Stay Insulator Induction

The insulating material of strain insulators is porcelain, which is sound, thoroughly vitrified, and free from defects and blemishes which might adversely affect the life of the insulator. The exposed parts of the porcelain are smoothly glazed and brown in color.

The strain insulator is free from stresses due to expansion and contraction in any part which may lead to deterioration. The holes in the insulator are smoothly radiused with as large a radius as practicable to present an even bearing surface to the stay-strand loop.

33kv stay insulator

1. Technical datasheet

The porcelain insulators are strain type suitable for stay wire, there are MV and LV stay insulators in the distribution line. Tests are based on ANSI or IEC standards.

ANSI standard

Strain insulator

Fig. No.			1			2
ANSI Class			54-1	54-2	54-3	54-4
Nominal System Voltage/kV			2.2	4.4	6.6	6.6
Main Dimensions/in		H	3-1/2	4-1/4	5-1/2	6-3/4
		h	1-3/4	2-1/4	3-1/8	2-5/8
		h1	2-1/2Max	3 Max	4-1/16	4-1/2
		D	5/8	2-7/8	3-3/8	3-1/2
		d	1-3/4	2-1/8	2-3/8	2-3/8
		d1	2-1/2	7/8	1	1
Tension Strength/Ib(KN)			10,000(44)	12,000(53)	20,000(89)	20,000(89)
Average Flashover Voltage/kV	Low-frequency(Dry)		25	30	35	40
Average Flashover Voltage/kV	Low-frequency(Wet)		12	15	18	23
Leakage Distance/in(mm)			1-5/8(41)	1-7/8(48)	2-1/4(57)	3(76)
Net Weight/Ib(kg)			0.76(0.35)	1.5(0.68)	2.9(1.3)	4.1(1.9)

IEC standard

Guy insulator

Fig. No.		1	2	2	2
Class		GY1	GY2	GY3	GY4
Dimensions, mm	H	90	146	216	280
	h	48	73	89	89
	h1	60	99	133	165
	D	68	73	115	115
	d	40	44	67	67
	d1	16	22	38	38
Power Frequency Withstand Voltage (Wet), kV		10	15	20	30
Tension Failing Load, KN		27	71	222	222
Net Weight, Each, Approx., kg		0.6	1.1	4.3	5.7

2. Manufacture process

33kv stay insulator

Strain insulator

3. Guy insulator application

Guy insulator

Porcelain stay insulators are used on overhead power distribution lines operating at a nominal voltage of up to 33kV.
The stay insulators are manufactured by wet process and are designed for insulation of stays to reduce the risk of dangerous potential gradients at ground level and in the case of stays on earthed structures, to prevent electrolytic corrosion of stay rods.