Transformers analyzer AKT-200 CT/PT

KT200 is designed for the Protection CT and Metering CT complete test, and partial PT test

Main characteristics

• Modular design of plug-in architecture for convenient customer site maintenance
• One-step test determining all parameters (<3 min), Automatic test winding resistance, Excitation, saturation, CT ratio, etc...
• Automatic assessment to IEC/ANSI standard and integrated report functionality
• Test CT knee point voltage up to 30KV
• High ratio measurement up to 50,000:1
• Compiling of IEC60044-1, IEC60044-6 and ANSI30/45, etc
• Lightweight, <10Kg
• Mobility, Accuracy, Safety and Handling
• “Guessing” Nameplates, determination of unknown CT data

Purpose

• Ratio (up to 50000 : 1)
• Current ratio error and phase error for all measurement points defined in selected standard
• Winding resistance
• Excitation/saturation voltage current
• Secondary burden
• Saturated inductance (Ls)
• Unsaturated inductance (Lm)
• Remanence flux factor (Kr)
• Secondary time constant (Ts)
• Accuracy limiting factor (ALF / ALFi)
• Instrument security factor (FS / FSi)
• Dimensioning factor according to class PX, TPS (Kx)
• Accuracy limiting voltage/current according to class PX (Ek / Ie)
• Turns ratio according to class PX (N)
• Turns ratio and composite error (εt ,εc)
• Rated symmetrical short-circuit current factor (Kssc)
• Transient dimensioning factor (Ktd)
• Peak instantaneous error (ε^)
• Maximum emf voltage (Emax - calculated value)
• Accuracy limiting voltage/current (Val/Ial)
• Knee-point voltage/current (Vkn / Ikn)
• The impedance / admittance of CT secondary Load, Like the burdens of various meters, relays, selector switches etc. are measured
• Data Handling and Reporting
• Determination of unknown CT data, Older CTs can be classified and put into service without contacting the manufacturer

Characteristics

• Excellent noise immunity to disturbances from energized power lines close to the measurement
• Determination of ALF/ALFi and FS/FSi, Ts, and composite error for nominal and connected burden
• CT ratio and phase measurement with consideration of nominal and connected secondary burden
• Currents from 1% up to 400 % of the rated value
• Different burdens (full, , ½, ¼, ⅛ burden)
• CT winding resistance measurement
• CT excitation curve (unsaturated and saturated)
• Saturation characteristic recording
• Direct comparison of excitation curve to a reference curve
• CT phase and polarity check
• Secondary burden measurement
• Automatic demagnetization of the CT after the test
• Small and lightweight (< 10 kg)
• Short testing time due to fully automatic testing
• High level of safety using patented variable frequency method (max. 120 V)
• “Nameplate guesser” function for CTs with unknown data
• PC control interface
• QuickTest: Manual testing interface
• Color display readable in bright sunlight
• Simulation of measured data with different burdens and currents
• Knee-point voltage from 1 V up to 30 kV can be Measured
• Automatic assessment according to IEC 60044-1 or IEC 60044-6
• Automatic assessment for accuracy class > 0.1
• Measurement of transient behavior of TPS, TPX, TPY and TPZ type CTs
• PT ratio, polarity and excitation curve according to IEC60044-2