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

A detection method for voltage transformer disconnection

A technology of a voltage transformer and a detection method is applied in the field of detecting the disconnection of a voltage transformer for protection of a pumped-storage generator by a voltage balance method, which can solve the problems of difficulty in detecting the disconnection of the voltage transformer, and achieves wide application and reliability. High and simplified effect of disconnection detection method

Active Publication Date: 2016-03-16
STATE GRID CORP OF CHINA +2
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that voltage transformer disconnection is difficult to detect, and propose a voltage transformer disconnection detection method suitable for pumped storage power station generator protection with various wiring modes, which has wide application and high reliability. It is convenient to implement on general microcomputer protection

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
  • A detection method for voltage transformer disconnection
  • A detection method for voltage transformer disconnection
  • A detection method for voltage transformer disconnection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Such as figure 1 As shown, it is the wiring method of the generator terminal voltage transformer (hereinafter referred to as PT) commonly used in the pumped storage power station. The phase voltage measured by the generator terminal PT is converted from an analog signal to a digital signal after the filter circuit. Calculated to obtain PT1 line voltage U 1 AB , U 1 BC , U 1 CA , and PT2 line voltage U 2 AB , U 2 BC , U 2 CA . The above voltages enter the voltage balance comparison module, respectively for U 1 AB and U 2 AB , U 1 BC and U 2 BC , U 1 CA and U 2 CA Calculate and test.

[0029] with U 1 AB and U 2 AB For example:

[0030] To PT1 line voltage U 1 AB Calculate the vector R 1AB +JX 1AB , calculate U according to the vector 1 AB Amplitude:

[0031] | U ...

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 detection method for disconnection of voltage transformers. Two voltage transformers are applied to generator protection in a pumped-storage power station, and include a first voltage transformer in a power generation direction and a second voltage transformer in a pumping direction. The detection method for disconnection of the voltage transformers comprises the following steps of: collecting voltage signals from the first and second voltage transformers; working out voltages U1AB, U1BC, U1CA, U2AB, U2BC and U2CA; working out voltage amplitude differences of lines of the two voltage transformers [delta]UAB, [delta]UBC and [delta]UCA, and judging whether the voltage transformers are in disconnection. The detection method can be applied to various connection modes at the generator end of the pumped-storage power station, and is simplified in detection on disconnection of the voltage transformers in various connection modes, wide in application range, high in reliability, and convenient to implement general microcomputer protection.

Description

technical field [0001] The invention relates to a detection method for disconnection of a voltage transformer at the machine end of a generator (regardless of the direction of power generation or the direction of water pumping), in particular to a voltage balance method for detecting disconnection of a voltage transformer for protection of a pumped storage generator method. Background technique [0002] At present, the task of the voltage transformer is to accurately transform the primary side voltage to the allowable voltage of the relay protection and the secondary instrument, so that the relay protection device and the instrument can not only work under low voltage conditions, but also accurately reflect the power system. Operation of medium and high voltage equipment. [0003] In a pumped storage power station, since the unit operates in two different working conditions of power generation and water pumping, the voltage transformers for generator protection are also set...

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): G01R31/02
Inventor 朱冠宏王霆于辉孟繁聪徐伟宋晋红王莉蒋洁青陆婷
Owner STATE GRID CORP OF CHINA
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com