Indoor 3 Phases12kV 24kV 40.5kV High Voltage Isolator Switch

 Product Name:  Indoor 3 Phases12kV 24kV 40.5kV High Voltage Isolator Switch

1. Application

1) For the disconnecting switches, they are a key component of metal enclosed switchgear. These switches are suitable for service in a 12kV 50Hz AC 3-phase power system.

2) For the earthing switches, they can be accompanied with varieties of high voltage switchgears and used for earthing while maintenance of high voltage equipment.

2. Technical parameters

1).Rated Voltage: up to 12 kV

2).Rated Current: up to 4000A

3).Thermal Current for 4s (r.m.s): up to 40 kA

4).Dynamic Current (peak): up to 125kA

5).Rated Frequency: 50Hz

6).Material: porcelain

*Except for the parameters listed above, we can design as per clients’ requirements.

3. Main features

1) For the disconnecting switches:

A. Every phase conductive body for an isolating switch of series GN19-12Q is fixed on a bottom seat by two post insulators. (There are C1, C2 and C3 three gone-thru types for GN19-12C isolating switch, C1, C2-a post insulator and a bushing at one side respectively; C3-two sides are all bushings). The conductive body for every phase is composed of a contacting knife and a stationary contact. At the mid of every contacting knife is connected with a pull rod insulator that is connected with a main shaft mounted on a bottom frame by a connecting rod. The main shaft is connected to CS6-1T operating mechanism by a crank arm and connecting rod. The mechanism is connected to the isolating switch by a connecting rod supplied by customers to make the relative movement of the mechanism and the switch.

B. For GN19-12Q/1000 (1250) and GN19-12CQ/1000(1250) isolating switch, there is a magnetic locking pressing plate mounted at the contacting place. So, the attraction force between two groove contacting knives, the contacting pressure at contacting place and the dynamic and thermal stability for the switch are all enhanced while a short circuit current flows. A bottom frame assembly consists of bottom frame, main shaft and an arrester, the arrester guarantees the final position demanded while the conductive contacting knife “opening” and “closing”.

2) For the earthing switches:

A. Consisting of a bracket, a contacting knife, insulators, a closing spring and contacting seat.

B. When the process of closing, an action torque coming from the operating mechanism makes the main shaft 6 overcome a resistance torque and rotate the operating plate 4 at the direction of closing, and make a swing rod on the mobile knife 1 run over the spring dead center, and the spring releases energy to make the earthing switch accelerate closing.The tight and reliable contacting by butterfly spring 5 on the mobile knife 1 of the knife of the stationary contact 3 and contacting knife reaches the earthing demand. While opening, an action torque makes the main shaft 6 overcome a resistance torque and spring force, rotate the operating plate 4 at the opening direction, and make the swing rod on the mobile knife 1 compress the spring 2 to the dead center, and the energy storage ends for next closing.

4. Manufacturing standards: IEC62271-102:2002, GB1985-2004

5. As a key component of metal enclosed switchgears, GN-12~40.5Q indoor high-voltage isolating switch is suitable for 12kV, 24kV and 40.5kV single-phase AC 50Hz power system.

6.Features of Main Structure of GN-12~40.5Q

6.1 Every phase conductive body for an isolating switch of GN-12~40.5Q is fixed on a bottom seat by post insulators. Three phases of a GN-12~40.5Q isolating switch are mounted in parallel. The conductive body of every phase is composed of a contacting knife and a stationary contact. At the mid of every contacting knife is connected with a pull rod insulator that is connected with a main shaft mounted on a bottom frame by a connecting rod. The main shaft is connected to CS6-1T or CS6-2 operating mechanism by a crank arm and a connecting rod. The mechanism is connected to the isolating switch by a connecting rod supplied by customers to make the relative movement of the mechanism and the switch.

6.2 The conductive part mainly consists of a contacting knife and a stationary contact. The stationary contact is mounted on a post insulator. The contacting knife of every phase is composed of two pieces of groove copper plate to enlarge the heat-sinking area and enhance the mechanic strength of the contacting knife, so the thermal and dynamic stability has been enhanced. One end of the contacting knife is mounted on the stationary contact by a pin (bolt), the other end of the contacting knife is a separable connection with the stationary contact. The contacting pressure of two contacting knives is maintained by a spring.

7 Technical data for GN-12~40.5Q

 Technical Parameters Table

8 Installation and Adjustment

8.1 The earthing switch can be mounted horizontally, vertically or declinely. The switch and the operating mechanism shan’t be installed until they have been checked up and in normal. 

8.2 Fix the earthing switch on the basic seat with four bolts M12.

8.3 Phase by phase, check up and adjust the contacting condition of the contact and contacting finger. More than two thirds of the contacting area has to be guaranteed.

8.4 Check up closing condition of 3-phase contacting seat and contacting finger. The synchronism of the position for 3 phases is not more than 3 mm while just closing.

8.5 Manual closing and opening shall be carried out on the switch for 5 times respectively, making sure everything has to be ok.

Notes: Detailed technical data and outline drawing shall be provided upon request. 

  Indoor 3 Phases12kV 24kV 40.5kV High Voltage Isolator Switch

  Indoor 3 Phases12kV 24kV 40.5kV High Voltage Isolator Switch