Blocking loop of field suppression switch
By introducing a dual-coil jump locking relay and an anti-hop locking circuit, the repeated opening and closing problem of the generator demagnetization switch caused by the adhesion of the closing node is solved, and the reliability of the demagnetization switch is improved.
Patent Information
- Application Number
- CN202422289436.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-19
AI Technical Summary
When the existing generator demagnetization switch is stuck at the closing node, it will cause repeated disconnection and closing, resulting in damage to the demagnetization switch or failure to demagnetization, affecting the demagnetization function of the accident.
A dual-coil jump locking relay and an anti-hop locking circuit are introduced to maintain the coordination of the coil and the voltage by the current start-up coil to prevent repeated opening and closing caused by adhesion of the closing node, and increase the anti-hop locking function.
The improved demagnetization control circuit prevents the demagnetization switch from being repeatedly opened and closed due to adhesion of the closing node, improving the reliability of the demagnetization accident.
Smart Images
Figure CN223092768U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a locking circuit for a field discharge switch. Background Art
[0002] In the current control circuit of the generator field discharge switch, when the closing node of the field discharge switch is stuck, after the field discharge switch trips due to an accident, it will close again, and then repeatedly trip and close, resulting in damage to the field discharge switch or failure of field discharge. In the prior art, there is no anti-jump locking function for the field discharge switch. When the closing node is stuck, it will cause the field discharge switch to fail to trip normally during an accident, and even burn out the equipment. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a locking circuit for a field discharge switch, which is used to solve the problem that during accident field discharge, the field discharge switch will repeatedly trip and close, resulting in burning out of the field discharge switch or failure of field discharge, and affecting the accident field discharge function of the generator.
[0004] In order to solve the above problems, the technical solution of the utility model is as follows:
[0005] A locking circuit for a field discharge switch includes a field discharge switch FMK, a closing bus, a closing coil, a control power supply, a closing circuit and a tripping circuit, and further includes a double-coil anti-jump locking relay TBJ. The double-coil anti-jump locking relay TBJ includes a current starting coil TBJ / I and a voltage holding coil TBJ / U. The current starting coil TBJ / I is connected to the tripping coil circuit of the field discharge switch, and the voltage holding coil TBJ / U is connected to the closing circuit of the field discharge switch.
[0006] The closing coil includes normally open nodes Ca1, Ca2, Ca3 and a relay C:4-11 connected in series in sequence, and a warning lamp H1 is connected in parallel on one side of the closing coil.
[0007] It further includes an anti-jump locking circuit, and the anti-jump locking circuit includes a relay TWJ:6-18 and a normally open auxiliary node TBJ:8 of the anti-jump relay TBJ connected in series with the voltage coil TBJ\U of the anti-jump relay.
[0008] The field discharge switch FMK includes a normally closed node C3:3.1-3.2 and a relay RA connected in series with a normally closed node TBJ:3-5 in the double-coil anti-jump locking relay TBJ, a normally open node C3:2.1-2.2 and a resistor D1 connected in series with the current starting coil TBJ / I, and a normally open node C3:2.3-2.4 and a resistor D2 connected in series with the current starting coil TBJ / I.
[0009] The beneficial effect of the utility model is that the improved field discharge control circuit will no longer cause the field discharge switch to repeatedly trip and close during accident field discharge due to the stuck closing node, and improves the reliability of accident field discharge. Brief Description of the Drawings
[0010] The following further describes the present utility model in conjunction with the accompanying drawings:
[0011] Figure 1 It is a structural schematic diagram of the present utility model. Detailed Embodiment
[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0013] As Figure 1 shown, a de-energizing switch locking circuit includes a de-energizing switch FMK, a closing bus, a closing coil, a control power supply, a closing circuit, and a tripping circuit, and further includes a double-coil bounce locking relay TBJ. The double-coil bounce locking relay TBJ includes a current starting coil TBJ / I and a voltage holding coil TBJ / U. The current starting coil TBJ / I is connected to the tripping coil circuit of the de-energizing switch, and the voltage holding coil TBJ / U is connected to the closing circuit of the de-energizing switch.
[0014] The closing coil includes normally open nodes Ca1, Ca2, Ca3, and relay C:4-11 connected in series in sequence, and a pilot lamp H1 is connected in parallel on one side of the closing coil.
[0015] It further includes an anti-bounce locking circuit, and the anti-bounce locking circuit includes a relay TWJ:6-18 and a normally open auxiliary node TBJ:8 of the anti-bounce relay TBJ connected in series with the voltage coil TBJ\U of the anti-bounce relay.
[0016] The de-energizing switch FMK includes a normally closed node C3:3.1-3.2 and a relay RA connected in series with a normally closed node TBJ:3-5 in the double-coil bounce locking relay TBJ, a normally open node C3:2.1-2.2 and a resistor D1 connected in series with the current starting coil TBJ / I, and a normally open node C3:2.3-2.4 and a resistor D2 connected in series with the current starting coil TBJ / I.
[0017] The working principle of the present utility model is as follows:
[0018] When the field discharge switch FMK is in the closed state, if the trip control circuit operates at this time, the current coil of TBJ is energized, the normally open node 7-9 of TBJ closes, and the normally closed node 3-5 of TBJ opens. If there is still a closing command while tripping, the voltage holding coil TBJ / U is self-held by energization, the normally open node 7-9 of TBJ closes, and the normally closed node 3-5 opens, making the TBJ node 3-5 in the closing circuit in the open position, the closing indicator light H1 goes out, and closing is not possible. Only when the closing signal disappears, the voltage holding coil TBJ / U loses power, and the TBJ node returns can closing be performed again; making the TBJ node 7-9 in the tripping circuit in the closed position, maintaining the tripping circuit to prevent multiple closings and inability to close again after tripping due to a fault.
[0019] It can be seen that by introducing the anti-pumping locking function, it can effectively prevent the field discharge switch from repeatedly tripping and closing during accident field discharge when the closing node of the field discharge switch adheres or the closing command is abnormal, resulting in damage to the field discharge switch or failure of field discharge and further expansion of the accident.
[0020] The working process of the present utility model is as follows:
[0021] 1) The tripping circuit of the series-parallel group of the remote local handle 61KK, the normally closed auxiliary node TBJ:3-5 of the anti-pumping relay TBJ, the relay RA, the normally open nodes Ca1, Ca2, Ca3 of RA, the resistors (D1 / D2), the diodes, the fuses, and the closing indicator light H1.
[0022] 2) The tripping circuit of the series-parallel group of the remote local handle 61KK, the normally closed auxiliary node 63CZJ:51-52, the normally open auxiliary node 68CJ:116-114 of the relay 68CJ, the normally open auxiliary node TBJ:7-9 of the anti-pumping relay TBJ, the current starting coil TBJ / I, the normally open auxiliary nodes C3:2.1-2.2, C3:2.3-2.4 of the F102-Y M3 type, the resistors, and the diodes.
[0023] 3) The normally open auxiliary node TBJ:8, the voltage holding coil TBJ / U, and the relay TWJ form an anti-pumping locking circuit.
[0024] After adding the anti-pumping locking circuit, the working process and the action logic of each component are as follows:
[0025] A remote closing command or manual closing is issued and maintained all the time to simulate the fault that the closing command always exists; TBJ:3-5→TBJ:8→TBJ:7-9→C3:3.1-3.2→RA→RA:Ca1, Ca2, Ca3 circuit is conducting→the closing indicator light H1 is on, the closing coil is energized, and the field discharge switch closes; the voltage holding coil TBJ / U is energized, TBJ:3-5 opens, the closing circuit is disconnected, and closing cannot continue; TBJ:7-9 closes, maintaining the tripping state.
[0026] The content described in the embodiments of this specification is only an enumeration of the implementation forms of the utility model concept. The protection scope of the present utility model should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present utility model also extends to equivalent technical means that those skilled in the art can think of based on the utility model concept.
Claims
1. A field discharge switch locking circuit, comprising a field discharge switch FMK, a closing bus, a closing coil, a control power supply, a closing circuit and a tripping circuit, characterized in that: It also includes a double-coil jump locking relay TBJ. The double-coil jump locking relay TBJ includes a current starting coil TBJ / I and a voltage holding coil TBJ / U. The current starting coil TBJ / I is connected to the tripping coil circuit of the field discharge switch FMK, and the voltage holding coil TBJ / U is connected to the closing circuit of the field discharge switch FMK.
2. The de-energizing switch locking circuit according to claim 1, characterized in that: The closing coil includes normally open nodes Ca1, Ca2, Ca3 and a relay C: 4-11 connected in series in sequence. A warning lamp H1 is connected in parallel on one side of the closing coil.
3. A field discharge switch locking circuit according to claim 1, characterized in that: It also includes an anti-jump locking circuit. The anti-jump locking circuit includes a relay TWJ: 6-18 and a normally open auxiliary node TBJ: 8 of the anti-jump relay TBJ connected in series with the voltage coil TBJ\U of the anti-jump relay.
4. A field discharge switch locking circuit according to claim 1, characterized in that: The field discharge switch FMK includes a normally closed node C3: 3.1-3.2 and a relay RA connected in series with the normally closed node TBJ: 3-5 in the double-coil jump locking relay TBJ, a normally open node C3: 2.1-2.2 and a resistor D1 connected in series with the current starting coil TBJ / I, and a normally open node C3: 2.3-2.4 and a resistor D2 connected in series with the current starting coil TBJ / I.