CN219016479U - Monitoring circuit for protecting tripping circuit - Google Patents
Monitoring circuit for protecting tripping circuit Download PDFInfo
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- CN219016479U CN219016479U CN202320114836.9U CN202320114836U CN219016479U CN 219016479 U CN219016479 U CN 219016479U CN 202320114836 U CN202320114836 U CN 202320114836U CN 219016479 U CN219016479 U CN 219016479U
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Abstract
The application relates to substation equipment technical field, concretely relates to monitoring circuit of protection tripping circuit, monitoring circuit of protection tripping circuit includes: the voltage relay coil is connected with a protection resistor in series and is connected with two ends of a tripping outlet contact of the protection device in parallel; and a normally-open contact of the normally-closed contact series-connection switching-on position relay of the voltage relay is connected into a signal switching-on loop of the protection measurement and control device. Detecting the integrity of connecting wires and elements between a control loop direct current power supply positive electrode and a protective tripping relay contact, then to a protective tripping outlet pressing plate, then to an external locking tripping contact, then to a tripping holding relay, and then to a switching-off monitoring loop and a contact 3; when part of the protection tripping circuit is disconnected, the protection measurement and control device sends out a protection tripping circuit disconnection signal, and an operation and maintenance person timely checks and processes faults according to whether the protection tripping circuit sends out the disconnection signal.
Description
Technical Field
The application relates to the technical field of substation equipment, in particular to a monitoring loop of a protection tripping loop
Background
With the development of social economy and the progress of power industry, the stability and reliability of power resource supply are becoming important points of research and attention in power construction and development. As important electrical equipment in a power system, a high-voltage circuit breaker can cut off a fault line in time when the line and load side equipment are in fault, so that the safety of the power supply system is ensured.
In the normal operation process, the protection tripping circuit of the circuit breaker may have the possibility of disconnection because of poor loose contact of screws, forgetting to put into a protection tripping outlet pressing plate when the circuit breaker is in a closing position, and the like.
In the prior art, a brake-separating monitoring loop of the circuit breaker only monitors whether a direct current power supply negative electrode of a control circuit reaches a tripping coil of the circuit breaker, then reaches an auxiliary switch contact of the circuit breaker, and finally reaches a connecting wire and an element between a parallel contact 3 of the brake-separating monitoring loop and whether the direct current power supply fails or not; the positive pole of the control loop dc power supply cannot be connected to the protection trip relay contact, to the protection trip outlet pressure plate, to the external latching trip contact, to the trip hold relay, to the split brake monitoring loop and to the connection lines between the contacts 3 and the integrity of the components.
Therefore, it is necessary to provide a monitoring circuit of a protection tripping circuit, which can timely detect that the positive electrode of a direct current power supply of the control circuit is connected with a protection tripping relay contact, then go to a protection tripping outlet pressing plate, then go to an external locking tripping contact, then go to a tripping holding relay, then go to a breaking monitoring circuit and effectively monitor the integrity of connecting wires and elements between the contacts 3, and further timely take processing measures to ensure the safety and reliability of the protection tripping circuit of the circuit breaker.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a monitoring loop of a protection tripping loop and a broken line signal loop of the protection tripping loop, which solve the problems that in the prior art, a breaking monitoring loop of a breaker only can monitor the negative pole of a direct current power supply of a control circuit to a tripping coil of the breaker, then to an auxiliary switch contact of the breaker, and finally to a connecting line element between a breaking monitoring loop and a contact 3 and whether the direct current power supply fails; the positive pole of the control loop dc power supply cannot be connected to the protection trip relay contact, to the protection trip outlet pressure plate, to the external latching trip contact, to the trip hold relay, to the split brake monitoring loop and to the connection lines between the contacts 3 and the integrity of the components.
In order to achieve the above purpose, the present application provides the following technical solutions: a monitoring circuit for a protection trip circuit, comprising: the voltage relay coil is connected with a protection resistor in series and is connected with two ends of a tripping outlet contact of the protection device in parallel;
and a normally-open contact of the normally-closed contact series-connection switching-on position relay of the voltage relay is connected into a signal switching-on loop of the protection measurement and control device to form a broken signal loop of the protection tripping loop.
In an alternative way, the auxiliary switch contact of the circuit breaker is in a closed state in a circuit breaker closing state and is in an open state in a circuit breaker opening state.
In an alternative mode, if the circuit breaker is in a closing position and the positive electrode of the direct current power supply of the control loop is connected with the contact of the protective tripping relay, the circuit breaker is connected to the protective tripping outlet pressing plate, the external tripping maintaining relay, the normally closed auxiliary contact of the voltage relay is closed when the connecting wire and the element between the switching-off monitoring loop and the contact 3 are in failure, the normally open auxiliary contact of the relay is closed in the closing position, and the signal loop is conducted to send out a circuit breaking signal of the protective tripping loop.
In an alternative mode, if the circuit breaker is in a breaking position, an auxiliary switch contact of the circuit breaker is opened, a protection tripping circuit is in a normal breaking state, a voltage relay is not electrified, a closing position relay is not electrified, a normally closed contact of the voltage relay is closed, a normally open contact of the closing position relay is opened, a signal circuit is not conducted, and a protection tripping circuit breaking signal is not sent out by mistake; when the circuit breaker is in a closing position and the protective tripping circuit is intact, the voltage relay is electrified, the closing position relay is electrified, the normally closed auxiliary contact of the voltage relay is opened, the normally open auxiliary contact of the closing position relay is closed, the signal circuit is not conducted, and a protective tripping circuit breaking signal is not sent.
In an alternative, the voltage relay is a large resistance coil relay.
According to the technical scheme, the application provides a monitoring loop of a protection tripping loop, which comprises the following components: the voltage relay coil is connected with a protection resistor in series and is connected with two ends of a tripping outlet contact of the protection device in parallel.
A protection trip circuit disconnect signal circuit comprising: the normally closed contact of the voltage relay is connected in series with the normally open contact of the closing position relay, and is connected into a protection measurement and control device signal opening loop to form the protection tripping loop disconnection signal loop.
In the practical application process, when the circuit breaker normally operates and is in a closing position, the positive electrode of the control loop direct current power supply is connected with a protective tripping relay contact, then goes to a protective tripping outlet pressing plate, then goes to an external locking tripping contact, then goes to a tripping maintaining relay, then goes to a breaking monitoring loop, and the connecting wire and the element between the connecting points 3 are failed, at the moment, if a short circuit fault occurs on line and load side equipment, the circuit breaker cannot perform protective action tripping, and the fault point is tripped and disconnected by the upper circuit breaker, so that large-area power loss is caused, and the loss is serious. Therefore, operation and maintenance personnel can judge whether the protection tripping circuit breaks down or not through the protection tripping circuit breaking signal, fault information is further processed rapidly, and the expansion of the accident range is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a monitoring circuit of a protection trip circuit provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a circuit connection of a protection trip circuit broken signal circuit according to an embodiment of the present application.
In the figure, YJ-voltage relay, ZK 1-DC power supply is empty-on, KM1+ -DC power supply +110V, KM1-DC power supply-110V, TJ 1-protection trip relay contact, TBJ-trip hold relay contact, TBJ-trip hold relay, HWJ-closing position relay, LED lamp-light emitting diode, DL-breaker auxiliary switch contact, TQ-breaker trip coil, TYJ 1-external latching trip contact, R1-protection resistor, 1 n-measurement and control device, ZK 2-air switch, XD+ -remote signaling power supply +110V, XD-remote signaling power supply-110V, YJ 1-voltage relay auxiliary contact, HWJ-closing position relay contact.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In order to solve the problem in the prior art, a breaking monitoring loop of the circuit breaker can only monitor whether a direct current power supply negative electrode of a control circuit reaches a tripping coil of the circuit breaker, then reaches an auxiliary switch contact of the circuit breaker, and finally reaches a connecting wire and an element between a breaking monitoring loop and a contact 3 and whether the direct current power supply fails or not; the protection trip relay contact can not be connected to the control loop direct current power supply positive electrode, then the protection trip outlet pressing plate, then the external locking trip contact, then the trip holding relay, and then the opening monitoring loop and the integrity of connecting wires and elements between the contacts 3 are effectively monitored.
Referring to fig. 1, a schematic diagram of a monitoring circuit of a protection trip circuit according to an embodiment of the present application is provided, where the monitoring circuit of the protection trip circuit includes: voltage relay coil YJ and protection resistor R1. The voltage relay coil YJ is connected in series with a protection resistor R1 and is connected in parallel to two ends of a tripping outlet contact TJ1 of the protection device;
the monitored loop is: the positive pole of the direct current power supply is connected with the protection tripping relay electric shock TJ1, the protection tripping relay electric shock TJ1 is connected with the protection tripping outlet pressing plate, the protection tripping outlet pressing plate is connected with the external locking tripping contact TYJ1, and the external locking tripping contact TYJ1 is connected with a loop of the tripping holding relay TBJ.
Normally closed auxiliary contact YJ1 of the voltage relay is connected in series with normally open auxiliary contact HWJ1 of the switching-on position relay in a signal switching-in loop of the protection and measurement control device to form a circuit breaking signal loop of the protection tripping circuit.
In the practical application process, when the breaker normally operates, the auxiliary normally open contact DL of the breaker is closed, when a short circuit fault occurs in a circuit and load equipment, the protective tripping relay contact TJ1 in the protective device is closed, a protective tripping circuit of the breaker is closed, the tripping coil TQ of the breaker is electrified, the breaking electromagnet acts to drive the operating mechanism to act, the protective tripping of the breaker is realized, and the breaker is opened to cut off fault current.
The voltage relay coil YJ is connected with the positive electrode of the direct current power supply in series, a protection resistor R1 is connected in parallel to two ends of a tripping outlet contact of the protection device, the protection resistor R1 is connected with the tripping outlet pressing plate in series, the tripping outlet pressing plate is connected with the tripping holding relay TBJ in series, the tripping holding relay TBJ is connected with the auxiliary switch contact DL of the circuit breaker in series, the auxiliary switch contact DL of the circuit breaker is connected with the tripping coil TQ of the circuit breaker in series, and the tripping coil TQ of the circuit breaker is connected with the negative electrode of the direct current power supply. The monitoring loop of the protection tripping loop is formed by connecting the voltage relay coil in series with a protection resistor and connecting the protection resistor in parallel with two ends of a tripping outlet contact of the protection device; the monitored loop is formed by connecting a normally-open contact of a normally-closed contact series-connection switching-on position relay of a voltage relay into a signal switching-on loop of a protection measurement and control device.
When the protection tripping outlet pressing plate, the tripping holding relay TBJ, the breaker auxiliary switch contact DL, the breaker tripping coil TQ and the direct-current power supply are all fault-free, and at the moment, due to the voltage dividing effect of the voltage relay YJ, the voltage relay YJ needs to be explained, the resistance of the switching-off coil is far smaller than that of the voltage relay YJ, the voltage obtained by the breaker tripping coil TQ is very low and far lower than the starting voltage of the breaker tripping coil, and therefore the switching-off operation of the breaker cannot be initiated.
If the protection tripping circuit fails, namely, the protection tripping outlet pressing plate, the tripping holding relay TBJ, the external locking tripping contact TYJ1, the auxiliary breaker contact DL and the breaker tripping coil TQ, any element in the direct-current power supply or a connecting line between the elements fail, the protection tripping circuit of the breaker is incomplete, and at the moment, if the circuit and load side equipment are in short circuit failure, the breaker cannot perform protection tripping, and the fault point is tripped and disconnected by the upper-level breaker, so that large-area power loss is caused, and the loss is serious. The operation and maintenance personnel can timely check and process the broken line fault of the protection tripping circuit according to whether the part of the protection tripping circuit sends out the broken line signal, so that the expansion of the accident range is avoided.
In some embodiments of the present application, the auxiliary switch contact DL of the circuit breaker is in a closed state of the circuit breaker, that is, when the circuit breaker is operating normally, the auxiliary switch contact DL of the circuit breaker is in a closed state, and the auxiliary switch contact DL of the circuit breaker is in an open state of the circuit breaker.
In some embodiments of the present application, if the circuit breaker is in a closing position and a portion of the protection trip circuit is broken, a protection trip circuit breaking signal is sent, where the portion of the protection trip circuit refers to that the positive pole of the dc power supply is connected to the protection trip relay contact TJ1, the protection trip relay contact TJ1 is connected in series to the protection trip outlet pressing plate, the protection trip outlet pressing plate is connected in series to the external latching trip contact TYJ1, the external latching trip contact TYJ1 is connected in series to the trip hold relay TBJ, and the trip hold relay is connected to the line of point No. 3.
Referring to fig. 2, for a schematic diagram of a circuit connection of a circuit breaking signal circuit of a protection trip circuit provided in an embodiment of the present application, when a circuit breaker is in a breaking position, no monitoring of the protection trip circuit is needed, because the circuit breaker is in the breaking position, an auxiliary switch contact DL of the circuit breaker is in an open state, in the diagram, a voltage relay YJ and a closing position relay HWJ are not electrified, a normally closed auxiliary contact YJ1 of the voltage relay is closed, a normally open auxiliary contact HWJ1 of the closing position relay is opened, the circuit breaking signal circuit of the protection trip circuit is not conducted and is not signaled, and the circuit breaker is prevented from sending a circuit breaking signal of the protection trip circuit by mistake when in the breaking position.
When the circuit breaker is in a closing position and the protection tripping circuit is in good condition, a voltage relay YJ and a closing position relay HWJ are electrified in the drawing, a normally closed auxiliary contact YJ1 of the voltage relay is opened, a normally open auxiliary contact HWJ1 of the closing position relay is closed, and the protection tripping circuit breaking signal circuit is not conducted and does not signal.
When the circuit breaker is at a closing position and part of the protection tripping circuit is broken, namely the positive electrode of the direct current power supply is connected with the protection tripping relay contact TJ1, the protection tripping relay contact TJ1 is connected with the protection tripping outlet pressing plate in series, the protection tripping outlet pressing plate is connected with the external locking tripping contact TYJ1 in series, the external locking tripping contact TYJ1 is connected with the tripping holding relay TBJ in series, when a broken line condition occurs in a line from the tripping holding relay to a point 3, the voltage relay YJ is not electrified, the closing position relay HWJ is electrified, the normally closed auxiliary contact YJ1 of the voltage relay is closed, the normally open auxiliary contact HWJ1 of the closing position relay is closed, and the protection tripping circuit broken line signal loop is conducted to send out a protection tripping circuit broken line signal. And the operation and maintenance personnel timely check and process the disconnection fault of the protection tripping circuit according to whether the protection tripping circuit sends out a disconnection signal.
In some embodiments of the present application, the voltage relay is a large resistance coil relay.
After a voltage relay YJ coil is connected in series with a protection resistor R1 in parallel and connected to two ends of a tripping outlet contact of the protection device, the current passing through the tripping coil can be increased during normal operation, so that the voltage relay YJ selects a relay with large coil resistance as much as possible, at the moment, the current increment through the tripping coil is very small, and the tripping coil cannot be burnt out and tripped by misoperation during normal operation. A voltage relay YJ coil is connected in series with a protection resistor R1 in parallel to be connected to two ends of a tripping outlet contact of a protection device, and the protection resistor R1 is used for limiting current flowing through the tripping coil when the voltage relay is burnt out and preventing the current flowing through the tripping coil after the voltage relay YJ coil is burnt out from being overlarge after short circuit occurs, so that the breaker is opened by mistake.
In summary, the present application provides a monitoring circuit of a protection trip circuit, in which the voltage relay coil YJ is connected in series with a protection resistor R1 and connected in parallel to two ends of a trip outlet contact of a protection device; and the normally-closed auxiliary contact of the voltage relay is connected in series with the normally-open auxiliary contact of the relay at the closing position, and is arranged in the protection measurement and control device signal opening loop.
In the practical application process, when the circuit breaker normally operates and is in a closing position, the positive electrode of the control loop direct current power supply is connected with a protective tripping relay contact, then goes to a protective tripping outlet pressing plate, then goes to an external locking tripping contact, then goes to a tripping maintaining relay, then goes to a breaking monitoring loop, and the connecting wire and the element between the connecting points 3 are failed, at the moment, if a short circuit fault occurs on line and load side equipment, the circuit breaker cannot perform protective action tripping, and the fault point is tripped and disconnected by the upper circuit breaker, so that large-area power loss is caused, and the loss is serious. Therefore, operation and maintenance personnel can judge whether the protection tripping circuit breaks down or not through the protection tripping circuit breaking signal, fault information is further processed rapidly, and the expansion of the accident range is avoided.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. A monitoring circuit for a protection trip circuit, comprising: the voltage relay coil is connected with a protection resistor in series and is connected with two ends of a tripping outlet contact of the protection device in parallel;
and a normally-open contact of the normally-closed contact series-connection switching-on position relay of the voltage relay is connected into a signal switching-on loop of the protection measurement and control device to form a broken signal loop of the protection tripping loop.
2. The monitoring circuit of claim 1, wherein the circuit breaker auxiliary switch contacts are in a closed state in a circuit breaker closed state and are in an open state in a circuit breaker open state.
3. The monitoring circuit of claim 1, wherein the protection measurement and control device sends a protection trip circuit disconnection signal if the circuit breaker is in a closed position and a portion of the protection trip circuit is disconnected.
4. A monitoring circuit for a protection trip circuit according to claim 3 wherein if the circuit breaker is in the open position, the circuit breaker auxiliary switch contacts are open, the protection trip circuit is in a normally open state, the voltage relay is not energized, the closing position relay is not energized, the voltage relay normally closed contacts are closed, the closing position relay normally open contacts are open, the signal circuit is not conductive, and the protection trip circuit open signal is not misemitted;
when the circuit breaker is in a closing position and the protective tripping circuit is intact, the voltage relay is electrified, the closing position relay is electrified, the normally closed auxiliary contact of the voltage relay is opened, the normally open auxiliary contact of the closing position relay is closed, the signal circuit is not conducted, and a protective tripping circuit breaking signal is not sent.
5. The protection trip circuit monitoring circuit of claim 1 wherein said voltage relay is a high resistance coil relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320114836.9U CN219016479U (en) | 2023-01-20 | 2023-01-20 | Monitoring circuit for protecting tripping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320114836.9U CN219016479U (en) | 2023-01-20 | 2023-01-20 | Monitoring circuit for protecting tripping circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219016479U true CN219016479U (en) | 2023-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320114836.9U Active CN219016479U (en) | 2023-01-20 | 2023-01-20 | Monitoring circuit for protecting tripping circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219016479U (en) |
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2023
- 2023-01-20 CN CN202320114836.9U patent/CN219016479U/en active Active
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