LJWD-10.12 Oil-Immersed High Voltage Current Transformer
LJWD-10.12 Oil-Immersed High Voltage Current Transformer Overview The LJWD-10.12 High Voltage Current Transformer is a steel tank, oil-immersed device designed for use in 10kV power systems. Suitable for both indoor and outdoor applications in 50Hz systems, it supports current measurement, energy metering, and relay protection. With the ability to operate continuously at 120% of its […]
LJWD-10.12 Oil-Immersed High Voltage Current Transformer Overview
The LJWD-10.12 High Voltage Current Transformer is a steel tank, oil-immersed device designed for use in 10kV power systems. Suitable for both indoor and outdoor applications in 50Hz systems, it supports current measurement, energy metering, and relay protection. With the ability to operate continuously at 120% of its rated current, it is built to perform reliably at altitudes up to 4000m and in ambient temperatures ranging from -25°C to +40°C, making it ideal for diverse and demanding environments.
LJWD-10.12 Current Transformer Type designation
The Key Features and Structure of LJWD-10.12 Current Transformer:
- L: Represents “Current Transformer.”
- J: Indicates “Steel Tank Oil-Immersed Type,” offering enhanced durability and insulation.
- W: Signifies suitability for both outdoor and indoor applications.
- D: Denotes Continuous Protection Control:
- With “D”: Double secondary winding.
- Without “D”: Single secondary winding.
- 10, 12: The rated voltage, indicating compatibility with 10kV or 12kV power systems.
This designation provides a clear understanding of the LJWD-10.12 Current Transformer, highlighting its technical features, structural characteristics, and suitability for diverse power system environments.
LJWD-10.12 Current Transformer Service conditon
- Location: Indoor and outdoor use.
- Temperature: -25°C to +40°C.
- Humidity: Max relative humidity 95%.
- Altitude: ≤2000m.
- Pollution Level: Class II.
Designed for reliable performance in diverse environments.
LJW-10, LJWD-12 oil-immersed CT Construction
The LJWD Oil-Immersed Current Transformer is a single-phase, self-cooling type suitable for both indoor and outdoor use. It employs advanced vacuum oil-filtering and oil-injection techniques to enhance cooling and insulation performance.
Key Features:
- Oil Tank Design:
- Equipped with an oiling valve and waterproof/snowproof cover for environmental protection.
- An internal diaphragm isolates the oil from air, reducing oxidation and extending service life.
- Thermal Stability: Engineered with a thermal stability factor of 187.5 times, ensuring reliability under demanding conditions.
- Configuration Options:
- Single-ratio with single secondary winding.
- Single-ratio with double secondary winding.
- Double-ratio with single secondary winding.
- Double-ratio with double secondary winding.
- CT Classes: Class 0.2: For measurement. Class 0.5 and 1.3 (D): For continuous protection and control.
This robust construction ensures exceptional durability and consistent performance, making it suitable for various 10kV and 35kV power systems.
LJWD-10 oil-immersed CT Technical Parameters
The LJWD-10.12 Oil-Immersed Current Transformer supports primary currents ranging from 5A to 1500A, with secondary configurations available for both single and double windings. It offers multiple accuracy classes, including 0.2, 0.5, and 3, ensuring precise measurement and protection. With a rated secondary capacity of up to 15kA, a short-time thermal current of up to 30kA, and a dynamic current of up to 50kA, this transformer delivers stable and reliable performance in 10kV and 12kV power systems, meeting the demands of diverse and challenging environments.
Technical Parameters Table 1
| Accuracy
Class |
Frequency
(Hz) |
Rated
Current Ratio (A) |
Rated
Secondary Capacity (kA) |
Rated
Primary Voltage (kV) |
Ratio of
Primary Current & Rated Current (%) |
Max.Error | Secondary
Load Situation |
|
|---|---|---|---|---|---|---|---|---|
| Ratio error% |
Phase
difference (min) |
|||||||
| 0.2
0.5 3 D |
50 | 5/5, 15/5
30/5, 40/5 50/5, 75/5 100/5, 150/5 200/5, 300/5 400/5, 600/5 1000/5, 1500/5 |
15 | 10 | 10
20 |
±10
±0.75 ±0.5 |
±50
±50 ±40 |
1. The load level should
not be smaller than 15 ohms within the rated capacity range of 25%-100%. 2. The load power factor is Cosφ = 0.8. |
Technical Parameters Table 2
| Type | Voltage
Class (KV) |
Rated Current
Ratio (A) |
Measurement Class
0.2 Capacity (VA) |
Capacity for Class 1
Continuous Protection |
Weight (kg) |
|---|---|---|---|---|---|
| LJW-10,12 | 11,12 | 5 – 400/5 | 10 – 15 | Without continuous
protection Without monitoring |
21 |
| LJWD-10,12 | 11,12 | 5 – 400/5 | 10 – (15) | 15 – (30) | 28 |
Customization and Support: We provide tailored solutions for the LJWD-10.12 Oil-Immersed Current Transformer, including custom current ratios, accuracy classes, and output ratings to fit your specific requirements. Contact us to create a transformer designed for your operational needs.
Outline and Dimensions of Installation
LJW-10, LJWD-12 Outline and Dimensions of Installation
This page provides detailed information about the LJWD-10.12 high-voltage Oil-Immersed Current Transformer, including wiring diagrams, technical specifications, accuracy, and dimensions. Customization options are available for the oil-immersed external tank, including tailored dimensions, materials, and designs to meet specific application requirements. For assistance with model selection or customized solutions for non-standard requirements, please contact our expert team.
FAQs for LJWD-10.12 Oil-Immersed Current Transformer
1. What are the primary applications of the LJWD-10.12 Oil-Immersed Current Transformer?
The LJWD-10.12 is used for current measurement, energy metering, and protective relaying in 10kV and 12kV power systems, suitable for urban and rural power grids, industrial substations, and transformer stations.
2. How does the oil-immersed design benefit the performance of the LJWD-10.12?
The oil-immersed design enhances cooling and insulation properties, allowing the transformer to handle higher currents and maintain stable performance in demanding environments.
3. Can the LJWD-10.12 Current Transformer be customized for specific applications?
Yes, it can be customized with various current ratios, accuracy classes, and secondary output ratings to meet specific operational requirements.
4. What maintenance is required for the LJWD-10.12 Oil-Immersed Current Transformer?
Maintenance primarily involves periodic inspection of the oil level, cleanliness, and integrity of the secondary circuit. Additionally, oil replacement may be necessary in some cases.
5. Is the LJWD-10.12 suitable for use in high-pollution environments?
Yes, the transformer is designed to operate in environments with pollution levels up to Class II, making it suitable for use in industrial areas with moderate pollution.
6. What standards does the LJWD-10.12 comply with?
The transformer conforms to the GB1208-1997 standards, ensuring reliable performance and safety in high-voltage applications.
- Working Principle of Zero-Sequence Current Transformers
- Error Analysis and Maintenance of Current Transformers in Power Systems
- Introduction to Combined Transformers and Their Classification
- Common Fault Handling for Current and Voltage Transformers
- 3 Voltage Transformer Faults and Solutions: Ensuring Accurate Measurement and Protection
- Analysis of the Impact of Incorrect CT S1 and S2 Connections and Reversed Input Lines