CN111446130A - Monitoring circuit of circuit breaker protection tripping circuit - Google Patents
Monitoring circuit of circuit breaker protection tripping circuit Download PDFInfo
- Publication number
- CN111446130A CN111446130A CN202010235381.7A CN202010235381A CN111446130A CN 111446130 A CN111446130 A CN 111446130A CN 202010235381 A CN202010235381 A CN 202010235381A CN 111446130 A CN111446130 A CN 111446130A
- Authority
- CN
- China
- Prior art keywords
- protection
- trip
- circuit
- monitoring
- circuit breaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- H01H2071/044—Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures
Landscapes
- Breakers (AREA)
Abstract
The invention discloses a monitoring circuit of a breaker protection tripping loop, wherein in the circuit, the positive electrode of a direct current power supply is respectively connected with one end of a protection tripping outlet relay normally open contact and one end of a protection tripping monitoring lamp, the other end of the protection tripping monitoring lamp is connected with one end of a protection tripping position relay coil, the other end of the protection tripping position relay coil and the other end of the protection tripping outlet relay normally open contact are respectively connected with one end of a protection tripping pressure plate, the other end of the protection tripping pressure plate is connected with one end of a breaker auxiliary normally open contact, the other end of the breaker auxiliary normally open contact is connected with one end of a tripping coil, and the other end of the tripping coil is connected with the negative electrode of the direct current power supply; the monitoring circuit of the circuit breaker protection tripping circuit can quickly determine whether the circuit breaker protection tripping circuit is in fault or not by monitoring the on and off of the protection tripping monitoring lamp and the fault information of the fault of the circuit breaker protection tripping circuit, thereby being convenient for finding and processing the fault in time.
Description
Technical Field
The invention relates to the technical field of circuit breaker protection control, in particular to a monitoring circuit of a circuit breaker protection tripping circuit.
Background
The high-voltage circuit breaker is used as important electrical equipment in a power system, can switch on and off load current under normal conditions, and can timely cut off a fault line when a line and load side equipment have faults, so that the safety of a power supply system is ensured. If the protection tripping loop of the circuit breaker fails to find and process in time, when the short-circuit fault happens to the equipment on the line side and the load side, the protection of the circuit breaker can be refused, the superior circuit breaker can trip and break a fault point, large-area power loss is caused, and the loss is huge. In the prior art, a separating position monitoring loop of the circuit breaker can only monitor whether a separating brake peripheral element of the circuit breaker has an abnormal condition or not, and can not effectively monitor the integrity of the whole protection tripping loop. Therefore, it is necessary to provide a circuit for monitoring a trip circuit of a circuit breaker, which can timely monitor whether the trip circuit of the circuit breaker is complete and reliable, and then timely take processing measures to ensure that the trip circuit of the circuit breaker is reliable.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a monitoring circuit of a breaker protection tripping circuit. The specific technical scheme is as follows:
a circuit breaker protection trip circuit monitoring circuit, the circuit comprising: the trip protection circuit comprises a direct-current power supply, a trip protection outlet relay normally open contact, a trip protection monitoring lamp, a trip protection position relay coil, a trip protection pressing plate, a breaker auxiliary normally open contact and a separating brake coil; the positive pole of the direct current power supply is respectively connected with one end of a normally open contact of the trip protection outlet relay and one end of the trip protection monitoring lamp, the other end of the trip protection monitoring lamp is connected with one end of the trip protection position relay coil, the other end of the trip protection position relay coil and the other end of the normally open contact of the trip protection outlet relay are respectively connected with one end of the trip protection pressing plate, the other end of the trip protection pressing plate is connected with one end of an auxiliary normally open contact of the circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected with one end of the opening coil, and the other end of the opening coil is connected with the negative pole of the direct current power supply; the circuit breaker auxiliary normally open contact is in a closed state under a closing state of the circuit breaker, and the resistance of the relay coil at the trip protection position meets the condition that the partial pressure is equal to the value of the brake separating coil, so that the brake separating coil cannot be started.
In one possible design, the circuit further includes: a trip hold relay coil and a trip hold relay latching contact; the tripping and holding relay coil is connected between the protection tripping pressure plate and the breaker auxiliary normally open contact in series, one end of the tripping and holding relay self-holding contact is connected with the positive electrode of the direct-current power supply, and the other end of the tripping and holding relay self-holding contact is connected with the common ends of the protection tripping pressure plate and the tripping and holding relay coil.
In one possible design, the voltage of the dc power supply is 220V.
In one possible design, the protective jump monitoring lamp is a yellow emitting L ED lamp.
In one possible design, the protection jump position monitoring lamp, the protection trip position relay coil, the trip holding relay self-holding contact and the protection trip outlet relay normally open contact are all internal elements of a microcomputer protection measurement and control device.
In one possible design, the working state of the protection jump monitoring lamp is displayed on a microcomputer protection measurement and control device.
In a possible design, the circuit breaker normal during operation, if the protection tripping circuit of meeting the circuit breaker is incomplete, the protection is jumped the position and is kept watch on the lamp and is extinguished, protection tripping position relay coil loses electricity, and protection tripping position relay normally closed contact is reset, has switched on the volume of opening information of "circuit breaker protection tripping circuit trouble" show on the LCD screen of computer protection measurement and control device.
In a possible design, the microcomputer protection measurement and control device is in communication connection with a background monitoring microcomputer through a communication cable, and the background monitoring microcomputer can acquire the input quantity fault information of the breaker protection tripping circuit fault on the microcomputer protection measurement and control device and display and give a fault alarm on line.
The technical scheme of the invention has the following main advantages:
according to the monitoring circuit of the circuit breaker protection tripping circuit, the protection tripping monitoring lamp is additionally arranged on the circuit breaker protection tripping circuit, so that when the circuit breaker normally runs with load, the positive pole of a direct current power supply is finally connected to the negative pole of the direct current power supply through the protection tripping monitoring lamp, the protection tripping position relay coil, the protection tripping pressing plate, the tripping holding relay coil, the circuit breaker auxiliary normally open contact and the tripping coil, the protection tripping circuit is complete, and the protection tripping monitoring lamp is lightened. If the protection tripping circuit breaks down, namely the protection tripping pressure plate, the tripping holding relay coil, the auxiliary normally open contact of the circuit breaker, the opening coil and any element in the direct current power supply or a connecting line between the elements break down, the protection tripping monitoring lamp is extinguished, the protection tripping circuit of the circuit breaker is incomplete, at the moment, if the line and the load side equipment have short-circuit faults, the circuit breaker cannot be tripped by protection action, the tripping of a superior circuit breaker is carried out beyond a fault point, and large-area power loss is caused, and the loss is huge. Therefore, operation and maintenance personnel can timely obtain the fault information of the circuit breaker protection tripping circuit and quickly process the fault information through the on-line alarm information of the circuit breaker protection tripping circuit fault on the background monitoring microcomputer or check the extinguishing of the protection tripping monitoring lamp on the microcomputer protection measurement and control device on site, thereby avoiding the expansion of the fault range.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a monitoring circuit diagram of a circuit breaker protection trip circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides a monitoring circuit of a breaker protection tripping loop, which comprises a direct-current power supply KM, a protection tripping outlet relay normally-open contact BTJ, a protection tripping monitoring lamp HY, a protection tripping position relay coil BTWJ, a protection tripping pressing plate L P1, a breaker auxiliary normally-open contact QF and a tripping coil TQ as shown in figure 1, wherein a positive electrode + KM of the direct-current power supply is respectively connected with one end of the protection tripping outlet relay normally-open contact BTJ and one end of the protection tripping monitoring lamp HY, the other end of the protection tripping monitoring lamp HY is connected with one end of the protection tripping position relay coil BTWJ, the other end of the protection tripping position relay coil BTWJ and the other end of the protection tripping outlet relay normally-open contact BTJ are respectively connected with one end of a protection tripping pressing plate L P1, the other end of the protection tripping pressing plate L P1 is connected with one end of the breaker auxiliary normally-open contact QF, the other end of the breaker normally-open contact QF is connected with one end of a tripping coil, the other end of the breaker auxiliary normally-open contact QF is connected with one end of the tripping coil, the breaker is in a state from a voltage dividing coil to the switching coil TQ, and the auxiliary tripping coil.
The working principle of the monitoring circuit of the breaker protection tripping circuit provided by the embodiment of the invention is explained as follows:
when a short circuit fault occurs in a line and a load device, the normally open contact BTJ of the protection trip outlet relay in the protection device is closed, the circuit breaker protection trip circuit is switched on, the tripping coil TQ is electrified, the tripping electromagnet is driven to act, the circuit breaker protection trip is realized, the circuit breaker is switched off, the fault current is cut off, the protection trip position monitoring lamp HY is connected with the normally open contact BTJ of the protection trip outlet relay, the monitoring loop is formed by connecting the protection trip position relay coil BTWJ in parallel with the normally open contact BTJ of the protection trip outlet relay, the tripping electromagnet is driven to act, the protection trip monitoring lamp is connected with the direct current power supply KM and is switched on, the protection trip position monitoring lamp is connected with the normally open contact BTJ of the protection trip outlet relay, the protection trip coil BTWJ L P1, the normally open contact of the circuit breaker auxiliary trip coil and the tripping coil TQ, and the direct current power supply has no fault when the protection trip voltage is lower than that the normally open circuit breaker protection trip position monitoring lamp is switched on, the protection trip position monitoring lamp is switched on, and the circuit breaker protection trip position monitoring circuit breaker is not interfered by the auxiliary trip coil TQ, and the circuit breaker TQ, the working trip position monitoring circuit breaker protection trip position monitoring lamp is not interfered by the auxiliary trip position monitoring circuit breaker 1.
According to the monitoring circuit of the circuit breaker protection tripping circuit, the protection tripping monitoring lamp HY is additionally arranged on the circuit breaker protection tripping circuit, so that when the circuit breaker normally runs with a load, the positive electrode + KM of a direct-current power supply passes through the protection tripping monitoring lamp HY, the protection tripping position relay coil BTWJ, the protection tripping pressing plate L P1, the auxiliary normally open contact QF and the separating brake coil TQ, and is finally connected to the negative electrode-KM of the direct-current power supply, the protection tripping circuit is complete, and the protection tripping monitoring lamp HY is lightened.
The protective jump-position monitoring lamp HY may be L ED lamp, for example, it may be yellow light L ED lamp.
Further, the circuit also comprises a trip hold relay coil TBJ and a trip hold relay self-hold contact TBJ1, wherein the trip hold relay coil TBJ is connected in series between the protection trip pressure plate L P1 and the breaker auxiliary normally open contact QF, one end of the trip hold relay self-hold contact TBJ1 is connected with the positive pole + KM of the direct current power supply, and the other end is connected with the common end of the protection trip pressure plate L P1 and the trip hold relay coil TBJ.
With the arrangement, when the trip holding relay coil TBJ is electrified, the trip holding relay self-holding contact TBJ1 is closed, so that the situation that the tripping coil TQ is not correctly and reliably operated due to the fact that the tripping contact is short in closing time or too fast in return or the tripping due to short circuit fault protects the normally open contact BTJ of the trip outlet relay to shake and be insufficiently closed during tripping due to the short circuit fault can be prevented. And the direct current power supply KM is switched on through the trip holding relay self-holding contact TBJ1 to supply power for the protection trip circuit, so that the reliability of normal opening and protection trip circuit of the circuit breaker is improved.
The trip position protection relay coil BTWJ is a voltage coil, the trip maintaining relay is a current type relay, and the opening coil TQ is a voltage starting element. The resistance value of the protective trip position relay coil BTWJ is more than 100 times of the resistance value of the opening coil TQ.
The monitoring circuit of the circuit breaker protection trip loop is on for a long time during operation, and the protection trip position relay coil BTWJ and the opening coil TQ are connected in series (the resistance of the trip hold relay coil TBJ is small and negligible), and the two share the voltage of 220V. However, the resistance of the trip position protection relay coil BTWJ is very large, for example, the resistance of the trip position protection relay coil BTWJ is 18.27k Ω, while the resistance of the opening coil TQ is only more than 100 Ω, the former is far more than the latter, so the voltage shared by the opening coil TQ is very low, and the opening coil TQ is not enough to make the opening coil TQ operate because the opening coil TQ is a voltage starting element; similarly, because the trip hold relay in the monitoring circuit is a current type relay, the coil resistance of the trip hold relay is very small, even if the circuit is switched on, the current of the monitoring circuit is very low, generally dozens of mA, the trip hold relay does not act, the self-holding contact of the trip hold relay does not switch on, and the tripping coil TQ does not act. In addition, the protective trip position relay coil BTWJ of the circuit is a voltage coil, the problem of long-term energization is considered from the design aspect, the protective trip position relay coil BTWJ cannot be burnt, and the safety and the stability are high.
In the embodiment of the invention, except a breaker 1DK, a protective trip pressure plate L P1, an auxiliary normally open contact QF and a separating brake coil TQ at a position of a direct-current power supply KM, a protective trip position monitoring lamp HY, a protective trip position relay coil BTWJ, a coil TBJ of a trip holding relay, a self-holding contact TBJ1 of the protective trip position relay coil and a normally open contact BTJ of a protective trip outlet relay are all internal elements of a microcomputer protective measurement and control device, wherein the protective trip position monitoring lamp HY is installed on a panel of the microcomputer protective measurement and control device, and the protective trip position relay coil BTWJ is installed on a circuit board.
Optionally, when the protection tripping circuit of the circuit breaker is incomplete, the protection tripping monitoring lamp HY is turned off, meanwhile, the coil BTWJ of the protection tripping position relay loses power, the normally closed contact of the protection tripping position relay returns, the input quantity information of the 'fault of the protection tripping circuit of the circuit breaker' is switched on, and the input quantity information is displayed on a liquid crystal screen of the microcomputer protection measurement and control device.
Optionally, the microcomputer protection measurement and control device is connected with the background monitoring microcomputer through a communication cable, and the background monitoring microcomputer can acquire the input quantity fault information of the 'circuit breaker protection tripping circuit fault' on the microcomputer protection measurement and control device. So set up, be convenient for obtain circuit breaker protection tripping circuit fault situation fast in off-site area. The communication cable can be connected to the communication interface of the microcomputer protection measurement and control device to realize the connection with the background monitoring microcomputer. The microcomputer protection measurement and control devices and the background monitoring microcomputer are connected with a communication management machine, and information collected on each microcomputer protection measurement and control device can be collected and processed through the communication management machine and then is transmitted to the background monitoring microcomputer through communication. The on-line display of the fault information of the circuit breaker protection tripping circuit fault on a background monitoring microcomputer is realized.
Furthermore, the background monitoring microcomputer can be connected with an alarm device, and after the background monitoring microcomputer receives fault information of 'circuit breaker protection tripping circuit fault', the alarm device sends out alarm information to warn workers. The alarm device can be an audible and visual alarm or the like.
To sum up, in the monitoring circuit of the circuit breaker protection trip circuit provided by the embodiment of the present invention, when the circuit breaker is in normal live operation, the protection trip monitoring lamp HY in the monitoring circuit of the circuit breaker protection trip circuit is turned on, which indicates that the circuit breaker protection trip circuit is complete and has no abnormality, if the connection of the protection trip pressing plate L P1 contact is loose and contact failure, the trip maintaining relay coil TBJ of the microcomputer protection measurement and control device, the auxiliary normally open contact QF of the circuit breaker, the separating gate coil TQ, and other failures occur, or after the equipment maintenance test and before power transmission forgets to turn on the protection trip pressing plate L P1, the protection trip monitoring lamp HY on the microcomputer protection measurement and control device cannot be turned on, and meanwhile, the background monitoring microcomputer also sends out the failure information of "the circuit breaker protection trip circuit failure", which indicates that the protection trip circuit of the circuit breaker is incomplete and has a failure, and measures should be taken in time to process, thereby ensuring that the circuit breaker protection trip can be reliably realized when the short-circuit breaker protection trip circuit failure occurs on the line and the.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A circuit breaker protection trip circuit monitoring circuit, the circuit comprising: the trip protection circuit comprises a direct-current power supply, a trip protection outlet relay normally open contact, a trip protection monitoring lamp, a trip protection position relay coil, a trip protection pressing plate, a breaker auxiliary normally open contact and a separating brake coil;
the positive pole of the direct current power supply is respectively connected with one end of a normally open contact of the trip protection outlet relay and one end of the trip protection monitoring lamp, the other end of the trip protection monitoring lamp is connected with one end of the trip protection position relay coil, the other end of the trip protection position relay coil and the other end of the normally open contact of the trip protection outlet relay are respectively connected with one end of the trip protection pressing plate, the other end of the trip protection pressing plate is connected with one end of an auxiliary normally open contact of the circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected with one end of the opening coil, and the other end of the opening coil is connected with the negative pole of the direct current power supply;
the auxiliary normally open contact of the circuit breaker is in a closed state under the closing state of the circuit breaker,
and the resistance of the relay coil at the trip protection position meets the condition that the opening coil cannot be started after voltage division.
2. The circuit breaker protection trip circuit monitoring circuit of claim 1 wherein the circuit further comprises: a trip hold relay coil and a trip hold relay latching contact;
the tripping and holding relay coil is connected between the protection tripping pressure plate and the breaker auxiliary normally open contact in series, one end of the tripping and holding relay self-holding contact is connected with the positive electrode of the direct-current power supply, and the other end of the tripping and holding relay self-holding contact is connected with the common ends of the protection tripping pressure plate and the tripping and holding relay coil.
3. The circuit breaker protection trip circuit monitoring circuit of claim 1 wherein the voltage of the dc power source is 220V.
4. The circuit breaker protection trip circuit monitoring circuit of claim 1 wherein said protection trip monitoring light is a yellow colored light emitting L ED light.
5. The circuit breaker trip circuit breaker of claim 2 wherein said trip position monitoring lights, said trip position protection relay coil, said trip hold relay latching contacts, and said trip outlet relay normally open contacts are all microcomputer protection instrumentation internal components.
6. The circuit breaker protection trip circuit monitoring circuit of claim 5 wherein the operating status of the protection trip monitoring lights is displayed on a microcomputer protection measurement and control device.
7. The circuit breaker protection trip circuit monitoring circuit according to claim 6, wherein when the circuit breaker is in normal operation, if the protection trip circuit of the circuit breaker is not complete, the protection trip position monitoring lamp is turned off, the protection trip position relay coil is de-energized, the normally closed contact of the protection trip position relay is reset, and the input information of the 'fault of the circuit breaker protection trip circuit' is switched on and displayed on the liquid crystal screen of the microcomputer protection measurement and control device.
8. The circuit breaker protection tripping circuit monitoring circuit according to claim 7, characterized in that the microcomputer protection measurement and control device establishes communication connection with a background monitoring microcomputer through a communication cable, and the background monitoring microcomputer can acquire the input information of the 'circuit breaker protection tripping circuit fault' on the microcomputer protection measurement and control device to realize on-line display and fault alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235381.7A CN111446130A (en) | 2020-03-30 | 2020-03-30 | Monitoring circuit of circuit breaker protection tripping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235381.7A CN111446130A (en) | 2020-03-30 | 2020-03-30 | Monitoring circuit of circuit breaker protection tripping circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111446130A true CN111446130A (en) | 2020-07-24 |
Family
ID=71651036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010235381.7A Pending CN111446130A (en) | 2020-03-30 | 2020-03-30 | Monitoring circuit of circuit breaker protection tripping circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111446130A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259415A (en) * | 2020-09-29 | 2021-01-22 | 许继集团有限公司 | Jump position monitoring circuit for relieving circuit heating by utilizing relay switching |
| CN112421581A (en) * | 2020-09-23 | 2021-02-26 | 广东电网有限责任公司 | Monitoring device, system and method for microcomputer protection |
| CN114123132A (en) * | 2021-11-25 | 2022-03-01 | 国网天津市电力公司 | Tripping circuit of intelligent terminal for automatic switching circuit breaker in position division and monitoring method thereof |
-
2020
- 2020-03-30 CN CN202010235381.7A patent/CN111446130A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421581A (en) * | 2020-09-23 | 2021-02-26 | 广东电网有限责任公司 | Monitoring device, system and method for microcomputer protection |
| CN112259415A (en) * | 2020-09-29 | 2021-01-22 | 许继集团有限公司 | Jump position monitoring circuit for relieving circuit heating by utilizing relay switching |
| CN112259415B (en) * | 2020-09-29 | 2023-05-02 | 许继集团有限公司 | Jump monitoring circuit for relieving heating of circuit by switching relay |
| CN114123132A (en) * | 2021-11-25 | 2022-03-01 | 国网天津市电力公司 | Tripping circuit of intelligent terminal for automatic switching circuit breaker in position division and monitoring method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109884521B (en) | Circuit breaker divide-shut brake control circuit broken wire monitoring alarm circuit | |
| CN111446130A (en) | Monitoring circuit of circuit breaker protection tripping circuit | |
| KR102145266B1 (en) | System and method for monitoring power system | |
| CN106712017B (en) | Double-bus secondary voltage switching circuit and self-holding circuit thereof | |
| KR100903149B1 (en) | Monitoring device for trip circuit of circuit breaker | |
| CN209803293U (en) | Circuit breaker closing and opening control circuit broken wire monitoring and alarming circuit | |
| CN109870647A (en) | A kind of monitoring system of breaker open operation electric loop failure | |
| CN106787222B (en) | Main transformer neutral point grounding disconnecting link remote control circuit | |
| KR101349333B1 (en) | Power monitoring switchboard | |
| CN111458633B (en) | Tripping and closing monitoring circuit and fault alarming method | |
| US20190058354A1 (en) | Electronic Status Reporting Circuit Breaker | |
| CN112599370A (en) | Rail transit safety interlocking device | |
| CN106300102A (en) | A kind of method realizing tranformer protection hotline maintenance by instantaneous transmission | |
| CN115092223A (en) | Reverse cutting equipment for rail transit signal system | |
| CN106774026B (en) | Intelligent line controller | |
| CN114285165A (en) | Intelligent circuit breaker system | |
| CN211788868U (en) | Monitoring circuit of circuit breaker protection tripping circuit | |
| CN209946326U (en) | Breaker opening electric loop fault monitoring system | |
| CN116774629B (en) | Intelligent monitoring module and method for relay protection outlet loop number | |
| CN206611180U (en) | Double-bus secondary voltage switching circuit and its self-hold circuit | |
| CN111293673A (en) | Trip circuit for transformer backup protection | |
| CN107359613B (en) | Intelligent control system and method for three-phase power supply of garage | |
| CN214410995U (en) | Rail transit safety interlocking device | |
| CN111585255B (en) | Trip monitoring loop | |
| CN210092862U (en) | Temperature detection device capable of automatically cutting off control loop and circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |