GW7F-800/1100 kV disconnector

1, 800/1100 kV disconnector 2, rated current 5000A to 8000A 3, SGCC disconnector supplier 4, extra high voltage and AC

GW7F-800/1100 kV disconnector

1), the main blade adopts horizontally reverse type structure. The main blade reverse device adopts self-designed fork sliding reverse device, tiny impulse when closing blade, simple working principle with fewer parts and components, highly reliable operation.

2), in product main loop circuit and earthing loop circuit system, except movable static contact head is moving contact, the rest of conductive contact surfaces are fixed contact. All conductive contact surfaces are adopting silver-plated and tin-plated treatment. The main blade moving contact board and static contact fingers adopt copper plate of T2y type. Contact fingers adopt U-shaped external-pressured spring structure. The compressed spring is made of stainless steel, treated with isolating measures for insulation. The product contact fingers and contact head are all adopting hard-silver plated treatment. Effective measures have been taken to ensure silver-plated coating ≥ 20 μm, hardness ≥ 120 HV.

3), the product base is made of integrated steel pipe structure. Each phase adopts three columns structure, which effectively avoid damage to the disconnector caused by inconsistent ground subsidence.

  

4), the equipped earthing blade adopts single arm, straight plug-in type earthing switches, with moving contact stick into rose-shaped static contact head of the mesh structure, contact pressure produced by loop contact-finger spring which laterally fixed on static contact-head, more contact points, strong conductivity. Double four levers structure design realized switching operation of earthing blade. Heavy hammer is adopted to effectively balance the gravity of earthing blade, stable when disconnector opening and closing, easy and effortless operation.

5), rotation and transmission links: Bearing pedestal is designed with wholly-sealed structure, adopting upper and lower double sealed channel, which can effectively prevent rain and dust from corrosion to rotating bearing. The surface of bearing pedestal will be painted with sufficient wide temperature lubricant grease of which working environment range from -60°C to +120°C, in order to avoid lubrication malfunction in extremely hot and cold regions. All transmission shaft pin is made of stainless steel; transmission links adopt greaseless bearing and isolating greaseless bearing; transmission joint adopts joint bearing, which can effectively avoid shaft rust to ensure long-term and convenient operation of product.

6), mechanical interlocking between main blade and earth blade is realized by cam plate structure installed on main blade and earth blade shaft in middle phase pedestal. Interlocking device can provide strong mechanical strength, direct manipulation and reliable interlocking.

7), operating mechanism used CJTKC type turbine and worm gear motor operated mechanism, it has the following characteristics.

a, joint venture product is used and imported from Italy, a full set of ZK type cone enveloping speed reducer manufacturing technology, specializing in manufacturing and design of Level Two turbine and worm gear aluminum shell casting speed reducer, durable, noiseless and stable operation.

b, electrical components are provided by famous domestic enterprises or joint ventures to ensure the quality of electrical components.

c, all motor operated mechanism are used in stainless steel cabinet, spraying and painting special anti-corrosion coatings after surface brushed treatment, effectively protect motor operated mechanism against rust in long term operation.

d, outlet shaft adopts maze-type rainproof design, with the use of increasing convex and maze design, enhancing waterproof and dustproof performance in connector of motor operated mechanism.

8), all steel-made parts adopt stainless steel or hot dip galvanized treatment, including parts and components, of which size and dimension has been stipulated. Casted iron components are forbidden to ensure anti-corrosion performance on metal surface.

9), exposed isolating materials adopt new materials with good performance in anti-ageing, such as silicon rubber, polyformaldehyde, PTFE, etc. to ensure normal usage of isolating components without ageing in long term operation.

10), in order to meet requirement of series compensation project bypass disconnector switching high parameters current transfer, we specially installed a vacuum circuit breaker in one side of static contact-head on disconnector, at the same time, arc connector and auxiliary connector are installed. The disconnector has already firstly successfully passed 7 kV, 6300 A, 100 times opening and closing switching current test held by National High Voltage Apparatus Quality Supervision and Inspection Center. The mentioned structure has been applied for national patent, and will be applied in EHV, AC, expansion project and demonstration project by SGCC.

Technical Specifications		GW7F-800		GW7F-1100
Rated voltage kV		800		1100
The rated current A		5000		5000	8000
Disconnector	Rated peak withstand current kA	170		160	170
	Rated short-time withstand current (RMS)kA	63		63
	Rated short circuit duration s	3		3
Rated short-time power frequency withstand voltage (RMS) kV	to earth	960		1230
	across isolating point	960 (+460)		1230 (+635)
Rated lightning impulse withstand voltage (peak) kV	to earth	2100		2690
	across isolating point	2100 (+650)		2690 (+900)
Rated operating impulse withstand voltage (peak) kV	to earth	1550		1860
	across isolating point	1300 (+650)		1675 (+900)
minimum clearance in 1 min power frequency withstand voltage when ground blade closing to live part of disconnector kV		924		1100
switching electrostatic coupling induced current	induced voltage kV	12/100
	induced current A	3/100
	times	10
switching electromagnetic coupling induced current	induced voltage kV	2/70
	induced current A	80/1250
	times	10
switching busbar for current transfer	transter current A	2520	6300	2520	6300
	transfer voltage V	400	7000	400	7000
	open and close times	100	100	100	100
switching tiny current	capacitance current A	2		2
	inductance current A	1		1.5
Radio interference level μV		500		300
Mechanical life	times	6000		3000	5000
rated terminal static mechanic load N	longitudinal level	5000
	Horizontal level	4000
	Vertical force	5000
opening and closing interval for main blade and earthing blade		45±3		45±3
Note: GW7F-1100 can be applied in 800 kV, in an altitude of 3000 m.

GW7F-800/1100 kV disconnector