CN216902504U

CN216902504U - Zero-crossing switching on-load synchronous capacity-regulating reactance-regulating switch for series multi-tap reactor

Info

Publication number: CN216902504U
Application number: CN202122928936.9U
Authority: CN
Inventors: 朱阳; 杨嘉懿; 王凡; 王化勇; 蒋喜贵; 杨威
Original assignee: Liaoning Tuoxin Electric Power Electronic Co ltd
Current assignee: Liaoning Tuoxin Electric Power Electronic Co ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-07-05
Anticipated expiration: 2031-11-26

Abstract

The utility model discloses a zero-crossing switching on-load synchronous capacity and reactance regulating switch of a series multi-tap reactor, which comprises the following components: the series multi-tap reactor is formed by combining a single-phase combination switch A, a single-phase combination switch B and a single-phase combination switch C; the single-phase combination switch A, the single-phase combination switch B and the single-phase combination switch C are respectively composed of a single-phase permanent magnet vacuum contactor I, a single-phase permanent magnet vacuum contactor II, a single-phase permanent magnet vacuum contactor III and a single-phase permanent magnet vacuum contactor four. According to the utility model, 3 independent single-phase unit switches are distinguished from 3-phase linkage switches, zero-crossing switching can be conveniently realized through software control, a control system samples the voltage of Uab in real time to identify a zero crossing point, the A-phase unit switches and the B-phase unit switches are controlled by a strategy at the time of Uab zero crossing, then the C-phase zero crossing point is found and then the C-phase unit switches are put into the capacitor bank, the voltage is put into the capacitor bank at the time of zero crossing, and inrush current impact when the capacitor bank is put into the capacitor bank is reduced.

Description

Zero-crossing switching on-load synchronous capacity-regulating reactance-regulating switch for series multi-tap reactor

Technical Field

The utility model relates to the technical field of power equipment, in particular to a zero-crossing switching on-load synchronous capacitance and reactance regulating switch of a series multi-tap reactor.

Background

At present, a capacitor and a multi-tap series reactor of an electric power system realize the switching of a reactive compensation capacitor bank through a switch of no-load synchronous impedance regulation, the maximum defect of the switching switch can not realize zero-crossing switching and on-load switching, namely, the switched capacitor bank is cut off firstly in the process of switching and switching, and then the gear is adjusted through the switch of no-load capacitance regulation and impedance regulation, and then a new gear capacitor bank can be put in, thus the switching time is long, the reactive under-compensation amount of a system is amplified in a short time of a power grid, even the voltage of the power grid is reduced in a short time, aiming at the defect, 4 single-phase permanent magnet vacuum contactors are used for each phase, the internal combination control is carried out to replace the original capacitance regulation and impedance regulation switch, the dynamic real-time compensation is realized, the switching time of the gear shifting is shortened, the load change is quickly followed, and the defect of the no-load capacitance regulation and impedance regulation of the original complete set product is improved, to achieve on-load synchronous capacitance and reactance adjustment, a zero-crossing switching on-load synchronous capacitance and reactance adjustment switch of a series multi-tap reactor is provided to solve the problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art and provides a zero-crossing switching on-load synchronous capacitance and reactance regulating switch of a series multi-tap reactor.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a reactor zero passage switching of tapping more establishes ties has synchronous transfer of holding to transfer reactance switch, includes reactor of tapping more establishes ties, still includes:

the series multi-tap reactor is formed by combining a single-phase combination switch A, a single-phase combination switch B and a single-phase combination switch C;

the single-phase combination switch A, the single-phase combination switch B and the single-phase combination switch C are respectively composed of a single-phase permanent magnet vacuum contactor I, a single-phase permanent magnet vacuum contactor II, a single-phase permanent magnet vacuum contactor III and a single-phase permanent magnet vacuum contactor four in combination.

Preferably, the single-phase combination switch a, the single-phase combination switch B and the single-phase combination switch C are respectively provided with a first outlet terminal, a second outlet terminal, a third outlet terminal, a fourth outlet terminal and a fifth outlet terminal.

Preferably, the first lead-out terminal, the second lead-out terminal and the third lead-out terminal are connection terminals of a series multi-tap reactor and are used for sequentially connecting reactors with capacities of 1/3, 2/3 and 3/3 of the whole group of capacities.

Preferably, the fourth outgoing terminal and the fifth outgoing terminal are connection terminals of the second group of capacitors, and are respectively used for connecting capacitor groups with capacities of the whole group of capacitors 1/3 and 2/3.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, 3 independent single-phase unit switches are distinguished from 3-phase linkage switches, zero-crossing switching can be conveniently realized through software control, a control system samples the voltage of a Uab in real time, the zero-crossing point is identified, the Uab zero-crossing time is controlled through a strategy to switch in the A-phase unit switch and the B-phase unit switch, then the C-phase zero-crossing point is found and then the C-phase unit switch is switched in, the voltage zero-crossing time is switched in a capacitor bank, and inrush current impact when the capacitor bank is switched in is reduced.

2. In the utility model, each phase unit switch is combined by a single-phase vacuum contactor, so that a capacitor bank can be switched on and off conveniently, good on-load continuous capacity and impedance adjusting performance is realized, the capacitor bank can be widely applied to a 10KV reactive power compensation device of a transformer substation, the precision of the reactive power compensation device of the transformer substation can be improved, and the economic operation of a power system is facilitated.

3. In the utility model, because a plurality of tapped reactors are selected to be connected with 2 groups of capacitors in series, 3-level switching is realized, compared with the traditional 3 groups of reactors connected with 3 groups of capacitors in series, the utility model has the advantages that the power distribution interval occupied by the reactive compensation device is saved, and the investment cost of the compensation device can be greatly reduced under the condition of the same capacity compensation.

Drawings

FIG. 1 is a schematic structural diagram of a multi-tap reactor of a zero-crossing switching on-load synchronous capacitance and reactance regulating switch of a series multi-tap reactor, which is provided by the utility model;

fig. 2 is a schematic diagram of a three-dimensional structure in a switching unit of a zero-crossing switching on-load synchronous capacitance and reactance regulating switch of a series multi-tap reactor provided by the utility model;

fig. 3 is a schematic diagram of a load zero-crossing switched capacitor bank of a series multi-tap reactor in the utility model.

FIG. 4 is a diagram of the internal connections of a group of switch units according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-4, the on-load zero-crossing switching synchronous capacitance and reactance regulating switch of the multi-tap reactor comprises a series multi-tap reactor and further comprises:

the single-phase combination switch A, the single-phase combination switch B and the single-phase combination switch C are respectively formed by combining a single-phase permanent magnet vacuum contactor I, a single-phase permanent magnet vacuum contactor II, a single-phase permanent magnet vacuum contactor III and a single-phase permanent magnet vacuum contactor IV, the single-phase combination switch A, the single-phase combination switch B and the single-phase combination switch C are respectively provided with a leading-out terminal I, a leading-out terminal II, a leading-out terminal III, a leading-out terminal IV and a leading-out terminal V, the leading-out terminal I, the leading-out terminal II and the leading-out terminal III are connecting ends of a series multi-tap reactor and are used for sequentially connecting reactors with capacity of 1/3, 2/3 and 3/3 of the whole group capacity, and the leading-out terminal IV and the leading-out terminal V are connecting ends of a second group of capacitors and are respectively used for connecting capacitor groups with capacity of the whole group capacity of 1/3 and 2/3;

the switch consists of 3 independent single-phase unit switches, and is marked as a single-phase combination switch A, a single-phase combination switch B and a single-phase combination switch C;

each single-phase unit switch consists of 4 single-phase vacuum contactors, and A-phase switches are respectively marked as A1#, A2#, A3#, and A4# vacuum contactors; the B-phase switches are respectively identified as a B1#, a B2#, a B3#, a B4# vacuum contactor; the C-phase switches are respectively identified as C1#, C2#, C3#, C4# vacuum contactors;

the contacts of 4 vacuum contactors of each single-phase unit switch are internally combined, 5 copper bar leading-out ends are led out, and the leading-out ends of the A-phase switches are marked as A _1, A _2, A _3, A _4 and A _ 5; b-phase switch leading-out terminals are marked as B _1, B _2, B _3, B _4 and B _ 5; c-phase switch leading-out terminals are marked as C _1, C _2, C _3, C _4 and C _ 5;

the 1, 2 and 3 leading-out ends of each phase unit switch are respectively connected with 3 leading-out ends of corresponding phases of the multi-tap reactors and are used for sequentially connecting reactors with capacities of 1/3, 2/3 and 3/3 of the whole group of capacities; the 4 ends are the connecting ends of the first group of capacitors, and the 5 ends are the connecting ends of the second group of capacitors, and the connecting ends are respectively used for connecting the capacitor groups with the capacity of the whole group of capacitors 1/3 and 2/3.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides a reactor zero passage switching on-load synchronous capacitance and reactance regulating switch that connects in series many taps, includes the reactor that connects in series many taps, its characterized in that still includes:

2. A series multi-tap reactor zero-crossing switching on-load synchronous capacitance and reactance regulating switch according to claim 1, characterized in that the single-phase combination switch A, the single-phase combination switch B and the single-phase combination switch C are respectively provided with a first leading-out end, a second leading-out end, a third leading-out end, a fourth leading-out end and a fifth leading-out end.

3. A series multi-tap reactor zero-crossing switching on-load synchronous capacitance and reactance regulating switch as claimed in claim 2, characterized in that the first lead-out terminal, the second lead-out terminal and the third lead-out terminal are connection terminals of a series multi-tap reactor and are used for sequentially connecting reactors with capacities of 1/3, 2/3 and 3/3 of the whole group of capacities.

4. A series multi-tap reactor zero-crossing switching on-load synchronous capacitance and reactance regulating switch as claimed in claim 2, characterized in that the four outgoing terminals and the five outgoing terminals are the connecting terminals of the second group of capacitors, and are respectively used for connecting the capacitor groups with the capacity of the whole group of capacitors 1/3 and 2/3.