Comprehensive monitoring and early warning device and early warning method for equipment temperature in wind power plant box-type transformer substation bin

Abstract

The invention discloses a comprehensive monitoring and early warning device and early warning method for equipment temperature in a wind power plant box-type transformer substation bin. The device comprises a wireless temperature monitoring unit, a wired temperature monitoring unit, a humidity monitoring unit, a transformer oil temperature measurement unit, a shell temperature measurement unit, anenvironment temperature detection unit, an operation current and voltage monitoring unit and a CPU operation control alarm unit which are arranged at different points of equipment in the box-type substation bin. The comprehensive temperature estimation calculation and three-level early warning judgment method considers the historical temperature, current real-time temperature, temperature changerate, equipment environment temperature, humidity and operation current of each operation equipment. According to the historical temperature value, the real-time sampling value and the temperature change rate of a certain measuring point, rapid temperature prediction and estimation are carried out; then comprehensive temperature calculation is carried out according to the influence of the environment temperature, humidity and load current; and finally, a three-level early warning judgment formula is formed based on mutual constraint of the calculated value and a time constant value, real-timeprediction and estimation comprehensive calculation and alarming are conducted on different temperature monitoring points of the equipment, and meanwhile corresponding judgment and early warning are conducted on humidity exceeding the standard and excess current.

Description

technical field [0001] The invention relates to the technical field of wind farm temperature early warning, in particular to a comprehensive monitoring and early warning device and early warning method for equipment temperature in a box-storage warehouse of a wind farm with reasonable structure and timely early warning. Background technique [0002] The wind farm box-transformer generally includes high-voltage load switches, isolating switches, transformers, low-voltage circuit breakers, transformers and main auxiliary devices. The traditional monitoring of the contact temperature of each device is often based on the current real-time monitoring value for early warning, without considering the equipment The historical temperature accumulation, temperature change rate, humidity, surrounding environment and operating current, etc., often miss the best forecast time, resulting in forecast lag or forecast jitter or forecast value reduction, so that the equipment cannot run at ful...

AI Technical Summary

Problems solved by technology

[0002] The wind farm box-transformer generally includes high-voltage load switches, isolating switches, transformers, low-voltage circuit breakers, transformers and main auxiliary devices. The traditional monitoring of the contact temperature of each device is often based on the current real-time monitoring value for early warning, without considering the equipment The historical temperature accumulation, temperature change rate, humidity, surrounding environment and operating current, etc., often miss the best forecast time, resulting in forecast lag or forecast jitter or forecast value reduction, so that the equipment cannot run at full power and efficiency. Considering the hysteresis forecast of the temperature change trend, the temperature may have accumulated at the time of the forecast, and the rapid increase may cause more serious fire accidents. For example, when the ambient temperature is high and the load current is large, the allowable contact temperature should be appropriately reduced. When the ambient temperature is low, such as winter, and the load current is small, the duration of the allowable temperature can be appropriately lengthened, etc.

Images