CN100563070C - Gas-insulated composite switchgear - Google Patents

Abstract

The present invention relates to a kind of gas isolated combination switch device of compact conformation, comprise the outlet sleeve pipe that holds the high-voltage terminal binding post; Breaker unit; The current transformer that links to each other with the breaker unit terminal, two ground connection isolated location; The isolation ground unit that is connected with other terminal of breaker unit; The entrance bushing that holds high pressure inlet wire binding post that is connected with the isolation ground unit; Two ground connection isolated locations comprise housing, high speed grounding switch and isolation earthing switch; High speed grounding switch comprises quiet moving contact, switch operating mechanism, isolation earthing switch comprises conducting bracket, moving contact is contained on the conducting bracket, be connected with operating mechanism by insulating bar, isolate fixed contact and be fixed on the high speed grounding switch fixed contact, be fixed with the ground connection fixed contact in the housing, the ground connection fixed contact is positioned on the isolation earthing switch moving contact surfaces of revolution, can improve operational reliability, realize non-maintainingly, improve the reliability of operation of power networks.

Description

Gas-insulated composite switchgear

Technical field:

The invention belongs to an outdoor three-phase AC 50Hz power transmission switchgear, in particular to a gas-insulated composite switchgear with a compact structure.

Background technique:

In order to reduce the floor area of the substation, foreign switchgear manufacturing companies have invented composite switchgear of various structural types. Power transformation equipment, for example, the known CN1205714C discloses a gas insulated switchgear, which combines terminals, bushings, isolating switches, earthing switches, circuit breakers, housings and other components together in a compact manner to realize the switchgear Optimizing the design scheme reduces the footprint of the substation. CN1205714C discloses that at least one isolating unit can be arranged at both ends of the circuit breaker, and there is only one grounding switch in the isolating unit, which only plays the role of working grounding. However, in China's power grid, in order to ensure high reliability of power grid operation, it is usually required to set up grounding switches on both sides of the moving and static contacts of the isolating switch, one of which is used for working grounding and the other is used for fast grounding. Such known gas insulator switchgear as described above, which includes an isolating unit with only one earthing function, cannot yet meet the requirements of the Chinese power system operating regulations.

Invention content:

The object of the present invention is to overcome the deficiencies in the prior art and provide a gas-insulated composite switchgear that is compact in structure and can meet the requirements of China's power system operating regulations. The known gas-insulated switchgear has a grounding switch function The isolation unit realizes the isolation unit with two grounding switch functions, one of which is used for working grounding and the other is for fast grounding.

In order to achieve the above object, the technical solution of the present invention is: comprising the outlet bushing that accommodates the high-voltage outlet terminal; a circuit breaker unit; a current transformer connected to a terminal of the circuit breaker unit in sequence, a double ground isolation unit; The isolated grounding unit connected to the other terminal of the grounding unit; the incoming bushing connected to the isolated grounding unit to accommodate the high-voltage incoming line terminal; the double grounding isolation unit includes a housing, a quick grounding switch installed in the housing, and an isolated grounding unit. switch; the fast earthing switch includes a static contact installed on the connecting opening of the casing and the outlet bushing through a pot insulator, a moving contact of the fast earthing switch arranged in the casing, and a moving contact of the fast earthing switch for controlling the connection between the casing and the casing. The operating mechanism of the fast earthing switch matched with the static contact, the isolating earthing switch includes a conductive bracket installed on the opening of the casing connected with the current transformer through a basin insulator, and one end of the moving contact of the isolating earthing switch is movably installed on the conductive On the bracket, the other end of the moving contact of the isolating grounding switch is connected to the operating mechanism of the isolating grounding switch through an insulating rod, the isolating static contact is fixed on the static contact of the quick grounding switch, and the grounding static contact of the isolating grounding switch is fixedly installed in the housing The fixed grounding contact is located on the rotating plane of the moving contact of the isolating grounding switch.

The isolated grounding unit includes an isolating switch connected to the main conductive loop and a grounding switch connected between the main conductive loop and the ground.

The isolated grounding unit includes two parallel isolating switches connected to the main conductive circuit and a grounding switch connected between the main conductive circuit and the ground.

The wire inlet bushing for accommodating the high-voltage incoming wire terminal connected to the isolated ground unit includes an incoming wire sleeve for accommodating the high-voltage incoming wire terminal.

The line-incoming bushing for accommodating the high-voltage incoming-line terminal connected to the isolation ground unit includes two two-entry bushings for accommodating the high-voltage incoming-line terminal.

A current transformer is arranged between the circuit breaker unit and the isolation ground unit.

Legs and an operation cabinet are installed below the circuit breaker unit.

A pressure relief device is provided on an opening of the housing.

The moving contact of the quick earthing switch is connected with the operating mechanism through the guide seat.

The present invention has the following positive effects: each phase of the power transmission equipment used in the open substation in the current power system, including: circuit breakers, isolating switches, working earthing switches, fast earthing switches, current transformers, etc. Combined together, connected in the form of modules, and then connected to the open bus through the inlet and outlet bushings, forming a highly combined switch system, minimizing the number of insulators, thereby reducing the probability of insulators flashover to the ground, And can achieve a large flow. The power station arranged by the composite combined electrical switchgear can save about 60% of the area compared with the conventional open substation. The number of components of this product is obviously reduced by about 30% compared with the existing GIS (gas-insulated metal-enclosed switchgear) of the same voltage level, so the reliability of operation can be greatly improved, and maintenance-free can be realized. Due to the addition of a quick grounding switch on one side of the circuit breaker, the reliability of power grid operation can be effectively improved.

Description of drawings:

Fig. 1 is a primary main wiring diagram of an embodiment of a single bus arrangement device according to the present invention.

Fig. 2 is a general layout diagram of the embodiment of Fig. 1 .

Fig. 3 is a primary main wiring diagram of an embodiment of a double bus arrangement device according to the present invention.

Fig. 4 is a general layout diagram of the embodiment of Fig. 3 .

Fig. 5 is a schematic diagram of the internal structure of the double ground isolation unit in the implementation of the present invention.

Fig. 6 is a cross-sectional view along line A-A of Fig. 5 .

Detailed ways:

As shown in Figures 1, 2, 3, 4, 5, and 6, the present invention includes an outlet bushing 1 that accommodates a high-voltage outlet terminal 1A; a circuit breaker unit 5; Transformer 4, double grounding isolation units 2, 3; isolation grounding unit connected to the other terminal of circuit breaker unit 5; incoming wire sleeve connected to the isolation grounding unit to accommodate high-voltage incoming line terminals;

The double grounding isolation unit 2, 3 includes a housing 102, a quick grounding switch 2 and an isolating grounding switch 3 installed in the housing 102,

The fast earthing switch 2 includes a static contact 104 installed on the opening of the housing 102 connected to the outlet bushing 1 through a basin insulator 103, a moving contact 102A of the quick earthing switch arranged in the housing 102, and a moving contact 102A for controlling the quick earthing switch. The quick earthing switch operating mechanism 101 in which the contact 102A cooperates with the static contact 104 in the housing 102,

The isolating and grounding switch 3 includes a conductive support 110 installed on the opening of the housing 102 connected with the current transformer 4 through a pot insulator 103. One end of the isolating and grounding switch movable contact 106 is movably installed on the conductive support 110, and the isolating and grounding switch The other end of the moving contact 106 is connected to the operating mechanism 107 of the isolating grounding switch through an insulating rod 111, the isolating static contact 105 is fixed on the static contact 104 of the quick grounding switch, and the grounding static contact is fixedly installed in the housing 102 112 , the fixed ground contact 112 is located on the rotation plane of the movable contact 106 of the isolating ground switch.

As shown in FIGS. 2 and 4 , current transformers 7 and 10 are arranged between the circuit breaker unit 5 and the isolated grounding units 8 and 11 . A bracket 6 and an operation cabinet 13 are installed below the circuit breaker unit 5 .

As shown in FIG. 5 , a pressure release device 108 is provided on an opening of the housing 102 . The moving contact 102A of the quick earthing switch is connected with the operating mechanism 101 through the guide seat 109 .

As shown in FIG. 1 , the isolated grounding unit 8 includes an isolating switch DS1 connected to the main conductive circuit and an earthing switch ES1 connected between the main conductive circuit and the ground. The figure is a schematic diagram of the primary main wiring of a typical single busbar in a substation. The components contained in the switchgear of the present invention are contained in the double dotted line box, including: tank circuit breaker CB, current transformer CT1 and CT2, disconnector DS1 and DS3, working earthing switch ES1 and ES2, fast earthing switch FES, There are six main components such as the inlet and outlet bushings BS1 and BS3. Fig. 2 shows an embodiment of Fig. 1, wherein the switchgear of the present invention at least includes a tank type circuit breaker CB unit (circuit breaker unit 5) with a metal casing, arranged horizontally in the middle of the switchgear and placed on On the bracket 6; at least one or more sets of current transformer CT units 4, 7 are located on one side or both sides of the tank circuit breaker; the double ground isolation unit 3 is arranged in the same shell and arranged between the current transformers respectively connected to the open busbar B1 of the substation through the inlet and outlet bushings 1 and 9; a density relay and a pressure release device are installed at appropriate positions in each air chamber of the primary body; the single-pole operation cabinet 13 of the switchgear is arranged on the bracket On 6, the three poles are equipped with one side of the control cabinet or the local protection measurement and control cabinet is placed in front of the partition.

As shown in FIG. 3 , the isolated grounding unit 11 includes two parallel isolation switches DS1 and DS2 connected to the main conductive circuit and an earthing switch ES1 connected between the main conductive circuit and the ground. Figure 3 shows a typical substation double bus primary main wiring. The components contained in the switchgear of the present invention are contained in the double dot dashed line box, including: tank circuit breaker CB, current transformer CT1 and CT2, disconnector DS1, DS3 and DS3, working earthing switch ES1 and ES2, quick earthing switch Six main components such as FES, inlet and outlet bushings BS1, BS2 and BS3.

As shown in FIG. 2 , the wire inlet bushing for accommodating the high-voltage incoming wire terminal connected to the isolated ground unit includes an incoming wire sleeve 9 for accommodating a high-voltage incoming wire terminal 9A.

As shown in FIG. 4 , the wire inlet bushings connected to the isolation ground unit for accommodating high voltage incoming wire terminals include two incoming wire sleeves 12 , 14 for accommodating high voltage incoming wire terminals 12A, 14A. Fig. 4 shows an embodiment of Fig. 3, wherein the switchgear of the present invention at least includes a tank type circuit breaker CB unit 5 equipped with a metal casing, which is horizontally arranged in the middle of the switchgear and placed on the bracket unit 6; At least one or more sets of current transformer CT units 4, 10 are located on one or both sides of the tank circuit breaker; double ground isolation unit 3 (with four-station combined isolation/working ground/quick ground switch DS3 , ES2, FES unit 2, 3) are in the same housing and the five-position combined isolation/grounding switch DS1, DS2, ES1 unit 11 is in the same housing, respectively arranged on one side of the current transformer and passing through the incoming and outgoing line BS1 , BS2, BS3 units 9, 12, 1 are respectively connected to the open busbars B1, B2 of the substation; a density relay and a pressure release device are installed at appropriate positions in each air chamber of the primary body; the single-pole operation cabinet 13 of the switchgear is arranged On the bracket, the three-pole and one-sided control cabinet or the local protection measurement and control cabinet are placed in front of the partition.

Fig. 5 and Fig. 6 are a kind of double-ground isolation unit provided in the switchgear of the present invention, including a housing 102, a three-position isolation/ground switch and a quick ground switch. Quick grounding switch 2 is composed of main parts such as moving contact 109, static contact 104, operating mechanism 101; Three-position isolating/grounding switch 3 is composed of moving contact 106, isolating static contact 105, grounding static contact 112, operating mechanism Main components such as moving mechanism 107 are formed. The static contact and the isolated static contact are connected together by bolts and fixed on the center conductor of the pot insulator 103 and fixed to the housing. The moving contact 109 is connected to the operating mechanism 101 by bolts to realize the opening and closing of the quick earthing switch. gate operation. One end of the moving contact 106 is rotatably connected to the conductive support 110 and fixedly connected to the central conductor of the pot insulator 113 through the conductive support, and then fixed to the housing; the other end of the moving contact 106 is connected to the operating mechanism 107 through the insulating rod 111 , the moving contact 106 realizes the opening and closing operations of the isolating switch with the isolation static contact, and realizes the opening and closing operations of the working grounding switch with the grounding static contact. In addition, a pressure release device 108 is installed on the casing to prevent the casing from being damaged due to a sudden increase in the pressure of the air chamber.

Claims (9)

1, a kind of gas isolated combination switch device comprises the outlet sleeve pipe (1) that holds high-voltage terminal binding post (1A); A breaker unit (5); The current transformer (4) that is connected with a terminal of breaker unit (5), the two ground connection isolated locations (2,3) that are connected with current transformer (4) again; The isolation ground unit that is connected with another terminal of breaker unit (5); The entrance bushing that holds high pressure inlet wire binding post that is connected with the isolation ground unit; It is characterized in that:

A, two ground connection isolated location (2,3) comprise housing (102), are installed in high speed grounding switch (2) and isolation earthing switch (3) in the housing (102),

B, high speed grounding switch (2) comprise by disc insulator (103) be installed in housing (102) be connected with outlet sleeve pipe (1) fixed contact (104) on the opening, be arranged on the high speed grounding switch moving contact (102A) in the housing (102), the high speed grounding switch operating mechanism (101) that control high speed grounding switch moving contact (102A) matches with fixed contact (104) in housing (102)

C, isolation earthing switch (3) comprises by disc insulator (103) and is installed in conducting bracket (110) on the opening that is connected with current transformer (4) of housing (102), one end of isolation earthing switch moving contact (106) is movably arranged on the conducting bracket (110), the other end of isolation earthing switch moving contact (106) is connected with isolation earthing switch operating mechanism (107) by insulating bar (111), isolating fixed contact (105) is fixed on the fixed contact (104) of high speed grounding switch, at housing (102) internal fixation ground connection fixed contact (112) is installed, ground connection fixed contact (112) is positioned on the Plane of rotation of isolation earthing switch moving contact (106).

2, gas isolated combination switch device according to claim 1 is characterized in that: isolate ground unit (8) comprise an isolating switch (DS1) that is connected on the main conductive circuit and be connected main conductive circuit and ground between an earthed switch (ES1).

3, gas isolated combination switch device according to claim 1 is characterized in that: isolate ground unit (11) and comprise the isolating switch (DS1, DS2) that is connected two parallel connections on the main conductive circuit and be connected a earthed switch (ES1) between main conductive circuit and the ground.

4, gas isolated combination switch device according to claim 1 is characterized in that: the entrance bushing that holds high pressure inlet wire binding post that is connected with the isolation ground unit is one.

5, gas isolated combination switch device according to claim 1 is characterized in that: the entrance bushing that holds high pressure inlet wire binding post that is connected with the isolation ground unit is two.

6, gas isolated combination switch device according to claim 1 is characterized in that: be provided with current transformer (7,10) between breaker unit (5) and isolation ground unit (8,11).

7, gas isolated combination switch device according to claim 1 is characterized in that: support (6) and operation cabinet (13) are installed below breaker unit (5).

8, gas isolated combination switch device according to claim 1 is characterized in that: an opening of housing (102) is provided with pressure relief device (108).

9, gas isolated combination switch device according to claim 1 is characterized in that: the moving contact of high speed grounding switch (102A) is connected with operating mechanism (101) by guide holder (109).

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