CN201312265Y

CN201312265Y - Silicon-controlled rectifying device

Info

Publication number: CN201312265Y
Application number: CNU2008201734214U
Authority: CN
Inventors: 商锦宁; 宁寿陈; 王仁波; 顾建东; 成进军
Original assignee: Yantai Lubao Steel Pipe Co Ltd
Current assignee: Yantai Lubao Steel Pipe Co Ltd
Priority date: 2008-10-21
Filing date: 2008-10-21
Publication date: 2009-09-16
Anticipated expiration: 2018-10-21

Abstract

The utility model discloses a silicon-controlled rectifying device, comprising a direct current dynamo (9). A silicon-controlled rectifying bridge (5) is formed by connecting two or more three-phase fully-controlled rectifying bridges in parallel, each of which is provided with an independent rectifying device formed by silicon-controlled members. Alternating current main power supplies of all the rectifying devices of the silicon-controlled rectifying bridge (5) are connected with a rectifier transformer (1) through an ME main switch (2) after being connected in parallel, and output of all the rectifying devices of the silicon-controlled rectifying bridge (5) is connected with the direct current dynamo (9) through a shared direct current reactor (7) and a shared fast switch (8) after being connected in parallel. An alternating current main loop arranged below the ME main switch (2) is provided with a set of alternating current secondary current transformers (3) for detecting the main current of the alternating current main loop. Adjacent rectifying bridges implement current equalization by a current-equalizing transformer (4), and each rectifying bridge is provided with a shunt for detecting current. Controllable silicon corresponding to different rectifying bridges shares pulse. The silicon-controlled rectifying device is characterized by simple circuit, less investment, low failure rate and easy trouble shooting.

Description

A kind of silicon controlled rectifier

Technical field:

The utility model relates to industrial enterprise's electric automatization DC Transmission technical field, is a kind of silicon controlled rectifier specifically.

Background technology:

At present, when the controllable silicon rated current of silicon controlled rectifier can not satisfy the installed capacity requirement, mainly take two kinds of measures:

1, adopts the use in parallel of two or more same model controllable silicons.Controllable silicon is in parallel to be used, higher to the device property coherence request, and must take current-sharing measures such as series resistance and inductance.Controllable silicon is in parallel to be used, especially a plurality of controllable silicon parallel connections, and device parameters more or less there are differences, and causes the plant failure rate higher, and the trouble shoot difficulty;

2, adopt the rectifying device parallel connection.Usually be only limited to two cover rectifier bridges, rectifier transformer adopts the transformer of two platform independent or Circuit Fault on Secondary Transformer that two groups of independently windings are arranged, and one group is that Y connects, and one group is that Δ connects; Interchange ME main switch, current transformer, speed regulator, direct current reactor, high-speed switch adopt two covers respectively, the major loop complex circuit, and equipment investment is bigger.

Summary of the invention:

The purpose of this utility model is the deficiency that overcomes above-mentioned prior art, and provide a kind of silicon controlled rectifier, mainly solved the use in parallel of relatively large silicon controlled rectifier same model controllable silicon, problems such as the plant failure rate is higher, trouble shoot is difficult and adopt two to overlap the major loop complex circuit that the rectifying device parallel connections bring, and equipment investment is bigger.

In order to achieve the above object, the utility model is achieved in that a kind of silicon controlled rectifier, it comprises direct current machine, its special character is that the controllable silicon rectifying bridge group is formed in parallel by two or more three-phase full-controlled rectifier bridges, each rectifier bridge is formed independently rectifying device by silicon-controlled device, be connected with rectifier transformer by exchanging the ME main switch after all rectifying device ac main power parallel connections in the controllable silicon rectifying bridge group, all rectifying device output-parallels in the controllable silicon rectifying bridge group are after a common DC reactance device, a shared high-speed switch is connected with direct current machine; ME main switch below ac main circuit is installed a cover ac-side current instrument transformer and is detected usefulness as the ac main circuit total current, carry out current-sharing by equal current transformer between the rectifier bridge, each rectifier bridge is connected with independent shunt respectively, use as current detecting separately, and adopt independent ammeter to carry out the electric current demonstration respectively, so that system detects and fault inquiry.

A kind of silicon controlled rectifier of the present utility model, the shared pulse of the controllable silicon of the co-located of its described each rectifier bridge correspondence.

Compared with the prior art a kind of silicon controlled rectifier described in the utility model has following good effect: 1, adopt the method for attachment of this device for relatively large silicon controlled rectifier, both solve the higher problem of same model controllable silicon operative installations failure rate in parallel, solved the big problem of major loop complex circuit, equipment investment that adopts two cover rectifying device parallel connections to bring again; 2, this device is earlier silicon-controlled device to be formed rectifier bridge, again with a plurality of rectifier bridge parallel connections, only need to install an equal current transformer additional at the rectifier bridge ac main circuit, circuit is simple, be particularly suitable for the grafting renovation of old silicon controlled rectifier, both can make full use of equipment such as original rectifier transformer, interchange ME main switch, current transformer, speed regulator, direct current reactor, high-speed switch, reduce equipment investment; Can solve original many same model silicon-controlled devices high problem of bringing of equipment failure rate of using in parallel again; 3, adopt this device, because each rectifier bridge adopts independent electric current to show, controllable silicon has fault directly to show by place rectifier bridge ammeter, satisfying open failure rectification bridge circuit under the capacity requirement prerequisite, promptly a covering device breaks down, system still can use, and greatly reduces equipment fault.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Embodiment:

In order to understand better and to implement, provide specific embodiment below in conjunction with accompanying drawing and describe a kind of silicon controlled rectifier of the utility model in detail.

Embodiment 1, referring to Fig. 1, with two cover rectifying devices is example, silicon-controlled device is formed two respectively overlap independently rectifying device, i.e. two rectifier bridges, two rectifier bridges also are unified between 5, two rectifier bridges of controllable silicon rectifying bridge group and carry out current-sharing by equal current transformer 4, so that the uniform distribution of two groups of device electric currents; Two rectifier bridges are connected with independent shunt 6 respectively, adopt independent electric current to show, so that system detects and fault inquiry; Be connected with the rectifier transformer 1 that both sides are simplex winding by exchanging ME main switch 2 after the parallel connection of two rectifier bridge ac main powers, ac main circuit is installed a cover ac-side current instrument transformer 3 and is detected usefulness as total current; The shared pulse of the controllable silicon of the co-located of two rectifier bridge correspondences; Two rectifier bridge output-parallels after common DC reactance device 7, a shared high-speed switch 8 be connected with direct current machine 9.

A kind of silicon controlled rectifier described in the utility model, during use, to exchange the ME main switch closes, direct current machine adds the high-speed switch that closes after the excitation, the phase shift angle of the shared pulse of controllable silicon that changes the co-located of rectifier bridge correspondence by the given voltage of regulating electric current, rotating speed double closed-loop control system is controlled rectifier bridge group voltage, electric current, thus control motor speed, torque.

Claims

1, a kind of silicon controlled rectifier, it comprises direct current machine (9), it is characterized in that controllable silicon rectifying bridge group (5) is formed in parallel by two or more three-phase full-controlled rectifier bridges, each rectifier bridge is formed independently rectifying device by silicon-controlled device, be connected with rectifier transformer (1) by exchanging ME main switch (2) after all rectifying device ac main power parallel connections in the controllable silicon rectifying bridge group (5), all rectifying device output-parallels in the controllable silicon rectifying bridge group (5) are after a common DC reactance device (7), a shared high-speed switch (8) is connected with direct current machine (9); ME main switch (2) below ac main circuit is installed a cover ac-side current instrument transformer (3) and is detected usefulness as the ac main circuit total current, carry out current-sharing by equal current transformer (4) between the rectifier bridge, each rectifier bridge is connected with independent shunt (6) respectively, uses as current detecting separately.

2, a kind of silicon controlled rectifier according to claim 1 is characterized in that the shared pulse of controllable silicon of the co-located of described different rectifier bridge correspondence.

3, a kind of silicon controlled rectifier according to claim 1 and 2 is characterized in that described each rectifier bridge adopts independent ammeter to show respectively respectively.