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transformer dog bone bracing

transformer dog bone bracing is widely used in transformers as great support insulation materials due to its strong strength and insulation resistance.

TEST REPORT
Description:H grade(180°) transformer dog bone bracing
No.	Item			Unit	Standard Value	Test Value	Test standard
1	bending strength		untreated	MPa	~	81	GB/T 9341-2000
			after treat		~	98.8
2	impact strength		untreated	kJ/m2	~	18	GB/T 1043-1993
			after treat		~	15
3	Insulation resistance	normal	untreated	Ω	~	3.3X1014	GB/T 10064-1988
			after treat		~	8.9X1014
		after immerse into water for 24 hours	untreated		~	2.2X108
			after treat		~	4.8X108
4	electric strength vertical		untreated	MV/m	~	14.3	GB 1408.1-1999
			after treat		~	13.2
5	electric arc endurance		untreated	s	~	188	GB/T 1411-2002
			after treat		~	189
6	dielectric constant (50Hz)		untreated	—	~	4.7	GB/T 1409-1988
			after treat		~	4.3
7	dielectric loss (50Hz)		untreated	—	~	2.2X10-2	GB/T 1409-1988
			after treat		~	1.1X10-2

Description:F grade（155°）transformer dog bone bracing.
No.	Item		Unit	Standard value	Test value	Test standard
1	appearance		—	moudle without impurity.The surface is neat,smooth, without air bladder,gash after molding.	conform to standard	JB7770-1995 clause no.5.4
2	density		g/cm3	1.75～1.95	1.81	JB7770-1995 clause no.5.5
3	water abosorption		mg	≤20	15	JB7770-1995 clause no.5.6
4	moulding shrinkage		%	≤0.15	0.1	JB7770-1995 clause no.5.7
5	thermal deformation temperature（1.8MPa）		℃	≥240	﹥240	JB7770-1995 clause no.5.8
6	impact strength		kJ/m2	≥30	81	JB7770-1995 clause no.5.10
7	bending strength		MPa	≥90	130	JB7770-1995 clause no.5.9
8	insulation resistance	normal	Ω	≥1.0X1013	2.2X1014	JB7770-1995 clause no.5.11
		after immerse into water for 24 hours		≥1.0X1012	4.9X1013
9	electrical strength （90℃oil of transformer）		MV/m	≥12.0	15.6	JB7770-1995 clause no.5.12
10	dielectric loss（1MHz）		—	≤0.015	0.014	JB7770-1995 clause no.5.13
11	dielectric constant（1MHz）		—	≤4.8	4.2	JB7770-1995 clause no.5.13
12	endurance of electric arc		s	≥180	190	JB7770-1995 clause no.5.15
13	endurance of leakage of electricity		—	≥600	600	JB7770-1995 clause no.5.15
14	flammation		grade	FV0	FV0	JB7770-1995 clause no.5.16

the picture and application of transformer bog bone as follows:

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