SURGE ARRESTERS SPECIFICATION FOR 132 KV & 33 KV LINE

Surge Arrester Or Lightning Arrester Specification
Surge Arrester Specification

Surge Arrester Requirements for 132kV and 33kV Underground Cable Line Projects

 
Surge arresters shall be of the type employing non linear metal oxide resistors without spark gaps. The Contractor shall demonstrate by calculations that the surge arresters will adequately protect the switchgear arrangement proposed.

Arresters shall be designed and tested in accordance with the requirements of IEC 99 4. Any departure shall be the subject of agreement between the Engineer and the Contractor. Routine tests shall be carried out in accordance with the requirements of Section 15 of this Specification.

Surge arresters shall be housed in porcelain insulators designed to withstand extremes of the environment described. The insulation shall have a minimum creepage distance of 25 mm/kV rated system phase to phase voltage. Porcelain shall comply with IEC 233. The method of sealing against the ingress of moisture shall be of a type well proven in service and the manufacturing procedures shall include an effective leak test which can be demonstrated to the inspecting engineer if required.

The internal components of arresters shall be arranged to minimize radial voltage stresses, internal corona and to ensure minimal capacitive coupling with any conducting layer of pollutant on the outside of the porcelain housing except where approved, organic materials are not permitted.

Good electrical contact shall be maintained between resistor blocks taking account of any thermal expansion and contraction of the block or mechanical shock during transport and erection, by installing a well proven clamping system.

Metal oxide arresters installed outdoors shall be able to dissipate, when new, twice the energy generated in the resistor blocks when energized at their maximum continuous operating voltage immediately having been subjected to the discharge duties specified in IEC 99 4 and assuming that the porcelain housing and the surrounding air is at least 5˚C higher than the maximum ambient air temperature specified.

Good quality control of the manufacturing process of the resistors shall be ensured by rigorous testing procedures. The procedures shall ensure that the characteristics of the blocks are, and will remain, within the specified limits when new and throughout the anticipated life of the arresters. Samples may be selected at random by the Engineer for special tests to be agreed with the manufacturer.

All surge arresters shall be fitted with a pressure relief diaphragm which shall prevent explosive shattering of the porcelain housing in the event of an arrester failure and the arrester shall have been tested according to the high and low current tests specified in IEC 99 1.

Arresters shall be supplied complete for installation in an outdoor switchyard, including supporting structures, insulating bases and surge counters, one per phase, and, if applicable, grading rings. The material used for terminals shall be compatible with that of the conductors to which they are to be connected.

Each arrester shall be identified by a rating plate in accordance with the requirements of IEC 99 4. In addition an identification mark shall be permanently inscribed on each separately housed unit of a multi unit arrester so that units can be replaced in the correct position in the event of them being dismantled.

Surge counters shall have an internal assembly which is matched to the line discharge capability of the arrester and shall include a leakage current meter with a bi linear scale for ease of reading. Auxiliary contacts are to be provided to signal remote indication of counter operation.

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Technical Data Schedule for 132 KV and 33 Surge Arrester




Sl. No.
Item no.

Unit
Nominal System Voltage




132 kV

33 kV
1.
Manufacturer



2.
Model Number




3.
Type:



4.
Continuous operating voltage
kV rms


5.
Rated voltage
kV rms



6.
Standard nominal discharge current
kV


7.
Reference current at ambient temperature
mA


8.
Reference voltage for above
kV rms



9.
Steep current impulse residual voltage
kV pk


10.
Lightning impulse residual voltage at




5 kA
kV pk



10 kA
kV pk



20 kA
kV pk


11.
Duty Class



12.
Discharge Class



13.
Pressure relief class



14.
Nominal Diameter of resistor blocks
mm


15.
Number of resistor blocks connected electrically in parall



16.
Number of separately housed units pre phase



17.
Overall height of arrester (without supporting structure) 
m


18.
Overall height of arrester including grading ring if applicable
mm


19.
Clearances:




Phase to earth (from centre line)
mm



Phase to phase (centre line to centre line)
mm


20.
Overall height of arrester (without supporting structure) 
kg


21.
Maximum cantilever strength
Nm


22.
Maximum force due to wind (at maximum specified gust speed)
Nm


23.
Minimum creepage distance over insulator
mm

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