Monitoring method for short-circuit fault between stator core and through-hole screw of synchronous generator

A synchronous generator and stator core technology, applied in short-circuit testing, measuring electricity, measuring devices, etc., can solve the problems of inability to respond sensitively to short-circuit faults, failure to detect faults in time, and short-circuit faults of stator slots, and achieve full coverage detection. , The effect of preventing large-scale melting of the stator core and finding faults in time
CN106771820BActive Publication Date: 2021-02-19NORTH CHINA ELECTRIC POWER UNIV (BAODING)
6 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2021-02-19

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for monitoring a short-circuit fault between a stator core and a cross-core threaded rod in a synchronous generator. A high-resistance resistor and a sampling resistor are connected with the ground, wherein the high-resistance resistor and the sampling resistor are in series connection and connected to the cross-core threaded rod which is arranged in the stator core in the synchronous generator; a momentary value of voltage across two ends of the sampling resistor are collected online, the momentary value of the voltage is compared with a fault determining threshold value, and when the momentary value of the voltage exceeds the fault determining threshold value, it is determined that the short-circuit fault occurs between the stator core and the cross-core threaded rod in the synchronous generator. The method can solve the deficiency in the prior art and improve the diagnostic ability of such faults.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of generators, in particular to a monitoring method for a short-circuit fault between a stator iron core and a through-hole screw of a synchronous generator. Background technique

[0002] The stator core of the synchronous generator is made of silicon steel punched sheets stacked together. In order to prevent the core punched sheets from shifting and vibrating during operation and cutting the insulation of the stator winding, it is necessary to apply axial pressure to the core punched sheets with the help of a through-core screw to make the core punched sheets fasten. In order to prevent overheating damage caused by local eddy current or circulating current caused by the short circuit of the iron core punching sheet, an insulating material is set between the core screw and the punching sheet, see figure 1 .

[0003] In order to avoid the short circuit of the core screw through the pressure ring and other s...

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