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The EnerVAR is a modular Active VAR generator (AVG), which utilizes a high-speed three-level inverter (IGBT) to control the reactive power flow of the system. The AVG detects the load current through the external CT and regulates the voltage by continuously absorbing or injecting the reactive power in the power system.
The voltage and current waveform produced is almost sinusoidal, achieving a near unity power factor. The switching frequency of the IGBTs provides extremely fast control resulting in very low electrical losses, less stress on the components, increasing the equipment lifetime.
The key functions of an AVG are:
Model | EnerVAR AVG | |||
Nominal Operating Voltage | 208V | 230V | 400V | 480V |
Voltage Tolerance | +15%, -20% | +10%, -20% | ||
Available Capacity Per Module* | 25kVAR | 30kVAR | 55kVAR | 65kVAR |
Phase/Wires | 3 phase 3 wires or 4 wires | 3 phase 3 wires only | ||
Nominal Frequency | 50/60Hz ± 5% (Auto Sensing) | |||
Weight, kG | ~35kG / modules | |||
Parallel Operation | Unlimited, with same or different ratings. | |||
Reactive Power (Power Factor Correction) capability | Capable of both Inductive (lagging) & Capacitive (leading) reactive power compensation, programmable to achieve the desire targeted PF | |||
Harmonics Attenuation Capability | Up to 30% of rated capacity, Programmable From 3rd to 13th harmonic orders, typical attenuation ratio 10:1 | |||
Load Balancing | Both phase to phases and phase to neutral | |||
CT Ratio | Programmable Primary Current: 200A~16000A Programmable Secondary Current: 1A/5A | |||
CT Location | Selectable Source Side: Close Loop Control Load Side: Open Loop Control | |||
Dynamic Response Time | <10ms | |||
Inrush Current | Less than rated current | |||
Maximum Heat Losses | £3% at full capacity | |||
Communication Interfaces | USB, Ethernet (TCP/IP), RS-485 (Modbus RTU Protocol) | |||
Digital I/O | 3 x Digital Outputs + 1 x Digital Input + 1 x EPO | |||
EMC Class Compliance | EN61000-6-4, EN55011, CISPR11, IEC61000-3-11, IEC61000-3-12, EN61000-6-2, EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6, EN61000- 4-8, EN61000-4-34 | |||
Harmonics Reference Standards | EN 61000-3-4 , IEEE 519-1992 | |||
Safety Standard | Complies to EN 62477-1 | |||
Design Standard | According to EN 60146 | |||
Operating Ambient Temperature | -10°C to 40°C (Up to 50°C with suitable derating) | |||
Operating Humidity | Maximum 95% RH; non-condensing |
*the current rating may be derated automatically depending on load conditions for ambient temperature higher than 40° C.
The EnerVAR is a modular Active VAR generator (AVG), which utilizes a high speed three level inverter (IGBT) to control the reactive power flow of the system. The AVG detects the load current through the external CT and regulates the voltage by continuously absorbing or injecting the reactive power in the power system. The voltage and current waveform produced is almost sinusoidal, achieving a near unity power factor.
The switching frequency of the IGBTs provides extremely fast control resulting in very low electrical losses, less stress on the components, increasing the equipment lifetime.
The key functions of an AVG are:
CT Installation
External auxiliary coupling current sensing transformers (CT) are the essential components in all power factor correction applications. The EnerVAR AVG is designed to have selective CT sensing configurations installed on Load Side or Source Side.
The compensation power electronics consisting 3-Level IGBT are housed in compact enclosed modules with speed controlled cooling fans for thermal dissipation. These rated AVG modules are equipped with live hot-plug connectors for ease of configuration and frame integration.
The compensation reactive power can be sized accordingly and gradually extended using additional AVG modules and frames. Standardizing the components ensures short delivery time and cost effectiveness.
The modular structure makes the EnerVAR AVG resilient to errors. Should a module fails, the other Modules continue to function until the error is rectified. Installation and maintenance are much easier with hot plug-in operation and front fan replacement. Reduced downtime with MTTR of less than 120 minutes.
The frame system features a hot-swappable modular design, and modules are configured seamlessly in one frame. The frame system can be parallel and supplied accordingly to various application environment, and differently Rated AVG Systems can be applied in parallel according to requirements.
Selecting the right power supply for your application is not a small task. Let our technical sales engineers guide you through the process of choosing the right solution for your needs.
Below some parameters usually required to size and select the right power supply:
Contact our team of experienced engineers to discuss your unique power conversion and backup needs. We offer a wide range of highly reliable components that can be integrated and customized to create a solution that meets or exceeds your requirements.
For power automation systems please contact us at power.systems.automation@heliosps.com.au
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