The wound type current transformer is designed for reliable current measurement and protection in medium voltage power systems such as 10kv 20kv and 35kv. Available in current ratios of 100/5A, 150/5A, and 400/5A, and with protection accuracy classes of 5P10 and 5P20, this wound type 5p10 5p20 ct 100 150 400 5a provides precise secondary current output suitable for both measuring, metering, and protective relay applications.
Manufactured with solid magnetic cores and secondary coils, the wound type current transformer ensures stable performance under short circuit conditions and delivers accurate current transformation even during transient events. Its robust insulation system, often incorporating epoxy or high grade resin, ensures safety, long service life, and resistance to moisture and environmental stress.
The wound type design allows flexible installation in switchgear, control panels, and distribution boards, to provide dependable support for relay protection schemes. The wound type current transformer is ideal for industrial plants, commercial facilities, and utility distribution networks where accurate and reliable current measurement is essential for both operational monitoring and protective control.
| Type | Primary Rated Current (A) | Accuracy Class | Accuracy Class and Rated Output cosΦ=0.8 | Shory-Time thermal Current (kA/S) | Rated Dynamic Current (kA) | ||
| 0.2 (s) | 0.5 (s) | 10P10 | |||||
| LZZBJ9-35 | 20-100 | 0.2/0.2 0.2/0.5 0.2/5P20 0.5/5P20 0.2/0.5/5P 0.2/5P/5P | 10 | 10 | 15 | 150I1n | 375I1n |
| 150-200 | 31.5 | 80 | |||||
| 300-500 | 31.5/2 | 80 | |||||
| 600-1250 | 15 | 30 | 20 | 31.5/4 | 80 | ||
| 1500-2000 | 20 | 40 | 30 | 40/4 | 125 | ||
| 2500 | 20 | 40 | 20 | 40/4 | 125 | ||
| Type | Primary Rated Current (A) | Accuracy Class | Capacity (VA) | Shory-Time thermal Current (kA/S) | Rated Dynamic Current (kA) |
| LZZBJ9-35 | 10 | 0.2/10P10 0.5/10P10 0.2/5P20 0.5/5P20 0.2/0.5/10P10 0.2/0.5/5P20 0.2/10P10/5P20 0.5/10P10/5P20 | 15/20 20/20 15/20 20/20 15/20/20 15/20/20 15/20/20 20/20/20 | 1.5/1 | 3.75 |
| 20 | 2/1 | 5 | |||
| 30 | 3/1 | 7.5 | |||
| 40 | 4/1 | 10 | |||
| 50 | 5/1 | 12.5 | |||
| 75 | 7.5/1 | 18.75 | |||
| 100 | 10/1 | 25 | |||
| 150 | 15/1 | 37.5 | |||
| 200 | 20/1 | 50 | |||
| 300 | 31.5/1 | 80 | |||
| 400 | 31.5/2 | 80 | |||
| 500 | 31.5/2 | 80 | |||
| 600 | 31.5/2 | 80 | |||
| 800 | 31.5/3 | 80 | |||
| 1000 | 31.5/3 | 80 | |||
| 1200 | 31.5/3 | 80 | |||
| 1500 | 31.5/3 | 80 | |||
| 2000 | 31.5/3 | 80 |
Q: What does “wound-type 5P10” or “5P20” mean in a wound type 5p10 5p20 ct 100 150 400 5a?
A: The term “wound-type” refers to CTs where the primary conductor is a wound winding rather than a busbar or bar through the core. The class 5P10 or 5P20 indicates protection accuracy: 5P means up to 5% error at rated secondary current, and the number 10 or 20 is the maximum permissible short-time multiple of the rated primary current without exceeding the specified error.
Q: How do I choose the correct CT rating for my system?
A: Select a CT based on your system’s maximum load current and protection requirements. For example, a 100/5A CT is suitable for circuits with typical currents around 100 A, while 400/5A is designed for higher-current feeders. Choose a protection class (5P10 or 5P20) according to the relay’s fault detection sensitivity and the expected short circuit current.
Q: What environmental conditions can wound type 5p10 5p20 ct 100 150 400 5a handle?
A: These wound type current transformers are typically rated for ambient temperatures from –10 °C to +40 °C, with a maximum altitude of 1000 m. Housing materials and insulation systems are designed for moisture, dust, and pollution resistant operation, to ensure reliable protection performance in industrial and utility settings.
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No. 391, Jingqi Road, Yanpan Industrial Zone, Yueqing City, Zhejiang Province, China
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