Bh-0.66 Series Current Transformers

• Application: Electronic, Instrument, Position Sensor, Audio, Lighting
• Type: Current Transformer
• Phase: Single
• Operation Condition: Indoor
• Usage: Protection, Measurement
• Winding Form: Single Layer & Tightly Wound Type
• Model NO.: BH-0.66
• Insulating Medium: Insulating Paper
• Installation: Busbar Type
• Magnetic Circuit Structure: Combined Type
• Voltage Transformation Principle: Electromagnetic Type
• Transport Package: Paper Box Packaging
• Specification: standard sizes
• Trademark: SPR or OEM
• Origin: Wenzhou
• HS Code: 8504311000
• Production Capacity: 1000PCS/Week

Product Description

BH-0.66(LMK-0.66) series molded case insulation current transformers are all busbar type, and are mainly used for indoor . The BH-0.66 series CTs are used in  rated frequency is 50Hz & rated voltage 0.66KVAC circuit to check current , measure the power and relay protection.

Construction :
This series current transformer core is a ring core or a rectangular wound core, the secondary coil is insulated by a rubber case, and there is mounting hole in the bottom for users to install and use, and the middle window hole is used for Bus wire pass or soft cable winding .

Working environment :

1. Altitude: <1000m
2. Environment temperature: -5~40ºC
3. Relative humidity(RH): ≤85% (when 20ºC)
4. Installation place : There should be no contamination that seriously affects the insulation of the transformer and also without substances that causes corrosion and explosion.

Technical parameters :

1. Rated voltage :660V
2. Rated frequency :50HZ
3. Rated secondary current: 5A
4. Rated first current: 5-5000A
5. Rated output : 2.5VA,5VA,10VA,20VA,40VA;
6. Accuracy classes: 5 , 3 ,1 , 0.5 , 0.5S , 0.2 , 0.2S
7. Insulation: Primary winding to secondary winding and secondary winding to ground can withstand power frequency voltage 3KV for 1 min.

Installation tye and maintenance

1. Installation type : Horizontal and vertical installation both available 
2. When the transformer is running, it is forbidden to open the secondary winding to prevent the high voltage from causing
3. damage to the equipment and the human body.
4. For counting : the small current ratio to get the using turn number of the current transformers. The bus bar cross the window
5. hole one time , it is one turn , if bus bar cross the window hole 2 times it is 2 turns , and so on .

    Multi-times through core current ratio and through core turns

150A turn	Current ratio(A)	150/5	75/5	50/5	30/5	25/5	15/5
	Through core turns	1	2	3	5	6	10
200A turn	Current ratio(A)	200/5	100/5	50/5	40/5	20	10
	Through core turns	1	2	4	5	10	20

 

1. For monitoring ,the small current ratio (30-100/5) current transformer through core is one turn , accuracy level 3 or 5.
2. The cross-sectional area of the copper wire connected to the secondary instrument and the relay should be ≥ 2.5mm² .
3. The way to judge dotted terminals is : when the first current flows from P1 to P2, the secondary current will flow back
4. through the external circuit of S1 to S2.

Dimension Table:

Part no.	H	W	B	L1	Window size		Housing Dimension
					m	n
BH-0.66-30 I Class0.5	79	60	39	28	Figure (4)		Figure (1)
BH-0.66-30 I Class0.2	98	77	45	42	Figure (5)
BH-0.66-40 I	98	77	45	42	Figure (6)
BH-0.66-50 I	98	82	40	50	Figure (7)
BH-0.66-60 I	127	99	44	41	Figure (8)
BH-0.66-40 II	103	76	45	45	42	31	Figure (2)
BH-0.66-50 II	106	87	45	54	52	31
BH-0.66-60 II	111	99	46	42	62	31
BH-0.66-80 II	118	119	45	60	83	32
BH-0.66-100 II	122	140	50	74	102	32
BH-0.66-120 II	154	167	48	54	122	52
BH-0.66-125 II	175	178	60	68	127	61	Figure (3)
BH-0.66-60 III	139	100	45	43	62	52	Figure (2)
BH-0.66-80 III	148	118	45	61	82	52
BH-0.66-100 III	155	148	45	78	101	52
BH-0.66-125 III	180	170	45	78	125	52