CN210665934U

CN210665934U - Impedance detection device

Info

Publication number: CN210665934U
Application number: CN201921388838.7U
Authority: CN
Inventors: 欧定军; 黄培刚; 谭飞
Original assignee: Shanghai Juter High Voltage Electrical & Equipment Co ltd
Current assignee: Shanghai Juter High Voltage Electrical & Equipment Co ltd
Priority date: 2019-08-24
Filing date: 2019-08-24
Publication date: 2020-06-02
Anticipated expiration: 2029-08-24

Abstract

The utility model relates to the technical field of partial discharge instrument detection, and discloses an impedance detection device, which comprises an INPUT port, a grounding port, a mutual inductor T2 and an ARC breakdown protection port, wherein an output terminal of the mutual inductor T2 is electrically connected with the ARC breakdown protection port; the electronic device SG1 is electrically connected with a transformer T2, an inductor L1 and a resistor R2 are connected in parallel to the electronic device SG1, a resistor R2 is connected in series with a resistor R1, a capacitor C1 and a transformer T1, a transformer T1 is electrically connected with the electronic device SG1, and a transformer T1 is electrically connected with a PD isolation signal output end; the electronic device SG1 is grounded through a resistor R4; the resistor R4 is electrically connected with a double HV voltage signal anti-surge protection output port through a resistor R3; the transformer T2 is used for achieving ARC breakdown protection signal output, the transformer T1 is used for achieving PD signal isolation output, grounding interference is reduced, double HV voltage signals are output in anti-surge protection mode, electrical isolation is achieved through the transformer, and anti-interference and high-energy performance of the transformer can be improved.

Description

Impedance detection device

Technical Field

The utility model relates to an appearance detection technical field is put in the office, and more specifically says that it relates to an impedance detection device.

Background

The partial discharge instrument can sense the high-frequency signals generated by the fault, vibration, leakage and electric partial discharge of the operating equipment. The method converts signals into audio signals by using a heterodyne method, enables users to hear the sounds through earphones, can vividly display discharge images by using an advanced visual ultrasonic principle and a delicate sensing technology, and informs maintenance personnel to overhaul in three modes of numbers, sounds and images, so that the safe operation of the GIS is ensured.

In the prior art, when partial discharge is generated under test voltage, pulse current is generated through a coupling capacitor, a pulse signal is picked up by an input unit, and after low-noise pre-amplification, filter amplifier selection of a required frequency band and main amplification, discharge pulse is displayed on an elliptic scanning baseline of an oscillographic screen and is also sent to a pulse peak value table to display the peak value of the discharge pulse.

However, in the prior art, the impedance detection part in the partial discharge instrument has no function of protecting components, and when the signal energy in the circuit is too high, the components inside the impedance detection part can be damaged.

SUMMERY OF THE UTILITY MODEL

Impedance detection part does not have the function of protection components and parts in putting the appearance to current office, and the too high technical problem who makes the inside components and parts of impedance detection part can be damaged to the signal energy in the circuit, the utility model provides an impedance detection device, it has the inside circuit that is provided with protection components and parts, can improve its anti-interference and high energy performance's advantage.

In order to achieve the above purpose, the utility model provides a following technical scheme:

an impedance detection device comprises an INPUT module and a filtering module which are sequentially connected, wherein the INPUT module comprises an INPUT port, a grounding port, a transformer T2 with four terminals and an ARC breakdown protection port, the INPUT port and the grounding port are respectively and electrically connected with two INPUT terminals of a transformer T2, one output terminal of the transformer T2 is electrically connected with the ARC breakdown protection port, and the other output terminal of the transformer T2 is electrically connected with the filtering module;

the filter module comprises an electronic device SG1, one end of the electronic device SG1 is electrically connected with one output terminal of a transformer T2, the electronic device SG1 is connected with an inductor L1 and a resistor R2 in parallel, one end of the resistor R2, which is electrically connected with the transformer T2, is sequentially connected with a resistor R1, a capacitor C1 and one input terminal of the transformer T1 in series, the other input terminal of the transformer T1 is electrically connected with the other end of the electronic device SG1, and the output end of the transformer T1 is electrically connected with a PD isolation signal output end; the other end of the electronic device SG1 is grounded through a resistor R4, and a filter capacitor C2 and a resistor R5 are connected in parallel with a resistor R4;

one end of the resistor R5 electrically connected with the transformer T1 is electrically connected with a double HV voltage signal anti-surge protection output port through a resistor R3.

Through above-mentioned technical scheme, input module inserts external measuring signal, uses mutual-inductor T2 to realize ARC and punctures protection signal output, and mutual-inductor T1 realizes PD signal isolation output, reduces ground interference, and double HV voltage signal prevents surge protection output in addition, utilizes the mutual-inductor to realize electrical isolation, can improve its anti-interference and high energy performance.

Further, a resistor R6 is electrically connected between the ARC breakdown protection port and the ground port of the input module.

Through the technical scheme, the resistor R6 can provide a stable voltage signal for the output of the ARC breakdown protection port.

Further, a common-mode inductor T3 and a common-mode inductor T4 are connected in series between the resistor R3 and the dual HV voltage signal anti-surge protection output port.

Through the technical scheme, the common-mode inductor T3 and the common-mode inductor T4 can suppress unbalanced signals and interference between the input and the output of the common-mode inductor, and the accuracy of output signals is improved.

Further, the common mode inductance T3 is consistent with the electrical parameters of the common mode inductance T4.

Through the technical scheme, the working states of the two common-mode inductors are the same, and the working load of the common-mode inductors is balanced.

Further, the resistor R2 is an adjustable resistor.

Through the technical scheme, the output range of the PD isolation signal output end can be adjusted.

Further, the resistor R4 is an adjustable resistor.

Through the technical scheme, the output range of the double-HV voltage signal anti-surge protection output port can be adjusted.

Further, the filter capacitor C2 is connected in parallel with the filter capacitor C3 and the filter capacitor C4.

Through the technical scheme, the filtering effect is better improved by the filter capacitor C2 and the filter capacitor C4.

Compared with the prior art, the beneficial effects of the utility model are that: the input module inserts external measuring signal, can realize ARC breakdown protection signal output with resistance R6 using mutual-inductor T2, and mutual-inductor T1 realizes PD signal isolation output, reduce ground interference, common mode inductance T3 and common mode inductance T4 can restrain the signal and the interference of input and output unbalance at common mode inductance in addition, promote output signal's the degree of accuracy, let two HV voltage signal prevent surge protection output more accurate, utilize the mutual-inductor to realize electrical isolation, can improve its anti-interference and high energy performance.

Drawings

Fig. 1 is a circuit diagram of the present invention.

Reference numerals: 1. an input module; 2. and a filtering module.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Examples

An impedance detection device, as shown in fig. 1, includes an input module 1 and a filtering module 2 connected in sequence. The INPUT module 1 comprises an INPUT port, a ground port, a transformer T2 with four terminals, and an ARC breakdown protection port, wherein the INPUT port and the ground port are electrically connected with two INPUT terminals of the transformer T2, respectively, one output terminal of the transformer T2 is electrically connected with the ARC breakdown protection port, a resistor R6 is electrically connected between the ARC breakdown protection port and the ground port of the INPUT module 1, and the resistor R6 can provide a stable voltage signal for the output of the ARC breakdown protection port. The other output terminal of the transformer T2 is electrically connected to the filter module 2. The input module 1 is connected with an externally measured signal, and the mutual inductor T2 is used for realizing ARC breakdown protection signal output.

The filtering module 2 comprises an electronic device SG1, and the electronic device SG1 is a mechanical switch or an electronic switch. One end of the electronic device SG1 is electrically connected to one output terminal of the transformer T2, and the electronic device SG1 has an inductor L1 and a resistor R2 connected in parallel. One end of the resistor R2 electrically connected with the transformer T2 is sequentially connected with a resistor R1, a capacitor C1 and one input terminal of the transformer T1 in series, the other input terminal of the transformer T1 is electrically connected with the other end of the electronic device SG1, and the output end of the transformer T1 is electrically connected with a PD isolation signal output end, wherein the resistor R2 is an adjustable resistor, so that the output range of the PD isolation signal output end can be adjusted. The mutual inductor T1 realizes PD signal isolation output and reduces grounding interference.

The other end of the electronic device SG1 is grounded via a resistor R4, and the resistor R4 is connected in parallel with a filter capacitor C2 and a resistor R5. The filter capacitor C2 is connected in parallel with a filter capacitor C3 and a filter capacitor C4, and the filter capacitor C2 and the filter capacitor C4 better improve the filter effect. One end of the resistor R5 electrically connected with the transformer T1 is electrically connected with a common mode inductor T3 and a common mode inductor T4 which are connected in series through a resistor R3, and the electrical parameters of the common mode inductor T3 and the common mode inductor T4 are consistent, so that the working states of the two common mode inductors are the same, and the working load of the common mode inductor is balanced. The common mode inductor T3 and the common mode inductor T4 can suppress unbalanced signals and interference at the input and output of the common mode inductor, and improve the accuracy of the output signal.

The resistor R3 is electrically connected with the double-HV voltage signal anti-surge protection output port through the common-mode inductor T3 and the common-mode inductor T4, wherein the resistor R4 is an adjustable resistor, so that the output range of the double-HV voltage signal anti-surge protection output port can be adjusted. The double HV voltage signals are output in anti-surge protection, and are electrically isolated by using the mutual inductor, so that the anti-interference and high-energy performance of the transformer can be improved.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An impedance detection device is characterized by comprising an INPUT module (1) and a filtering module (2) which are sequentially connected, wherein the INPUT module (1) comprises an INPUT port, a ground port, a transformer T2 with four terminals and an ARC breakdown protection port, the INPUT port and the ground port are respectively and electrically connected with two INPUT terminals of a transformer T2, one output terminal of the transformer T2 is electrically connected with the ARC breakdown protection port, and the other output terminal of the transformer T2 is electrically connected with the filtering module (2);

the filtering module (2) comprises an electronic device SG1, one end of the electronic device SG1 is electrically connected with one output terminal of a transformer T2, the electronic device SG1 is connected with an inductor L1 and a resistor R2 in parallel, one end of the resistor R2, which is electrically connected with the transformer T2, is sequentially connected with a resistor R1, a capacitor C1 and one input terminal of the transformer T1 in series, the other input terminal of the transformer T1 is electrically connected with the other end of the electronic device SG1, and the output end of the transformer T1 is electrically connected with a PD isolation signal output end; the other end of the electronic device SG1 is grounded through a resistor R4, and a filter capacitor C2 and a resistor R5 are connected in parallel with a resistor R4;

2. Impedance detection device according to claim 1, characterized in that a resistor R6 is electrically connected between the ARC breakdown protection port and the ground port of the input module (1).

3. The impedance detection device according to claim 1, wherein a common mode inductor T3 and a common mode inductor T4 are connected in series between the resistor R3 and the dual HV voltage signal anti-surge protection output port.

4. The impedance detection device of claim 3, wherein the common mode inductance T3 is consistent with the electrical parameters of the common mode inductance T4.

5. The impedance detection device according to claim 1, wherein the resistor R2 is an adjustable resistor.

6. The impedance detection device according to claim 1, wherein the resistor R4 is an adjustable resistor.

7. The impedance detecting device according to claim 1, wherein the filter capacitor C2 is connected in parallel with the filter capacitor C3 and the filter capacitor C4.