Polymeric MV Surge Arrester (up to 52 kV)
MV Surge Arrester upto 45kV for substation protection from lightening and switching over voltages. In past few years, almost all high-voltage networks used MO arresters. However, in medium-voltage networks, a substantial number of conventional gapped arresters (SiC resistors and series spark gaps) were installed until a few years ago. Today MO (Metal-Oxide) arresters without spark gaps have gained popularity. Networks require improved protection level and better performance in polluted environments. The switch to polymeric housings made it possible to do without the previously necessary spark gaps. Polymeric housings are reliable against ingress of moisture and provide minimal risk of failures (violent shattering of the housing). MVSA are manufactured using high quality MOV blocks which display excellent thermal and current handling characteristics due to guaranteed homogeneity of the varistor volume. In the wrap design surge arresters, the MOV blocks are wrapped with fiberglass ribbons impregnated with epoxy resin to create stacks of MOV blocks.
- Excellent TOV performance.
- Safe, non-shattering failure in short circuit test
- Higher energy handling capability
- Crimped structural construction is light in weight, provides optimal mechanical strength
- Void free construction and optimum interface sealing achieved by bonding silicone housing directly to MOV blocks and aluminium end fittings with special bonding solution
Description
Raychem MV surge arresters are metal-oxide (ZnO/MOV) gapless arresters used to protect electrical equipment and networks from lightning and switching over voltages. They are designed for systems up to 52 kV rated voltage class and comply with IEC 60099-4 standards.
They are widely used in:
- Substations
- Distribution lines (overhead & underground)
- Transformers, switchgear, and cable terminations
Construction & Design Features :
- Metal Oxide Varistor (MOV) Technology
- Core element consists of ZnO varistor blocks with highly non-linear V-I characteristics
- Conducts negligible current under normal voltage
- Becomes conductive during surge → diverts surge to ground
- Provides fast response and precise voltage clamping
- Gapless Design
- No series spark gaps (unlike older SiC arresters)
- Ensures:
-
- Better protection levels
- Faster operation
- Improved reliability in polluted environments
- Polymeric (Silicone Rubber) Housing
- Direct moulded, hydrophobic silicone housing
- Advantages:
-
- Resistant to moisture ingress
- Excellent pollution performance
- Lightweight and shatter-proof (non-explosive failure)
- Mechanical Construction
- Fiberglass/FRP reinforced core with epoxy bonding
- Aluminium end fittings
- High mechanical strength (cantilever & tensile)
- Compact and lightweight design
Electrical Characteristics (Typical for up to 52 kV class) :
- Rated Voltage (Ur): up to 52 kV
- Continuous Operating Voltage (Uc): selected based on system voltage
- Nominal Discharge Current: typically, 5–10 kA (8/20 µs waveform)
- High Current Impulse: up to 100 kA (4/10 µs)
- Energy Handling Capability: high (line discharge class as per IEC)
- Low Residual Voltage: ensures better insulation protection
Performance Features :
- Excellent temporary overvoltage (TOV) withstand capability
- High energy absorption capacity
- Non-linear characteristic ensures effective surge suppression
- Safe non-shattering short-circuit behaviour
- Maintenance-free operation
- Long service life in harsh outdoor environments
Advantages :
- Improved protection of costly equipment (transformers, switchgear)
- Reduced system outages and failures
- Superior performance in polluted, humid, or coastal conditions
- Lightweight and easy installation
- Reliable operation for both indoor and outdoor applications
Applications :
- Medium-voltage distribution networks
- Substation equipment protection
- Cable terminations and feeders
- Motors and capacitor banks
- Railway electrification systems
In short: Raychem MV surge arresters are modern, reliable, and efficient devices that protect medium-voltage systems by safely diverting surge currents to ground and preventing equipment damage.
Brand
Raychem RPG
Reviews
There are no reviews yet.