MV Surge Capacitors
MV Surge Capacitors Supplier
MV Surge Capacitors
Surge Capacitor / RC transient suppressor comprise of specially designed capacitor in series with a non-inductive resistor. These capacitors are designed and manufactured by using latest technology high quality material. These capacitors employ a technique where in the dielectric comprises several layers of polypropylene film impregnated with an non PCB liquid
An MV Surge Capacitor (Medium Voltage Surge Capacitor) is a specially designed capacitor used in medium voltage power systems (1kV to 36kV) to suppress high-frequency surges, protect insulation, and improve the performance of switchgear, motors, transformers, circuit breakers, and other electrical equipment.
Surge capacitors act as a low-impedance path to high-frequency transients or surges, absorbing and smoothing them out before they can cause damage to the system. Daga Switchgears & Electricals Pvt. Ltd. is a trusted MV Surge Capacitor supplier in Kolkata, West Bengal, Odisha, Bihar, Jharkhand, Chhattisgarh, and Assam. Our Medium Voltage Surge Capacitors are designed for industrial-grade reliability and are ideal for protecting motors, transformers, and Medium Voltage Switchgear from transient overvoltage.
Features
- Extended foil design
- Bushings with desired BIL
- Low energy consumption.
- CRCA / SS Containers
- Suitable for Indoor and outdoor application
- Temp Class : -0 C to +55 C.
Specification
- IS 11548 :1986
Range
- 0.05mfd to 10mfd
- Available from 440V to 40 KV range.
- Number of phases: 1 / 3
- Number of Bushing : 1 / 2 / 3
Purpose of MV Surge Capacitors
- Protects equipment insulation from transient overvoltages
- Reduces voltage spikes caused by switching operations, lightning, or capacitor bank energization
- Often used in series with surge arresters for comprehensive protection
- Increases dielectric life of connected devices
- Helps in damping oscillations due to transient disturbances
Technical Specifications
| Parameter | Specification |
| Rated Voltage | 3.3 kV, 6.6 kV, 11 kV, 22 kV, 33 kV |
| Capacitance Range | 0.1 µF to 2 µF or as per system requirement |
| Frequency | 50 Hz / 60 Hz |
| Dielectric | All polypropylene film (dry-type or oil-filled) |
| Voltage Withstand | 1.5 to 2 times the rated voltage for short durations |
| Terminals | Porcelain bushings or epoxy insulators |
| Discharge Device | Built-in discharge resistors |
| Protection Class | Indoor / Outdoor (IP54 / IP65 / IP66) |
| Standards | IEC 60871, IS 11548 |
Applications of MV Surge Capacitors
- Power Transformers: Installed on transformer terminals to protect winding insulation from transients
- Motors: Installed at motor terminals (especially in high-capacity motors) to protect against switching surges
- Switchgear: Used at the output terminals of circuit breakers to suppress breaker restrike surges
- Capacitor Banks: Installed to protect other capacitors and control resonance conditions
- GIS (Gas-Insulated Switchgear): Where high-frequency oscillations are more likely
- Protection of transformer windings
Key Features
- Robust design to withstand harsh electrical and environmental conditions
- Long life under continuous electrical stress
- Minimal maintenance required
- High-frequency filtering to protect sensitive equipment
- Can be used with surge arresters for layered protection strategy
BRIEF PERFORMANCE DATA
| CHDSU (surge capacitor) | |
| Power | 0.1 to 1.0 µF (typical values: 0.13, 0.25, 0.5 µF) |
| Voltage range | 1-36 kV |
| Frequency | 50-60 Hz |
| Bushings | 1,2 (single-phase) or 3 (three-phase) |
| Dielectric | Polypropylene film |
| Impregnant | Non-PCB |
| Discharge resistors | Built-in |
| Operating temperature | -50/+60°C |
| Location | Indoor or outdoor |
| Altitude | Up to 1,000 m from sea level without derating Above 1,000 m from sea level with derating |
Benefits
- Extends the life of medium voltage motors and transformers
- Reduces maintenance costs by preventing premature insulation failure
- Enhances reliability of medium voltage networks
- Stabilizes voltage waveform by minimizing oscillations
- Protects investments in high-value power equipment
Installation Zones
- Power plants
- Substations
- Industrial manufacturing plants
- Electrical panels with medium voltage motors
- Renewable power installations (solar/wind) with transformers
Why with us?
- High transient voltage withstand
- Long life design
- Low loss dielectric
- Rugged construction