MV Equalizer

Real Time Dynamic Compensation at Medium Voltage

Elspec MV Equalizer is a high-performance solution for stabilizing dynamic medium voltage networks. Designed for environments with rapid and extreme fluctuations in reactive power, it delivers real-time compensation for reactive power, harmonics, voltage drops, and flicker—all in less than one cycle.

Using advanced thyristor switching technology with zero-crossing connection, the system ensures smooth, transient-free operation. Equipped with patented PQZIP™ technology and multiple Digital Fault Recorders (DFRs), the MV Equalizer offers precise control, continuous waveform recording, and built-in I²t protection.

Its unmatched speed and efficiency make it one of the most effective and reliable solutions for grid stability and power quality on the market today.

Description

Elspec Medium Voltage Equalizer is a fast-response power quality system designed for dynamic loads with rapidly changing reactive power demand. It delivers real-time compensation—within less than one cycle—for reactive power, harmonics, voltage drops, and flicker, helping to maintain grid stability and power reliability.

At its core is a high-power thyristor switching system that connects capacitors at zero-crossing, ensuring smooth, transient-free operation. Installing the Equalizer at one or multiple points across the network significantly improves voltage stability and reduces the risk of equipment downtime caused by power fluctuations.

With exceptional efficiency and low energy losses, the MV Equalizer stands out as one of the most effective compensation solutions on the market. Each system is tailor-made to meet the specific requirements of the customer, with configurations available up to 115 MVAr for both indoor and outdoor installations.

Typical applications:
– Water Utility’s (water pumps)
– Unbalanced Rapid Loads
– Arc Furnaces
– Wind Farms
– Wood Chippers
– Welding Operations
– Car Crushers & Shredders
– Industrial Mills
– Mining Mills, Shovels and Hoists
– Harbor Cranes

Specifications

MV Equalizer
Manufacturer ELSPEC
Enclosure Type Indoor or Outdoor
System Size Up to 115MVAr
Switching Thyristor Valve
Nominal voltage Up to 22kV
Phase & Frequency 3Ph, 50/60Hz
Design Ambient Temperature (Elec. Room) Indoor/Outdoor : 5 ~ 40 deg. C
Design Relative Humidity Max.95%
System Losses ≤0.8%
Protection Degree IP54 mounting 20FT container or IP21 Indoor
Bus material Copper
Thyristor Valve Panel
No of Valves per group Wye: 3 (1 per phase), Delta 2
Valve continuous current 150A without cooling, 250A with direct cooling fan
Valve rated short time current carrying capacity & duration 4000Amp during 10mSec
Valve Connection / disconnection Transient free, switching for connection and disconnection one or several groups. Swithching during current zero crossing., with no limitation for number connections.
Acquisition time (full compensation to required PF) One cycle full compensation within 16.6mSec on 60Hz and 20mSec on 50Hz networks
PF Rated continuous current 1.3 x In per capacitor groups
Power frequency withstand voltage (kV) According With IEC 61936-1:2021
For 3.6kV (Um) – 10kV
For 7.2kV (Um) – 20kV
For 12kV (Um) – 28kV
For 17.5kV (Um) – 38kV
For 24kV (Um) – 50kV
1.2/50 micosec.impulse volt withstand (kV) According With IEC 61936-1:2021
For 3.6kV (Um) – 40kV
For 7.2kV (Um) – 60kV
For 12kV (Um) – 95kV
For 17.5kV (Um) – 95kV
For 24kV (Um) – 125kV
Capacitors
Capacitors rated maximum voltage 1.1 UN 12 Hours Per Day
1.15 UN 0.5 Hour Per Day
1.2 U 5 Minutes / 200 Times
1.3 U 1 Minute / 200 Times
Capacitors peak Current 100In
Reactors
Reactors core type DRY TYPE
Reactors Winding Enmmeled copper wire
Reactors Terminals Copper bar
Reactors Core Silicon steel
Reactors Isolation class class H, 180C°
Detuned factor 7% / 14%
Linearity 1.8 In
Noise ˂65db
Altitute 1000 Meter
Resonance frequency with capacitor bank (Hz) 50Hz – 189Hz, 60Hz – 227Hz
Protection features and indication
Unit protection DIGITAL RELAY with VCB / P.F
Indication for ON/OFF condition of capacitor On controller LCD screen
Trip Interlock for accidental opening of capacitor room Integral
Standards IEC 62271-1, IEC 62271-200, IEC 60871-1-2014, IEC/EN60076-6, EN61558-2-20, IEC 61936-1:2021, IEC60044-1, GB20840.1-2010, GB20840.2-2014
Safety: ENA61010-1, ENA60439-1, UL-508
EMC: EN50081-2, EN50082-2,EN51000-4-2/3/4/5, ENV50204,ENV50141
LV Control Panel
EQ Controller (G3)
Response Time Real Time full compensation with acquisition time od 1 cycle maximum
Elspec Digital Fault Recorder No’ 1
General One year cycle by cycle contineus waveform recording of all three phases (mains, load, and capacitors)
Standards Refer to Multi Functional recording specification
Scada Refer to Management software specification
Elspec Digital Fault Recorder No’ 2
General One year cycle by cycle recording of all three phases on each group. I²t equivalent protection for each thyristor vlave (two phases on each group)
Standards Refer to Multi Functional recording specification
Scada Refer to Management software specification

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Applications

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Metal Welding & Plastic Injection

Stabilize voltage, improve weld quality, reduce raw material waste, equipment downtime, and cleanup costs in fast-changing, high-load environments.

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Water Utility Pumps

Ensure stable voltage and efficient pump operation by compensating for rapid load changes and preventing power quality disturbances.

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Food Processing & Packaging

Maintain process stability and product quality by eliminating voltage fluctuations, reducing downtime, and ensuring reliable operation.

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Port Cranes

Stabilize voltage, reduce current draw, and minimize system losses to enable smaller installations and significant energy savings.

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