With the development of the ultra-high voltage AC and DC of power grid, the composite insulator, with its unique characteristic, is widely used in the power grid. Compared with the traditional porcelain insulator, composite insulator has the advantage of excellent seismic and wet dirt resistance, high strength, light weight, easy operation and maintenance, invulnerability to breakage and its umbrella skirt an d shed can be repaired. Especially in the field of ultra-high voltage, the cost performance of composite insulator is particularly prominent.

Since the beginning of 1998, Pinggao has been engaged in the development of composite insulator, now has the mature development technology of 12 kV ~ 1100 kV ac and dc hollow, pillar composite insulator and the whole series of ac and dc voltage grade line insulator products. The main products are hollow composite insulator, pillar composite insulator, composite insulator for arcing chamber, optical fiber composite insulator, composite sleeve, wall bushing, can meet the requirements of the AC/DC power station of each voltage grade. At present, more than 60000 composite insulator which were developed by Pinggao are operating safely in various area at home and abroad.

110kV～1100 kV hollow composite insulator

1. The structure of hollow composite insulator

Hollow composite insulator as a main component of composite bushing, play a role of the casing mechanical load, the electrical insulation.Hollow composite insulator is composed of silicon rubber umbrella cover, glass fiber winding tubes, end metal flange.

The structure of hollow composite insulator with the voltage grade of 550KV and above

2.Technical parameters of hollow composite insulator

Table1: technical parameters of hollow composite insulator of 126kV～1100kV

No.	Items	Unit	Technical parameters
No.	Items	Unit	126 kV	252 kV	363 kV	550kV	800kV	1100kV
1	Rated voltage	kV	126	252	363	550	800	1100
2	Separate bending load test	kN	10	10	10	15	25	26
3	Destroy bending load test	kN	≥20	≥20	≥20	≥25	≥50	≥52
4	Separate internal pressure test	MPa	2	2	2	1.6	1.6	1.6
5	Destroy internal pressure test	MPa	≥3.5	≥3.2	≥4.0	≥4.0	≥4.0	≥3.2
6	Pollution class	/	Ⅳ	Ⅳ	Ⅳ	Ⅳ	Ⅳ	Ⅳ

l parameters of hollow composite insulator of 126kV～1100kV

3.Application of hollow composite insulator

The hollow composite insulator produced by Pinggao is mainly used in tank circuit breaker, GIS, mutual inductor, air transformer, reactor, filter, lightning arrester, wall bushing, cable terminals and other kinds of electrical appliances.

4. The type testing and identification reports of hollow composite insulator

1)Type testig

The hollow composite insulator with more than 550KV voltage grade, developed by Pinggao independently, passed through all typing tests respectively in August 2006 and March 2008, and obtained the type test report.

The type test report of hollow composite insulator withthe voltage grade of 550KV and above

2)Product identification

The hollow composite insulator with the voltage grade of 550KV and more which is developed independently by Pinggao passed through the national identification in June 2009.

Appraisal certificate of hollow composite insulator with voltage grade of 550KV and above

Composite bushing of voltage grade with 420KV and above

1.Structure of composite bushing

The 420kv and the above voltage grade of composite bushing with SF6 gas as its insulating medium, composed of hollow composite insulator, conductive rod, shielding system, grading ring and other components. Including 800 kv and 1100 kv composite bushing is double block structure.

The structure of composite bushing with the voltage grade 420KV and the above

2. Technical parameters of composite bushing

Table 2: Technical parameters of 420kV～1100kV composite bushing

No.	Items	Unit	Technical parameters
No.	Items	Unit	126 kV	252 kV	363 kV	550kV	800kV	1100kV
1	Rated voltage	kV	126	252	363	550	800	1100
2	Separate bending load test	kN	10	10	10	15	25	26
3	Destroy bending load test	kN	≥20	≥20	≥20	≥25	≥50	≥52
4	Separate internal pressure test	MPa	2	2	2	1.6	1.6	1.6
5	Destroy internal pressure test	MPa	≥3.5	≥3.2	≥4.0	≥4.0	≥4.0	≥3.2
6	Pollution class	/	Ⅳ	Ⅳ	Ⅳ	Ⅳ	Ⅳ	Ⅳ

2.Technical parameters of hollow composite insulator

Table1: technical parameters of hollow composite insulator of 126kV～1100kV

3.Application of hollow composite insulator

4. The type testing and identification reports of hollow composite insulator

1)Type testig

The type test report of hollow composite insulator withthe voltage grade of 550KV and above

2)Product identification

The hollow composite insulator with the voltage grade of 550KV and more which is developed independently by Pinggao passed through the national identification in June 2009.

Appraisal certificate of hollow composite insulator with voltage grade of 550KV and above

Composite bushing of voltage grade with 420KV and above

1.Structure of composite bushing

The structure of composite bushing with the voltage grade 420KV and the above

2. Technical parameters of composite bushing

Table 2: Technical parameters of 420kV～1100kV composite bushing

No.	Items	Unit	420kV	550kV	800kV	1100kV
1	Rated voltage	kV	420	550	800	1100
2	Rated current	A	4000	5000	6300	6300
3	Rated short-time power frequency withstand voltage(1 min effective values)	kV	650	740	960(1094)	1100
4	Rated lightning impulse withstand voltage(1.2/50us peak)	kV	1425	1675	2100(2404)	2400
5	Rated operating impulse withstand voltage(full-wave 250/2500us)	kV	1050	1300	1550(1682)	1800
6	Creepage distance	mm	≥16500	≥20460	≥ 29760	≥37510
7	Cantilever load	N	10000	6000	10000	5000
8	SF6 gas pressure Rated/lowest/highest	MPa	0.5/0.4/0.5	0.5/0.4/0.6		0.45/0.4/0.6
9	SF6 yearly gas leakage rate	----	≤0.1%	≤0.1%	≤0.3%	≤0.3%
10	Pollution class		Ⅳ	Ⅳ	Ⅳ	Ⅳ
11	Magnitude of partial discharge	PC	1.5 times the phase voltages is not more than 10 PC. 1.2 times the phase voltages is not more than 3 PCS.	1.5 times the phase voltages is not more than 10 PC. 1.2 times the phase voltages is not more than 3 PCS.	1.5 times the phase voltages is not more than 10 PC. 1.2 times the phase voltages is not more than 5 PCS.	1.5 times the phase voltages is not more than 10 PC. 1.2 times the phase voltages is not more than 5 PCS.

3.The type testing and identification reports of composite bushing

1)Typing test

The type test report of composite bushing withthe voltage grade of 420KV and above

2)Identification report

550kV, 800kV and 1100kV composite bushing which is developed by Pinggao independently passed through the national identification in January 2014. Including 800 kv, 1100 kv composite bushing international leading technology level, 550 kv composite bushing international advanced technology level.

Identification report of composite bushing with the voltage grade of 420kV and the above

550 kv composite bushing (Zhengzhou station of DC from south of Hami to Zhengzhou)

1100 kv composite bushing (uhv test station)