Product details

Overview:

The HK-12/C common-tank gas-filled switchgear is a metal enclosed switchgear with SF6 gas insulation. It can be composed of modules such as load switch units, load switch-fuse combination units, vacuum circuit breaker units, and busbar incoming units. Utilizing a range of technologies and materials, it exhibits excellent electrical and mechanical properties, is minimally affected by environmental and climatic factors, boasts a compact size, is easy to install, convenient to operate, requires no maintenance, and offers flexible combination options. Its clear and intuitive design ensures simple and direct operation. The feeder wiring capacity is large, making it suitable for various wiring systems.  

Unit definition: Product features: Operational safety

parameter

Rated voltage Kv   12/24

Power frequency withstand voltage KV 42/56

Lightning impulse withstand voltage Kv 95/125

Rated current A 630/630 1250/800

Rated transfer current A 1750/1400

Closed-loop breaking current A 630/630

Cable charging breaking current A 135/135

5% rated active load breaking current A 31.5/31.5

Current interruption for power connection fault A 200/150

The breaking current of cable charging during power connection failure is A 115/87

Short-circuit breaking current KA (Note 2) 20/16 25/20

Making capacity KA 63/52.5 Note 2) 50/40 63/50

Short-time withstand current for 2 seconds, KA 25/25

Short-time withstand current 3s KA 20/20 20/16 25/20

Mechanical lifespan (times) 5000 3000 10000 2000 5000 5000

Product Features

◆ Spring energy storage operating mechanism, operable manually or electrically

◆ The panel analog line diagram provides indication of switch positions

◆ The cabinet body is made of galvanized sheet, with its surface subjected to electrostatic spraying, enhancing its corrosion resistance

◆ Monitoring the economic efficiency of the safe pressure range of SF6 gas within the box body using a pressure gauge

◆ Maintenance-free

◆ Highly reliable

◆ Long service life

Flexible design scheme:

◆ Multiple wire entry methods, allowing for left, right, top, or forward wire entry

◆ Multiple combination methods, allowing arbitrary combinations between units

◆ By using insulated busbars, it is possible to achieve front-to-back or side-to-side cabinet parallelization

◆ Flexible design scheme

Widely used:

◆ The feed-out line has a large capacity and occupies a small area, making it suitable for various application needs. Design description:

The GA series ring main switchgear is installed on a galvanized sheet frame, with the switch unit housed within an SF6 gas tank made of corrosion-resistant and non-magnetic 3mm thick stainless steel plate. The SF6 gas tank is a "sealed pressure system" that can operate for 20 years under normal working conditions. The pressure of SF6 gas during normal operation ranges from 0.15 to 0.4 bar. The gas tank is equipped with a pressure release device to ensure that gas can be released from the bottom or rear when the pressure becomes too high.

Anatomy of internal structure:

Switch unit:

The load switch adopts a coaxial rotating double-break design, allowing functional operation through a single operating hole in conjunction with a sliding plate. Therefore, the switch can only be in one of three states at any given time: "closed, open, or grounded," completely eliminating the risk of misoperation.

Operating mechanism:

The operating mechanism of the switch is installed at the front outside the air box, which has undergone process treatment to prevent rust and corrosion, facilitating manual operation and maintenance, and making electric operation easily achievable.

A cable chamber that truly meets the demand

The cable connection chamber boasts ample space and features a standard sleeve design, ensuring compatibility with European-style standard cable plugs. Under normal circumstances, each load switch unit can accommodate 1 to 3 outgoing lines, while the design version can accommodate 4 to 6 outgoing lines. The vacuum circuit breaker unit can accommodate 1 to 2 outgoing lines.

Pressure relief device:

The pressure relief device is separated from the cable chamber by a metal plate. If the pressure inside the gas tank becomes too high, the explosion-proof membrane inside the device will rupture to release the pressure.

Cable connection:

Standard universal specification sleeves (compliant with DIN47636 standard or American standard) are selected to facilitate users in choosing corresponding cable accessories. T-shaped front and rear cable plugs are used for connection, with a European-style bolt step-by-step fastening structure. The connection between the front plug and the sleeve utilizes M16 bolts.

Lightning arrester connection:

The load switch unit can be equipped with a T-shaped rear-plug-in silicone rubber fully sealed metal zinc oxide arrester. When there are multiple cable circuits and insufficient space, a π-shaped rear-plug-in arrester can be used. Design Description:

Interlocking mechanism:

The interlocking mechanism inside the switch can effectively prevent misoperations and ensure that the cable chamber can only be accessed when the switch is in the "grounded" state. An external lock can be added to lock it in different states.

Auxiliary switch:

Load switches and grounding switches can be equipped with auxiliary switches that can simultaneously reflect the position status of the switches as needed.

Fuse: replacement is direct and convenient. The fuse is housed within an insulating tube, which is situated inside the metal gas tank of SF6.