Guide Voltage Stabilizer Specification
Ashley-Edison - SESL-H-3P - April 2013
Ashley-Edison (UK)
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GUIDE SPECIFICATIONS
for
SESL THREE PHASE H SERIES
AC VOLTAGE STABILISERS & REGULATORS
1.0 General
This specification covers the electrical aspects for an AC Voltage Stabiliser that shall provide automatically stabilized and regulated power to sensitive electrical and electronic equipment.
The Stabiliser should be based on the Servo Electronic design principle comprising a transformer having its secondary winding connected between the mains supply and the load. The primary voltage should be automatically controlled through a servo motor driven variable transformer, thereby ensuring a continuous, smooth (step-less) and very stable output voltage.
A solid state Servo-Amplifier should continuously monitor the output voltage of the Stabiliser. Should, due to an incoming voltage or load current change, the output voltage deviate from the required value, the Amplifier sensor should instruct the servo motor to rotate the brush-gear on the variable transformer to correct the output for the deviation. The speed of detection and actions of the servo system should be exceptionally fast, with controlled motor deceleration to minimise any possibility of overshoot.
The AC Voltage Stabiliser is to be an Ashley-Edison (UK) SESL-H-3P Series model, or approved equal of similar high quality and offering similar comprehensive features and warranty options.
2.0 Standards Compliance
All units shall be designed, manufactured and supplied to comply with leading international standards in accordance with the most recent editions of the following codes and standards:
· EMC Conformance: Complies with BS EN 55022 and the relevant parts of the BS EN 61000 series of standards
· CE Conformity: CE Marked - being fully compliant with European Union Directives 2004/108/EC (The EMC Directive) and 2006/95/EC (The Low Voltage Directive)
· Construction: Enclosures to NEMA 1 Style (IP20) Ingress Protection - BS / EN / ISO 60529
· Quality: Manufactured under a BS / EN / ISO 9001: 2008 accredited Quality System, with Environmental Management policies and procedures being in general accordance with those laid down in BS / EN / ISO 14001.
3.0 Environment
3.1 Temperature
The system shall be required to operate within specification in an ambient temperature range of -15°C to +45°C.
3.2 Humidity
Relative humidity of 0 to 95% non-condensing.
3.3 Altitude
Sea level to 1000 meters above sea level.
3.4 Audible Noise
Maximum allowable noise level shall not exceed 50dB when measured at 1 meter from the unit.
3.5 Cooling
Designed for natural air convection cooling.
4.0 Basic Electrical Characteristics
4.1 Input Power
4.1.1 The nominal AC input voltage rating of the system shall be 380/220V or 400/230V or 415/240V [Select one of three options as appropriate] AC, Three Phase, 4 Wire (3 Phase + Neutral + Ground/Earth) 50 or 60 [Select one of the two options as appropriate] Hertz.
4.1.2 A grounding terminal shall be provided for one parity sized grounding conductor.
4.2 Output Power
4.2.1 The AC Voltage Stabiliser’s continuous duty output power rating requirement should be ______[Please Specify] KVA.
4.2.2 The output voltage of the system shall be 380/220V or 400/230V or 415/240V [Select one of the three options as appropriate] AC, Three Phase, 4 Wire (3 Phase + Neutral + Ground/Earth) 50 or 60 [Select same option as selected above in 4.1.1] Hertz.
4.3 Line Voltage Regulation
Please Select one of the three output voltage accuracy options available below]
4.3.1 The Voltage Stabiliser shall provide an output voltage within + 0.5% of specified output voltage when the input voltage is between ±15% or ±20% or ±25% or ±30% or ±35% or ±40% [Please Select one of the six swing options available] of nominal.
4.3.1 The Voltage Stabiliser shall provide an output voltage within + 3% or better of specified output voltage when the input voltage is between -17%/+18% or -22%/+23% or +27%/+28% or -32%/+33% or -37%/+38% or -42%/+43% [Please Select one of the six swing options available] of nominal.
4.3.1 The Voltage Stabiliser shall provide an output voltage within + 5% or better of specified output voltage when the input voltage is between -19%/+21% or -24%/+26% or -29%/+31% or -34%/+36% or -39%/+41% or -44%/+46% [Please Select one of the six swing options available] of nominal.
5.0 Performance Specifications
5.1 Standard Features Required
5.1.1 Cost-Efficient Servo Electronic Design - Cost effective compact servo electronic based design with extremely high reliability (MTBF >125,000 Hours), long-life expectancy and offering an exceptionally low level of annual / biennial ongoing maintenance requirements - being deliverable by universally available skill sets held by most competent electricians.
5.1.2 TVSS - Transient Voltage Surge & Spike Suppression Protection against damaging voltage spikes and transients.
5.1.3 Fault Tolerant Regulation Control - Parallel Redundant Voltage Regulation Control Modules (VRCM) will be fitted on each phase of the Stabiliser. Should one Module (VRCM) fail or malfunction, the other parallel Module will operate automatically without causing interruption to the load and also without affecting capacity. In other words, should one of these Control Units malfunction or fail, the Voltage Stabiliser will operate at 50% swing without affecting the Stabiliser’s operation. The other two phases which are not affected, will still regulate independently as per normal, at 100% swing.
5.1.4 Independent Phase Control - The Voltage Stabiliser shall maintain each phase voltages stable irrespective of load unbalance, even up to 100% load unbalance
5.1.5 Response Time - Response time shall be less than 1.5 milliseconds.
5.1.6 Correction Time - A 10% supply variation shall be corrected to within 2.5% in 0.6 seconds.
5.1.7 Output Impedance - The output impedance shall be typically 3%.
5.1.8 Operating Frequency - shall be 47 to 65 Hertz
5.1.9 Harmonic Distortion - Less than 1% THD shall be added to the output waveform.
5.1.10 Efficiency - The Voltage Stabiliser shall have an efficiency of 98% or greater.
5.1.11 Soft Switch-On / Start Up Load Protection – protection of the load equipment from damaging start up voltage surges by ensuring that the output voltage is set at minimum upon Switch-On before commencing stabilisation.
5.1.12 Overload Rating - Ability to support electrical and electronic equipment with inherent initial high current draws on start up. The overload rating for the voltage stabiliser shall be no less than 10 times the maximum current rating for 2 seconds, 3 times the maximum current rating for 1 minute and 2 times the maximum current rating for 2 minutes.
5.1.13 Power Module Protection - Protection of the variable transformer power modules shall be provided to safeguard against excessive wear on the brush gear.
5.1.14 Bypass Control Switch - Ability to bypass the inbuilt electronic controls circuitry to provide power to the load via the power stacks.
5.1.15 Under and Over Voltage Alarm - Front Panel status alarm in the event that the incoming voltage supply goes outside the input voltage window of the Stabiliser..
5.1.16 Front Panel Status Monitoring - Front Panel display showing basic system status.
5.1.17 Voltmeter & Ammeter – front panel mounted analogue meters with phase selector monitoring output voltage & current.
5.1.18 Remote Operational Status Monitoring – No Volt Contacts delivering basic operational system status information for use by remote monitoring / building management systems.
5.2 Additional Add-On Features Required [Delete section or sub-sections below if not required]
5.2.1 Inbuilt Full Manual Maintenance Bypass Facility – ‘Break Before Make’ inbuilt / integrated bypass facility offering the ability to route the supply feed to bypass the Stabiliser.
5.2.2 Output Circuit Breaker – A molded case, thermal magnetic, output circuit breaker provided as an integral part of the unit - delivering over current output protection.
5.2.3 Lightning Surge Protection – Protection against extremely high voltage surges and transients as typically caused by lightning strikes on the supply line.
5.2.4 Frequency Meter – front panel mounted analogue meter monitoring frequency.
5.2.5 Remote Operational Status Monitoring – No Volt Contacts delivering basic operational system status information for use by remote monitoring / building management systems.
5.2.6 Comprehensive Digital Power Metering & Monitoring – Microprocessor based digital output power metering - monitoring V, A, W, VAR, PF, W Hrs & VAR Hrs and offering additional RS-485 output.
5.2.7 Under and Over Frequency Protection - Ability to shutdown automatically the Voltage Stabiliser in the event of the Frequency going outside pre-set limits.
5.2.8 Phase Failure Protection - Any failure of phases on the three phase supply will be immediately detected and the Stabiliser will automatically power down to protect the load side equipment.
5.2.9 Internal Heater – Thermostatically controlled internal heater fitted to accommodate sub-zero environments.
5.2.10 Internal Anti-Condensation Heater – internal low wattage heater designed to prevent condensation.
5.2.11 AquaStop Protective Coating – offering protection of the electronic PCB assemblies against damp and moisture ingress.
5.2.12 IP21 Ingress Protection – additional drip proof cowl increasing protection of the standard IP20 / NEMA 1 style enclosure to IP21.
5.2.13 Main System Switchboard – MSB System Switchboard with inbuilt bypass facility for use with the Stabiliser.
6.0 Enclosure / Cabinet
6.1 Construction
The stabilizer should be enclosed in an IP20 (NEMA 1 style) robust steel floor standing cubicle with door access for ease of installation and service. Lifting eyebolts should be provided to assist handling during transportation and positioning.
6.2 Paint Colour
RAL 7032 (Grey – Epoxy Powder Coating)
6.3 Cable Entry
Bottom cable entry unless requested to the contrary.
7.0 Warranty
As standard the stabilizer will be provided with a 3 year warranty, extendable to 5 years by purchasing an extended warranty.
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