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

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...

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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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