CN109346382B - Single lamp indicating device for switching-on and switching-off actions of circuit breaker in high-voltage switch cabinet - Google Patents
Single lamp indicating device for switching-on and switching-off actions of circuit breaker in high-voltage switch cabinet Download PDFInfo
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- CN109346382B CN109346382B CN201811231192.1A CN201811231192A CN109346382B CN 109346382 B CN109346382 B CN 109346382B CN 201811231192 A CN201811231192 A CN 201811231192A CN 109346382 B CN109346382 B CN 109346382B
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- control switch
- circuit breaker
- relay
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- 239000003990 capacitor Substances 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
- H01H2071/042—Means for indicating condition of the switching device with different indications for different conditions, e.g. contact position, overload, short circuit or earth leakage
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Abstract
The embodiment of the invention provides a single-lamp indicating device for the opening and closing actions of a circuit breaker in a high-voltage switch cabinet, which comprises a flash small bus, a control switch, an indicating lamp with four connectors, a closing position relay and a tripping position relay, wherein the indicating lamp is connected with the control switch through the flash small bus; the flash small bus and the indicator lamp are added into the original circuit breaker control circuit, and are connected through different contacts of the control switch, so that the flicker of the indicator lamp is realized by utilizing the principle that the flash small bus and the indicator lamp are not corresponding to the control switch when the circuit breaker is automatically switched on or off, and the specific situation of the switching on or off action of the circuit breaker is judged by combining the position of the control switch, so that the accuracy is high, and the circuit breaker is simple and easy to implement.
Description
Technical Field
The embodiment of the invention relates to the technical field of electrical control, in particular to a single lamp indicating device for switching-on and switching-off actions of a circuit breaker in a high-voltage switch cabinet.
Background
Control of a small busbar in an existing high-voltage switchgear (e.g., a KYN28 high-voltage switchgear) basically meets the control requirements of a circuit breaker, and includes, for example: (1) The circuit breaker switching-on and tripping coils are designed according to short-time power-on, namely, a switching-off switch is quickly reset after action so as to avoid the phenomenon that the coils are burnt out during tripping or switching-on; (2) The control power supply is provided with a monitoring loop, once the control power supply is powered off, the circuit breaker cannot operate, and an acousto-optic signal is sent out to remind related personnel of timely treatment; (3) The circuit breaker has obvious state indication signals for the opening and closing states of the circuit breaker; (4) The circuit breaker can be opened and closed manually and can be opened and closed automatically.
After automatic or manual switching-on, an indicator lamp connected in series to a switching-off coil loop of the existing switch cabinet emits flat light with preset color; after automatic or manual brake opening, the indicator lamp connected in series to the switch-on coil loop emits another preset color flat light, and the indicator lamp emits different colors of flat light in different states so as to provide the operator with the indicating information of the running state of the high-voltage cabinet.
However, when the operator further distinguishes whether the opening and closing operation is manual operation or automatic operation, the information cannot be intuitively obtained by means of the comprehensive protection device, and the action of the circuit breaker is judged by the states of the two different color indicator lamps, so that judgment errors are often caused by confusing the meaning of the information.
Disclosure of Invention
The embodiment of the invention provides a single lamp indicating device for the opening and closing actions of a circuit breaker in a high-voltage switch cabinet, which solves the problems or at least partially solves the problems.
The embodiment of the invention provides a single-lamp indicating device for the opening and closing actions of a circuit breaker in a high-voltage switch cabinet, which comprises a flash small bus, a control switch, an indicating lamp with four connectors, a closing position relay and a tripping position relay, wherein the indicating lamp is connected with the control switch through the flash small bus; wherein,
the small flash bus comprises a flash loop, the flash loop is connected between the small flash bus and a control bus of the circuit breaker in parallel, the small flash bus is respectively connected with a first contact and a second contact of the control switch, one end of a normally open contact of the switching-on position relay is connected with a third contact of the control switch, and one end of a normally open contact of the tripping position relay is connected with a fourth contact of the control switch; the four joints of the indicator lamp with the four joints are respectively connected with a fifth contact, a sixth contact, a seventh contact and an eighth contact of the control switch; the other end of the normally open contact of the switching-on position relay is respectively connected with the fifth contact and the sixth contact, and the other end of the normally open contact of the tripping position relay is respectively connected with the fifth contact and the sixth contact; the seventh contact and the eighth contact are respectively connected with the negative electrode of the control circuit;
the flash circuit comprises a first flash circuit and a second flash circuit which are arranged in parallel, wherein the first flash circuit comprises a normally closed contact of a flash relay, a flash relay coil and a resistor which are sequentially arranged in series, and two ends of the flash relay coil are connected with a capacitor in parallel; the second flash loop comprises a flash relay normally open contact;
when the control switch is in a tripped state, the first contact is connected with the third contact, and the fifth contact is connected with the seventh contact; when the control switch is in a closed state, the second contact and the fourth contact are turned on, and the sixth contact and the eighth contact are turned on.
Further, the control switch is of the type LW2-YZ-1a,4,6a,40, 20, 20/F8.
Further, the indicator light with four joints emits white light when working.
Further, the device comprises a flash small bus, a control switch, an indicator lamp with four connectors, a closing position relay and a tripping position relay; wherein,
the small flash bus comprises a flash loop, the flash loop is connected between the small flash bus and a control bus of the circuit breaker in parallel, the small flash bus is respectively connected with a first contact and a second contact of the control switch, one end of a normally open contact of the switching-on position relay is connected with a third contact of the control switch, and one end of a normally open contact of the tripping position relay is connected with a fourth contact of the control switch; the four joints of the indicator lamp with the four joints are respectively connected with a fifth contact, a sixth contact, a seventh contact and an eighth contact of the control switch; the other end of the normally open contact of the switching-on position relay is respectively connected with the fifth contact and the sixth contact, and the other end of the normally open contact of the tripping position relay is respectively connected with the fifth contact and the sixth contact; the seventh contact and the eighth contact are respectively connected with the negative electrode of the control circuit;
the flash circuit comprises a first flash circuit and a second flash circuit which are arranged in parallel, wherein the first flash circuit comprises a normally closed contact of a flash relay, a flash relay coil and a resistor which are sequentially arranged in series, and two ends of the flash relay coil are connected with a capacitor in parallel; the second flash loop comprises a flash relay normally open contact;
when the control switch is in a tripped state, the first contact is connected with the third contact, and the fifth contact is connected with the seventh contact; when the control switch is in a closed state, the second contact is connected with the fourth contact, and the sixth contact is connected with the eighth contact;
the control switch is of the type LW2-YZ-1a,4,6a,40, 20, 20/F8;
the indicator light with four joints emits white light when in operation.
According to the single-lamp indicating device for the opening and closing actions of the circuit breaker in the high-voltage switch cabinet, provided by the embodiment of the invention, the flash small bus and the indicating lamp are added into the original circuit breaker control circuit, and are connected through different contacts of the control switch, the flash of the indicating lamp is realized by utilizing the principle of non-correspondence between the automatic opening and closing actions of the circuit breaker and the control switch, and the specific situation of the opening and closing actions of the circuit breaker is judged by combining the position of the control switch, so that the accuracy is high, and the device is simple and easy to implement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a flash circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control circuit of a circuit breaker according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a single-lamp indicating device for opening and closing actions of a circuit breaker in a high-voltage switch cabinet, which comprises a flash small bus, a control switch, an indicating lamp with four connectors, a closing position relay and a tripping position relay, wherein the flash small bus is connected with the control switch; wherein,
the small flash bus comprises a flash loop, the flash loop is connected between the small flash bus and a control bus of the circuit breaker in parallel, the small flash bus is respectively connected with a first contact and a second contact of the control switch, one end of a normally open contact of the switching-on position relay is connected with a third contact of the control switch, and one end of a normally open contact of the tripping position relay is connected with a fourth contact of the control switch; the four joints of the indicator lamp with the four joints are respectively connected with a fifth contact, a sixth contact, a seventh contact and an eighth contact of the control switch; the other end of the normally open contact of the switching-on position relay is respectively connected with the fifth contact and the sixth contact, and the other end of the normally open contact of the tripping position relay is respectively connected with the fifth contact and the sixth contact; the seventh contact and the eighth contact are respectively connected with the negative electrode of the control circuit;
the flash circuit comprises a first flash circuit and a second flash circuit which are arranged in parallel, wherein the first flash circuit comprises a normally closed contact of a flash relay, a flash relay coil and a resistor which are sequentially arranged in series, and two ends of the flash relay coil are connected with a capacitor in parallel; the second flash loop comprises a flash relay normally open contact;
when the control switch is in a tripped state, the first contact is connected with the third contact, and the fifth contact is connected with the seventh contact; when the control switch is in a closed state, the second contact and the fourth contact are turned on, and the sixth contact and the eighth contact are turned on.
Fig. 1 is a schematic diagram of a flash loop provided by the embodiment of the present invention, as shown in fig. 1, WTW represents a flash busbar, a normally closed contact KM1 of a flash relay, a flash relay coil KM and a resistor R are sequentially and serially arranged in the first flash loop, and two ends of the flash relay coil KM are connected in parallel with a capacitor C; the second flash loop comprises a normally open contact KM2 of the flash relay.
The principle of the flash is as follows: the test button SE is pressed down, the control busbar positive power supply is connected with the control busbar negative power supply through the normally closed contact KM1 of the flash relay, the capacitor C, the resistor R, the movable contact of the test button SE, the signal lamp HW and the resistor, the capacitor C starts to charge, the potential of the flash busbar is reduced, and then the signal lamp HW darkens due to voltage reduction at two ends. Along with the continuous rising of the charging voltage of the capacitor C connected in parallel with the two ends of the flash relay coil KM, when the operating voltage of the flash relay is reached, the flash relay acts, the normally open contact KM2 is closed, the two ends of the signal lamp HW lighten due to the rising of the voltage, and the potential of the flash busbar rises. Meanwhile, the normally closed point KM1 of the flash relay is disconnected, the capacitor C stops charging, the capacitor C starts to discharge the coil of the flash relay, when the voltage at two ends of the capacitor C is reduced to the return voltage of the flash relay, the flash relay returns, the normally open contact KM2 of the flash relay is disconnected, and HW is darkened; the normally closed contact KM1 is closed and charging of the capacitor C is started again. The signal lamp HW continuously flashes from dark to bright and simultaneously flashes from low to high in the small bus potential.
Specifically, when a circuit breaker control circuit is connected, a test button SE is replaced by a control switch with more contacts, the small flash bus is respectively connected with a first contact and a second contact of the control switch, one end of a normally open contact of the switching-on position relay is connected with a third contact of the control switch, and one end of a normally open contact of the tripping position relay is connected with a fourth contact of the control switch; the four joints of the indicator lamp with the four joints are respectively connected with a fifth contact, a sixth contact, a seventh contact and an eighth contact of the control switch; the other end of the normally open contact of the switching-on position relay is respectively connected with the fifth contact and the sixth contact, and the other end of the normally open contact of the tripping position relay is respectively connected with the fifth contact and the sixth contact; the seventh contact and the eighth contact are respectively connected with the negative electrode of the control circuit. The indicator light emits flat light when the manual switch-on and trip, and the action of switching-on or trip can be judged by combining the position of the control switch.
When the control switch is in the 'after-trip' position, the first contact is connected with the third contact, the fifth contact is connected with the seventh contact, if the automatic device controls the breaker to be automatically switched on at the moment, the normally open contact of the switching-on position relay is closed, the normally open contact of the tripping position relay is opened, the current path is a flash small bus, the first contact, the third contact, the normally open contact of the switching-on position relay, the five-indicator lamp and the seven-control small bus cathode, the indicator lamp emits flash under the action of a flash principle, when the indicator lamp emits flash, and an operator knows that the control switch is in the 'after-trip' position, the action of the breaker at the moment can be judged to be automatic switching-on. And an operator manually adjusts the control switch to a position after switching on, so that the first contact and the third contact are disconnected, the fifth contact and the seventh contact are disconnected, other contacts of the control switch are connected, and the indicator light emits flat light.
When the control switch is in a 'after-closing' position, the second contact is connected with the fourth contact, the sixth contact is connected with the eighth contact, if the automatic device controls the breaker to automatically trip at the moment, or the breaker trips due to faults, the normally open contact of the relay at the closing position is disconnected, the normally open contact of the relay at the tripping position is closed, the current path is a flash busbar-the normally open contact of the second contact-the fourth contact-the tripping position-the normally open contact of the relay-the sixth contact-the indicator lamp-the eighth contact-the control busbar cathode, under the action of a flash principle, the indicator lamp emits flash, and when the indicator lamp emits flash, and operators know that the control switch is in the 'after-closing' position, the action of the breaker at the moment can be judged to be automatic trip. The operator manually adjusts the control switch to the 'tripped' position, then the second contact and the fourth contact are disconnected, the sixth contact and the eighth contact are disconnected, other contacts of the control switch are connected, and the second indicator light emits flat light.
According to the single-lamp indicating device for the opening and closing actions of the circuit breaker in the high-voltage switch cabinet, provided by the embodiment of the invention, the flash small bus and the indicating lamp are added into the original circuit breaker control circuit, and are connected through different contacts of the control switch, the flash of the indicating lamp is realized by utilizing the principle of non-correspondence between the automatic opening and closing actions of the circuit breaker and the control switch, and the specific situation of the opening and closing actions of the circuit breaker is judged by combining the position of the control switch, so that the accuracy is high, and the device is simple and easy to implement.
In the above embodiment, the control switch model is LW2-YZ-1a,4,6a,40, 20, 20/F8.
Wherein all contacts of the LW2-YZ-1a,4,6a,40, 20, 20/F8 type control switch are in the following on states at different positions:
position after closing: 1-3,9-10,16-13,19-17 contacts are connected;
closing position: 5-8,9-12,16-13,19-17 contacts are connected;
preparation closing position: 1-3,9-10,14-13,17-18 contacts;
preparation of the brake release position: 2-4,11-10,14-13,17-18 contacts are connected;
the opening position is as follows: 6-7,11-10,14-15,18-20 contacts are connected;
position after opening the gate: 2-4,11-10,14-15, 18-20 contacts.
Correspondingly, the first, second, third, fourth, fifth, sixth, seventh and eighth contacts in this embodiment correspond to the contacts 18, 13,19, 16, 1, 2, 3 and 4 of the LW2-YZ-1a,4,6a,40, 20, 20/F8 control switch, respectively.
Specifically, fig. 2 is a schematic diagram of a circuit breaker control circuit employing LW2-YZ-1a,4,6a,40, 20, 20/F8 type control switches according to an embodiment of the present invention, as shown in fig. 2.
If the circuit breaker is in the tripped position, the control switch SA is in the "post-trip" position, contacts 1, 3, 15, 14, 18, 19 of the SA are respectively closed. If the automatic device automatically closes the circuit breaker, at the moment, the normally open contact KCC of the relay at the closing position is closed, and the normally open contact KCT of the relay at the tripping position is opened, so that the current flows through the loops where the contacts 1 and 3 and the contacts 18 and 19 are positioned, the current path flashes the busbar, the SA contacts 18 and 19, the KCC, the SA contacts 1 and 3, the negative electrode of the control busbar is connected with the small busbar of the flash power supply to flash, and the control switch is at the position after tripping, so that the automatic closing of the circuit breaker is indicated. The operator opens SA to the position after switching on, contacts 1 and 3, contacts 18 and 19 are opened, contacts 2 and 4 are closed, contacts 20 and 17 are closed, current flows in a loop where the contacts are positioned, SA corresponds to the position of the circuit breaker, and the indicator light emits flat light.
If the circuit breaker is in the tripped position, the control switch SA is in the "after closing" position, contacts 2, 4, 13, 14, 20, 17 of the SA are closed. If the automatic device automatically trips the circuit breaker, at the moment, the normally open contact KCT of the relay at the trip position is closed, and the normally open contact KCC of the relay at the close position is opened, so that the current flows through the loops where the contacts 2 and 4 and the contacts 13 and 14 are positioned, the current path flashes the bus, the SA contacts 13 and 14, the KCT, the SA contacts 2 and 4, the negative electrode of the control busbar is connected to the small busbar of the flash power supply to flash, and the control switch is positioned at the position after closing to indicate the automatic trip of the circuit breaker. The operator strikes SA to the tripped position, contacts 2 and 4, contacts 13 and 14 are disconnected, contacts 1 and 3 are connected, contacts 14 and 15 are connected, current flows in a loop where the contacts are positioned, SA corresponds to the position of the circuit breaker, and the indicator lights emit flat lights.
In the above embodiment, the indicator light with four joints emits white light when in operation.
Specifically, the indicator lights emit white flashes when automatically switched on and emit white flashes when automatically tripped.
In the embodiment, the single-lamp indicating device for the opening and closing actions of the circuit breaker in the high-voltage switch cabinet comprises a small flash bus, a control switch, an indicating lamp with four connectors, a closing position relay and a tripping position relay; wherein,
the small flash bus comprises a flash loop, the flash loop is connected between the small flash bus and a control bus of the circuit breaker in parallel, the small flash bus is respectively connected with a first contact and a second contact of the control switch, one end of a normally open contact of the switching-on position relay is connected with a third contact of the control switch, and one end of a normally open contact of the tripping position relay is connected with a fourth contact of the control switch; the four joints of the indicator lamp with the four joints are respectively connected with a fifth contact, a sixth contact, a seventh contact and an eighth contact of the control switch; the other end of the normally open contact of the switching-on position relay is respectively connected with the fifth contact and the sixth contact, and the other end of the normally open contact of the tripping position relay is respectively connected with the fifth contact and the sixth contact; the seventh contact and the eighth contact are respectively connected with the negative electrode of the control circuit;
the flash circuit comprises a first flash circuit and a second flash circuit which are arranged in parallel, wherein the first flash circuit comprises a normally closed contact of a flash relay, a flash relay coil and a resistor which are sequentially arranged in series, and two ends of the flash relay coil are connected with a capacitor in parallel; the second flash loop comprises a flash relay normally open contact;
when the control switch is in a tripped state, the first contact is connected with the third contact, and the fifth contact is connected with the seventh contact; when the control switch is in a closed state, the second contact is connected with the fourth contact, and the sixth contact is connected with the eighth contact;
the control switch is of the type LW2-YZ-1a,4,6a,40, 20, 20/F8;
the indicator light with four joints emits white light when in operation.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The single-lamp indicating device for the opening and closing actions of the circuit breaker in the high-voltage switch cabinet is characterized by comprising a flash small bus, a control switch, an indicating lamp with four connectors, a closing position relay and a tripping position relay; wherein,
the small flash bus comprises a flash loop, the flash loop is connected between the small flash bus and a control bus of the circuit breaker in parallel, the small flash bus is respectively connected with a first contact and a second contact of the control switch, one end of a normally open contact of the switching-on position relay is connected with a third contact of the control switch, and one end of a normally open contact of the tripping position relay is connected with a fourth contact of the control switch; the four joints of the indicator lamp with the four joints are respectively connected with a fifth contact, a sixth contact, a seventh contact and an eighth contact of the control switch; the other end of the normally open contact of the switching-on position relay is respectively connected with the fifth contact and the sixth contact, and the other end of the normally open contact of the tripping position relay is respectively connected with the fifth contact and the sixth contact; the seventh contact and the eighth contact are respectively connected with the negative electrode of the control circuit;
the flash circuit comprises a first flash circuit and a second flash circuit which are arranged in parallel, wherein the first flash circuit comprises a normally closed contact of a flash relay, a flash relay coil and a resistor which are sequentially arranged in series, and two ends of the flash relay coil are connected with a capacitor in parallel; the second flash loop comprises a flash relay normally open contact;
when the control switch is in a tripped state, the first contact is connected with the third contact, and the fifth contact is connected with the seventh contact; when the control switch is in a closed state, the second contact and the fourth contact are turned on, and the sixth contact and the eighth contact are turned on.
2. The single lamp indicating device for opening and closing actions of a circuit breaker in a high voltage switch cabinet according to claim 1, wherein the control switch is of the type LW2-YZ-1a,4,6a,40, 20, 20/F8.
3. The single lamp indicating device for opening and closing actions of a circuit breaker in a high-voltage switch cabinet according to claim 1, wherein the indicating lamp with four joints emits white light when working.
4. The single lamp indicating device for opening and closing actions of a circuit breaker in a high-voltage switch cabinet according to claim 1, wherein the control switch is of the type LW2-YZ-1a,4,6a,40, 20, 20/F8;
the indicator light with four joints emits white light when in operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811231192.1A CN109346382B (en) | 2018-10-22 | 2018-10-22 | Single lamp indicating device for switching-on and switching-off actions of circuit breaker in high-voltage switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811231192.1A CN109346382B (en) | 2018-10-22 | 2018-10-22 | Single lamp indicating device for switching-on and switching-off actions of circuit breaker in high-voltage switch cabinet |
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| Publication Number | Publication Date |
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| CN109346382A CN109346382A (en) | 2019-02-15 |
| CN109346382B true CN109346382B (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811231192.1A Active CN109346382B (en) | 2018-10-22 | 2018-10-22 | Single lamp indicating device for switching-on and switching-off actions of circuit breaker in high-voltage switch cabinet |
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| CN110514939A (en) * | 2019-09-25 | 2019-11-29 | 海盐伟佳电器科技有限公司 | An analog circuit breaker composed of multiple relays |
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| CN104092300A (en) * | 2014-06-30 | 2014-10-08 | 国家电网公司 | 10kV handcart type high-voltage switch cabinet brake-separating monitoring loop |
| CN204758652U (en) * | 2015-06-17 | 2015-11-11 | 国网辽宁省电力有限公司锦州供电公司 | Portable mimic -disconnecting switch with state prompt facility |
| CN205959867U (en) * | 2016-08-16 | 2017-02-15 | 上海舒盈电气有限公司 | Outdoor high pressure spring operation vacuum circuit breaker's control circuit |
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2018
- 2018-10-22 CN CN201811231192.1A patent/CN109346382B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1014082A (en) * | 1996-06-28 | 1998-01-16 | Meidensha Corp | Operation circuit for circuit breaker |
| JPH1082820A (en) * | 1996-09-05 | 1998-03-31 | Toshiba Corp | Circuit breaker coil disconnection monitoring device |
| CN104034987A (en) * | 2014-06-22 | 2014-09-10 | 国网河北省电力公司衡水供电分公司 | Analog breaker |
| CN104092300A (en) * | 2014-06-30 | 2014-10-08 | 国家电网公司 | 10kV handcart type high-voltage switch cabinet brake-separating monitoring loop |
| CN204758652U (en) * | 2015-06-17 | 2015-11-11 | 国网辽宁省电力有限公司锦州供电公司 | Portable mimic -disconnecting switch with state prompt facility |
| CN205959867U (en) * | 2016-08-16 | 2017-02-15 | 上海舒盈电气有限公司 | Outdoor high pressure spring operation vacuum circuit breaker's control circuit |
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| CN109346382A (en) | 2019-02-15 |
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