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Forced oil and forced air cooling control device of power transformers

A technology for power transformers and control devices, which is applied to emergency protection circuit devices, temperature control using electric methods, DC motor speed/torque control, etc. Acceleration shock, fan and oil pump motor failure and other problems, to improve the overall reliability, avoid full stop of air cooling, and protect the motor

Inactive Publication Date: 2003-07-23
深圳市普莱德电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding advantage of this traditional relay control device is that the cost of the control device is low, and the outstanding defects are that there are many contacts of the actuator, the damage rate of the AC contactor, the thermal relay, etc. are high, the reliability is poor, the maintenance is large, and the unit frequently invests / Exiting the cycle makes the oil pump and fan frequently suffer from current impact (starting current can be up to 10 times the working current) and mechanical acceleration impact, which may easily cause motor failure of the fan and oil pump

Method used

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  • Forced oil and forced air cooling control device of power transformers
  • Forced oil and forced air cooling control device of power transformers

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Embodiment Construction

[0009] As shown in the figure, the present invention includes multiple groups of coolers made up of fan FM and oil pump BM, and the inlet end of each group of coolers is connected with a frequency conversion governor BPQ controlled by a single-chip PLC; in the fan FM, The inlet ends of the oil pump BM are respectively connected in series with overcurrent protectors GL, and the signal output terminals of the overcurrent protectors GL are connected to the signal input interfaces of the single-chip microcomputer PLC. A power switch QH controlled by the single-chip PLC is arranged at the incoming line end of the frequency conversion speed regulator BPQ; a working status indicator ZIQ and an alarm BJQ are connected to the output interface of the single-chip PLC.

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Abstract

The control device includes the multiple coolers composed of the blower fan FM, the oil pump BM. The incoming line end of each cooler set is connected to the speed regulator controlled by the single chip PLC. The over current protector GL is connected to the incoming line end of the blower fan FM and the oil pump BM. The signal output end of the said over current protector GL is connected to the signal input end of the single chip PLC. The characters of the said structure make the pump motor and the fan motor possible to be regulated in step less speed mode as the temp change of the transformer. Thus, the cooling capacity can be adjusted quickly so as to keep the temp change of the transformer within a small range. The frequency Start / Stop of the pump motor and the fan motor is avoided soas to protect the motors and prolong the service life of the motors.

Description

Technical field: [0001] The invention relates to a cooling control device for a power transformer, in particular to a strong oil air cooling control device for a power transformer. Background technique: [0002] Existing strong oil air cooling control devices for power transformers all adopt the auxiliary start-stop type. The working principle, logic circuit, and selection of main components of the control device are roughly similar, with little difference. Its main components adopt conventional electromagnetic AC and DC relays, conventional thermal relays, etc., and the oil pump for forced oil circulation and the fan for strong wind cooling are divided into three states according to the group: operation, auxiliary and standby. When it is high, the auxiliary unit is added to start, and the standby unit is started when the operating unit or the auxiliary unit fails; two independent AC main power supplies are used as backup for each other. The outstanding advantage of this t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/19H02H7/08H02P1/30H02P1/54
Inventor 张华平
Owner 深圳市普莱德电气有限公司
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