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Low-voltage alternating current power supply programmable switching system of substation

A technology of AC power supply and switching system, applied in emergency power supply arrangement, electrical components, circuit devices, etc., can solve problems such as misoperation and refusal to operate, and achieve the effect of improving adaptability, ensuring continuous operation and low application cost

Inactive Publication Date: 2010-10-27
WUZHONG POWER SUPPLY COMPANY STATE GRID NINGXIA ELECTRIC POWER
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

When the relay contacts are stuck or the vibration intensity is high, it is more prone to malfunction, refusal and other reliability degradation phenomena

Method used

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  • Low-voltage alternating current power supply programmable switching system of substation
  • Low-voltage alternating current power supply programmable switching system of substation
  • Low-voltage alternating current power supply programmable switching system of substation

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with accompanying drawing:

[0015] Such as figure 1 As shown, the programmable controller adopts Omron-cpm1A-PLC, which completes the identification of the operation mode, the judgment of the action logic, and the output of the action logic.

[0016] Such as figure 2 As shown, the extended I / O circuit adopts a special anti-electromagnetic interference module and circuit, which makes the device have a strong anti-interference ability. It is completely separated from the weak current; if the switch is closed during detection, the +12V voltage is applied to terminals 1 and 2 of the optocoupler, and the corresponding terminals 3 and 4 of the optocoupler are turned on, which is detected by the P27 pin of the 8255I / O expansion chip. And then send it to PLC through 74533p latch chip to get the on and off information of corresponding switch, and vice versa.

[0017] Such as image 3 As shown, w...

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PUM

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Abstract

The invention relates to an electric intelligent programmable logic control device of a substation, in particular to a low-voltage alternating current power supply programmable switching system of a substation. The system is characterized by comprising a programmable controller, wherein the programmable controller is connected with all power supply incoming wires and buses by an alternating current acquiring loop so as to obtain the three-phase voltage and the bus voltage at the wire incoming side; the programmable controller is connected with a corresponding switch by an expanded I / O (Input / Output) circuit so as to obtain the position information of the switch; and the programmable controller is also connected with a power supply switch by an isolation drive amplifying circuit so as to control the on-off of the corresponding power supply switch. The invention is particularly suitable for an occasion in which two sets or multiple sets of low-voltage power supplies for N+1 frequently work in turn; when an accident happens, at least one path of power supply works; and after the accident is eliminated, the system automatically restores and runs in an original way, can efficiently and reliably ensure the continuous running of a power supply system without manual intervention completely and is particularly suitable for an unattended substation of 35-750kV.

Description

technical field [0001] The invention relates to an intelligent programmable logic control device for power consumption in substations, in particular to a programmable switching system for low-voltage AC power supplies in substations. Background technique [0002] In the 110kV unattended substation, the power used generally adopts two substation transformers running in parallel on the high voltage side, and one main and one backup working mode on the low voltage side. The switching of the main and standby depends entirely on the auxiliary contact of the working power switch used directly or through the delay relay to start the standby power input. This kind of main-standby switching circuit of the power supply used has relatively serious defects, which are mainly manifested in the following aspects: [0003] The operating conditions of the line where the station substation is located cannot be controlled by the receiving party. In a substation with an external station sub...

Claims

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Application Information

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IPC IPC(8): H02J9/06
Inventor 邓世杰王国军
Owner WUZHONG POWER SUPPLY COMPANY STATE GRID NINGXIA ELECTRIC POWER
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