Dynamic VAR compensation uses rapid switching techniques to insert and remove capacitive reactance as demanded by dynamic loads. Many electrical loads have very rapid requirements for reactance that cannot be satisfied with traditional automatic (contactor) switching methods. These highly dynamic requirements for reactive power can only be satisfied with the most rapid switching techniques that match reactive compensation to load demand. Myron Zucker, Inc. offers a complete range of rapid switching products to provide reactive power compensation, harmonic filtering and voltage support.

ZT Capacibank and ZT Capacitrap offer the fastest VAR switching capability available. Using thyristor (SCR) soft-switching techniques, The ZT units add capacitance to power systems at zero cross points to prevent switching transients. The ZT inserts capacitance onto a system within 8-10 msecs of sensing a need for reactive compensation. That's only 1/2 to 2/3 of a cycle.

ZT Capacibank / ZT Capacitrap Switches
Fast acting thyristor switches insert and remove capacitance in as little as 5-8 milli-seconds to respond to rapid load changes. Better yet, the RSS uses soft-switching technology to provide transient free switching of capacitors.

ZT Capacibank / ZT Capacitrap Controllers
The brains behind the ZT units is the rapid sensing and rapid acting controller. The Controller makes 10,000 calculations per second to determine the reactive power demand and can control up to 24 capacitor steps.

ZT Capacitrap Reactors
When there are harmonics present on your power system, we can supply reactors to either tune or detune the capacitor network to block harmonics and to avoid power system resonance. Reactors utilize PolyGap™ core construction to minimize losses, audible noise and stray magnetic fields.

Benefits of Dynamic VAR Compensation:

• VAR compensation is directly matched to dynamic load requirements
• Facility voltage is stabilized
• Facility voltage drops are reduced
• System electrical efficiency is improved
• Harmonic distortion can be minimized
• Power factor can be maximized
• Flicker can be reduced substantially
• Release system capacity

Product Specifications:

• Power Systems: 3-phase, 3 or 4 wire
• Frequency: 60Hz or 50Hz
• System Voltage: 208, 240, 380, 400, 415, 480 or 600 volts
• Auxiliary Power: 110 to 230VAC, 50/60Hz (consumes less than 50 watts)
• Connection: Direct connection to system
• VAR Capacity: Unlimited
• VARs / switch: 25 to 100 kVARs per switch
• Response time: 10 to 12 milli seconds typical (6.67 msec best)
• Switch Rate: 1 operation per cycle maximum
• Switch Legs: 2 (switches 2 out of 3 phases, no neutral connections)
• Enclosures: Nema 1, Nema 3R, Nema 12 (others upon request)
• Storage Temperature: -30C to 60C
• Operating Temperature: 0C to 40C
• Altitude: 1000 meters
• Standards: Complies with NEMA, ANSI, UL, IEC, EIA, IEEE, NFPA requirements