Transformer cooler cold control power loss time constant value test method

Abstract

The invention provides a transformer cooler cold control power loss time constant value test method. The method comprises the following steps: detecting a test environment; triggering a first preset circuit switching-on condition, enabling a cold control power loss power supply loop, a cold control power loss control loop and a cold control power loss time constant value setting logic circuit to be switched on, and obtaining a time length from triggering to tripping through a cold control power loss fixed time delay device to calculate a delay constant value of a time relay on the cold controlpower loss control loop; if the delay constant value of the time relay is not 0, adjusting the value to 0, continuing to trigger a second preset circuit switching-on condition, and obtaining a time length from triggering to tripping through a cold control power loss delay relay to calculate the delay constant value of the cold control power loss delay relay; and if the delay constant value of thecold control power loss delay relay is less than or equal to a set time, determining that the cold control power loss time reaches the standard, and otherwise, determining that the cold control powerloss time does not reach the standard and adjustment is needed. By implementing the invention, the constant value of the cold control power loss time of the transformer cooler is effectively monitored and ensured to be less than or equal to the full-stop setting time of the transformer cooler.

Description

technical field [0001] The invention relates to the technical field of transformer testing, in particular to a method for testing the fixed value of the cooling control power-off time of a transformer cooler. Background technique [0002] Such as figure 1 Shown is a schematic diagram of the external primary side wiring of the transformer. The transformer is connected to different busbars through three-side circuit breakers 1DL, 2DL, 3DL and corresponding isolating switches 1G, 2G, 3G to realize variable voltage power supply. However, once a fault occurs inside the transformer, the oil temperature will rise rapidly. Sometimes the cooling system also has a failure phenomenon of cutting off all the coolers and if it is maintained for too long, it will cause serious damage to the transformer. [0003] According to DL / T 572-95 "Power Transformer Operation Regulations": strong oil circulation air-cooled and strong oil circulation water-cooled transformers, when the cooling syste...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the embodiments of the present invention is to provide a test method for the fixed value of the cooling control power-off time of the transformer cooler, which can effectively monitor the fixed value of the cold control power-off time of the transformer cooler and ensure that it is less than or equal to the time when the transformer cooler is completely stopped. Set the time, so as to avoid the problem of non-tripping or delayed tripping of the three-side circuit breaker of the transformer under the long-term high temperature of the transformer, and improve the safety of the power grid operation

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