CN-122001072-A - Load noninductive switching device based on dual-power-supply fast-switching switch and operation method thereof

CN122001072ACN 122001072 ACN122001072 ACN 122001072ACN-122001072-A

Abstract

The invention relates to the technical field of grid connection technology, and discloses a load noninductive switching device based on a dual-power-supply quick-switching switch and an operation method thereof, wherein the load noninductive switching device comprises a dual-switching switch, and the dual-switching switch is provided with a main power supply interface S1, a standby power supply interface S2 and a load output interface S3; the main power supply interface S1, the standby power supply interface S2 and the load output interface S3 are all low-voltage complete emergency interfaces; the double-cut switch is provided with three stations, namely a main station, a standby station and a branch station, wherein when the double-cut switch is the main station, the main power contact is communicated with the load output contact, when the double-cut switch is the standby station, the main power contact is communicated with the standby power contact, the double-cut switch is provided with a main and standby power self-checking function, when the power of the main power interface S1 is detected, the automatic switching-on is carried out to the main station, and when the power of the main power interface S1 is detected, the automatic switching-on is carried out to the standby station, and the invention has the advantages of simple control principle, reducing the installation and operation difficulty of operators and realizing that the low-voltage load is close to 0 power failure.

Inventors

CHEN ZHIXIN
HUANG CHAOYI
HUANG WEIDA
Xu Mojin
HUANG DEYU
ZOU WENCONG
CHEN SHAOLONG
ZHOU FULONG
CHEN YIWEI

Assignees

国网福建省电力有限公司泉州供电公司
国网福建省电力有限公司

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (10)

1. The load noninductive switching device based on the double-power-supply quick-switching switch is characterized by comprising a double-switching switch, wherein the double-switching switch is provided with a main power supply interface S1, a standby power supply interface S2 and a load output interface S3, and the main power supply interface S1, the standby power supply interface S2 and the load output interface S3 are low-voltage complete emergency interfaces; the double-switching switch is provided with three stations, namely a main station, a standby station and a branch station; When the double-switching switch is a main station, the main power contact is conducted with the load output contact so as to conduct the main power interface S1 with the load output interface S3; When the double-switching switch is a standby station, the main power contact is conducted with the standby power contact so as to conduct the main power interface S1 with the standby power interface S2; When the double-switching switch is a split station, the main power supply contact, the standby power supply contact and the load output contact are all non-conductive, so that the main power supply interface S1, the standby power supply interface S2 and the load output interface S2 are all non-conductive; The double-switching switch has a main power supply and standby power supply self-checking function, and is automatically switched on to a main station when the power supply of the main power supply interface S1 is detected, and is automatically switched on to a standby station when the power supply of the main power supply interface S1 is detected to be lost.
2. The load noninductive switching device based on the dual-power-supply fast-switching switch as set forth in claim 1, wherein the main power supply interface S1 in the dual-switching switch is connected to the main power supply contact by a protection switch, and the protection switch is a manual switch.
3. The load noninductive switching device based on the dual-power-supply fast-switching switch is characterized in that a low-voltage nuclear phase point P1 is led outwards between a main power supply contact and a protection switch in the dual-switching switch, a nuclear phase device is further integrated in the dual-switching switch, the nuclear phase device checks the phase sequence of the low-voltage nuclear phase point P1 and a main power supply interface S1, and the nuclear phase device gives an alarm when the phase sequence is inconsistent.
4. A method of operating a dual power fast switching based load-noninductive switching device as set forth in claim 3, comprising the steps of: According to different use scenes, wiring is carried out, the main power supply interface S1 of the load noninductive switching device is connected to a main power supply, the standby power supply interface S2 is connected to a standby power supply, the load output interface S3 is connected to a low-voltage load, and the low-voltage live working mode is adopted in the wiring process: Performing grid-connected operation; And (5) performing off-grid operation.
5. The method for operating a load-noninductive switching device based on a dual-power-supply fast-switching switch as set forth in claim 4, wherein when the usage scenario is an indoor transformer, the wiring method comprises: A wire inlet switch, a wire inlet knife switch I, an indoor transformer and a low-voltage switch 4001 are sequentially arranged between a main power supply and a low-voltage load, and a low-voltage cable is led out from a K1 point between the low-voltage switch 4001 and the transformer and is connected to a main power supply interface S1 of the load noninductive switching device; Connecting a standby power interface S2 of the load non-inductive switching device to a standby power supply; the load output interface S3 of the load-less switching device is connected to a low voltage load.
6. The method for operating a load noninductive switching device based on a dual-power-supply fast-switching switch as set forth in claim 5, wherein when the usage scene is an indoor transformer, the method for performing grid-connected operation comprises the following steps: Switching the double-switching switch to a main station; after checking that the phase sequences of the K1 point and the two ends of the load output interface S3 are consistent, a protection switch is closed; The low-voltage switch 4001 is disconnected, and the main power supply is communicated with a low-voltage load through the load non-inductive switching device; starting a standby power supply, and checking that the phase sequence of the standby power supply is consistent with that of a main power supply; The main power supply is disconnected, the power is lost at the point K1, and the double-switching switch automatically closes to the standby station after detecting that the main power supply interface S1 is lost, so that the switching between the main power supply and the standby power supply is realized; After the switching is completed, the protection switch is disconnected and a grounding wire on the side of the main power supply is arranged.
7. The method for operating a load-noninductive switching device based on a dual-power-supply fast-switching switch as set forth in claim 5, wherein when the usage scene is an indoor transformer, the method for performing off-grid operation comprises the following steps: closing a protection switch; Closing a wire inlet switch and a wire inlet knife switch I, powering on a point K1, and automatically switching on to a main station after the double-switching switch detects that a main power interface S1 is powered on; Checking that the amplitude phase angles of the voltages at two sides of the low-voltage switch 4001 are consistent, and closing the low-voltage switch 4001 after the differential pressure is 0; opening the protection switch; and (5) detaching the low-voltage cable.
8. The method of claim 4, wherein when the usage scenario is a pole-mounted transformer, the wiring method comprises the steps of: a wire inlet switch, a wire inlet disconnecting link II, a pole-mounted transformer, a low-voltage switch 4001, a low-voltage switch 4101 and a low-voltage switch 4102 which are connected in parallel are sequentially arranged between a main power supply and a low-voltage load, and a first lead-out voltage cable is connected to a main power supply interface S1 of the load noninductive switching device at a point K1 between the low-voltage switch 4001 and the parallel connection part of the low-voltage switch 4101 and the low-voltage switch 4102; Connecting a standby power interface S2 of the load non-inductive switching device to a standby power supply; and a second low-voltage cable is led out from a point K2 between the low-voltage switch 4101 and the low-voltage load and a point K3 between the low-voltage switch 4102 and the low-voltage load, and the second low-voltage cable is connected with the point K2 and the point K3 to a load output interface S3 of the load noninductive switching device.
9. The method for operating a load noninductive switching device based on a dual-power-supply fast-switching switch as set forth in claim 8, wherein when the usage scene is a column transformer, the method for performing grid-connected operation comprises the following steps: Switching the double-switching switch to a main station; after checking that the phase sequences of the K1 point and the two ends of the load output interface S3 are consistent, a protection switch is closed; opening the low-voltage switch 4101 and the low-voltage switch 4102, and communicating the main power supply with the low-voltage load through the load non-sensing switching device; starting a standby power supply, and checking that the phase sequence of the standby power supply is consistent with that of a main power supply; the low-voltage switch 4001 is disconnected, the point K1 is powered off, and the double-switching switch automatically switches on to the standby station after detecting that the main power interface S1 is powered off, so that the switching between the main power and the standby power is realized; After the switching is completed, the protection switch is disconnected and a grounding wire on the side of the main power supply is arranged.
10. The method for operating a load-free switching device based on a dual power fast switch as set forth in claim 8, wherein the off-grid operation comprises: closing a protection switch; The low-voltage switch 4001 is closed, the point K1 is powered on, and the double-switch automatically closes to a main station after detecting that the main power supply interface S1 is powered on; checking that the phase angles of the voltage amplitude values at two sides of the low-voltage switch 4101 are consistent, closing the low-voltage switch 4101 after the pressure difference is 0, checking that the phase angles of the voltage amplitude values at two sides of the low-voltage switch 4102 are consistent, and closing the low-voltage switch 4102 after the pressure difference is 0; opening the protection switch; And removing the first and second cables.

Description

Load noninductive switching device based on dual-power-supply fast-switching switch and operation method thereof Technical Field The invention relates to a load noninductive switching device based on a dual-power-supply fast-switching switch and an operation method thereof, and belongs to the technical field of grid connection technology. Background At present, due to extreme weather influences of typhoons, floods and the like in a certain area, the regional travel industry is continuously developed, and the power supply capacity and the power supply quality of the power industry face continuous challenges. The active power distribution network taking new energy as a main body is needed to be further improved in the aspects of power supply reliability and emergency power supply protection elasticity. In the domestic emergency electricity-keeping system, the mobile power generation vehicle plays an important role as a key means for a long time, but the inherent technical defects and the operation logic contradiction of the mobile power generation vehicle are gradually revealed. From the analysis of the technical mechanism and the system running level, the traditional power-saving of the power generation vehicle mainly has the following problems: because the technology is mature and the cost is low, the energy storage device serving as an emergency power supply task in the current power grid is generally a diesel power generation vehicle, but when the diesel power generation vehicle is connected with the power grid, certain frequency, voltage phase angle and voltage amplitude difference exist between the diesel power generation vehicle and the power grid, and the grid connection technology is lagged, so that certain waiting time is needed when the diesel power generation vehicle is connected with the power grid, and a breakpoint exists in power supply. In the prior art, the invention patent with the Chinese patent application number of CN202210283338.7 discloses a grid-connected electrical system, which utilizes the interconnection of an incoming cable, an outgoing cable, an incoming socket, an outgoing socket and a vehicle-mounted socket of a generator car under the cooperation of a low-voltage distribution network module, the generator car and a transfer box, and is matched with a quasi-synchronous grid-connected device, so that the problems that the conventional generator car cannot automatically complete the functions of parallel operation and grid-connected power generation due to the absence of the synchronous device, the adverse effect of short-time power failure when the old generator car is used for power protection are solved, and the requirement of the uninterrupted operation of the existing bypass is met. In the prior art, the invention patent application with the Chinese patent application number of CN202411138144.3 discloses a non-inductive conversion system, wherein a control unit determines required output voltage and phase angle of a generator set according to operation data and sends the required output voltage and phase angle of the generator set to a generator set controller, meanwhile, a switch unit is controlled to operate according to detection operation data and protect the generator set under abnormal conditions, the switch unit controls and switches an internal loop of the device according to the operation data, and cuts off a fault means of subsistence when the fault occurs, and the synchronous switching between the commercial power and the generator set is realized by the cooperation of each module and each unit. However, the technical scheme has the following problems in actual use: for a grid-connected electrical system, although the requirement of bypass uninterrupted operation can be emphasized, short-time power outage operation is still required in the process of actually connecting and disconnecting the cable of the power generation vehicle. Although the outage time has been significantly compressed, it may still cause problems such as poor user experience. For the non-inductive conversion system, various units such as a control unit, a detection unit and the like are additionally arranged and adaptive communication setting is carried out, and the control principle is complex, so that the operation difficulty of on-site staff in installation and operation is high. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a load noninductive switching device based on a dual-power-supply fast-switching switch and an operation method thereof. The technical scheme of the invention is as follows: The invention provides a load noninductive switching device based on a dual-power-supply quick-switching switch, which comprises a dual-switching switch, a load output interface S3 and a load control circuit, wherein the dual-switching switch is provided with a main power supply interface S1, a standby power supply interface S2 and a load output inter