Specifications

For connection between a conductor of an electrical system and ground to limit the magnitude of transient overvoltages on equip.

 

Brief Introduction:

 

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.

 

 

 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.

 

MO varitor:

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.

 

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.

 

 

 

 

More Photos & Drawing:

 

 

  

More photos:

 

 

 

USING CONDITON:

Ambient temperature: -40°C ~+40°C

2Altitude: above 1000m

Frequency: 48Hz ~ 62Hz

The power frequency voltage of the arrester should be less than the continuous operating voltage

Maximum wind velocity: 35m/s

Earthquake intensity: ≤ 7 degrees

Standards:

Typical types of 0.22KV to 220KV polymer housed metal oxide surge arrester (YH series) is in accordance with standards IEC60099-4, GB11032-2000 & T8952-2005.

Summeray:

YH series metal oxide surge arresters are used to protect 0.22KV to 220KV A.C. system against overvoltage damage. We can design and develop surge arresters according to your request.

Test:

DC reference voltage test

leakage current test under 0.75 U1mA

Partial discharge test

Sealing test

Continuous current test

Power frequency withstand voltage test at resistant current 1mA

Residual voltage test at nominal discharge current

 

 

 

Safety and reliability are vital in high-voltage products and Wenzhou Mingneng Electric Co., Ltd is committed to pioneering improvements in performance for our customers at all levels. Our development teams work to generate a superior range of high performance products. All products developed using our extensive service experience and within the constraints of international standards including IEC and many national standards.