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Method of fast measuring direct current resistance of power transformer using excitation vibration

A technology of power transformers and DC resistors, which is applied in the fields of electrical engineering and electronics, can solve problems such as complex on-site operations, difficulty in measuring accurate values, and long measurement time, so as to reduce labor intensity, reduce power outage time, and improve work efficiency. efficiency effect

Inactive Publication Date: 2004-10-20
王永顺
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Problems solved by technology

[0003] In field work, it is very difficult to measure the DC resistance of the low-voltage winding of a dry-type transformer with a double-arm bridge
It takes about 2 to 3 hours to measure directly, and it is difficult to measure an accurate value
Using the resistance mutation method can achieve a certain effect, but the effect is still not ideal, and it cannot be widely used due to the complicated on-site operation and high technical level requirements.
Using the method of charging with a large current and constant current source to measure dry-type transformers can achieve good results, but it must be measured with the help of an external power supply, which is subject to certain restrictions at the work site. For transformers that are charged with a large current and constant current source It usually takes 30 minutes for a resistance tester to measure the DC resistance of a large transformer with a long time constant by using the magnetic method.
In a word, using existing instruments and adopting existing methods, there is a problem of longer measurement time in varying degrees for measuring transformer DC resistance with longer time constant

Method used

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  • Method of fast measuring direct current resistance of power transformer using excitation vibration
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  • Method of fast measuring direct current resistance of power transformer using excitation vibration

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Embodiment Construction

[0033] The specific embodiment of the present invention is further described below in conjunction with figure:

[0034] Using QJ 44 The double-arm bridge circuit is used to measure the SCL2-1250 / 6 dry-type transformer with a capacity of 1250KVA and a voltage level of 6 / 0.4 (KVA). First, press figure 1 Wiring, and check that the wiring is correct, the wires are reliably connected, and the wires connected to the current terminals (C1, C2) should be connected to the outside of the measurement winding, and the wires connected to the voltage terminals (P1, P2) should be connected to the inside of the measurement winding. Note that the wires connected to the voltage terminals (P1, P2) should be as short as possible and have sufficient cross-section, and then connect QJ 44 The power switch of the double-arm bridge charges the measured winding of the transformer. After about 5-10 seconds, operate the non-measurement winding short-circuit grounding lead switch (K), and quickly switc...

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Abstract

A method for quickly measuring the DC resistance of electric power transformer by use of excited oscillation features that when the transformer is charged for said measurement, the electromagnetic energy induced in the winding not to be measured is used for fast charge or discharge to make the charge current of the winding to be measured quickly reach a stable value in impact oscillation mode for realizing fast and correct measurement of its DC resistance.

Description

technical field [0001] The invention relates to the fields of electrical engineering and electronics, in particular to a method for quickly measuring the DC resistance of a power transformer by using excitation oscillation. Background technique [0002] At present, the instruments for measuring the DC resistance of power transformers mainly include: (1) a double-arm bridge DC resistance tester with a built-in battery that is manually adjusted; tester. The main methods for measuring the DC resistance of power transformers are: (1) It is a direct measurement method. That is: the method of directly measuring the DC resistance of the winding of the transformer with a measuring instrument. (2) is the resistance mutation method. That is: the method of increasing the additional resistance of the transformer to measure the winding. (3) It is a method of charging with a large current constant current source. That is: to measure the method of passing a large current through the w...

Claims

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Application Information

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IPC IPC(8): G01R27/02
Inventor 王永顺
Owner 王永顺
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