CN201259825Y

CN201259825Y - Thyristor resistor transition switching on-load tapping changing switch

Info

Publication number: CN201259825Y
Application number: CNU2008201522193U
Authority: CN
Inventors: 肖日明; 肖毅; 肖申
Original assignee: Shanghai Huaming High-Voltage Electrical R&d Co Ltd; SHANGHAI HUAMING HIGH-VOLTAGE SWITCHGEAR Co Ltd; Shanghai Huaming Power Equipment Co Ltd
Current assignee: Shanghai Huaming High-Voltage Electrical R&d Co Ltd; SHANGHAI HUAMING HIGH-VOLTAGE SWITCHGEAR Co Ltd; Shanghai Huaming Power Equipment Co Ltd
Priority date: 2008-08-21
Filing date: 2008-08-21
Publication date: 2009-06-17
Anticipated expiration: 2018-08-21

Abstract

The utility model relates to an on-load tapping changing switch for transition and switching of thyristor resistance, comprising a switching circuit; the on-load tapping changing switch is characterized in that: the switching circuit comprises a thyristor switching circuit and a transition resistor branch circuit composed of a transition thyristor switch and a transition resistance; compared with the existing on-load tapping changing switch for transition and switching-over of mechanical switch resistance, the on-load tapping changing switch in the utility model has the advantages that: 1. switching without arcing is realized, and the electric life time of the switch is not limited by switching times. 2. when each moving contact terminal of the mechanical switch is disconnected or connected with a static contact terminal, the voltage is not more than the conducting voltage drop (1V to 2V) of the thyristor; meanwhile, restoring voltage of the on-load tapping changing switch for transition of the traditional resistance can reach step voltage by one time or above; the undertaking tasks of the mechanical switch of the above two is different. 3. the workload and cost of preventive maintenance are reduced.

Description

Thyristor resistor transition switching on-load tap-changer

Background technology

The utility model relates to on-load tap changers of transformers technical field, particularly thyristor resistor transition switching on-load tap-changer.

Background technology

The on-load tap changers of transformers that resistor transition, mechanical switch contact switch is since the German succeeds in developing before eight more than ten years, and this technology is in use to the present.Existing resistor transition, mechanical switch contact switching on-load tap-changer have following deficiency:

Because the mechanical switch contact cut-off in the moment at random of transformer sine-wave current, can produce electrical arc erosion when 1, switching, this makes the electric life of switch short, and power supply trouble takes place easily.

2, the transformer oil in the diverter switch grease chamber is polluted in the arcing of diverter switch contact generation easily, has shortened maintenance period, has increased the physical deterioration that maintenance load and maintenance produce.

The utility model content

Technical problem to be solved in the utility model is to provide thyristor resistor transition switching on-load tap-changer, to solve existing resistor transition, the existing many weak points of mechanical switch contact switching on-load tap-changer.

Technical problem to be solved in the utility model can be achieved through the following technical solutions:

Thyristor resistor transition switching on-load tap-changer comprises one and switches circuit, it is characterized in that, described commutation circuit comprises the transition resistance branch road that thyristor switching switch circuit and transition thyristor switch and transition resistance constitute.

Thyristor diverter switch in the described thyristor switching switch circuit and transition thyristor switch all adopt thyristor inverse parallel alternating-current switch.

The characteristic of thyristor resistor transition switching on-load tap-changer of the present utility model is as follows:

1, mechanical switch is through-flow for a long time, and thyristor switch does not have electric arc and switches, and thyristor can not adorned radiator.

2, it is open-minded, simple in structure directly to control gate pole triggering thyristor from the anode introducing voltage of thyristor by little electric current mechanical switch, reliable operation, and antijamming capability is strong.The passing through current ratio and can ignore of gate current and on load tap changer, and trigger back thyristor anode voltage and reduce near zero volt at once, the gate current time is very short, does not have electric arc on the little current switch contact and takes place.

3, during each switch load, thyristor always cut-offs the load current of former tap at the zero crossing of transformer current; In the process of switching, the moving contact of each mechanical switch with decide that contact disconnects or voltage during connection is no more than the conduction voltage drop of thyristor.

4, compare with the traditional resistor transition switching on-load tap-changer, removing no electric arc switches, outside structure is comparatively simple, other is all more approaching, manufacturing, being convenient to integrate with traditional on load tap changer in aspects such as test and use, is that on load tap changer switches the bridge that develops to direct switching from resistor transition.

The utility model thyristor resistor transition switching on-load tap-changer and existing mechanical switch resistance transition switching on-load tap-changer relatively have following advantage:

1, realized that no arc switches, the electric life of switch is not subjected to the restriction of switching times.

2, in the process of switching, the moving contact of each mechanical switch with decide that contact disconnects or voltage during connection is no more than the conduction voltage drop (1 volt to 2 volts) of thyristor; And the recovery voltage of traditional resistor transition on load tap changer can reach 1 times or above step voltage.The mechanical switch task of bearing is greatly different between the two.

3, the workload and the cost of care and maintenance have been reduced.

Description of drawings:

Fig. 1 is the switching main circuit schematic diagram of the box-like resistor transition switching on-load tap-changer of the utility model thyristor groups; Among Fig. 1: to be that the single, double number of mechanical switch is through-flow decide contact for K1, K2, and R is a transition resistance, and V1, V2, V3 are thyristor inverse parallel alternating-current switch, X is the tap common port, S01, S02, S03 are little electric current mechanical switch, and It is a transformer current, and I, II are single, double several tap end.

Fig. 2 is the switching main circuit schematic diagram of the utility model thyristor combined type resistor transition switching on-load tap-changer; N-1, n, n+1 are that tap is decided contact, and S01, S02, S03 are little electric current mechanical switch, and R is a transition resistance, K1 ', K2 ' are the through-flow moving contact of the single, double number of mechanical switch, X is the tap common port, and V1, V2, V3 are thyristor inverse parallel alternating-current switch, and It is a transformer current.

Fig. 3 is the circuit theory diagrams of the thyristor inverse parallel alternating-current switch of the utility model thyristor resistor transition switching on-load tap-changer; Among Fig. 3: V11, V12 are thyristor, and FV is the voltage protection module, and GM11, GM12 are the gate pole module.

Fig. 4 is the gate pole modular circuit schematic diagram among Fig. 3; Among Fig. 4: C1 is a capacitor, and R1 is a resistor, and D is a diode.

Fig. 5 is a voltage protection modular circuit schematic diagram among Fig. 3; Among Fig. 5: C0 is a capacitor, and R0 is a resistor, and RV is a varistor.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Embodiment 1

What present embodiment was described is the thyristor resistor transition combined loaded tap-changer, comprises one and switches circuit, and its commutation circuit comprises the transition resistance branch road that thyristor switching switch circuit and transition thyristor switch and transition resistance constitute.

Referring to Fig. 1, odd number tap and even numbers tap decide all be connected to thyristor diverter switch branch road on the contact, also be connected to the transition resistance branch road that transition thyristor switch and transition resistance constitute in even numbers tap side.

During switching, connect corresponding gate circuit transistor gate earlier, make thyristor between former tap and new tap, connect the transition resistance branch road and pass through transformer current; After disconnect the gate pole circuit of one of two thyristor switchs of connecting in the transition resistance branch road on demand, just can when the transformer current zero crossing that occurs thereafter, finish the switching that is switched to new tap from former.The moment that switches on and off thyristor switch gate pole circuit needn't be considered the zero crossing of electric current, the gate pole of available little electric current mechanical switch control thyristor.

In order to realize above-mentioned handoff procedure and guarantee reliability service that thyristor resistor transition composite type switching switch circuit mainly adopts as lower member:

1, mechanical flow passage switch is decided contact K1, K2;

2, transition resistance R;

3, thyristor inverse parallel alternating-current switch V1, V2, V3 wherein also comprise the protection of thyristor and the element (seeing Fig. 3, Fig. 4, Fig. 5) of raising reliability;

4, the little electric current mechanical switch of thyristor gate polar circuit (seeing S01, S02 and S03 among Fig. 1).Little electric current mechanical switch is connected between the

terminal

3 and 4 among Fig. 3.

K1 → K2 switches explanation:

Initial condition: hold circulation transformer current It through K1 to X from odd number tap I end; Though gate controlled switch S01 connects, V1 is in door opening state, because of V1 not through-flow by the K1 short circuit; S02, S03 are in the state of cut-offfing, and V2 and V3 are obstructed, and they all bear step voltage.

K1 → K2 handoff procedure: when moving contact when deciding contact K1 and separate, V1 continues by transformer current It, K1 does not cut-off can produce electric arc; Thereafter S03 connects, through V1, V3 and the R circulation that between tap I and II, circulates, from tap I through the V1 It that circulates; Thereafter S01 cut-offs, and V1 cut-offs when the It zero crossing, and circulation stops, from tap II through R and V3 to the X It that circulates; Thereafter S02 connects, and V2 continues the V3 branch road by It, and V3 branch road stop is through-flow, and S03 turn-offs thereafter; When treating that moving contact and K2 connect, K2 continues the V2 branch road by It, and the V2 branch road is because of through-flow by K2 short circuit stop; Disconnect S02, turn-off the gate pole of V2 thereafter; Finishing switching behind the off-position on the moving contact arrival K2.

Embodiment 2

What present embodiment was described is thyristor resistor transition combined type on load tap changer (referring to Fig. 2).On two transition moving contacts, all be connected to thyristor diverter switch branch road, also be connected to the transition resistance branch road on a moving contact therein.When moving contact moves to switching position, connect the gate pole of relevant thyristor switch earlier, make this thyristor switch between former tap and new tap, connect the transition resistance branch road and pass through transformer current; After disconnect in this transition resistance branch road the gate pole circuit of one of two thyristor switchs of series relationship on demand, just can when the transformer current zero crossing of appearance thereafter, finish the switching that is switched to new tap from former.Needn't consider the zero crossing of electric current when switching on and off thyristor switch gate pole circuit, the gate pole of available little electric current mechanical switch control thyristor.

In order to realize above-mentioned handoff procedure and guarantee reliability service that thyristor resistor transition combined type switching switch circuit mainly adopts as lower member:

1, the through-flow moving contact K of mechanical switch;

2, mechanical switch transition moving contact K1 and K2;

3, thyristor inverse parallel alternating-current switch V1, V2 and V3 wherein also comprise the protection of thyristor and the element (seeing Fig. 3, Fig. 4 and Fig. 5) of raising reliability

4, transition resistance R;

5, little electric current machinery switch S 01, S02 and the S03 of thyristor gate polar circuit; Little electric current mechanical switch is connected between the

terminal

3 and 4 among Fig. 3.

The n of thyristor resistor transition combined type on load tap changer → n+1 tap is switched explanation:

Initial condition (moving contact is in the position among Fig. 2): transformer current It circulates to the X end through K from the n tap; V1, V2 and V3 are not through-flow; S01, S02 and S03 disconnect.

N → n+1 handoff procedure: S01 connects after moving contact moves, and the V1 gate pole is opened; When K moves to when deciding contact and leave with the n tap, It is continuous through-flow to the X termination through K1, V1 from the n tap, and not cut-offfing of K can produce electric arc; After this S03 connects the gate pole of opening V3, produces circulation through K1, V1, V3, R and K2 between n and n+1 tap, and It circulates to the X end through K1, V1 from the n tap; Thereafter S01 disconnects, by the time after the It zero passage, It connects through K2, R, V3 from the n+1 tap; Thereafter S02 connects, and opens the gate pole of V2, and the V2 through-flow back of the V3 S03 that continues disconnects; When K moves to after the n+1 tap is decided contact and contacted, It is through-flow to the X end through K from the n+1 tap, and the V2 branch road is because of no longer through-flow by the K short circuit; Disconnect S02, turn-off the gate pole of V2 thereafter; Decide the contact center position and stop to move when K moves to the n+1 tap, handoff procedure finishes.

The characteristic of the thyristor resistor transition switching on-load tap-changer that the foregoing description 1 and example 2 are described is as follows:

Mechanical switch is through-flow for a long time, and thyristor switch does not have electric arc and switches, and thyristor can not adorned radiator.

It is open-minded, simple in structure directly to control gate pole triggering thyristor from the anode introducing voltage of thyristor by little electric current mechanical switch, reliable operation, and antijamming capability is strong.The passing through current ratio and can ignore of gate current and on load tap changer, and trigger back thyristor anode voltage and reduce near zero volt at once, the gate current time is very short, does not have electric arc on the little current switch contact and takes place.

During each switch load, thyristor always cut-offs the load current of former tap at the zero crossing of transformer current; In the process of switching, the moving contact of each mechanical switch with decide that contact disconnects or voltage during connection is no more than the conduction voltage drop of thyristor.

Claims

1. thyristor resistor transition switching on-load tap-changer comprises one and switches circuit, it is characterized in that, described commutation circuit comprises the transition resistance branch road that thyristor switching switch circuit and transition thyristor switch and transition resistance constitute.

2. thyristor resistor transition switching on-load tap-changer according to claim 1 is characterized in that, thyristor diverter switch in the described thyristor switching switch circuit and transition thyristor switch all adopt thyristor inverse parallel alternating-current switch.

3. thyristor resistor transition switching on-load tap-changer according to claim 2, it is characterized in that thyristor diverter switch in the described thyristor switching switch circuit and transition thyristor switch all adopt opening the door and closing the door of little electric current mechanical switch control thyristor.