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GRIDVAR-C
Compact Series

Three-level NPC power stage. Stepless reactive power compensation and phase balancing. Module ratings 30 – 150 A, 88 mm module height (30, 50 and 75 A). Built for retrofit and space-constrained industrial installations.

30 – 150 A Stepless reactive compensation ≤ 10 ms response ≥ 97.5% efficiency
88 mm height, drawer / wall / vertical
Reactive power & phase balancing
Up to 20 modules / cabinet
≤ 10 ms response time
Active Power Quality

Compact static var generator
rated in amperes

GRIDVAR-C is the compact static var generator (SVG) of the GRIDVAR family. It is meant for retrofit projects, motor control centres (MCC) and installations where cabinet space is short.

GRIDVAR-C is rated by the current it can supply. It comes in five ratings: 30, 50, 75, 100 and 150 A. The 30, 50 and 75 A modules are 88 mm high and slide into an existing switchboard frame as a drawer cassette; the 100 and 150 A modules are 100 mm.

Its primary function is reactive power compensation and three-phase balancing. The same power stage can also filter harmonics (orders 2 to 50) to the extent of its remaining capacity; this is not its primary function and it may not reach the performance of a dedicated AHF. The share of module current given to each task is set in software. Where dedicated harmonic filtering is required, GRIDSINE-C is ordered.

30 – 150 A Reactive + balancing ≤ 10 ms ≥ 97.5% efficiency Retrofit ready
GRIDVAR-C module, view 1 GRIDVAR-C module, view 2 GRIDVAR-C module, view 3 GRIDVAR-C module, view 4
88 mm
Module height
(30, 50 and 75 A)
20
Modules in parallel
per cabinet max.
≤ 10 ms
Total response time
to load changes
50th
Highest harmonic order
(secondary function)
Technical Specifications

GRIDVAR-C Specification

Values from the GRIDVAR-C product documentation.

ParameterSpecification
SUPPLY
Product seriesGRIDVAR-C — Compact Static Var Generator (SVG)
Circuit topologyThree-level NPC
Rated voltage400 V AC
Input voltage range−20 … +20%
Nominal frequency50 / 60 Hz (−10 … +10%)
Wire system3P3W / 3P4W
PERFORMANCE
Module ratings30 A · 50 A · 75 A · 100 A · 150 A
FunctionReactive power compensation (SVG) and phase balancing. The same power stage can also filter harmonics within its remaining capacity — the share given to each task is set at commissioning. Dedicated harmonic filtering: GRIDSINE-C.
Harmonic range2nd … 50th — each order individually selectable
Cancellation ability> 95% (at rated load)
Response time≤ 10 ms
Overload capacity110% continuous · 120% for 1 min
System efficiency≥ 97.5%
Power factor controlInductive or capacitive, 0 … 100%
Load balancing100% compensation of unbalanced load
SYSTEM
Modules in parallel20 modules
RedundancyAny module can operate stand-alone
CT connectionOpen or closed loop — open loop recommended when paralleled
Between modulesCAN, RJ45
FieldbusRS485 / CAN · Modbus RTU
CoolingForced fan cooling, speed controlled by output current and temperature
ENVIRONMENT
Ambient temperature−25 … +55 °C (derating above 45 °C)
Storage temperature−45 … +70 °C
Relative humidity5 … 95% RH (non-condensing)
Altitude1 500 m (derating above)
Noise level< 56 … < 69 dB (depending on module and load)
Degree of protectionIP20
COMPLIANCE
Safety standardEN 62477-1:2012 + A11:2014 + A1:2017 + A12:2021
EMC immunity and emissionEN IEC 61000-6-2:2019 · EN IEC 61000-6-4:2019
MarkingCE
Key Features

88 mm modules, 20 per cabinet, orders 2 to 50

88 mm module height

The 30, 50 and 75 A modules are 88 mm high; the 100 and 150 A modules are 100 mm. They fit into existing MCC frames and switchboards as a drawer cassette, without structural modifications.

Up to 20 Modules in One Cabinet

Rack-type parallel connection allows up to 20 GRIDVAR-C modules in a single cabinet. Multiple cabinets can be paralleled for larger projects. Total cabinet capacity depends on selected module sizes.

Harmonic Filtering Within Spare Capacity

Within the capacity left after reactive compensation, GRIDVAR-C can also filter orders 2 to 50. Each order is enabled or disabled in software. For dedicated harmonic filtering, GRIDSINE-C is the right module.

≤ 10 ms Response Time

Harmonic and reactive demand is tracked continuously and the output follows within ≤ 10 ms. That covers crane drives, welding machines and similar fast-changing loads.

Software-Configurable Priority

Reactive compensation, 3-phase balancing and harmonic filtering each get a priority weighting. Module current goes to the task ranked highest.

Every module can stand alone

Any GRIDVAR-C module can operate stand-alone. If one module drops out, the remaining modules keep working. The installation does not stop. Modules communicate over CAN and RJ45.

Installation Flexibility

Drawer, wall or vertical cabinet

Drawer (Rack)

Slides into a standard switchboard frame. Used for new panels and MCC retrofits.

  • 88 mm module height (30, 50 and 75 A)
  • Fits standard 600 mm deep cabinets
  • Side-by-side stacking for high capacity
  • Hot-swap live module exchange

Wall-Mounted

Direct wall installation for decentralised compensation close to the load point.

  • No separate cabinet required
  • For transformer room installations
  • No floor space taken
  • Easy access for service
  • Suitable for individual feeder compensation

Vertical Cabinet

Floor-standing vertical configuration for standalone active compensation panels.

  • Forte-fabricated complete panel
  • Integrated main breaker and fusing
  • Custom capacity to project requirements
  • Factory Acceptance Test (FAT) included
  • Ready for site installation
Module Variants

Five module ratings

All GRIDVAR-C modules share the same platform. Choose the rating from the current your measurement calls for; modules are paralleled to reach the total current required.

30
A
Height88 mm
Size (W×H×D)230 × 88 × 400
Weight7,5 kg
MountingWall
50
A
Height88 mm
Size (W×H×D)440 × 88 × 425
Weight14 kg
MountingRack / wall
75
A
Height88 mm
Size (W×H×D)440 × 88 × 425
Weight16 kg
MountingRack / wall
100
A
Height100 mm
Size (W×H×D)500 × 100 × 550
Weight29 kg
MountingRack / wall
150
A
Height100 mm
Size (W×H×D)500 × 100 × 550
Weight31 kg
MountingRack / wall

All modules: 400 V AC · 3P3W / 3P4W · IP20 · EN 62477-1 · EN IEC 61000-6-2 / -6-4

Hybrid Compatibility

SVGC: GRIDVAR-C added to a GRIDFIX bank

A GRIDVAR-C module added to an existing GRIDFIX bank covers the dynamic part of the load that fixed steps cannot follow.

Existing Infrastructure

GRIDFIX LC Stage

The existing thyristor-switched capacitor/reactor stages keep carrying the base load. Nothing is replaced.

Add GRIDVAR-C

SVGC Hybrid Result

GRIDVAR-C compensates the dynamic residual demand steplessly, filling the gaps between the LC steps.

New Capability

GRIDVAR-C Module

Compensates fast-changing loads and the gaps between LC steps, and corrects phase imbalance, which passive stages cannot do.

Applications

Applications: retrofit and tight electrical rooms

MCC Retrofit

Replaces outdated capacitor bank stages in Motor Control Centres. The drawer cassette fits the existing frame without structural modifications.

Commercial Buildings

Tight electrical rooms with no space for a new switchboard. Wall or drawer mounting puts the module where a standalone cabinet cannot fit.

Iron & Steel

Rolling mills and auxiliary drives where fast stepless compensation is required but a full GRIDVAR-X investment is not yet justified.

Data Centres

UPS input stages and server-room PDUs. Stepless power factor correction and phase balancing; for dedicated harmonic filtering, GRIDSINE-C.

Send your power quality measurement and frame dimensions. We pick the module rating and the mounting.

Module rating, mounting type and cabinet layout follow from the measured reactive and harmonic demand.

Documents

Technical documents for this product. Ask for a document still in preparation and we will send it as soon as it is ready.

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