Transformer partial discharge ultrahigh frequency locating analyzer and locating analyzing method thereof

A technology of partial discharge and analysis method, applied in the direction of testing dielectric strength, etc., can solve the problem that the positioning circuit is difficult to lock the distance between the discharge source and the UHF sensor, the transformer is inconvenient to maintain, and the specific location of the transformer fault point cannot be obtained, so as to achieve isolation. The noise effect is good, the stability coefficient is improved, and the filter frequency bandwidth is improved.

Active Publication Date: 2013-12-25
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fast propagation speed of the UHF signal, it is difficult to lock the distance between the discharge source and the UHF sensor by using a general positioning circuit, and it is impossible to obtain the specific location of the fault point of the transformer, which brings some inconvenience to the maintenance of the transformer.

Method used

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  • Transformer partial discharge ultrahigh frequency locating analyzer and locating analyzing method thereof
  • Transformer partial discharge ultrahigh frequency locating analyzer and locating analyzing method thereof
  • Transformer partial discharge ultrahigh frequency locating analyzer and locating analyzing method thereof

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Embodiment 1

[0037] Such as figure 1 As shown, the transformer partial discharge UHF positioning analyzer of this embodiment includes a signal conditioning unit 1 for receiving the discharge signal collected by the probe and conditioning the received discharge signal, and a signal processing unit 3 for calculating the discharge distance 1. The fine delay unit 2 that delays the adjusted discharge signal, the above fine delay unit is also connected with the signal processing unit 3, and the delayed signal is sent to the signal processing unit 3 and the delay of the receiving signal processing unit 3 time control signal.

[0038] Wherein, the signal conditioning unit 1 includes at least 4 independent signal conditioning modules; the above-mentioned fine delay unit 2 includes at least one independent fine delay module; the above-mentioned signal processing unit 3 includes at least one set of independent delay signal output ports and road signal Input interface; the number of the above-mention...

Embodiment 2

[0040] Such as figure 2 as shown, figure 2 It is the circuit schematic diagram of the fine delay module. On the basis of Embodiment 1, each group of delay signal output ports in this embodiment includes a first delay signal output pin and a second delay signal output pin; the above-mentioned fine delay module is composed of the first JK flip-flop 21 and the second JK flip-flop 22 are connected to form; the J input end of the first JK flip-flop 21 is connected to the signal conditioning module, the Q output end is connected to the J input end of the second JK flip-flop 22, and the CP input end is connected to the delay signal The first delayed signal output pin of the output port is connected; the Q output terminal of the above-mentioned second JK flip-flop 22 is connected with the signal processing unit 3, and the K input terminal is connected with the second delayed signal output pin of the delayed signal output port . In this embodiment, the frequency of the output sign...

Embodiment 3

[0042] image 3 It is a schematic circuit diagram of a signal conditioning module. On the basis of Embodiment 1 or 2, the signal conditioning module includes a filter circuit, an isolation circuit, and an amplifier circuit connected in sequence. The above filter circuit is a third-order filter circuit with a passband of 400M to 700M. The circuit specifically includes inductor L2, inductor L3, inductor L4, capacitor C14, capacitor C15, capacitor C16, and capacitor C26. Among them: inductor L2, inductor L3, capacitor One end of C14 is connected to the input signal; the other end of inductor L2 and capacitor C14 is grounded; the inductor L3, capacitor C15, and capacitor C26 are connected in series; the inductor L4 and capacitor C16 are connected in parallel, and one end is connected between capacitor C15 and capacitor C26, and the other end is grounded ; The capacitor C14, capacitor C15, and capacitor C16 are non-inductive capacitors of 100 pF, and the inductor L2, inductor L3, a...

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Abstract

The invention discloses a transformer partial discharge ultrahigh frequency locating analyzer and a locating analyzing method thereof. The transformer partial discharge ultrahigh frequency locating analyzer comprises a signal conditioning unit (1), a signal processing unit (3), a precise time-delay unit (2), wherein the signal conditioning unit (1) is used for receiving the discharge signals collected by a probe and carrying out conditioning on the received discharge signals, the signal processing unit (3) is used for calculating a discharge distance, the precise time-delay unit (2) is used for carrying out time delay on the conditioned discharge signals, and the refined time-delay unit (2) is further connected with the signal processing unit (3), sends the delayed signals to the signal processing unit (3), and receives the time-delay control signals of the signal processing unit (3). According to the transformer partial discharge ultrahigh frequency locating analyzer and the locating analyzing method thereof, a normal sampling circuit can carry out sampling analysis on high-frequency discharge signals through the time-delay technology, and the transformer partial discharge ultrahigh frequency locating analyzer and the locating analyzing method thereof have the advantages of being low in circuit manufacturing cost, good in stability coefficient, convenient to control and the like.

Description

technical field [0001] The invention relates to the technical field of transformer discharge monitoring, in particular to a transformer partial discharge UHF positioning analyzer and a positioning analysis method thereof. Background technique [0002] Partial discharge is one of the main causes of transformer insulation aging or deterioration or even destruction. The research on transformer partial discharge detection and diagnosis has far-reaching theoretical significance and extensive practical value. In addition, in the manufacturing process of high-voltage equipment, it is also necessary to use the detection of partial discharge to assess the insulation status of the product. In the partial discharge detection of transformers, the ultra-high frequency (UHF) detection method has the advantages of strong anti-interference ability and high sensitivity, and is suitable for on-site detection of partial discharge of transformers. However, due to the fast propagation speed of ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 刘凡刘睿彭倩李旻王京保徐丽媛刘伟张昀
Owner STATE GRID CORP OF CHINA
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