JPH0154924B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protective relay device for protecting an electric power system, and more particularly to a protective relay device having a function of storing response status of the device.

In recent years, advances in digital technology have led to the development of devices using microcomputers in various technical fields.In the field of power system protection, digital protection relays (commonly known as digital relays) using microcomputers are also being developed. Type protective relay devices have been put into practical use.

This digital relay has a self-judgment function that conventional analog relays do not have, and a memory function that can store a large amount of information. By using these functions, it is possible to print out and record the response status of a digital relay and a digital protective relay device that incorporates this digital relay on a digital printer, etc. Recording functions are increasingly required.

In general, the responses of protective relays and protective relay devices that should be recorded include the following:

(i) Relay element that responds when an accident occurs (ii) Relay element that responds when the accident situation changes (iii) Trip output (iv) Relay return when the accident is cleared by the main protection device in other devices such as backup protection device (v) Fault removal failure determination (CBF detection) In a normal system accident, the system starts with the response in (i) above and ends with one of the responses in (iii) to (v). Therefore, the series of responses of the protective relay and the protective relay device to one system fault can be considered to have ended upon detection of any of the responses (iii) to (v) above.

By the way, the conventional method for printing out and recording the response status of the protective relay and protective relay device described above on a digital printer, etc. is to connect a digital printer to a digital relay. A method was used in which when the protective relay device responded, the response status was sequentially recorded on a digital printer. Therefore, if one digital printer is used to record the above-mentioned responses for multiple protection systems, if an accident occurs in multiple protection systems at the same time, the digital printer will have data on the response status for different protection systems. It will be recorded in a jumbled manner. Data recorded in this way is difficult to understand when used for data analysis, and difficult to handle when storing the recorded results.

This invention was made in order to solve the above problem, and a series of digital relay response status data for accidents in multiple protection systems is collected after determining that a certain period of time has elapsed since the occurrence of the first response status data. Edited for each protection system and recorded in the order of occurrence, this not only allows for easy-to-understand and easy-to-handle records, but also minimizes the impact on the memory of the digital relay's response data, which remains intact even if the digital relay becomes defective. It is an object of the present invention to provide a protective relay device having a recording function that can suppress the number of times.

This invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and in the figure, a first digital relay 1
₁ inputs, for example, each phase current input I ₁₁ to I _1N of the first circuit of a parallel multi-circuit power transmission line and determines the operation of a plurality of relay elements through digital calculation processing. The first digital relay ₁₁ is composed of, for example, a microcomputer, and its circuit configuration is well known, so a detailed explanation will be omitted here. The first digital relay 1 ₁ is
As a result of the operation determination, if it is determined that even one of the relay elements has operated, data indicating the operating relay element is output onto the first data bus ₃₁ , and the first
The write signal 4 ₁ is output. These signals are input to the control unit 2 constituting the recording unit 200. The control unit 2 is composed of a microcomputer having a conventional microprocessor, memory, and input/output devices. This recording unit 200 receives the first write signal 4 ₁
When the input of the first data bus 3 1 is confirmed, the first data bus 3 ₁
The above data is stored in the data memory 5 in the control unit 2, and a first end signal ₆₁ is output to the first digital relay ₁₁ . When the first digital relay 1 ₁ receives the first termination signal 6 ₁ , it stops outputting data onto the first data bus 3 ₁ . Further, when the accident aspect of the protected system changes, the first digital relay ₁₁ similarly transmits data regarding the operating relay elements to the control unit by digital calculation processing on the relay inputs _I11 to _I1N . Output to 2.

After determining the operation of the relay elements described above, the first digital relay ₁₁ outputs a first trip output 71 and outputs the first trip output ₇₁ when it confirms that the breaker trip condition is satisfied. Data indicating a trip output is output to the control unit 2 via the data bus ₃₁ .

Furthermore, the first digital relay ₁₁ outputs data to the control unit 2 in the following cases.

(1) When it is determined that the relay operation continues even after a certain period of time has elapsed after the trip condition has been established, and the system fault has not been removed; (2) A trip output is issued from another protective device, the fault has been removed, and the relay is activated. This is when he returned.

On the other hand, the second digital relay ₁₂
The protection system is different from that of the first digital relay ₁₁ , for example, it protects the second circuit of a parallel multi-line power transmission line, and the relay inputs _I21 to _I2N are input, and the protection system is different from that of the first digital relay ₁₁ . , the operation of a plurality of relay elements is determined by digital arithmetic processing. The data output from the second digital relay ₁₂ to the control unit 2 is
It is the same as the digital relay ₁₁ , and outputs the second write signal ₄₂ to the control unit ₂ via the second data bus 32.
The control unit 2 is connected to the second data bus 3.
When the acquisition of the data on ₂ is completed, a second completion signal 6 ₂ is output to the second digital relay 1 ₂ . Further, the second digital relay 1 ₂ outputs a second trip output 7 ₂ .

The control unit 2 connects the first and second data buses 3 _{1 and 3 2 to each other via the first and second data buses 3 1} and 3 ₂ , respectively.
and input data from the second digital relays 1 ₁ and 1 ₂ , but add data that allows identification of which digital relay the input data was output from, and also add data generation time data, The data is stored in the data memory 5. This data generation time data is output from the clock 8 to the control unit 2.

The control unit 2 searches for the data with the earliest occurrence time among the response data of the first digital relay ₁₁ and the second digital relay ₁₂ stored in the data memory 5, and The time of occurrence is compared with the current time obtained from the clock 8. When it is determined that a certain period of time has elapsed from the time of occurrence, that is, a series of predetermined response response times of relays, a series of response data for the relevant system accident is read out from the data memory 5 and transmitted via the third data bus 9. The signal is output to the recorder 10, and the launch of the recorder 10 is controlled by a control signal 11. still,
As the recorder 10, for example, a digital printer is used.

The output of a series of response data is completed by detecting any response data among trip output, relay return, fault removal failure judgment, or by detecting that there is no response data regarding the system in question. Then, the data in the data memory 5 that has been completed is cleared. When a series of response data has been ejected, the next ejection is performed in the same manner.

Furthermore, as the elapsed time before starting to record a series of response data, it is sufficient to select a time that is longer than the time required for the digital relay to determine failure of accident removal from the time of occurrence of the earliest data. It is on the order of a few seconds. This is because, after a system accident occurs, the most time-consuming response of the digital relay to this accident is the determination that the accident removal has failed, and all other responses have been completed by the time this response occurs.

FIG. 2 shows a response time chart in the circuit configuration of FIG. 1 according to the present invention described above.
FIG. 2 shows that the first system 1S _, which is the protection system of the first digital relay ₁₁ ,
A case is shown in which a system fault indicated by 2F occurs at time _t2 in the second system 2S, which is the protection system of the second digital relay ₁₂ , while this system fault is continuing. In the first system 1S, for the occurrence of a system accident 1F at time t ₀ , the first
The corresponding relay element in the digital relay 1 ₁ operates at time t ₁ after the delay time of the relay operation time. Response data 1 ₁ indicating this operation relay element
0 is sent to the control unit 2 via the first data bus ₃₁ . After the relay operates at time _t1 , the first trip output 7 is activated at time _t4 when the trip condition is satisfied.
₁ is output, but at the same time, data 2 indicating a trip output is output via the first data bus ₃₁ .
I is sent to control unit 2. When the first trip output ₇₁ is output at time t ₄ , 1FR is output at time t ₅ .
As shown in FIG. 2, the fault in the system is removed, and the operation of the first digital relay ₁₁ and the first trip output ₇₁ are restored at time _t6 . The second system 2S occurs at time _t2 while the first system fault is continuing, and in response to this fault, the corresponding relay element in the second digital relay ₁₂ is activated at time _t3 after the delay of the relay operation time.
It works. The response data 1 ₂ 0 indicating this operating relay element is sent to the control unit 2 via the second data bus 3 ₂ . After the relay operates at time _t3 , the second trip output ₇₂ is output at time _t7 when the trip condition is satisfied, but at the same time, data 2I indicating the trip output is transmitted via the second data bus ₃₂ . is sent to the control unit 2. second system 2
The accident at S is caused by the second trip output 7 ₂ at time t ₇
However, the accident has continued. Therefore, at time _t8 , when a certain period of time _T1 has elapsed from the relay operation time _t3 , the second digital relay 1
₂ , it is determined that accident removal has failed. This determination result is sent to the control unit 2 via the second data bus ₃₂ .

The control unit 2 receives the response data 1 1 0 of the first digital relay _{1 1} at times t ₁ and t ₄ as shown by 2I, and the response data 1 ₁ 0 of the first digital relay 1 1 at times t ₃ , t ₇ , and t ₈ . Relay 1 ₁ response data 1 ₂ 0
is input, and data that makes it possible to identify which digital relay 1 ₁ or 1 ₂ is output from each data and time data at the time of each data input are added and stored in the data memory 5. While importing this data, the control unit 2 acquires the response data at the time of the occurrence of the earliest system accident, that is, the time of occurrence of the response data 1 ₁ 0 at time t ₁ and the clock 8 .
Compare with the current time obtained from . And the time
From time _t9 when it is confirmed that the predetermined time _T2 has elapsed from _t1 , the response data ₁₁₀ of the first digital relay ₁₁ , that is, the relay operation at time _t1 and the trip output response at time _t4 . 1 from time t ₉ to time t ₁₀
00 on the recorder 10. When the ejection of the response data 1 ₁ 0 of the first digital relay 1 ₁ is completed, the control unit 2 next compares the time of the response data 1 ₁ 0 of the second digital relay 1 ₂ that occurred at time t ₃ with the current Compare with the time.

By the way, compared to the response time to a relay accident, the launch time of a recorder 10 such as 100 is usually much longer. Therefore, the time _t6 at which the ejection of the response data ₁₁₀ of the first digital relay ₁₁ ends is after the time _T2 has elapsed from the time _t3 . Therefore, the response data 1 ₂ 0 of the second digital relay 1 ₂ , that is, the relay operation at time t ₃ , the top output at time t ₈ , and the fault removal failure judgment at time t ₉ , are calculated from time t ₁₀ to time t ₁₁ . It is launched like 100.

FIG. 3 shows a processing flowchart regarding editing in the control unit 2 in the response shown in FIG. 2 described above.

The control unit 2 determines whether or not there is data in the data memory 5 to be outputted to the recorder 10 at F1. If it is determined that data exists as a result of the determination in F1, then in F2 a search process is performed for the earliest occurrence time of the data. After the current time is read from the clock 8 in F3, the two times are compared in F4, and if a certain period of time has not elapsed, the time is read from the clock 8 and the process returns to F3. Further, in F4, if it is determined that a certain period of time has elapsed as a result of the time comparison process, a process is performed in which data with the earliest occurrence time is outputted to the recorder 10 in F5. After this launch processing, a determination process is performed at F6 to determine whether the launch data is the end data of a series of responses. The end data is the response data of the failure determination of relay return fault removal, and the trip output is not the end data because there is a possibility that the fault removal failure determination continues. If the data is the end data at F6, the process returns to the start after erasing the data at F7. F
In the determination process of step 6, if it is determined that the data is not the end data, after the launch data is deleted in step F7, a series of response data that occurred following the data found in the search process of step F2 is edited and recorded in the order of occurrence. Next, a detection process is performed to search for the data generated at F8. As a result,
When there is no data, for example when an accident is removed from the trip output, it is determined that editing has ended and the process returns to the start. On the other hand, if there is launch data, the process returns to F5, the launch process. In this way, a series of response data is edited in the order of occurrence and output to the recorder 10.

As mentioned above, the response explanation in Fig. 2 is for the case where both the first and second digital relays 1 ₁ and 1 ₂ are healthy, but the response explanation when a device failure occurs is explained in the second section.
Do this using diagrams. First, consider the case where data 2I indicating the trip output at time _t4 is not sent to the control unit 2 due to a device failure in the first digital relay ₁₁ . At this time, the control unit 2
Only data indicating the operating relay element at time _t1 is sent to. In this case as well, the firing to the recorder 10 starts from time t ₁ as in the case when the device is healthy.
Started after T ₂ has elapsed, the first digital relay 1 ₁
Since the response data for is only the data for time t ₁ , the process ends by outputting only this data. In addition, in the failure mode where there is no data indicating the trip output at time t ₄ , if accidents occur in the first system 1S one after another, the end of the series of response data for the first accident cannot be detected. , a series of response data for successive accidents will be issued in succession, but the output of response data for accidents in the second system 1S will simply be delayed,
No problem.

Next, due to a device failure in the first digital relay 1 ₁ , data 2 indicating the operating relay element at time t ₁
Consider the case where I is not sent to control unit 2.
In this state, among the data stored in the data memory 5 in the control unit 2, the earliest occurrence time is the data indicating the operating relay element of the second digital relay ₁₂ at time _t3 . Therefore, the control unit 2 starts ejecting 100 the response data of the second digital relay ₁₂ to the recorder ₁₀ when the time T2 has elapsed from the time _t3 . There are no problems with this launch 100. Once this launch is complete, the first
The response data of digital relay ₁₁ at time _t4 is output.

The device failure of the first digital relay 1 ₁ has been described above, but the second digital relay 1 ₂
The same applies to equipment failures. Therefore,
Even if the first and second digital relays 1 ₁ and 1 ₂ become defective and the response data is not correctly sent to the control unit 2, the response data sent to the control unit 2 is reliably output to the recorder 10.

The above description has been made with reference to FIG. 1, which is an embodiment of the present invention.As can be seen from the above description, according to the present invention, a plurality of system fault signals sent from the digital relays 1 ₁ and 1 ₂ to the control unit 2 Response status data 2I for each protection system 1S and 2S,
In addition, since each system accident is edited and recorded in the order of occurrence, data can be easily understood and records that are easy to handle can be obtained. Furthermore, since the ejection 100 of the edited data to be recorded in the order of occurrence to the recorder 10 starts after a certain period of time has elapsed, even if the digital relays 1 ₁ and 1 ₂ become defective, the data will be reliably transferred to the recorder 10. It will not occupy the memory 5 of the control unit 2, and
The influence on the recording of response data of a healthy digital relay can be minimized.

As explained above, in the configuration shown in FIG. 1, the time data input from the clock 8 is used as a method for determining the timing for starting firing from the control unit 2 to the recorder 10, but the invention is not limited to this. The control unit 2 judges the contents of the data input from the first and second digital relays 1 ₁ and 1 ₂ and uses an internal counter etc. to calculate the elapsed time from the time when the control unit 2 judges that the data is related to a new system fault. A method of measuring can be used.
If this method is used, the same effect as the configuration shown in FIG. 1 will be obtained even without the clock 8.

FIG. 4 is a block diagram showing another embodiment according to the present invention. In FIG. 4, a main digital relay 20 has both the functions of the first digital relay ₁₁ and the control unit 2 in the configuration of FIG. Main digital relay 20
performs operation determination for a plurality of relay elements by input digital arithmetic processing of relay inputs I ₁₁ to _{I 1N} . If it is determined that one of the relay elements has operated as a result of the operation determination, data indicating the operating relay element is displayed on the recorder 10, data indicating that it is an element of the main digital relay 20, and time data input from the clock 8. is added and stored in an internal data memory (not shown). After the relay operation determination described above, the main digital relay 20
When it is confirmed that the breaker trip condition is satisfied, the first trip output ₇₁ is outputted, and the data indicating the trip output is stored in the data memory in exactly the same manner as when the relay operates as described above. . Other response data stored in the data memory for output to the recorder 10 is exactly the same as that of the first digital relay ₁₁ in the configuration of FIG.

The second digital relay ₁₂ is identical to that of the components of FIG. The difference is the second
The output of data to be sent to the recorder 10 from the digital relay ₁₂ is only outputted to the main digital relay 20.

The main digital relay 20 includes the main digital relay 2 stored in an internal data memory.
0 and the response data regarding the second digital relay ₁₂ are output to the recorder 10 via the third data bus 9. This output method is exactly the same as that of the storage unit 2 in FIG. 1, and the control signal 11 for controlling the recorder 10 is also output from the main digital relay 20.

The fourth embodiment is another embodiment of the present invention described above.
According to the configuration shown in the figure, the configuration shown in FIG. The control unit 2 is no longer necessary. However, in order to have the configuration as shown in FIG. 4, the main digital relay 20 needs to have enough processing capacity to perform other processing even if it performs arithmetic processing as a digital relay.

As described above, according to the configuration shown in FIG. 4, as long as the main digital relay is healthy, even if the second digital relay ₁₂ becomes defective, the output of response data to the recorder 10 will not be affected. , has the same effect as the configuration shown in FIG.

FIG. 5 is a block diagram showing still another embodiment according to the present invention. In the configuration shown in Figure 5,
The difference from FIG. 1 is that the clock 8 in FIG. 1 is not connected to the control unit 2A.
Therefore, in the control unit 2A, the elapsed time for outputting the response data to the recorder 10 is not determined, but the elapsed time is determined by the first digital relay _11A and the second digital relay _12A . This will be explained in detail below. When the first digital relay 1 ₁ A confirms the operation of the relay element due to the occurrence of a system fault, it starts measuring the elapsed time. As this measuring method, a method using an internal counter or the like used in general digital computers can be used. When it is confirmed that a certain period of time has elapsed, a first print start signal ₂₁₁ is output to the control unit 2A. The second digital relay _12A is also operated in exactly the same way.
A second print start signal 21 ₂ is output to the control unit 2A.

When the control unit 2A receives data 2I from the first digital relay _11A and the second digital relay _12A , it can identify which digital relay the input data 2I is output from. data is added and stored in the data memory 5 in the order of input. Then, when the first or second print start signals 21 ₁ , 21 ₂ are input, the data of the corresponding digital relays are output in the order in which they were input. Note that during printing to the recorder 10, the first or second print start signal 2
If 1 ₁ or 21 ₂ is input, the input is stored until the launch 100 corresponding to that start signal is started. The other configurations in FIG. 5 are exactly the same as in FIG. 1. According to FIG. 5, it is clear that it has the same recording function as FIG. 1, and therefore has the same effect.

As a modification of FIG. 5, the first and second digital relays _11A , _12A input time data from the clock 8, and the control unit 2 in FIG.
The same method can be used to determine the elapsed time in .

Furthermore, the present invention is not limited to the configurations shown in FIGS. 1, 4, and 5 described above, but may be configured as described below. In the configurations shown in Figures 1 and 5, two digital relays are processed by one recorder 10, but the same effect can be obtained even if the configuration includes three or more digital relays. That is clear. In the configuration shown in FIG. 4, one digital relay that controls the recording needle 10 is configured to send response data to another digital relay, but there are two or more digital relays that send response data. It is clear that they have exactly the same effect.

In the configurations of FIGS. 1, 4, and 5,
Although a case is shown in which each digital relay has one protection system, it may have a plurality of protection systems. In this case, in order to create a system that outputs a series of response data for each protection system at once, data that can identify the protection system should be added when outputting response data from each digital relay. . By adding this data, it is possible to collectively output a series of response data generated for each protection system, similar to the configurations shown in FIGS. 1, 4, and 5.

In the explanation of the response in the configurations of FIGS. 1, 4, and 5, the data output to the recorder is as follows:
Although I explained only the response results of the digital relay,
It is not limited to this, but it is possible to make the recorder's record more useful by adding data indicating the magnitude of the input at the same time as the response result, or distance measurement data of the accident point in the case of a distance protection method. It is possible. The response in this case is similar to that described above. It is clear that the present invention can be applied even if some of the reaction results described in FIGS. 1, 3, and 5 do not need to be recorded as the response results to be recorded. be.

As explained above, according to the present invention, a series of digital relay response status data for accidents in multiple protection systems is edited for each protection system after determining that a certain period of time has elapsed since the occurrence of the first response status data. Since the data is recorded in the order of occurrence, not only can records that are easy to understand and handle be left, but even if a digital relay becomes defective, the effect on the memorization of the response data of a healthy digital relay can be minimized. A protective relay device having a recording function can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a time chart showing the response in FIG. 1, FIG. 3 is a flow chart explaining the response in FIG. 1, and FIGS. The figures are block diagrams showing other embodiments of the present invention. 11, 12, 20...Digital relay, 2,
2A...Control unit, 8...Clock, 10...Recorder.

Claims (1)

[Scope of Claims] 1. A plurality of digital protective relays that input the amount of electricity in the power system and perform operation judgment through digital calculation processing, and data related to the response status output from the digital protective relays that input and perform protection. A control unit that edits and outputs response situation data for each system and each system accident in the order of occurrence, and a recorder that records the output data of this control unit, and a recorder that records the output data of the control unit, and records the response situation data after a certain period of time has elapsed since the first occurrence of the response situation data. After the digital protective relay or the control unit determines that the digital protection relay or the control unit has caused a failure, the control unit outputs edited output data to the recorder. 2. In what is stated in claim 1,
A protective relay device characterized in that a digital protective relay or a control unit inputs time data output from a clock device to determine the elapse of a response time. 3. A protective relay device according to claim 1 or 2, characterized in that one of the plurality of digital protective relays has the function of a control unit. 4 In what is stated in claim 1,
A protective relay device characterized in that the control unit edits data regarding the response situation after determining that a certain period of time has elapsed since the first occurrence of the response situation data.