● Ultra-light main unit at only 3.5 kg
● Built-in Replaceable Battery Design
● 0.05% High Accuracy
● IEC 60044-1, IEC 60044-6, IEC 61869-2, ANSI 30/45, IEEE C57.13 standard
● Low-voltage variable frequency testing, automatic CT error testing, multi-function measurements, nameplate guessing function, etc.
The KT220 is a complete testing system for protection and metering CTs according to IEEE and IEC standards. It allows all types of single and multi-ratio current transformers to be tested on-site in power system grids.
The KT220 offers a wide range of measurements, including:
● CT-ratio and phase-angle accuracy with consideration of nominal and operational burden for various currents
● CT winding resistance
● CT excitation / saturation (unsaturated and saturated)
● ALF and FS (direct and indirect)
● Burden impedance
● CT residual magnetism
● PT ratio, polarity and excitation curve
Auto Demagnetizes
● Software-based tool to determine the residual magnetism in current transformers
● Analysis of the remanence condition before putting into operation the CT to assure proper function
● Simplifies power grid failure analysis after unwanted operation of protective relays
● Demagnetizes the CT core after measurement
PC Control Available
● Full access to all functions of the KT220 via a PC using the RJ45 interface
● Optimizes the integration into automated testing procedures in production lines
● Data export into Word
● Customizable testing and reports
Data Handling and Reporting
● Test reports can be saved on the host and transferred to a PC
● Data and protocols can be shown on a PC via the Word file loader program
"Guessing" Nameplates（Reference for unknown CT）
● Determination of unknown CT data
● Older CTs can be classified and put into service without contacting the manufacturer
● Determinable parameters include:
CT type
Class
Ratio
Knee point
Power Factor
Nominal and operating burden
Secondary winding resistance
Technical Features Standard Package
● Excellent noise immunity to disturbances from energized power lines close to the measurement
● CT ratio and phase measurement with consideration of nominal and connected secondary burden; CT ratio up to 10000:1
● Knee-point voltage from 1 V up to 30 kV can be measured
● Currents from 1% up to 400% of the rated value
● Different burdens (full, ½, ¼, ⅛ burden)
● Determination of ALF/ALFi and FS/FSi, Ts, and composite error for nominal and connected 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 (3.5 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
● Easily adaptable reports (customizable)
● Automatic assessment according to IEC 60044-1, IEC 60044-6, IEC 61869-2, ANSI 30/45, IEEE C57.13
● 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
Current Ratio Accuracy | |
Ratio 1 - 5000 | 0.02% (typical) / 0.05 % (guaranteed) |
Ratio 5000 - 10000 | 0.03% (typical) / 0.05 % (guaranteed) |
Winding Resistance | |
Range | 0.1 - 300 Ω |
Resolution | 1 mΩ |
Accuracy | 0.05 % (typical) / 0.1 % + 1 mΩ (guaranteed) |
Phase Displacement | |
Resolution | 0.01 min |
Accuracy | 1 min (typical) / 3 min (guaranteed) |
Output | |
Output Voltage | 0 Vac to 120 Vac |
Output Current | 0 A to 5 A (15 A peak) |
Output Power | 0 VA to 250 VA (750 VA peak) |
Power Supply | |
Nominal Volume | 10.8V, 2x47.52Wh (4500mAh) |
Power Input | Type-C, PD3.0, 20V/3.25A, 20V/5A |
Operating Temperature | Charge: 0 to 45°C (Ambient) Discharge: -20 to 60°C (Ambient) |
AC Charger Input | 100 Vac to 264 Vac, 47 Hz to 63 Hz |
Physical Dimensions | |
Size (W x H x D) | 288 x 185 x 95mm |
Weight | <3.5 kg (without accessories) |
Environment Conditions | |
Operating Temperature | -10°C up to + 55°C |
Storage Temperature | -25°C up to + 70°C |
Humidity | Relative humidity 5% up to 95% not condensing |
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