JPS6258232B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a terminal circuit of a remote control system that uses a so-called remote control breaker that can be operated remotely and remotely controls the remote control breaker based on a transmission signal from a transmitter. It is something.

[Background technology]

2. Description of the Related Art Conventionally, remote control devices have been proposed that send control signals to a receiver located far from a transmitter to control a load, such as a light or a heater. Relays and semiconductor elements are generally used as load switching elements used in such remote control devices, and when considering overcurrent protection, it is necessary to use them in conjunction with breakers, fuses, etc. Therefore, recently, so-called remote control breakers that can be controlled remotely have been proposed for convenience of use.

Figure 1 shows a basic usage example of a remotely controllable breaker called a remote control breaker BR.
The excitation current is applied to the excitation coil L ₁ for driving the main contact opening/closing mechanism of the excitation coil L ₁ , auxiliary contact R ₁ , diode
D ₁ , commercial power supply V via the control switch SW circuit
The current flows from _S to excite the excitation coil _L1 , and as a result, the electromagnetic force from the excitation coil _L1 drives the main contact opening/closing mechanism (not shown) to turn on the main contact _r0 ,
At the same time, the auxiliary contact _r1 is switched from the a terminal to the b terminal side in conjunction with each other, thereby interrupting the excitation current flowing through the excitation coil _L1 . Also main contact r ₀ and auxiliary contact r ₁
The operating state of the main contact opening/closing mechanism is maintained mechanically. To return this operating state to its original state, that is, to turn off the main contact _r0 , switch the control switch SW to the b terminal side, or turn off the operation handle provided on the main contact opening/closing mechanism, or detect overcurrent. This is due to the main contact opening/closing mechanism turning off due to abnormality detection such as overcurrent detection of the mechanism, and the control switch
When SW is switched to b terminal, the control switch SW, diode _D2 , b terminal side of auxiliary contact _r1 ,
Current flows through the circuit of excitation coil _L1 , and the excitation coil
The electromagnetic force of L ₁ reverses the main contact opening/closing mechanism and turns off the main contact r ₀ . Simultaneously with this turning off, the auxiliary contact _R1 is switched from the B terminal to the A terminal side, cutting off the excitation current and then switching the control switch.
When the SW is turned on to the a terminal side, the excitation coil is turned on again.
It is provided so that an excitation current flows through _L1 in a direction to obtain the electromagnetic force to turn on the main contact _r0 .

By the way, a terminal circuit for operating such a remote control breaker BR by a remote control system using, for example, a power line carrier wave has been recently proposed. In other words, as shown in FIG. 2, a transmitter 1 and a receiver 2 are connected to a power line 3 which is a transmission line, and the receiver 1 transmits the address data of the receiver 2 and the control load connected to the receiver 2. A control signal consisting of control data for turning on or off the remote control breaker BR, etc. is superimposed and transmitted on the power line 3 as a power line carrier wave, while the receiver 2 receives the control signal transmitted from the transmitter 1 and transmits it in the received data. When the address data matches the own address, the next control data is fetched and the control switch SW is activated based on the control data.
The switching circuit used in place of the switch is driven, and an excitation current is passed in a predetermined direction through the excitation coil _L1 to turn on or off the remote control breaker BR, thereby turning on or off the load 4 connected to the main contact _r0 of the remote control breaker BR. That's what I do. By the way, remote control breaker
In the BR, the main opening/closing mechanism (not shown) is driven by an overcurrent detection configuration (not shown) to open the main contact _r0 , or the main opening/closing mechanism (not shown) is opened by manual operation using the operating lever 5. ) is driven to open and close the main contact _r0 . Here, for example, 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 BR 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 BR 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 BR side, there is a danger that, for example, the remote control breaker BR may turn on during maintenance work and a worker unaware of this may receive an electric shock. It was hot. In order 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 used to using a normal breaker, the off-lock will not work even if you turn off the operating lever 4. There is also the risk of forgetting to lock the power switch and rendering it useless.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks.
The purpose is to provide a terminal circuit for a remote control system that can prohibit manual operation on the remote control breaker side or prohibit operation from the transmitter side when a trip occurs due to overcurrent detection.

[Disclosure of the invention]

FIG. 3 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 line, 4 a load, and 5 an operating lever for a remote control breaker BR, 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 operation on the remote control breaker BR side, which is the main configuration of the present invention, and remote control from the transmitter 1 side, and if the operation is on the remote control breaker BR side, the operation on the transmitter 1 is determined. This is an operation determination circuit that prohibits. However, the terminal circuit of the remote control system is a remote control breaker.
It is composed of a BR, a receiver 1, and an operation determination circuit 6. FIG. 4 shows a specific circuit of the main part of one embodiment. Next, the operation of this embodiment will be explained based on this circuit diagram. The receiver 2 includes a signal processing section 2a,
The signal processing unit 2a is composed of a remote control breaker drive circuit 2b, etc., and the signal processing unit 2a includes demodulation means for receiving and demodulating the control signal superimposed on the power line 3, and modulation means for superimposing the return signal on the power line 3 as a carrier wave signal to the transmitter 1. means, logical means for creating the return signal from data inputted from the monitoring input terminal i, and comparing the address data of the control signal demodulated by the demodulation means with a preset own address so that they match. control determination means for capturing control data and generating a control output from an output port based on the control data when
If the received control data is ON data, an ON signal of "H" level is generated from the ON output port ON, and if it is OFF data, an OFF signal of "H" level is generated from the OFF output port OFF. The remote control breaker drive circuit 2b inputs the ON signal and OFF signal through the AND gates AND ₁ and AND ₂ , and if it is an ON signal, the switching means ( (not shown) is turned on, and if it is an off signal, the switching means provided in place of the b terminal of the control switch SW in the circuit in Figure 1 is turned on, and the direction of the excitation current is sent to the excitation coil _L1 built in the remote control breaker BR. control. The operation determination circuit 6 is connected to the power supply +V DD through the NOR gate NOR which inputs the ON signal and OFF signal, and the auxiliary contact r' ₁ which turns on and off in conjunction with the turning on and off of the main contact r ₀ of the remote control breaker _BR . Connected resistor R ₄
and an exclusive OR gate EOR which directly inputs the voltage across the resistor R ₄ to one input terminal and inputs it to the other input terminal via a delay circuit consisting of resistors R ₂ , R ₃ and capacitor C ₁ , and An AND gate AND ₃ which takes the AND of the output of the NOR gate NOR and the gate output of the exclusive OR gate EOR, and an RS which inputs the output of the AND gate AND ₃ to the set terminal S.
It consists of a flip-flop FF and a reset switch _SW1 which applies a power supply +V _DD voltage to a resistor _R1 when turned on and applies this voltage to the reset terminal R of the R-S flip-flop FF.
The voltage signal at both ends of R ₄ is processed by the signal processing unit 2a of the receiver 2.
input to the monitoring input terminal i of , and also supply the output of the exclusive OR gate EOR as a strobe pulse of the signal processing section 2a to the strobe signal input terminal ST;
Further, the output of the RS flip-flop FF is provided as the other input to the AND gates _AND1 and _AND2 .

Now, when a control signal having ON control data is transmitted from the transmitter 1 via the power line 3, the receiver 2
Then, when its own address and address data match, it takes in this ON control data and generates an ON signal from the ON output port ON as shown in FIG. 5a. On the other hand, the R-S flip-flop FF constituting the latch circuit is reset, for example, by some appropriate reset means when the power is turned on, and the output becomes the "H" level.
AND ₁ gives the above ON signal to the remote control breaker drive circuit 2b, and the remote control breaker drive circuit 2b drives the remote control breaker BR by passing an excitation current through the excitation coil _L1 of the remote control breaker BR so that the main contact _r0 is turned on. do. By the way, due to the generation of the ON signal, the gate output of the NOR gate NOR changes from the "H" level to the "L" level as shown in Fig. 5c.
It changes like this. On the other hand, when the main contact _r0 of the remote control breaker BR turns on, the auxiliary contact _r'1
is turned on as shown in FIG. 5d, and a voltage is generated across the resistor _R4 . This voltage signal is input to the monitoring input terminal i ₁ ' of the signal processing section 2a of the receiver 2. In addition, exclusive OR gate
A pulse signal is generated from the output end of the EOR as shown in FIG. 5e, 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 unit 2a uses the strobe pulse as a transmission strobe pulse to transmit the data when the monitoring input terminal i becomes "H", that is, the remote control breaker.
Information indicating that the BR has been turned on is sent back to the transmitter 1 as a return signal. Now, the pulse output timing of the exclusive OR gate EOR is the AND gate AND ₃ because the output of the NOR gate NOR is “L” level.
The output remains at the "L" level as shown in FIG. 5f, and the RS flip-flop FF is not set. Figure 5b shows the off signal output from the off output port OFF of the signal processing section 2a of the receiver 2 when the transmitter 1 sends off control data, and the off signal causes the remote control breaker BR to be activated. When the auxiliary contact _r'1 is turned off, the auxiliary contact r'1 is turned off, and at the time of the off-state, a pulse signal is outputted from the exclusive _OR gate EOR at the timing of the fall of the voltage of the resistor R4, but the RS flip-flop FF is not set. Further, when the pulse signal is generated, the signal processing section 2a of the receiver 2 receives data indicating that the monitoring input terminal i has become "L" level, that is, the remote control breaker BR.
The information that has been inverted is sent back to the transmitter 1.

Now, at time _t1 , when the main contact opening/closing mechanism is turned on by the operating lever 5 on the remote control breaker BR side and the main contact _r0 is turned off, the output of the Noah gate NOR does not change at all, but it is shown in Figure 5d. Similarly, the auxiliary contact _r'1 turns on, and a voltage is generated across the resistor _R4 . 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 BR 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 BOR is input to the set terminal S of the RS flip-flop FF via the AND gate _AND3 as shown in FIG. 5F. . Therefore, R-S flip-flop
FF is set to invert the output as shown in Figure 5g. Therefore and gate from then on
Since one input of AND ₁ and AND ₂ becomes "L" level, the ON signal and OFF signal from the signal processing section 2a of the receiver 2 cannot pass through the AND gates AND ₁ and AND ₂ . In other words, remote control using the transmitter 1 is prohibited. This prohibited state can be canceled by turning on the reset switch SW. That is, when the reset switch SW is turned on as shown in Fig. 5h, an "H" level signal is applied to the reset terminal R of the R-S flip-flop FF to reset it, and the output is as shown in Fig. 5g. The state returns from the "L" level to the "H" level.

In addition, the time t2 in Fig. ₅ 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 _r0 is turned off, and in this case, it is different from the above-mentioned on operation. Similarly, a pulse signal from AND gate AND ₃ and exclusive OR gate EOR is input to the set terminal of R-S flip-flop FF, setting R-S flip-flop FF, and remote control by transmitter 1 is prohibited. .

The transmitter 1 is equipped with a signal processing section similar to the receiver 2, which receives the return signal from the receiver 2 and transmits a control signal, and displays the operating status of the remote control breaker BR based on the data of the return signal. It's getting old.

FIG. 6 shows another embodiment of the present invention,
In such an embodiment, the receiver 2 is connected to a remote control breaker.
The BR 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.

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. 4 is inputted to the strobe signal input terminal ST of the signal processing section 2a of the receiver 2 via the OR gate OR. . Also, the signal processing section 2 of the receiver 2
The voltage signal of the resistor _R4 is inputted to the monitoring input terminal _i1 of the circuit a, and the Q output of the RS flip-flop FF is inputted to the other monitoring input terminal _i2 .
Furthermore, the voltage across resistor R ₁ is connected to capacitor C ₂ and resistor
The signal is inputted to one input terminal of the exclusive OR gate EOR ₀ via a delay circuit consisting of R ₅ and R ₆ , and directly inputted to the other input terminal. Also, in the receiver 2, the AND gates AND ₁ and AND ₂ are eliminated. 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 SW _a , and the OFF operation signal is output. input end
OFF to ₀ and gate AND ₅ and OFF operation switch
SW _b and connect each and gate through AND ₄ ,
The other input terminal of AND ₅ is connected to the output port O of the signal processing section 1a via an inverter IN.

Next, to explain the operation of this embodiment, in the operation from the transmitter 1 side, when the on operation switch SW _a or the off operation switch SW _b is turned on, in the normal state where the output port O is at the “L” level, the An “H” level signal is input to the ON or OFF operation signal input terminal ON ₀ or OFF ₀ via the gate AND ₄ or AND ₅ , and based on this input, the transmitter 1 sends ON or OFF control data. A predetermined control signal including this is created and superimposed 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 BR 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. The RS flip-flop FF is not set and the Q output does not change. Therefore, the signal processing unit 2a of the receiver 2 sends back to the transmitter ₁ the information that the state of the remote control breaker BR is inverted to ON or OFF based on the input data of the monitoring input terminal i 1, and also inputs the input data of the monitoring input terminal i _2. Since the data does not change, the remote control breaker BR returns information indicating that it was not operated on the remote control breaker BR side.

Next, when the remote control breaker BR is operated by the operation lever 5 of the remote control breaker BR (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 R-S flip-flop FF via AND gate _AND3 .
input to the set terminal S of the RS flip-flop FF. Therefore, the Q output is inverted, and 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 includes operation information of the remote control breaker BR and information on whether the remote control breaker BR has been operated on the remote control breaker BR 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 SW _a and SW _b will no longer be accepted. Therefore, operation from the transmitter 1 is prohibited. To release this state, it is sufficient to turn on the reset switch SW of the operation determination circuit 6. In this case, 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. It is reset, and the R-S flip-flop FF is Q.
Invert the output. Furthermore, when the "H" level signal rises, a pulse signal is generated from the exclusive OR gate EOR ₀ and is input to the strobe signal input terminal ST of the signal processing section 2 via the OR gate OR. In response to this input, the signal processing section 20 returns information that the input data at the monitoring input terminal _i2 has changed, that is, data indicating that the operation determination circuit 6 has been reset, together with data on the operating state of the remote control breaker BR. Signal processing unit 1a of transmitter 1 that received this return signal
changes the output of output port O from “H” level to “L”
Change to the level, and through the AND gates AND ₄ and AND ₅ , turn on operation switch SW _a , off operation switch
This makes it possible to capture the operation signal of SW _b .

FIG. 7 shows another embodiment circuit of the present invention, which is a combination of the embodiment shown in FIG. 4 and the embodiment shown in FIG.
When the BR side is operated, the receiver 2 side does not accept control from the transmitter 1, and the transmitter 1 is also made unable to transmit control signals.The operation of each part is similar to that in the embodiment shown in FIG. This is the same as the embodiment shown in FIG.

In addition to the above embodiments, there is a method for prohibiting remote control from the transmitter ₁ when the remote control breaker BR is operated on the remote control breaker BR side. There is also a method of turning off the transmission using a relay, or a method of prohibiting transmission using software processing on the transmitter 1 side, and a method of prohibiting transmission using the modem section of the signal processing section 1a of the transmitter 1. It goes without saying that these dimensions may be combined, and that appropriate methods other than these methods may be used. The power line carrier signal format includes a starter signal STR and address data AD, as shown in Figure 8a.
and the control (return) data CD, as shown in Fig. 8b.
As shown in the figure, one bit is set for a half cycle of the commercial power supply frequency, and then this half cycle is divided into four equal parts, and each of the divided parts is divided into sub-bits.For example, a start signal has a second part and a fourth part. A carrier wave is placed on the section to give a code of "0101," and as data "0," a carrier wave is placed on the second section to give a code of "0100," and data "1" is placed on the second to fourth sections. A carrier wave is placed in the interval and a code of “0111” is given, and these data “0”,
Address data AD and control (return) data CD are created by the combination of "1"s. 8th
Figure c shows a commercial power supply frequency zero-cross detection pulse for synchronizing the transmitter 1 and receiver 2. Of course, a remote control system using a power line transport system or a time division multiplex transmission system other than such a signal format may be used in the present invention.

〔Effect of the invention〕

The present invention includes a remote control breaker configured as described above, a receiver, and a transmitter and a receiver that detect the opening and closing of the main contact when the manual operating means of the remote control breaker is operated or when the above-mentioned abnormality is detected. It is equipped with an operation discrimination circuit that generates a detection output that prohibits operation by the remote control system, so if there is a manual operation on the remote control breaker side or a trip when an abnormality is detected, the remote control system consisting of the transmitter and receiver is automatically activated. Operation by the control system can be prohibited, and for example, there is no risk of electric shock to workers working on the terminal side due to accidentally turning on the remote control breaker with a control signal from the transmitter during maintenance, improving safety. It has the effect of being high.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a basic usage example using a remote control breaker, Figure 2 is a circuit block diagram of a conventional example,
3 is a basic circuit block diagram of an embodiment of the present invention, FIG. 4 is a specific circuit diagram of the same as the above, FIG. 5 is a time chart for explaining the operation of the same as the above, and FIG. 6 is a diagram of another embodiment of the present invention. 7 is a circuit block diagram of another embodiment of the present invention, and FIG. 8 is an explanatory diagram of the signal format of the power line carrier system used in each embodiment, where BR is a remote control breaker and 1 is a transmitter. , 2 is a receiver, 3 is a power line, 5 is an operating lever, 6 is an operation discrimination circuit, and 1b is a remote control relay drive circuit.

Claims (1)

[Claims] 1. A control signal is transmitted from a transmitter to a receiver via a transmission path, and the receiver turns on or off a control load based on the control signal, and also transmits operation information of the control load from the receiver. In the remote control system that sends data back to the transmitter, the main contact is opened and closed by manual operation means such as a control lever, and the main contact is opened when an abnormality such as excessive current or overcurrent is detected, and the main contact is energized when the excitation coil is energized. A remote control breaker having opening/closing means for opening and closing the main contacts according to the direction is provided as a control load, and when an on control signal is transmitted from the transmitter, the excitation coil is excited so that the main contacts are closed. , 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 transmitter; and when operating a manual operation means of a remote control breaker; and an operation discrimination circuit that detects the opening and closing of the main contact when the abnormality is detected and generates a detection output that prohibits operation by a remote control system consisting of a transmitter and a receiver at the time of detection. Control system terminal circuit. 2. The terminal circuit for a remote control system according to claim 1, wherein the operation of the drive means of the receiver is inhibited based on the detection output of the operation discrimination circuit. 3. Claim 1 or 3, characterized in that the detection output of the operation determination circuit is given to a receiver as operation information of the control load, and the receiver sends it back to the transmitter as data prohibiting the operation of the transmitter. Terminal circuit of the remote control system according to item 2.