Reliable operation method of single-phase air-cooled transformer temperature control box

Abstract

The invention discloses a reliable operation method of a single-phase air-cooled transformer temperature control box. The method comprises the following steps: providing a first temperature measurement RTD, a second temperature measurement RTD, a third temperature measurement RTD and a fourth temperature measurement RTD, and setting the first temperature measurement RTD, the second temperature measurement RTD, the third temperature measurement RTD and the fourth temperature measurement RTD at the same temperature measurement point of the single-phase air-cooled transformer. According to the method, comparison is carried out based on temperature of a plurality of temperature measurement RTDs, the output of the alarm and trip contacts is jointly controlled by the temperature of the two temperature measuring RTDs, when one temperature measurement RTD fails, the temperature control box compares and analyzes the failed temperature measurement RTD and the temperature measurement RTD on the normal winding, and finally the output function of the failed temperature measurement RTD is locked. When one group of temperature measurement RTDs fails, the temperature protection of the phase transformer is not influenced, andthe failed temperature measurement RTD can be replaced with the standby temperature measurement RTD on the premise of not stopping the primary equipment to improve the reliability so that the operation reliability of the temperature control box is improved, and the unplanned shutdown of the primary equipment is avoided.

Description

technical field [0001] The invention belongs to the technical field of non-electricity protection of single-phase air-cooled transformers, and in particular relates to a reliable operation method for a temperature control box of single-phase air-cooled transformers. Background technique [0002] Single-phase air-cooled transformer is the main power equipment in power distribution system. Dry-type transformers need to be equipped with temperature protection according to regulations. The temperature protection control contact is opened from the temperature control box. [0003] The traditional transformer temperature control box only sets a temperature measurement RTD (RTD is a resistance temperature detector) at each temperature measurement point. When the temperature measurement RTD fails, it will cause false alarms or even false trips of the temperature control box. Although the traditional temperature control box itself has the function of checking the short circuit and...

AI Technical Summary

Problems solved by technology

[0004] (1) There is no corresponding detection and locking measure when the temperature measurement RTD fails, that is to say, after the temperature measurement RTD fails, it may cause the transformer to trip due to non-electricity protection malfunction;

[0005] (2) When the temperature measurement RTD fails (the false trip setting value is not reached), if the power failure is not handled in time, the phase transformer will lose its temperature protection, and the phase transformer will be in a working environment without temperature protection. exceptions will affect the

[0006] (2) If the power is cut off in time to deal with the failure of the temperature measuring RTD, the equipment must be shut down once, resulting in an unplanned shutdown of the equipment, which will cause economic losses

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