ZCT520 Pin type zero phase transformer current calculation
Electrical Specification
(Customized is available)
| Rated Current | 50A |
| DC Resistance at 25℃ | 54±6Ω |
| Dielectric Withstanding Voltage(Hi-pot) | 2500Vrms |
| Output Voltage Vo | 20-24mV |
Working principle of zero sequence current transformer
The basic principle of zero-sequence current protection is based on Kirchhoff’s current law: the algebraic sum of the complex current flowing into any node in the circuit is equal to zero.
When the line and electrical equipment are normal, the vector sum of each phase current is equal to zero. Therefore, the secondary winding of the zero sequence current transformer has no signal output, and the actuator does not operate. When the ground fault occurs, the vector sum of each phase current is not zero.
The fault current causes magnetic flux in the ring core of the zero-sequence current transformer. The induced voltage on the secondary side of the zero-sequence current transformer causes the actuator to move and drive Trip device to switch the power supply network to achieve the purpose of ground fault 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 | |||||
| ZCT501 | 30 | 8-14 | lin=30mA,RL=1kΩ¸ | -10%~0% | 10%Max | 6.8 | 17.3 | 7 |
| ZCT502 | 30 | 6.3-7.3 | lin=22.5mA RL=1kΩ¸ | -10%~0% | 10%Max | 6.8 | 18.2 | 7.2 |
| ZCT503 | 20 | 7.5-10.5 | lin=11.25mA RL=1kΩ¸ | -10%~0% | 10%Max | 5.5 | 15.4 | 6 |
| ZCT505 | 30 | 17-21 | lin=22.5mA RL=1kΩ¸ | -10%~0% | 10%Max | 9.3 | 20.9 | 7.2 |
| ZCT506 | 30 | 17-21 | lin=22.5mA RL=1kΩ¸ | -10%~0% | 10%Max | 5 | 17 | 9.5 |
| ZCT507 | 30 | 25-30.5 | lin=20mA RL=1kΩ¸ | -10%~0% | 10%Max | 6 | 18.6 | 10 |
| ZCT511 | 20 | 4.8-5.1 | lin=20mA RL=1kΩ¸ | -10%~0% | 10%Max | 6.8 | 17.5 | 7.8 |
| ZCT515 | 30 | 3.2-4 | lin=25mA RL=330Ω¸ | -10%~0% | 10%Max | 8.1 | 18 | 6.5 |
| ZCT516 | 40 | 6.3-7.3 | lin=22.5mA RL=1kΩ¸ | -10%~0% | 10%Max | 7.1 | 17 | 19.1 |
| ZCT519 | 50 | 17-22 | lin=11mA,RL=2kΩ¸ | -10%~0% | 10%Max | 9 | 23 | 8.3 |
| ZCT520 | 50 | 20-24 | lin=20mA RL=1kΩ¸ | -10%~0% | 10%Max | 12 | 26.7 | 11 |
| ZCT526 | 40 | 25-30 | lin=25mA RL=1kΩ¸ | -10%~0% | 10%Max | 5.8 | 19.3 | 7.8 |
| ZCT528 | 30 | 7.5-12 | lin=30mA,RL=1kΩ¸ | -10%~0% | 10%Max | 9.3 | 20.9 | 7.5 |
| ZCT534 | 40 | 6.4-7.5 | lin=20mA RL=1kΩ¸ | -10%~0% | 10%Max | 6.8 | 17.4 | 6.5 |
| ZCT538 | 30 | 3.6-3.8 | lin=500mA,RL=150Ω¸ | -10%~0% | 10%Max | 5.5 | 15.4 | 5.3 |
| ZCT541 | 50 | 12-13 | lin=25mA RL=330Ω¸ | -10%~0% | 10%Max | 9 | 22 | 8.3 |
| ZCT543 | 20 | 3.5-4.5 | lin=20mA,RL=370Ω¸ | -10%~0% | 10%Max | - | - | 6.4 |
| ZCT547 | 30 | 15-18 | lin=500mA,RL=150Ω¸ | -10%~0% | 10%Max | - | - | 17 |
| ZCT548 | 30 | 13.2-17.8 | lin=11mA,RL=360Ω¸ | -10%~0% | 10%Max | 19 | 5 | 7.5 |