CN117970008A - Tripping and closing loop monitoring system and method for relay protection device - Google Patents

Abstract

The application relates to a tripping and closing loop monitoring system and a tripping and closing loop monitoring method of a relay protection device, wherein the tripping and closing loop monitoring system of the relay protection device comprises the following components: the circuit comprises a tripping circuit, a closing circuit, a first conversion circuit, a first optical coupler, a second conversion circuit, a second optical coupler and a control circuit, wherein the first conversion circuit is used for performing voltage conversion of a protection action outlet of the tripping circuit; the second conversion circuit is used for performing voltage conversion of a reclosing action outlet of the closing loop; the control circuit is respectively connected with the second end of the first optical coupler and the second end of the second optical coupler and is used for determining whether the tripping circuit is normal or not according to the level signal output by the first optical coupler and determining whether the closing circuit is normal or not according to the level signal output by the second optical coupler. The relay protection device tripping and closing loop monitoring system can realize the online monitoring of the relay protection device tripping and closing loop, and has simple structure and low cost.

Description

Tripping and closing loop monitoring system and method for relay protection device

Technical Field

The application relates to the technical field of relay protection, in particular to a tripping and closing loop monitoring system and method of a relay protection device.

Background

In actual operation of relay protection, hidden faults of abnormal disconnection of the tripping and closing circuit caused by loosening of a terminal strip connection of a protection screen, breakage of a back plate terminal of an outlet pressing plate, falling of a connecting bolt and a binding post, virtual connection of the outlet pressing plate and the like can occur in the relay protection tripping circuit and the closing circuit. The hidden faults occur in the screen cabinet, and can not be observed by daily inspection of operators, so that the hidden faults can be found when the power grid faults and relay protection refuses to operate, and the safe operation reliability of the power grid is seriously threatened.

Although the traditional outlet pressure plate monitoring device based on the detection principle of the direct current electric field sensor can monitor the conduction condition of the tripping and closing loop outlet pressure plate, the position node of the circuit breaker and the like, an outlet monitoring system is usually required to be configured, and the cost is high.

Disclosure of Invention

Based on the above, it is necessary to provide a tripping and closing loop monitoring system and method for a relay protection device with low cost.

In a first aspect, the present application provides a tripping and closing loop monitoring system of a relay protection device, including: the tripping circuit, the closing circuit, the first conversion circuit, the first optical coupler, the second conversion circuit, the second optical coupler and the control circuit, wherein,

The first conversion circuit is respectively connected with the protection action outlet of the tripping circuit and the first end of the first optical coupler and is used for performing voltage conversion of the protection action outlet of the tripping circuit;

The second conversion circuit is respectively connected with the reclosing action outlet of the switching-on loop and the first end of the second optical coupler and is used for performing voltage conversion of the reclosing action outlet of the switching-on loop;

The control circuit is respectively connected with the second end of the first optical coupler and the second end of the second optical coupler and is used for determining whether the tripping circuit is normal or not according to the level signal output by the first optical coupler and determining whether the closing circuit is normal or not according to the level signal output by the second optical coupler.

In one embodiment, the control circuit is configured to:

When the protection action outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the first optical coupler outputs a high-level signal, or when the protection action of the relay protection device trips to the circuit breaker in a breaking state and the first optical coupler outputs a low-level signal, determining that the tripping circuit is normal;

and determining that the tripping circuit is abnormal when the protection action of the relay protection device is tripped to the state that the circuit breaker is in a breaking state and the first optocoupler outputs a high-level signal.

In one embodiment, the control circuit is further configured to:

When the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, or when the reclosing action of the relay protection device is to the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, determining that the closing loop is normal;

and determining that the closing loop is abnormal when the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the second optical coupler outputs a high-level signal, or when the reclosing action of the relay protection device is in a closing state and the circuit breaker outputs a high-level signal.

In one embodiment, the trip circuit includes a closing position relay, a DL normally open contact, a protection trip platen, and a trip coil, wherein,

The first end of the switching-on position relay is respectively connected with the positive electrode of the control power supply, the first end of the protection tripping contact and the first input end of the first conversion circuit, the second end of the switching-on position relay is respectively connected with the first end of the DL normally open contact and the second end of the protection tripping pressing plate, the second end of the first conversion circuit is respectively connected with the second end of the protection tripping contact and the first end of the protection tripping pressing plate, the first end of the tripping coil is connected with the second end of the DL normally open contact, and the second end of the tripping coil is connected with the negative electrode of the control power supply;

when the protective action outlet of the relay protection device is in an open state, the circuit breaker is in a close state and the tripping circuit is normal, the DL normally open contact is closed;

And under the condition that the protective action outlet of the relay protection device is in an open state, the circuit breaker is in a breaking state and the tripping circuit is normal, the DL normally open contact is opened.

In one embodiment, the switching-on loop comprises a switching-off position relay, a DL normally closed contact, a reclosing pressing plate and a switching-on coil, wherein,

The first end of the switching-off position relay is respectively connected with the positive electrode of the control power supply, the first end of the reclosing contact and the first input end of the second conversion circuit, the second end of the switching-off position relay is respectively connected with the first end of the DL normally closed contact and the second end of the reclosing pressing plate, the second end of the second conversion circuit is respectively connected with the second end of the reclosing contact and the first end of the reclosing pressing plate, the first end of the closing coil is connected with the second end of the DL normally closed contact, and the second end of the closing coil is connected with the negative electrode of the control power supply;

When the reclosing outlet of the relay protection device is in an open state and the circuit breaker is in a closed state, the DL normally-closed contact is disconnected;

and when the reclosing outlet of the relay protection device is in an open state and the circuit breaker is in a breaking state, the DL normally-closed contact is closed.

In one embodiment, the first end of the first optocoupler includes a positive input and a negative input;

The first conversion circuit includes:

One end of the first positive voltage conversion circuit is connected with the positive terminal of the protection action outlet of the tripping circuit, and the other end of the first positive voltage conversion circuit is connected with the positive input end of the first optical coupler and is used for completing the positive voltage conversion of the protection action outlet of the tripping circuit;

and one end of the first negative voltage conversion circuit is connected with the negative electrode terminal of the protection action outlet of the tripping circuit, and the other end of the first negative voltage conversion circuit is connected with the negative electrode input end of the first optical coupler and is used for completing the negative voltage conversion of the protection action outlet of the tripping circuit.

In one embodiment, the scheduling master station is connected with the control circuit and is used for outputting an alarm signal under the condition that any one of the tripping circuit and the closing circuit is abnormal.

In a second aspect, the present application further provides a method for monitoring a tripping and closing loop of a relay protection device, which is applied to the tripping and closing loop monitoring system of the relay protection device in any embodiment, and the method includes:

acquiring the current state of the relay protection device, the current state of the circuit breaker, a level signal of the first optical coupler and a level signal of the second optical coupler;

Determining whether the tripping circuit is normal or not according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the first optical coupler;

And determining whether the closing loop is normal or not according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the second optical coupler.

In one embodiment, the determining whether the trip circuit is normal according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the first optical coupler includes:

When the protection action outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the first optical coupler outputs a high-level signal, or when the protection action of the relay protection device trips to the circuit breaker in a breaking state and the first optical coupler outputs a low-level signal, determining that the tripping circuit is normal;

and determining that the tripping circuit is abnormal when the protection action of the relay protection device is tripped to the state that the circuit breaker is in a breaking state and the first optocoupler outputs a high-level signal.

In one embodiment, the determining whether the closing loop is normal according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the second optical coupler includes:

When the reclosing outlet of the relay protection device is in an open state and the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, or when the reclosing action of the relay protection device is performed until the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, determining that the closing loop is normal;

And determining that the closing loop is abnormal when the reclosing outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the second optical coupler outputs a high-level signal, or when the reclosing action of the relay protection device is performed until the circuit breaker is in a closing state and the second optical coupler outputs a high-level signal.

In the relay protection device tripping and closing loop and the relay protection device tripping and closing loop monitoring method, the relay protection device tripping and closing loop monitoring system comprises a tripping loop, a closing loop, a first conversion circuit, a first optical coupler, a second conversion circuit, a second optical coupler and a control circuit. The high voltage of the tripping circuit protection action outlet is converted into low voltage through the first conversion circuit, and the low voltage is provided for the first optical coupler, so that the situation that the circuit breaker trips by mistake due to the overlarge working power of the first optical coupler can be avoided; the high voltage at the reclosing action outlet of the switching-on loop is converted into low voltage through the second conversion circuit and is output to the second optical coupler, so that the situation that the circuit breaker is switched on by mistake due to the fact that the working power of the second optical coupler is too high can be avoided; further, the first optical coupler outputs a level signal to the control circuit based on the input voltage provided by the first conversion circuit, so that the control circuit can determine whether the tripping circuit is normal or not according to the level signal, and the on-line monitoring of the tripping circuit is realized; the second optical coupler outputs the level signal control circuit based on the input voltage provided by the second conversion circuit, so that the control circuit can determine whether the switching-on loop is normal or not according to the level signal of the second optical coupler, and the on-line monitoring of the switching-on loop is realized. In addition, the tripping and closing loop monitoring system of the relay protection device is simple in structure, does not need an additional outlet monitoring device, and is low in cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram illustrating a structure of a tripping and closing loop monitoring system of a relay protection device according to an embodiment;

fig. 2 is a schematic diagram of the structure of a trip circuit and a closing circuit in an embodiment;

Fig. 3 is a schematic diagram of the structure of a trip circuit and a closing circuit in another embodiment;

FIG. 4 is a schematic diagram illustrating a circuit monitoring system for tripping and closing a relay protection device according to another embodiment;

FIG. 5 is a flowchart of a method for monitoring tripping and closing loops of a relay protection device according to an embodiment.

Reference numerals illustrate:

100-trip circuit, 200-closing circuit, 300-first conversion circuit, 400-first optocoupler, 500-second conversion circuit, 600-second optocoupler, 700-control circuit.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first optocoupler may be referred to as a second optocoupler, and similarly, a second optocoupler may be referred to as a first optocoupler, without departing from the scope of this disclosure. Both the first optocoupler and the second optocoupler are optocouplers, but they are not identical optocouplers.

It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Meanwhile, the term "and/or" as used in the present specification includes any and all combinations of the items listed in association therewith.

In one embodiment, as shown in fig. 1, a relay protection device tripping and closing circuit 200 monitoring system is provided, which includes a tripping circuit 100, a closing circuit 200, a first conversion circuit 300, a first optocoupler 400, a second conversion circuit 500, a second optocoupler 600 and a control circuit 700. The first conversion circuit 300 is connected to the protection operation outlet of the trip circuit 100 and the first end of the first optocoupler 400, the second conversion circuit 500 is connected to the reclosing operation outlet of the closing circuit 200 and the first end of the second optocoupler 600, and the control circuit 700 is connected to the second end of the first optocoupler 400 and the second end of the second optocoupler 600.

The protection action outlet of the trip circuit 100 refers to the line contacts at two ends of the outlet relay in the trip circuit 100, and the reclosing action outlet of the closing circuit 200 refers to the line contacts at two ends of the outlet relay in the closing circuit 200.

The first switching circuit 300 may perform voltage switching of the protection action outlet of the trip circuit 100. Illustratively, the voltages across the protection action outlet of the trip circuit 100 are +110V and-110V, respectively, and the first conversion circuit 300 may convert the +110V voltage to +24V, +12v, etc., and may convert the-110V voltage to-24V, -12V, etc. The second conversion circuit 500 may perform voltage conversion of the reclosing operation exit of the closing circuit 200. For example, the voltages at the two ends of the reclosing action outlet of the closing circuit 200 are +110v and-110V, respectively, and the second converting circuit 500 can convert the +110v voltage into +24v, +12v, and the like, and convert the-110V voltage into-24V, -12v, and the like. The control circuit 700 may determine whether the trip circuit 100 is normal according to the level signal of the first photo coupler 400 and determine whether the closing circuit 200 is normal according to the level signal of the second photo coupler 600.

In an embodiment of the present application, the relay protection device tripping and closing circuit 200 monitoring system includes a trip circuit 100, a closing circuit 200, a first conversion circuit 300, a first optocoupler 400, a second conversion circuit 500, a second optocoupler 600 and a control circuit 700. The high voltage of the protection action outlet of the tripping circuit 100 is converted into low voltage by the first conversion circuit 300, and the low voltage is provided for the first optocoupler 400, so that the situation that the circuit breaker trips by mistake due to the overlarge working power of the first optocoupler 400 can be avoided; the second conversion circuit 500 converts the high voltage of the reclosing action outlet of the switching-on loop 200 into low voltage and outputs the low voltage to the second optocoupler 600, so that the situation that the circuit breaker is switched on by mistake due to the overlarge working power of the second optocoupler 600 can be avoided; further, the first optocoupler 400 outputs a level signal to the control circuit 700 based on the input voltage provided by the first conversion circuit 300, so that the control circuit 700 can determine whether the trip circuit 100 is normal according to the level signal, thereby realizing on-line monitoring of the trip circuit 100; the second optocoupler 600 outputs the level signal control circuit 700 based on the input voltage provided by the second conversion circuit 500, so that the control circuit 700 can determine whether the closing circuit 200 is normal according to the level signal of the second optocoupler 600, thereby realizing online monitoring of the closing circuit 200. In addition, the tripping and closing loop 200 monitoring system of the relay protection device has a simple structure, does not need an additional outlet monitoring device, and has low cost.

In one embodiment, as shown in fig. 2, the trip circuit 100 includes a closing position relay Q1, a DL normally open contact S2, a protection trip contact S1, and a trip coil L1. The first end of the switching-on position relay Q1 is respectively connected with the positive electrode of the control power supply, the first end of the protection tripping contact S1 and the first input end of the first conversion circuit 300, the second end of the switching-on position relay Q1 is respectively connected with the first end of the DL normally open contact S2, the second end of the protection tripping contact S1 and the second input end of the first conversion circuit 300, the first end of the tripping coil L1 is connected with the second end of the DL normally open contact S2, and the second end of the tripping coil L1 is connected with the negative electrode of the control power supply.

The closing circuit 200 includes a breaking position relay Q2, a DL normally closed contact S4, a reclosing contact S3, and a closing coil L2. The first end of the switching-off position relay Q2 is respectively connected with the positive electrode of the control power supply, the first end of the reclosing contact S3 and the first input end of the second conversion circuit 500, the second end of the switching-off position relay Q2 is respectively connected with the first end of the DL normally-closed contact S4, the second end of the reclosing contact S3 and the second input end of the second conversion circuit 500, the first end of the closing coil L2 is connected with the second end of the DL normally-closed contact S4, and the second end of the closing coil L2 is connected with the negative electrode of the control power supply.

When the tripping contact S1 of the relay protection device is in an open state and the circuit breaker is in a close state, the DL normally open contact S2 is closed, the tripping coil L1 is electrified, the DL normally closed contact S4 is opened, the closing position relay Q1 acts, the opening position relay Q2 does not act, and the relay protection device is allowed to trip. When the reclosing contact S3 of the relay protection device is in an open state and the circuit breaker is in a separated state, the DL normally-open contact S2 is opened, the DL normally-closed contact S4 is closed, the closing coil L2 is electrified, the closing position relay Q1 does not act, and the separated position relay Q2 acts, so that reclosing of the relay protection device is allowed. The protection trip contact S1 assumes a normally open state, and the protection trip contact S1 is closed only after the relay protection device performs a protection action. The reclosing contact S3 is in a normally open state, and the reclosing contact S3 is closed only when the reclosing contact S3 is overlapped after the relay protection device trips.

It should be noted that, in the embodiment of the present application, the protection action outlet of the trip circuit 100 is the protection of the two-end lines of the trip contact S1, and the protection action outlet of the closing circuit 200 is the reclosing contact S3.

Optionally, in some embodiments, as shown in fig. 3, the trip circuit 100 further includes a trip clamp plate S5, wherein a first end of the trip clamp plate S5 is connected to the protection trip contact S1 and the first conversion circuit 300, respectively, and a second end of the trip clamp plate S5 is connected to the switch-on position relay Q1 and the DL normally open contact S2, respectively. Under normal conditions of the trip circuit 100, the trip clamp plate S5 should be thrown regardless of whether the circuit breaker is in the closed state or the open state.

The switch-on circuit 200 further includes a reclosing pressing plate S6, where a first end of the reclosing pressing plate S6 is connected to the reclosing contact S3 and the second switching circuit 500, and a second end of the reclosing pressing plate S6 is connected to the switching-off position relay Q2 and the DL normally-closed contact S4. Under normal conditions of the closing circuit 200, the reclosing hold-down S6 should be put in regardless of whether the circuit breaker is in the closed state or the open state.

Further, the control circuit may determine that the trip circuit is normal in a case where the circuit breaker is in a closed state and the first optocoupler outputs a high level signal. The control circuit determines that the trip circuit is abnormal under the condition that the circuit breaker is in a closing state and the first optocoupler outputs a low-level signal.

As shown in fig. 4, when the circuit breaker is in a closed state, a DL normally open contact S2 in the trip circuit 100 is closed, the two input ends of the first conversion circuit 300 respectively input a +110v voltage and a-110V voltage, the first conversion circuit 300 converts the +110v voltage into a lower voltage and outputs the lower voltage to the positive input end of the first optocoupler 400, the-110V voltage is converted into a lower voltage and then outputs the lower voltage to the negative input end of the first optocoupler 400, the first optocoupler 400 is turned on, and a high-level signal is output to the control circuit 700. If any abnormal conditions such as loose connection of the trip pressing plate, falling of the connecting terminal, disconnection of the DL normally open contact, falling of the trip coil and the like exist in the trip circuit 100, the protection action outlet of the trip circuit 100 will not have negative voltage, the first conversion circuit 300 will not naturally output negative voltage to the negative input end of the first optocoupler 400, the first optocoupler 400 is turned off, and a low level signal is output to the control circuit 700.

Accordingly, the control loop 700 may determine that the trip loop 100 is normal in a case where the circuit breaker is in a closed state and the first photo coupler 400 outputs a high level signal; in the case where the circuit breaker is in a closed state and the first photo coupler 400 outputs a low level signal, it is determined that the trip circuit 100 is abnormal.

Alternatively, the control circuit may determine that the trip circuit is normal in a case where the circuit breaker is in the open state and the first optocoupler outputs a low level signal. The control circuit determines that the trip circuit is abnormal when the circuit breaker is in a breaking state and the first optocoupler outputs a high level signal.

When the circuit breaker is in the open state, the DL normally open contact S2 is opened, the switch-on position relay Q1 is opened, the trip circuit 100 is not turned on, the branch circuit formed by the trip pressing plate S5 and the first conversion circuit 300 is opened, the first optocoupler 400 is not turned on, and the control circuit 700 receives a low level signal. If the control circuit 700 receives a high signal, an abnormality in the trip circuit 100 is indicated.

In one embodiment, the control circuit determines that the closing loop is normal when the circuit breaker is in a closing state and the second optocoupler outputs a low level signal. And the control circuit determines that the switching-on loop is abnormal under the condition that the circuit breaker is in a switching-on state and the second optical coupler outputs a high-level signal.

With continued reference to fig. 4, when the circuit breaker is in a closed state, the DL normally-closed contact S4 in the closing circuit 200 is opened, the opening position relay Q2 is opened, the closing circuit 200 is not turned on, the branch circuit formed by the reclosing pressure plate S6 and the second switching circuit 500 is opened, and the second optocoupler 600 is not turned on, and at this time, the control circuit 700 receives a low level signal. If the control circuit 700 receives a high signal, it indicates that the closing circuit is abnormal.

Optionally, the control circuit determines that the closing loop is normal when the circuit breaker is in a switching-off state and the second optocoupler outputs a high-level signal. The control circuit determines that the closing loop is abnormal under the condition that the circuit breaker is in a switching-off state and the second optical coupler outputs a low-level signal.

When the circuit breaker is in the opening state, the DL normally closed contact S4 is closed, the closing coil L2 is electrified, the voltage at two ends of the reclosing action outlet of the closing circuit 200 has a voltage difference, after the voltage conversion by the second conversion circuit 500, the input voltages at the positive input end and the negative input end of the second optocoupler 600 have a voltage difference, the second optocoupler 600 is turned on, and a high-level signal is output to the control circuit 700. Therefore, if the control circuit 700 receives the high level signal output from the second optocoupler 600, it indicates that the switching-on loop 200 is normal; if the control circuit 700 receives the low level signal output from the second optocoupler 600, it indicates that the closing circuit 200 is abnormal.

In one embodiment, the first conversion circuit includes a first positive voltage conversion circuit and a first negative voltage conversion circuit. The first end of the first optocoupler includes a positive input and a negative input.

One end of the first positive voltage conversion circuit is connected with the positive terminal of the protection action outlet of the tripping circuit, and the other end of the first positive voltage conversion circuit is connected with the positive input end of the first optical coupler and is used for completing the positive voltage conversion of the protection action outlet of the tripping circuit. And one end of the first negative voltage conversion circuit is connected with the negative electrode terminal of the protection action outlet of the tripping circuit, and the other end of the first negative voltage conversion circuit is connected with the negative electrode input end of the first optical coupler and is used for completing the negative voltage conversion of the protection action outlet of the tripping circuit.

The first positive voltage conversion circuit and the first negative voltage conversion circuit may employ a voltage regulator, a voltage step-down circuit, or the like. The first positive voltage conversion circuit can convert the voltage of +110V into low voltage, and the first negative conversion circuit can convert the voltage of-110V into low voltage, so that the power of the first optocoupler during operation is reduced, and the circuit breaker is prevented from tripping by mistake.

In one embodiment, the first input of the second optocoupler includes a positive input and a negative input.

The second conversion circuit includes a second positive voltage conversion circuit and a second negative voltage conversion circuit.

One end of the second positive voltage conversion circuit is connected with the positive terminal of the reclosing action outlet of the switching-on loop, and the other end of the second positive voltage conversion circuit is connected with the positive input end of the second optical coupler and is used for completing positive voltage conversion of the reclosing action outlet of the switching-on loop. One end of the second negative voltage conversion circuit is connected with a negative electrode terminal of a reclosing action outlet of the switching-on loop, and the other end of the second negative voltage conversion circuit is connected with an input negative electrode input end of the second optical coupler and is used for completing negative voltage conversion of the reclosing action outlet of the switching-on loop.

The second positive voltage conversion circuit and the second negative voltage conversion circuit may employ a voltage regulator, a step-down circuit, or the like. The second positive voltage conversion circuit can convert the voltage of +110V into low voltage, and the second negative conversion circuit can convert the voltage of-110V into low voltage, so that the power of the second optocoupler during working is reduced, and the circuit breaker is prevented from being switched on by mistake.

In one embodiment, the relay protection device tripping and closing loop monitoring system further comprises a dispatching master station. The dispatching master station is connected with the control circuit and can be used for outputting an alarm signal under the condition that any one of the tripping circuit and the closing circuit is abnormal.

It can be understood that when the control circuit determines that the tripping circuit is abnormal, a corresponding control signal is output to the dispatching master station, so that the dispatching master station outputs a corresponding alarm signal to prompt on-site operation and maintenance personnel that the tripping circuit is abnormal, and the tripping circuit can be repaired in time, and the refusal of the circuit breaker is avoided. When the control circuit determines that the closing loop is abnormal, a corresponding control signal is also output to the dispatching master station, so that the dispatching master station outputs a corresponding alarm signal to prompt on-site operation and maintenance personnel that the closing loop is abnormal, the closing loop can be repaired in time, and the refusal of the circuit breaker is avoided.

In an embodiment, the application further provides a tripping and closing loop monitoring method of the relay protection device, which can be applied to the tripping and closing loop monitoring system of the relay protection device provided by any embodiment. As shown in FIG. 5, the tripping and closing loop monitoring method of the relay protection device comprises steps S502-S506.

S502, acquiring the current state of the relay protection device, the current state of the circuit breaker, the level signal of the first optical coupler and the level signal of the second optical coupler.

The current state of the relay protection device comprises a protection action tripping state and a reclosing action state. The control circuit can obtain the current state of the relay protection device through the control background.

The current state of the circuit breaker comprises a state that the circuit breaker is in a breaking state and a state that the circuit breaker is in a closing state. The control circuit can obtain the current state of the circuit breaker through controlling the background.

S504, determining whether the tripping circuit is normal according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the first optical coupler.

S506, determining whether the closing loop is normal or not according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the second optical coupler.

In the embodiment of the application, the control circuit determines whether the tripping circuit is normal or not according to the current state of the relay protection device, the current state of the circuit breaker, the level signal of the first optical coupler and the level signal of the second optical coupler, and determines whether the closing circuit is normal or not according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the second optical coupler, so that abnormal conditions of the closing circuit and the tripping circuit can be found in time, and the situation that the relay protection device fails to operate is avoided.

In one embodiment, determining whether the trip circuit is normal according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the first optocoupler includes determining that the trip circuit is normal when the relay protection device action outlet is in an open state and the circuit breaker is in a closed state and the first optocoupler outputs a high level signal, or when the relay protection device protection action trips to the circuit breaker is in a split state and the first optocoupler outputs a low level signal; and determining that the tripping circuit is abnormal under the condition that the action outlet of the relay protection device is in an open state and the circuit breaker is in a closed state and the first optical coupler outputs a low-level signal, or under the condition that the protection action of the relay protection device trips to the circuit breaker to be in a separated state and the first optical coupler outputs a high-level signal.

In one embodiment, determining whether the closing circuit is normal according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the second optocoupler includes determining that the closing circuit is normal when the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a closed state and the second optocoupler outputs a low level signal, or when the reclosing action of the relay protection device is to the circuit breaker is in a closed state and the second optocoupler outputs a low level signal; and determining that the closing loop is abnormal under the condition that the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the second optical coupler outputs a high-level signal, or under the condition that the reclosing action of the relay protection device is in the closing state and the second optical coupler outputs a high-level signal. The relevant steps are already specifically described in the foregoing embodiments, and are not repeated here.

In the description of the present specification, reference to the term "some embodiments," "other embodiments," etc., means 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 application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application, and are described in detail, but are not to be construed as limiting the scope of the application. It should be noted that it is possible for those skilled in the art to make several variations and modifications without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (10)

1. The utility model provides a relay protection device tripping and closing circuit monitoring system which characterized in that includes: the tripping circuit, the closing circuit, the first conversion circuit, the first optical coupler, the second conversion circuit, the second optical coupler and the control circuit, wherein,

The first conversion circuit is respectively connected with the protection action outlet of the tripping circuit and the first end of the first optical coupler and is used for performing voltage conversion of the protection action outlet of the tripping circuit;

The second conversion circuit is respectively connected with the reclosing action outlet of the switching-on loop and the first end of the second optical coupler and is used for performing voltage conversion of the reclosing action outlet of the switching-on loop;

The control circuit is respectively connected with the second end of the first optical coupler and the second end of the second optical coupler and is used for determining whether the tripping circuit is normal or not according to the level signal output by the first optical coupler and determining whether the closing circuit is normal or not according to the level signal output by the second optical coupler.

2. The relay protection device tripping and closing loop monitoring system of claim 1, wherein the control circuit is configured to:

When the protection action outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the first optical coupler outputs a high-level signal, or when the protection action of the relay protection device trips to the circuit breaker in a breaking state and the first optical coupler outputs a low-level signal, determining that the tripping circuit is normal;

and determining that the tripping circuit is abnormal when the protection action of the relay protection device is tripped to the state that the circuit breaker is in a breaking state and the first optocoupler outputs a high-level signal.

3. The relay protection device tripping and closing circuit monitoring system of claim 2, wherein the control circuit is further configured to:

When the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, or when the reclosing action of the relay protection device is to the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, determining that the closing loop is normal;

and determining that the closing loop is abnormal when the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the second optical coupler outputs a high-level signal, or when the reclosing action of the relay protection device is in a closing state and the circuit breaker outputs a high-level signal.

4. The relay protection device tripping and closing circuit monitoring system of claim 1, wherein the tripping circuit comprises a closing position relay, a DL normally open contact, a protection tripping exit pad and a tripping coil, wherein,

The first end of the switching-on position relay is respectively connected with the positive electrode of the control power supply, the first end of the protection tripping contact and the first input end of the first conversion circuit, the second end of the switching-on position relay is respectively connected with the first end of the DL normally open contact and the second end of the protection tripping outlet pressing plate, the second end of the first conversion circuit is respectively connected with the second end of the protection tripping contact and the first end of the protection tripping pressing plate, the first end of the tripping coil is connected with the second end of the DL normally open contact, and the second end of the tripping coil is connected with the negative electrode of the control power supply;

when the protective action outlet of the relay protection device is in an open state, the circuit breaker is in a close state and the tripping circuit is normal, the DL normally open contact is closed;

And under the condition that the protective action outlet of the relay protection device is in an open state, the circuit breaker is in a breaking state and the tripping circuit is normal, the DL normally open contact is opened.

5. The relay protection device tripping and closing circuit monitoring system of claim 1, wherein the closing circuit comprises a tripping position relay, a DL normally closed contact, a reclosing pressure plate and a closing coil, wherein,

The first end of the switching-off position relay is respectively connected with the positive electrode of the control power supply, the first end of the reclosing contact and the first input end of the second conversion circuit, the second end of the switching-off position relay is respectively connected with the first end of the DL normally closed contact and the second end of the reclosing pressing plate, the second end of the second conversion circuit is respectively connected with the second end of the reclosing contact and the first end of the reclosing pressing plate, the first end of the closing coil is connected with the second end of the DL normally closed contact, and the second end of the closing coil is connected with the negative electrode of the control power supply;

when the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a closed state, the DL normally-closed contact is disconnected;

and when the reclosing action outlet of the relay protection device is in an open state and the circuit breaker is in a breaking state, the DL normally-closed contact is closed.

6. The relay protection device tripping and closing circuit monitoring system of claim 1, wherein the first end of the first optical coupler comprises a positive input end and a negative input end;

The first conversion circuit includes:

One end of the first positive voltage conversion circuit is connected with the positive terminal of the protection action outlet of the tripping circuit, and the other end of the first positive voltage conversion circuit is connected with the positive input end of the first optical coupler and is used for completing the positive voltage conversion of the protection action outlet of the tripping circuit;

and one end of the first negative voltage conversion circuit is connected with the negative electrode terminal of the protection action outlet of the tripping circuit, and the other end of the first negative voltage conversion circuit is connected with the negative electrode input end of the first optical coupler and is used for completing the negative voltage conversion of the protection action outlet of the tripping circuit.

7. The relay protection device tripping and closing circuit monitoring system of claim 1, further comprising:

The dispatching master station is connected with the control circuit and used for outputting an alarm signal under the condition that any one of the tripping circuit and the closing circuit is abnormal.

8. A method for monitoring a tripping and closing loop of a relay protection device, which is applied to the tripping and closing loop monitoring system of the relay protection device as claimed in any one of claims 1 to 7, and comprises the following steps:

acquiring the current state of the relay protection device, the current state of the circuit breaker, a level signal of the first optical coupler and a level signal of the second optical coupler;

determining whether a tripping circuit is normal or not according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the first optical coupler;

And determining whether a closing loop is normal or not according to the current state of the relay protection device, the current state of the circuit breaker and the level signal of the second optical coupler.

9. The method of claim 8, wherein determining whether the trip circuit is normal based on the current state of the relay protection device, the current state of the circuit breaker, and the level signal of the first optocoupler comprises:

When the protection action outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the first optical coupler outputs a high-level signal, or when the protection action of the relay protection device trips to the circuit breaker in a breaking state and the first optical coupler outputs a low-level signal, determining that the tripping circuit is normal;

and determining that the tripping circuit is abnormal when the protection action of the relay protection device is tripped to the state that the circuit breaker is in a breaking state and the first optocoupler outputs a high-level signal.

10. The method for monitoring a tripping and closing loop of a relay protection device according to claim 8, wherein the determining whether the closing loop is normal according to the current state of the relay protection device, the current state of a circuit breaker and the level signal of the second optical coupler comprises:

When the reclosing outlet of the relay protection device is in an open state and the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, or when the reclosing action of the relay protection device is performed until the circuit breaker is in a closed state and the second optical coupler outputs a low-level signal, determining that the closing loop is normal;

And determining that the closing loop is abnormal when the reclosing outlet of the relay protection device is in an open state and the circuit breaker is in a closing state and the second optical coupler outputs a high-level signal, or when the reclosing action of the relay protection device is performed until the circuit breaker is in a closing state and the second optical coupler outputs a high-level signal.