ZCT225 Lead Wire Type Zero Phase Current Transformer phase transformation

Electrical Specification

(Customized is available)

Rated Current	225A
DC Resistance at 25℃	11±3Ω
Dielectric Withstanding     Voltage(Hi-pot)	2500Vrms
Output Voltage Vo	25-30mV

The zero-sequence transformer mainly has the following applications:

1. The outlet of the low-voltage side of the transformer of the low-voltage 400V system.
2. Part of the feeder and motor circuit of the low-voltage 400V system.
3. Cable outlet of medium voltage ungrounded system or small resistance grounded system.
4. High-voltage direct grounding system transformer high-voltage neutral point bushing and neutral point grounding device.
5. The main functions of various forms of zero-sequence transformers:
6. The zero-sequence current transformer on the low-voltage side of the low-voltage 400V system transformer has two main functions: First, the operator detects the unbalanced current of the transformer during normal operation, which is convenient for operation adjustment. The second is to connect the zero-sequence current to the protection device of the low-voltage transformer, which is used for zero-sequence current protection on the low-voltage side of the transformer as a backup protection for the low-voltage busbar and feeder.
7. The zero-sequence current transformers of some feeders and motor circuits of the low-voltage 400V system are mainly used to connect the zero-sequence current to the protection device for single-phase grounding zero-sequence current protection. It avoids the situation that the overcurrent protection of the loop makes the protection leapfrog action when the single-phase grounding short circuit does not meet the requirements of sensitivity.
8. The role of the zero-sequence current transformer in the medium voltage system is mainly divided into two types: the zero-sequence current transformer of the small-current grounding system is mainly used to collect the change of the zero-sequence current of the loop when the system is single-phase grounded, and is mostly used for the grounding fault line selection device ; The secondary current access protection device of the zero-sequence current transformer of the small resistance grounding system is used for single-phase grounding current protection. Protection acts on tripping.
9. The neutral point zero-sequence current transformer of the high-voltage direct grounding system is mainly used for the zero-sequence current protection of the high-voltage side of the transformer; the zero-sequence current transformer of the transformer neutral point grounding device is mainly used for the gap zero-sequence current protection.

Item	Rated Current(A)	Output Voltage Vo(mv)	Test Conditions	Over Leakage Characterstics	Temperature Characteristics -35~80℃	Dimensions (mm)
Click PN For Details						ID	OD	HT
ZCT201	30	4-5.1	lin=10mA RL=510	-10%~0%	10%Max	5.9	16	6.5
ZCT202	30	5.1-6	lin=8mA RL=750	-10%~0%	10%Max	5.8	15.2	6.1
ZCT203	50	17-21	lin=22.5mA RL=1k	-10%~0%	10%Max	9.2	21	7.3
ZCT204	30	12-15	lin=22.5mA RL=1k	-10%~0%	10%Max	9.8	20.6	6.5
ZCT205	30	12.5-15.5	lin=8mA RL=4.7k	-10%~0%	10%Max	9.3	21.3	7.2
ZCT206	50	17-21	lin=22.5mA RL=1k	-10%~0%	10%Max	12.3	26	10
ZCT207	30	7.5-8.5	lin=25mA RL=1k	-10%~0%	10%Max	15.4	29.8	10
ZCT208	60	10.2-12.5	lin=20mA RL=680	-10%~0%	10%Max	7.2	19.4	7.7
ZCT209	50	8-11.2	lin=11.25mA RL=1k	-10%~0%	10%Max	7	17.2	7
ZCT210	50	8-11.2	lin=11.25mA RL=1k	-10%~0%	10%Max	6.8	16.9	7.9
ZCT211	50	8-11.2	lin=11.25mA RL=1k	-10%~0%	10%Max	10.6	25.4	8
ZCT212	60	10.2-12.5	lin=20mA RL=680	-10%~0%	10%Max	11	23.5	8
ZCT213	60	≥300	lin=25mA RL=1k	-10%~0%	10%Max	9.4	23.8	12.7
ZCT218	60	10.2--12.5	lin=25mA RL=680	-10%~0%	10%Max	7.5	18.9	7.6
ZCT220	60	≥300	lin=25mA RL=47k	-10%~0%	10%Max	10.1	24	11.5
ZCT225	60	≥300	lin=25mA RL=47k	-10%~0%	10%Max	10.9	25.5	9
ZCT401	100	17-21	lin=22.5mA RL=1k	-10%~0%	10%Max	15	29.2	10
ZCT402	100	6.3-7.5	lin=20mA RL=370	-10%~0%	10%Max	17.5	35.9	8.8
ZCT403	250	17-21	lin=22.5mA,RL=1k	-10%~0%	10%Max	29	51	12
ZCT404	250	17-21	lin=22.5mA,RL=1k	-10%~0%	10%Max	32	55.6	12
ZCT405	250	17-21	lin=22.5mA,RL=1k	-10%~0%	10%Max	42	80*69	20
ZCT406	630	17-21	lin=25mA,RL=1k	-10%~0%	10%Max	51.3	84	26
ZCT407	800	17-21	lin=22.5mA,RL=1k	-10%~0%	10%Max	51	96*89	23
ZCT408	100	125-150	lin=500mA,RL=150	-10%~0%	10%Max	19	36	11.5
ZCT409	225	125-150	lin=500mA,RL=150	-10%~0%	10%Max	24	42	12
ZCT410	400	125-150	lin=500mA,RL=150	-10%~0%	10%Max	43	90*74	16
ZCT411	800	120-151	lin=500mA,RL=150	-10%~0%	10%Max	53	96*89	23