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Method for implementing automatic switching of ring main unit standby power by FTU

A backup power supply and automatic switching technology, which is applied in emergency power supply arrangements, electrical components, circuit devices, etc., can solve the problems of unsatisfactory power backup automatic switching device solutions, and achieve the purpose of shortening the time of failure and power outage, reliable operation and cost saving. Effect

Inactive Publication Date: 2008-04-02
PENGLAI POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ①. The working power supply of the special backup self-injection device on the market is designed according to 220V, while the ring main unit only has a DC 24V power supply. In order to make the device operate reliably, an uninterrupted working power supply must be installed, so a dedicated backup self-injection device must be used. A UPS power system must be installed;
[0006] Therefore, it is not ideal to adopt a special power supply automatic switching device solution

Method used

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  • Method for implementing automatic switching of ring main unit standby power by FTU
  • Method for implementing automatic switching of ring main unit standby power by FTU

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Experimental program
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Embodiment 1

[0033] Embodiment 1, a method of utilizing FTU to realize the automatic switching of the backup power supply of the ring main unit, with reference to Fig. 4, & represents logic and among the figure, this method is to set the minimum setting value of the electric current of the controlled circuit at first, voltage, in QF 1 run QF 2 In standby mode, in this embodiment, first set QF 1 The minimum current I of the line zd =0.001A, minimum voltage U QF1 30V, when the FTU detects the QF 1 The current of the controlled line drops to the set value, the voltage drops to the set value, the backup line voltage is within the qualified range and QF 1 The switch is in the closed state, QF 2 In the opening state, that is, I QF1 zd , U V1 ≤30V, U V2 >90V, TWJ QF2 =1, HWJ QF1 = 1, where I QF1 for QF 1 Line current, U V1 is the QF1 line voltage, U V2 is the QF2 line voltage, I zd The current limit value for the system to judge the fault of the running power line, TWJ QF2 =1 mean...

Embodiment 2

[0034] Embodiment 2, a method of using FTU to realize the automatic switching of the backup power supply of the ring main unit,

[0035] Referring to Figure 5, & in the figure represents logical AND, the method is to first set the minimum set value of the current and voltage of the controlled circuit, and in QF 2 run QF 1 In standby mode, in this embodiment, first set QF 2 The minimum current I of the line zd =0.01A, minimum voltage U QF2 30V, when the FTU detects the QF 2 The current of the controlled line drops to the set value, the voltage drops to the set value, the backup line voltage is within the qualified range and QF 2 The switch is in the closed state, QF 1 In the opening state, that is, I QF2 zd , U V2 ≤30V, U V1 >90V, TWJ QF1 =1, HWJ QF2 = 1, where I QF2 is the current of QF2 line, U V1 is the QF1 line voltage, U V2 is the QF2 line voltage, I zd The current limit value for the system to judge the fault of the running power line, TWJ QF1 =1 means QF1 ...

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Abstract

The invention discloses a method of using a FTU to achieve an automatic switching of a ring main unit standby power supply, and is provided with the FTU function to achieve the function of automatic switching of the ring main unit standby power supply based on the prior FTU and ring main unit, wherein, a minimum limitative value of current and voltage of a controlled circuit is firstly set; the FTU detects current and voltage of an operating power line and voltage of a standby power supply, a switch position of the operating power line and a switch position of the standby power supply; a logic judgment is made according to a detection result and an action instruction is sent out, when the detection result is lower than a preset value and a standby line is in a breaking status, a fault line delay tripping command is sent out, so the fault line is separated from a ring network, meanwhile, a standby line closing command is sent out, and the standby line is started to enter the ring network; otherwise, the detection is continued. The invention has the advantages that the intelligent FTU is used to achieve the automatic switching of the ring main unit standby power supply, failure probability is reduced, action reliability is improved, failure outage time is shortened, workload and information of a master station is reduced, work of a tele-control master station can be more reliable, hardware need not be changed, and cost is low.

Description

1. Technical field [0001] The invention belongs to the technical field of power grid control, and in particular relates to a method for realizing automatic switching of a backup power supply of a ring network cabinet by using an FTU. 2. Background technology [0002] In the distribution network automation system, the ring network cabinet brings together more than two power sources to realize the switching of multiple power sources, the isolation of faults and the reconstruction of the network. The most common wiring method of the ring main unit, taking two-way power supply and two-way load as an example, as shown in Figure 1, QF1 and QF2 are the load switches of the two-way power supply, which play the role of power conversion, and QF3 and QF4 are the outgoing line breakers of the ring main unit device to realize the control and protection of branch lines. The operation modes of QF1, QF2, QF3, and QF4 include local manual operation, remote operation by dispatchers and autom...

Claims

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Application Information

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IPC IPC(8): H02J9/06
Inventor 沙声强战生韩兴勇崔金路吕洪军王应著
Owner PENGLAI POWER