CN203312819U

CN203312819U - Low-voltage reactive power compensation case

Info

Publication number: CN203312819U
Application number: CN2013203438305U
Authority: CN
Inventors: 郭铁峰; 刘晓新; 杜立武; 彭俊磊
Original assignee: FOSHAN CITY XIAOYING ELECTRIC Co Ltd
Current assignee: Guangdong Kitty Electric Co., Ltd.
Priority date: 2013-06-14
Filing date: 2013-06-14
Publication date: 2013-11-27
Anticipated expiration: 2023-06-14

Abstract

The utility model discloses a low-voltage reactive power compensation case which comprises ammeters, a voltmeter and a compensating circuit. The low-voltage reactive power compensation case is characterized in that the compensating circuit comprises a fuse switch disconnector connected with alternating current; the other end of the fuse switch disconnector is connected with a compensation capacitor loop successively through a current transformer, a fuse, an AC contactor and a relay; and the compensation capacitor loop is composed of a plurality of capacitors. Preferably, there are three ammeters which are all connected with the current transformer and used for displaying current flowing in the compensating circuit. There is one voltmeter which is connected with the fuse switch disconnector and used for displaying input voltage of the compensating circuit. In comparison with the prior art, the low-voltage reactive power compensation case disclosed by the utility model has characteristics of simple structure and high safety performance.

Description

A kind of low voltage reactive power conpensation box

Technical field

The utility model relates to the Technique of Compensating Capacitance for Reactive field, relates in particular to a kind of low voltage reactive power conpensation box.

Background technology

Alternating current is in by pure resistance, electric energy has all changed into heat energy, and in by pure capacitive or pure inductive load, do not do work. that is to say and do not consume electric energy, be reactive power. actual loading certainly, can not be pure capacitive load or pure inductive load, be generally all the Combination load, common are: motor, transformer, overhead wire and electric meter etc.Electric current, by them, just has the part electric energy not do work like this, is exactly reactive power, and power factor now is less than 1, in order to improve the utilance of electric energy, will carry out reactive power compensation.

The utility model content

The purpose of this utility model is to provide a kind of simple in structure, safe, low voltage reactive power conpensation box that man-machine interface is friendly.

For reaching above purpose, the utility model adopts following technical scheme.

A kind of low voltage reactive power conpensation box, comprise: ammeter, voltmeter, and compensating circuit, it is characterized in that, described compensating circuit comprises: the switch with knifeshaped fuse be connected with alternating current, the other end of switch with knifeshaped fuse are connected with the building-out capacitor loop by current transformer, fuse, A.C. contactor, relay successively; Described building-out capacitor loop is comprised of a plurality of electric capacity.

As with improvement, the quantity of described ammeter is three, and three ammeters all are connected with current transformer, are used for showing the size of current flow through in compensating circuit.

As with improvement, the quantity of described voltmeter is one, and this voltmeter is connected with switch with knifeshaped fuse, is used for showing the input voltage of compensating circuit.

Further with improvement, an end of described voltmeter is connected with the second, the 6th, the tenth binding post of voltage change-over switch, the other end of described voltmeter and voltage change-over switch the 4th, the 8th, the 12 binding post is connected.As with improvement, be connected with lightning arrester at the Nodes of current transformer and fuse.

As with improvement, the model of described switch with knifeshaped fuse is HR5-100/31, and the model of described current transformer is the LMZ-0.66-75/50.5 level, and the model of described A.C. contactor is CJ19-32, and described relay is thermal relay, and the model of thermal relay is JR36-63.

A kind of low voltage reactive power conpensation box that the utility model provides, adopt a plurality of electric capacity to form the building-out capacitor loop, simple in structure, low cost of manufacture.Simultaneously, by the ammeter be connected with the circuit instrument transformer and the voltmeter be connected with switch with knifeshaped fuse are set on reactive power compensating case, facilitate the electric current in user's Real Time Observation compensating circuit, the situation of change of voltage, man-machine interface close friend.In addition, because the Nodes at current transformer and fuse is connected with lightning arrester, effectively prevent thunderbolt, fail safe is good.

The accompanying drawing explanation

Figure 1 shows that a kind of low voltage reactive power conpensation box structural representation that the utility model provides;

Figure 2 shows that the connecting circuit figure of ammeter and current transformer;

Figure 3 shows that the connecting circuit figure of voltmeter and switch with knifeshaped fuse.

Embodiment

For further setting forth essence of the present utility model, by reference to the accompanying drawings embodiment of the present utility model is described as follows.

As shown in Figure 1, a kind of low voltage reactive power conpensation box, comprise: ammeter PA, voltmeter PV, and compensating circuit, it is characterized in that, described compensating circuit comprises: the switch with knifeshaped fuse QS be connected with alternating current, the other end of switch with knifeshaped fuse QS are connected with the building-out capacitor loop by current transformer TA, fuse FU, A.C. contactor KM, relay K H successively; Described building-out capacitor loop is comprised of N capacitor C, and N is integer, N >=3.

In the present embodiment, preferably the quantity of capacitor C is three, preferably the model of switch with knifeshaped fuse QS is HR5-100/31, preferably the model of current transformer TA is the LMZ-0.66-75/50.5 level, preferably the model of A.C. contactor KM is CJ19-32, preferably relay is thermal relay, and the model of thermal relay is JR36-63.

Wherein, as shown in Figure 2, the quantity of described ammeter PA is three, is respectively PA4, PA5, PA6, and three ammeter PA4, PA5, PA6 are connected with current transformer TA, are used for showing the size of current flow through in compensating circuit.

As shown in Figure 3, the quantity of described voltmeter PV is one, and this voltmeter PV is connected with voltage change-over switch, is used for showing the input voltage of compensating circuit.During concrete the connection, due to input is three-phase alternating current L1, L2, L3, the end of voltmeter PV is connected with the second, the 6th, the tenth binding post of voltage change-over switch, the other end of described voltmeter PV and voltage change-over switch the 4th, the 8th, the 12 binding post is connected.During work, select being connected between voltmeter PV and each binding post by voltage change-over switch CK, show respectively A phase, B phase, C phase voltage.

Further, for guaranteeing the fail safe of whole compensating circuit, be connected with lightning arrester F at the Nodes of current transformer TA and fuse FU.

Above embodiment has been described in detail essence of the present utility model, but can not to protection range of the present utility model, limit with this.Apparently, under the enlightenment of the utility model essence, the art those of ordinary skill also can carry out many improvement and modification, within it should be noted that these improvement and modification all drop on claim protection range of the present utility model.

Claims

1. low voltage reactive power conpensation box, comprise: ammeter, voltmeter, and compensating circuit, it is characterized in that, described compensating circuit comprises: the switch with knifeshaped fuse be connected with alternating current, the other end of switch with knifeshaped fuse are connected with the building-out capacitor loop by current transformer, fuse, A.C. contactor, relay successively; Described building-out capacitor loop is comprised of a plurality of electric capacity.

2. according to power, require 1 described a kind of low voltage reactive power conpensation box, it is characterized in that, the quantity of described ammeter is three, and three ammeters all are connected with current transformer, are used for showing the size of current flow through in compensating circuit.

3. a kind of low voltage reactive power conpensation box according to claim 1, is characterized in that, the quantity of described voltmeter is one, and this voltmeter is connected with switch with knifeshaped fuse, is used for showing the input voltage of compensating circuit.

4. a kind of low voltage reactive power conpensation box according to claim 3, it is characterized in that, one end of described voltmeter is connected with the second, the 6th, the tenth binding post of voltage change-over switch, the other end of described voltmeter and voltage change-over switch the 4th, the 8th, the 12 binding post is connected.

5. a kind of low voltage reactive power conpensation box according to claim 1, is characterized in that, is connected with lightning arrester at the Nodes of current transformer and fuse.

6. a kind of low voltage reactive power conpensation box according to claim 1, it is characterized in that, the model of described switch with knifeshaped fuse is HR5-100/31, the model of described current transformer is the LMZ-0.66-75/50.5 level, the model of described A.C. contactor is CJ19-32, described relay is thermal relay, and the model of thermal relay is JR36-63.