10kV voltage transformer
06-21 2025 | By:
10kV voltage transformer-dry type/ single-phase/ three-phase/ indoor /outdoor
1. Definition
10kV voltage transformer-dry type/ single-phase/ three-phase/ indoor /outdoor
10kV Potential Transformer (PT) is a measuring device that converts 10kV high voltage system voltage into standard low voltage (such as 100V or 100/√3 V) in proportion. It is used for energy metering, relay protection, system monitoring, etc. It also realizes electrical isolation between high voltage and low voltage circuits to ensure safe operation.
2. Specifications
| Parameters | Typical Values | Description |
|---|---|---|
| Rated primary voltage | 10kV（or 10/√3 kV） | System nominal voltage |
| Rated secondary voltage | 100V（Line voltage）或100/√3 V（Phase voltage） | Standard Output |
| Accuracy | 0.2Level（Measurement）、0.5Level（monitor）、3P Level（Protect） | The higher the accuracy, the smaller the error |
| Rated capacity | 10VA~200VA | Select according to load (small capacity for measurement, large capacity for protection) |
| Insulation Level | Power frequency withstand voltage42kV/1min，Lightning strike75kV | Ensure pressure resistance |
| Transformation ratio | 10000/100V or 10000/√3 : 100/√3 V | Standard ratio |
| Frequency | 50Hz（Chinese Standards） | Power system frequency |
3. Application scenarios
（1）Energy Metering
- Used for electricity bill settlement of 10kV distribution system (requires 0.2-level high-precision PT)。
- Cooperate with electric energy meter to monitor the power consumption of users or factories。
（2）Relay protection
- Provide voltage signal to protection device, such as：
- Low voltage protection (to prevent the motor from running under voltage)
- Overvoltage protection (to prevent lightning strikes or operational overvoltage)
- Ground fault detection (insulation monitoring of systems with ungrounded neutral point)
（3）System Monitoring and Control
- Monitor 10kV bus voltage to ensure stable operation of the power grid。
- For automatic switching devices (such as voltage control of capacitor banks)。
（4）Grid-connected Synchronization
- When a power plant or distributed power source is connected to the grid, it is used to check the synchronization operation。
4. Selection points
- Environmental requirements：
- Choose oil-immersed type for outdoor use (strong weather resistance), and dry type for indoor use (explosion-proof and maintenance-free)。
- Accuracy requirements：
- 0.2 level for measurement, 3P level for protection。
- Capacity matching：
- Ensure that PT capacity ≥ total power of secondary load (such as electric meter, protection device, etc.)。
- Special needs：
- If the system is prone to ferromagnetic resonance, an anti-resonance PT (with damping winding) should be selected.。
5. Notes
- The secondary side must be reliably grounded to prevent high voltage from entering the low voltage circuit.
- Avoid short circuit on the secondary side, otherwise the PT may be burned.
- Regular calibration ensures measurement accuracy and insulation performance.
Summary
10kV voltage transformer is a key device in the power distribution system and is widely used in metering, protection, monitoring and other scenarios. When selecting, it is necessary to comprehensively consider factors such as environment, accuracy, capacity, etc., and properly install and maintain it to ensure the safe and stable operation of the power system.
You may also find these interesting:
