Pressure-measuring-type heating controller for tank-type breaker and control method thereof

Abstract

The invention particularly relates to a pressure-measuring-type heating controller for a tank-type breaker and a control method thereof. The pressure-measuring-type heating controller comprises a controller body. The controller body is internally provided with a threshold value start / quit unit, a gas pressure alarm monitoring unit, a plurality of temperature sensing units, a memory storage unit, a comparison unit, a time delay unit, a detection unit and an output unit. The detection unit detects whether temperature sensors and heating bands have faults or not. The original control idea is changed, and the original temperature measuring-type control method is changed into the pressure measuring-type control method. The SF6 gas pressure alarm signal inside the breaker tank is taken as the device action signal while the ambient temperature is measured as the relative temperature and the time delay temperature comparison method is carried out, so as to solve the problem that the temperature control is prone to damage due to the frequent changes in the ambient temperature and long-term working of the temperature sensors. The controller is enabled to work reliably and accurately, the heating band group is switched on or off in the stacking mode, and the energy efficiency utilization of the whole heating device is improved. The whole heating device is enabled to work normally by installing a detection loop.

Description

technical field [0001] The invention relates to the technical field of electric equipment, in particular to a pressure-measuring heating controller and a control method for tank circuit breakers. Background technique [0002] At present, the existing tank circuit breaker heating device controller adopts the temperature measurement control method, that is, measures the temperature outside the circuit breaker tank, and when it is lower than the set value, starts the heating device to heat the circuit breaker tank to prevent Due to the temperature drop, the pressure of SF6 gas in the circuit breaker tank drops, causing the circuit breaker to lock and fail to work. [0003] For the controller designed according to this method, since the temperature sensor cannot be installed inside the tank circuit breaker, it can only be installed in the cable channel or the control cabinet, resulting in the inconsistency between the measured temperature and the actual temperature of the gas in...

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Problems solved by technology

[0002] At present, the existing tank circuit breaker heating device controller adopts the temperature measurement control method, that is, measures the temperature outside the circuit breaker tank, and when it is lower than the set value, starts the heating device to heat the circuit breaker tank to prevent Due to the temperature drop, the pressure of SF6 gas in the circuit breaker tank drops, causing the circuit breaker to lock and fail to work

[0003] The controller designed according to this method, because the temperature sensor cannot be installed inside the tank circuit breaker, it can only be installed in the cable channel or the control cabinet, resulting in inconsistent temperature measurement and the actual temperature of the gas in the tank

In order to avoid the phenomenon that the gas temperature in the tank is low and the temperature measurement temperature is set high, and the heating device does not start, the only thing to do is to adjust the set value of the temperature controller, resulting in low energy efficiency of the heating device.

[0004] Secondly, because the temperature sensor has been in working condition for a long time; and due to the bad outdoor working conditions, it is easy to cause damage and failure of the temperature sensor, which makes the circuit breaker heating device unable to be put into use. Manually switch the heating device, resulting in energy waste and inconvenient operation

[0005] Furthermore, when the ambient temperature is critical to the temperature setting value of the thermostat, or due to the large temperature difference between day and night, it is easy to cause frequent start and stop of the thermostat; or due to factors such as temperature drift of the electronic product itself, it is easy to cause temperature control The frequent start and stop of the thermostat will lead to failure and damage of the thermostat, and even damage to the entire heating control device, which cannot be started normally.

[0006] In addition, there is no detection unit in the original control loop, so the temperature sensor cannot be detected, whether the heating belt is intact

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