The CTK type zero-sequence current transformer is used in conjunction with the relay protection device or signal when the power system generates zero-sequence grounding current to make the device components act and realize protection or monitoring.
When an electric shock or leakage fault occurs in the circuit, the secondary side of the transformer outputs the zero-sequence current, so that the equipment on the connected secondary line can be protected (cut off the power supply, alarm, etc.).
A zero-sequence current transformer is a type of current transformer used to measure the unbalanced current in a three-phase electrical system. The CTK is designed to detect the zero-sequence component of the current, which is the sum of the three phase currents. This is also referred to as the "neutral current", as it is the current that flows in the neutral conductor of a three-phase system.
The CTK is typically used in applications where it is necessary to detect ground faults, which can occur when a fault current flows from one or more of the phase conductors to ground. The CTK is placed around the neutral conductor of the three-phase system, and it produces an output signal that is proportional to the zero-sequence component of the current.
By detecting the zero-sequence component of the current, the CTK can detect ground faults, even when the fault current is small. This can help to prevent damage to equipment and reduce the risk of electric shock to personnel. The CTK is commonly used in power distribution systems, motor control centers, and other electrical installations where ground faults can occur.
Electrical parameters | Mechanical parameters | ||
Frequency | 50~400Hz | Shell | ABS(flame retardant grade 94-V0) |
Rated input | 10mA~5A | Bobbin | PBT |
Measuring range | 10%In~130%In | iron core | Ni steel/nanocrystalline |
Rated output | 0~1v (A or) 0~0.25mA | Internal structure | Environmentally friendly epoxy resin casting |
Ratio difference | ≤±0.1% | Construction plan | Screw fixing |
Phase difference | ≤±10 | Working temperature | -25℃~ +75℃ |
Dielectric Strength | 2.5KV/1mA/1min | Ambient Humidity | ≤85% |
Insulation resistance | DC500V/1000MΩ/min | Wiring method | Terminal type/shielded twisted wire 1.5m |
Dimensions
Mechanical dimension(for reference only) |
Model Specifications | Dimensions | |||||||
Reference current | A | B | C | D | E | F | G | |
CTK-1025 | ≤100A | 155 | 63 | 105 | 30 | 148 | 5 | 28 |
CTK-1432 | ≤225A | 205 | 75 | 145 | 35 | 198 | 5 | 28 |
CTK-1832 | ≤400A | 245 | 75 | 184 | 35 | 238 | 5 | 28 |
CTK-2245 | ≤630A | 295 | 95 | 229 | 50 | 288 | 5 | 28 |
CTK-2645 | ≤1250A | 388 | 110 | 318 | 60 | 381 | 6 | 29 |
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