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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

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)