High-voltage cabinet dew point detection system and method thereof

Abstract

The invention relates to a high-voltage cabinet dew point detection system and a method thereof. The system comprises a remote computer, a main controller and a temperature and humidity transmitter used for acquiring indoor and outdoor temperature and humidity data changes of a high-voltage cabinet. The temperature and humidity transmitter sensitively detects temperature and humidity value changes in air, converts the changes into electric signals and transmits the electric signals to a system host, namely the main controller, through an RS-485 bus. The system host processes, converts, displays and stores data, compares the data with a set value and controls a warning unit and a dehumidifying corollary device to work. Besides, the main controller transmits the data and state content to the remote computer. Accordingly, temperature, humidity and dew point data in the 35 kV high-voltage cabinet can be directly detected. Prevention is conducted before equipment in the cabinet, especially a busbar, generates condensation. Meanwhile, the dehumidifying corollary device can be controlled to dehumidify the interior of the cabinet in a linkage mode, the dew point in the cabinet is lowered, work efficiency is improved, loads of operators are reduced, and the requirement of power industry development in China is also met.

Description

technical field [0001] The invention relates to the field of dew point detection of a high-voltage cabinet, in particular to a system and method for detecting the dew point of a 35kV high-voltage cabinet. Background technique [0002] At present, the mainstream detection method of dew point detectors on the market is to cool a mirror surface in the moist air of the sample until the moment when dew drops (or ice crystals) appear on the mirror surface, and measure the average temperature of the mirror surface, which is the dew (frost) point temperature. . It has high humidity measurement accuracy, but it needs a highly polished mirror surface, a high-precision temperature control system, and a highly sensitive dew drop (ice crystal) optical detection system. When using, the pipes that inhale the sample air must be kept clean, otherwise the impurities in the pipes will absorb or release moisture and cause measurement errors. The existing problems are "difficult online measurem...

AI Technical Summary

Problems solved by technology

When using, the pipes that inhale the sample air must be kept clean, otherwise the impurities in the pipes will absorb or release moisture and cause measurement errors. The existing problems are "difficult online measurement, expensive, cumbersome operation, complicated maintenance, and poor stability"

There are other methods such as electric sensor type and dielectric method, which have low measurement accuracy and poor stability. At the same time, the existing technology can only detect the dew point temperature, but there is no effective method for controlling the dew point temperature, so it cannot be applied to some special requirements for the dew point temperature. In some occasions, it greatly limits the expansion of its social and economic benefits and application fields.

[0003] At present, the dew point detection and control in the 35kV high-voltage cabinet is still blank, but it is very necessary. The dew point temperature in the high-voltage cabinet can intuitively reflect the condensation situation in the cabinet, and the detection and control of the dew point temperature can avoid condensation in the cabinet. The insulation strength of the equipment in the cabinet, especially the busbar, caused by the exposure is reduced, and then the surface flashover of the insulating part or the explosion of the switch occurs, which seriously affects its safe and stable operation.

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