CN214097740U

CN214097740U - N600 secondary circuit ground fault rapid detection circuit

Info

Publication number: CN214097740U
Application number: CN202022995593.3U
Authority: CN
Inventors: 邓嘉豪; 苏永昌; 叶振鸿; 付伦齐
Original assignee: Hangzhou Dingyi Electronic Technology Co ltd
Current assignee: Hangzhou Dingyi Electronic Technology Co ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-08-31
Anticipated expiration: 2030-12-11

Abstract

The utility model discloses a quick detection circuitry of N600 secondary circuit ground fault, at least including isolation transformer T1, electric capacity C1, first diode LED1 and second diode LED2, isolation transformer T1's input is used for coupling secondary circuit live wire and earth connection, and the one end of electric capacity C1 is coupled to first output, and the second output is coupled with the positive pole of first diode and the negative pole of second diode, the negative pole of first diode and the positive pole of second diode and the other end of electric capacity C1 are coupled; the problems that an N600 secondary circuit grounding detection circuit is complex and high in cost are solved, and whether ungrounded or multipoint grounding faults exist can be rapidly judged through rapid and convenient installation operation.

Description

N600 secondary circuit ground fault rapid detection circuit

Technical Field

The utility model relates to an electrical technology field, concretely relates to N600 secondary circuit ground fault short-term test circuit.

Background

As shown in fig. 1, for the conventional N600 multipoint ground detection scheme, 1 constant current source with a small secondary value is generally injected into a point a between an output zero line and a ground line of the N600, and then a current transformer C measures a current value on a ground line B of the N600 itself to determine whether the current value is the same as the constant current source. If they are the same, it means that there are only these 1 ground points; if the amplitudes are different, the other connecting wires are simultaneously provided with a plurality of grounding points. The circuit of the scheme of the invention is complex and has high cost, and 1 constant current source generating circuit, a power supply circuit, a mutual inductor sampling circuit and a judgment circuit are needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a quick detection circuitry of N600 secondary circuit ground fault for it is complicated to solve N600 secondary circuit ground fault detection circuitry, the higher problem of cost.

The utility model provides a pair of N600 multiple spot earth fault short-term test circuit, at least including isolation transformer T1, electric capacity C1, first diode LED1 and second diode LED2, isolation transformer T1's input is used for coupling secondary circuit live wire and earth connection, and electric capacity C1's one end is coupled to first output, and the second output is coupled with the positive pole of first diode and the negative pole of second diode, the negative pole of first diode and the positive pole of second diode are coupled with electric capacity C1's the other end.

Further, the capacitor C1 is a high voltage resistant dc blocking capacitor.

Further, the first diode LED1 and the second diode LED2 are both high-brightness light emitting diodes.

Further, the detection circuit is connected with the live wire and the ground wire of the secondary circuit, and the first diode LED1 and the second diode LED2 are lighted to indicate the N600 secondary circuit ground fault.

Further, the N600 secondary circuit ground is disconnected and diodes LED1 and LED2 continue to illuminate to indicate multiple ground faults.

The utility model has the advantages of as follows:

1. the isolation transformer is used for isolation, so that the safety of operators is guaranteed, and the secondary circuit is not directly influenced even if the device is damaged.

2. The installation operation is fast and convenient, and whether ungrounded and multipoint grounding faults exist or not is fast judged;

3. the circuit is simple, the ground fault is rapidly detected, and the cost of detecting the ground fault of the N600 secondary circuit is reduced.

Drawings

FIG. 1 is a prior art N600 multiple point ground detection scheme;

fig. 2 is a schematic circuit diagram according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the operation wiring of the embodiment of the present invention;

fig. 4 is a schematic view of the embodiment of the present invention for disconnecting the secondary circuit ground wire.

Detailed Description

For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.

According to the safety requirements, a voltage secondary loop in a transformer substation has one grounding point, so that the branch of the voltage transformer secondary loop N600 has only one grounding point for ensuring the safety of personnel and equipment.

An object of the utility model is to provide a quick detection circuitry of N600 secondary circuit ground fault, it is complicated to have solved current N600 secondary circuit multiple spot ground connection detection circuitry scheme, the higher problem of cost.

In the embodiment of the present invention as shown in fig. 1, an N600 multipoint ground fault fast detection circuit includes at least an isolation transformer T1, a capacitor C1, a first diode LED1 and a second diode LED2, wherein an input terminal of the isolation transformer T1 is used for coupling a live wire and a ground wire of a secondary circuit, a first output terminal is coupled to one end of the capacitor C1, a second output terminal is coupled to an anode of the first diode and a cathode of the second diode, and the cathode of the first diode and the anode of the second diode are coupled to the other end of the capacitor C1.

The capacitor is a high-voltage blocking capacitor, and the first diode and the second diode are high-brightness light-emitting diodes. The current is limited by using the capacitance in the AC loop to present larger capacitive reactance, so that the high-brightness LED which can emit light by small current is lightened. As shown in fig. 3, the embodiment of the present invention shown in fig. 1 is wired between the secondary circuit live wire and the ground wire. The first diode LED1 and the second diode LED2 are illuminated indicating that the N600 secondary circuit has been grounded, otherwise indicating that there is an ungrounded fault with the N600 secondary circuit. In the case where the N600 secondary circuit is already grounded and the first diode LED1 and the second diode LED2 emit light, the N600 ground line itself is disconnected, as shown in fig. 4, if the first diode LED1 and the second diode LED2 emit light continuously, it indicates that there are a plurality of grounding points and it is necessary to check the grounding points, and if the light does not emit light continuously, it indicates that there is only one grounding point.

The utility model discloses a N600 secondary circuit earth fault short-term test circuit, the circuit is simple, and is quick to fix a position not earth fault and multiple spot earth fault. The installation and operation are convenient, and the cost of fault detection is reduced. Meanwhile, the isolation transformer is adopted to ensure the safety of operators, and the secondary circuit cannot be directly influenced even if the device is damaged.

The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The N600 secondary circuit ground fault rapid detection circuit is characterized by at least comprising an isolation transformer T1, a capacitor C1, a first diode LED1 and a second diode LED2, wherein the input end of the isolation transformer T1 is used for being coupled with a live wire and a ground wire of a secondary circuit, the first output end of the isolation transformer T1 is coupled with one end of a capacitor C1, the second output end of the isolation transformer T1 is coupled with the anode of the first diode and the cathode of the second diode, and the cathode of the first diode and the anode of the second diode are coupled with the other end of a capacitor C1.

2. The detection circuit of claim 1, wherein the capacitor C1 is a high voltage resistant blocking capacitor.

3. The detection circuit of claim 1, wherein the first diode LED1 and the second diode LED2 are both high brightness light emitting diodes.

4. The detection circuit of claim 1, wherein the detection circuit is coupled to a ground line and a live line of the secondary circuit, and wherein the first diode LED1 and the second diode LED2 are illuminated to indicate an N600 secondary circuit ground fault.

5. The detection circuit of claim 3, wherein the N600 secondary circuit ground is disconnected and the LEDs 1 and 2 are illuminated to indicate multiple ground faults.