CN113629866A - Remote control device and control method for distribution automation terminal - Google Patents

Remote control device and control method for distribution automation terminal Download PDF

Info

Publication number
CN113629866A
CN113629866A CN202110872895.8A CN202110872895A CN113629866A CN 113629866 A CN113629866 A CN 113629866A CN 202110872895 A CN202110872895 A CN 202110872895A CN 113629866 A CN113629866 A CN 113629866A
Authority
CN
China
Prior art keywords
relay
control
optocoupler
circuit
mcu
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110872895.8A
Other languages
Chinese (zh)
Other versions
CN113629866B (en
Inventor
马聪
赵小虎
葛林
刘钟琦
胡泽报
吴启文
陈秋平
郝加才
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CSG Smart Electrical Technology Co Ltd
CSG Smart Science and Technology Co Ltd
Original Assignee
CSG Smart Electrical Technology Co Ltd
CSG Smart Science and Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CSG Smart Electrical Technology Co Ltd, CSG Smart Science and Technology Co Ltd filed Critical CSG Smart Electrical Technology Co Ltd
Priority to CN202110872895.8A priority Critical patent/CN113629866B/en
Publication of CN113629866A publication Critical patent/CN113629866A/en
Application granted granted Critical
Publication of CN113629866B publication Critical patent/CN113629866B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Selective Calling Equipment (AREA)

Abstract

The invention discloses a remote control device and a remote control method for a distribution automation terminal, which belong to the technical field of distribution power terminals. Compared with the traditional distribution automation terminal, the system has the advantages of high safety, high reliability, high redundancy and high anti-interference capability, and solves the problems of weak anti-interference capability, easy misoperation or no action of the existing remote control.

Description

Remote control device and control method for distribution automation terminal
Technical Field
The invention relates to the technical field of power distribution power terminals, in particular to a remote control device and a remote control method for a power distribution automation terminal.
Background
In recent years, the development of smart power grids has higher and higher requirements on the automation level of a power distribution network, the application condition of a power distribution automation terminal device in a power distribution network directly determines the automation level of the power distribution network, and a remote control is used as one of three basic functions of the power distribution automation terminal, and the design and the use level also determine the application range and the performance level of the power distribution automation terminal device. At present, the main defects of the remote control part of the distribution automation terminal include the following aspects:
(1) the design scheme of the remote control part is that the switching-off/switching-on relay is controlled mostly through a corresponding circuit and an optical coupling control signal line, so that when the complex environment applied to the power distribution equipment is faced, the anti-interference capability is weak, and the malfunction or the non-action of the relay is caused.
(2) At present, a remote control scheme of a power distribution terminal does not have a corresponding hard processing scheme when an MCU is abnormal, most of the schemes are processed by software, and once an MCU program is blocked, the state of a remote control relay is uncertain or misoperation can be caused.
(3) The detection position and deployment logic of the conventional power distribution terminal remote control scheme during normal operation of the detection system are not comprehensive or unreasonable at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a remote control scheme of the distribution automation terminal, which has strong safety, high reliability, high redundancy and strong anti-interference capability.
In order to achieve the above object, in one aspect, the present invention provides a distribution automation terminal remote control device, which includes an MCU and a control interface thereof, wherein the control interface is connected to a power pre-control relay control and action circuit, a power pre-control relay protection circuit, a closing relay control and action circuit, an opening relay control and action circuit, and a relay anti-calibration circuit.
Further, the MCU and the interfaces thereof comprise 13 common IO ports of the MCU, namely IO1-IO 13; the power supply pre-control relay control and action circuits thereof are connected with IO2-IO5 in the MCU, and the labels are IO-1, IO-2, IO-3 and IO-4 respectively; the power supply pre-control relay protection circuit is connected with IO1 in the MCU, and the label is WDI; the switching-on relay control and action circuit thereof is connected with IO6 and IO7 in the MCU, and the labels are YK _ H1 and YK _ L1; the control and action circuits of the switching-off relay are connected with IO8 and IO9 in the MCU, and the labels are YK _ H2 and YK _ L2; the anti-correction circuit of relay is connected with IO10-IO13 in MCU, and the labels are YZFJYX1, YZFJYX2, YZFJYX3 and YZFJYX4 respectively.
Furthermore, the power supply pre-control relay control and action circuit comprises a logic sequence optocoupler control circuit and a power supply pre-control relay circuit; the power supply pre-control relay circuit is connected with the MCU and IO2-IO5 in the control interface of the MCU through a logic sequence optical coupler control circuit.
Further, the logic sequence optocoupler control circuit comprises an inverse Schmitt trigger U11, an inverse Schmitt trigger U12, a two-input AND gate U4 and a two-input AND gate U5, the MCU and the control interface thereof are IO2-IO5, and the labels are IO-1, IO-2, IO-3 and IO-4 respectively; (ii) a
An MCU interface label IO-1 is connected with a second input of the two-input AND gate U4, an MCU interface label IO-2 is connected with an input of the reverse Schmitt trigger U11, and an output of the reverse Schmitt trigger U11 is connected with a first input of the two-input AND gate U4; an MCU interface label IO-3 is connected with a second input of the two-input AND gate U5, an MCU interface label IO-4 is connected with an input of the reverse Schmitt trigger U12, and an output of the reverse Schmitt trigger U12 is connected with a first input of the two-input AND gate U5;
the output of the two-input AND gate U4 is connected with one end of a thin film resistor R5, and the other end of the thin film resistor R5 is connected with the anode of an optocoupler U6 and one end of a ceramic capacitor C10; the output of the two-input and gate U5 is connected with the other end of the ceramic capacitor C10 and with the cathode of the optocoupler U6.
Further, the power supply pre-control relay circuit comprises an optocoupler U6, a relay K3 and a freewheeling rectifier diode D7; the collector of the optocoupler U6 is connected with a +24V main power supply, the emitter of the optocoupler U6 is connected with a pin 8 of a coil of a power supply pre-control relay K3 and the cathode of a freewheeling rectifier diode D7, a pin 1 of a coil of the power supply pre-control relay K3 is connected with a +24V main power supply reference ground, a contact 3 of the power supply pre-control relay K3 is connected with a contact 6, a contact 4 is connected with the +24V main power supply, and a contact 5 is connected with the +24V remote control power supply.
Further, the power supply pre-control relay protection circuit comprises a watchdog chip U3, a ceramic capacitor C5, a ceramic capacitor C7, a thin film resistor R3, a thin film resistor R4 and a rectifier diode D4;
an input pin WDI of a watchdog chip U3 is connected with the MCU, an input pin WDI of a watchdog chip U3 is connected with one end of a thin-film resistor R4, a power supply pin VCC of the watchdog chip U3 is respectively connected with a system +3.3V, the other end of the thin-film resistor R4 and one end of a ceramic capacitor C5, the other end of the ceramic capacitor C5 is connected with a system ground, a ground pin GND of the watchdog chip U3 is connected with the system ground, an output pin/RST of the watchdog chip U3 is respectively connected with a cathode of a rectifier diode D4, one end of the thin-film resistor R3 and one end of the ceramic capacitor C7, the other end of the thin-film resistor R3 is connected with the system +3.3V, the other end of the ceramic capacitor C7 is connected with the system ground, an anode of the rectifier diode D4 is connected with an anode of the optocoupler U6, and the label is JPT.
Further, the switching-on relay control and action circuit comprises a switching-on relay K1, a rectifier diode D1, a rectifier diode D2, an optocoupler U1, a film resistor R1, a ceramic capacitor C1 and a ceramic capacitor C2;
one end of a film resistor R1 is connected with a pin YK _ H1 of the MCU, the other end of the film resistor R1 is respectively connected with an anode of an optocoupler U1 and one end of a ceramic capacitor C1, the other end of the ceramic capacitor C1 is respectively connected with a pin YK _ L1 of the MCU and a cathode of the optocoupler U1, a collector of the optocoupler U1 is connected with a +24V remote control power supply, an emitter of the optocoupler U1 is connected with an anode of a rectifier diode D1, and two ends of the ceramic capacitor C2 are respectively connected with a collector of the optocoupler U1 and an emitter of the optocoupler U1;
the cathode of the rectifier diode D1 is connected with one end of the coil of the closing relay K1 and the cathode of the rectifier diode D2 respectively, +24V ground is connected with the other end of the coil of the closing relay K1 and the anode of the rectifier diode D2 respectively, the contact 3 and the contact 6 of the closing relay K1 are connected, and the contact 4 and the contact 5 are connected to a closing switch respectively.
Further, the opening relay control and action circuit comprises a closing relay K2, a rectifier diode D3, a rectifier diode D5, an optocoupler U2, a film resistor R2, a ceramic capacitor C3 and a ceramic capacitor C4;
one end of a film resistor R2 is connected with a pin YK _ H2 of the MCU, the other end of the film resistor R2 is respectively connected with an anode of an optocoupler U2 and one end of a ceramic capacitor C3, the other end of the ceramic capacitor C3 is respectively connected with a pin YK _ L2 of the MCU and a cathode of the optocoupler U2, a collector of the optocoupler U2 is connected with a +24V remote control power supply, an emitter of the optocoupler U2 is connected with an anode of a rectifier diode D3, and two ends of the ceramic capacitor C4 are respectively connected with a collector of the optocoupler U2 and an emitter of the optocoupler U2;
the cathode of the rectifier diode D3 is connected with one end of the coil of the closing relay K2 and the cathode of the rectifier diode D5 respectively, +24V ground is connected with the other end of the coil of the closing relay K2 and the anode of the rectifier diode D5 respectively, the contact 3 and the contact 6 of the closing relay K2 are connected, and the contact 4 and the contact 5 are connected to the opening switch respectively.
Furthermore, the relay reverse calibration circuit comprises a power supply pre-control relay reverse calibration circuit, an on/off relay optocoupler action reverse calibration circuit, an on relay action reverse calibration circuit and an off relay action reverse calibration circuit; the input of the power supply pre-control relay reverse correction circuit is connected with a +24V remote control power supply of the power supply pre-control relay control and action circuit, and the label is +24 VK; the input of the on/off relay optical coupling action reverse correction circuit is simultaneously connected with one end of a corresponding on/off relay coil of the on/off relay control and action circuit and the off relay control and action circuit, and the label is YKFJ; the input of the closing relay action reverse correction circuit is connected with a closing relay contact 3 of a closing relay control and action circuit, and the label is HZFJ; the input of the action reverse correction circuit of the opening relay is connected with the opening relay contact 3 of the control and action circuit of the opening relay, and the label is FZFJ.
Furthermore, the power supply pre-control relay reverse correction circuit, the on/off relay optocoupler action reverse correction circuit, the on relay action reverse correction circuit and the off relay action reverse correction circuit are identical in structure and respectively comprise a rectifier diode, a first film resistor, a second film resistor, a first ceramic capacitor, a second ceramic capacitor and an optocoupler; the output of the power supply pre-control relay reverse correction circuit is connected with IO10 of the MCU, and the label is YZFJYX 1; the output of the on/off relay optocoupler action reverse correction circuit is connected with IO11 of the MCU, and the label is YZFJYX 2; the closing relay action reverse correction circuit is connected with an IO12 of the MCU, and the label is YZFJYX 3; the action reverse correction circuit of the opening relay is connected with the IO13 of the MCU, and the label is YZFJYX 4.
Taking a power supply pre-control relay reverse correction circuit as an example, the anode of a rectifier diode is connected with a +24V remote control power supply, the cathode of the rectifier diode is connected with one end of a second thin film resistor, the other end of the second thin film resistor is respectively connected with one end of a first ceramic capacitor and the anode of an optical coupler, the other end of the first ceramic capacitor is respectively connected with the cathode of the optical coupler and +24V ground, the collector of the optical coupler is respectively connected with one end of the first thin film resistor, one end of the second ceramic capacitor and a pin YZFJYX1 of the MCU, the other end of the first thin film resistor is connected with +3.3V of a system, and the emitter of the optical coupler is respectively connected with the other end of the second ceramic capacitor and the system ground.
In another aspect, a method for controlling a distribution automation terminal remote control device is provided, including:
(1) initializing a terminal, resetting the state of each control pin of the MCU to an initial state, and outputting a watchdog feeding signal;
(2) reading the anti-correction remote signaling signals of each part of the system, judging whether the remote signaling signals are abnormal or not, if not, executing the step (3), and if so, executing the step (10);
(3) before operation, turning on a power supply pre-control relay;
(4) judging whether the watchdog is normal or not, if so, executing the step (5), and if not, executing the step (10);
(5) judging whether the pre-control relay is normally opened or not through a power supply pre-control relay reverse correction circuit, judging whether the watchdog is normal or not, if so, executing the step (6), and if not, executing the step (10);
(6) switching on/off the gate, opening a corresponding switching on/off relay, judging whether the watchdog is normal or not, if so, executing the step (7), and if not, executing the step (10);
(7) judging whether the opening is normal and the locking is carried out according to an optical coupling action reverse correction circuit of the switching on/off relay, the switching on relay action reverse correction circuit or the switching off relay action reverse correction circuit, if so, executing the step (8), and otherwise, executing the step (10);
(8) after the operation is finished, recovering each control state of the MCU, judging whether the watchdog is normal or not, if so, executing the step (9), and if not, executing the step (10);
(9) the system waits for the next operation instruction;
(10) and reporting a fault, initializing a terminal, and resetting the MCU pin.
Compared with the prior art, the invention has the following technical effects: the strategy of the power supply pre-control relay is added, the power supply relay K3 must be pre-controlled before the opening/closing relay acts, normal attraction of the relay is guaranteed, the system main power supply +24V can normally supply power to the remote control main power supply +24VK, and the system has high level of the main power supply, strong anti-interference capability and stronger capability of resisting electromagnetic interference; the specific logic sequence starting function of the power supply pre-control relay is added, so that the risk of starting the remote control part by misoperation is reduced; a power supply pre-control relay protection circuit is added, a hard processing scheme is realized, and the robustness and stability of the system are enhanced; the whole loop sensing of the whole remote control part is comprehensively increased, and meanwhile, the system is strongly coupled with a control method, so that the reliability of the system is greatly increased.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
fig. 1 is a block diagram showing a configuration of a remote control device of a distribution automation terminal;
FIG. 2 is a diagram of the MCU and its interface structure;
FIG. 3 is a diagram of a control and action circuit of the power pre-control relay;
FIG. 4 is a diagram of a power supply pre-control relay protection circuit;
FIG. 5 is a diagram of a closing relay control and action circuit;
FIG. 6 is a structural diagram of a control and action circuit of the opening relay;
FIG. 7 is a schematic diagram of a power pre-control relay anti-calibration circuit;
FIG. 8 is a diagram of a circuit for correcting the action of the optical coupler of the on/off relay;
FIG. 9 is a diagram of a closing relay operation reverse calibration circuit;
FIG. 10 is a diagram of a circuit for checking the operation of the opening relay;
fig. 11 is a control flow chart of a distribution automation terminal remote control device.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1, the present embodiment discloses a distribution automation terminal remote control device, which includes an MCU and a control interface thereof, wherein the control interface is connected to a power supply pre-control relay control and action circuit, a power supply pre-control relay protection circuit, a closing relay control and action circuit, an opening relay control and action circuit, and a relay reverse calibration circuit.
As shown in fig. 2, the MCU and its interfaces include 13 general IO ports of the MCU, which are IO1-IO 13; the power supply pre-control relay control and action circuits thereof are connected with IO2-IO5 in the MCU, and the labels are IO-1, IO-2, IO-3 and IO-4 respectively; the power supply pre-control relay protection circuit is connected with IO1 in the MCU, and the label is WDI; the switching-on relay control and action circuit thereof is connected with IO6 and IO7 in the MCU, and the labels are YK _ H1 and YK _ L1; the control and action circuits of the switching-off relay are connected with IO8 and IO9 in the MCU, and the labels are YK _ H2 and YK _ L2; the anti-correction circuit of relay is connected with IO10-IO13 in MCU, and the labels are YZFJYX1, YZFJYX2, YZFJYX3 and YZFJYX4 respectively.
As a further preferred technical solution, the power supply pre-control relay control and action circuit includes a logic sequence optocoupler control circuit and a power supply pre-control relay circuit; the power supply pre-control relay circuit is connected with the MCU and IO2-IO5 in the control interface of the MCU through a logic sequence optical coupler control circuit.
Specifically, as shown in fig. 3, the logic sequence optocoupler control circuit includes an inverse schmitt trigger U11, an inverse schmitt trigger U12, a two-input and gate U4, and a two-input and gate U5, the connected MCUs and their control interfaces are IO2-IO5, and the numbers are IO-1, IO-2, IO-3, and IO-4, respectively;
an MCU interface label IO-1 is connected with the input (label is 2) of the two-input AND gate U4, the MCU interface label IO-2 is connected with the input (label is 1) of the reverse Schmitt trigger U11, and the output (label is 2) of the reverse Schmitt trigger U11 is connected with the input (label is 1) of the two-input AND gate U4; the MCU control interface IO-3 is connected with the input (the label is 2) of the two-input AND gate U5, the MCU interface label IO-4 is connected with the input (the label is 1) of the reverse Schmitt trigger U12, and the output (the label is 2) of the reverse Schmitt trigger U12 is connected with the input (the label is 1) of the two-input AND gate U5; the output (marked with 3) of the two-input AND gate U4 is connected with one end of a thin-film resistor R5, the other end of the thin-film resistor R5 is connected with the anode (marked with 1) of an optocoupler U6 and is connected with one end of a ceramic capacitor C10; the output (marked with 3) of the two-input and gate U5 is connected with the other end of the ceramic capacitor C10, and is also connected with the cathode (marked with 2) of the optocoupler U6.
The pre-control relay circuit comprises an optocoupler U6, a relay K3 and a freewheeling diode D7; the collector (marked with 4) of the optical coupler U6 is connected with a +24V main power supply, the emitter (marked with 3) of the optical coupler U6 is connected with a pin 8 of a coil of a power supply pre-control relay K3 and is connected with the cathode of a follow current rectifier diode D7, a pin 1 of the coil of the power supply pre-control relay K3 is connected with the +24V main power supply with reference ground, a contact 3 and a contact 6 of a power supply pre-control relay K3 are connected, the contact 4 is connected with the +24V main power supply, and a contact 5 is connected with the +24V remote control power supply.
When the MCU receives the action instruction, the MCU interface labels IO-1, IO-2, IO-3 and IO-4 respectively output 1,0,0 and 1. The output (labeled 2) of the inverted Schmitt trigger U11 is 1, and thus the output (labeled 3) of the two-input AND gate U4 is 1. The output (labeled 2) of the inverted Schmitt trigger U12 is 0, and thus the output (labeled 3) of the two-input AND gate U5 is 0. The two signals pass through an RC filter circuit which is composed of a film resistor R5 and a ceramic capacitor C10 and is used for eliminating disturbance, forward voltage is applied between an anode (the label is 1) of an optocoupler U6 and a cathode (the label is 2) of an optocoupler U6, so that a collector (the label is 4) of the optocoupler U6 and an emitter (the label is 3) of the optocoupler U6 are conducted, a +24V main power supply is arranged between a pin 8 and a pin 1 of a coil of a power supply pre-control relay K3, the relay acts, a contact 3 is in short circuit with a contact 4, a contact 5 is in short circuit with a contact 6, and therefore the +24V main power supply is connected with a +24V remote control power supply, and a subsequent closing relay and a separating relay are powered on. The freewheeling diode D7 prevents a self-inductance voltage during relay operation, thereby improving the interference resistance of the relay.
It should be noted that, the current traditional remote control scheme of the power distribution terminal is mostly to control the opening/closing relay through a corresponding circuit and an optical coupling control signal line, so that when the complex environment applied to the power distribution equipment is faced, the control signal is low in level and weak in anti-interference capability, and the relay malfunctions or does not act.
In the embodiment, a strategy of increasing a pre-control power supply relay is adopted, the pre-control power supply relay K3 is powered on firstly before the opening/closing relay acts, the normal suction of the relay is ensured, the system main power supply +24V can normally supply power to the remote control main power supply +24VK, and the capacity of resisting electromagnetic interference is stronger because the main power supply has higher level and strong anti-interference capacity; meanwhile, the capability of preventing misoperation of the control signal of the power supply pre-control relay is enhanced, and a reverse Schmitt trigger U11, a reverse Schmitt trigger U12, a two-input AND gate U4 and a two-input AND gate U5 are added, so that only a specific level signal 1001 is output at IO-1, IO-2, IO-3 and IO-4 of the MCU, the anode (the label is 1) of the optocoupler U6 can be enabled to be at a high level, the cathode (the label is 2) of the optocoupler U6 is at a low level, and the optocoupler U6 can be switched on, so that the power supply pre-control relay acts, and the purpose is achieved.
As a further preferable technical solution, as shown in fig. 4, the power supply pre-control relay protection circuit includes a watchdog chip U3, a ceramic capacitor C5, a ceramic capacitor C7, a thin-film resistor R3, a thin-film resistor R4, and a rectifier diode D4;
an input pin WDI (pin 4) of the watchdog chip U3 is connected to the MCU (pin WDI), while an input pin WDI (pin 4) of the watchdog chip U3 is connected to one end of the thin-film resistor R4. The power supply pin VCC (pin number 5) of the watchdog chip U3 is connected to the +3.3V system, to the other end of the thin film resistor R4, and to one end of the ceramic capacitor C5, while the other end of the ceramic capacitor C5 is connected to the system ground. The ground pin GND (pin No. 2) of the watchdog chip U3 is connected to system ground. The output pin/RST (pin 1) of the watchdog chip U3 is connected to the cathode of the rectifier diode D4, and also to one end of a thin-film resistor R3 and a ceramic capacitor C7, while the other end of the thin-film resistor R3 is connected to +3.3V of the system, and the other end of the ceramic capacitor C7 is connected to the system ground. The anode of the schottky diode D4 is connected to the anode (labeled 1) of the optocoupler U6. When the MCU operates normally, the MCU control interface (labeled WDI) will pull up through the thin film resistor R4 to output the dog feeding signal, the watchdog chip U3 will receive the back output pin/RST (labeled 1) and pull up through the thin film resistor R3 to output the high level, and the anode and cathode of the schottky diode D4 will not be turned on due to insufficient voltage difference. Once MCU card is dead or the procedure runs away, MCU will not correctly output and feed the dog signal, and watchdog output/RST (base pin label is 1) will export the low level, and schottky diode D4 will switch on, draws the level of the positive pole (label is 1) of opto-coupler U6 to the low level, causes the unable normal action of opto-coupler U6 to the back level circuit has been blocked. The ceramic capacitor C5 and the ceramic capacitor C7 function as decoupling of the system +3.3V power supply and filtering of the gate dog output signal/RST.
It should be noted that, the conventional power distribution terminal remote control scheme does not have a corresponding hard processing scheme when the MCU is abnormal, and most of the schemes are processed by software, and once the MCU program is blocked, the state of the remote control relay may be unstable or malfunction may be caused.
In this embodiment, a power supply pre-control relay protection circuit, namely, the watchdog U3 and its circuit, is added to solve the problem, after the MCU initialization is completed, a watchdog output/RST (pin 1) output high level must be guaranteed by continuously outputting a watchdog signal according to program logic, and at this time, the power supply pre-control relay controls the optocoupler U6 to normally operate, that is, the anode (pin 1) of the optocoupler U6 is high level, the cathode (pin 2) of the optocoupler U6 is low level, because the watchdog program is in the MCU main loop, once the MCU is stuck or the program runs, the MCU will not correctly output the watchdog signal, the watchdog output/RST (pin 1) will output low level, the high level of the anode (pin 1) of the optocoupler U6 will be pulled to low level through the schottky diode D4, causing the locking of the optocoupler U6, no matter what the state of the rest pins of the MCU is, the power supply pre-control relay can not normally supply power to the closing/opening relay, so that a hard processing scheme is realized, and the robustness and the stability of the system are enhanced.
As a more preferable technical solution, as shown in fig. 5, the closing relay control and operation circuit includes a closing relay K1, a rectifier diode D1, a rectifier diode D2, an optocoupler U1, a thin-film resistor R1, a ceramic capacitor C1, and a ceramic capacitor C2;
one end of a film resistor R1 is connected with an MCU control interface IO6 (the label is YK _ H1), and the other end of the film resistor R1 is connected with an anode (the label is 1) of an optocoupler U1 and one end of a ceramic capacitor C1; the other end of the ceramic capacitor C1 is connected with an MCU control interface IO7 (the label is YK _ L1) and a cathode (the label is 2) of an optocoupler U1; a collector (labeled 4) of the optocoupler U1 is connected with a +24V remote control power supply, an emitter (labeled 3) of the optocoupler U1 is connected with an anode of the rectifier diode D1, and two ends of the ceramic capacitor C2 are respectively connected with the collector (labeled 4) of the optocoupler U1 and the emitter (labeled 3) of the optocoupler U1; the cathode of the rectifier diode D1 is connected with one end (marked with 1) of the coil of the closing relay K1 and the cathode of the rectifier diode D2, and the +24V ground is connected with the other end (marked with 8) of the coil of the closing relay K1 and the anode of the rectifier diode D2; and a contact 3 and a contact 6 of the closing relay K1 are connected, and a contact 4 and a contact 5 are respectively connected with a closing switch. When the MCU receives a control instruction, the control interfaces YK _ H1 and YK _ L1 respectively output 1 and 0, a forward voltage is applied between an anode (marked with 1) of the optocoupler U1 and a cathode (marked with 2) of the optocoupler U1 through an RC filter circuit which is composed of a film resistor R1 and a ceramic capacitor C1 and used for eliminating disturbance, so that a collector (marked with 4) of the optocoupler U1 is conducted with an emitter (marked with 3) of the optocoupler U6, a +24V remote control power supply is conducted through a rectifying diode D1 which is used for protecting the reverse voltage added by the optocoupler U1, and then the +24V remote control power supply exists between a pin 8 and a pin 1 of the switch-on relay K1, the relay acts, the contact 3 is in short circuit with the contact 4, and the contact 5 is in short circuit with the contact 6, and therefore the switch-on action is controlled. The freewheeling diode D2 prevents a self-inductance voltage during relay operation, thereby improving the interference resistance of the relay.
As a more preferable technical solution, as shown in fig. 6, the opening relay control and operation circuit includes a closing relay K2, a rectifier diode D3, a rectifier diode D5, an optocoupler U2, a thin-film resistor R2, a ceramic capacitor C3, and a ceramic capacitor C4. One end of a film resistor R2 is connected with an MCU control interface IO8 (the label is YK _ H2), and the other end of the film resistor R2 is connected with an anode (the label is 1) of an optocoupler U2 and one end of a ceramic capacitor C3; the other end of the ceramic capacitor C3 is connected with an MCU control interface IO9 (the label is YK _ L2) and a cathode (the label is 2) of an optocoupler U2; a collector (labeled 4) of the optocoupler U2 is connected with a +24V remote control power supply, an emitter (labeled 3) of the optocoupler U2 is connected with an anode of the rectifier diode D3, and two ends of the ceramic capacitor C4 are respectively connected with the collector (labeled 4) of the optocoupler U2 and the emitter (labeled 3) of the optocoupler U2; the cathode of the rectifier diode D3 is connected with one end (marked with 1) of the coil of the closing relay K2 and the cathode of the rectifier diode D5, and the +24V ground is connected with the other end (marked with 8) of the coil of the closing relay K2 and the anode of the rectifier diode D5; contact 3 and contact 6 of closing relay K2 are connected, and contact 4 and contact 5 insert the separating brake switch respectively.
It should be noted that, the detection position and the deployment logic of the conventional power distribution terminal remote control scheme detection system in normal operation are not comprehensive or unreasonable. The traditional method generally comprises the step of adding detection signals on contacts of a switching-on/switching-off relay (such as a contact 3 of a switching-on relay K1 and a contact 3 of a switching-off relay K2) or on a transmitting electrode of a relay control optocoupler, so that the operation state of a detection system is not comprehensive enough, only information of one part of the operation can be sensed, a system cannot be formed, corresponding control logic cannot be fed back, meanwhile, support cannot be provided for locking control of the system, and false operation is likely to be caused in a complex environment. In order to solve the problem, the invention adds corresponding detection point positions and corresponding control logic for locking, thereby greatly improving the reliability and the anti-interference capability. Firstly, a power supply pre-control relay reverse correction circuit (namely an optocoupler U7 and a relevant circuit thereof) is added, so that whether the power supply pre-control relay normally powers on a switching-on/switching-off relay can be detected; according to the invention, the action reverse calibration circuit (namely the optical coupler U8 and related circuits) of the optical coupler of the on/off relay is added, whether the optical coupler of the on/off relay is normally conducted or not can be detected to supply power to the on/off relay, meanwhile, the on/off relay shares the same reverse calibration circuit, which path acts firstly to lock the other path of relay in cooperation with system logic, and the other path of relay does not act, so that the simultaneous action of the on/off relay can be effectively prevented; according to the invention, a switching-on relay action reverse correction circuit (namely an optocoupler U9 and related circuits thereof) is added, so that whether the switching-on/switching-off relay optocoupler action reverse correction circuit works normally can be detected, and whether a switching-on switch acts normally can be detected; the invention adds the action reverse correction circuit (namely the optocoupler U10 and the relevant circuits) of the opening relay, can detect whether the action reverse correction circuit of the optocoupler of the closing/opening relay works normally, and can detect whether the opening switch works normally at the same time. According to the scheme, each link can sense the state from power-on in the remote control system, and meanwhile, the state is strongly coupled with the control logic, so that the reliability and robustness of the system are greatly improved.
As a further preferable technical scheme, the relay reverse calibration circuit includes a power supply pre-control relay reverse calibration circuit, an on/off relay optocoupler action reverse calibration circuit, an on relay action reverse calibration circuit, and an off relay action reverse calibration circuit.
Specifically, as shown in fig. 7 to 10, the power pre-control relay reverse correction circuit includes a rectifier diode D6, a thin film resistor R6, a thin film resistor R7, a ceramic capacitor C8, a ceramic capacitor C9 and an optocoupler U7; the anode of the rectifier diode D6 is connected with a +24V remote control power supply, the cathode of the rectifier diode D6 is connected with one end of a thin-film resistor R7, the other end of the thin-film resistor R7 is connected with a ceramic capacitor C8 and the anode (marked with 1) of an optocoupler U7, and the other end of the ceramic capacitor C8 is connected with the cathode (marked with 2) of the optocoupler U7 and + 24V; the collector (the label is 4) of the optical coupler U7 is connected with one end of a thin film resistor R6, one end of a ceramic capacitor C9 is connected with an MCU interface IO10 (the label is YZFJYX1), the other end of the thin film resistor R6 is connected with +3.3V of a system, and the emitter (the label is 3) of the optical coupler U7 is connected with the other end of the ceramic capacitor C9 and the system ground.
The on-off relay optocoupler action reverse correction circuit comprises a rectifier diode D8, a film resistor R8, a film resistor R9, a ceramic capacitor C11, a ceramic capacitor C12 and an optocoupler U8; the anode of the rectifier diode D8 is connected with both the cathode of the rectifier diode D1 and the cathode of the rectifier diode D3, the cathode of the rectifier diode D8 is connected with one end of a thin-film resistor R9, the other end of the thin-film resistor R9 is connected with a ceramic capacitor C11 and the anode (marked with 1) of an optocoupler U8, and the other end of the ceramic capacitor C11 is connected with the cathode (marked with 2) of an optocoupler U8 and the ground of + 24V; the collector (the label is 4) of the optical coupler U8 is connected with one end of a thin film resistor R8, one end of a ceramic capacitor C12 is connected with an MCU interface IO11 (the label is YZFJYX2), the other end of the thin film resistor R8 is connected with +3.3V of a system, and the emitter (the label is 3) of the optical coupler U8 is connected with the other end of the ceramic capacitor C12 and the system ground.
The switching-on relay action reverse correction circuit comprises a rectifier diode D9, a film resistor R10, a film resistor R11, a ceramic capacitor C13, a ceramic capacitor C14 and an optocoupler U9; the anode of the rectifier diode D9 is connected with the contact 3 of the switch-on relay K1, the cathode of the rectifier diode D9 is connected with one end of the thin-film resistor R11, the other end of the thin-film resistor R11 is connected with the ceramic capacitor C13 and the anode (the label is 1) of the optocoupler U9, and the other end of the ceramic capacitor C13 is connected with the cathode (the label is 2) of the optocoupler U9 and the ground of + 24V; the collector (the label is 4) of the optocoupler U9 is connected with one end of a thin film resistor R10, one end of a ceramic capacitor C14 is connected with an MCU interface IO12 (the label is YZFJYX3), the other end of the thin film resistor R10 is connected with +3.3V of a system, and the emitter (the label is 3) of the optocoupler 9 is connected with the other end of the ceramic capacitor C14 and the system ground.
The action reverse correction circuit of the opening relay comprises a rectifier diode D10, a film resistor R12, a film resistor R13, a ceramic capacitor C15, a ceramic capacitor C16 and an optocoupler U10; the anode of the rectifier diode D10 is connected with the contact 3 of the opening relay K2, the cathode of the rectifier diode D10 is connected with one end of a thin-film resistor R13, the other end of the thin-film resistor R13 is connected with a ceramic capacitor C15 and the anode (the label is 1) of an optocoupler U10, and the other end of the ceramic capacitor C15 is connected with the cathode (the label is 2) of the optocoupler U10 and the ground of + 24V; the collector (the label is 4) of the optical coupler U10 is connected with one end of a thin film resistor R12, one end of a ceramic capacitor C16 is connected with an MCU interface IO13 (the label is YZFJYX4), the other end of the thin film resistor R12 is connected with +3.3V of a system, and the emitter (the label is 3) of the optical coupler U10 is connected with the other end of the ceramic capacitor C16 and the system ground.
As shown in fig. 11, the present embodiment discloses a method for controlling a remote control device of a distribution automation terminal, including the following steps:
(1) initializing a terminal, resetting the state of each control pin of the MCU to an initial state, and outputting a watchdog feeding signal;
(2) reading reverse correction remote signaling signals of each part of the system, judging whether the remote signaling signals are abnormal or not, if not, executing the step (3), if so, reading the remote signaling signals for multiple times, judging whether the remote signaling signals are abnormal or not, if not, executing the step (3), and if so, executing the step (10);
(3) before operation, turning on a power supply pre-control relay;
(4) judging whether the watchdog is normal or not, if so, executing the step (5), and if not, executing the step (10);
(5) judging whether the pre-control relay is normally opened or not through a power supply pre-control relay reverse correction circuit, if so, executing the step (6), if not, judging whether the pre-control relay is abnormal or not for multiple times, if not, executing the step (6), and if so, executing the step (10);
(6) switching on/off the gate, opening a corresponding switching on/off relay, judging whether the watchdog is normal or not, if so, executing the step (7), and if not, executing the step (10);
(7) judging whether the switch-on relay is normally opened and locked according to an optical coupling action reverse correction circuit of the switch-on/switch-off relay, a switch-on relay action reverse correction circuit or a switch-off relay action reverse correction circuit, if so, executing the step (8), if not, judging whether the switch-on relay is abnormal for multiple times, if not, executing the step (8), and if so, executing the step (10);
(8) after the operation is finished, recovering each control state of the MCU, judging whether the watchdog is normal or not, if so, executing the step (9), and if not, executing the step (10);
(9) the system waits for the next operation instruction;
(10) and reporting a fault, initializing a terminal, and resetting the MCU pin.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The remote control device for the distribution automation terminal is characterized by comprising an MCU, wherein a control interface of the MCU is connected with a power supply pre-control relay control and action circuit, a power supply pre-control relay protection circuit, a closing relay control and action circuit, an opening relay control and action circuit and a relay anti-correction circuit.
2. The distribution automation terminal remote control device of claim 1 wherein the power pre-control relay control and action circuit comprises a logic sequence opto-coupler control circuit and a power pre-control relay circuit; the power supply pre-control relay circuit is connected with IO2-IO5 in a control interface of the MCU through a logic sequence optical coupler control circuit.
3. The distribution automation terminal remote control device of claim 2 wherein the logic sequence optocoupler control circuit includes an inverse schmitt trigger U11, an inverse schmitt trigger U12, a two input and gate U4 and a two input and gate U5, the connected MCU and its control interfaces are IO2-IO 5;
a control interface IO2 of the MCU is connected with a second input of the two-input AND gate U4, a control interface IO3 of the MCU is connected with an input of the reverse Schmitt trigger U11, and an output of the reverse Schmitt trigger U11 is connected with a first input of the two-input AND gate U4; a control interface IO4 of the MCU is connected with a second input of the two-input AND gate U5, a control interface IO5 of the MCU is connected with an input of the reverse Schmitt trigger U12, and an output of the reverse Schmitt trigger U12 is connected with a first input of the two-input AND gate U5;
the output of the two-input AND gate U4 is connected with one end of a thin film resistor R5, and the other end of the thin film resistor R5 is connected with the anode of an optocoupler U6 and one end of a ceramic capacitor C10; the output of the two-input and gate U5 is connected with the other end of the ceramic capacitor C10 and with the cathode of the optocoupler U6.
4. The distribution automation terminal remote control device of claim 3 wherein the power source pre-control relay circuit includes an optocoupler U6, a relay K3, and a freewheeling rectifier diode D7; the collector of the optocoupler U6 is connected with a +24V main power supply, the emitter of the optocoupler U6 is connected with a pin 8 of a coil of a power supply pre-control relay K3 and the cathode of a freewheeling rectifier diode D7, a pin 1 of a coil of the power supply pre-control relay K3 is connected with a +24V main power supply reference ground, a contact 3 of the power supply pre-control relay K3 is connected with a contact 6, a contact 4 is connected with the +24V main power supply, and a contact 5 is connected with the +24V remote control power supply.
5. The distribution automation terminal remote control device of claim 1 wherein the power source pre-control relay protection circuit includes a watchdog chip U3, a ceramic capacitor C5, a ceramic capacitor C7, a thin film resistor R3, a thin film resistor R4, and a rectifier diode D4;
an input pin WDI of a watchdog chip U3 is connected with an IO1 of the MCU, an input pin WDI of a watchdog chip U3 is connected with one end of a thin-film resistor R4, a power supply pin VCC of the watchdog chip U3 is respectively connected with +3.3V of the system, the other end of the thin-film resistor R4 and one end of a ceramic capacitor C5, the other end of the ceramic capacitor C5 is connected with the system ground, a ground pin GND of the watchdog chip U3 is connected with the system ground, an output pin/RST of the watchdog chip U3 is respectively connected with a cathode of a rectifier diode D4, one end of a thin-film resistor R3 and one end of the ceramic capacitor C7, the other end of the thin-film resistor R3 is connected with +3.3V of the system, and the other end of the ceramic capacitor C7 is connected with the system ground; the anode of a rectifier diode D4 in the power supply pre-control relay protection circuit is connected with the anode of an optocoupler U6 in the power supply pre-control relay circuit, and the label is JPT.
6. The distribution automation terminal remote control device of claim 1 wherein the closing relay control and action circuit includes a closing relay K1, a rectifier diode D1, a rectifier diode D2, an optocoupler U1, a thin film resistor R1, a ceramic capacitor C1, and a ceramic capacitor C2;
one end of a film resistor R1 is connected with a control interface IO6 of the MCU, the other end of the film resistor R1 is respectively connected with an anode of an optocoupler U1 and one end of a ceramic capacitor C1, the other end of the ceramic capacitor C1 is respectively connected with a control interface IO7 of the MCU and a cathode of the optocoupler U1, a collector of the optocoupler U1 is connected with a +24V remote control power supply, an emitter of the optocoupler U1 is connected with an anode of a rectifier diode D1, and two ends of the ceramic capacitor C2 are respectively connected with a collector of the optocoupler U1 and an emitter of the optocoupler U1;
the cathode of the rectifier diode D1 is connected with one end of the coil of the closing relay K1 and the cathode of the rectifier diode D2 respectively, +24V ground is connected with the other end of the coil of the closing relay K1 and the anode of the rectifier diode D2 respectively, the contact 3 and the contact 6 of the closing relay K1 are connected, and the contact 4 and the contact 5 are connected to a closing switch respectively.
7. The distribution automation terminal remote control device of claim 1 wherein the opening relay control and action circuit includes a closing relay K2, a rectifier diode D3, a rectifier diode D5, an optocoupler U2, a thin film resistor R2, a ceramic capacitor C3 and a ceramic capacitor C4;
one end of a film resistor R2 is connected with a control interface IO8 of the MCU, the other end of the film resistor R2 is respectively connected with an anode of an optocoupler U2 and one end of a ceramic capacitor C3, the other end of the ceramic capacitor C3 is respectively connected with a control interface IO9 of the MCU and a cathode of the optocoupler U2, a collector of the optocoupler U2 is connected with a +24V remote control power supply, an emitter of the optocoupler U2 is connected with an anode of a rectifier diode D3, and two ends of the ceramic capacitor C4 are respectively connected with a collector of the optocoupler U2 and an emitter of the optocoupler U2;
the cathode of the rectifier diode D3 is connected with one end of the coil of the closing relay K2 and the cathode of the rectifier diode D5 respectively, +24V ground is connected with the other end of the coil of the closing relay K2 and the anode of the rectifier diode D5 respectively, the contact 3 and the contact 6 of the closing relay K2 are connected, and the contact 4 and the contact 5 are connected to the opening switch respectively.
8. The distribution automation terminal remote control device according to claim 1, wherein the relay inverse calibration circuit includes a power pre-control relay inverse calibration circuit, an on/off relay optical coupling action inverse calibration circuit, an on relay action inverse calibration circuit, and an off relay action inverse calibration circuit;
the input of the power supply pre-control relay reverse correction circuit is connected with a +24V remote control power supply of the power supply pre-control relay control and action circuit; the input of the on/off relay optical coupling action reverse correction circuit is simultaneously connected with one end of a corresponding on/off relay coil of the on/off relay control and action circuit and the off relay control and action circuit; the input of the closing relay action reverse correction circuit is connected with a closing relay contact 3 of the closing relay control and action circuit; the input of the action reverse correction circuit of the opening relay is connected with the opening relay contact 3 of the control and action circuit of the opening relay.
9. The distribution automation terminal remote control device according to claim 8, wherein the power source pre-control relay reverse calibration circuit, the on/off relay optocoupler action reverse calibration circuit, the on relay action reverse calibration circuit and the off relay action reverse calibration circuit have the same structure and each include a rectifier diode, a first thin film resistor, a second thin film resistor, a first ceramic capacitor, a second ceramic capacitor and an optocoupler; the output of the power supply pre-control relay reverse correction circuit is connected with a control interface IO10 of the MCU; the output of the on/off relay optocoupler action reverse correction circuit is connected with a control interface IO11 of the MCU; the switching-on relay action reverse correction circuit is connected with a control interface IO12 of the MCU; the action reverse correction circuit of the opening relay is connected with a control interface IO13 of the MCU.
10. A control method of the distribution automation terminal remote control device according to any one of claims 1 to 9, characterized by comprising:
(1) initializing a terminal, resetting the state of each control pin of the MCU to an initial state, and outputting a watchdog feeding signal;
(2) reading the anti-correction remote signaling signals of each part of the system, judging whether the remote signaling signals are abnormal or not, if not, executing the step (3), and if so, executing the step (10);
(3) before operation, turning on a power supply pre-control relay;
(4) judging whether the watchdog is normal or not, if so, executing the step (5), and if not, executing the step (10);
(5) judging whether the pre-control relay is normally opened or not through a power supply pre-control relay reverse correction circuit, if so, executing the step (6), and if not, executing the step (10);
(6) switching on/off the gate, opening a corresponding switching on/off relay, judging whether the watchdog is normal or not, if so, executing the step (7), and if not, executing the step (10);
(7) judging whether the opening is normal and the locking is carried out according to an optical coupling action reverse correction circuit of the switching on/off relay, the switching on relay action reverse correction circuit or the switching off relay action reverse correction circuit, if so, executing the step (8), and otherwise, executing the step (10);
(8) after the operation is finished, recovering each control state of the MCU, judging whether the watchdog is normal or not, if so, executing the step (9), and if not, executing the step (10);
(9) the system waits for the next operation instruction;
(10) and reporting a fault, initializing a terminal, and resetting the MCU pin.
CN202110872895.8A 2021-07-30 2021-07-30 Remote control device and control method for power distribution automation terminal Active CN113629866B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110872895.8A CN113629866B (en) 2021-07-30 2021-07-30 Remote control device and control method for power distribution automation terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110872895.8A CN113629866B (en) 2021-07-30 2021-07-30 Remote control device and control method for power distribution automation terminal

Publications (2)

Publication Number Publication Date
CN113629866A true CN113629866A (en) 2021-11-09
CN113629866B CN113629866B (en) 2024-08-30

Family

ID=78381879

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110872895.8A Active CN113629866B (en) 2021-07-30 2021-07-30 Remote control device and control method for power distribution automation terminal

Country Status (1)

Country Link
CN (1) CN113629866B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203104106U (en) * 2012-11-27 2013-07-31 安徽科大智能电网技术有限公司 Remote control module of feed line automation monitoring terminal
CN103779967A (en) * 2014-02-13 2014-05-07 长沙威胜信息技术有限公司 Measuring and controlling system used in distribution automation terminal and measuring and controlling module of measuring and controlling system
CN203774876U (en) * 2014-04-09 2014-08-13 北京合纵科技股份有限公司 Remote control circuit of power distribution automation terminal equipment
CN208874584U (en) * 2018-08-09 2019-05-17 青岛高科软件有限公司 A kind of intelligent network distribution terminal that Bluetooth of mobile phone APP is controllable
CN208969481U (en) * 2018-12-14 2019-06-11 厦门高瑞特电气自动化有限公司 A kind of faulty action preventing control circuit
US20200321774A1 (en) * 2017-12-27 2020-10-08 Shanghai Chenzhu Instrument Co., Ltd. Intelligent safety relay and circuit applied thereby
CN111756112A (en) * 2020-06-29 2020-10-09 河北工业大学 Intelligent low-voltage distribution transformer terminal detection device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203104106U (en) * 2012-11-27 2013-07-31 安徽科大智能电网技术有限公司 Remote control module of feed line automation monitoring terminal
CN103779967A (en) * 2014-02-13 2014-05-07 长沙威胜信息技术有限公司 Measuring and controlling system used in distribution automation terminal and measuring and controlling module of measuring and controlling system
CN203774876U (en) * 2014-04-09 2014-08-13 北京合纵科技股份有限公司 Remote control circuit of power distribution automation terminal equipment
US20200321774A1 (en) * 2017-12-27 2020-10-08 Shanghai Chenzhu Instrument Co., Ltd. Intelligent safety relay and circuit applied thereby
CN208874584U (en) * 2018-08-09 2019-05-17 青岛高科软件有限公司 A kind of intelligent network distribution terminal that Bluetooth of mobile phone APP is controllable
CN208969481U (en) * 2018-12-14 2019-06-11 厦门高瑞特电气自动化有限公司 A kind of faulty action preventing control circuit
CN111756112A (en) * 2020-06-29 2020-10-09 河北工业大学 Intelligent low-voltage distribution transformer terminal detection device

Also Published As

Publication number Publication date
CN113629866B (en) 2024-08-30

Similar Documents

Publication Publication Date Title
CN204578386U (en) Synchronous rectifier controller and semiconductor device
CN105302263A (en) Circuit with automatic power-off restarting function in equipment failure
CN205539381U (en) Under -voltage relay of preventing false retrieval floodgate detection circuitry that opens and shuts
CN205301910U (en) Open power -off control device
CN201994717U (en) Control device for supplying power to breaker control units
CN113629866A (en) Remote control device and control method for distribution automation terminal
CN208445269U (en) A kind of belief system of protective relaying device
CN110474697A (en) Phased array antenna TR component faults monitoring method and system
CN109995004A (en) A kind of residual current acting tripper
CN201146575Y (en) Electron monitoring front end equipment managing machine
CN113094196A (en) Intelligent watchdog device, method and system for preventing communication equipment from crashing
CN109687396B (en) A kind of IGBT short-circuit protection circuit and its implementation
CN114156844B (en) In-situ coincident feeder line automatic protection device with residual voltage locking function
CN116047284A (en) Circuit, method, medium and terminal for detecting opening and closing closed loop of circuit breaker
CN213544754U (en) Relay switch state monitoring circuit and air conditioner
CN110247387B (en) Servo driving module with fault tolerance
CN210604876U (en) Fault detection circuit and equipment
CN115832472A (en) Battery connecting device
CN106200620B (en) A kind of intelligent terminal outputs circuit self checking method and feedback circuit
CN113342151A (en) Watchdog control circuit and control method of relay protection device for preventing startup from being locked
CN102761096A (en) Undervoltage-overvoltage protection device and method
CN217010337U (en) Short-circuit isolation circuit of two buses and short-circuit protection system of two buses
CN112379615B (en) Circuit and method for detecting chip fault of open-loop bus transceiver
CN115201548B (en) Residual voltage detection recording device and method for power distribution terminal
CN111023441A (en) Air conditioner control method and system, storage medium and air conditioner

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant