CN2914444Y

CN2914444Y - Voltage regulating type low-voltage wattless compensator device

Info

Publication number: CN2914444Y
Application number: CNU2006201174162U
Authority: CN
Inventors: 李乾伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-06-04
Filing date: 2006-06-04
Publication date: 2007-06-20
Anticipated expiration: 2016-06-04

Abstract

A voltage-adjusting low-voltage reactive compensator comprises an automatic reactive compensation control device (2), a compensation capacitor C1, a filtering and current limiting reactor L1, a low-voltage bus of the apparatus to be compensated, a variac T3 and an automatic voltage adjusting device S3 for adjusting voltage in cooperation with each other, and an isolating switch S1 connected with a branch of the low-voltage bus and with T3 at both ends thereof, wherein the extraction line of each voltage adjusting level of T3 is connected with corresponding tapping position of S3; the common point of S3 serves as voltage adjusting output terminal connected with C1 and L1; an transformer T1 is connected with the low-voltage bus, and the output terminal of T1 is connected with the signal output port of the reactive compensation control device (2); and the low-voltage bus and the voltage sampling line of C1 are connected with the reactive compensation control device (2). The utility model can be used in low-voltage grid for reactive power compensation, and has the advantages of no shock to grid by the voltage adjusting process, low investment, low loss, long service life and high tracking speed.

Description

Pressure-adjusting type low-pressure reactive compensation device

Technical field

The utility model relates to a kind of low-voltage power system reactive power compensation device, is suitable for using in low voltage electric network.

Background technology

At present in the reactive-load compensation equipment of various countries' low-voltage power system, adopt the capacitor grouping switching mostly, have the contactor switching, also thuristor throw-in and throw-off arranged, though it is fast that these equipment have response speed, can realize the characteristics of dynamic real-time compensation, but its equipment complexity, investment is big, difficult in maintenance, the expense height.CN002360268 discloses Mr.'s He Ping the patented technology of " a grade pressure-adjusting type high pressure dynamic reactive compensation device is arranged ", this technology is the requirement that meets high-voltage electric power system, adopt the high pressure vacuum on load tap changer, also adopted load voltage to detect instrument transformer, equipment investment is also bigger than normal.

Summary of the invention

At the prior art above shortcomings, the purpose of this utility model provides a kind of pressure-adjusting type low-pressure reactive compensation device that be suitable for using, that tracking velocity is fast, the life-span is long, equipment investment is little, maintenance cost is low, that can realize the dynamic real-time compensation in low voltage electric network.

The utility model can be realized by following measure:

It includes reactive compensation automatic control device 2; compensation condenser C1; filtering current limiting reactor L1; by the low-voltage bus bar of compensation equipment; select for use the automatic pressure regulating device S3 of variac T3 and assembling voluntarily to cooperate; a separated time of isolating switch S1 one termination low-voltage bus bar in the circuit; another termination variac T3; each pressure regulation level lead-out wire of variac T3 connects with the corresponding tap position of automatic pressure regulating device S3 respectively; the common point of automatic pressure regulating device S3 is the pressure regulation output; this output termination filtering current limiting reactor L1; on low-voltage bus bar, be connected to load current and detect instrument transformer T1; load current detects the signal input port of the output termination low-pressure reactive compensation automatic control equipment of instrument transformer T1; the action of automatic pressure regulating device S3 is controlled by low-voltage reactive compensator capable; the voltage sample line of the voltage of low-voltage bus bar and building-out capacitor C1 inserts the low-pressure reactive compensation automatic control equipment simultaneously, in order to data analysis; calculate; the usefulness of protection.

The utility model also can be perfect by following measure: current detecting instrument transformer T2 is arranged between automatic pressure regulating device S3 and the compensation condenser C1, and compensation condenser C1 has been connected to the filtering current limiting reactor L1 of weakening effect; Automatic pressure regulating device S3 adopt have a big current switching capacity and have a multiple contact switch that switches transition resistance; The current switching capacity of this multiple contact switch is 30-200A; Its electromagnetic capacity of variac T3 is 0.2-0.5 a times of maximum compensation capacity, and pressure regulation progression is the 8-16 level.

What the utility model adopted variac and automatic pressure regulating device cooperates to come pressure regulation, make each pressure regulation tap steric hindrance of transformer anti-very low, induction reactance and capacitive reactance ratio are constant in the pressure regulation process, make dynamic compensating device still have effect with the high order harmonic component of static compensating device filtering as much, thereby when existing system transformed, can make full use of former building-out capacitor and filter reactance.Utilize automatic pressure regulating device S3 to finish and switch the characteristics that transition does not have breakpoint, solved the shock problem that the electric capacity off-grid causes in the pressure regulation process by resistance; Adopt capacitor C1 to carry out reactive power compensation, economical and practical, especially adopt variac T3 to come the pressure regulation transformation, can reduce cost, reduce loss significantly, compare with the automatic compensation equipment of direct grouping switching, life-span, compensation effect and reliability obviously improve.

Description of drawings

Accompanying drawing is the utility model circuit theory diagrams

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

The utility model can utilize existing low-pressure reactive compensation automatic control equipment 2, compensation condenser C1, filtering current limiting reactor L1, in the accompanying drawing, with power supply 1 and the circuit between 3 of loading is that example is done by the low-voltage bus bar of compensation equipment, then the annexation of circuit is: a separated time of isolating switch S1 one termination low-voltage bus bar, another termination variac T3, each pressure regulation level lead-out wire of variac T3 connects with the corresponding tap position of automatic pressure regulating device S3 respectively, the common point of automatic pressure regulating device S3 is the pressure regulation output, this output termination building-out capacitor C1 and filtering current limiting reactor L1, on low-voltage bus bar, be connected to load current and detect instrument transformer T1, load current detects the signal input port of the output termination low-pressure reactive compensation automatic control equipment 2 of instrument transformer T1, and the voltage sample line of the voltage of low-voltage bus bar and building-out capacitor C1 inserts low-voltage reactive compensator capable simultaneously.

The utility model adopts variac T3 to cooperate to come pressure regulation with automatic pressure regulating device S3, be controlled by dynamic passive compensation automatic control equipment 2, according to by the variation of bucking-out system lagging reactive power, the operating voltage at dynamic adjustments compensation condenser C1 two ends, change the usage factor of capacitance, to regulate the reactive power total amount that compensation condenser C1 sends, realize the purpose of dynamic passive compensation.Its electromagnetic capacity of this variac T3 is 0.2-0.5 a times of maximum compensation capacity, and pressure regulation progression is the 8-16 level.

Automatic pressure regulating device adopt have a big current switching capacity and have a multiple contact switch that switches transition resistance, as the relay conversion group etc., these need be according to the size of power, the current switching capacity can be in the 30-200A scope, design and assembly voluntarily.

But extraordinary variac T3 and automatic pressure regulating device S3 partial installation also can fuse.

After being connected on the load current detection instrument transformer T1 and busbar voltage access low-pressure reactive compensation automatic controller 2 on the bus; parameters such as system is meritorious through measuring and analyze, calculating, reactive power and harmonic wave; and control automatic pressure regulating device S3 and isolating switch S1, realize dynamic auto adjusting and protection respectively.Pressure regulation output end current instrument transformer T2 detects effective offset current, and compensation arrangement carried out over-current detection, also detect the operating voltage of compensation arrangement simultaneously, compensation condenser C1 and filtering current limiting reactor L1 constitute the filtering compensation loop, to reach the purpose of level and smooth compensation.

Grade pressure-adjusting type low pressure dynamic reactive compensator of being made up of each part mentioned above that has makes full use of the characteristics that the big and automatic pressure regulating device pressure regulation of autotransformer transmission capacity does not have breakpoint, can be used for the reactive power compensation of 0.4KV low-pressure system.Have the pressure regulation process electrical network is not had impact, low equipment investment, loss is little, the life-span is long, tracking velocity is fast advantage.

Claims

1, a kind of pressure-adjusting type low-pressure reactive compensation device, include reactive compensation automatic control device (2), compensation condenser C1, filtering current limiting reactor L1, by the low-voltage bus bar of compensation equipment, it is characterized in that adopting variac T3 and automatic pressure regulating device S3 to cooperate to come pressure regulation, a separated time of isolating switch S1 one termination low-voltage bus bar in the circuit, another termination variac T3, each pressure regulation level lead-out wire of T3 connects with the corresponding tap position of S3 respectively, the common point of S3 is the pressure regulation output, this output termination building-out capacitor C1 and filtering current-limiting reactor L1, be connected to load current on the low-voltage bus bar and detect instrument transformer T1, the signal input port of the output termination low-pressure reactive compensation automatic control equipment (2) of T1, the voltage sample line of low-voltage bus bar and building-out capacitor C1 inserts low-pressure reactive compensation automatic control equipment (2).

2, pressure-adjusting type low-pressure reactive compensation device as claimed in claim 1 is characterized in that current detecting instrument transformer T2 is arranged between automatic pressure regulating device S3 and the compensation condenser C1, and building-out capacitor C1 has been connected to the filtering current limiting reactor L1 of weakening effect.

3, pressure-adjusting type low-pressure reactive compensation device as claimed in claim 1 is characterized in that said automatic pressure regulating device S3 has multicontact switch high current capacity and that the switching transition resistance is arranged.

4, as claim 1 or 3 described pressure-adjusting type low-pressure reactive compensation devices, it is characterized in that said do that automatic pressure regulating device S3 selects for use have a high current capacity and the multicontact switch that switches transition resistance is arranged, its current capacity is 30-200A.

5, pressure-adjusting type low-pressure reactive compensation device as claimed in claim 1 is characterized in that 0.2-0.5 that said its electromagnetic capacity of variac T3 is maximum compensation capacity doubly, and pressure regulation progression is the 8-16 level.