CN2189350Y

CN2189350Y - Switch for arc-extinguishing coil

Info

Publication number: CN2189350Y
Application number: CN 94225173
Authority: CN
Inventors: 王勇维; 田景林
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-01-24
Filing date: 1994-01-24
Publication date: 1995-02-08
Anticipated expiration: 2004-01-24

Abstract

The utility model relates to a load switch for an arc-extinguishing coil of a neutral point in 35-63KV electric power system, which is mainly composed of an arc-extinguishing device (1) -(11), an insulated part (12), lifting mechanisms (13) and (14), a mechanism box (15) and an electromagnetic mechanism (16), wherein, the outer side of an insulated cylinder (7) in the arc-extinguishing device (1) -(11) is wound with a linear mid-value resistor (8). Resistor contacts are transversely and oppositely arranged on both sides of a middle bore of an arc-insulating plate (2) and led out of the insulating cylinder (7) by a copper screw rod for connecting with a resistor. The upper end of the resistor is connected to a static contact. The electromagnetic mechanism is CD10F type, and namely a CD10 is inversely arranged 180 DEG right and left to directly operate the load switch up and down in order to close and separate. Therefore, a single-phase low-oil vertical independent integral body is formed. The utility model has the performance of opening and breaking inductive weak current. When the arc-extinguishing coil is opened and broken, the operating overvoltage is not generated.

Description

Switch for arc-extinguishing coil

The utility model relates to a kind of electric power system neutral point arc suppression coil on-load switch.

The arc suppression coil on-load switch of China transformer station, it is Japanese sesame Pu, the bulk-oil circuit-breaker of plant produced such as Fuji, operating mechanism and on-load switch are installed separately, floor space is big, because of no spare unit long neglected and in disrepair, add, backward in techniquely be eliminated gradually, but domesticly still do not have factory and produce because of zero load switch and change, therefore, form blank at home in the grid equipment, 35～63 kilovolts of electric power system neutral point arc suppression coils are optional because of zero load switch for a long time, switch isolation switch have to be installed replace, several conditions of regulation when operation, that is: in the three-phase ground capacitance balance, neutral point voltage is very low, and when single phase ground fault possible do not have to be taken place in system, operate, however, still have just in case dangerous, this may be obvious unseen accident.

The purpose of this utility model is the on-load switch that a kind of arc suppression coil special use will be provided, and special electromagnetic operating mechanism has the performance of cut-offfing perceptual little electric current, does not produce the operation overvoltage when cut-offfing arc suppression coil.Replenish the blank in the grid equipment, improve the substation safety operational reliability.

Describe the utility model design feature, purposes and superiority thereof in detail below in conjunction with accompanying drawing.

Fig. 1 is arc suppression coil load switch body external form figure

Fig. 2 is an arc suppression coil on-load switch A-A cutaway view

Fig. 3 is installed in schematic diagram in the mechanism case for electromagnetic mechanism

Fig. 4 is arc suppression coil on-load switch mechanism and shackle rod assembling schematic diagram

Fig. 5 is an arc suppression coil on-load switch bulk shape dimensional drawing

This is a kind of 35～63 kilovolts of electric power system neutral point arc suppression coil on-load switches, and it comprises:

The arc-control device of on-load switch, insulated part, hoisting mechanism, mechanism case and CD10F type electromagnetic mechanism the invention is characterized in:

From Fig. 1 Fig. 2 as can be seen load switch body external form figure and A-A cutaway view arc-control device (1)-(11), in the outer garden groove of insulating cylinder (7) around linear medium resistance (8), resistance wire directly is 0.5 millimeter, the circle footpath is φ 6, long 4.5 meters, resistance value is 1100 Europe, the desirable safety of compact conformation, at insulating cylinder (7) inner chamber arc sheet (1)-(6) are housed, two resistance contact heads are laterally relatively being adorned in interstitial hole both sides at arc sheet (2), it is by copper-tungsten contact (2-1) conductive copper lobe (2-2), spring (2-3) and copper seat (2-4) are formed, when impacting slip, connects the conducting rod moving contact circuit with it, drawing insulating cylinder (7) outside with copper screw bolt again joins with resistance wire, the resistance wire upper end is connected to fixed contact (9), resistance is the polyphone loop when conducting rod moving contact (11) closes a floodgate, when conducting rod moving contact (11) and fixed contact (9) when separating brake cut-offs, resistance promptly becomes the shunt circuit, extinguish arcs, thereby the arc-control device of formation on-load switch.Insulated part (12) and hoisting mechanism (13) (14) are common 35 kilovolts of structures.

Fig. 3 is a CD10F type electromagnetic operating mechanism (16), be installed in the mechanism case (15), its dropout and to fasten mechanism be by connecting lever (18), four-bar linkage (19), dropout plate (20), fasten support (21) and two auxiliary switches (22) and (23), it is to adorn 180 ° and form with counter about the CD10 upper mechanism, this mechanism counter-clockwise direction action (see among Fig. 3 shown in the haircut), directly actuating connecting lever (17) interlock on-load switch connecting lever (12) (see figure 4) is closed a floodgate and separating brake, no matter two connecting levers (17) are closing a floodgate or all approximate 45 in separating brake position with (12), connecting lever in the middle of this kind kind of drive does not need, not only reduced frictional force, and it is simple in structure, relatively improved the combined floodgate ability, as just having satisfied the combined floodgate requirement with 97.5 current coils (CD10 I type), mechanism case (15) is bent into two kinds by four block plates, and (left and right sides wall is a kind of, loam cake is gone to the bottom to a kind of) identical shaped weldering system forms, easy to manufacture, case interior angle steel column is not only as operating mechanism is installed, it also is the supporting structure of load switch body, one dual-purpose, shackle rod (17)-(12) connect by the outer connecting lever (12) of mechanism case (15) top cover opening part and on-load switch, see shown in Figure 4:

Fig. 5 is on-load switch bulk shape and dimensional drawing, and Switch main body is installed in operating mechanism and mechanism case top from scheming as can be seen, operation up and down, thus it is vertically independently whole to constitute single-phase few oil, novel structure, and aesthetic in appearance, floor space is little, and is easy to maintenance.

Describe the operation principle of on-load switch below in detail further combined with accompanying drawing:

Close, sub-switching operation:

Close, sub-switching operation has two kinds, promptly a distant place electronicly close, before sub-switching operation and the mechanism case hand-power close, sub-switching operation, these two kinds of methods of operation are basic with to operate the CD10 type identical.

Arc-control device adopts two stage blow-outs

This arc-control device adopts two stage blow-out modes, and first stage of cut-offfing, (moving contact (11) was by before separately, extremely separating with resistance contact head in the fixed contact (9) again, and 1100 Europe linear resistances (8) in parallel play shunting action to help blow-out in the loop at this moment; Cut-off second stage (place, horizontal arc blow-out road that moving contact (11) and resistance contact head (2-1) are separated into the 5th arc sheet), because sealing in the loop opening current amplitude at second stage resistance (8) reduces, the phase angle difference of electric current and voltage diminishes, cut-off from inductance current, become current in resistance property and cut-off, therefore, the fracture recovery voltage diminishes when cut-offfing, blow-out is not easily dammed when cut-offfing, and does not produce switching overvoltage.

Blow-out process when cut-offfing: when on-load switch cut-offs, conducting rod moving contact (11) separates rapidly with fixed contact (9), produce electric arc between conducting rod moving contact (11) and the fixed contact (9), oil is promptly vaporized, the place forms vertical arc blow-out at arc sheet spout, conducting rod moving contact (11) separates simultaneously with fixed contact (9), resistance (8) is incorporated the electric arc loop into and is played shunting action, help arc extinction, when continuing to move to, conducting rod moving contact (11) produces electric arc between the two again after leaving resistance contact head (2-1), but seal in loop by this stage resistance (8) of ground this moment, the current amplitude that is cut-off reduces, the phase angle difference of electric current and voltage also diminishes, the inductance current that is cut-off simultaneously becomes current in resistance property, the electric current natural zero-crossing, and electric arc promptly extinguishes, yet step-down of fracture recovery voltage this moment can not produce and restrike and cut-off overvoltage.

Succeeding in developing of this on-load switch filled up blank of city net power equipment, will play a role to guaranteeing the substation safety operation.

Claims

1, a kind of arc suppression coil on-load switch, it includes to belong to 35～63 kilovolts of electric power system neutral point arc suppression coil on-load switches:

Arc-control device and insulated part and the CD10F type electromagnetic operating mechanism in mechanism case, of the present utility model being characterised in that:

In arc-control device (1)-(11), in the outer garden groove of insulating cylinder (7) around linear medium resistance (8), in arc sheet (2) interstitial hole both sides laterally to adorning resistance contact head, it is to distinguish (2-2) by contact (2-1) conductive copper, spring (2-3) and copper seat (2-4) are formed, draw insulating cylinder (7) outside with copper screw bolt and join, be connected to fixed contact on the resistance wire with resistance wire.Resistance is series loop when conducting rod moving contact (10) closes a floodgate, and when conducting rod moving contact (11) and fixed contact separate when cut-offfing, resistance becomes the shunt circuit, extinguish arcs, thus constitute the arc-control device of on-load switch;

The dropout of CD10F type electromagnetic mechanism (16) and to fasten mechanism be by connecting lever (18), four-bar linkage (19) dropout plate (20), fasten support (21) and two auxiliary switches (22) and (23), it is to adorn 180 ° and form with counter about the CD10 upper mechanism, mechanism's inhour action, directly the actuating on-load switch closes a floodgate and separating brake up and down, make this on-load switch constitute vertically overall structure independently of a single-phase few oil, mechanism case (15) is to bend two kinds of (left and right sides wall is a kind of, and loam cake is gone to the bottom to a kind of) identical shaped weldering systems by four block plates to form.