Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

An electromagnetic voltage transformer primary winding tail end insulation detection method and device

A technology of voltage transformer and detection method, which is applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve problems such as voltage rise, transformer explosion, power grid accident occupation, etc., achieve high accuracy, simple detection circuit, and detection strong signal effect

Active Publication Date: 2018-10-02
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order to prevent ferromagnetic resonance, the electromagnetic voltage transformer for graded insulation is equipped with a silicon carbide resonance eliminator at the end of the primary winding. Under recovery, lightning strike and operating conditions, voltage will appear on the silicon carbide resonance eliminator, resulting in an increase in the voltage at the end of the primary winding of the electromagnetic voltage transformer
[0003] Because the ungrounded system uses a primary silicon carbide resonance eliminator to protect the ferromagnetic resonance of the electromagnetic voltage transformer, it is more common. According to statistics, after the installation of the primary resonance eliminator, the transformer explosion and Power grid accidents account for the vast majority
[0004] However, after the end of the primary winding of the electromagnetic voltage transformer is short-circuited with the end of the secondary winding or the iron core, because the resonance eliminator is a large resistance, the end of the primary winding and the secondary winding or the iron core and the grounding point do not form a loop, which hides Solved the insulation problem of the tail end of the primary winding of the electromagnetic voltage transformer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An electromagnetic voltage transformer primary winding tail end insulation detection method and device
  • An electromagnetic voltage transformer primary winding tail end insulation detection method and device
  • An electromagnetic voltage transformer primary winding tail end insulation detection method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see figure 2 , first follow the figure 1 Connect the detection device, the short-circuit switch 4 is connected to both ends of the open triangle winding 2 of the electromagnetic voltage transformer 1, the waveform acquisition module 6 is connected to the measurement or metering winding 3 of the electromagnetic voltage transformer 1, and the waveform acquisition module 6 is used for acquisition Measure or measure the three-phase voltage waveform of the winding 3 and synthesize the zero-sequence voltage waveform, set the resonance eliminator 9 at the end of the primary winding of the electromagnetic voltage transformer 1, connect the short switch 4 and the waveform acquisition module 6 to the control module 5, and the waveform The output terminal of the acquisition module 6 is connected with a judgment module 7, and the judgment module 7 analyzes the zero-sequence voltage when the short-circuit switch 4 is closed and the zero-sequence voltage after the short-circuit swit...

Embodiment 2

[0042] see figure 2 , first follow the figure 1 Connect the detection device, the short-circuit switch 4 is connected to both ends of the open triangle winding 2 of the electromagnetic voltage transformer 1, the waveform acquisition module 6 is connected to the measurement or metering winding 3 of the electromagnetic voltage transformer 1, and the waveform acquisition module 6 is used for acquisition Measure or measure the three-phase voltage waveform of the winding 3 and synthesize the zero-sequence voltage waveform, set the resonance eliminator 9 at the end of the primary winding of the electromagnetic voltage transformer 1, connect the short switch 4 and the waveform acquisition module 6 to the control module 5, and the waveform The output terminal of the acquisition module 6 is connected with a judgment module 7, and the judgment module 7 analyzes the zero-sequence voltage when the short-circuit switch 4 is closed and the zero-sequence voltage after the short-circuit swit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method and a device for testing tail end insulation of a primary winding of an electromagnetic voltage transformer, and aims to accurately and rapidly detect the insulation state of the tail end of a primary winding of an electromagnetic voltage transformer under a condition of electrification, achieve potential fault detection and detect the insulation state of the tailend of the primary winding according to zero sequence voltage variations caused when a vee connection winding of the electromagnetic voltage transformer is in short circuit. Short circuit switches areconnected with two ends of the vee connection winding of the electromagnetic voltage transformer, a waveform acquisition module is connected with a measuring or metering winding of the electromagnetic voltage transformer, the short circuit switches are controlled to be closed for a certain time and then cut off, at the same time three-phase voltage waveforms of the measuring or metering winding are acquired by using the waveform acquisition module and are combined to form zero sequence voltage waveforms, and the insulation state of the tail end of the primary winding connected with a harmonicwave eliminator, of the electromagnetic voltage transformer, is judged according to zero sequence voltages of the closed short circuit switches and the fluctuation situations of the zero sequence voltages of the closed short circuit switches.

Description

technical field [0001] The application specifically relates to a method and device for detecting insulation at the tail end of a primary winding of an electromagnetic voltage transformer, which is applicable to the technical field of live detection and on-line monitoring of the insulation state of the tail end after the electromagnetic voltage transformer is equipped with a primary resonance eliminator. Background technique [0002] In order to prevent ferromagnetic resonance, the electromagnetic voltage transformer for graded insulation is equipped with a silicon carbide resonance eliminator at the end of the primary winding. Under recovery, lightning strike and operating conditions, voltage will appear on the silicon carbide resonance eliminator, which will cause the voltage at the end of the primary winding of the electromagnetic voltage transformer to increase. [0003] Because the ungrounded system uses a primary silicon carbide resonance eliminator to protect the ferro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R35/02
CPCG01R31/1227G01R35/02
Inventor 刘红文王科李昊
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products