SVG-0.4-300KVAR-4L- Low-voltage Reactive Power Generator Cabinet

SVG-0.4-300KVAR-4L is a low-voltage Static Var Generator (SVG) cabinet for 0.4 kV distribution systems, rated at 300 kvar and connected in a three-phase four-wire configuration. Built around IGBT power modules with a voltage-source inverter topology, it delivers stepless, bidirectional reactive power, both capacitive and inductive, and regulates power factor in a closed loop. Response is fast and output is smooth, with no over-compensation or capacitor-switching oscillation, and compensation tracks the load continuously, avoiding the resonance risk and switching wear of fixed capacitor banks. The cabinet adopts a modular layout combining a controller unit, power units, filtering and protection circuits, and supports parallel operation for capacity expansion as loads grow. Over-voltage, under-voltage, over-current, over-temperature and device-fault protections are provided, together with event logging and communication with the distribution monitoring system for remote supervision and parameter setting. Typical applications include factories, commercial buildings, data centers, EV charging stations and renewable-energy grid connections where impact loads or low power factor are common, reducing line losses, freeing transformer capacity, stabilizing bus voltage and avoiding power-factor penalty charges. Capacity calculation, system design and cabinet dimension customization are available on request.

Cabinet Structure and Front Layout

The cabinet is a floor-standing, metal-enclosed unit in light grey powder-coated steel, with the

front split into separately opening upper and lower door sections so that inspection and isolation

can be carried out compartment by compartment. The upper compartment houses the incoming

moulded-case circuit breaker, phase busbars and terminal blocks, where yellow, green, red and

blue bars correspond to the three-phase four-wire (4L) system with clear phase and circuit marking.

The middle section accommodates three power modules; each module front panel has a mesh

ventilation grille, and heat is carried upward through the internal air path. A spare standard mounting

position is reserved at the bottom for later capacity expansion or for adding monitoring and filtering

units. Axial fans on the right side of the cabinet work with the door louvers to form a forced-air cooling

loop. The cabinet is rated 0.4 kV and 300 kvar, and its dimensions and cable entry direction can be

adapted to the actual switch room layout.

Internal Busbars and Secondary Wiring

Vertical busbars run through the cabinet, with red, green, yellow and blue insulated bars fixed

to insulating supports along the full height; joints are covered with heat-shrink sleeves to prevent

phase-to-phase and phase-to-earth creepage. The bars are tin-plated copper, with prepared

contact surfaces clamped by disc spring washers to keep contact resistance and temperature

rise low. Secondary control cables are routed in the wire duct on the left, fully numbered and

kept apart from the power components to limit interference with low-level signals. Relays,

contactors, terminal blocks and power supply modules are grouped on DIN rail at the right for

easy batch replacement and fault tracing. Axial cooling fans are fitted on the door interior and

at the rear to create a bottom-to-top air path, while cable entry holes and a yellow-green earth

terminal at the base ensure reliable earthing continuity.

Power Modules and Phase Busbar Connection

The three power modules are drawer-mounted in the middle section, each with a metal mesh front for heat

dissipation and its own air intake and exhaust, so servicing one unit does not interrupt the others. Four

phase busbars drop from the main busbar above and connect to the input terminals of each module in red,

green, yellow and blue phase colours; bolted joints carry torque marking lines so tightness can be judged

during inspection. Busbar joints are fitted with insulating sleeves and phase colour identification, and flexible

cables with crimped ring lugs bridge the bars and module terminals to absorb assembly tolerance and operating

vibration. Module control and sampling harnesses run in a separate duct on the left, avoiding long parallel runs

with the busbars. The layout is arranged by capacity for 300 kvar in total, with three modules operating in parallel

to provide unit-level redundancy and derated operation.

Cabinet Appearance and Nameplate

The cabinet has a symmetrical two-door front with a common lock at the centre, so

operation and maintenance are managed with a single key. Ventilation louvers and

guarded cooling fans are arranged on the upper and lower door panels to create a

front-to-rear cooling path, and the fan guards prevent foreign objects and fingers from

entering. Lifting holes and a top exhaust area are provided on the roof, and base

channel steel at the bottom allows direct fixing to the switch room floor or above a

cable trench. A black identification strip along the top of the front panel gives the model

ZR-SVG-0.4-300Kvar/4L, the cubicle number 1AA05 and the name "low-voltage reactive

power generator cabinet" for on-site identification and asset records. The powder-coated

finish resists dust and corrosion, suiting indoor distribution rooms in factories, commercial

buildings and data centres.

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