CN111192778A - Secondary circuit for reducing burning times of closing coil - Google Patents
Secondary circuit for reducing burning times of closing coil Download PDFInfo
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- CN111192778A CN111192778A CN202010011448.9A CN202010011448A CN111192778A CN 111192778 A CN111192778 A CN 111192778A CN 202010011448 A CN202010011448 A CN 202010011448A CN 111192778 A CN111192778 A CN 111192778A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/28—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a secondary loop for reducing the burning times of a closing coil, which belongs to the technical field of power switch equipment and comprises a closing loop HQ serially connected with a breaker closing coil and an anti-tripping loop TBJV serially connected with an anti-tripping relay, wherein the anti-tripping loop comprises a delay loop, and a normally open contact HBJ-2 and a delay relay SJ of a closing holding relay HBJ are sequentially serially connected between + KM and-KM in the delay loop; a normally closed contact SJ-1 of the delay relay SJ is connected in series between a normally open contact HBJ-1 of a closing holding relay HBJ and the closing holding relay HBJ of the closing loop; the closing loop is connected with an auxiliary contact DL of the breaker in series. The technical scheme provided by the invention has the following beneficial effects: when the switching mechanism is jammed and does not switch on successfully, a contact of the delay relay is delayed to break off a switching-on loop to try to switch on the switching-on and keep the relay to be powered off, so that the switching-on coil is prevented from being burnt. The relay does not conflict with an anti-tripping function and a circuit such as a reclosing switch.
Description
Technical Field
The invention belongs to the technical field of power switching equipment, and particularly relates to a secondary circuit capable of prolonging the service life of a closing coil of a circuit breaker.
Background
The switch equipment comprises circuit switching-on and switching-off equipment such as a circuit breaker, a disconnecting link, a switch cabinet, an air circuit breaker, a low-voltage switch and the like, is important equipment in a transmission, transformation and distribution system, and is very large in usage amount. Taking a circuit breaker as an example, the circuit breaker in a 220kV substation is about 20-30. The circuit breaker is primary equipment of the basis in the power system equipment, and the reliable action of opening and closing of the circuit breaker is the key for ensuring the normal operation of the primary system. The coil is easy to burn out, which is a main problem affecting the action of the circuit breaker, and the condition of circuit breaker failure caused by the coil burning out frequently occurs every year. According to the conventional scheme for burning coils of switches, about 50% of the conventional scheme is caused by the fact that a switch mechanism is jammed, and when the switches are switched on locally or remotely, the switches are not switched on successfully, so that a self-holding loop of an operation loop of a protection device is always electrified, and the switching-on coil is burnt out as a result of electrification.
Primary side equipment in the field of power transmission and transformation technology is generally classified into high voltage equipment of 220kV or more, medium voltage equipment of 110kV, and low voltage equipment of 35kV or 10kV according to its operating voltage. The high-voltage circuit breaker is an important high-voltage switch device, and if a primary circuit where the high-voltage circuit breaker is located has a larger influence range after a fault occurs, the loss load is larger. After installation and commissioning, after maintenance and during periodic maintenance, in order to ensure safe operation of the high-voltage circuit breaker, a plurality of testability tests including mechanical property tests are required to be carried out according to the regulation requirements of power enterprises, and the test parameters of the mechanical property tests include: the switching-off time, the switching-on and switching-off time, the switching-off synchronism, the switching-on synchronism and the like.
The high-voltage circuit breaker can be manually operated and electrically operated, and the opening and closing operation of a switch is completed through an operating mechanism in any operation mode. The energy conversion mechanism is provided with three groups of wiring terminals which are used for accessing the secondary side control signals and correspond to the three groups of operation loops, and each group of wiring terminals comprises a three-phase control signal terminal and a common terminal.
The closing coil is one of the main components of the closing loop of the circuit breaker, and the reliable action of the closing coil is very important for the safe and reliable power supply of the circuit breaker, so that the closing coil also becomes a restriction link influencing the safe, continuous and stable power supply of a transformer substation.
At present, the circuit breaker is switched on according to the short-time power-on design, namely, a switching-on coil of the circuit breaker can only be electrified in a short time. However, when the connection of each part of the operating mechanism, the rotation of the shaft pin are inflexible, the adjustment position of the mechanism pull rod part is improper, the direct current voltage is low, and the like, the circuit breaker cannot be switched on successfully, so that the auxiliary normally closed contact of the circuit breaker cannot be disconnected in time, the switching-on coil is always electrified, and the switching-on coil is burnt out due to the long-time electrification. Therefore, how to improve a closing circuit of a circuit breaker to solve the problem of burning of a closing coil is a technical problem to be solved urgently by a person skilled in the art.
Chinese patent CN103839702B discloses a circuit breaker closing circuit, which includes a dc power supply, a transfer switch, an anti-tripping relay, a locking closing relay, a circuit breaker auxiliary normally closed contact and a closing coil; a group of normally open contacts of the transfer switch are connected in series between the coil of the closing relay and the auxiliary normally closed contact of the breaker, so that when the transfer switch is switched from a remote control position to a closing position, the closing coil is synchronously electrified, and when the transfer switch is switched from the closing position to the remote control position, the closing coil is synchronously electrified. Therefore, the time that the change-over switch is positioned at the switching-on position is controlled, the connection between the switching-on coil and the direct-current power supply can be disconnected when the breaker is not successfully switched on, and therefore the situation that the switching-on coil is burnt out due to long-time power supply caused by unsuccessful switching-on of the breaker is effectively prevented.
Disclosure of Invention
The invention aims to provide a closing secondary circuit connected with a closing coil to reduce the frequent burning phenomenon of the closing coil.
The technical scheme provided by the invention is as follows: a secondary loop for reducing the burning times of a closing coil comprises a closing coil HQ closing loop with a breaker in series and an anti-jump loop with an anti-jump relay TBJV in series, and comprises a delay loop, wherein the delay loop is sequentially provided with a normally open contact HBJ-2 and a delay relay SJ in series between + KM and-KM; a normally closed contact SJ-1 of the delay relay SJ is connected in series between a normally open contact HBJ-1 of a closing holding relay HBJ and the closing holding relay HBJ of the closing loop; the closing loop is connected with an auxiliary contact DL of the breaker in series.
The further improvement is that a normally closed contact TBJV-1 of an anti-jump relay TBJV is connected between a normally open contact HBJ-1 of a closing maintaining relay HBJ and a normally closed contact SJ-1 of a delay relay SJ in the closing loop in series.
The anti-jump circuit is further improved in that the anti-jump circuit comprises a first branch in series with a normally open contact TBJV-2 of an anti-jump relay TBJV and a second branch in series with a normally open contact HBJ-1 of a closing hold relay HBJ, one end of the first branch is connected between the normally open contact HBJ-1 of the closing hold relay HBJ and the normally closed contact TBJV-1 of the anti-jump relay TBJV of the closing circuit, and the other end of the first branch is connected with the second branch and then is connected with the first end of the anti-jump relay TBJV; one end of the second branch is connected to + KM, the other end of the second branch is connected with the first branch and then is connected with the first end of the anti-jump relay TBJV, and the second end of the anti-jump relay TBJV is connected to-KM.
The protection switching-on circuit is further improved in that the protection switching-on circuit comprises a protection switching-on loop connected with a protection switching-on contact HJ-1 in series, and the protection switching-on loop is connected with a normally open contact HBJ-1 of the switching-on holding relay HBJ in parallel.
The remote control switching-on circuit is further improved in that the remote control switching-on circuit comprises a remote control switching-on loop serially connected with a remote control switching-on contact YC-1, and the remote control switching-on loop is connected with a normally open contact HBJ-1 of the switching-on holding relay HBJ in parallel.
The further improvement is that the device comprises a manual closing loop in series connection with a manual closing contact SHJ-1, and the manual closing loop is connected with a normally open contact HBJ-1 of the closing holding relay HBJ in parallel.
The monitoring circuit is characterized by further comprising a monitoring circuit serially connected with a tripping position relay TWJ, wherein one end of the monitoring circuit is connected from + KM, and the other end of the monitoring circuit is connected between a normally closed contact SJ-1 and a normally closed contact KM of the time delay relay SJ of the closing circuit.
A further improvement is that a current limiting resistor R is connected in series in the monitoring loop.
The further improvement is that the time delay of the time delay relay SJ is more than 0.8s and less than 1.8 s.
The further improvement is that the auxiliary contact DL of the breaker is connected between the normally closed contacts SJ-1 and KM of the delay relay SJ in series.
The technical scheme provided by the invention has the following beneficial effects: when the switching mechanism is jammed and does not switch on successfully, a contact of the delay relay is delayed to break off a switching-on loop to try to switch on the switching-on and keep the relay to be powered off, so that the switching-on coil is prevented from being burnt. The relay does not conflict with an anti-tripping function and a circuit such as a reclosing switch.
Drawings
FIG. 1 is a schematic circuit diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram according to a second embodiment of the present invention;
fig. 3 is a schematic circuit diagram according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
It should be noted that the technical problem to be solved by the present invention is different from the technical problem to be solved by the technical scheme provided by chinese patent CN103839702B, in which chinese patent CN103839702B is a contact in a switching-on loop, if the transfer switch is not transferred in place, the switching-on loop is not closed, and the remote switching-on is controlled, and the protection switching-on is also not closed.
Example one
The embodiment is a secondary circuit connected with a closing coil of a circuit breaker and used for reducing the burning times of the closing coil. As many components are involved, a unified description is made here, and as shown in fig. 1, a secondary loop is shown, where + KM and-KM are control power supplies of the secondary loop, a plurality of secondary loops having specific functions, such as a closing loop, an anti-jump loop, a delay loop, and the like, are provided between + KM and-KM, HBJ is a closing holding relay, TBJV is an anti-jump relay, HQ is a closing coil, DL is a breaker auxiliary contact, SJ is a delay relay, HBJ-1 and HBJ-2 are normally open contacts of the closing holding relay, SJ-1 is a normally closed contact of the delay relay SJ, TBJV-1 is a normally closed contact of the anti-jump relay jv, and TBJV-2 is a normally open contact of the anti-jump relay TBJV.
In the embodiment, the system comprises an HQ switching loop with a breaker switching coil and an anti-jump loop with an anti-jump relay TBJV, and further comprises an HQ switching loop with a breaker switching coil and an anti-jump loop with an anti-jump relay TBJV, wherein the HQ switching loop comprises a delay loop, and a normally open contact HBJ-2 and a normally open relay SJ of a switching holding relay HBJ are sequentially connected in series between + KM and-KM in the delay loop; a normally closed contact SJ-1 of the delay relay SJ is connected in series between a normally open contact HBJ-1 of a closing holding relay HBJ and the closing holding relay HBJ of the closing loop; the closing loop is connected with an auxiliary contact DL of the breaker in series.
In this embodiment, the normally closed contact TBJV-1 of the anti-jump relay TBJV is connected in series between the normally open contact HBJ-1 of the closing hold relay HBJ and the normally closed contact SJ-1 of the delay relay SJ in the closing loop.
In this embodiment, the anti-jump loop includes a first branch in which a normally open contact TBJV-2 of the anti-jump relay TBJV is connected in series and a second branch in which a normally open contact HBJ-1 of the closing hold relay HBJ is connected in series, one end of the first branch is connected between the normally open contact HBJ-1 of the closing hold relay HBJ of the belonging closing loop and the normally closed contact TBJV-1 of the anti-jump relay TBJV, and the other end of the first branch is connected with the second branch and then is connected with a first end of the anti-jump relay TBJV; one end of the second branch is connected to + KM, the other end of the second branch is connected with the first branch and then is connected with the first end of the anti-jump relay TBJV, and the second end of the anti-jump relay TBJV is connected to-KM.
Specifically, as can be seen from the figure, the switching-on loop of the embodiment sequentially comprises HBJ-1, TBJV-1, SJ-1, HBJ, DL and HQ from + KM to-KM, wherein the HBJ-1 and the HJ-1 are connected in parallel at two ends; a first branch of the anti-jump loop is connected in series with the TBJV-2 after being connected between the HBJ-1 and the TBJV-1, a second branch of the anti-jump loop is connected in series with TBJ-1 after being connected with + KM, and is connected with-KM after being connected in series with the TBJV after being connected with a point; the time delay loop is provided with HBJ-2 and SJ in series from + KM to-KM.
The embodiment comprises a protection closing loop in series connection with a protection closing contact HJ-1, wherein the protection closing loop is connected in parallel with a normally open contact HBJ-1 of a closing holding relay HBJ.
The working principle of the embodiment is as follows: under normal conditions, when the local switching-on or the remote control switching-on, the contact HJ-1 is closed, the relay HBJ and the coil HQ are simultaneously electrified, and when the switching equipment breaker of the embodiment is switched on, the DL node is disconnected, and the switching-on loop is disconnected. When the switch mechanism of the circuit breaker is blocked, the DL contact cannot be disconnected, the coil HQ is electrified all the time, when the contact HBJ-2 is closed, the time delay relay SJ starts to time, and when the set time is reached, the relay SJ acts, the SJ-1 contact is disconnected, the closing loop is disconnected, and the closing coil is prevented from being burnt due to long-time electrification. In this embodiment, the action time set by the delay relay SJ is 1.1s, and the set time can be adjusted according to actual conditions.
Example two
The embodiment is a secondary circuit connected with a closing coil of a circuit breaker and used for reducing the burning times of the closing coil. As shown in fig. 2, the present embodiment is different from the first embodiment in that, in addition to the protection closing circuit having the protection closing contact HJ-1 connected in series, the present embodiment further includes a remote control closing circuit having the remote control closing contact YC-1 connected in series and a manual closing circuit having the manual closing contact SHJ-1 connected in series, and the protection closing circuit, the remote control closing circuit, and the manual closing circuit are all connected in parallel with the normally open contact HBJ-1 of the closing holding relay HBJ.
EXAMPLE III
The embodiment is a secondary circuit connected with a closing coil of a circuit breaker and used for reducing the burning times of the closing coil. As shown in fig. 3, the present embodiment is different from the second embodiment in that the present embodiment includes a monitoring loop in which a trip position relay TWJ is connected in series, one end of the monitoring loop is connected from + KM, and the other end of the monitoring loop is connected between normally closed contacts SJ-1 and-KM of the delay relay SJ of the closing loop, and a current limiting resistor R is connected in series in the monitoring loop.
As shown in fig. 1, a time relay SJ is added to the existing closing circuit. Normally, when the on-site switching-on, the protection switching-on or the remote control switching-on is performed, the nodes SHJ-1, HJ-1 and YC-1 are closed, the switching-on maintaining relay HBJ and the switching-on coil HQ are simultaneously electrified, the switch is switched on, and after the switch is switched on, the switch equipment, namely the auxiliary contact DL of the circuit breaker of the embodiment is disconnected, and the switching-on loop is disconnected. When the switch has the conditions that all parts of the operating mechanism are connected, the shaft pin is not flexible to rotate, the adjustment position of the mechanism pull rod part is not proper, the direct-current voltage is low and the like, the auxiliary contact DL cannot be disconnected, the HBJ-1 contact is always closed, the switch-on holding relay HBJ is always electrified, the switch-on coil HQ is also always electrified, and the switch-on coil is burnt out as a result of long-time electrification. After a delay relay SJ is added (the delay disconnection time is set to be 1 so as to ensure that a reclosing can correctly act), when the set time is reached, the relay SJ acts, an SJ-1 node is disconnected, the switching-on maintaining relay HBJ loses power, an HBJ-1 contact is disconnected, a switching-on loop is disconnected, and therefore it is ensured that a switching-on coil cannot be burnt out due to long-time electrification.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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 (10)
1. The utility model provides a reduce secondary circuit of combined floodgate coil number of times of burning out, has the combined floodgate return circuit of circuit breaker combined floodgate coil HQ and the anti-jump return circuit that the cluster has anti-jump relay TBJV, its characterized in that: the system comprises a delay loop, wherein a normally open contact HBJ-2 and a delay relay SJ of a closing holding relay HBJ are sequentially connected in series between a + KM end of a breaker and a-KM end of the breaker in the delay loop; a normally closed contact SJ-1 of the delay relay SJ is connected in series between a normally open contact HBJ-1 of a closing holding relay HBJ and the closing holding relay HBJ of the closing loop; the closing loop is connected with an auxiliary contact DL of the breaker in series.
2. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 1, wherein: and a normally closed contact TBJV-1 of an anti-jump relay TBJV is connected in series between a normally open contact HBJ-1 of a closing holding relay HBJ and a normally closed contact SJ-1 of a delay relay SJ of the closing loop.
3. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 2, characterized in that: the anti-jump loop comprises a first branch in series connection with a normally open contact TBJV-2 of an anti-jump relay TBJV and a second branch in series connection with a normally open contact HBJ-1 of a closing hold relay HBJ, one end of the first branch is connected between the normally open contact HBJ-1 of the closing hold relay HBJ and the normally closed contact TBJV-1 of the anti-jump relay TBJV of the belonging closing loop, and the other end of the first branch is connected with the second branch and then is connected with the first end of the anti-jump relay TBJV together; one end of the second branch is connected to + KM, the other end of the second branch is connected with the first branch and then is connected with the first end of the anti-jump relay TBJV, and the second end of the anti-jump relay TBJV is connected to-KM.
4. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 1, wherein: the protection switching-on circuit comprises a protection switching-on loop connected with a protection switching-on contact HJ-1 in series, and the protection switching-on loop is connected with a normally open contact HBJ-1 of a switching-on holding relay HBJ in parallel.
5. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 1, wherein: the remote control switching-on circuit comprises a remote control switching-on loop serially connected with a remote control switching-on contact YC-1, and the remote control switching-on loop is connected with a normally open contact HBJ-1 of a switching-on holding relay HBJ in parallel.
6. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 1, wherein: the manual closing circuit is connected with a normally open contact HBJ-1 of the closing holding relay HBJ in parallel.
7. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 1, wherein: the monitoring circuit comprises a monitoring circuit in series with a tripping position relay TWJ, one end of the monitoring circuit is connected from + KM, and the other end of the monitoring circuit is connected between a normally closed contact SJ-1 and-KM of the time delay relay SJ of the closing circuit.
8. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 7, wherein: a current limiting resistor R is connected in series in the monitoring loop.
9. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 1, wherein: and the time delay of the time delay relay SJ is more than 0.8s and less than 1.8 s.
10. The secondary circuit for reducing the burn-out frequency of the closing coil according to claim 1, wherein: and the auxiliary contact DL of the breaker is connected between the normally closed contacts SJ-1 and KM of the delay relay SJ in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010011448.9A CN111192778A (en) | 2020-01-06 | 2020-01-06 | Secondary circuit for reducing burning times of closing coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010011448.9A CN111192778A (en) | 2020-01-06 | 2020-01-06 | Secondary circuit for reducing burning times of closing coil |
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| Publication Number | Publication Date |
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| CN111192778A true CN111192778A (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010011448.9A Pending CN111192778A (en) | 2020-01-06 | 2020-01-06 | Secondary circuit for reducing burning times of closing coil |
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| Country | Link |
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| CN (1) | CN111192778A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509667A (en) * | 2020-05-29 | 2020-08-07 | 常州佳讯光电***工程有限公司 | Undervoltage protection control device matched with distributed photovoltaic grid-connected switch |
| CN113315098A (en) * | 2021-06-04 | 2021-08-27 | 贵州电网有限责任公司 | Control circuit for preventing breaker tripping coil from being burnt |
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| CN204720972U (en) * | 2015-07-14 | 2015-10-21 | 国家电网公司 | A kind of protective device of 10kV breaker closing coil |
| CN207896644U (en) * | 2018-03-15 | 2018-09-21 | 宁波奥克斯高科技有限公司 | A kind of anti-closing loop of the band of breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202535044U (en) * | 2012-04-11 | 2012-11-14 | 济南市历城区供电公司 | Breaker switching-on and tripping control circuit |
| CN203760403U (en) * | 2013-12-31 | 2014-08-06 | 国网宁夏电力公司固原供电公司 | Circuit breaker with time relay |
| CN204720972U (en) * | 2015-07-14 | 2015-10-21 | 国家电网公司 | A kind of protective device of 10kV breaker closing coil |
| CN207896644U (en) * | 2018-03-15 | 2018-09-21 | 宁波奥克斯高科技有限公司 | A kind of anti-closing loop of the band of breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111509667A (en) * | 2020-05-29 | 2020-08-07 | 常州佳讯光电***工程有限公司 | Undervoltage protection control device matched with distributed photovoltaic grid-connected switch |
| CN113315098A (en) * | 2021-06-04 | 2021-08-27 | 贵州电网有限责任公司 | Control circuit for preventing breaker tripping coil from being burnt |
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Application publication date: 20200522 |
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| RJ01 | Rejection of invention patent application after publication |