Static Var Generator (SVG) for higher energy efficiency and load balancing

The EPCOS Static Var Generator PQvar makes energy more efficient by stepless power factor correction.


PQvar is a new approach to power factor correction and load balancing. The modular design and compact structure make it the ideal solution for active stepless PFC and load balancing in industrial applications and commercial buildings. Compared to conventional PFC systems, PQvar offers a response time of less than 15 ms and a dynamic reaction time of less than 50 µs. It can compensate both inductive and capacitive loads and achieve a power factor of 0.99.

By means of the Advanced Multi Controller (AMC), PQvar can be combined with conventional passive LV-compensation stages. The MV-level is covered by systems for 6 kV, 10 kV and 35 kV, with outputs of between 2000 kvar and 12,000 kvar. All modules are available for 3-phase grids with or without neutral conductors. Depending on customer requirements for output and size, the modules are designed as slide-in units for control cabinets, as wall-mounted units for LV-systems or as control cabinets for MV-systems.

The 3P3W (three phase three wire) PQvar can balance load currents between phases, the 3P4W (three phase four wire) type may additionally reduce neutral conductor currents. Therefore, PQvar is perfect solution at applications having reactive power requirements along with unbalanced loads, which is the case at e.g electricity distribution lines in rural areas, or different industrial applications.

Technical Data

Technical data and specifications

Rated voltage (range)

200 V
(173 ... 263 V)

400 V
(228 ... 456 V)

480 V
(384 ... 552 V)

600 V
(420 ... 690 V)

690 V
(480 ... 790 V)

Individual module capacity (kvar)

30, 60, 120

30, 50, 100, 200

40, 80

50, 100

60, 120

Mains frequency

50/60Hz (range: 45 ... 65 Hz)

Parallel operation

< 15 ms

Overall efficiency

> 97%

Power grid structure

3P3W / 3P4W

Current transformers

150/5 ... 10 000/5

Circuit topology

3 level

Cooling mode

Smart air cooling: 110 L/sec to 500 L/sec, depending upon the models

Target power factor

Adjustable from -1 ... +1

Cabinet mounting

Floor-mounted, wall-mounted

Communication ports

RS485, and network port

Communication protocols


Noise level

< 65 dB (depending on the model)

Protection functions

Overvoltage, undervoltage, short-circuit, inverter bridge invense, over-compensation

Operating temperature

-10 ... +40 (higher temperatures with derating)

Relative humidity

5 ... 95%, non-condensing

Protection class

IP20 (other IP classes are customizable)

Panel color

RAL7035 light grey


1500 m, 1% derating per 100 m plus 

EMC requirements

EN 6100_6_2(2005) / EN55011, GROUP1, CLASS A IEC 61000_6_2 (1999) / CISPR11, CROUP1, CLASS A

Compliance with standards

EN 50178:1997 / IEC 50178:1997, EN 50091-3 / IEC 62040-3 / AS 62040-3(VFI SS 111)


Technical Data

Hybrid PFC-Solution - SVG PQvar and classic PFC by Advanced Multi Controller (AMC)

Operating voltage

24 V DC

Compensation performance

Target PF

–1 … +1

Reactive power compensation rate

> 99% (target PF is 1)

Response time

< 15 ms

Reaction time

< 50 μs

Capacitor switching performance

Compensation method

Three-phase/ split/ mixed compensation

Capacitance coding method


Capacitor switching method

Stack/ normal/ cycle/ individual

Switching manner

Auto/ manual

External ports

RS485 port 1

Communication with SVG modules

RS485 port 2

External communication port

Network port

External communication port

USB port

Code upgrading port

Temperature detection

Measuring system’s operating temperature or ambient temperature

Fan controlling dry contact

Controlling SVC cooling fan

Alarm indicator dry contact

For reserved external alarm indicator

Control output - contact steps

Control outputs, up to 18 at most
Contact support: 120 V AC / 10 A, 220 V AC / 8 A, 400 V AC / 3 A, 110 V DC / 0.2 A, 60 V DC / 0.6 A, 24 V DC / 5 A
Level signal: 12 V DC / 30 mA

Reserved dry contact

One input / one output

Communication protocol


Protection functions

Undervoltage, overvoltage, underfrequency, overfrequency, phase failure, high harmonic voltage,SVG overload, SVG overtemperature


7” touch screen

Installation requirements

Power consumption

< 25 W

Protection class

IP41 for the front panel, and IP20 for the rear panel

Operating environment

Ambiet temperature

–20 … +60 °C


≤ 2500 m


≤ 95%

Storage temperature

–40 … +70 °C

CT ratio

150/5 … 10000/5

Product Brief: Power Quality Solutions Static Var Generator (SVG) PQvar Series

Product Overview: Capacitors and Key Components for Power Factor Correction