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A Water Leakage Judgment Method for Water Cooling System

A water-cooling system and cooling water technology, which is applied in the direction of liquid tightness measurement using liquid/vacuum degree, etc., can solve the problems of system pressure and temperature, monitoring discontinuity, cooling water temperature changes, etc., to ensure continuity Effects on Sex and Accuracy

Active Publication Date: 2016-08-17
BEIJING GUODIAN FUTONG SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method of this scheme is to obtain the change of the liquid level, but the liquid level is affected by many factors, and it is also affected by the system pressure and temperature without considering the change of the liquid level caused by the leakage factor.
Judging water leakage only based on the liquid level may cause misjudgment or missed judgment, especially when the system starts and stops or the temperature changes greatly, and the temperature of the cooling water also changes greatly. In order to prevent misjudgment, it is necessary to stop water leakage judge
This creates discontinuity in monitoring and increases the risk of false negatives

Method used

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  • A Water Leakage Judgment Method for Water Cooling System
  • A Water Leakage Judgment Method for Water Cooling System
  • A Water Leakage Judgment Method for Water Cooling System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The converter valve is the core equipment of the high-voltage direct current transmission system. By sequentially connecting the three-phase alternating voltage to the direct current terminal, the desired direct current voltage is obtained and power control is realized. In order to discharge the heat generated during the working process of the converter valve in time and reduce the temperature of the converter valve, a cooling system needs to be installed. Such as figure 1 As shown, a schematic diagram of a diverter valve and its water-cooling system is given. The diverter valve 2 is surrounded by a water-cooling system, and the circulation pump 1 drives the cooling water of the entire water-cooling system to circulate to discharge heat. An inlet valve temperature sensor 6 is provided at the cooling water inlet valve, and an outlet valve temperature sensor 7 is installed at the outlet valve of the cooling water. Water dissipates heat. In addition, the water cooling sy...

Embodiment 2

[0091] In this embodiment, when establishing the corresponding relationship between the liquid level of the buffer tank and the temperature of each measuring point, a quadratic function is used to establish the relationship, and the relationship between temperature and liquid level is selected as:

[0092] It can be obtained by solving equations and curve fitting

[0093] The relational formula.

[0094] Method 1: Solving equation method.

[0095] There are a, b in this relationship 1 , b 2 、c 1 、c 2 There are five unknowns, so five sets of data need to be collected. By starting different numbers of heater groups and setting the speed of the radiator fan, five sets of data are actually obtained.

[0096] Solve the system of equations:

[0097]

[0098] Solve for a, b 1 , b 2 、c 1 、c 2 value. The relationship can be determined.

[0099] Method 2: Curve Fitting Method

[0100] Several sets of data can be collected for multiple sets of data:

[0101] Calculate...

Embodiment 3

[0118] In this embodiment, a neural network is used to establish the corresponding relationship between the liquid level of the buffer tank and the temperature of each measurement point, and the specific method is as follows:

[0119] First, the pressure in the buffer tank is kept stable by means of air supply or exhaust.

[0120] Then, the temperature change of the cooling water is controlled, and the temperature of each measurement point and the liquid level of the buffer tank are collected under different conditions. In the case of confirming that the system is not leaking, by changing the number of heating groups of the heater and the frequency of the cooling fan, different temperatures and corresponding liquid level values ​​are obtained, and these values ​​are used as input samples to train the neural network, here The neural network can use the neural network model in the prior art to obtain a suitable neural network model through the sample training method, thereby est...

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Abstract

The invention provides a water leakage determination method for a water cooling system, comprising steps of stabilizing pressure within a buffering tank, obtaining temperature values of a plurality of measurement points and liquid level heights of the buffering tank through controlling the change of the water temperature, calculating the reference liquid level value of the buffering tank according to the temperature obtained in real time of all measurement points and the correspondence relation between the liquid level heights of the buffering tank and all the measurement points in the process of cool water operation, comparing the real liquid level value of the buffering tank with the reference liquid level value and determining whether the water leakage exists according to the difference. The scheme provided by the invention gives full consideration to the impact on the liquid level caused by temperature change, and avoids the fact that in the prior art, the water leakage can only be determined according to the liquid level, and when the temperature change is big, the water leakage cannot be determined or can be mistakenly judged. The scheme of the invention overcomes interference of the buffering tank caused by temperature of the cooled water, realizes the constant monitoring for the water leakage of the water cooling system and effectively eliminates misreporting and falling to report.

Description

technical field [0001] The invention relates to a method for judging water leakage, in particular to a method for judging water leakage of a water cooling system of a converter valve. Background technique [0002] HVDC transmission is a commonly used power transmission method at present. The converter valve is the core equipment of the HVDC transmission system. By sequentially connecting the three-phase AC voltage to the DC terminal, the desired DC voltage is obtained and power control is realized. The normal operation of the converter valve is the basis for the stable operation of the HVDC transmission circuit. The diverter valve generates heat during operation. If the temperature is too high, it will affect the service life and accuracy of its internal components. Therefore, the cooling system of the diverter valve provides a guarantee for its stable and reliable operation. [0003] In order to ensure the normal operation of the converter valve, the cooling system of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/02
Inventor 张昕刚徐善军孔德卿刘振强张培林
Owner BEIJING GUODIAN FUTONG SCI & TECH DEV
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