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Products
Oil Immersed AC Voltage Stabilisers
AC Voltage stabilisers supplied in robust oil filled steel tanks
For outdoor use or any installation in humid or contaminated environments. The EMO range of EM voltage stabilisers are supplied in robust oil filled steel tanks. The oil immersion of stabilisers also results in more efficient cooling and a reduction in size compared to air-cooled stabilisers. They are available in both single and three phase models. The smaller units up to 100kVA are suitable for pole mounting and are designed for use in overhead distribution networks. The three phase stabilisers normally require a neutral. But, can be supplied with a static balancing transformer for three-phase 3-wire systems.
Output voltage accuracy ± 2 % or ± 5% (as required). The accuracy is maintained over the specified input voltage range from zero to full load irrespective of power factor, frequency variations, and ambient temperature variations. For three-phase units the accuracy is maintained irrespective of input voltage balance and output load balance.
Key Features
- Fast response
- Low internal impedance capable of sustaining high surge currents
- Efficiency better than 98% with up to 99.5% on higher models
- Waveform distortion negligible with any type of load
- Full Transverse and Common Mode spike / interference suppression when required
- Stabilised Output Voltage Can be preset to any value within these ranges
- Power Factor has no effect on the performance
- Surge rating ten times the rated current up to 2 seconds. Three times up to 1 minute. Twice up to 5 minutes
- .Environment the quoted current ratings apply to ambient temperatures from –5 Deg C to +45 Deg C. Derate by 2% per each additional degree C up to 70 Deg C. Temperature stability better than 0.03% per degree C. Maximum altitude 1000m. Derate by 2.5% for each additional 500m, EM stabilisers are suitable for indoor tropical use.
- Spike Suppression. Metal oxide transient voltage suppression is fitted as standard. Additional protection can be provided to attenuate spikes and noise down to harmless levels
- Lightning Arrestors. Can be provided to protect the stabiliser and the load form the harmful effects of induced lightning strikes to the incoming supply distribution network.
- Construction, the stabilisers are enclosed in a welded sheet steel tank; all covers are lipped to prevent any ingress of moisture and are retained by stainless steel bolts. Supplied complete with lifting lugs, and pole clamp (if applicable), all finished in Dark Admiralty Grey (RAL 7031). The enclosures are fitted with the following: Oil sight gauge, free air breather tube. Porcelain bushings and earth terminal.
- Insulating Oil, an uninhibited transformer oil is used, conforming to IEC 296(’82) class 1 & 2 and BS148(’84) class 1 & 2 specification
- CE Conformity Conforms to the requirements of council directive 89/336/EEC EMC (Valid to Oct 2009) & 2008/108 EEC emissions / immunity and directive 2006/95/EC , (Formally 73.23.EEC) Low voltage directive.
- Speed of response Defined as the time taken to restore a 10% voltage variation to within 2%, these will vary 0.15 secs on smaller units to 1 sec for larger models.
- Three Phase models are normally supplied for “star” connection and require an incoming neutral. If no neutral available a static balancer will be fitted to provide an artificial neutral.
- Quality Management System. Assessed and approved to ISO 9001:2000
- Environmental Management Policy. Assessed and approved to ISO 14001:2004
| H Models | L models |
| 200 to 254 V single phase | 100 to 127 V single phase |
| 346 to 440 V three phase | 173 to 220 V three phase |
