Method for monitoring resistant current in leakage current of an arrester

A technology of resistive current and leakage current, applied in the direction of measuring current/voltage, measuring electrical variables, instruments, etc., can solve problems such as insensitivity, error of measurement results, offset, etc., and achieve the effect of improving reliability and avoiding accidents
CN1991395AInactive Publication Date: 2007-07-04SHANGHAI ELECTRICGROUP CORP
0 Cites 22 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI ELECTRICGROUP CORP
Publication Date
2007-07-04
Estimated Expiration
Not applicable · inactive patent

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 the resistance current of leakage current in lightning arrester that includes following steps: collects the whole leakage current through the lightning arrester; the whole leakage current is divided into the resistance current and the capacitive current; and the two kinds of current are scaled to mA grade; decides the time that two current thorough the zero point, and measures the average value of the resistance current and the capacitive current at the same time, and the value is as the original standard value; measures the max value of two kinds of current at power frequency 20ms, and records the change of current, and compares the difference of change rate of current; when the current change of instantaneous max value is keep constant rising, and detects the value is reach the 10% of original standard value; If the said detection result is true, and then the resistance element is changed to make the average value of the capacitive current return to the original standard value, and detects the average value of the resistance current. The method can obtain the change trend of resistance current when the lightning arrester is degraded seriously.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The invention relates to an on-line monitoring method for leakage current in the operation of high-voltage electrical equipment, in particular to an AC gapless 110KV metal zinc oxide lightning arrester, which uses the analysis of the leakage current (also called full current) of the arrester to obtain the resistance An on-line detection method based on the value of the electrical current. Background technique

[0002] Zinc oxide arrester is a kind of protective equipment to protect electrical equipment from overvoltage. Due to the superior non-linear characteristics and good current flow capacity of zinc oxide arresters, they have been accepted and widely used by users in the power sector. However, with the large-scale use of zinc oxide arresters, the occurrence of accidents in the arrester itself leads to the occurrence of protected electrical equipment. Damage and electrical accidents have also occurred, especially zinc oxide arresters with voltage levels...

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