Oil-oil bushing cable outlet transformer test method without head removing

A test method and cable outlet technology, applied in the field of transformers, can solve problems such as failure to perform normally and inconvenient disassembly of transformers, and achieve the effects of ensuring safety, reducing equipment power outage time, and improving test efficiency

Inactive Publication Date: 2014-09-24
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a test method without removing the head of the oil-oil bushing cable outlet transformer, which solves the problem that some conventional tests cannot be carried out normally due to the inconvenience of removing the head of the transformer with the oil-oil casing cable outlet The problem

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  • Oil-oil bushing cable outlet transformer test method without head removing

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0014] A test method for oil-oil bushing cable outlet transformer without removing the head, such as figure 1 shown, including the following steps:

[0015] Step 1. Perform the DC resistance test on the high voltage side: disconnect the isolating switch on the high voltage side busbar, close the grounding switch, open the grounding connection piece, and use a DC resistance tester at the grounding switch (test point 1) to conduct a DC resistance test on the high voltage side .

[0016] In this embodiment, a three-phase double-winding transformer is taken as an example, wherein the high-voltage side of the transformer adopts an oil-and-oil bushing cable outlet type.

[0017] Step 2. Carry out the insulation resistance, absorption ratio and polarization index test of the high-voltage side to the low-voltage side: restore the grounding connection piece, turn on the grou...

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Abstract

The invention relates to an oil-oil bushing cable outlet transformer test method without head removing. The method is characterized by comprising the following steps: high-voltage side direct-current resistance test: the high-voltage side direct-current resistance is tested at a grounding switch after the grounding switch is closed and a grounding connection piece is opened; test of the insulation resistance, the absorption ratio and the polarization index of a high-voltage side to a low-voltage side: the test is carried out at a transformer high-voltage neutral point bushing by a tramegger; test of the dielectric loss and the capacitance of the high-voltage side to the low-voltage side: the test is carried out by applying alternating-current high voltage to the transformer high-voltage neutral point bushing; and test of the dielectric loss and the capacitance of each bushing at the high-voltage side: a high-voltage dielectric loss meter and a forward connection method are adopted, alternating-current high voltage is applied to the transformer high-voltage neutral point bushing, and signals are extracted from the end screen of the bushing of each phase to carry out testing. The equipment power-off time is greatly reduced, the test efficiency is improved, safe and stable operation of transformers and a power grid are ensured, and the operation reliability of the power grid is ensured.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a test method for an oil-oil bushing cable outlet transformer without removing the head. Background technique [0002] For oil-and-oil bushing cable outlet transformers, in routine tests, the on-site processes required to remove and restore the connection between the transformer and the XLPE cable are very complicated (such as vacuum oil filling, moisture and dust protection), resulting in longer power outages for equipment , thus affecting the power supply reliability index and greatly increasing the workload of field test personnel. In addition, removing and restoring cables may have adverse effects on XLPE XLPE cables and transformer bushings, such as increase in contact resistance, damage to cable insulation, etc., which is even more detrimental to the safe operation of equipment. Contents of the invention [0003] The purpose of the present invention is to overcome t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/02G01R27/26
Inventor 王楠唐庆华王伟刘宝成满玉岩郗晓光张弛
Owner STATE GRID CORP OF CHINA
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