the suppression control.

  In the case where the changeover switch 9 is restored by the return of the start relay 8 that failed to remove the accident when the continuity interruption type arc horn has passed a certain time (1/2 cycle to 1 cycle) after the occurrence of the accident, it is described above. As in the case of the first embodiment, the suppression of the operation of the protection control arithmetic processing unit 6 is released, and a trip command is immediately sent to the circuit breaker via the interface 7 to eliminate the accident.

(effect)
According to the second embodiment, suppression control means 6 _-3 inhibits the output of the protective control processing unit 6 by a predetermined time suppression control operation amount derived by the arithmetic section _6-1. Therefore, unnecessary operation of the protection relay 1 can be prevented.

(Embodiment 3)
Next, a power transmission line protection relay device according to the first embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a block diagram showing the configuration of the power line protection relay device according to the third embodiment of the present invention, and FIG. 11 is a detailed configuration diagram of the main part of the third embodiment.

(Constitution)
The configuration of the third embodiment will be described.
The third embodiment is an embodiment in which the above-described third suppression control is adopted as the suppression control to the protection control arithmetic processing unit 6 by the activation relay 8. That is, in this embodiment, the suppression control for a certain period of time is given to the determination result determined by the operation determination unit _6-2 of the protection control arithmetic processing unit 6 based on the operation of the activation relay 8.

  In FIG. 10, the same elements and means as those described in FIG.

Embodiment 3, as shown in FIGS. 10 and 11, the protection control processing unit 6 employs a configuration of arranging the suppression control unit _6-3 to the subsequent motion determination section _6-2, operation after the section _6-1 was subjected to arithmetic processing such as amplitude value calculation processing and an effective value arithmetic processing or phase operations according the digital filtering operation and protection control program to the digital data output from the input unit 5, the operation The operation is determined by the determination unit _6-2 , and in the event of a lightning strike on the transmission line 2, the suppression control unit _6-3 performs suppression control on the operation determination result of the operation determination unit _{6-2 by} the operation of the start relay 8. It is configured as follows.

The suppression control unit _6-3, adapted to the determination result output from the operation judging portion _6-2 as shown in FIG. 11, the operation output zero (out = 0) becomes operational at suppression control unit 11 Has been.

(Function)
In the third embodiment configured as described above, when a lightning strike accident does not occur in the transmission line 2, the contact of the changeover switch 9 is connected to the bypass circuit 10 as shown by the solid line, so that the operation determination unit _6-2 The operation output (out) is directly input to the interface 7 via the bypass circuit 10, but when the lightning strike accident occurs in the transmission line 2 and the start relay 8 detects the accident, the suppression control means _6-3 determines the operation for a certain period of time. The operation output (out) of the unit _6-2 is suppressed to zero (0), and finally, the trip command is not output. Therefore, the trip command is not output from the protection relay 1 for a certain period of time during which suppression control is performed.

  In the case where the changeover switch 9 is restored by the return of the start relay 8 that failed to remove the accident when the continuity interruption type arc horn has passed a certain time (1/2 cycle to 1 cycle) after the occurrence of the accident, it is described above. As in the case of the first embodiment, the suppression of the operation of the protection control arithmetic processing unit 6 is released, and a trip command is immediately sent to the circuit breaker via the interface 7 to eliminate the accident.

(effect)
According to the third embodiment, even if the relay operation output that detected the accident is passed to the suppression control means _6-3 , the operation output is controlled to be suppressed for a predetermined period of time. Not output. Therefore, unnecessary operation of the protection relay 1 can be prevented.

(Embodiment 4)
Next, a power transmission line protection relay device according to Embodiment 4 of the present invention will be described with reference to FIGS.

  The fourth embodiment is a further improvement of the first embodiment. FIG. 12 is a block diagram showing the configuration of the present embodiment. FIG. 13 shows some of the components shown in FIG. 12 in detail. It is a block diagram.

(Constitution)
The configuration of the fourth embodiment will be described.
In FIG. 12, the fifth embodiment disables the suppression control by the start relay 8 when the digital data output from the input unit 5 is an accident current whose magnitude cannot be eliminated by the operation of the continuous current interrupting arc horn. The means for adding is added to the above-described first embodiment, and the absolute value determination unit 12 that inputs the output from the input unit 5 with respect to FIG. 5 of the first embodiment, and the logical output of the absolute value determination unit 12 are An inversion knot circuit 13 and an AND circuit 14 for detecting coincidence between the output of the knot circuit 13 and the output of the start relay 8 are added. The absolute value determination unit 12 and the knot circuit 13 constitute means for invalidating the suppression control by the activation relay 8.

Similar to the activation relay 8, the absolute value determination unit 12 receives the digital data output from the analog / digital converter _5-5 of the input unit 5 and performs a digital filtering operation. an operation unit 12 _-1 to perform, and a determining unit _8-2 Metropolitan the magnitude of the fault current based on the set value Ik with the operation result of the arithmetic unit 12 _1. When the magnitude of the fault current (| If |) is larger than the set value (| Imax |) set to such a magnitude that the fault cannot be eliminated by the operation of the continuous current interrupting arc horn (| If |> | Imax |), The output signal “1” is sent out.

The suppression control means _6-3 performs the suppression control on the input signal by the output of the AND circuit 14, that is, the output of the logic circuit of the output of the activation relay 8 and the output of the absolute value determination unit 12 inverted.

(Function)
When a very large accident current flows due to an accident occurring in the transmission line 2 and the accident current exceeds the allowable value of the continuous current interrupting arc horn, the accident extinction fails. In this case, it is necessary for the power transmission line protection relay device to immediately send out a trip command without performing suppression control, and to remove the power circuit breaker to remove the accident.

According to the present embodiment, the magnitude of the input electric quantity passed from the input unit 5 to the start relay 8 and the absolute value determination unit 12 exceeds a predetermined level set to be equal to or greater than the allowable value of the continuous current interrupting arc horn. In this case, the output signal “1” is sent from the absolute value determination unit 12 at the same time when the activation relay 8 detects the accident. Since the output signal “1” from the absolute value determination unit 12 is inverted by the knot circuit 13 and input to the AND circuit 14, no switching command is sent from the AND circuit 14 to the changeover switch 9, and the suppression control unit 11 is bypassed. It remains connected to the circuit 10. For this reason, the protection control arithmetic processing unit 6 can output the trip command without the suppression control by the suppression control means _6-3 and eliminate the accident.

(effect)
As described above, according to the fourth embodiment, an accident occurs in a transmission line equipped with a continuity interrupting arc horn, and a large accident current that prevents the accident from being removed by the continuity interrupting arc horn due to the accident. When the start relay 8 detects an accident, the absolute value determination unit 12 also detects that the magnitude of the accident current (| If |) exceeds a predetermined level (| Imax |), and suppresses the control. Since the suppression control by the means _6-3 is not performed, the trip command can be immediately output from the protection control arithmetic processing unit 6 to eliminate the accident.

(Embodiment 5)
Next, a power transmission line protection relay device according to Embodiment 5 of the present invention will be described with reference to FIG. The fifth embodiment is an embodiment obtained by changing a part of the above-described fourth embodiment.

(Constitution)
The configuration of the fifth embodiment will be described.
In the fifth embodiment, the absolute value determination unit 12 of the fourth embodiment is replaced with a reclosing detection unit 15 as shown in FIG. 14, and the output of the reclosing detection unit 15 is a logic circuit of a knot circuit 13 and an AND circuit 14. It has a configuration added in. When a reclosing input command is output to a reclosing circuit of a circuit breaker (not shown), the reclosing detection unit 15 similarly inputs a reclosing input command (Rec). When “Rec” is input, a signal “1” is output.

When the circuit breaker of the power transmission line 2 is tripped by a trip command from the protection control arithmetic processing unit 6, a reclosing input command (Rec) is sent to close the circuit breaker again after a certain reclosing time has elapsed. In the fifth embodiment, the reclosing input command is fed back to the reclosing detection unit 15, and when the reclosing detection unit 15 detects the reclosing input command (Rec), it outputs an output signal that the reclosing has been performed. Send it out. The output signal of the reclosing detector 15 is inverted by the knot circuit 13 and input to the AND circuit 14 together with the output of the start relay 8. The AND circuit 14 suppresses the switching command when the start relay 8 is operated and the “1” signal is output from the knot circuit 13, that is, when the reclosing input command (Rec) is not output. outputs of _6-3 to the change-over switch 9. As a result, the changeover switch 9 is switched and the suppression control is activated.

(Function)
If the transmission line accident is not removed by the continuous current interrupting type arc horn, the reclosing circuit 15 outputs an output signal when the reclosing circuit is turned on after a predetermined time after the breaker is pulled off by the output of the protective relay device. Sent out. This output signal is to be inverted by the NOT circuit 13 will not be switching command from the AND circuit 14 even if the output signal is sent to the change-over switch 9 of the suppression control unit _6-3 from starting relay 8 is output.

  If reclosing fails even if a reclosing input command is sent, the activation relay 8 immediately detects an accident, but an output signal is sent from the reclosing detection unit 15 by a reclosing introduction command (Rec). A switching command is not sent from the AND circuit 14. Therefore, since the changeover switch 9 connects the input unit 5 and the bypass circuit 10, the protection control calculation processing unit 6 does not perform the suppression control, and outputs a trip command from the protection control calculation processing unit 6 to turn off the circuit breaker. It can be pulled back again.

(effect)
If the accident removal by the continuity interrupted arc horn is successful, the circuit breaker will not be tripped and no reclosing condition will occur. Therefore, the situation where the re-closure is carried out, since accidents believed to be of the type and accidents aspect that can not be removed by the follow current interrupting arc horn is more harm than good to perform the suppression control in suppression control means 6 _-3 .

According to the present embodiment 5, when detecting the reclosing in reclosing detector 15, the change-over switch 9 remain connected with the bypass circuit 10 without being transmitted is a switching command to the suppression control unit _6-3 The protection control calculation processing unit 6 does not perform the suppression control, and when the reclosing fails, a trip command can be output to release the circuit breaker again.

(Embodiment 6)
Next, a power line protection relay device according to Embodiment 6 of the present invention will be described with reference to FIG. The sixth embodiment is an embodiment obtained by changing a part of the above-described fourth embodiment.

(Constitution)
The configuration of the sixth embodiment will be described.
In the sixth embodiment, the absolute value determination unit 12 of the fourth embodiment is replaced with an operation detection unit 16 as shown in FIG. 15, and the output of the operation detection unit 16 is added by a logic circuit of a knot circuit 13 and an AND circuit 14. It has a configuration.

When the suppression control is performed, the suppression control unit 11 sends an operation signal to the operation detection unit 16. The operation detection unit 16 that has received the operation signal sends out an output signal “1” on the assumption that the suppression control has been performed after one cycle corresponding to the operation time of the continuity interruption type arc horn. The output signal from the operation detector 16 is inverted by the knot circuit 13 and input to the AND circuit 14 together with the output of the start relay 8. Switching output from the AND circuit 14 to the change-over switch 9 of the suppression control unit 6 _-3換指Ordinance is output a predetermined time after suppression control. The connection circuit is switched by the changeover switch 9 in response to this changeover command.

(Function)
When an accident occurs in the transmission line 2 to which the continuous current interrupting arc horn is attached and the suppression control is performed by the suppression control means _6-3 , the suppression control is prepared in preparation for the accident extinguishing failure by the continuous current interrupting arc horn. The protection relay device needs to send out a trip command without the operation of the protection control arithmetic processing unit 6 being suppressed again until a predetermined time later.

  Therefore, in the sixth embodiment, when the operation of the suppression control unit 11 is detected by the operation detection unit 16, for example, the selector switch 9 is bypassed after one cycle (the operation time of the continuous current interrupting arc horn is one cycle at the longest). Connect to circuit 10.

  As a result, if the power line accident is not removed by the continuous current interrupted arc horn, the circuit breaker will not be unnecessarily removed immediately after the start relay 8 detects the accident, but will operate after one cycle. The movable contact of the changeover switch 9 is connected to the bypass circuit by the detection unit 16 and the suppression control is released. Therefore, a trip command can be output from the protection control arithmetic processing unit 6 to trip the circuit breaker.

  In the sixth embodiment configured as described above, when the suppression control unit 11 operates, the output signal “1” is transmitted from the operation detection unit 16, and therefore, even if the output signal “1” is transmitted from the start relay 8. No switching command is sent from the circuit 14 to the changeover switch 9. The movable contact of the changeover switch 9 is normally connected to the bypass circuit 10, and remains connected to the bypass circuit 10 when no change command is sent from the AND circuit 14. That is, since the movable contact of the changeover switch 9 is connected to the bypass circuit 10, the trip command is sent from the protective relay 1 with the suppression control disabled.

(effect)
As described above, according to the sixth embodiment, when a power transmission line accident is not removed by the continuous current interruption type arc horn, the breaker is tripped unnecessarily immediately after the accident when the start relay 8 detects the accident. However, when the operation detection unit 16 detects the operation of the suppression control unit 11, after a predetermined time, for example, after the operation time of the continuity interruption type arc horn (1 cycle at the longest), By connecting the movable contact to the bypass circuit 10, it is possible to invalidate the suppression control by the suppression control unit 11 and immediately send a trip command from the protection relay 1 to the circuit breaker.

(Modification)
In the case of the above-described fourth, fifth, and sixth embodiments, as shown in FIGS. 12, 14, and 15, respectively, an example in which the output electric quantity of the input unit 5 is used as the input signal of the suppression control means _6-3. Although illustrated, the present invention need not be limited to this, and may be modified as follows.

For example, the operation determination unit 6 as calculating section 6 the operation amount output from _-1 as an input signal to the suppression control unit _6-3 or Figure 10 of the third embodiment, as shown in FIG. 8 embodiment 2 _- The output of No. ₂ may be used as an input signal to the suppression control means _6-3 , and it may be configured to suppress or zero-control each to a value equal to or less than an accident detection value.

DESCRIPTION OF SYMBOLS 1 ... Protection relay, 2 ... Transmission line, 3 ... Instrument current transformer (CT), 4 ... Instrument transformer (VT), 5 ... Input part, _5-1 ... Input converter, _5-2 ... Analog filter , _5-3 ... sample and hold circuit, 5 _-4 ... multiplexer, 5 _-5 ... analog / digital converter, 6 ... protective control processing unit, _6-1 ... calculating means, _6-2 ... operation determination unit, 6 _- DESCRIPTION OF SYMBOLS ₃ ... Suppression control means, 7 ... Interface, 8 ... Start relay, _8-1 ... Operation part, _8-2 ... Accident detection part, _8-3 ... Off-delay timer, 9 ... Changeover switch, 10 ... Bypass circuit, 11 ... suppression control means, 12 ... absolute value determination unit, 12 _-1 ... arithmetic unit, _12-2 ... determining unit, 13 ... NOT circuit, 14 ... aND circuit, 15 ... reclosing detector, 16 ... operation detecting unit.

Claims (7)

The insulator apparatus having a follow current interrupting arc horn, a power transmission line protective relay device which protects a power transmission line,
A protection relay that performs a protection relay calculation using the amount of electricity taken from the power system including the transmission line or the combined amount of electricity, and outputs a break command to the circuit breaker;
An activation relay that performs accident detection at a higher speed than the protective relay using the taken-in electric quantity or the combined electric quantity; and
The operation of the continuity interruption type arc horn is started based on the operation of the start relay,
The protection relay includes a suppression control unit that suppresses a trip command to the circuit breaker by a command from the start relay for a predetermined time longer than an operation time of the continuous current interrupting arc horn that has started operation . A power line protection relay device characterized by that.   The transmission line protection relay device according to claim 1, wherein the suppression control unit suppresses and controls an input electric quantity before a protection control calculation taken into the protection relay.   The power transmission line protection relay device according to claim 1, wherein the suppression control unit suppresses and controls an operation amount during calculation of the protection relay.   The power transmission line protection relay device according to claim 1, wherein the suppression control unit performs suppression control of the operation determination output of the protection relay.   When the amount of electricity taken in from the power system including the transmission line, the amount of electricity synthesized from them or the amount of differential current exceeds a predetermined level, the control of the suppression control means is invalidated. The power transmission line protection relay device according to any one of claims 1 to 4.   The transmission line protection relay device according to any one of claims 1 to 4, wherein control of the suppression control means is invalidated during reclosing.   The transmission line protection relay device according to any one of claims 1 to 4, wherein the control of the suppression control unit is locked for a predetermined time after the control by the suppression control unit is performed.

Images