Surge Arrester porcelain-housed EXLIM
A high strength arrester family for line discharge class 2 to 5 and system voltage up to 800 kV
EXLIM is family of porcelain-housed arresters that offer secure protection against overvoltages. They are installed the world over and in all climates. The wide reference base is testimony to their well respected performance. EXLIM arresters are type tested according to IEC 60099-4 and ANSI/IEEE C62.11. Also, complying with customer specific standards. Applicable to UHV (Ultra High Voltage) applications.
Applications
- Protection of substation equipment
- Transformers and reactors
- Capacitor banks
- Requirement of high mechanical loads
- Cables
- HVDC protection
Why Hitachi Energy?
- Minimal maintenance cost
- Customizable mechanical and electrical design
- Easy to install
Brief performance data
| R | Q-E | Q-D | P | T | ||
| System voltage | kV | 52 - 170 | 52 - 245 | 170 - 420 | 52 - 550 | 245 - 800 |
| Rated voltage | kV | 42 - 168 | 42 - 228 | 132 - 420 | 42 - 444 | 180 - 624 |
| Nominal discharge current | kApeak | 10 | 10 | 10 | 10/15 | 10/15/20 |
| Line discharge class | Class | 2 | 3 | 3 | 4 | 4 |
| Mechanical strength (SSL) | Nm | 7 500 | 7 500 | 18 000 | 18 000 | 18 000 |
Get to know more
- In-house production of ZnO blocks
The most important component for the surge arresters is the ZnO blocks, the varistors. Stacked in the center of the surge arrester, the varistor is the heart of the surge arrester. The varistor consist of a mix of zink oxide and other metallic powders that are blended and pressed into cylindrical blocks.
Hitachi Energy manufactures ZnO varistors with full control of the process from the raw material to the finished electrically characterized varistors. A high degree of automation and a large number of quality tests at all stages, from raw material to ZnO blocks, approved for arrester manufacture, ensure that they fulfil their stated data.
Type tests has been performed for every size of ZnO varistor. Each varistor is verified by rigorous testing – over and above both IEC & ANSI standard requirements:
Tests on ZnO blocks
Energy withstand test on all blocks - The blocks pass three energy test cycles with cooling in-between. In each cycle, the injected energy is far in excess of the single impulse energy capability. Blocks with insufficient energy capability are automatically rejected.
Classification of all blocks
The blocks are classified at 1 mA (d.c.) and 10 kA (8/20 μs) and the residual voltages are printed on each block together with a batch identification. Finally all blocks are visually inspected.
Accelerated life tests on samples
Power losses after 1 000 hours calculated from a test with shorter duration (approximately 300 hours) at an elevated temperature of 115 °C at 1.05 times Uc shall not exceed the losses at start of the test. Batches in which unapproved blocks appear are rejected.
Impulse current tests on samples
Blocks are subjected to high current impulses (4/10 μs) and long duration current impulses (2 500 μs) of amplitudes verifying catalogue data.
Read more about the testing of ZnO blocks here (link to pdf-file)
Get to know more
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