MV Surge Arresters upto 36 kV
MV Surge Arrester upto 45kV for substation protection from lightening and switching over voltages. In past 15 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
Specifications
| Distribution Medium Duty (DM) Class MV Surge Arrester (Outdoor) |
|---|
| Bowthorpe EMP DA0 series surge arrester |
| Tested in accordance with IEC60099-4 at independent accredited laboratories |
| Direct moulded housing prevents moisture ingress |
| Low residual voltages |
| High-energy handling safe non-shattering short circuit behavior at higher current levels |
| Maintenance free Hydrophobic silicone housing, tracking and erosion resistant |
| Excellent cantilever and tensile performance |
| Quality design conforming to international standards |
| Application – protection of MV networks and equipment from lightning and switching surge related over-voltages, optimized to protect distribution assets including transformers and cable-end terminations |
| Distribution Heavy Duty (DH) Class MV Surge Arrester (Outdoor) |
|---|
| Safe non-shattering short circuit behaviour to higher current levels |
| Cage design |
| Type tested in accordance with IEC60099-4, Ed 3.0 (2014) at independent laboratories |
| Alternating sheds for best pollution flashover resistance |
| Hydrophobic silicone housing for outdoor use |
| Excellent operating performance and long service life |
| Directly molded housing prevents moisture ingress |
Technical Information
|
Distribution Medium Duty (DM) Class MV Surge Arrester (Outdoor) |
DA0 | |
|---|---|---|
| Application | Outdoor | |
| Rated voltage Ur | kV | 3-12 |
| Line discharge class as per IEC60099-4 | 1 | |
| Arrester class designation | DM | |
| Rated discharge current 8/20 µs | kA | 5 |
| High current impulse 4/10µs | kA | 100 |
| TOV (kV) | ||
| 1s | 1.18xUr | |
| 100s | 1.12xUr | |
| High current short circuit Pre failing method | kA | 16 |
| Mechanical data | ||
| Cantilever | Nm | 150 |
| Tension | N | 1000 |
| Torque | Nm | 30 |
| Distribution Heavy Duty (DH) Class MV Surge Arrester –(Outdoor) | DA1 | HDA | HDA-M | OCP-1 | |
|---|---|---|---|---|---|
| Application | Outdoor | Outdoor | Outdoor | Outdoor | |
| Rated voltage Ur | kV | 4-45 | 3.7-30 | 32.5-51.2 | 4-51.5 |
| Line discharge class as per IEC60099-4 | 1 | 1 | 1 | 1 | |
| Arrester class designation | DH | DH | DH | DH | |
| Rated discharge current 8/20 µs | kA | 10 | 10 | 10 | 10 |
| High current impulse 4/10µs | kA | 100 | 100 | 100 | 100 |
| Energy (according to IEC 99-4, 8.5) Line discharge | kJ / kV Ur | 5.6 | 5.3 | 5.3 | 5.1 |
| High current short circuit Pre failing method | kA | 21 | 40 | 40 | 25 |
| Mechanical data | |||||
| Cantilever | Nm | 350 | 350 | 350 | 350 |
| Tension | N | 2000 | 2000 | 2000 | 2000 |
| Torque | Nm | 50 | 50 | 50 | 50 |
| Distribution Heavy Duty (DH) Class MV Surge Arrester (Outdoor) | DOV | |
|---|---|---|
| Application | Outdoor | |
| Rated voltage Ur | kV | 3- 36 |
| Arrester class designation | DH | |
| Rated discharge current 8/20 µs | kA | 10 |
| High current impulse 4/10µs | kA | 100 |
| Repetitive Charge transfer rating (Qrs) | C | 0.4 |
| Thermal Charge transfer rating (Qth) | C | 1.1 |
| TOV (kV) | ||
| 1s | 1.12xUr | |
| 10s | 1.08xUr | |
|
Distribution Heavy Duty (DH) Class MV Surge Arrester (Indoor) |
RDA | SPA | CPA | |
|---|---|---|---|---|
| Application | Indoor | Indoor | Indoor | |
| Rated voltage Ur | kV | 7.5-30 | 7.5-40 | 4-51.5 |
| Arrester class designation | DH | DH | DH | |
| Rated discharge current 8/20 µs | kA | 10 | 10 | 10 |
| High current impulse 4/10µs | kA | 100 | 100 | 100 |
| Energy (according to IEC 99-4, 8.5) Line discharge | kJ / kV Ur | 3.3 | 3.3 | 3.3 |
| 10s | 1.25 | 1.25 | 1.25 | |
| High current short circuit Pre failing method | kA | 16 | 16 | 16 |
| Mechanical data | ||||
| Cantilever | Nm | 200 | 200 | 200 |
| Tension | N | 1000 | 1000 | 1000 |
| Torque | Nm | 58 | 58 | 58 |
| Station Low Duty (SL) Class MV Surge Arrester (Indoor) | PCA-I | |
|---|---|---|
| Application | Indoor | |
| Rated voltage Ur | kV | 6- 72.5 |
| Arrester class designation | SL | |
| Rated discharge current 8/20 µs | kA | 10 |
| High current impulse 4/10µs | kA | 100 |
| Energy (according to IEC 99-4, 8.5) Line discharge | kJ / kV Ur | 7.8 |
| Repetitive Charge transfer rating Qrs) | C | 2.2 |
| TOV (kV) | ||
| 1s | 1.15x Ur | |
| 10s | 1.10x Ur | |
| High current short circuit Pre failing method | kA | 63 |
| Mechanical strength | ||
| Safe Long -term load (SLL) | kNm | 2 |
| Safe Long -term load (SSL) | kNm | 2.5 |
| Station Low Duty (SL) Class MV Surge Arrester (Outdoor) | OCP-2 | PAA1 | PCA-I | |
|---|---|---|---|---|
| Application | Outdoor | Outdoor | Outdoor | |
| Rated voltage Ur | kV | 6- 72.5 | 6- 72.5 | 6-42 |
| Arrester class designation | SL | SL | SL | |
| Rated discharge current 8/20 µs | kA | 10 | 10 | 10 |
| High current impulse 4/10µs | kA | 100 | 100 | 100 |
| Energy (according to IEC 99-4, 8.5) Line discharge | kJ / kV Ur | 7.5 | 4.5 | 7.8 |
| TOV (kV) | ||||
| 1s | 1.14 x Ur | 1.08x Ur | 1.15x Ur | |
| 10s | 1.12x Ur | 1.04x Ur | 1.10x Ur | |
| High current short circuit (Pre failing method) | kA | 25 | 40 | 65 |
