CN2157540Y

CN2157540Y - AC voltage regulator capable of bypassing during no interruption of current

Info

Publication number: CN2157540Y
Application number: CN 93217558
Authority: CN
Inventors: 沙万乾
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-01
Filing date: 1993-07-01
Publication date: 1994-02-23
Anticipated expiration: 2003-07-01

Abstract

The utility model relates to an AC voltage regulator capable of bypassing during no interruption of current, which belongs to an AC voltage regulator. The utility model comprises a compensating transformer, a feedback transformer, a primary coil, a tripping device, a short circuit device and a control device, wherein, the compensating transformer which is connected between input terminals and output terminals of the utility model provides compensating voltage; the feedback transformer which is connected between the output terminals of the utility model makes the output voltage of the utility model to be fed back to the primary coil of the compensating transformer; the tripping device which can cut off the process that feedback transformer is connected between the output terminals of the utility model; the short circuit device can make the primary coil of the compensating transformer become a short circuit, and the control device can control the tripping device and the short circuit device to make any one of the tripping device and the short circuit device work at any time.

Description

AC voltage regulator capable of bypassing during no interruption of current

The utility model relates to a kind of AC voltage regulator, relates in particular to a kind of AC voltage regulator of the bypass of can not cutting off the power supply.

The major loop structure of SJW on sale in the market series alternating current large-power voltage stabilizer as shown in Figure 1, TP is a compensator transformer, AT is the pillar variac, as feedback transformer, a, b are its sliding brush, A ₁, A ₂Be the normally opened contact of two contactors (or automatic switch), B ₁Normally opened contact for bypass contactor.Under the normal condition, A ₁, A ₂Closure, B ₁Disconnect.Stabilizer output voltage U _OEqual the stack of input voltage Ui and bucking voltage △ U.Chain gearing that pillar autotransformer AT is had and brush etc. damage easily, overhaul when therefore this transformer breaks down and need, and when perhaps needing to change the parts of wearing and tearing, be with contacts of contactor A ₁, A ₂Open, then, with contacts of contactor B ₁Connect.Like this, input voltage Ui directly delivers to output terminal, and two transformers can carry out operation to it all by bypass.

There are two main shortcomings in the circuit structure of Fig. 1.At first, when needs carry out bypass, must disconnect A earlier ₁A ₂, close B again ₁(if step is opposite, contacts of contactor B ₁Can burn because of the huge induction current that transformer TP produces), like this, just there is the state of a temporary transient outage, this can influence the safe handling of follow-up equipment, for the equipment of sudden power in use, endangers bigger.Secondly, under the situation of the very big high power AC voltage stabilizer of capacity, flow through contacts of contactor A ₁, A ₂And B ₁Electric current very big, thereby they must have big capacity, thereby the cost of voltage stabilizer is increased greatly.

The utility model purpose is to provide a kind of AC voltage regulator that can not carry out bypass and can reduce cost with cutting off the power supply.

AC voltage regulator of the present utility model comprises: the compensator transformer that is connected on the voltage that affords redress between the input end of voltage stabilizer and the output terminal; Be connected in parallel on the feedback transformer between the output end of voltage stabilizer, it feeds back to stabilizer output voltage the primary coil of above-mentioned compensator transformer; Connect into the tripper that is connected that can cut off output end of voltage stabilizer and described feedback transformer; Can be with the short-circuiting means of the primary coil short circuit of described compensator transformer; Control device is controlled to of having only at any time among both with above-mentioned tripper and short-circuiting means and works.

According to AC voltage regulator of the present utility model, described tripper can disconnect described feedback transformer, and described short-circuiting means can be with the primary coil short circuit of described compensator transformer, like this, the input voltage of voltage stabilizer is directly exported as output voltage through the secondary coil of compensator transformer.That is to say the bypass that not cut off the power supply.In addition, in order to ensure the safety of the maintenance job of when feedback transformer is disconnected, being done, an earthing device can be set in addition, with feedback transformer ground connection.

Because tripper and short-circuiting means are used for Control and Feedback transformer and compensator transformer, thereby the electric current of flowing through wherein is less, the less contactor of their active volumes realizes, thereby reduced the cost of manufacture of whole voltage stabilizer.

Hereinafter with reference to description of drawings preferred embodiment of the present utility model, therefrom also can find out other purpose of the present utility model and advantage, same numeral is represented same parts among the figure.

Fig. 1 is the major loop structure figure of existing SJW series AC voltage regulator.

Fig. 2 is the major loop structure figure of the AC voltage regulator of the utility model preferred embodiment.

Fig. 3 is the control circuit figure of Fig. 2 embodiment.

Referring to Fig. 2 and Fig. 3, wherein KL is the main switch of voltage stabilizer, A ₃, A ₅Be the normally opened contact of contactor A, B ₂, B ₄Normally opened contact for contactor B.SA is the voltage stabilizing button, and TA is the maintenance button.A ₄, B ₃Be respectively the normally closed contact of contactor A, B.

Generally, main switch KL closure is pressed stabilized switch SA, and contactor A gets electric, contact A ₃, A ₅Closure is in the self-insurance state, contact A ₄Disconnect, guarantee contactor B outage, contact B ₂, B ₃Keep shown position, voltage stabilizer begins voltage stabilizing work.

If press service switch TA, at first, contactor A outage, contact A ₃, A ₅Disconnect, and A ₄Closure, so contactor B get electric, contact B ₂, B ₄Closure is in the self-insurance state, and B ₃Disconnect, guarantee that contactor A can not connect simultaneously.Like this, the contact B that is closed of the primary coil of compensator transformer TP ₂Short circuit, the contact A of disconnection ₃Then feedback transformer AT is disconnected, input voltage Ui only plays the current transformer effect this moment through compensator transformer TPC) secondary coil, directly as output voltage U _O

Again grounding switch KD is closed, just can carry out safe maintenance job feedback transformer AT.

After the maintenance, only need cut-off switch KD, press voltage stabilizing button SA, can recover voltage stabilizing.

In the foregoing description, each contactor device that also available air switch etc. is suitable substitutes.

Above embodiment is that example is described with the single-phase AC voltage stabilizing, but the utility model obviously also can be used for three-phase and more heterogeneous voltage stabilizing.Each is made structure shown in Figure 2 mutually gets final product.

Claims

1, a kind of AC voltage regulator comprises the compensator transformer of the voltage that affords redress between the input end that is connected voltage stabilizer and the output terminal; Be connected the feedback transformer between the output end of voltage stabilizer, it feeds back to the primary coil of described compensator transformer with stabilizer output voltage, it is characterized in that it also comprises:

Connect into and to cut off the tripper that is connected between described feedback transformer and the described output end of voltage stabilizer;

Can be with the short-circuiting means of the primary coil short circuit of described compensator transformer;

Control device is controlled described tripper and short-circuiting means and is made at any time all have only one of them to work.

2, AC voltage regulator as claimed in claim 1 is characterized in that, described tripper and short-circuiting means are formed by contactor.

3, AC transformer as claimed in claim 1 is characterized in that, also comprise one can be with the grounding switch of described compensator transformer primary coil ground connection.