Manufacturer of 27kv Pin Insulator - 11kn AS Standard PW-22-A Pin Type Porcelain Insulator – Johnson

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Manufacturer of 27kv Pin Insulator - 11kn AS Standard PW-22-A Pin Type Porcelain Insulator – Johnson Detail:

11kn AS Standard PW-22-A Pin Type Porcelain Insulator (6)

Pin type porcelain insulators
Fig No.				1	1	2	3	6	3	4	5	5
BS Class				P-11-Y	P-15-Y	P-22-Y	P-33-Y	P-35-Y	P-44-Y	PW-15-Y	PW-22-Y	PW-33-Y
Creepage distance				240	298	432	630		864	432	673	851
Dry arcing distance				102	133	200	360	399	483	197	267	419
Main dimensions	H		mm	133	137	165	244	270	318	185	255	320
	h		mm	48	48	52.6	52.6	52.6	52.6	52.6	52.6	52.6
	D		mm	140	152	229	280	270	343	170	205	240
	d		mm	18.3	18.3	27.8	27.8	27.8	27.8	27.8	27.8	27.8
	R1		mm	13	13	19	19	14	19	16	16	16
	R2		mm	9.5	11	14.3	13	14	14.3	16	16	16
Cantilever Strength			KN	11	11	11	13	13	13	11	11	13
Min Flashover Voltage	Power frequency	Dry	kV	75	80	100	135	140	155	100	125	140
	Power frequency	Wet	kV	50	55	60	95	100	110	65	95	110
	Critical impulse	Pos	kV	115	130	160	180	215	240	150	190	210
	Critical impulse	Neg	kV	150	175	205	290	295	305	190	235	245
Withstand voltage	One min Power Frequency	Dry	kV	65	70	90	110	115	125	90	110	125
Withstand voltage	One min Power Frequency	Wet	kV	40	50	55	75	85	100	60	90	100
Withstand volt.impulse			kV	90	110	150	170	190	200	140	180	200
RIV Data	Test volt. TO ground		kV	15	15	22	30	35	44	22	30	44
RIV Data	Max RIV at 1000 KHz		uV	8000	8000	12000	16000	18000	25000	12000	16000	25000
Power Frequency Puncture Voltage			kV	150	150	200	210	230	250	150	200	210
Approx.Weight			kg	1.8	2	5	11	12.5	14	4.7	9.1	12.5

Type of pin insulator

1. Ordinary pin type insulator
Pin type common ceramic insulator porcelain parts and cast steel are glued together with cement adhesive, and the surface of the porcelain parts is coated with a layer of glaze to improve the insulation performance of the insulator. A moisture-proof agent is applied to the surface of the adhesive where the cast steel and porcelain are cemented.
The main reason why the overhead line is prone to lightning strike and dirty flashover is that the pin insulator of the line is polluted and moisture absorption in rainy days, and the insulation level is reduced, so that the pollution flashover and breakdown cause the line failure.
Needle type common ceramic insulators can continue to operate sometimes in clear weather after cracks or severe bruisings occur; But encounter light rain, fog weather, insulation on a sudden drop, causing line failure.
In addition, when the needle type common ceramic insulator has a slight crack, it is difficult for line inspectors to find the defect even with their hand telescopes, which leaves a safety hazard for the line and increases the unsafe factor of the line operation.

2. Lightning protection pin type insulator
The patented puncture structure can penetrate the insulation layer of the wire installed in the slot to form an electrical connection; The unique ignition arc fork is closely connected with the upper end of the insulator through a bolt, and the other end is a discharge end, forming a discharge gap with the grounding electrode installed on the lower end of the insulator. And an insulation cover wraps all exposed parts of the upper end of the insulator except the arc fork discharge end.
Under normal conditions, the discharge gap of the surge insulator does not operate; Only when the lightning overvoltage exceeds the specified, the gap between the arc fork and the grounding electrode can be broken down, forming a short circuit channel. The connected power frequency arc will burn on the arc fork of the line clip, releasing the overvoltage energy to protect the wire from burns.

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