High-power Power Transformer Core

Product Features:

Zhili high-power instrument transformer core which is made by self-produced 1K107 DI nanocrystalline strips has high Saturation magnetic induction, 1.25T Bs, high magnetic permeability, good product stability and can work under -55—130℃ for a long time. At the same time, the outside of our iron cores are packed in plastic box and stainless steel box with adhesive to protect magnetic core (as shown in the following figure):

 

Characteristics of iron core:

. High magnetic permeability -- reduces the measuring error of current transformer?
. High Saturation magnetic induction -- smaller and lighter than current transformer of silicon-steel sheet
. Superior temperature stability -- works under -55--130°C for a long time
. In the condition of same dimension and performance of magnetic core, iron core is lighter and cheaper than permalloy.

Product Application

. Measurement of transformer substation and protection of current transformer core
. Precise current transformers with 0.2, 0.2s and 0.1 precision level
. Low-voltage, medium-voltage and high-voltage switchgear
. Power transmission and power distribution equipment
Electric transformer is a special transformer to measure the current, power and electric energy in electric transmission and distribution circuit. According to the requirement on the measuring precision level of instrument transformer, different soft magnetic materials can be used as core materials. If the magnetic permeability of core is higher, the measuring error of instrument transformer will be smaller and the precision will be higher. At present, the iron-core material used most is cold-rolled silicon-steel sheet and the next is permalloy and nanocrystalline alloy. In recent years, the demand for instrument transformer with high-precision level (such as 0.2, 0.2S and 0.5S) has been increasing rapidly. When small ratio of transformation, low ampere turns are required or the dimension of iron core is restricted due to the requirement of volume, cold-rolled silicon-steel sheet can't meet the required measuring precision more often than not. Although permalloy core with high magnetic permeability can meet the requirement of precision, its price is high. While nanocrystalline core can not only meet the requirement of precision, but the price is lower than permalloy. Therefore, the domestic demand for nanocrystalline current transformer core for measurement is rapidly increased.
   















PASS 開關裝置 PASS switching device      
低功率CT Low power CT    
智能綜合控制器 Intelligent comprehensive controller   
PASS開關匯控箱 PASS breaker general control box       
電纜或光纜 Electric cable or optical cable

Performance index:

Comparison on the performance of Fe-based nanocrystalline core, permalloy core and silicon-steel sheet core

Basic magnetic parameters	Nanocrystalline core	Permalloy core	Silicon-steel sheet core
Saturation magnetic induction (T)	1.25	0.76	2.03
Initial magnetic permeability (Gs/Oe)	40,000-80,000	50,000-80,000	1,000
Maximum magnetic permeability (Gs/Oe)	> 200,000	> 200,000	40,000
Density (g/cm3)	7.2	8.75	7.65
Curie temperature (℃)	570	400	740
Thickness of strip (mm)	0.025-0.035	0.15	0.3
Lamination factor	> 0.70	0.9	0.95

Specification and model of common iron core

Product model	Dimension of iron core (mm)			Dimension of protective box (mm)			Sectional area (cm2)	Length of magnetic path (cm)	Mass (g)
	OD	ID	HT	OD	ID	HT
TC-704025	70	40	25	72	37	28	2.81	17.28	352
TC-805020	80	50	20	82	456	23	2.25	20.42	333
TC-19513030	195	130	30	200	125	40	7.3125	51.025	2686
TC-22012030	220	120	30	225	115	40	11.25	53.38	4324
TC-24018025	240	180	25	245	175	30	5.625	65.94	2671
TC-24517525	245	175	25	250	170	30	6.5625	65.94	3116
TC-29520530	295	205	30	300	200	40	10.125	78.5	5723
TC-27519040	275	190	40	280	185	45	12.75	73.005	6702
TC-40530535	405	305	35	410	300	40	13.125	111.47	10534
TC-41030035	410	305	35	415	295	40	14.4375	111.47	11587
TC-45537525	455	375	25	460	370	35	7.5	130.31	7037
TC-52037555	520	375	55	525	370	65	29.9063	140.52	30256
TC-57042530	570	425	30	575	420	40	16.3125	156.22	18347
TC-95065050	950	650	50	960	640	60	61.5	251.2	102494

*can be prepared according to the specifications and performances required by customers

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