CN201514844U

CN201514844U - Switch for on-load adjusting capacity of capacity adjustable transformer in power network of 20 KV and below

Info

Publication number: CN201514844U
Application number: CN200920203211XU
Authority: CN
Inventors: 邹鹏; 贾继莹; 栾大利; 丛培泉
Original assignee: LIAONING JINLI ELECTRIC POWER EQUIPMENT CO Ltd
Current assignee: LIAONING JINLI ELECTRIC POWER EQUIPMENT CO Ltd
Priority date: 2009-09-11
Filing date: 2009-09-11
Publication date: 2010-06-23
Anticipated expiration: 2019-09-11

Abstract

The utility model provides a switch for on-load adjusting the capacity of a capacity adjustable transformer in a power network of 20 KV and below, which aims to solve the problems that the non-excited capacity adjusting switch used in the present capacity adjustable transformer can only be operated manually to change the capacity of the transformer when the transformer is power off, thus the energy conservation and consumption reduction effects of the transformer can not be effectively played; and when the capacity of the transformer is small, the sudden increase of the load of the transformer can burn up the transformer. The utility model has the key points that a main contact comprises a plurality of movable contacts and static contacts in series connection, and serial multi-breaks can be formed by the movable contacts and the static contacts; and a transitional contact terminal comprises a plurality of movable contacts and static contacts in series connection, serial multi-breaks can be formed by the movable contacts and the static contacts, and then the transitional contact terminal is connected with a transitional resistor in series. The utility model has benefit that the capacity of the transformer can be automatically changed according to the load variation under the on-load state of the transformer, thereby effectively playing the energy conservation and consumption reduction effects of the transformer.

Description

Have and carry the switch of regulating capacitance-adjustable transformer in 20kV and the following electrical network

Technical field

The utility model relates to the capacitance-adjustable transformer that uses and a switch that carry to regulate this transformer capacity is arranged in 20KV and following electrical network, be specifically a kind of have under the state of carrying at transformer regulate the loaded capacity-regulated switch of transformer capacity automatically according to load variations.

Background technology

The energy-saving and cost-reducing of electric power system is the important component part that realizes conservation-minded society.

The load of agricultural electricity consumption has obvious seasonal, and the highest at the harvest season load, electricity consumption is maximum, requires the capacity of transformer bigger; All the other electricity consumptions in season are less, require the capacity of transformer less.Also marked change of Fu He size simultaneously with day alternates with night.Installation capacity transfer quantitative change depressor because being the increase with the transformer capacity, the loss of transformer itself increases, so can solve this waste of energy (when the big capacity of transformer, electricity consumption is less, generation than lossy) effectively.

What capacitance-adjustable transformer used at present is no excitation capacity transfer switch, and it can only be changed the capacity of capacitance-adjustable transformer by this switch of manual operation when transformer has a power failure.This operating time is long, process is loaded down with trivial details, also brings inconvenience to electricity consumption simultaneously.Because this switch of operation is very inconvenient, not operation in time can not be brought into play the Energy Saving for Transformer effect effectively when load variations.And when the transformer low capacity, increase transformer load suddenly and can burn transformer.

Summary of the invention

In order to bring into play the Energy Saving for Transformer effect effectively, the purpose of this utility model be to provide a kind of have carry the switch that is adjusted in the capacitance-adjustable transformer capacity that uses in 20KV and the following electrical network.

Capacitance-adjustable transformer has two capacity of size, and transformer high-pressure side winding when big capacity is the corner connection operation, is that star connects operation during low capacity.Low-pressure side is divided into I, II, three sections windings of III, three sections windings in series operation during low capacity, and I during big capacity moves with the III windings in series after the parallel connection of II winding again.

Transformer has the task switching that will finish Transformer Winding when carrying, and technical difficult points is the problem of high-pressure side contact reliable blow-out in the handoff procedure of star angle.

Generally speaking, in loaded switch, the switching capability of a contact breakpoint can not be higher than 2000V, the voltage that the capacity transfer switch switches when variable star angle reaches 10000 ÷ 1.732=5773V, and (with phase voltage 10KV electric pressure is example, down together), the utility model is according to series connection multi-break principle for this reason, several sound contact is cascaded forms a plurality of fractures, allow a very high switched voltage (5773V) share on N the fracture, if N=5, then the recovery voltage of each fracture is not higher than 1155V, and N dynamic/static contact together moves the task that single contact can not be finished of having finished.Briefly, Center for architecture of the present utility model is exactly: the multi-break technology of will connecting is applied on the loaded switch, to realize the switching to high voltage.Said loaded switch comprises transmission mechanism, quick mechanism, insulation rotating shaft, high pressure moving contact system, the quiet high pressure transition resistance of high pressure R, low pressure moving contact system, low pressure fixed contact system, low pressure transition resistance R ' and the main contact and the transition contact that are formed by dynamic and static contact system.

Technical scheme of the present invention is, loaded switch comprises main contact and transition contact, and said main contact is to be composed in series by several moving contacts and fixed contact, forms the series connection multi-break by them; Said transition contact is to be composed in series by several moving contacts, fixed contact, forms the series connection multi-break by them, and connects with transition resistance; When transformer high-voltage side winding is a star when connecing, transition contact one end is connected to the end of transformer high-voltage side winding through transition resistance, and main contact connects the end of adjacent two windings; When transformer high-voltage side winding was corner connection, transition contact one end was connected to the end of transformer high-voltage side winding through transition resistance, and one of main contact terminates at the end of winding, and the other end is connected on the top of adjacent winding.The present invention to a plurality of fractures that formed by several moving contacts and fixed contact, makes each fracture voltage be lower than blowout voltage a switched voltage mean allocation when finishing the star angle task switching of Transformer Winding.

Compared with prior art, the invention has the beneficial effects as follows: have under the state of carrying at transformer to change transformer capacity automatically, make energy-saving and cost-reducing target that reliable assurance arranged according to load variations.

Description of drawings

Further specify the present invention below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the stereogram of Fig. 1 mesohigh moving contact system.

Fig. 3 is that Fig. 2 is along T-T line profile, i.e. T-T layer schematic diagram.

Fig. 4 is that Fig. 2 is along S-S line profile, i.e. S-S layer schematic diagram.

Fig. 5 is that Fig. 2 is along F-F line profile, i.e. F-F layer schematic diagram.

Fig. 6-10 switches to the schematic diagram of each state successively when being changed to star and connect by corner connection for the high-pressure side winding, the upper right corner of each state diagram is the electrical schematic diagram of this state, and all the other are the pairing view of high pressure moving contact system.Specifically be

Fig. 6 is the corner connection view.

Fig. 7 is a transition state I schematic diagram.

Fig. 8 is a transition state II schematic diagram.

Fig. 9 is a transition state III schematic diagram.

Figure 10 is that star connects view.

Each state electrical schematic diagram when Figure 11-13 changes to series connection for the low-pressure side winding by parallel connection specifically is

State diagram when Figure 11 is the parallel connection of low-pressure side winding, its corresponding high-pressure side corner connection.

Figure 12 is the transition state schematic diagram.

The state diagram of Figure 13 low-pressure side windings in series, its corresponding high-pressure side star connects.

Embodiment

Referring to Fig. 1, said loaded capacity-regulated switch comprises transmission mechanism and quick mechanism 1, rotating shaft 2, high pressure moving contact system 4, high pressure fixed contact system 5, high pressure transition resistance 6 insulate, low pressure moving contact system 7, low pressure fixed contact system 8, low pressure transition resistance 9 and insulating cylinder 10, high pressure and low pressure moving contact system are fixed in the insulation rotating shaft, and high pressure and low pressure fixed contact system are fixed on the insulating cylinder.

Referring to Fig. 2-5, with A is example mutually, high pressure moving contact system is a three-decker, be F-F layer, S-S layer and T-T layer from bottom to top, fixed contact B is connected with Transformer Winding high-pressure side B or C, three neutral point fixed contacts are interconnected to constitute transformer envelope asterism, and fixed contact X is connected in the X end (referring to Fig. 6-10) of A phase winding.Fixed contact M1, the M2 of T-T layer, the effect of M3, M4 are to form the series connection multibreak, so there is not external lead wire.

The main contact line 12 of high-voltage contact system is: initiatively contact 1-1 is wired to the active contact 2-1 of S-S layer on the F-F layer, and initiatively contact 3-1 is wired to the active contact 1-2 of F-F layer on the T-T layer.

Said transition contact line 11 is: F-F layer 1-1 is connected to S-S layer transition moving contact 2-2 by the resistance other end after connecting transition resistance.T-T layer transition moving contact 3-2 is connected to transition moving contact 3-3 by lead, and S-S layer transition moving contact 2-3 receives transition moving contact 1-3 by lead.

The course of work is:

(1) when the big capacity corner connection of needs, because the winding X of A phase end is connected to fixed contact X, be connected to fixed contact B through active contact 1-1,2-1, M3,3-1,1-2, connect with high pressure B (or C is mutually), realize that the angle type connects, and sees Fig. 6.

(2) beginning connects switching to star, and whole moving contact system (present embodiment be counterclockwise) rotates, when arriving position shown in Figure 7, in the transition resistance place in circuit, connecting path is: through active contact 1-1, transition resistance, transition moving contact 2-2, M2, transition moving contact 3-2, transition moving contact 3-3, M1, transition moving contact 2-3, transition moving contact 1-3 receives B.

(3) the moving contact system is rotated further, and when arriving position shown in Figure 8, main contact disconnects major loop, and by between 2-1 and the M3, between M3 and the 3-1, forms three place's fractures between 1-2 and the B, and blowout voltage is born in three fractures series connection jointly.

When (4) forwarding Fig. 9 position to, initiatively contact inserts neutral point, and connecting path is: the winding X of A phase holds through active contact 1-1,2-1, and M4,3-1,1-2 is connected to neutral point, and this moment, transition resistance did not disconnect.

When (5) rotating to Figure 10 position at last, initiatively the winding star that contact will transformer connects, but the transition resistance loop disconnects, and between 2-2 and M2, between M2 and the 3-2, between 3-3 and the M1, between M1 and the 2-3, form five place's fractures between 1-3 and the B, the blow-out reliably of above fracture series connection common guarantee.

Finish to the handoff procedure that star connects by corner connection since then.Opposite process is that the counter-rotation contact gets final product, and detailed process slightly.

For guaranteeing the stable of output voltage, the low-pressure side winding need carry out series-parallel switching simultaneously, referring to Figure 11-13.Detailed process following (is example mutually with A):

At first be in parallel, a of low pressure winding, a3 connects, a2, a4 connects, referring to Figure 11, its corresponding high-pressure side corner connection state;

When forwarding Figure 12 position to, a2, a4 disconnects, and a, a3 directly connect disconnection, and transition resistance inserts wherein;

Forward Figure 13 at last to, a3, a2 connects, and transition resistance disconnects, and finishes series connection, and its corresponding high-pressure side star connects state.

Claims

1. one kind has and carries the switch be adjusted in the capacitance-adjustable transformer capacity that uses in 20KV and the following electrical network, loaded switch comprises main contact and the transition contact that is formed by dynamic and static contact system, it is characterized in that: said main contact is to be composed in series by several moving contacts and the fixed contact that can form the series connection multi-break, said transition contact is to be composed in series by several moving contacts, the fixed contact that can form the series connection multi-break, and connects with transition resistance; When transformer high-voltage side winding is a star when connecing, transition contact one end is connected to the end of transformer high-voltage side winding through transition resistance, and main contact connects the end of adjacent two windings; When transformer high-voltage side winding was corner connection, transition contact one end was connected to the end of transformer high-voltage side winding through transition resistance, and one of main contact terminates at the end of winding, and the other end is connected on the top of adjacent winding.

According to claim 1 described have carry the switch be adjusted in the capacitance-adjustable transformer capacity that uses in 20KV and the following electrical network, it is characterized in that: said main contact forms three fractures series connection, transition contact forms five fractures series connection.

According to claim 1 or 2 described have carry the switch be adjusted in the capacitance-adjustable transformer capacity that uses in 20KV and the following electrical network, it is characterized in that: said high pressure moving contact system is a three-decker, be F-F layer, S-S layer and T-T layer from bottom to top, fixed contact B connects with Transformer Winding high-pressure side B (or C mutually), three neutral point fixed contacts are interconnected to constitute transformer envelope asterism, fixed contact X is connected in the X end of A phase winding, and the T-T layer has fixed contact M1, M2, M3, M4, does not have external lead wire;

The main contact line is: initiatively contact (1-1) is wired to the active contact (2-1) of S-S layer on the F-F layer, and initiatively contact (3-1) is wired to the active contact (1-2) of F-F layer on the T-T layer;

The transition contact line is: after F-F layer (1-1) connects transition resistance, be connected to S-S layer transition moving contact (2-2) by the resistance other end, T-T layer transition moving contact (3-2) is connected to transition moving contact (3-3) by lead, and S-S layer transition moving contact (2-3) is received transition moving contact (1-3) by lead.