Earthquake resistance test RISHO KOGYO CO., LTD. Earthquake resistance test Epoxy cast resin electric device

After the Great Hanshin Earthquake (1995) we have developed earthquake resistant transformers against 2G.

Earthquake resistant test results of these transformers can be seen at this page

▲ Earthquake resistant test. Click on the above picture

Location:KAJIMA technical research institute. Period :18～20,December ,1996

Item	Standard transformer	Vertical install type earthquake resistant tranformer	Horizontal install type earthquake resistant tranformer
Apperance
Structural property	Vacuum cast winding T-block with impact absorbing property Tape reinforced leg core	Vacuum cast winding T-block support of windings Enhanced earthquake resistnace with weight saving and downsizing Board reinforced core Band reinforced core Board reinforced upper and lower yoke	Vacuum cast winding T-block with impact absorbing property Horizontal installation for low center of gravity Board reinforced core Band reinforced core Board reinforced upper and lower yoke
Voltage	F6750-R6600-F6450-F6300-6150/210V
Phase	3
Rating capacity	300kVA
Frequency	60Hz		50Hz
Insulation class	F
Insulating Strength	LI 60 AC 22 kV/AC 2 kV
Standard	JEC-2200-1995/JIS C 4306 1991

Test item　/　Specimen			Standard transformer	Vertical install type earthquake resistant tranformer	Horizontal install type earthquake resistant tranformer
Earthquake wave	Resonance frequency	Z：50Gal	47.5Hz	Not measured due to very high frequency	40.7Hz
	Resonance frequency	X：50Gal	8.3Hz	9.0Hz	26.9Hz
	Kobe Marine Observatory X：873Gal / Y：619Gal / Z：344Gal		◯	◯	◯
	El Centro (Adjusted)	X：351Gal Z：221Gal	◯	◯	◯
		X：1142Gal Z： 640Gal	◯	◯	◯
		X：2249Gal Z：1290Gal	× Frame deformation	◯	◯
	Sudden application of sin wave of resonance frequency Resonance frequency / Amplification ratio	Z：150Gal	◯ 47.5Hz/6.4 times	Not measured due to high frequency	◯ 40.7Hz/9.9 times
		Z：500Gal	◯ 47.5Hz/4.3 times	Not measured due tovery high frequency	◯ 40.7Hz/9.0 times
		X：300Gal	◯ 8.3Hz/5.3 times	◯ 9.0Hz/3.5 times	◯ 26.9Hz/5.6 times
		X：1000Gal	× 5.5Hz/3.6 times Frame deformation	◯ 5.8Hz/4.5 times	◯ 22.0Hz/4.2 times
		X：1500Gal	Not applied	▲ 4.9Hz/2.4 times Dislocation of support rod	◯ 18.0Hz/3.7 times
Evaluation result			1.5G resistant	2G resistant	2G resistant

○=OK　　▲=Parts trouble　×=NG

Earthquake wave measured at EL Centro ,California ,USA in 1940 . Maximum acceleration: X:NS=341.7 Gal / Z:UD=206.3 Gal.

Earthquake wave measured at Kobe Marine Observatory in Jan 1995. Maximum acceleration: X:NS=821Gal / Y:WE=619Gal / Z:UD=206Gal.

Sin wave of resonance frequency is applied to the specimen with predefined acceleration