Subway 35kV high-voltage system fault positioning device

Abstract

The utility model discloses a fault positioning device for a metro 35kV high-voltage system, which judges the position of a fault point by connecting each open point of a closing control loop of a 35kV high-voltage circuit breaker, and comprises a PLC (Programmable Logic Controller), a control button, a plurality of indicating lamps and four detection relays, the signal input end of the PLC controller is connected with the normally open contacts of the four detection relays, and the four detection relays are connected with the normally open contacts of the PLC controller. The coil of each detection relay is connected in series between the second port and the twelfth port of the 35kV switch cabinet, between the twelfth port and the twenty-sixth port, between the twelfth port and the twenty-third port, and between the twelfth port and the twenty-eighth port. The signal output end of the PLC is connected with a plurality of indicating lamps. The general fault point location of the closing loop of the circuit breaker is displayed through the indicating lamp, so that whether the fault point is on the side of the protection device or the side of the circuit breaker can be easily judged, 50% of workload is saved, and the fault processing efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of subway fault detection, in particular to a subway 35kV high-voltage system fault locating device. Background Art

[0002] The traction substation is the "kinetic energy station" for electric train traction power supply. It converts 35kV AC high-voltage power from the external grid into 750V DC, transmits it to the subway line contact rail, and supplies power to the electric train through the receiving shoe. The traction step-down hybrid substation not only provides DC traction power for the subway, but also provides AC low-voltage power to power subway platforms, stations, signaling systems, and other systems.

[0003] If a single station's 35kV power supply system fails, dual power supply at one or more stations will be degraded to a single power supply. Furthermore, if a combined fault occurs and the busbar fails to automatically reconnect, the station's tertiary loads will be deactivated, and the 400V power supply will be deactivated to a single power supply. The DC feeder supplied by the lost 35kV busbar will also be deactivated, and the catenary section it supplies will be degraded to a single-side or inter-zone, double-side power supply. This will also affect the passenger experience and reduce power supply reliability.

[0004] Therefore, the quality of the 35kV high-voltage system directly impacts the smooth operation of the subway. When a 35kV high-voltage system failure occurs, power supply professionals must be able to quickly and accurately resolve the problem, placing higher demands on timeliness. Furthermore, locating the fault point in the 35kV high-voltage system is essential.

[0005] However, the fault location of 35kV high-voltage system in various cities is still a "blind spot" at present. There is no auxiliary positioning device for 35kV high-voltage system fault handling.

[0006] Mainly reflected in:

[0007] The 1.35kV high-voltage switchgear is a non-dynamic device. During switching operations, circuit breaker closing failure often occurs. Without troubleshooting, it is impossible to determine whether the closing failure is caused by the protection device or the circuit breaker.

[0008] The 2.35kV protection device and integrated automation monitoring system only display the closing failure message and cannot show the fault point.

[0009] In view of the above shortcomings, the present application proposes a subway 35kV high voltage system fault location device. Utility Model Content

[0010] Therefore, the purpose of the present invention is to provide a subway 35kV high-voltage system fault locating device that can directly display the approximate fault point of the circuit breaker closing circuit, so that it can easily determine whether the fault point is on the protection device side or the circuit breaker side, saving 50% of the workload and greatly improving the efficiency of fault handling.

[0011] To achieve the above objectives, the utility model provides a subway 35kV high-voltage system fault locating device, which determines the location of the fault point by connecting to the various output points of the 35kV high-voltage circuit breaker closing control circuit, and includes: a PLC controller, a control button, multiple indicator lights and four detection relays;

[0012] The signal input end of the PLC controller is respectively connected to the normally open contacts of four detection relays, among which the coil of the first detection relay is connected in series between the second port and the twelfth port of the 35kV switch cabinet; the coil of the second detection relay is connected in series between the twelfth port and the twenty-sixth port of the 35kV switch cabinet; the coil of the third detection relay is connected in series between the twelfth port and the twenty-third port of the 35kV switch cabinet; the coil of the fourth detection relay is connected in series between the twelfth port and the twenty-eighth port of the 35kV switch cabinet; the signal output end of the PLC controller is respectively connected to a plurality of indicator lights;

[0013] Further preferably, the control button includes a start button and a stop button, the start button is connected in series with the coil of the first detection relay, and the stop button is connected to the power interface of the PLC controller.

[0014] Further preferably, it also includes a power conversion module, which converts 220V direct current into 24V voltage, and the power conversion module is connected to the power interface of the PLC controller.

[0015] Further preferably, the indicator lights include a readiness detection indicator light, a closing permission indicator light, a closing prohibition indicator light, a control power supply to the circuit breaker indicator light, and a control power supply not supplied to the circuit breaker indicator light, and the indicator lights are respectively linked to the signal output terminals corresponding to the PLC controller.

[0016] Further preferably, it further comprises a plurality of wiring terminals, wherein the wiring terminals include: a +110V wiring terminal, a -110V wiring terminal, a closing button input terminal, a closing permission input terminal and a closing output input terminal;

[0017] Further preferably, the +110V terminal is connected to the second port in the 35kV switch cabinet; the -110V terminal is connected to the first port; the closing button input terminal is connected to the thirteenth port; the closing permission input terminal is connected to the twenty-sixth port; and the closing output input terminal is connected to the twenty-eighth port.

[0018] The present application discloses a subway 35kV high-voltage system fault locating device, which can directly display the approximate fault point of the circuit breaker closing circuit by connecting the various output points of the 35kV high-voltage circuit breaker closing control circuit, thereby easily determining whether the fault point is on the protection device side or the circuit breaker side, saving 50% of the workload and greatly improving the efficiency of fault handling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the existing subway 35kV high-voltage circuit in this utility model.

[0020] Figure 2 This is the circuit principle diagram of the subway 35kV high-voltage system fault locating device in the utility model.

[0021] Figure 3 This is a schematic diagram of the internal circuit of the utility model's 35kV high-voltage system fault locating device for subways.

[0022] FIG4( a ) is a logic judgment diagram of Example 1 of the present utility model.

[0023] FIG4( b ) is a logic judgment diagram of Example 2 of the present utility model.

[0024] FIG4( c ) is a logic judgment diagram of Example 3 of the present utility model.

[0025] Figure 4(d) is a logic judgment diagram of Example 4 of the present utility model DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below through the accompanying drawings and specific implementation methods.

[0027] like Figure 1 As shown, a subway 35kV high-voltage system fault locating device provided by an embodiment of the present invention is connected to each output point of the 35kV high-voltage circuit breaker closing control circuit to determine the location of the fault point; the circled positions are the positions of the various output points used for detection.

[0028] like Figure 2 As shown, the subway 35kV high-voltage system fault locating device is externally provided with five indicator lights, two buttons and four connection ports; wherein the four connection ports include a +110V connection terminal, a -110V connection terminal, a closing button input terminal, a closing permission input terminal and a closing output input terminal;

[0029] The +110V terminal is connected to the second port X2:2 behind the 35kV switch cabinet; the -110V terminal is connected to the first port X2:1;

[0030] The closing button input terminal is connected to the thirteenth port X2:13; the closing permission input terminal is connected to the twenty-sixth port X2:26; the closing output input terminal is connected to the twenty-eighth port X2:28;

[0031] The two buttons include a start button and a stop button; the five indicator lights include a ready detection indicator light, a closing permission indicator light, a closing prohibition indicator light, an indicator light indicating that the control power is sent to the circuit breaker, and an indicator light indicating that the control power is not sent to the circuit breaker.

[0032] like Figure 3 As shown, when the subway 35kV high-voltage system fault locating device is connected to the 35kV switch cabinet, it also includes a "start button" S0.0 (normally open contact) and a coil of a "first detection relay-start detection relay" K01 connected in series between the second port X2:2 and the twelfth port X2:12 of the switch cabinet; a second detection relay, namely a "closing permission output relay" K02 coil, is connected in series between the twenty-sixth port X2:26 and the twelfth port X2:12; a third detection relay, namely a "closing button input relay" K03 coil, is connected in series between the thirteenth port X2:13 and the twelfth port X2:12; and a fourth detection relay, namely a "closing output input relay" K04 coil, is connected in series between the twenty-eighth port X2:28 and the twelfth port X2:12.

[0033] The subway 35kV high voltage system fault locating device further includes:

[0034] A voltage conversion module is used to provide 220V voltage and convert 220V DC power into 24V voltage;

[0035] Connect the 24V voltage output end of the voltage conversion module to the PLC controller, and connect the positive and negative poles of the 24VDC voltage to the L+ (1L+) and M (1M) points of the PLC respectively; connect the normally open contacts of K01, K02, K03, and K04 to the input terminals I0.0, I0.1, I0.2, and I0.3 of the PLC respectively, and connect the I0.4 terminal of the PLC to the "stop detection button" S0.4; connect the indicator lights H01, H02, H03, H04, and H05 to the output terminals Q0.0, Q0.1, Q0.2, Q0.3, and Q0.4 of the PLC respectively.

[0036] Connect the +110V terminal to the X2:2 terminal on the rear door of the 35kV switchgear; connect the -110V terminal to the X2:12 terminal; connect the closing button input terminal to the X2:13 terminal; connect the closing permission output terminal to the X2:26 terminal; and connect the closing output input terminal to the X2:28 terminal.

[0037] Press the "start button" on the surface of the device to start the test; the operator performs the closing operation of the 35kV circuit breaker (local or remote closing is possible) and conducts an electric closing test. The potential of each output point of the closing circuit changes and is transmitted to the inside of the device. After passing through the PLC, the corresponding fault point location signal is finally output and displayed. Thus, it helps the on-site personnel to locate the fault point. The test process adopted in this application is formed by using the on-off of the internal relay of the PLC to form the "AND OR NOT" basic logic judgment. It does not involve innovation in the control program. The innovation of this application is to use a simple circuit structure to realize the fault point location.

[0038] The specific testing process includes:

[0039] As shown in Figure 4(a), Example 1 performs a closing logic check. After the start button is pressed, the coil of the first detection relay K01 is energized. According to the delay time set by the PLC internal timer, after the timer delays for 10 seconds, the closing logic check begins. When the 35kV circuit breaker meets the closing logic, the normally closed contact Q0.2 prohibits closing and outputs a high level. The normally closed contact of the closing output input Q0.3 outputs a high level. X2:26 outputs a high level of 220VDC. The coil of the K02 relay is energized, the normally open contact closes, and the output is high. At this time, the normally open contact I0.1 closes and outputs a high level. The coil of Q0.1, which allows closing, is energized and outputs a high level. The normally open contact of Q0.1 outputs a high level, and the coil of Q0.1 is self-locked. At this time, the closing permission indicator H02 lights up.

[0040] As shown in Example 2 of Figure 4(b), after the closing logic check is complete, the closing inhibit logic check begins after a 2.5-second delay by timer T33. When the 35kV circuit breaker does not meet the closing logic, coil Q0.1 is not energized, and its normally closed contact outputs a high level. The closing inhibit coil Q0.2 is energized, and its normally open contact outputs a high level, causing the coil to self-lock. The closing inhibit indicator H03 illuminates.

[0041] As shown in Example 3 in Figure 4(c), when external conditions satisfy the closing logic (Q0.1 coil is energized, the normally open contact closes, and the output is high; Q0.2 coil is not energized, and the normally closed contact outputs a high level), if the control circuit secondary power can be supplied to the circuit breaker, X2:28 outputs a high 220VDC voltage, the K04 coil is energized, the normally open contact outputs a high level, and the normally open contact of I0.3 closes and outputs a high level. However, the circuit breaker does not close successfully, and the fault is considered to be internal to the circuit breaker. When a closing command is issued to the circuit breaker, X2:13 outputs a high 220VDC voltage, the K03 coil is energized, the normally open contact outputs a high level, and the normally open contact of the PLC internal relay I0.2 closes and outputs a high level. Control power is supplied to the circuit breaker's Q0.3 coil, which energizes its normally open contact and outputs a high level, causing the Q0.3 coil to self-lock. Control power is supplied to the circuit breaker, and indicator light H04 illuminates.

[0042] As shown in Example 4 of Figure 4 (d), if the control power is not sent to the circuit breaker, the Q0.3 coil will not be energized, its normally closed contact will be in the closed position, and the output will be high. The control power is not sent to the circuit breaker Q0.4 coil will be energized, and the control power is not sent to the circuit breaker indicator H05 will light up.

[0043] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A subway 35kV high-voltage system fault location device, which determines the location of the fault point by connecting the various output points of the 35kV high-voltage circuit breaker closing control loop, characterized in that: include: PLC controller, control buttons, multiple indicator lights and four detection relays; The signal input end of the PLC controller is respectively connected to the normally open contacts of four detection relays. Among the four detection relays, the coil of the first detection relay is connected in series between the second port and the twelfth port of the 35kV switch cabinet; the coil of the second detection relay is connected in series between the twelfth port and the twenty-sixth port of the 35kV switch cabinet; the coil of the third detection relay is connected in series between the twelfth port and the twenty-third port of the 35kV switch cabinet; the coil of the fourth detection relay is connected in series between the twelfth port and the twenty-eighth port of the 35kV switch cabinet; the signal output end of the PLC controller is respectively connected to multiple indicator lights.

2. The subway 35kV high voltage system fault location device according to claim 1, characterized in that: The control button includes a start button and a stop button. The start button is connected in series with the coil of the first detection relay, and the stop button is connected to the power interface of the PLC controller.

3. The subway 35kV high voltage system fault location device according to claim 1, characterized in that: It also includes a power conversion module, which converts 220V direct current into 24V voltage. The power conversion module is connected to the power interface of the PLC controller.

4. The subway 35kV high voltage system fault location device according to claim 1, characterized in that: The indicator lights include a readiness detection indicator light, a closing permission indicator light, a closing prohibition indicator light, a control power supply to the circuit breaker indicator light, and a control power supply not supplied to the circuit breaker indicator light. The indicator lights are respectively linked to the signal output terminals corresponding to the PLC controller.

5. The subway 35kV high voltage system fault location device according to claim 1, characterized in that: It also includes multiple wiring terminals, which include: a +110V wiring terminal, a -110V wiring terminal, a closing button input terminal, a closing permission input terminal and a closing output input terminal.

6. The subway 35kV high voltage system fault location device according to claim 5, characterized in that: The +110V terminal is connected to the second port in the 35kV switch cabinet; the -110V terminal is connected to the first port; the closing button input terminal is connected to the thirteenth port; the closing permission input terminal is connected to the twenty-sixth port; and the closing output input terminal is connected to the twenty-eighth port.

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