JPH0320980B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a remote control system configured to remotely control and monitor a remote control breaker configured to be remotely controllable using a power line carrier control system or other remote control system. This relates to terminal circuits.

[Background technology]

For example, a remote control breaker using a remote control system using a power line carrier control method as shown in Figure 1 can be used.
Recently, terminal circuits that remotely control RBs have been proposed. In other words, as shown in FIG.
and the receiver 2 are connected to the power line 3 which is a transmission path,
From the transmitter 1, a control signal consisting of address data of the receiver 2, control data for turning on or off a remote control breaker RB, which is a control load connected to the receiver 2, etc. is transmitted as a power line carrier wave on the power line 3. On the other hand, the receiver 2 receives the control signal sent from the transmitter 1, and when the address data in the received data matches its own address, it takes in the next control data and controls the remote control based on the control data. The switching circuit that operates the remote control opening/closing means in the breaker RB is driven, and the excitation current is passed in a predetermined direction to the excitation coil (not shown) of the remote control opening/closing means to turn on or off the remote control breaker RB. The load 4 connected to the main contact (not shown) of RB is turned on or off. By the way, the remote control breaker RB is operated by the main opening/closing mechanism (not shown) by the abnormality opening means.
is driven to open and release the main contacts, or the main opening/closing mechanism (not shown) is operated manually using the operating lever 5.
It also has the function of opening and closing the main contacts by being driven. Here, for example, the remote control by the transmitter 1 described above may be performed at a location relatively far from the load 4, or the transmitter 1 may be equipped with a timer function to programmably control the load 4. On the other hand, the remote control breaker RB Possible side operations include an operation using the control lever 5 during maintenance, and a trip when detecting an overcurrent. Therefore, the remote control system using the remote control breaker RB as described above has the following problems.

In other words, if remote control is performed using the control signal from transmitter 1 during operation on the remote control breaker RB side, there is a danger that, for example, the remote control breaker RB may turn on during maintenance work and a worker who is unaware of this may receive an electric shock. It was hot. To avoid this, it is possible to install an off-lock switch in the terminal circuit that does not accept remote control from the transmitter 1, but if you are accustomed to using a normal breaker, even if you turn off the control lever 5, the off-lock switch will not work. There is also the fear that you will forget to lock the switch and it will be useless.

[Purpose of the invention]

The present invention was made in view of the above-mentioned problems, and its purpose is to provide a field operation lock that prohibits manual operation on the remote control breaker side or operation from the transmitter side when a trip occurs due to overcurrent detection. It is an object of the present invention to provide a terminal circuit for a remote control system which is provided with means and can be appropriately unlocked by the on-site operation lock means.

[Disclosure of the invention]

FIG. 2 shows an overall diagram of the remote control system that is the basis of the present invention, in which 1 is a transmitter, 2 is a receiver,
Reference numeral 3 denotes a power line as a transmission path, 4 a load, and 5 an operating lever for a remote control breaker RB, each of which basically operates in the same manner as each part of the circuit block shown in FIG. 6 in the figure distinguishes between the operation on the remote control breaker RB side, which is the main configuration of the present invention, and the remote control from the transmitter 1 side, and if the operation is on the remote control breaker RB side, the operation from the transmitter 1 is determined. This is an operation discrimination circuit that uses a prohibition circuit 7 to block the input of the output of the receiver 2 to the remote control breaker RB in order to prohibit the operation.The operation discrimination circuit 6 and the prohibition circuit 7 constitute a field operation lock circuit 8. Reference numeral 9 denotes a lock release circuit which releases a lock release signal when the lock release reset switch SW is operated and when a release command is output from the receiver 2 according to the content of the reception control signal. is sent to the operation discrimination circuit 6, and the blocking of the signal by the prohibition circuit 7 is canceled.

FIG. 3 shows a specific circuit of a main part of an embodiment of the present invention. Next, the operation of this embodiment will be explained based on this circuit diagram. The receiver 2 includes a signal processing section 2a,
The prohibition circuit 7 is composed of two AND gates _AND1 and _AND2 between the signal processing section 2a and the remote control breaker drive circuit 2b. The signal processing unit 2a includes demodulation means for receiving and demodulating the control signal superimposed on the power line 3, modulation means for superimposing the control signal on the power line 3 as a return signal carrier signal to the transmitter 1, and data input from the monitoring input terminal i. logical means for creating the return signal from the demodulating means, and comparing the address data of the control signal demodulated by the demodulating means with a preset own address, and when they match, fetching the control data and mode data. It is also equipped with a control determination means that generates an output signal from the control output port or the ON/OFF output port based on the control data or mode data, and if the received mode data is ON data, the output signal is output from the ON output port ON. “H” level on signal, or off output port for off data
It generates an OFF signal of "H" level from OFF, and also generates an output signal to the control output ports _O1 to _O4 according to the contents of the control data. The remote control breaker drive circuit 2b inputs the ON signal and OFF signal through the AND gates AND ₁ and AND ₂ which are the inhibition circuit 7, and if it is an ON signal, the remote control breaker is activated.
Switching means for RB on operation (not shown)
on, and if the signal is off, the remote control breaker
The switching means for turning off the RB is turned on to control the direction of the excitation current flowing through the excitation coil built into the remote control breaker RB. The operation determination circuit 6 is the main contact point of the NOAcade NOR which inputs the ON signal and OFF signal, and the remote control breaker RB.
A resistor connected to the power supply +V _DD through an auxiliary contact r′ ₁ that turns on and off in conjunction with r ₀ turns on and off.
R ₄ and an exclusive OR gate EOR in which the voltage across the resistor R ₄ is input directly to one input terminal and input to the other input terminal via a delay circuit consisting of resistors R ₂ , R ₃ and capacitor C ₁ . , an AND gate _AND3 which takes the logical product of the output of the NOR gate OR and the gate output of the exclusive OR gate EOR, and an R-S which inputs the output of the AND gate _AND3 to the set terminal S.
The voltage signal across the resistor _R4 is input to the monitoring input terminal i of the signal processing section 2a of the receiver 2, and the output of the exclusive OR gate EOR is input to the strobe pulse of the signal processing section 2a. is applied to the strobe signal input terminal ST, and the output of the R-S flip-flop FF is applied to the AND gate _AND1 , which is the inhibiting circuit 7.
This is given as an additional input to AND ₂ . Reference numeral 9 is a lock release circuit which includes a reset switch SW, a resistor _R'1 , a terminal voltage signal of this resistor _R'1 , and an output signal of the aforementioned control output port _O1.
The RS flip-flop FF of the operation determination circuit 6 is reset by the output of the OR gate OR.

Now, when a control signal having ON mode data is transmitted from the transmitter 1 via the power line 3, when the receiver 2 matches its own address with the address data, it takes in this ON mode data.
The ON output port ON generates an ON signal as shown in FIG. 4a. On the other hand, since the R-S flip-flop FF constituting the latch circuit is reset in the initial state, the output is at the "H" level, and therefore, the AND gate _AND1 gives the above-mentioned ON signal to the remote control breaker drive circuit 2b, The remote control breaker drive circuit 2b drives the remote control breaker RB by passing an excitation current through the excitation coil of the remote control breaker RB so that the main contact is turned on. By the way, due to the generation of the ON signal, the gate output of the NOR gate changes from the "H" level to the "L" level as shown in FIG. 4c. On the other hand, when the main contact of the remote control breaker RB is turned on, the auxiliary contact _r'1 is turned on as shown in FIG. 4d, and a voltage is generated across the resistor _R4 . This voltage signal is sent to the monitoring input terminal i ₁ of the signal processing section 2a of the receiver 2.
Enter. Also, as the voltage signal rises, the fourth
A pulse signal is generated as shown in FIG. e, and this pulse signal is input to the signal processing section 2a as a strobe pulse of the signal processing section 2a. Therefore, the signal processing section 2a
uses the strobe pulse as a transmission strobe pulse, and sends back to the transmitter 1 the data that the monitoring input terminal i has become "H", that is, the information that the remote control breaker RB has been turned on, as a return signal. Now, the pulse output timing of the exclusive OR gate EOR is as follows, since the output of the NOR gate NOR is at "L" level.
The output of the AND gate _AND3 remains at the "L" level as shown in FIG. 4f, and the R-S flip-flop FF is not set. Figure 4b shows transmitter 1
This shows the off signal output from the off output port OFF of the signal processing section 2a of the receiver 2 when the off control data is sent from the receiver 2. When the remote control breaker RB is turned off by the off signal, the auxiliary contact ₁
is turned off, and when the resistor R4 is turned off, a pulse signal is outputted from the exclusive OR gate EOR at the timing of the rise of the voltage of the resistor _R4 as described above, but the R-S flip-flop FF is not set. Further, when the pulse signal is generated, the signal processing section 2a of the receiver 2 returns to the transmitter 1 the data that the monitoring input terminal i has become "L" level, that is, the information that the remote control breaker RB has been turned off.

Now, at time _t1 , when the main contact opening/closing mechanism is turned on by the operating lever 5 on the remote control breaker RB side and the main contact is turned on, the output of the Noah gate NOR does not change at all, but as shown in Figure 4 d. The auxiliary contact r′ ₁ is turned on, and a voltage is generated across the resistor R ₄ . Therefore, at this generation timing, a pulse signal is generated from the exclusive OR gate EOR, and the signal processing section 2a of the receiver 2, which uses this pulse signal as a strobe pulse, returns the data that turned on the remote control breaker RB as a return signal in the same way as described above. do. On the other hand, since the output of the NOR gate NOR is at the "H" level, the pulse signal output from the exclusive OR gate EOR is input to the set terminal S of the R-S flip-flop FF via the AND gate _AND3 as shown in FIG. 4F. . Therefore, R-S flip-flop
FF is set to invert the output as shown in Figure 4g. Therefore and gate from then on
Since one input of AND ₁ and AND ₂ is at "L" level, the ON signal and OFF signal from the signal processing section 2a of the receiver 2 are outputted to the AND gate which is the inhibition circuit 7.
It becomes impossible to pass AND ₁ and AND ₂ . In other words, remote control using the transmitter 1 is prohibited. A lock release circuit 9 is provided to release the prohibition of remote operation by the prohibition circuit 7, which turns on the reset switch SW and connects the resistor _R1.
When a voltage signal is generated at both ends, or when the transmitter 1 sends control data that sets the control output port _O1 to "H" and receives the control data, the control output port _O1 of the receiver 2 becomes "H". When this happens, an “H” signal is generated at the output terminal of the OR gate, and the R-S
The flip-flop FF is reset and the lock by the inhibit circuit 7 is released. That is, now,
As an example of unlocking at the remote control breaker RB installation site, when the reset switch SW is turned on as shown in Fig. 4h, the R-S flip-flop
An "H" level signal is applied to the reset terminal R of the FF via the OR circuit OR to perform a reset, and the output returns from the "L" level to the "H" level state as shown in Figure 4g. Then, the signal cutoff operation by the prohibition circuit 7 is canceled.

Incidentally, the time _t2 in Fig. 4 indicates the timing when the main contact opening/closing mechanism is driven by the operation lever 5 (or a trip by the overcurrent detection mechanism) and the main contact is turned off.
In this case, as with the ON operation described above, the AND gate is
A pulse signal from the exclusive OR gate EOR from _AND3 is input to the set terminal of the R-S flip-flop FF, setting the R-S flip-flop FF, and remote control by the transmitter 1 is prohibited.

The transmitter 1 also includes a signal processing section similar to the receiver 2 that receives the return signal from the receiver 2 and transmits a control signal, and displays the operating status of the remote control breaker RB based on the data of the return signal. It's getting old.

FIG. 5 shows another embodiment of the present invention,
In such an embodiment, the receiver 2 is connected to a remote control breaker.
The RB side sends information that it has detected that it has been manipulated,
Based on this return signal, the transmitter 1 side is prevented from transmitting. In other words, a circuit corresponding to the prohibition circuit 7 of the embodiment described above is realized as the transmission control circuit 10 on the transmitter 1 side.

That is, on the terminal circuit side, the pulse signal of the exclusive OR gate EOR of the operation determination circuit 6 in the embodiment of FIG. 3 is inputted to the strobe signal input terminal ST of the signal processing section 2a of the receiver 2 via the OR gate _OR0 . In addition, the voltage signal of the resistor R4 is inputted to the monitoring input terminal _i1 of the signal processing section 2a of the receiver 2, and the voltage signal of the resistor _R4 is inputted to the other monitoring input terminal _i2 of the R-S flip-flop FF.
The Q output of
The voltage across R ₁ is input to one input terminal of the exclusive OR gate EOR ₀ via a delay circuit consisting of a capacitor C ₂ , resistors R ₅ and R ₆ , and directly to the other input terminal. . On the other hand, on the transmitter 1 side, the power supply +V _DD is connected to the ON operation signal input terminal ON ₀ of the signal processing section 1a of the transmitter 1 via the AND gate AND ₄ and the ON operation switch SWa, and the OFF operation signal input is performed. The terminal OFF ₀ is connected to the AND gate AND ₅ and the OFF operation switch SWb, and the output port O of the signal processing section 1a is connected to the other input side of each AND gate AND ₄ and AND ₅ via the inverter IN. A transmission control circuit 10 is constituted by the AND gates AND ₄ and AND ₅ and the inverter IN.

Next, to explain the operation of this embodiment, in the operation from the transmitter 1 side, when the on operation switch SWa or the off operation switch SWb is turned on, the output port O
In the normal state when the is at the "L" level, a "H" level signal is input to the ON or OFF operation signal input terminal ON ₀ or OFF via the AND gate AND ₄ or AND ₅ , and the signal is input to this input. Based on this, the transmitter 1 creates a predetermined control signal including on/off control data and superimposes it on the power line 3 as a carrier wave.

On the receiver 2 side, the remote control breaker drive circuit 2b is controlled to turn on or off the remote control breaker RB in the same manner as in the embodiment shown in FIG. In this case, the pulse signal from the exclusive OR gate EOR generated by the ON or OFF operation of the auxiliary contact _r'1 is output at the timing when the output of the NOR gate NOR becomes "L" level due to the ON signal or OFF signal. R-S flip-flop FF is not set and the Q output does not change. Therefore, the signal processing section 2a of the receiver 2 sends back to the transmitter ₁ the information that the state of the remote control breaker RB is inverted to ON or OFF based on the input data of the monitoring input terminal i1, and also transmits the input data of the monitoring input terminal _i2. does not change, so the remote control breaker RB returns information indicating that it was not operated on its side.

Next, when the remote control breaker RB is operated by the operation lever 5 of the remote control breaker RB (or trip by the overcurrent detection mechanism), the Noah gate
Since the output of NOR is at "H" level, the pulse signal output from exclusive OR gate EOR is sent to the R-S flip-flop via AND gate _AND3 .
It is input to the set terminal S of FF, and the R-S flip-flop FF is set. Therefore, the Q output is inverted,
This inverted signal is input to the monitoring input terminal _i2 of the signal processing section 2a. Therefore, the information returned from the signal processing section 2a of the receiver 2 is the operation information of the remote control breaker RB and the information that the remote control breaker RB has been operated on the remote control breaker RB side.
The signal processing section 1a of the transmitter 1 detects that the input data at the monitoring input terminal _i2 of the signal processing section 2a of the receiver 2 has changed, and based on this detection, an "H" level signal is output from the output port O. Output and gate
Fix the outputs of AND ₄ and AND ₅ to “L” level,
From now on, input signals for the on/off operation switches SWa and SWb will no longer be accepted. Therefore, operation from the transmitter 1 is prohibited. The lock release circuit 9 is
The R-S flip-flop FF is reset by the same configuration and operation as the circuit of the embodiment shown in FIG.
The locked state set by the operation on the remote control breaker RB side is released, but in this embodiment, it is necessary to send this lock release data back to the transmitter 1 side, so the R-S flip-flop is used as described above. The output of the FF is connected to the monitoring input terminal _i2 of the signal processing section 2a, and in order to create a strobe pulse to obtain the timing of this data return, the output of the OR gate OR of the lock release circuit 9 is connected to the exclusive OR gate EOR ₀ . When the OR gate OR output changes, a strobe pulse is given to the signal processing section, and the "L" level Q output signal of the R-S flip-flop FF reset by the OR gate OR output is monitored and input. It is returned to the transmitter 1 side as an input signal at the terminal _i1 , and returns the O output of the signal processing section 1a of the transmitter 1 to the "L" level. Now, in this embodiment circuit, when the reset switch SW is turned on, an "H" level signal is input to the reset terminal R of the R-S flip-flop FF, causing a reset, and the R-S flip-flop FF outputs the Q output. Invert. Further, when the "H" level signal rises, a pulse signal is generated from the exclusive OR gate EOR ₀ , and is inputted to the strobe signal input terminal ST of the signal processing section 2a via the OR gate OR. With this input, the signal processing unit 2a transmits information that the input data of the monitoring input terminal _i2 has changed, that is, data indicating that the operation determination circuit 6 has been reset, to the remote control breaker.
It is returned along with the RB operating status data. The signal processing unit 1a of the transmitter 1 that received this return signal changes the output of the output port O from the "H" level to the "L" level, and switches the ON operation switch SWa and the OFF operation via the AND gates _AND4 and _AND5 . Switch SWb
This makes it possible to capture operation signals.

FIG. 6 shows still another embodiment circuit of the present invention, which is a combination of the embodiment shown in FIG. 3 and the embodiment shown in FIG.
During operation on the RB side, the receiver 2 side does not accept control from the transmitter 1, and the transmitter 1 is also unable to transmit control signals, and the operation of each part is similar to that of the embodiment in FIG. This is the same as the embodiment shown in FIG.

In addition to the above embodiments, a method for prohibiting remote control from the transmitter 1 when the remote control breaker RB is operated on the remote control breaker RB side is to relay the drive power of the excitation coil of the remote control breaker RB on the terminal circuit side. There is also a method of turning off the transmitter 1, or a method of prohibiting transmission by software processing on the transmitter 1 side, and a method of prohibiting transmission by the modem part of the signal processing section 1a of the transmitter 1. It goes without saying that these methods may be combined or other appropriate methods may be used.

FIG. 7 shows an example according to the embodiment described in claim 2 of the present invention,
In the above-mentioned "on-site operation", there are two possible actions: the action when operating the operating handle 5, and the action due to the tripping of the abnormality release means.From a safety standpoint, in the former case, There is no problem even if the lock is released from a remote location, but in the case of the latter trip operation,
It is desirable to be able to release the lock only at the site where the remote control breaker RB is installed, and the embodiment shown in FIG. 7 provides such a function. Thus, the embodiment of FIG. 7 uses a remote control breaker RB having an alarm contact _r'2 that closes the contact when tripped, in contrast to the embodiment of FIG. 6 described above.
A second R-S flip-flop _FF0 is provided which is set by the output of the connection point between this alarm contact _r'2 and the resistor _R8 , and this second R-S flip-flop
Second reset switch SW ₀ to reset FF ₀
and the AND gates AND ₁ ′ and AND ₂ ′ constituting the above-mentioned inhibition circuit 7 are respectively ₃ -input AND gates.
The output of the second RS flip-flop _FF0 is input to one input terminal of _AND2 '. Therefore, in this embodiment circuit of FIG.
When the remote control breaker RB is not tripped, the alarm contact _r'2 remains and therefore the second
Since the R-S flip-flop _FF0 remains in the reset state, its output becomes "H", and the circuit operation at this time is exactly the same as in the embodiment of FIG. 6 described above. Next, this remote control breaker RB
When the tripping operation occurs, the alarm contact _r'2 closes due to the tripping operation, thereby setting the second flip-flop _FF0 , and its output becomes "L". This allows and gate
AND ₁ ′ and AND ₂ ′ are both prohibited from output, and the remote control breaker RB from transmitter 1
control becomes impossible. Also at this time, the second R-
The S flip-flop _FF0 maintains the set state of =L unless the second reset switch _SW0 is operated, and unless the second reset switch _SW0 is operated to release the lock by field operation, As long as no operation is performed to release the trip, the locked state caused by the trip operation will be maintained. Note that when the second reset switch SW ₀ is operated after this, the second R-S flip-flop FF ₀
is reset, its output becomes H, and the lock is released.The subsequent operation is the same as that of the embodiment shown in FIG. It is clear that the inhibition method using the second R-S flip-flop _FF0 can also be freely applied to the circuit system shown in the embodiment of FIG. 5 described above.

〔Effect of the invention〕

As described above, the present invention includes an operation discrimination circuit that determines whether the remote control breaker is operated by a control signal from a transmitter or by an on-site operation on the remote control breaker side, and this operation discrimination circuit determines whether the operation is caused by an on-site operation. The receiver is equipped with an on-site operation lock circuit that prohibits operation using control signals from the transmitter when it determines that something is wrong, so if there is a manual operation on the remote control breaker side or a trip when an abnormality is detected, , it is possible to automatically prohibit operations by the remote control system consisting of a transmitter and receiver. For example, during maintenance, if a remote control breaker is accidentally turned on with a control signal from the transmitter, a worker working at the terminal side may receive an electric shock. The on-site lock release means has the effect of completely eliminating the risk of such problems and high safety, and also allows the on-site operation lock circuit to be unlocked by on-site operation or by a release command by a control signal from a transmitter. For example, even if a maintenance worker forgets to release the lock, it is possible to perform the unlock operation from the transmitter side, greatly improving usability. It has the effect of

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram of the conventional example, Fig. 2 is a basic circuit block diagram of the present invention, Fig. 3 is a diagram of a concrete example of an improved circuit, Fig. 4 is a time chart for explaining the operation of the same, Fig. 5 6 is a circuit block diagram of another embodiment of the present invention, FIG. 7 is a circuit block diagram of another embodiment of the present invention, and FIG. 7 is a circuit block diagram of another embodiment of the present invention. It is a circuit block diagram of the embodiment, where RB is a remote control breaker, 1 is a transmitter, 2 is a receiver, 3 is a power line, 5 is an operating lever,
Reference numeral 6 represents an operation determination circuit, and reference numeral 8 represents an on-site operation lock circuit.

Claims (1)

[Claims] 1. A control signal is transmitted from the transmitter to the receiver via a transmission path, and the receiver controls the control load based on the control signal, and the operation information of the control load is transmitted from the receiver to the transmitter. form a remote control system to send back;
A manual operation means such as a control lever that opens and closes the main contact, an abnormality opening means that opens the main contact when an abnormality such as overcurrent or overcurrent is detected, and a main contact that opens and closes the main contact according to the excitation direction when exciting the excitation coil. A remote control breaker having a remote control opening/closing means for opening and closing is provided as a control load, and when a control signal for turning on is transmitted from the receiver, the excitation coil is excited so that the main contact is closed, and the transmitter In a terminal circuit of a remote control system, the terminal circuit of a remote control system includes a receiver having an excitation coil drive means that excites the excitation coil so that the main contact is opened when an off control signal is transmitted from the remote control breaker. The receiver includes an operation discrimination circuit that determines whether the remote control breaker is operated by a control signal from the transmitter or by on-site operation on the remote control breaker side, and this operation discrimination circuit determines that the operation is caused by on-site operation. An on-site operation lock circuit that prohibits operation using a control signal from a transmitter when it is determined that 1. A terminal circuit for a remote control system, comprising a lock release means. 2 The on-site operation lock circuit is provided with an operation content discrimination circuit that distinguishes operations performed by the on-site operation from normal manual operation means and operations using the abnormality release means, so that the on-site operation lock circuit can be locked by ordinary manual operation means. The on-site lock release means is configured so that the on-site operation lock circuit can be unlocked by either on-site operation or a release command, and the on-site operation lock circuit can be unlocked by the on-site operation alone by the abnormality release means. A terminal circuit for a remote control system according to claim 1.