Main pump switching device, main pump switching method and main pump system of high-voltage direct-current valve cooling system

A high-voltage direct current and switching device technology, applied in pump control, liquid variable capacity machinery, machine/engine, etc., can solve problems such as abnormal sound, reduced DC reliability, and faults, so as to improve reliability and eliminate hidden troubles Effect

Inactive Publication Date: 2013-04-24
CSG EHV POWER TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is prone to DC blocking, which reduces the reliability of DC
[0005] The main pump is a high-speed rotating device (3000 rpm), which is easy to wear and cause failure
Even if the maintenance is strengthened, failures will inevitably occur during the operation process, and abnormalities are common
Especially the sound is abnormal, there is no problem with short-term operation, but it is not suitable for long-term operation
In the case that DC cannot be powered off for maintenance, switching the main pump is the best choice, but at present, the main pump can only be switched manually and fixed on one main pump, which is prone to DC blocking, which reduces the reliability of DC

Method used

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  • Main pump switching device, main pump switching method and main pump system of high-voltage direct-current valve cooling system
  • Main pump switching device, main pump switching method and main pump system of high-voltage direct-current valve cooling system
  • Main pump switching device, main pump switching method and main pump system of high-voltage direct-current valve cooling system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-voltage DC valve cooling system switching device, such as figure 1 As shown, it includes a signal generating module 2, a control switch 1, a controller 3 and a counter 4;

[0028] The signal generation module 2 can generate a rising edge signal under the control of the control switch 1; the control switch 1 can be a switch button, or it can be another high-voltage direct current switch, and the signal generation module 2 is controlled to generate a rising edge by closing the switch signal; the controller 3 converts the rising edge signal into a pulse signal, and the width of the pulse signal is a scan cycle of the controller 3, so that the pulse signal is only executed once, and the pulse signal is sent to the counter 4; The counter 4 resets according to the pulse signal, and at the same time controls switching between the first main pump 5 and the second main pump 6 and counts.

[0029] According to the different calculation methods of the rising edge signal by...

Embodiment 2

[0035] Such as figure 2 As shown, a preferred scheme of the main pump switching device of a high-pressure DC valve cooling system in the present invention, this scheme is based on the technical scheme of Embodiment 1, and an anti-jamming module 7 is added after the controller. The anti-jamming module can set a time threshold of the pulse signal, and when the duration of the pulse signal is not less than the time threshold, send the pulse signal to the counter; otherwise, shield the pulse signal.

[0036] Due to electromagnetic interference or other reasons, unexpected positive pulses are generated on the input circuit of the switching button, and the main pump will be switched by mistake, and the control of the main pump will be chaotic. If there are multiple interferences, it will cause frequent switching of the main pump, damage the main pump, and cause the main water pressure to be low, causing the high-voltage direct current transmission system to stop operating, and even...

Embodiment 3

[0038] Such as image 3 As shown, it is another preferred embodiment of the switching device for the main pump of the high-pressure DC valve cooling system of the present invention. It is to add the anti-shake module 8 on the basis of embodiment 1 or embodiment 2. The anti-shake module 8 can be added on the basis of Embodiment 1 to improve the anti-shake function of the device, and can also be added on the basis of Embodiment 2. image 3 It is an optimal solution formed after adding on the basis of Example 2.

[0039] When the switch button is pressed, there will be vibration, which may be caused by the switch button itself, or it may be caused by the shaking of the operator's fingers. When the switch button vibrates, the controller 3 may get two rising edge signals or even more rising edge signals in a short period of time. Then it will cause the main pump to switch multiple times in a short period of time. Frequent starting will damage the main pump, and will also cause t...

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Abstract

The invention discloses a main pump switching device of a high-voltage direct-current valve cooling system. The main pump switching device comprises a signal generation module, a control switch, a controller and a counter, the signal generation module generates a rising edge signal, the controller converts the rising edge signal to a pulse signal and sends the pulse signal to the counter, and the counter resets according to the pulses signal, simultaneously controls switching between a first main pump and a second main pump and counts. The invention further discloses a main pump system and a main pump switching method of the high-voltage direct-current valve cooling system. By the technical scheme, under the circumstance that the high-voltage direct-current system is not powered off for overhauling, the designated main pump can be overhauled and maintained to eliminate fault hidden danger, the overhauled and maintained main pump can run according to an automatic running mode to turn into redundancy of the running main pump, and accordingly reliability of a direct-current power transmission system is improved.

Description

technical field [0001] The invention relates to a valve cooling system of a high-voltage direct current transmission system, in particular to a main pump switching device and method of the high-voltage direct current valve cooling system and a main pump system of the high-voltage direct current valve cooling system. Background technique [0002] The HVDC valve cooling system is the most important auxiliary system in the HVDC transmission project. At present, the converter adopts the water cooling mode, and its normal operation is a necessary condition to ensure the reliable operation of the converter valve. The importance of the fact that the device will burn out quickly and have a great impact on production is obvious. The main pump is the most important thing. The main pump is the power source of the high-voltage DC valve cooling system. If it fails, it will cause the high-voltage direct current transmission system to stop operating. At present, in order to solve the probl...

Claims

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Application Information

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IPC IPC(8): F04B49/06
Inventor 梁家豪左干清谢超汲广梁秉岗郭卫明罗炜董跃周马博
Owner CSG EHV POWER TRANSMISSION
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