Reclosing locking loop of relay protection device in 3 / 2 wiring mode

Abstract

The invention provides a reclosing locking loop of a relay protection device in a 3 / 2 wiring mode. The reclosing locking loop comprises a reclosing locking loop body, a first type of relay and a second type of relay, opening and closing position magnet exciting coils on the first kind of relays are connected between the positive electrode and the negative electrode of a first power source in series, an actuating coil is connected with a closing position contact in series and then connected with the closing position magnet exciting coil in parallel, and a reset coil is connected with a separating position contact in series and then connected with a separating position magnet exciting coil in parallel. The magnet exciting coil on the second type of relay is connected in parallel with the separating magnet exciting coil of the first type of relay, and the normally open contact is connected between the reclosing locking loop body and a second power supply, so that the magnet exciting coil is electrified and excited when the separating magnet exciting coil of the first type of relay is electrified and excited; and the normally open contact is controlled to be closed to enable the reclosing locking loop body to discharge so as to lock the reclosing function of the relay protection device. According to the invention, the risk that the relay protection device cannot lock the reclosing function due to the position uncertainty of the closed relay can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection, and in particular to a reclosing lockout circuit of a relay protection device in a two-thirds wiring mode. Background Art

[0002] In the two-thirds wiring method, the reclosing lockout circuit of the relay protection device and the circuit breaker together form an auxiliary protection function. At present, there are four types of reclosing lockout circuits for relay protection devices, namely single-phase reclosing mode, three-phase reclosing mode, comprehensive reclosing mode and disabled reclosing mode. However, according to the requirements of circuit breaker installation, the single-phase reclosing mode is particularly important. When the relay protection device receives an external manual trip and permanent trip command or the operation box loses power to lock the reclosing, the reclosing lockout circuit of the relay protection device is discharged, thereby locking the reclosing function of the relay protection device.

[0003] In the existing single-phase reclosing mode, the reclosing lock circuit is often equipped with a post-closing relay to control the on or off. Figure 1 As shown, the closed relay includes a closed position excitation coil SHJ, an open position excitation coil STJ, an action coil HHJ1, a reset coil HHJ2, a closed position contact SHJ-1, an open position contact STJ-1 and a normally closed contact HHJ-1; wherein, when the manual closing contact K1 is manually closed, the closed position excitation coil SHJ is energized and excited, so that the closed position contact SHJ-1 of the closed relay is closed in the "manual closed position" state, so that the action coil HHJ1 is energized and excited to control the normally closed contact HHJ-1 Open, so that the reclosing lock circuit of the relay protection device is not conductive, to ensure that the relay protection device is normally charged after the circuit breaker is closed; when the manual tap contact K2 is manually closed, the open excitation coil STJ is energized and energized, so that the open contact STJ-1 of the relay is closed in the "manual jump reset" state after closing, so that the reset coil HHJ2 is energized and energized to control the normally closed contact HHJ-1 from open to closed, so that the reclosing lock circuit is conductive and discharged, thereby locking the reclosing function of the protection device.

[0004] However, during the interval maintenance of the circuit breaker, if the circuit breaker is opened and closed in the "phase selection" or "non-phase selection" state, there will be a risk that the relay protection device cannot lock the reclosing function due to the uncertainty of the position of the relay after closing. For example, when the circuit breaker is remotely closed in the "phase selection" state, if the position of the relay after closing cannot be switched from the "manual trip reset" state to the "manual closing set" state, the normally closed contact HHJ-1 of the relay after closing will remain closed. Once the circuit breaker is closed, the reclosing lockout circuit will be turned on and discharged without being charged. At this time, if there is a single-phase instantaneous grounding fault in the line, the circuit breaker will directly trip three times and cannot meet the single trip and single reclosing requirements. For another example, when the circuit breaker is remotely opened in the "phase selection" state, if the position of the relay after closing cannot be switched from the "manual closing setting" state to the "manual trip reset" state, the normally closed contact HHJ-1 of the relay after closing will open, making it impossible for the reclosing lockout circuit of the relay protection device to conduct and discharge, and thus the reclosing function of the relay protection device cannot be locked, resulting in a problem that the operating mode is inconsistent with the actual requirements of the site.

[0005] Therefore, it is necessary to transform the reclosing lockout circuit in the existing single-phase reclosing mode to avoid the risk that the relay protection device cannot lock the reclosing function due to the uncertainty of the position of the relay after closing. Summary of the invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a reclosing lockout circuit for a relay protection device in a two-thirds wiring method, which can avoid the risk of the relay protection device being unable to lock the reclosing function due to the uncertainty of the position of the relay after closing.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a reclosing lockout circuit of a relay protection device in a two-thirds wiring mode, comprising a reclosing lockout circuit body, a first type of relay and a second type of relay; wherein,

[0008] The first type of relay is a post-closing relay, which is provided with a closed-position excitation coil, an open-position excitation coil, an action coil, a reset coil, a closed-position contact controlled by the closed-position excitation coil, an open-position contact controlled by the open-position excitation coil, and a normally closed contact controlled by the action coil and the reset coil; wherein the closed-position excitation coil and the open-position excitation coil of the first type of relay are respectively connected in series between the positive and negative poles of the first power supply, the action coil is connected in series with the set closed-position contact and then connected to the two ends of the set closed-position excitation coil, and the reset coil is connected in series with the set open-position contact and then connected to the two ends of the set open-position excitation coil;

[0009] The second type of relay is provided with an excitation coil and a normally open contact; wherein the excitation coil of the second type of relay is connected in parallel to the two ends of the split excitation coil provided on the first type of relay, and its normally open contact is connected between the reclosing lockout circuit body and the second power supply;

[0010] Among them, the excitation coil of the second type of relay is energized and excited when the open-position excitation coil of the first type of relay is energized and excited, controlling the normally open contact to close, ensuring that the reclosing lockout circuit body is connected to the second power supply for discharge, so as to lock the reclosing function of the relay protection device; and, when the closed-position excitation coil of the first type of relay is energized and excited, the excitation coil of the second type of relay keeps the normally open contact open, so as to ensure that the relay protection device is charged normally.

[0011] Wherein, the first power supply and the second power supply are both direct current power supplies.

[0012] Wherein, the second type of relay is a DC electromagnetic relay.

[0013] Wherein, the post-closing relay is a double-turn magnetically latched double-position relay.

[0014] Implementing the embodiments of the present invention has the following beneficial effects:

[0015] The present invention is based on the fact that even if the first type of relay (such as a post-closing relay) fails and causes a position loss, because the excitation coil of the second type of relay is connected in parallel to the two ends of the split excitation coil provided for the first type of relay, and its normally open contact replaces the normally closed contact of the first type of relay and is connected between the reclosing lockout circuit body and the second power supply, it is ensured that the circuit breaker and the reclosing lockout circuit body can complement each other in protection (that is, the reclosing lockout circuit body is disconnected when the circuit breaker is closed, and the reclosing lockout circuit body is opened when the circuit breaker is opened), which can avoid the risk of the relay protection device being unable to lock the reclosing function due to the uncertainty of the position of the post-closing relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0017] Figure 1 It is a circuit connection diagram of a reclosing lockout circuit of a relay protection device in the prior art;

[0018] Figure 2The present invention provides a schematic diagram of the connection of a reclosing lockout circuit of a three-half wiring relay protection device. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 2 As shown in the figure, a reclosing lockout circuit of a relay protection device in a two-thirds wiring mode is proposed in an embodiment of the present invention, comprising a reclosing lockout circuit body, a first type of relay and a second type of relay; wherein,

[0021] The first type of relay is a post-closing relay, which is provided with an excitation coil SHJ, an open-position excitation coil STJ, an action coil HHJ1, a reset coil HHJ2, a closed-position contact SHJ-1 controlled by the closed-position excitation coil SHJ, an open-position contact STJ-1 controlled by the open-position excitation coil STJ, and a normally closed contact HHJ-1 controlled by the action coil HHJ1 and the reset coil HHJ2; wherein the closed-position excitation coil SHJ and the open-position excitation coil STJ of the first type of relay are respectively connected in series between the positive and negative poles of the first power supply (such as the DC power supply K1+, K1-), its action coil HHJ1 is connected in series with the set closed-position contact SHJ-1 and then connected to the two ends of the set closed-position excitation coil SHJ, and its reset coil HHJ2 is connected in series with the set open-position contact STJ-1 and then connected to the two ends of the set open-position excitation coil STJ;

[0022] The second type of relay is a DC electromagnetic relay, which is provided with an excitation coil ZJ and a normally open contact ZJ-1; wherein, the excitation coil ZJ of the second type of relay is connected in parallel to the two ends of the split excitation coil STJ provided on the first type of relay, and its normally open contact ZJ-1 replaces the normally closed contact HHJ-1 on the first type of relay to be connected between the reclosing lockout circuit body and the second power supply (such as DC power supply K2+, K2-);

[0023] Among them, the excitation coil ZJ of the second type relay is energized and excited when the open-position excitation coil STJ of the first type relay is energized and excited, controlling the normally open contact ZJ-1 to close, ensuring that the reclosing lockout circuit body and the second power supply are connected to discharge, so as to lock the reclosing function of the relay protection device; and, when the closed-position excitation coil SHJ of the first type relay is energized and excited, the excitation coil ZJ of the second type relay keeps the normally open contact ZJ-1 open, so as to ensure that the relay protection device is charged normally.

[0024] In an embodiment of the present invention, the working principle of the reclosing lockout circuit of a relay protection device in a two-thirds wiring mode is that when the circuit breaker is closed for protection, the normally open contact ZJ-1 of the second type relay remains open, so that the main body of the reclosing lockout circuit is not conductive, ensuring that the protection device can be charged normally. When the circuit breaker is opened, the normally open contact ZJ-1 of the second type relay is closed, so that the main body of the reclosing lockout circuit is conductive and discharged, so as to lock the reclosing function of the relay protection device.

[0025] Implementing the embodiments of the present invention has the following beneficial effects:

[0026] The present invention is based on the fact that even if the first type of relay (such as a post-closing relay) fails and causes a position loss, because the excitation coil of the second type of relay is connected in parallel to the two ends of the split excitation coil provided for the first type of relay, and its normally open contact replaces the normally closed contact of the first type of relay and is connected between the reclosing lockout circuit body and the second power supply, it is ensured that the circuit breaker and the reclosing lockout circuit body can complement each other in protection (that is, the reclosing lockout circuit body is disconnected when the circuit breaker is closed, and the reclosing lockout circuit body is opened when the circuit breaker is opened), which can avoid the risk of the relay protection device being unable to lock the reclosing function due to the uncertainty of the position of the post-closing relay.

[0027] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A reclosing lockout circuit for a relay protection device in a two-thirds wiring mode, characterized in that: It includes a reclosing lockout circuit body, a first-class relay and a second-class relay; wherein, The first type of relay is a post-closing relay, which is provided with a closed-position excitation coil, an open-position excitation coil, an action coil, a reset coil, a closed-position contact controlled by the closed-position excitation coil, an open-position contact controlled by the open-position excitation coil, and a normally closed contact controlled by the action coil and the reset coil; wherein the closed-position excitation coil and the open-position excitation coil of the first type of relay are respectively connected in series between the positive and negative poles of the first power supply, the action coil is connected in series with the set closed-position contact and then connected to the two ends of the set closed-position excitation coil, and the reset coil is connected in series with the set open-position contact and then connected to the two ends of the set open-position excitation coil; The second type of relay is provided with an excitation coil and a normally open contact; wherein the excitation coil of the second type of relay is connected in parallel to the two ends of the split excitation coil provided on the first type of relay, and its normally open contact is connected between the reclosing lockout circuit body and the second power supply; Among them, the excitation coil of the second type of relay is energized and excited when the open-position excitation coil of the first type of relay is energized and excited, controlling the normally open contact to close, ensuring that the reclosing lockout circuit body is connected to the second power supply for discharge, so as to lock the reclosing function of the relay protection device; and, when the closed-position excitation coil of the first type of relay is energized and excited, the excitation coil of the second type of relay keeps the normally open contact open, so as to ensure that the relay protection device is charged normally.

2. The reclosing lockout circuit of the three-half wiring relay protection device according to claim 1, characterized in that: The first power source and the second power source are both direct current power sources.

3. The reclosing lockout circuit of the three-half wiring relay protection device according to claim 2, characterized in that: The second type of relay is a DC electromagnetic relay.

4. The reclosing lockout circuit of the three-half wiring relay protection device according to claim 3, characterized in that: The post-closing relay is a double-turn magnetically latched double-position relay.

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