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Method for automatically measuring direct-current resistor, short-circuit impedance, on-load switch and non-load voltage ratio of transformer

An automatic measurement and transformer technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as multiple disconnections, and achieve the effect of improving work efficiency, reducing measurement errors, and reducing work intensity

Active Publication Date: 2013-10-23
HANGZHOU XIHU ELECTRONICS INST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problem of disconnecting wires many times in the test process when measuring the DC resistance of the power transformer, on-load tap changer, transformation ratio and short-circuit impedance, the present invention proposes a method for automatic measurement based on digital measurement

Method used

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  • Method for automatically measuring direct-current resistor, short-circuit impedance, on-load switch and non-load voltage ratio of transformer
  • Method for automatically measuring direct-current resistor, short-circuit impedance, on-load switch and non-load voltage ratio of transformer
  • Method for automatically measuring direct-current resistor, short-circuit impedance, on-load switch and non-load voltage ratio of transformer

Examples

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Embodiment Construction

[0049] The following takes a three-winding large-scale transformer as an example to illustrate how to perform automatic measurements.

[0050] figure 1 In order to measure the wiring diagram of large-scale three-winding transformer direct resistance, on-load tap changer, short-circuit impedance and transformation ratio, the part of the power transformer under test is in the dotted line box 1, and the content of the invention is in the dotted line box 2. In the figure, it can be seen that each winding outlet of the transformer is divided into two paths, which are respectively connected to a high-voltage switch, one path is a voltage signal, and the other path is a current signal. During the measurement process, the state of the transformer winding during the measurement process can be realized by controlling the opening and closing state of the high-voltage switch: pressurization or open circuit or short circuit or grounding. Select the current measurement item by controlling ...

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Abstract

The invention discloses a method for automatically measuring a direct-current resistor, a short-circuit impedance, an on-load switch and a non-load voltage ratio of a transformer. In the measurement process, the opening-and-closing status of a high-pressure switch can be controlled so as to achieve the status of a transformer winding in the measurement process, and the status is pressurization or an open circuit or a short circuit or grounding. The current measuring item is selected by controlling a multi-way selection switch, and the item is the direct-current resistor or the on-load tapping switch or the short-circuit impedance or the non-load voltage ratio. The method can achieve automatic measurement of the direct-current resistor, the on-load tapping switch, the non-load voltage ratio and the short-circuit impedance of the power transformer, the winding status is automatically switched in the whole measurement process, manual intervention is not required, the measurement error can be reduced, working intensity can be relieved, and working efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of power equipment measurement and relates to a method for automatically measuring the DC resistance of a power transformer, an on-load tap changer, a short-circuit impedance and a transformation ratio. Background technique [0002] The power transformer is the main equipment of the power system, which is of great significance to the safe and reliable operation of the power grid. It is clearly pointed out in the eighteen major power grid anti-accident measures of the State Grid that strengthening the on-load tap-changer test and short-circuit impedance test is essential for preventing major transformer insulation accidents. has great significance. In addition, DC resistance test and transformation ratio test, as routine transformer test items, are indispensable test items after transformer handover, overhaul and change of tap changer, and are also important inspection items after failure. [0003] According...

Claims

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Application Information

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IPC IPC(8): G01R35/02G01R29/20G01R31/02
Inventor 胡维兴
Owner HANGZHOU XIHU ELECTRONICS INST
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