Ascending-free tester for current transformer (TA) polarity of switch

Abstract

The invention discloses an ascending-free tester for current transformer (TA) polarity of a switch. A group of normally open contacts of the power switch is connected with a testing button and a positive pole current terminal of a relay, a negative pole current terminal of the relay is connected with a positive pole of a primary output terminal, and a negative pole of the primary output terminal is connected with a negative pole of a battery to form a loop. According to the invention, the ascending-free tester for the current transformer (TA) polarity of the switch is used for testing the polarity, and the ascending-free operation is completely realized; original four testers are reduced to be one, so that a communication link is avoided, and the reliability of working is improved; and the portability of a test device is greatly improved.

Description

technical field [0001] The invention belongs to the field of relay protection in electric power engineering, and relates to a method for solving the polarity problem of testing a switching current transformer (hereinafter referred to as TA). Background technique [0002] 1. Current working methods [0003] Most of the 35 kV switches in the power system are outdoor vacuum switches. At present, the polarity of the switch TA is generally tested by using a light and a microammeter. The work is carried out by 4 people: one person ascends to the switch body and uses the light to switch on and off the primary current. , one person does the secondary wiring work on the switch terminal block, one person holds the microammeter to read the secondary current and record the test data, and one person is the general person in charge of the work and monitors the climbing operators. [0004] 2. Analysis of the problems in the current TA polarity test [0005] (1) Potential safety hazards o...

AI Technical Summary

Problems solved by technology

[0004] 2. Analysis of problems in the current TA polarity test

[0005] (1) Potential safety hazards of climbing

[0006] a. Mistouching live equipment: climbing the switch requires a ladder, and carrying the ladder in the equipment area increases the hidden danger of accidentally touching live equipment, and climbing to the switch body itself reduces the distance between the person and the wire. If the adjacent wire is charged, then prone to accidental touches;

[0007] b. Falling from high altitude: There is a danger of falling during the process of climbing, and all three phases of ABC and TA must be tested in the polarity test of the switch. The climber must move from phase A to phase B and C on the switch in sequence. Due to the relatively long distance between the phases, it must be undone. The safety belt can only move, and the protection is lost during the process, which poses a great safety hazard for falling from high altitudes;

[0008] c. Seat belt for low hanging and high use: There is no good safety belt fixing point on the switch body, and the porcelain bottle cannot bear the weight of a person, so it can only be fixed on the switch shell. Prohibited phenomenon;

[0009] (2) The reliability of the test results is low: During the polarity test, the primary wiring, the secondary wiring, and the secondary current meter reading judgment are completed by three people respectively. There are too many intermediate communication links, and personnel are required to work in a complex field environment. Repeatedly confirm that if there is a deviation in the communication of any link, the polarity of TA may be reversed, resulting in an error in the test result, which in turn leads to a serious accident in which the protection malfunctions and refuses to operate.

[0010] (3) The work requires a large number of personnel and the work efficiency is low

[0011] (4) The equipment is confusing and not easy to carry: the current polarity test equipment uses scattered tools that are simply made, and the lead-out wires of the battery are prone to positive and negative poles touching by mistake, resulting in short-circuit discharge of the battery, reducing battery life, and even causing a fire

[0012] (5) The adaptability of the equipment is poor: in the case of high TA variation, the use of commonly used batteries and ammeters may easily cause the deflection of the ammeter pointer to be insignificant, which will affect the judgment of personnel on the test results

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