CN111965461B - Multifunctional analog circuit breaker - Google Patents
Multifunctional analog circuit breaker Download PDFInfo
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- CN111965461B CN111965461B CN202010856776.9A CN202010856776A CN111965461B CN 111965461 B CN111965461 B CN 111965461B CN 202010856776 A CN202010856776 A CN 202010856776A CN 111965461 B CN111965461 B CN 111965461B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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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
Abstract
The invention discloses a multifunctional analog circuit breaker, which comprises a PLC and an input switch; the input switch is connected with the input end of the PLC and comprises a manual closing switch and a manual tripping switch; the output end of the PLC is used for connecting an external loop, and the on-off control and state indication functions of the external loop are realized; and the PLC is internally integrated with a control program for simulating the control function of the circuit breaker. The invention realizes the functions of the circuit breaker by utilizing the PLC programming, has simple structure, small volume, convenient connection and low cost, can conveniently expand by modifying programs and adding ports and switches, and simultaneously simulates a plurality of circuit breakers and realizes the advanced functions of self-defining opening and closing time, jump prevention, simulated failure and the like.
Description
Technical Field
The present invention relates to an analog circuit breaker.
Background
In the verification process of the relay protection and safety automatic device, an analog breaker is required to replace an actual breaker, the adverse effect generated by repeatedly switching on and off the actual breaker is eliminated, the phenomenon that the actual breaker cannot power failure and cannot drive the system is avoided, meanwhile, the working efficiency is improved, and the overhaul period is shortened.
There are two main types of analog circuit breakers in use today. The relay control is adopted, the functions of the relay control are too simple, and only the functions of opening and closing and position indication are adopted; the control logic is formed by utilizing series connection or parallel connection of mechanical contacts of the relay, hysteresis action of a delay relay and the like, and the relay has the advantages of more and complex connection lines and high power consumption; and once the product is formed, the function is difficult to change, the flexibility and expansibility are poor, and the field requirement cannot be met. The other type adopts MCU module control, and is high in cost and weak in anti-interference capability, and when the product is abnormal, an operator cannot find the reason and repair the reason independently.
Disclosure of Invention
The invention provides a multifunctional analog circuit breaker, which aims to: (1) simplifying the structure and wiring of an analog circuit breaker; (2) improved flexibility and extensibility; (3) reducing cost; (4) The high-level functions of self-defining opening and closing time, jump prevention, simulated failure and the like are realized.
The technical scheme of the invention is as follows:
a multifunctional analog circuit breaker comprises a PLC and an input switch;
the input switch is connected with the input end of the PLC and comprises a self-resetting manual closing switch and a self-resetting manual tripping switch;
the output end of the PLC is used for connecting an external loop, so that the on-off control of the external loop is realized, and the state indication function is realized by the external loop;
and the PLC is internally integrated with a control program for simulating the control function of the circuit breaker.
As a further improvement of the device: the PLC internal control program simulates the control function of the circuit breaker by the following modes:
setting intermediate relays KM3, KM4, HQ, TQ and DL;
setting a manual closing loop, wherein a self-resetting manual closing switch SB1 is connected with a relay KM4 in series;
setting a starting closing loop, wherein in the loop, a normally open contact controlled by a relay KM4 is connected in parallel with a normally open contact controlled by a relay HQ, and then is connected in series with a normally closed contact controlled by a relay DL and the relay HQ, wherein the relay HQ is used for sending a closing instruction to the relay DL, and then is connected with an external loop through the output end of a PLC to realize a closing function;
setting a manual tripping circuit, wherein a self-resetting manual tripping switch SB2 is connected with a relay KM3 in series;
the tripping circuit is set, in the tripping circuit, after the normally open contact controlled by the relay KM3 is connected in parallel with the normally open contact controlled by the relay TQ, the normally open contact controlled by the relay DL and the relay TQ are connected in series, and the relay TQ is used for sending a tripping instruction to the relay DL and then is connected with an external circuit through the output end of the PLC so as to realize the tripping function.
As a further improvement of the device: the input switch further comprises a closing delay selection switch SA1 and a separating delay selection switch SA2;
the PLC is also internally provided with a closing delay loop, a separating brake delay loop and a separating and closing control loop;
in the switching-on delay loop, normally open contacts controlled by the relay HQ are respectively connected with a plurality of switching-on time relays through SA 1;
in the switching-off delay loop, normally open contacts controlled by a relay TQ are respectively connected with a plurality of switching-off time relays through SA2;
in the switching-on/off control loop, the delay closing contact controlled by each switching-on time relay is connected in parallel with the normally open contact controlled by the relay DL, then is connected in series with the delay opening contact controlled by all switching-off time relays and the relay DL, and after any switching-on time relay finishes timing, the relay DL is electrified and self-locking is realized, and after any switching-off time relay finishes timing, the relay DL is powered off.
As a further improvement of the device: the input switch further comprises a debugging closing switch SB3 and a debugging opening switch SB4;
in the starting switching-on loop, a normally open contact controlled by the relay KM4 is also connected with the debugging switching-on switch SB3 in parallel;
in the starting tripping circuit, a normally open contact controlled by the relay KM3 is also connected in parallel with the debugging breaking switch SB 4.
As a further improvement of the device: intermediate relays TBJI and TBJV are arranged in the PLC;
in the start trip circuit, relay TBJI is connected in parallel with relay TQ;
a first branch, a second branch and a third branch are arranged in the starting and closing loop;
the normally open contact controlled by the parallel relay KM4 and the normally open contact controlled by the relay HQ form a first branch;
the normally closed contact controlled by the relay DL connected in series and the relay HQ part form a second branch; the normally closed contact controlled by the relay TBJV is also connected in series in the second branch;
in the third branch, a normally open contact controlled by the relay TBJV is sequentially connected with the relay TBJV in series from left to right;
the second branch is connected in parallel with the third branch and then connected in series with the right end of the first branch;
the left end of the normally open contact controlled by the relay TBJI is connected with the left end of the first branch, and the right end of the normally open contact controlled by the relay TBJV is connected with the right end of the normally open contact.
As a further improvement of the device: the input switch further comprises a breaker anti-tripping change-over switch S1; in the second branch, the breaker anti-tripping switch S1 is connected in parallel with a normally closed contact controlled by the relay TBJV and is used for controlling the input anti-tripping function or the taking of the fire-fighting tripping function.
As a further improvement of the device: the input switch further comprises a breaker failure analog switch SA;
in a PLC program, a breaker failure control loop and an intermediate relay KM1 are arranged, wherein a breaker failure analog switch SA is connected with the relay KM1 in series;
in the starting trip circuit, a normally closed contact controlled by the relay KM1 is connected in series with a normally open contact controlled by the relay DL and the relay TQ, and when the breaker failure analog switch SA is set to be in a failure state, the relay KM1 controls the relay TQ to be incapable of obtaining electricity.
As a further improvement of the device: the intermediate relay DL is also connected with an external relay ZJ through the output end of the PLC, and a contact controlled by the relay ZJ is connected with the protection device and the position indicator for checking and indicating the position of the circuit breaker by the protection device.
As a further improvement of the device: the PLC is also provided with a manual closing signal loop, the loop comprises an intermediate relay KM2, and the self-resetting manual closing switch SB1 is connected in parallel with a normally-open contact controlled by the relay KM2 and then connected in series with a normally-closed contact controlled by the relay KM3 and the relay KM 2;
the intermediate relay KM2 is also connected with an external relay SHJ through a PLC output end, and a contact controlled by the relay SHJ is connected with a protection device and an indicator lamp and used for checking the protection device and indicating a manual closing state.
Compared with the prior art, the invention has the following beneficial effects: (1) The invention realizes the functions of the circuit breaker by utilizing the PLC programming, has simple structure, small volume, convenient connection and low cost, can conveniently expand by modifying the program and adding ports and switches, and simultaneously simulates a plurality of circuit breakers; (2) The built-in intermediate relay realizes the advanced functions of self-defining opening and closing time, jump prevention, simulated failure and the like, and is convenient for test and maintenance.
Drawings
Fig. 1 is a schematic diagram of the connection between a PLC and an external relay, input switch and indicating device.
FIG. 2 is a first portion of a schematic diagram of PLC control.
FIG. 3 is a second part of the PLC control schematic.
FIG. 4 is a third portion of the PLC control schematic.
FIG. 5 is a fourth section of the PLC control schematic.
FIG. 6 is a fifth portion of the PLC control schematic.
Correspondence between main ports and modules in the control schematic in fig. 1:
i0.0 and I1.3 are respectively corresponding to SB1 switches of the two simulated circuit breakers and are used for realizing a manual closing function;
i0.1 and I1.4 are respectively corresponding to SB3 switches of the two simulated circuit breakers and are used for realizing the function of debugging and closing;
i0.2 and I1.5 are respectively corresponding to SB2 switches of the two simulated circuit breakers and are used for realizing a manual tripping function;
i0.3 and I1.6 are respectively corresponding to SB4 switches of the two simulated circuit breakers and are used for realizing the debugging and opening functions;
i0.4 and I1.7 respectively correspond to SA switches of the two simulated circuit breakers and are used for realizing a failure simulation function;
I0.5-I0.7 and I2.0-I2.2 are respectively corresponding to SA1 switches of the two simulated circuit breakers and are used for realizing a self-defined delay closing function;
I1.0-I1.2 and I2.3-I2.5 respectively correspond to SA2 switches of the two simulated circuit breakers and are used for realizing a self-defined delay switching-off function;
and I2.7 corresponds to S1 and is used for realizing the function of 'circuit breaker anti-tripping selection'.
ZJ1 and ZJ2 connected with Q0.0 and Q1.0 are MY4NJ type relays, respectively correspond to DL relays of two circuit breakers, are used for displaying the positions of the circuit breakers, and output normally open normally closed contacts ZJ1 and ZJ2 to provide circuit breaker position contacts for device verification;
and the SHJ1 and SHJ2 connected with the Q0.2 and the Q1.2 are MY2NJ type relays, the KM2 relays respectively correspond to the two circuit breakers, whether the circuit breakers are manually closed or not is indicated through the HD1 indicator lamp and the HD2 indicator lamp, normally open contacts of the SHJ1 and the SHJ2 are output, and the manual closing contacts of the circuit breakers are provided for device verification.
Detailed Description
1. The technical scheme of the invention is described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the analog circuit breaker uses a PLC as a core, and selects a change-over switch, a button and an opening and closing instruction of a protection device as digital input quantities; an ohm dragon relay with rated voltage of 24V is selected as a heavy-duty relay of the digital quantity output module so as to provide a required contact.
The following describes a specific embodiment of the present analog circuit breaker with reference to the control loops of fig. 2 to 6:
(1) The circuit breaker closing and hand closing loop are simulated.
From fig. 2 to 6, the relays of the self-resetting manual closing switches SB1, KM2, KM4 are simultaneously electrified. After the KM2 relay is electrified, the relay is self-held through a self-normally-open contact, a hand-in signal is always output, and a status lamp is lightened through the SHJ 1. KM4 drives the HQ relay to be electrified (the external switch-in "test-on" SB3 is also switched on), the HQ relay is self-maintained until the relay DL is electrified, the loop is disconnected by the DL normally-closed contact, the HQ relay is powered off and returns, and the breaker is switched on. After the DL relay is electrified and self-maintained, the DL normally-open contact is used for reactivating the ZJ1 relay, displaying the position of the analog circuit breaker and sending out the position contact of the analog circuit breaker.
(2) And simulating the design of a breaking loop of the circuit breaker.
The automatic reset manual tripping switch SB2 and KM3 are pressed to electrify the relay, the relay TQ of the breaker is electrified in the electrified state of the relay DL (the external switch-in debugging branch SB4 is also switched on), the relay TQ is self-maintained until the normally open contact of the relay DL is restored to the off state after the relay DL is deenergized, and the relay TQ is deenergized and returned to complete the tripping of the breaker.
(3) And (5) simulating the switching-on and switching-off time setting of the circuit breaker.
According to the switching-on and switching-off time of the actual breaker, the simulated breaker respectively sets three different tripping times and three different switching-on times through 6 time relays, as shown in the following table 1. The tripping and closing time can be combined pairwise, and the switching characteristics of different actual circuit breakers can be widely simulated.
TABLE 1 analog breaker time selection
When the HQ or TQ relay acts, the corresponding normally open contact is closed, different contacts are conducted according to different positions of the switching-on/off time change-over switch, different time relays can be started respectively, after preset delay, the corresponding contacts of the time relay are closed or opened in a delayed manner, so that the DL relay acts or returns after preset delay, and the simulated circuit breaker has different switching-on/off time functions.
(4) And simulating the design of the circuit breaker anti-jump loop.
In order to prevent the contact adhesion of a closing circuit and cause repeated opening and closing of the analog circuit breaker in a fault state, the analog circuit breaker is designed to prevent a tripping circuit according to the actual circuit breaker function.
When the contact of the self-resetting manual tripping switch SB2 or the debugging branch SB4 is switched on, a TBJI relay is started while a TQ relay is started, and a normally open contact of the TBJI relay starts a TBJV relay in a closing loop; if the 'test on' SB3 contact is stuck or the KM4 normally open contact is always closed in the closing loop at the moment, the TBJV relay is started, and the normally open contact controlled by the TBJV relay is closed, so that the self-holding of the TBJV relay is realized. The normally closed contact of the TBJV relay acts and breaks the closing loop, so that the relay HQ cannot be electrified, and the anti-tripping function is realized.
If the anti-tripping function of the breaker is not expected to be used during verification, the transfer switch S1 can be selected to cancel the mode breaking anti-tripping function, at the moment, the contact of the transfer switch S1 is closed, the normally closed contact of the TBJV is short-circuited, and the anti-tripping function is shielded.
(5) Simulation breaker characteristics selection.
The circuit breaker in practical application has the problem of failure rejection. In order to verify the action of the spare power automatic switching device when the working power circuit breaker fails and the action of the quick switching device in a series mode, the failure protection action logic of the protection device is verified (corresponding logic judgment is made according to the failure characteristics of the circuit breaker, and the outlet acts on other circuit breakers). The simulated circuit breaker is provided with the circuit breaker characteristic selection switch, when the change-over switch SA selects the normal state of the circuit breaker, the coil of the relay KM1 is not electrified, and a tripping circuit is not affected. When the switching handle SA selects 'breaker failure', the KM1 coil is started, and the normally-closed contact is disconnected, so that the relay TQ can not be powered all the time and can not send a tripping signal, and the breaker failure function is realized.
In this embodiment, two circuit breakers are co-simulated. By expanding the input and output ports and copying the program, the multi-circuit breaker can be simulated.
And 2, simulation debugging of the PLC program:
according to the designed control diagram, an operation program is written by STEP 7V 5.6 software, and an S7-PLCSIM V5.4 SP5 simulator is used for simulating the action behavior of the circuit breaker by taking the circuit breaker 1 as an example (hereinafter referred to as the circuit breaker 1).
The multiple output definitions are set during simulation (two of them can meet the requirements in practical application).
Inputting a manual closing instruction, closing the circuit breaker 1, and outputting the closing position and the manual closing contact point of the circuit breaker 1; the "trial-and-closing" instruction is input, and the breaker 1 is closed but does not output a hand-closing contact.
After the breaker 1 is manually closed, if a manual tripping instruction is input, the breaker 1 trips and a manual contact returns; if the "debug break" command is entered, the breaker 1 trips, but the hand-in contact does not return.
The analog circuit breaker defaults to use the self anti-jump function, when the 'switching mode breaking anti-jump' is selected and a manual closing and manual tripping instruction is input at the same time, the circuit breaker 1 outputs a split position, a manual closing point returns, and the jumping phenomenon does not occur. If "cancel mode break jump prevention" is selected, the circuit breaker 1 will jump.
The breaker 1 is closed by hand, and after the breaker failure is input, the breaker is tripped by hand, the breaker 1 is not opened, and the closing position and the breaker failure contact point are output.
In conclusion, the output signal of the PLC output module is consistent with theoretical analysis, and the expected function of the analog circuit breaker can be realized. Because the passive contact is provided for the outside, the external output contact of the intermediate relay is externally connected with Q0.0 and Q0.2 respectively. If the contacts need to be expanded, relays can be correspondingly added.
3. Field instance application:
the simulation breaker is debugged and verified by using a PCS-9651D standby power supply automatic switching device used on site. And (3) downloading a simulation error-free program into the S7-300 PLC, powering up the PLC, and using the button to manually trip the breaker, wherein the PLC and the indicator lamp display no abnormality. The automatic switching mode 1 in the PCS-9651D is checked by using the analog circuit breaker.
The tripping position and the hand-on position contacts of the analog circuit breaker 1 and the analog circuit breaker 2 are respectively connected into corresponding tripping positions and hand-on contacts of a power supply 1 and a power supply 2 in an opening plate of the PCS-9651D device, and the outlet contacts of the tripping circuit breaker used by the device are connected into opening and closing instructions of the analog circuit breakers 1 and 2. That is, the analog circuit breaker 1 is defined as a power supply 1, and the analog circuit breaker 2 is defined as a power supply 2, which will be hereinafter referred to as power supply 1, power supply 2. The power supply 1 is manually turned on, so that the power supply 1 is in the on-position, and the power supply 2 is in the off-position.
Table 2 sets for relevant constants.
Table 2-automatic switching value notification sheet
According to the device specification, after the automatic switching device is charged, when the bus voltage is lower than a 'no-voltage starting fixed value' and the standby power supply is under voltage, the device is started, the power supply 1 switch is tripped through a 'mode 1 tripping delay', after the power supply 1 switch is determined to be tripped, and when the bus voltage is lower than a 'no-voltage pressing brake fixed value', a switching-on command of the power supply 2 is sent through a 'mode 12 switching-on short delay'.
And (3) using a relay protection tester to introduce bus three-phase voltage and standby power supply voltage into the PCS-9651D standby automatic switching device. In order to facilitate action time sequence analysis, after the device is charged, the three-phase voltage of the bus is directly suddenly reduced to be less than 0.95 times of a fixed value of a non-pressing brake, and the device completes the power jump 1 and the power supply 2. Adjusting the tripping time of the power supply 1 switch, recording the closing time of the power supply 2 under different tripping time of the power supply 1 switch, and as shown in the table 3:
TABLE 3 device Power supply 2 time
After the action time test of the reclosing relay is carried out, the simulated breaker can carry out switching-on/off time correction, and the re-correction program is downloaded to the S7-300 PLC CPU module so as to improve the time accuracy.
From the above, the analog circuit breaker can be used as a substitute product of an actual circuit breaker, has the advantages of simple wiring, strong expandability, good flexibility, easy operation and maintenance, stable and reliable operation, meets the verification requirement of a protection device, can make up the defects of the existing analog circuit breaker, reduces the damage to the actual circuit breaker, improves the maintenance efficiency, reduces the maintenance cost and improves the operation reliability of an electric power system.
Claims (6)
1. A multifunctional analog circuit breaker, characterized by: comprises a PLC and an input switch;
the input switch is connected with the input end of the PLC and comprises a self-resetting manual closing switch and a self-resetting manual tripping switch;
the output end of the PLC is used for connecting an external loop, so that the on-off control of the external loop is realized, and the state indication function is realized by the external loop;
the PLC is internally integrated with a control program for simulating the control function of the circuit breaker;
the PLC internal control program simulates the control function of the circuit breaker by the following modes:
setting intermediate relays KM3, KM4, HQ, TQ and DL;
setting a manual closing loop, wherein a self-resetting manual closing switch SB1 is connected with a relay KM4 in series;
setting a starting closing loop, wherein in the loop, a normally open contact controlled by a relay KM4 is connected in parallel with a normally open contact controlled by a relay HQ, and then is connected in series with a normally closed contact controlled by a relay DL and the relay HQ, wherein the relay HQ is used for sending a closing instruction to the relay DL, and then is connected with an external loop through the output end of a PLC to realize a closing function;
setting a manual tripping circuit, wherein a self-resetting manual tripping switch SB2 is connected with a relay KM3 in series;
setting a starting tripping circuit, wherein in the circuit, a normally open contact controlled by a relay KM3 is connected in parallel with a normally open contact controlled by a relay TQ, and then is connected in series with a normally open contact controlled by a relay DL and the relay TQ, and the relay TQ is used for sending a tripping instruction to the relay DL and then is connected with an external circuit through the output end of a PLC (programmable logic controller) to realize a tripping function;
intermediate relays TBJI and TBJV are arranged in the PLC;
in the start trip circuit, relay TBJI is connected in parallel with relay TQ;
a first branch, a second branch and a third branch are arranged in the starting and closing loop;
the normally open contact controlled by the relay KM4 and the normally open contact controlled by the relay HQ connected in parallel form a first branch;
the normally closed contact controlled by the relay DL connected in series and the relay HQ part form a second branch; the normally closed contact controlled by the relay TBJV is also connected in series in the second branch;
in the third branch, a normally open contact controlled by the relay TBJV is sequentially connected with the relay TBJV in series from left to right;
the second branch is connected in parallel with the third branch and then connected in series with the right end of the first branch;
the left end of the normally open contact controlled by the relay TBJI is connected with the left end of the first branch, and the right end of the normally open contact controlled by the relay TBJV is connected with the right end of the normally open contact;
the input switch further comprises a breaker anti-tripping change-over switch S1; in the second branch, the breaker anti-tripping switch S1 is connected in parallel with a normally closed contact controlled by the relay TBJV and is used for controlling the input anti-tripping function or the taking of the fire-fighting tripping function.
2. The multifunction analog circuit breaker of claim 1, wherein: the input switch further comprises a closing delay selection switch SA1 and a separating delay selection switch SA2;
the PLC is also internally provided with a closing delay loop, a separating brake delay loop and a separating and closing control loop;
in the switching-on delay loop, normally open contacts controlled by the relay HQ are respectively connected with a plurality of switching-on time relays through SA 1;
in the switching-off delay loop, normally open contacts controlled by a relay TQ are respectively connected with a plurality of switching-off time relays through SA2;
in the switching-on/off control loop, the delay closing contact controlled by each switching-on time relay is connected in parallel with the normally open contact controlled by the relay DL, then is connected in series with the delay opening contact controlled by all switching-off time relays and the relay DL, and after any switching-on time relay finishes timing, the relay DL is electrified and self-locking is realized, and after any switching-off time relay finishes timing, the relay DL is powered off.
3. The multifunction analog circuit breaker of claim 1, wherein: the input switch further comprises a debugging closing switch SB3 and a debugging opening switch SB4;
in the starting switching-on loop, a normally open contact controlled by the relay KM4 is also connected with the debugging switching-on switch SB3 in parallel;
in the starting tripping circuit, a normally open contact controlled by the relay KM3 is also connected in parallel with the debugging breaking switch SB 4.
4. The multifunction analog circuit breaker of claim 1, wherein: the input switch further comprises a breaker failure analog switch SA;
in a PLC program, a breaker failure control loop and an intermediate relay KM1 are arranged, wherein a breaker failure analog switch SA is connected with the relay KM1 in series;
in the starting trip circuit, a normally closed contact controlled by the relay KM1 is connected in series with a normally open contact controlled by the relay DL and the relay TQ, and when the breaker failure analog switch SA is set to be in a failure state, the relay KM1 controls the relay TQ to be incapable of obtaining electricity.
5. A multifunctional analog circuit breaker according to any of claims 1 to 4, characterized in that: the intermediate relay DL is also connected with an external relay ZJ through the output end of the PLC, and a contact controlled by the relay ZJ is connected with the protection device and the position indicator for checking and indicating the position of the circuit breaker by the protection device.
6. A multifunctional analog circuit breaker according to any of claims 1 to 4, characterized in that: the PLC is also provided with a manual closing signal loop, the loop comprises an intermediate relay KM2, and the self-resetting manual closing switch SB1 is connected in parallel with a normally-open contact controlled by the relay KM2 and then connected in series with a normally-closed contact controlled by the relay KM3 and the relay KM 2;
the intermediate relay KM2 is also connected with an external relay SHJ through a PLC output end, and a contact controlled by the relay SHJ is connected with a protection device and an indicator lamp and used for checking the protection device and indicating a manual closing state.
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| CN113284387B (en) * | 2021-05-24 | 2022-11-15 | 上海地铁维护保障有限公司 | 400V spare power automatic switching simulation platform |
| CN113702822B (en) * | 2021-09-13 | 2023-06-27 | 深圳供电局有限公司 | Simulated circuit breaker device for tripping and closing test of power grid relay protection equipment |
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| CN204557894U (en) * | 2015-04-17 | 2015-08-12 | 广东电网有限责任公司阳江供电局 | Mimic-disconnecting switch |
| CN104764998B (en) * | 2015-04-22 | 2017-11-14 | 国家电网公司 | For replacing the simulator of circuit breaker of true primary cut-out in protection test |
| CN204989357U (en) * | 2015-10-15 | 2016-01-20 | 新疆特变电工自控设备有限公司 | Simple analog circuit breaker |
| CN108872840B (en) * | 2018-05-09 | 2019-11-15 | 北京交通大学 | A kind of mimic-disconnecting switch |
| CN110658780A (en) * | 2019-10-13 | 2020-01-07 | 国网山东省电力公司潍坊供电公司 | PLC control system of circuit breaker secondary circuit |
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