Transformer core unstable grounding fault detector

Abstract

The transformer core unstable grounding fault instrument of the present invention belongs to the technical field of detection instruments, and particularly relates to a transformer core unstable grounding fault instrument, which includes a protective shell, a circuit, a jumper wire, a switch circuit, a rectifier circuit, and a discharge circuit. Through the above design, a transformer core unstable grounding fault instrument is provided, which has a simple structure and wide applicability. The transformer core unstable grounding fault is actually debugged by the fault instrument, and can be continuously charged and discharged multiple times during the test process, which can effectively eliminate the transformer core virtual grounding fault, thereby reducing the transformer power outage time, reducing a hidden danger for safety management, and also solving the practical difficulties in test and maintenance work.

Description

Technical Field

[0001] The invention belongs to the technical field of detection instruments, and in particular relates to a transformer core unstable grounding fault instrument. Background Art

[0002] During normal transformer operation, the core can only be grounded at one point. Operating experience shows that multi-point core grounding faults have become a frequent transformer failure, ranking third among all transformer accidents and warranting significant attention. Transformer multi-point grounding faults are often caused by suspended matter forming conductive bridges under the influence of electromagnetic fields. Traditionally, there are two main methods for troubleshooting unstable core grounding faults in transformers. First, capacitor discharge shock can be used. Second, a megohmmeter can be used to charge and discharge the capacitor.

[0003] When implementing the above two methods, handling unstable transformer core grounding faults is relatively complicated, and there is no test equipment on site. If the above methods are used, it is difficult to eliminate the unstable transformer core grounding fault when the transformer power outage time is limited. Therefore, we need to find a flexible, simple, fast, convenient and applicable method to handle unstable transformer core grounding faults.

[0004] In view of the above situation, a technology is needed to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a transformer core unstable grounding fault instrument to solve the problem that the unstable grounding of the transformer core is difficult to handle in the prior art.

[0006] A transformer core unstable grounding fault instrument, characterized by comprising a protective housing, a circuit and a bonding wire;

[0007] The protective shell is provided with a circuit, buttons and indicator lights;

[0008] The circuit includes a switch circuit, a rectifier circuit, and a discharge circuit, wherein the switch circuit, the rectifier circuit, and the discharge circuit are connected in series; a capacitor is connected in series between the diodes of the rectifier circuit, and the rectifier circuit is a rectifier circuit that inputs 220V AC and outputs 600V DC after rectification; an AC contactor is provided in parallel in the discharge circuit;

[0009] The output end of the circuit is provided with a jumper wire, and the end of the jumper wire is provided with an annular jumper ring, the size of the annular jumper ring matches the size of the transformer core lead wire;

[0010] The input end of the circuit is provided with an input port matching 220V AC;

[0011] The indicator lights include a discharge indicator light and a power indicator light, wherein the power indicator light is connected in parallel with the AC contactor in the discharge circuit, and the discharge indicator light is connected in parallel with the rectifier circuit;

[0012] The button is connected to the switch on the switch circuit.

[0013] The annular overlapping ring is a circular conductive metal ring.

[0014] The protective shell is provided with a grounding interface, which is electrically connected to the ground of the circuit.

[0015] Through the above design scheme, the present invention can bring the following beneficial effects: through the above design, a transformer core unstable grounding fault instrument is provided, which has a simple structure and wide applicability; the transformer core unstable grounding fault is actually debugged through the fault instrument, and it can be continuously charged and discharged multiple times during the test process, which can effectively eliminate the transformer core false grounding fault, thereby reducing the transformer power outage time, reducing a hidden danger for safety management, and also solving the practical difficulties in test and maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 A circuit diagram of the present invention;

[0019] Among them: 1-protective shell, 2-circuit, 3-bridging wire, 21-switch circuit, 22-rectifier circuit, 23-discharge circuit. DETAILED DESCRIPTION

[0020] As shown in the figure, a transformer core unstable grounding fault detector is characterized by comprising a protective housing 1, a circuit 2 and a bonding wire 3;

[0021] The protective housing 1 is provided with a circuit 2, buttons and indicator lights;

[0022] The circuit 2 includes a switch circuit 21, a rectifier circuit 22, and a discharge circuit 23, wherein the switch circuit 21, the rectifier circuit 22, and the discharge circuit 23 are connected in series; a capacitor is connected in series between the diodes of the rectifier circuit 22, and the rectifier circuit 22 is a rectifier circuit 22 that inputs 220V AC and outputs 600V DC after rectification; an AC contactor is connected in parallel in the discharge circuit 23;

[0023] The output end of the circuit 2 is provided with a jumper wire 3, and the end of the jumper wire 3 is provided with an annular jumper ring, the size of the annular jumper ring matches the size of the transformer core lead wire;

[0024] The input end of the circuit 2 is provided with an input port matching 220V AC;

[0025] The indicator lights include a discharge indicator light and a power indicator light, wherein the power indicator light is connected in parallel with the AC contactor in the discharge circuit 23, and the discharge indicator light is connected in parallel with the rectifier circuit 22;

[0026] The button is connected to the switch on the switch circuit 21 .

[0027] The protective shell 1 is provided with a grounding interface, which is electrically connected to the ground of the circuit 2.

[0028] The annular overlapping ring is a circular conductive metal ring.

[0029] The key comprises a start button;

[0030] During operation, circuit 2 is energized to charge the capacitor in the rectifier circuit 22. When the DC voltage (about 600V) is reached, the start button is pressed to operate the switch circuit 21, the discharge indicator light is on, and the rectifier circuit 22 discharges the transformer core through the discharge circuit 23 to eliminate the core instability fault. When the discharge is completed, the power indicator light is on and the discharge indicator light is off.

Claims

1. A transformer core unstable ground fault detector, characterized by: It comprises a protective shell (1), a circuit (2) and a bonding wire (3); The protective housing (1) is provided with a circuit (2), a button and an indicator light; The circuit (2) comprises a switch circuit (21), a rectifier circuit (22) and a discharge circuit (23), wherein the switch circuit (21), the rectifier circuit (22) and the discharge circuit (23) are connected in series; capacitors are arranged in series between the diodes of the rectifier circuit (22), and the rectifier circuit (22) is a rectifier circuit with an input of 220V AC and a rectified output of 600V DC; an AC contactor is arranged in parallel in the discharge circuit (23); The output end of the circuit (2) is provided with a jumper wire (3), and the end of the jumper wire (3) is provided with an annular jumper ring, and the size of the annular jumper ring matches the size of the transformer core lead wire; The input end of the circuit (2) is provided with an input port matching 220V AC power; The indicator light comprises a discharge indicator light and a power indicator light, wherein the power indicator light is connected in parallel with the AC contactor in the discharge circuit (23), and the discharge indicator light is connected in parallel with the rectifier circuit (22); The button is connected to the switch on the switch circuit (21).

2. The transformer core unstable grounding fault detector according to claim 1, characterized in that: The protective shell (1) is provided with a grounding interface, and the grounding interface is electrically connected to the ground of the circuit (2).

3. The transformer core unstable grounding fault detector according to claim 1, characterized in that: The annular overlapping ring is a circular conductive metal ring.

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