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Silicon rectifier power supply automatic switching device and silicon rectifier power supply automatic switching method based on the device

A silicon rectifier and power supply technology, which is applied in the field of silicon rectifier power supply self-injection, can solve the problems of protection, signal device and control circuit power failure, operators cannot arrive in time, protection device power failure, etc., to eliminate the bottleneck of safe and stable operation , Simple installation and operation, and the effect of preventing power system failure

Inactive Publication Date: 2016-01-20
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause all protection, signaling devices and control circuits in the station to lose power.
Make the 10kV line, busbar and main transformer protection device fail, which is absolutely not allowed in the regulations and is a serious defect
[0004] 2. In the process of restoring power transmission to the 66kV system or the faulty line, the DC power supply cannot be automatically switched on
The 66kV Cuigang Substation resumed operation with power on, but no one manually restored the DC power supply in time, resulting in the station being in a state of no DC power supply and the protection device losing power
Especially when line faults occur frequently at night and in bad weather, and the dispatcher changes the operation mode many times, the operating personnel cannot arrive at the scene in time, and sometimes they need to go back and forth several times in order to restore the DC power supply, which not only brings unsafe factors to traffic, but also increases colleagues. Cost of production

Method used

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  • Silicon rectifier power supply automatic switching device and silicon rectifier power supply automatic switching method based on the device
  • Silicon rectifier power supply automatic switching device and silicon rectifier power supply automatic switching method based on the device

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Experimental program
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specific Embodiment approach 1

[0016] Specific implementation mode 1. Combination figure 2 This specific embodiment will be described. A silicon rectifier power supply self-switching device described in this specific embodiment includes a three-phase AC contactor KM and a fuse FU, and the three-phase AC contactor KM is used to turn on or off the silicon rectifier. Power supply, fuse FU is used to switch and protect the control circuit of the AC contactor.

[0017] In this embodiment, a 380V three-phase AC contactor is used. When the low-voltage side outputs AC 400V power after the transformer used in the substation is charged, the AC contactor control circuit is connected, the coil excitation is pulled in, and the self-maintaining main contact is connected through the fuse FU. After the power supply of the silicon rectifier is turned on, the DC power supply is output to supply power to all relay protection and safety automatic devices in the substation. When the DC system or silicon rectifier fails, remov...

specific Embodiment approach 2

[0018] Specific embodiment 2. Combination figure 2 This specific embodiment is described. The difference between this specific embodiment and the silicon rectifier power supply self-switching device described in the first embodiment is that it also includes a power voltage regulator, a multi-function voltage digital display meter, a button, a manual automatic conversion device Switch, HR running light and HR stop light, the power regulator and the multi-function voltage digital display meter are connected in series in the main power circuit to detect the voltage in the main power circuit, buttons, manual automatic transfer switch, HR operation The light and HR stop light are set in the control loop, the button is used to turn on or off the control loop, the manual and automatic transfer switch is used to adjust the silicon rectifier power to be manually put in or automatically put in, the HR running light and the HR stop light are respectively connected to the control loop. T...

specific Embodiment approach 3

[0020] Specific embodiment three, the silicon rectifier power supply self-switching method based on the silicon rectifier power supply self-switching device described in the specific embodiment one is realized in the following ways:

[0021] When the low-voltage side outputs AC voltage after the transformer used in the substation is electrified, the AC contactor control circuit is connected, the coil excitation is closed, and the DC power is output after the silicon rectifier power supply is connected to the self-maintaining main contact of the fuse FU;

[0022] When the DC system or silicon rectifier fails, remove the fuse FU, cut off the control circuit of the AC contactor, and release the main contact of the coil demagnetization to disconnect the power supply of the silicon rectifier;

[0023] When the power system fails, the transformer used in the substation loses power, the AC power disappears, the contactor coil loses its magnetism, and the main contact is released to di...

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PUM

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Abstract

A silicon rectifier power supply automatic switching device and a silicon rectifier power supply automatic switching method based on the device relate to the silicon rectifier power supply automatic switching field. By using the device and the method, a problem existing in investment and maintenance of a 66kV conventional transformer substation to a silicon rectification power supply is solved. In the device, a three-phase alternating current contactor KM is used for connecting or disconnecting the silicon rectification power supply and a fuse FU is used for switching and protecting a control loop of the alternating current contactor. When a low voltage side after power transformation and electrification used in a transformer substation outputs an alternating voltage, the control loop is connected and a coil carries out excitation actuation so as to output a direct current power supply. When a direct current system or a silicon rectifier has a fault, the fuse FU is taken down, the control loop is cut off, the coil is in a loss of excitation state, a main contact is released and the rectification power supply is disconnected. When an electric power system has a fault, power transformation and power losing are realized, the alternating current power supply disappears, a contactor coil is in a loss of excitation state, the main contact is released and the silicon rectifier power supply is disconnected. When a variable alternating current power supply becomes normal, the contactor coil carries out automatic excitation suction and is connected to the rectifier power supply so as to realize automatic switching of the rectifier power supply.

Description

technical field [0001] The invention relates to the field of silicon rectifier power supply self-switching. Background technique [0002] It is currently in the 66kV power grid system of the Daxinganling Power Supply Company. Silicon rectifier DC power supply is widely used in 66kV conventional substations (substations that have not been technically transformed), without battery packs. According to statistics, they are 66kV Cuigang Substation, Bizhou Substation, Dawusu Substation, Tayuan Substation, Huyuan Substation, Bishui Substation, Changying Substation, Yuying Substation, Tuqiang Substation, and Amur Substation. They are distributed on the 66kV Tacui Line, 66kV Tahu Line, 66kV Jiasong Line, and 66kV Mo'a Line. The safe and stable operation of the above stations directly affects the safe and stable operation of the entire Daxinganling 66kV power system. The working principle of this DC power supply is: the 380V three-phase AC power output from the low-voltage side of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
Inventor 张仁申建张金鹏闫玉丽张成王野藤王学军刘晓磊
Owner STATE GRID CORP OF CHINA