Control system and method for automatically controlling pressure of cooling water system
A technology of cooling water system and control method, applied in non-electric variable control, control/regulation system, simultaneous control of multiple variables, etc., can solve the problems of cooling system pressure drop, loss of work ability, gas leakage, etc., to prevent The effect of misjudgment and safety improvement
Inactive Publication Date: 2021-03-12
中广核(乌兰察布)风力发电有限公司 +1
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Problems solved by technology
[0002] At present, the water cooling system of the frequency converter is a closed cooling water system. Since the volume of water changes greatly at different temperatures and gas appears during the change process, there is a key component to maintain stable operation in the closed system-the pressure tank; in practice During the operation, due to the frequent leakage of the gas filled in the pressure storage tank, the outer wall of the water bladder is almost bonded to the inner wall of the pressure storage tank and loses the ability of the gas to do work on the water bladder, resulting in insufficient system pressure and water flow, frequently causing IGBT high temperature and water cooling pressure low failure
[0003] At present, the main maintenance methods on site are: 1. Supplementing the gas pressure in the surge tank, 2. Supplementing cooling water; maintaining the normal pressure of the system by supplementing gas and supplementing water, but any gas leakage will cause the pressure of the cooling system to drop and cause failure, can not solve the problem fundamentally
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[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0038] refer to figure 1 and figure 2 , is a control method for automatic control of cooling water system pressure disclosed by the present invention. This system monitors the water pressure in the cooling water system in real time, replenishes water at low pressure and releases pressure at high pressure, and maintains the pressure of cooling water in the system at all times. In the best range; the controller is small in size, convenient in wiring, good in stability, and has the following functions at the same time:
[0039] 1. Adopt pressure control, low pressure delay start, high pressure delay disconnection;
[0040] 2. With high pressure, low pressure, leakage alarm and overload protection functions;
[0041] 3. Low temperature -30℃~80℃ working range, with temperature protection function;
[0042] 4. With PLC heartbeat monitoring function and fault a...
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The invention relates to a control method for automatically controlling the pressure of a cooling water system, and the method comprises the steps: 1, judging whether each detection unit is in an execution state or not based on data feedback, and entering the next step if the detection units are in the execution state; 2, detecting an internal pressure value of the circulating system, and comparing a preset reference value to perform graded regulation and control, wherein after the alternating current contactor controls the make-up pump motor starting relay to act, the make-up pump is successfully started when the make-up pump is fed back, connected and continuously operated within a delay time set by a user and is not in a disconnected state, otherwise, comprehensive alarming is carried out, the detection unit and the grading regulation and control unit are integrated on the circuit board and are connected with a circulating water system main control computer through an I / O port so asto realize data interaction and control, and meanwhile, the invention discloses a control system for automatically controlling the pressure of the cooling water system, and the control system has theeffect of improving the safety of the circulating water system.
Description
technical field [0001] The invention relates to the technical field of frequency conversion control of cooling water, in particular to a control system and method for automatic pressure control of a cooling water system. Background technique [0002] At present, the water cooling system of the frequency converter is a closed cooling water system. Since the volume of water changes greatly at different temperatures and gas appears during the change process, there is a key component to maintain stable operation in the closed system-the pressure tank; in practice During the operation, due to the frequent leakage of the gas filled in the pressure storage tank, the outer wall of the water bladder is almost bonded to the inner wall of the pressure storage tank and loses the ability of the gas to do work on the water bladder, resulting in insufficient system pressure and water flow, frequently causing IGBT high temperature and water cooling pressure low failure. [0003] At present...
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IPC IPC(8): G05D27/02
CPCG05D27/02
Inventor 高瑞林王亚涛李亦伦李关平樊振海高煜坤
Owner 中广核(乌兰察布)风力发电有限公司