Split Core CT Current Transformer

Split core current transformers have interleaved joint and hinge structure.
Split core CTs have a removable section, so that they can be installed without interrupting the circuit.

A split core current transformer for coupling monitoring apparatus to a current carrying conductor includes a two-piece annular core structure formed by first and second arcuate core assemblies having windings, connectable to the monitoring apparatus, wound on laminated core sections, the laminated core sections each including a plurality of flat lamination elements arranged in a stacked configuration with alternate elements having generally circular end portions which project beyond the main body portion of the arcuate core section at each end thereof defining generally circular gaps, permitting interleaving of the projecting end portions of the core sections of the two core assemblies providing an annular core structure having two interleaved joints which are held together by way of removable hinge pins which permit separation of the interleaved projecting end portions at either one of the joints to facilitate coupling to the current carrying conductor.

Parameters

Type	Primary (A)
		CL : 0.5
		VA
DP-23	100	-
	150	-
	200	-
	250	-
	300	1.5
	400	2.5
DP-58	250	1.5
	300	1.5
	400	1.5
	500	2.5
	600	2.5
	750	2.5
	800	2.5
	1000	5
DP-88	250	1.5
	300	1.5
	400	1.5
	500	2.5
	600	2.5
	750	2.5
	800	2.5
	1000	5
DP-812	500	2.5
	600	2.5
	750	2.5
	800	2.5
	1000	5
	1200	6
	1250	7.5
	1500	7.5
DP-816	1000	10
	1500	15
	2000	15
	2500	15
	3000	20
	4000	20
	5000	20

Type	A	B	C	D	E	F	G	H	I	Weight(kg)
DP-23	20	30	51	89	111	34	47	40	32	0.75
DP-58	50	80	78	114	145	32	32	32	33	0.90
DP-88	80	80	108	144	145	32	32	32	33	1.05
DP-812	80	120	108	144	185	32	32	32	33	1.25
DP-816	80	160	120	184	245	52	47	52	38	4.30

Quotation of Split Core Transformers-20081103

Defination of Split-Core CT Current Transformers

Just like the typical current transformer, the split-core current transformer measures alternating current flowing through a conductor.
The distinguishing feature of the split core current transformers is that their design permits them to be assembled around a buss barwithout disconnecting the buss bar. The typical current transformer is usually a toroidal coil, which is slipped over the end of a buss bar, hence requires disconnecting the buss bar.

"C" - cores and "U" core structures are commonly used for split-core current transformers because they are relatively easy to take apart and put back together around the buss bar. Some sort of bracketry or band clamps and holds the assembled pieces of the split-core current transformer together. Historically, this has not been as practical ( but is possible ) for toroidal coils. The bracketry is more complicated. Typically, the coil(s) must be sector wound on the toroid before cutting the core in half, whereas the 揢?and 揅?core structure of the typical split-core current transformer permit use of bobbin wound coils which can be wound independently of the core. There are now some flexible toroids, which permit the 搒plit-core?feature of installing it around a buss bar.

Split Core type Current Transformer Specifications

The electrical performance of split-core current transformers is not as good as that of the continuous toroidal coil. The 揷ircle?like ( or 搑ing?like ) shape of the toroid usually offers a shorter magnetic path length than other cores. Since the toroids are continuous, they do not add any air gap to the core structure. Split-core current transformers ( including toroidal split- cores ) add some air gap to the core structure. Consequently, the split-core current transformers will draw more magnetizing ( exciting ) current than a continuous toroidal current transformer made of the same core material ( assuming comparable size and/or weight. ). The toroidal shape provides better magnetic coupling and less leakage inductance than the 揅?and 揢?core structures commonly used in split-core current transformers.

Split-core current transformers for lower frequency applications ( power frequencies ) typically use grain oriented silicon steel or nickel alloys for the core material. There are some more exotic materials available. The material is cut into strips and then wound on an arbor ( mandrel ) to form a core. The core is then cut in half. These are known as 搕ape-wound?cores because their construction resembles a roll of tape.

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