Residual Voltage Transformer (RVT)
A Residual Voltage Transformer (RVT) is designed to detect and extract the residual voltage (earth fault voltage) present in a power system. This voltage is obtained across the open delta (broken delta) winding of the transformer and is primarily used for earth fault detection and protection in electrical networks.
Under normal operating conditions, the residual voltage across the open delta winding remains zero or negligible. However, when an earth fault occurs in the system, a residual voltage is developed across this winding. This voltage signal is then used to operate protection relays, enabling quick detection and isolation of the faulty section of the network, thereby enhancing system safety and reliability.
Residual Voltage Transformer are widely used in residual earth fault protection schemes and also play an important role in discharging capacitor banks, ensuring safe operation of power systems.
In addition to the protection winding, a dedicated metering secondary winding is also provided to facilitate accurate voltage measurement for monitoring and metering applications.
Our Residual Voltage Transformer are engineered for high reliability and accuracy and are manufactured in accordance with relevant industry standards for protection and measurement applications.
Available Voltage Range:
We manufacture RVTs for system voltages ranging from 3.3 kV to 33 kV, suitable for various medium-voltage distribution and protection applications.
Key Product Advantage (USP):
- Manufactured with multi-range and multi-core configurations with extended burden capability when required. Suitable for Low Voltage (LT) and High Voltage (HT) applications.
- Available in Single Phase and Three Phase configurations.
- Equipped with Automatic Pressure Gelation (APG) machines for Medium Voltage transformer manufacturing.
- Products undergo type testing in NABL Accredited Laboratories to ensure high reliability and compliance with industry standards.
- Custom designs can be developed as per specific customer or project requirements.
| Parameter | 11 KV | 22 KV | 33 KV | |
|---|---|---|---|---|
| Primary Voltage | 11000 V | 22000 V | 33000 V | |
| Secondary Voltage | 110 - 190 V | 110 - 190 V | 110 - 190 V | |
| R. Burden | As per Customer Requirement | |||
| A. Class | Metering: 1.0, 0.5 Protection: 6P, 3P |
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| Voltage Factor | 1.2 Cont & 1.9 for 8 hours | |||
| Application Standard | IS 16227 & IEC 61869 | |||
| Insulation Level | 12/28/75 KVp | 24/50/125 KVp | 36/70/170 KVp | |
| Insulation Class | A for Oil Cooled & B or higher for Resin Cast | |||
| Winding Material | Copper | |||
| Frequency | 50 or 60 Hz | |||
| Resin Cast RVT | ||||
| Dimensions | 520×400×400 | - | - | |
| Weight (approx.) | 60 Kgs | - | - | |
| Oil Cooled RVT | ||||
| Dimensions (approx.) | 550×400×780 | 750×450×900 | 850×550×1100 | |
| Weight (approx.) | 110 Kgs | 225 Kgs | 320 Kgs | |
