Product category:
Batteries, chargers and circuit protection
News Release from: Watford Control Instruments | Subject: BE21 range
Edited by the Engineeringtalk Editorial
Team on 09 September 2004
Solid-state stabilisers cut AC
distortion
The advantage of true solid state, low distortion, inductive power control is offered by the BE21 range of AC voltage stabilisers and power conditioners designed and manufactured by Watford Control.
The advantage of true solid state, low distortion, inductive power control is offered by the BE21 range of AC voltage stabilisers and power conditioners designed and manufactured by Watford Control These innovative products help overcome the problems associated with conventional solid state tap changers, where voltage spikes or current surges can potentially damage power semiconductors in the supply lines
This article was originally published on Engineeringtalk on 12 Oct 2004 at 8.00am (UK)
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Stabilisers ensure undistorted mains
Sales of EMS/E15 Series AC voltage stabilisers from Watford Control are rising rapidly, with over 200 sold since the introduction in 2003.
Stability for single- and three-phase supplies
Watford Control reckons it provides leading-edge design with its EMS range of electronic servo AC voltage stabilisers and power conditioners.
The company has just completed an order for a 1550A solid state stabiliser, rated at 186kVA single phase (558kVA three phase), representing the largest unit the company has produced to date.
The twin transductor principle of solid state control (ie eliminating moving parts or semiconductors in the main power circuit) has been adopted.
The exceptional reliability that has been achieved is proving particularly popular with customers that use performance critical electrical equipment such as hospitals, factories, commercial offices and financial institutions.
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The BE21 range is thought to offer the widest solid-state choice available on the market today.
Over 200 models provide output ratings from 0.36 up to 600kVA, single or three phase, incorporating full transient noise and spike suppression as standard, and all at prices up to 30% less per kilovolt-ampere compared with previous BEN and BEW ranges.
The increasing success of these rapid response, high efficiency (94-96%) products is thanks to their innovative principle of operation.
A twin transducer assembly forms a potential divider across two taps of an auto-transformer, one side of which is connected to the load, the other to the incoming mains supply.
A stable reference voltage is used to monitor the output voltage across the load using a solid-state amplifier.
Any error voltage is amplified and coupled to the control windings of the transductors.
This alters the voltage across the load and reduces the error to zero.
Irrespective of frequency variations and temperature fluctuations (-15 to +45C), output voltage accuracy of +/-0.5% can be maintained over the full range of voltage variations from zero to full load, while three phase stabilisers will also maintain the accuracy of the individual phases, line to neutral, even if the load and input voltage are unbalanced.
Other key features include negligible waveform distortion, correction times as low as 0.06s for three cycles, surge rating from ten times the rated current (2s) up to twice the rated current (300s), and audible noise level of just 40dB at 1m distance.
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