As a professional manufacturer in China, Comewill would like to provide you customized CTK Type Zero-sequence Current Transformer. The core function of the it is to capture the zero sequence component of the current - the sum of the three-phase currents, also known as the "neutral line current" in the industry, because this part of the current flows in the neutral conductor of the three-phase system. For procurement projects with power safety protection requirements, the precise detection performance of this product is a major highlight, which is very suitable for various scenarios that require reliable grounding fault monitoring.
In practical use, CTK type zero-sequence current transformers will be used in conjunction with relay protection devices or signal systems. When zero sequence grounding current occurs in the power system (such as electric shock or leakage fault in the circuit), the secondary side of the transformer will output the corresponding zero sequence current, which will trigger the action of the equipment connected to the secondary line, such as cutting off the power supply, issuing alarm signals, etc., ultimately achieving protection and monitoring of the circuit and equipment. For the purchaser, the seamless collaboration with supporting equipment greatly enhances the practical application value of the product.
When installing, this transformer is usually mounted on the neutral conductor of a three-phase system, and it can output a signal proportional to the zero sequence current component. It is worth mentioning that even if the fault current is small, it can accurately detect grounding faults, which solves a key problem in electrical safety protection. With it, equipment damage can be avoided due to faults, and the risk of electric shock to personnel can be reduced. Therefore, it is a popular purchasing choice in power distribution systems, motor control centers, and other electrical devices that are prone to grounding faults.
If there is a need for bulk procurement, customization, or technical consultation of CTK type zero-sequence current transformers, Welcome (Wenzhou) Electric Co., Ltd. can provide professional one-stop services to meet the diverse needs of projects in different fields such as industry, commerce, and infrastructure.
| 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 |
Mechanical dimension(for reference only)
| Model Specifications | Dimensions | ||||||
| Reference current | ø | A | B | C | D | E | |
| CTK-45 | ≤100A | 45 | 104 | 81 | 95 | 5 | 28 |
| CTK-65 | ≤225A | 65 | 124 | 101 | 115 | 5 | 28 |
| CTK-80 | ≤400A | 80 | 138 | 116 | 130 | 5 | 28 |
| CTK-100 | ≤630A | 100 | 158 | 136 | 150 | 5 | 28 |
1、 Core advantages
Can accurately detect unbalanced currents: CTK type zero-sequence current transformers are specifically designed for three-phase power systems, and can measure unbalanced currents formed by the sum of three-phase currents. If there is a fault current leaking from one or several phase conductors to the ground, that is, a grounding fault occurs, it can be detected in a timely manner.
Extremely high sensitivity: even small ground fault currents can be detected by this transformer. In this way, it can prevent equipment from breaking down due to malfunctions, reduce the risk of electric shock to personnel, and make the electrical system operate more safely.
Accurate measurement: Even in the presence of strong noise or other interference on site, it provides accurate measurement results for the CTK type zero-sequence current transformers, which can provide reliable data support for subsequent protection actions.
Installation without touching the circuit: It is particularly convenient to install without disconnecting the circuit or stopping the load. Simply place it on the neutral conductor of the three-phase system without affecting the normal operation of the system.
Wide adaptability frequency: The working frequency can cover 50Hz to 400Hz, and it can adapt to any common electricity usage scenario with good compatibility.
Not affecting the operation of the circuit: The load itself is very low, which will not have a significant impact on the operation of the circuit, nor will it interfere with the accuracy of other measuring equipment in the system, ensuring the stable operation of the entire electrical system.
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No.777 Wanweng Road, Wengyang Sub-district, Yueqing City, Wenzhou City, Zhejiang Province, China
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