China EVT/ZW20-10 Zero Sequence Voltage Sensor - Dual Function for 10kV Systems | Trusted Suppliers & Factory
China EVT/ZW20-10 Zero Sequence Voltage Sensor - Dual Function for 10kV Systems | Trusted Suppliers & Factory
Product Functions
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Comprehensive Voltage Measurement: Provides simultaneous, independent outputs for accurate three-phase phase-sequence voltage and zero-sequence (residual) voltage monitoring.
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Advanced System Protection: The dedicated zero-sequence voltage signal enables highly sensitive and reliable detection of single-phase ground faults, crucial for system safety in isolated or resonant-earthed networks.
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Real-time Grid Monitoring: Delivers precise voltage data for energy metering, power quality analysis, and SCADA systems, supporting smart grid management and operational decision-making.
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Fault Localization: Assists in rapidly identifying and isolating faulty line sections by providing clear zero-sequence voltage signals during unbalanced system conditions.
Applicable Environment
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Switchgear Integration: Primarily designed for installation in ZW20-12 type outdoor vacuum circuit breaker cabinets and compatible medium-voltage switchgear panels.
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System Voltage: Rated for standard 10kV (Um=12kV), 50Hz three-phase AC power distribution networks.
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Installation Settings: Suitable for both indoor and outdoor applications within protective enclosures, built to endure typical environmental stresses such as temperature variations and humidity.
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Network Type: Ideal for use in distribution systems requiring effective ground fault protection, including ungrounded, resistance-grounded, or arc suppression coil-grounded networks.
Product Highlights
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Dual-Output Efficiency: Integrates two critical measurement functions into one compact device, saving panel space, reducing wiring complexity, and lowering overall system cost.
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Superior Precision & Reliability: Offers 0.5-class accuracy for phase voltage and meets stringent Level 1 accuracy for zero-sequence voltage, ensuring trustworthy data for both measurement and protection schemes.
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Robust Insulation Design: Features a high insulation level (12/42/75kV) and very low partial discharge (≤10pC), guaranteeing long-term operational safety and stability in demanding medium-voltage environments.
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Modern Sensor Technology: Utilizes electronic sensing principles, providing benefits such as a wide dynamic range, excellent linearity, no magnetic saturation, and immunity to ferromagnetic resonance issues common in traditional inductive transformers.
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Plug-and-Play Compatibility: Specifically engineered for straightforward installation and compatibility with ZW20 series circuit breakers, facilitating easy upgrades or integration into new switchgear assemblies.
Frequently Asked Questions
Q
What is the rated voltage and frequency for this voltage transformer?
This transformer is rated for 10kV (Um=12kV) at 50Hz, designed specifically for standard three-phase AC medium-voltage power distribution networks.
Q
What types of grounding networks is this product compatible with?
The product is suitable for ungrounded (isolated), resistance-grounded, and arc suppression coil-grounded (resonant-earthed) distribution networks, making it highly versatile for various grid configurations.
Q
What accuracy class does this transformer provide?
It offers 0.5-class accuracy for three-phase phase-sequence voltage measurement and meets Level 1 accuracy requirements for zero-sequence (residual) voltage, ensuring reliable data for both metering and protection applications.
Q
Which switchgear models is this transformer designed to work with?
It is primarily engineered for installation in ZW20-12 type outdoor vacuum circuit breaker cabinets and is compatible with other medium-voltage switchgear panels of similar specifications within the ZW20 series.
Q
How does this product help with single-phase ground fault detection?
The dedicated zero-sequence voltage output provides a highly sensitive signal that enables protection relays to detect single-phase ground faults quickly and accurately, helping to localize and isolate the faulty section of the network before it escalates.
Q
What are the advantages of using electronic sensing technology over traditional inductive transformers?
Electronic sensing technology offers a wider dynamic range, superior linearity, and complete immunity to magnetic saturation and ferromagnetic resonance — common problems in traditional inductive voltage transformers. This results in more stable, accurate, and safer long-term operation in medium-voltage environments.