Product Overview
The GW5-126/2000A outdoor double-column V-type high-voltage disconnector is suitable for 110kV three-phase AC 50 Hz power systems, for opening and closing circuits under no-load conditions and for electrical isolation of equipment under maintenance from live lines, rated voltage 126kV, rated current 2000A.The product is of double-column centre-break middle-opening type, and earthing switches can be fitted on one or both sides. The disconnector with 90° transmission uses a CS17 manual operating mechanism for three-pole linked operation; the disconnector with 180° transmission uses a CJ6 motorized operating mechanism or a CS17G manual operating mechanism for three-pole linked operation; the earthing switch uses a CS17G manual operating mechanism for three-pole linked operation. The disconnector is of double-column V-shaped horizontal-opening type; each single pole consists of the base, post insulators, outgoing terminal and contacts, with two supports at an included angle of 50° and two post insulators mounted at an angle on bearings at both ends of the base, perpendicular to the base. The main conducting parts are mounted above the two post insulators and rotate about 90° with them. The copper braided flexible connections in the outgoing terminal are fastened to the conductive tube and terminal plate, the latter being for user line connection. The contact fingers of the intermediate contact part are assembled in pairs and are of self-supported plug-in type, reducing the wear between contacts and fingers during opening and closing and extending service life. When the disconnector is fitted with earthing switches, the interlock between the main circuit and the earthing switch is ensured by the sector plate and arc plate on the base: when the main circuit is closed the earthing switch cannot be closed, and when the earthing switch is closed the main circuit cannot be closed.
Product Features
The disconnector adopts a double-column center-break, plug-in contact structure with self-cleaning contact capability, improving contact reliability; the contact fingers are made of new materials with high strength, high conductivity and high elasticity. The fingers clamp the contacts by their own elasticity, avoiding the vicious circle of reduced clamping force, increased contact resistance and aggravated contact heating caused by spring rusting and annealing; the rotating parts are designed for long-period reliable operation. The rotating seat is sealed so that moisture, dust and harmful gases cannot enter, keeping the bearings and MoS2 lithium grease in a good environment - the bearings never rust, the grease never leaks or dries out, and the operating torque does not increase after long-term operation. Stainless steel pins with oil-free self-lubricating bearings are used; steel parts are hot-dip galvanized, ensuring flexible, light, reliable operation and freedom from rust.
Improved-disconnector Design Notes
Hot-dip galvanizing is applied for corrosion protection; rotating parts that cannot be guaranteed by hot-dip galvanizing generally use stainless steel, fasteners below M8 are stainless steel and the rest are hot-dip galvanized. The conductive part is of copper-tube flexible-connection type; the intermediate contacts are “handshake” self-supported contact fingers with externally pressed springs carrying no current - the disconnector has only one central contact point while the rest are fixed flexible connections. The new contact structure fixes one end of the contact strips to the contact seat; the contact pressure is produced by strip deformation and springs, changing the sliding contact at the finger ends into fixed contact and improving conduction reliability; the finger springs are externally mounted to avoid spring shunting; magnetic lock plates are added to improve dynamic and thermal stability. The rotating parts are fitted with self-lubricating sleeves requiring no grease. The main terminals are flat type. For 630 A the conductive parts are tin-plated; for 1250 A-4000 A they are silver-plated. The upper and lower caps of the porcelain insulators are hot-dip galvanized for rust prevention; insulators with different creepage distances can be selected per the pollution level of the service area; positive tolerance is applied in manufacturing and the creepage distance is designed above the standard value. The post insulators have high strength density and are stable and reliable; the formula uses high-strength materials to reduce strength dispersion and increase tensile strength, and a large strength margin is reserved in the structural design to ensure stable and reliable operation.
Main Technical Parameters
| No. | Item | Unit | Parameter (GW5-126/2000) |
|---|---|---|---|
| 01 | Rated voltage | kV | 126 |
| 02 | 1-min power-frequency withstand voltage | to earth kV | 230 |
| across break kV | 245 | ||
| 03 | Lightning impulse withstand voltage (peak) | to earth kV | 550 |
| across break kV | 630 | ||
| 04 | Rated frequency | Hz | 50 |
| 05 | Rated current | A | 2000 (126 kV, 2500/3150A high-current versions also available in the same series) |
| 06 | Rated short-time withstand current | kA | 40 (for 2000A rating) |
| 07 | Rated peak withstand current | kA | 100 |
| 08 | Rated short-circuit duration main blade/earthing blade | s | 4/2 |
| 09 | Rated terminal mechanical load | Horizontal longitudinal N | 1000 |
| Horizontal transverse N | 750 | ||
| Vertical force N | 1000 | ||
| 10 | Creepage distance | mm | 3150 3906 |
| 11 | Mechanical life | operations | 2000 |
| 12 | Manual operating mechanism | Model | CS17, CS17G |
| Control circuit voltage | AC220, DC110, DC220 | ||
| 13 | Motorized operating mechanism | Model / motor voltage | CJ6 / AC380 |
| Opening/closing time | 6±1 s | ||
| 14 | Product weight | Without earthing kg | 800 |
| Single earthing kg | 900 | ||
| Double earthing kg | 1000 |
Outline & Installation Dimensions
GW5 series outdoor HV disconnector (50° V-type structure) photos and structure diagrams
Structure: the switch is of 50° V-type structure, mainly consisting of the base, post insulators, main conducting part and earthing part; main components: 1 & 4 terminal seats, 2 main contacts, 3 main contact fingers, 5 earthing fingers, 6 post insulators, 7 limit plates, 8 earthing blades. The main contacts of the GW5-126/2000A outdoor double-column V-type high-voltage disconnector cooperate with the earthing contact fingers for reliable opening and closing of the main blade and earthing blade.
Service Conditions
① Ambient temperature: upper limit +40℃, lower limit -30℃ (special order for frigid regions); ② Altitude: not exceeding 1000 m (above 1000 m the insulation level may be corrected per GB311.1); ③ Wind speed: not more than 35 m/s; ④ Ice thickness: not more than 10 mm; ⑤ Seismic intensity: not exceeding degree 8; ⑥ The site shall be free of flammable, explosive, heavy dust, chemical corrosion and violent vibration. The GW5-126/2000A outdoor double-column V-type high-voltage disconnector maintains flexible operation and reliable isolation for a long time under the above normal service conditions.
Related Products
High-voltage disconnectors of the same series and other types available:
- GW5-40.5/630A outdoor double-column V-type high-voltage disconnector
- GW5-72.5/1250A outdoor double-column V-type high-voltage disconnector
- GW5-126/2000A outdoor double-column V-type high-voltage disconnector
- GW5-126/3150A high-current outdoor high-voltage disconnector
- GW4-40.5/630A outdoor double-column horizontal-opening high-voltage disconnector
- GW4-126/3150A high-current outdoor high-voltage disconnector
- GW9-12 single-phase outdoor high-voltage disconnector
- GW13 series neutral-point outdoor high-voltage disconnector
