An energy-saving transformer cooler control cabinet and its control method

Abstract

The invention relates to an energy-saving type transformer cooler control cabinet and a control method thereof. The energy-saving type transformer cooler control cabinet and the control method thereof have the advantages of reasonable structure, high control precision, high flexibility, energy-saving performance and high efficiency. The control method includes the following steps that: step 1, the number of coolers that should be put into operation at the current moment is calculated; step 2, the number of the coolers that should be put into operation at the current moment is compared with the number of coolers have been put into operation currently, and if the number of the coolers that have been put into operation currently exceeds the number of the coolers that should be put into operation at the current moment, step 3 is executed, if the number of the coolers that have been put into operation currently is smaller than the number of the coolers that should be put into operation at the current moment, step 4 is executed, and if the number of the coolers that have been put into operation currently is equal to the number of the coolers that should be put into operation at the current moment, step 1 is executed; step 3, the coolers that have been put into operation currently are sequenced according to the accumulative running time of the coolers that have been put into operation currently, and the coolers that have been put into operation currently quit operation quit according to the long-to-short order of the time until the number of the coolers that have been put into operation currently is equal to the number of the coolers that should be put into operation at the current moment; and step 4, coolers that are not put into operation at the current moment are sequenced according to the accumulative running time of the coolers that are not put into operation at the current moment, the coolers that are not put into operation at the current moment are put into operation according to the short-to-long order of the time until the number of the coolers that have been put into operation currently is equal to the number of the coolers that should be put into operation at the current moment or all the coolers that are not put into operation at the current moment are all put into operation. The control cabinet includes a human-machine interaction module, a programmable control module, a detection unit, an output control bus and a number of coolers.

Description

technical field [0001] The invention relates to automatic control of a power transformer cooler, in particular to an energy-saving transformer cooler control cabinet and a control method thereof. Background technique [0002] The power transformer is one of the main equipment in the power system. Its main functions are voltage conversion and current transmission. The no-load loss, load loss and ambient temperature will all affect the temperature of the transformer cooling oil. The greater the change in the transformer load, the greater the loss. The greater the temperature change, the longer it affects the long-term stable operation and service life of the transformer. The traditional transformer cooling system adopts the relay control mode to drive the AC through the opening and closing of the limited mechanical contacts of the temperature controller (oil layer surface, winding temperature gauge). The coil of the contactor is connected to the working circuit of the cooler, ...

AI Technical Summary

Problems solved by technology

If any group in the "working" or "auxiliary" state fails during operation, the "standby" cooler is put into operation, and the fault is repaired, and the "standby" state cooler is out of operation; just keep the oil temperature at 45 degrees -55 degrees, load When the temperature is less than 80%, after the cooler in the working group is put into operation, the initial frequency of the given frequency converter is 30Hz, that is, the frequency is 30Hz when the oil temperature is 45 degrees, and when the temperature increases by 1°C, the frequency is also corresponding Increase, when the temperature reaches 55 degrees, the frequency is increased to 50Hz, and the frequency of the auxiliary cooler group is also converted in the same way, so the effect of frequency conversion is not obvious, and it is restricted by three working modes. If there are 6 groups of coolers, the distribution For example, 2 groups are "working group", 2 groups are "auxiliary group", and 2 groups are "standby group", when the oil temperature exceeds 55 degrees, there are two groups of coolers to start, which causes a kind of waste 1, such as If any group in the "working" or "auxiliary" state fails during operation, and the "standby" cooler is put into operation, there will be two sets of coolers put into operation, withdrawing from one group, and putting in 2 groups is another waste

Therefore, the control logic and frequency conversion adjustment method used in the control of the current inverter control cabinet or energy-saving air-cooled control cabinet has poor energy-saving effect and poor flexibility.

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