CN110658780A - PLC control system of circuit breaker secondary circuit - Google Patents
PLC control system of circuit breaker secondary circuit Download PDFInfo
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- CN110658780A CN110658780A CN201910970403.1A CN201910970403A CN110658780A CN 110658780 A CN110658780 A CN 110658780A CN 201910970403 A CN201910970403 A CN 201910970403A CN 110658780 A CN110658780 A CN 110658780A
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- circuit breaker
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1103—Special, intelligent I-O processor, also plc can only access via processor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention provides a PLC control system of a secondary circuit of a circuit breaker, comprising a PLC controller, a control circuit and a detection protection circuit; the control loop is connected with the PLC through a control line; the detection protection circuit is connected with the PLC through a signal line; one end of the control loop is electrically connected with the positive terminal of the power supply through the fuse in series connection, and the other end of the control loop is connected with the negative terminal of the power supply. The trip coil comprises a first end and a second end; the first end of the closing coil is connected to the control switch through a normally closed contact of the breaker; the first end of the tripping coil is connected to the control switch through a normally open contact of the circuit breaker; the control switch is connected to a negative terminal of a power supply through a fuse; the second end of the closing coil is connected with the second end of the tripping coil and then is connected to the positive terminal of the power supply through the fuse; and the control switch and the circuit breaker are respectively connected with the PLC.
Description
Technical Field
The invention relates to the technical field of circuit breaker secondary circuit control, in particular to a PLC control system of a circuit breaker secondary circuit.
Background
The automatic instrument is an automatic technical tool which is composed of a plurality of automatic elements and has more perfect functions. It generally has several functions simultaneously, such as measurement, display, recording or measurement, control, alarm, etc. The automation meter is a system and a subsystem in the whole automation system. An automated meter is an "information machine" whose primary function is the conversion of the form of information, converting an input signal into an output signal. The signal can be expressed in time domain or frequency domain, and the signal can be transmitted in a continuous analog quantity or a discontinuous digital quantity form.
At present, in a factory power supply system, a traditional relay switching value control mode is mostly adopted for control, protection and signal loops of a high-voltage circuit breaker, and the problems of multiple elements, complex wiring, large workload of operation and maintenance, multiple faults, low control automation degree, poor reliability and the like exist. The PLC is used as a substitute product for relay control, has the advantages of high reliability, strong anti-interference capability, simple programming, convenience in maintenance, good environment adaptation and the like, and is a better choice for controlling the secondary circuit of the circuit breaker undoubtedly by utilizing the PLC.
Disclosure of Invention
The invention provides a PLC control system of a secondary circuit of a circuit breaker, aiming at the problems that the traditional relay switching value control mode is adopted for controlling, protecting and signal circuits of a high-voltage circuit breaker in a factory power supply system, and the traditional relay switching value control mode has the defects of more elements, complex wiring, large operation and maintenance workload, more faults, low control automation degree, poor reliability and the like.
The technical scheme of the invention is as follows:
the technical scheme of the invention provides a PLC control system of a secondary circuit of a circuit breaker, which comprises a PLC controller, a control circuit and a detection protection circuit; the control loop is connected with the PLC through a control line;
the detection protection circuit is connected with the PLC through a signal line;
one end of the control loop is electrically connected with the positive terminal of the power supply through the fuse in series connection, and the other end of the control loop is connected with the negative terminal of the power supply.
Furthermore, the control loop comprises a closing coil, a tripping coil, a breaker and a control switch;
the switching-on coil comprises a first end and a second end, and the tripping coil comprises a first end and a second end;
the first end of the closing coil is connected to the control switch through a normally closed contact of the breaker;
the first end of the tripping coil is connected to the control switch through a normally open contact of the circuit breaker; the control switch is connected to a negative terminal of a power supply through a fuse;
the second end of the closing coil is connected with the second end of the tripping coil and then is connected to the positive terminal of the power supply through the fuse; and the control switch and the circuit breaker are respectively connected with the PLC.
Furthermore, the control circuit also comprises an energy storage motor, a first energy storage position switch and a second energy storage position switch;
one end of the energy storage point motor is connected with the positive terminal of the power supply through the fuse, and the other end of the energy storage motor is connected with the negative terminal of the power supply through the button switch;
the first end of the closing coil is connected to the control switch sequentially through the normally closed contact of the circuit breaker and the first energy storage position switch which are connected in series; the first end of the tripping coil is connected to the control switch through a normally open contact of the circuit breaker and the second energy storage position switch which are connected in series in sequence;
and the first energy storage position switch and the second energy storage position switch are respectively connected to the PLC.
Further, the system also comprises an indicating unit and an alarming unit;
and the indicating unit and the alarming unit are respectively connected with the PLC.
Further, the indicating unit comprises a first resistor, a first indicating lamp, a second resistor and a second indicating lamp;
the first resistor and the first indicator lamp are connected in series to form a first indicator circuit, and one end of the first indicator circuit is connected to a connecting point where a normally closed contact of the circuit breaker is connected with the first energy storage position switch; the other end of the first indicating circuit is connected to a negative terminal of a power supply;
the second resistor and the second indicator lamp are connected in series to form a second indicator circuit, and one end of the second indicator circuit is connected to a connecting point where a normally open contact of the circuit breaker is connected with the second energy storage position switch; the other end of the second indicating circuit is connected to the negative terminal of the power supply.
Furthermore, the detection protection circuit comprises a current transformer, a current relay and an intermediate relay;
one end of the current transformer is grounded, the other end of the current transformer is connected to an auxiliary contact of the current relay, and one end of the current relay coil is connected with one end of the intermediate relay coil; the other end of the current relay coil is grounded; the other end of the intermediate relay coil is connected with an auxiliary contact of the current relay; one end of an auxiliary contact of the intermediate relay is connected to a connecting point of a normally open contact of the circuit breaker and the second energy storage position switch, and the other end of the auxiliary contact of the intermediate relay is connected to a negative terminal of the power supply; the auxiliary contact of the intermediate relay is also connected to the PLC controller.
Further, the current transformer comprises a first current transformer and a second current transformer;
the current relay comprises a first current relay and a second current relay;
the intermediate relay comprises a first intermediate relay and a second intermediate relay;
one end of a first current transformer is grounded, the other end of the first current transformer is connected to an auxiliary contact of a first current relay, and one end of a first current relay coil is connected with one end of a first intermediate relay coil; the other end of the first current relay coil is grounded; the other end of the first intermediate relay coil is connected with an auxiliary contact of the first current relay; one end of an auxiliary contact of the first intermediate relay is connected to a connecting point of a normally open contact of the circuit breaker and a second energy storage position switch, and the other end of the auxiliary contact of the first intermediate relay is connected to a negative terminal of a power supply; the auxiliary contact of the first intermediate relay is also connected to the PLC;
one end of a second current transformer is grounded, the other end of the second current transformer is connected to an auxiliary contact of a second current relay, and one end of a second current relay coil is connected with one end of a second intermediate relay coil; the other end of the second current relay coil is grounded; the other end of the second intermediate relay coil is connected with an auxiliary contact of the second current relay; one end of an auxiliary contact of the second intermediate relay is connected to a connecting point of a normally open contact of the circuit breaker and a second energy storage position switch, and a coil of the second intermediate relay is connected with a coil of the first intermediate relay; the other end of the auxiliary contact of the second intermediate relay is connected to a negative terminal of a power supply; the auxiliary contact of the second intermediate relay is also connected to the PLC controller.
Furthermore, the control switch is an LW2 or LW5 type change-over switch, and the contact of the change-over switch has four positions of closing, opening and closing.
Furthermore, the system also comprises an upper computer, wherein the PLC is in communication connection with the upper computer and is used for remotely controlling the secondary circuit of the circuit breaker.
According to the technical scheme, the invention has the following advantages: the system is flexible in structure and easy to expand, and the switching value is controlled to be the characteristic of the system; PID loop control of a continuous process can also be carried out; and can form a complex control system with an upper mechanism, thereby realizing the comprehensive automation of the production process. The system is convenient to use and simple in programming, adopts simple ladder diagrams, logic diagrams or statement tables and other programming languages, and does not need computer knowledge, so that the system development period is short, and field debugging is easy. In addition, the program can be modified online, changing the control scheme without hardware disassembly. The device can adapt to various severe operating environments, has strong anti-interference capability and strong reliability, and is far higher than various other machine types. The PLC controls strong current by weak current, a large amount of control relays are omitted, electric energy is saved, and the operation cost is low; the PLC is convenient to overhaul and maintain, fewer components need to be equipped, the maintenance cost is low, and a large amount of nonferrous metals are saved; the PLC control equipment has small occupied area, low running noise, less heat, less damaged elements and less garbage and is beneficial to the environment; the PLC operation and maintenance needs high professional skills and the like.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a PLC control system connection of a secondary circuit of a circuit breaker according to the present invention.
Fig. 2 is a schematic diagram of PLC controller connections provided by the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, an embodiment of the present invention provides a PLC control system for a secondary circuit of a circuit breaker, including a PLC controller, a control circuit, and a detection protection circuit; the control loop is connected with the PLC through a control line;
the detection protection circuit is connected with the PLC through a signal line;
one end of the control loop is electrically connected with a positive terminal of a power supply through a fuse FU connected in series, and the other end of the control loop is connected with a negative terminal of the power supply.
The control loop comprises a closing coil YO, a tripping coil YR, a breaker QF and a control switch SA;
the closing coil YO comprises a first end and a second end, and the tripping coil YR comprises a first end and a second end;
the first end of the closing coil YO is connected to a control switch SA3-4 through a normally closed contact QF1-2 of the circuit breaker;
the first end of the tripping coil YR is connected to a control switch SA1-2 through a normally open contact QF3-4 of the circuit breaker; the control switch is connected to the negative terminal of the power supply through the fuse FU;
the second end of the closing coil YO is connected with the second end of the tripping coil YR and then is connected to the positive terminal of the power supply through the fuse FU; and the control switch SA and the breaker QF are respectively connected with the PLC.
The control circuit also comprises an energy storage motor M, an energy storage position switch SQ1 and an energy storage position switch SQ 2;
one end of an energy storage motor M is connected with the positive terminal of a power supply through a fuse FU, and the other end of the energy storage motor M is connected with the negative terminal of the power supply through a button switch SB;
the first end of the closing coil YO is connected to a control switch SA3-4 through a normally closed contact QF1-2 and an energy storage position switch SQ1 of the circuit breaker which are connected in series in sequence; the first end of the tripping coil YR is connected to the control switch SA1-2 through a normally open contact QF3-4 and an energy storage position switch SQ2 of the circuit breaker which are connected in series in sequence;
and the energy storage position switch SQ1 and the energy storage position switch SQ2 are respectively connected to a PLC controller.
The system also comprises an indicating unit and an alarming unit;
and the indicating unit and the alarming unit are respectively connected with the PLC.
The indicating unit comprises two resistors R, an indicating lamp GN and an indicating lamp RD;
one resistor R is connected with an indicator light GN in series to form an indicator circuit, and one end of the indicator circuit is connected to a connecting point where a normally closed contact QF1-2 of the circuit breaker and an energy storage position switch SA3-4 are connected; the other end of the indicating circuit is connected to a negative terminal of a power supply;
the other resistor R is connected with the indicator lamp RD in series to form an indicator circuit, and one end of the indicator circuit is connected to a connection point where a normally open contact QF3-4 and an energy storage position switch SA1-2 of the circuit breaker are connected; the other end of the indicating circuit is connected to the negative terminal of the power supply.
The detection protection loop comprises a current transformer TA1, a current transformer TA2, a current relay KA1, a current relay KA2, an intermediate relay KM1 and an intermediate relay KM 2;
one end of a current transformer TA1 is grounded, the other end of the current transformer TA1 is connected to an auxiliary contact of a current relay KA1, and one end of a coil of the current relay KA1 is connected with one end of a coil of an intermediate relay KM 1; the other end of the coil of the current relay KA1 is grounded; the other end of the coil of the intermediate relay KM1 is connected with an auxiliary contact of a current relay KA 1; one end of an auxiliary contact of the intermediate relay KM1 is connected to a connection point where a normally open contact QF3-4 of a circuit breaker is connected with an energy storage position switch SQ2, and the other end of the auxiliary contact of the intermediate relay KM1 is connected to a negative terminal of a power supply; the auxiliary contact of the intermediate relay KM1 is also connected to a PLC controller;
one end of a current transformer TA2 is grounded, the other end of the current transformer TA2 is connected to an auxiliary contact of a current relay KA2, and one end of a coil of the current relay KA2 is connected with one end of a coil of an intermediate relay KM 2; the other end of the coil of the current relay KA2 is grounded; the other end of the coil of the intermediate relay KM2 is connected with an auxiliary contact of a current relay KA 2; one end of an auxiliary contact of the intermediate relay KM2 is connected to a connection point where a normally open contact QF3-4 of the circuit breaker is connected with an energy storage position switch SQ2, and a coil of the intermediate relay KM2 is connected with a coil of the intermediate relay KM 1; the other end of the auxiliary contact of the intermediate relay KM2 is connected to the negative terminal of the power supply; the auxiliary contact of the intermediate relay KM2 was also connected to the PLC controller. The connection diagram of the PLC is shown in fig. 2.
The control switch is an LW2 or LW5 type change-over switch, and the contact of the change-over switch has four positions of closing, opening and opening.
The system further comprises an upper computer, wherein the PLC is in communication connection with the upper computer and is used for remotely controlling the secondary circuit of the circuit breaker.
It should be noted that RD is a red indicator light, GN is a3-4 contact of a green indicator light SA, which is only switched on when switching on, and is switched off after switching on; the 1-2 contact of the SA is switched on only during switching off and is switched off after switching off; SQ1 and SQ2 are position switches of the spring energy storage motor and are in an initial state when the energy is not stored.
When needing closing a floodgate operation, must carry out the spring energy storage earlier: when the SB button is pressed, X4 is 1, Y3 is Y4 is 1, GN green light is on, the energy storage motor M is energized to store energy in the closing spring, and after completion of closing, the normally open contacts SQ1 and SQ2 are closed, Y3 is 0, and the motor M stops rotating, and the GN light remains on because it is still in the open position.
When the switch is closed, the SA is switched to the switching-on position, the normally open contact is turned on, X1 is equal to 1, Y1 is equal to Y4 is equal to 1, a large current flows through the switching-on coil YO, the operating mechanism closes the QF breaker, and after the switch is closed, the normally open auxiliary contact of QF turns Y5 to 1, and the RD red light is turned on.
When the gate is opened, the SA is pulled to the opening position, the normally open contact is opened, X1 is 0, X3 is 1, Y2 is Y5 is 1, the opening coil YR passes through larger current, the operating mechanism enables the QF circuit breaker to be opened, the opening is not completed, the RD red lamp is still turned on, and the GN green lamp is turned on after the opening.
When a primary circuit is short-circuited, a KM1 coil or a KM2 coil is electrified, a normally open contact of the coil is closed, X6 is equal to X7 and equal to 1, Y2 is equal to Y6 and equal to 1, YR is enabled to pass through a large current to trip a QF breaker, and an accident signal is sent to inform a watchman to pull SA to a separating brake position and remove the accident signal because QF is an accident trip.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A PLC control system of a secondary circuit of a circuit breaker is characterized by comprising a PLC controller, a control circuit and a detection protection circuit; the control loop is connected with the PLC through a control line;
the detection protection circuit is connected with the PLC through a signal line;
one end of the control loop is electrically connected with the positive terminal of the power supply through the fuse in series connection, and the other end of the control loop is connected with the negative terminal of the power supply.
2. The PLC control system of a secondary circuit of a circuit breaker according to claim 1, wherein the control circuit includes a closing coil, a trip coil, a circuit breaker, a control switch;
the switching-on coil comprises a first end and a second end, and the tripping coil comprises a first end and a second end;
the first end of the closing coil is connected to the control switch through a normally closed contact of the breaker;
the first end of the tripping coil is connected to the control switch through a normally open contact of the circuit breaker; the control switch is connected to a negative terminal of a power supply through a fuse;
the second end of the closing coil is connected with the second end of the tripping coil and then is connected to the positive terminal of the power supply through the fuse; and the control switch and the circuit breaker are respectively connected with the PLC.
3. The PLC control system of a secondary circuit of a circuit breaker according to claim 2, wherein the control circuit further comprises a stored energy motor, a first stored energy position switch and a second stored energy position switch;
one end of the energy storage point motor is connected with the positive terminal of the power supply through the fuse, and the other end of the energy storage motor is connected with the negative terminal of the power supply through the button switch;
the first end of the closing coil is connected to the control switch sequentially through the normally closed contact of the circuit breaker and the first energy storage position switch which are connected in series; the first end of the tripping coil is connected to the control switch through a normally open contact of the circuit breaker and the second energy storage position switch which are connected in series in sequence;
and the first energy storage position switch and the second energy storage position switch are respectively connected to the PLC.
4. The PLC control system of the secondary circuit of the circuit breaker according to claim 1, wherein the system further comprises an indicating unit and an alarming unit;
and the indicating unit and the alarming unit are respectively connected with the PLC.
5. The PLC control system of a secondary circuit breaker according to claim 4, wherein the indicating unit comprises a first resistor, a first indicating lamp, a second resistor and a second indicating lamp;
the first resistor and the first indicator lamp are connected in series to form a first indicator circuit, and one end of the first indicator circuit is connected to a connecting point where a normally closed contact of the circuit breaker is connected with the first energy storage position switch; the other end of the first indicating circuit is connected to a negative terminal of a power supply;
the second resistor and the second indicator lamp are connected in series to form a second indicator circuit, and one end of the second indicator circuit is connected to a connecting point where a normally open contact of the circuit breaker is connected with the second energy storage position switch; the other end of the second indicating circuit is connected to the negative terminal of the power supply.
6. The PLC control system of a secondary circuit of a circuit breaker according to claim 3, wherein the detection protection circuit comprises a current transformer, a current relay and an intermediate relay;
one end of the current transformer is grounded, the other end of the current transformer is connected to an auxiliary contact of the current relay, and one end of the current relay coil is connected with one end of the intermediate relay coil; the other end of the current relay coil is grounded; the other end of the intermediate relay coil is connected with an auxiliary contact of the current relay; one end of an auxiliary contact of the intermediate relay is connected to a connecting point of a normally open contact of the circuit breaker and the second energy storage position switch, and the other end of the auxiliary contact of the intermediate relay is connected to a negative terminal of the power supply; the auxiliary contact of the intermediate relay is also connected to the PLC controller.
7. The PLC control system of a secondary circuit breaker according to claim 6, wherein the current transformers comprise a first current transformer and a second current transformer;
the current relay comprises a first current relay and a second current relay;
the intermediate relay comprises a first intermediate relay and a second intermediate relay;
one end of a first current transformer is grounded, the other end of the first current transformer is connected to an auxiliary contact of a first current relay, and one end of a first current relay coil is connected with one end of a first intermediate relay coil; the other end of the first current relay coil is grounded; the other end of the first intermediate relay coil is connected with an auxiliary contact of the first current relay; one end of an auxiliary contact of the first intermediate relay is connected to a connecting point of a normally open contact of the circuit breaker and a second energy storage position switch, and the other end of the auxiliary contact of the first intermediate relay is connected to a negative terminal of a power supply; the auxiliary contact of the first intermediate relay is also connected to the PLC;
one end of a second current transformer is grounded, the other end of the second current transformer is connected to an auxiliary contact of a second current relay, and one end of a second current relay coil is connected with one end of a second intermediate relay coil; the other end of the second current relay coil is grounded; the other end of the second intermediate relay coil is connected with an auxiliary contact of the second current relay; one end of an auxiliary contact of the second intermediate relay is connected to a connecting point of a normally open contact of the circuit breaker and a second energy storage position switch, and a coil of the second intermediate relay is connected with a coil of the first intermediate relay; the other end of the auxiliary contact of the second intermediate relay is connected to a negative terminal of a power supply; the auxiliary contact of the second intermediate relay is also connected to the PLC controller.
8. The PLC control system of a secondary circuit of a circuit breaker according to claim 2, wherein the control switch is a LW2 or LW5 type transfer switch, and a contact of the transfer switch has four positions of closing, opening and opening.
9. The PLC control system of the secondary circuit of the circuit breaker according to claim 1, further comprising an upper computer, wherein the PLC controller is in communication connection with the upper computer and is used for remotely controlling the secondary circuit of the circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910970403.1A CN110658780A (en) | 2019-10-13 | 2019-10-13 | PLC control system of circuit breaker secondary circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910970403.1A CN110658780A (en) | 2019-10-13 | 2019-10-13 | PLC control system of circuit breaker secondary circuit |
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| CN110658780A true CN110658780A (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910970403.1A Pending CN110658780A (en) | 2019-10-13 | 2019-10-13 | PLC control system of circuit breaker secondary circuit |
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| CN111965461A (en) * | 2020-08-24 | 2020-11-20 | 华能山东发电有限公司烟台发电厂 | Multifunctional analog circuit breaker |
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Application publication date: 20200107 |
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