5KV Polymer Lightning Surge arrester

Specifications

This surge arrester is used to protect distribution equipment from being damaged by atmosphere over-voltage and operating over-voltage.

NO.1 Brief Introduction:

Lightning arrester (surge arrester) housed in porcelian and polymer housings, is developed to protect switchgear, overhead lines, transformers, and other equipment against atmospheric or a system-immanent over-voltage.

In medium-voltage distribution systems the arresters are widely spread over the whole network as they are normally directly arranged either, for instance, at the pole-mounted transformers, or at the cable terminations.

 NO.2 Construction:

Certain designs of the polymer housed arresters were in fact impossible to construct until the gapless metal-oxide technique was introduced. As a major progress, metal oxide arresters could be built with only one single effective active element, namely the column of the metal oxide resistors. High demands are, however, made on these metal oxide resistors, as they combine all the functions, which previously had been shared among the different components of the gapped arrester. In this way they have to be ageing resistant while being subjected to constantly applied operating voltage. They must be able to absorb the energy injected during a discharge, and they should subsequently limit the follow current (leakage current) to value small enough for thermally stable operation.

The metal oxide resistor column, together with the accompanying supporting construction comprises the active part of the arrester. The column consists of individual metal oxide resistors stacked on top of each other. The metal oxide resistors are almost always produced in a cylindrical form. Their diameter decisively determines the energy absorption and the current carrying capability. It is within a range of about 30mm when used for distribution systems and up to 100mm or more for high and extra-high voltage systems and special applications, for which high energy absorption capabilities are required.

NO.3 Characteristics:

1. Non-tracking and low erosion rates in polluted an non-polluted environments, long term weather ability,
2. resistance to thermal ageing,
3. UV resistance,
4. chemical resistance.
5. Tough, tear and impact resistance.

NO.4 Technical Parameters:

1) Sys R.V :3 KV(r.m.s)

 2) MOA R.V :5 KV(r.m.s)

 3) MCOV : 4.0 KV(r.m.s)

 4) D.C.U1mA ≥8.0

 5) 1/10 μs steep current impulse ≤17.3KV

 6) 8/20 μs lighting current impulse ≤15KV

 7) 30/60 μs switching current impulse ≤12.8KV

 8) 2ms rectangular current impulse withstand:90A

 9) 4/10μs high current impulse withstand:65KA

NO.5  Normal service conditions:

1.The ambient air temperature is no higher than +40 degree. no lower than -40 degree.

2.The altitude above sea level does not exceed 2000m

3.Power frequency 48Hz~62Hz

4.Maximum wind speed does not exceed 35m/s

5.The earthquake intensity does not exceed 7 degrees

6.The voltage that long-time exerted shouldn't exceed its Max MCOV

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