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China LZZBJ9-35D Indoor Epoxy Resin Casting Current Transformer - Lightweight, Pollution-Resistant Suppliers & Factory
General
It is designed for use in power systems with a rated frequency of 50 or 60 Hz and a rated voltage of 35 kV and below, installed indoors. It is mainly used for electric energy metering, current measurement, and relay protection. This type of current transformer is generally used in air insulated switchgear rated at 6 to 35 kV.
Standards
- IEC61869.1-2007 Instrument transformers Part 1: General technical requirements
- IEC61869.2-2012 Instrument Transformers Part2: Complementary technical requirements for current transformers
- GB311.1-1997 Insulation and coordination of high-voltage transmission and transformation equipment
- GB 5583-1985 Partial discharge measurement of instrument transformers
- GB/T 22071.1-2008 Instrument Transformer Test Guidelines Part I: Current Transformers
- JJG 1021-2007 Electrical Transformer Verification Regulations
Service Conditions
Ambient Temperature
• Maximum temperature: + 40℃
• Minimum temperature: - 5℃
• Average daily temperature: Not exceed 30℃
Altitude & Environment
• Altitude: Not exceed 1000m
• Insolation radiation: Effects can be ignored
• Air Quality: Free of obvious dust, smoke, corrosive gases, steam or salt
Humidity Conditions
• 24h Average Relative Humidity: ≤ 95%
• 24h Average Water Vapor Pressure: ≤ 2.2kPa
• Monthly Average Relative Humidity: ≤ 90%
• Monthly Average Water Vapor Pressure: ≤ 1.8kPa
Technical Data
- Rated insulation level: 40.5/95/185kV
- Rated frequency: 50Hz or 60Hz
- Rated secondary current: 5A or 1A
| Rated primary current (A) | Accuracy class combination | Accuracy class and rated output | Short time thermal current (kA/s) | Rated dynamic current (kA) | Weight (kg) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0.2(S) / 0.5(S) | 0.5 | 5P20 | 5P25 | 5P30 | kA | S | ||||
| 20-100 | 0.2(S)/5P 0.5(S)/5P 0.2(S)/0.5(S)/5P 0.2(S)/0.5(S)/5P/5P |
30 | 30 | 30 | 25 | 20 | 150│1n | 2 | 375│1n | 140 |
| 150 | 25 | 1 | 63 | |||||||
| 200-250 | 31.5 | 1 | 80 | |||||||
| 300-500 | 31.5 | 2 | ||||||||
| 600-800 | 31.5 | 4 | ||||||||
| 1000-3150 | 31.5 | 4 | ||||||||
※Note: If the parameters are beyond the above range, it can be discussed and confirmed with us.
Appearance and installation size
Frequently Asked Questions (FAQ)
What are the primary applications of this current transformer?
This current transformer is designed for indoor power systems with a rated voltage of 35 kV and below. It is mainly used for electric energy metering, current measurement, and relay protection within air-insulated switchgear.
What standards does this current transformer comply with?
It complies with key international and national standards including IEC61869.1-2007, IEC61869.2-2012, GB311.1-1997, GB 5583-1985, GB/T 22071.1-2008, and JJG 1021-2007.
What are the environmental limits for installing this transformer?
It is suitable for indoor installation at altitudes not exceeding 1000m. The ambient temperature should remain between -5℃ and +40℃ (with a daily average not exceeding 30℃), and the air should be free of dust, corrosive gases, steam, or salt.
What are the humidity limits for safe operation?
The daily average relative humidity must not exceed 95% (water vapor pressure ≤ 2.2kPa), and the monthly average relative humidity must not exceed 90% (water vapor pressure ≤ 1.8kPa).
Can I customize the technical parameters if my requirements are outside the standard range?
Yes. If your required parameters (such as rated primary current, accuracy class, or outputs) fall outside the standard ranges listed in our technical data table, please contact us directly to discuss and confirm custom specifications.