The KDHG-220P Variable Frequency CT/PT Comprehensive Tester is a next-generation instrument for current and voltage transformer testing, developed through extensive research and user feedback. It integrates high-performance DSP and ARM processors with advanced manufacturing technology, ensuring stable and reliable performance, comprehensive functions, high automation, and efficient testing.

Based on the low-frequency test principle, it can output up to 180V AC voltage and 12Arms (36A peak) AC current, enabling testing of CTs with inflection points up to 65kV. The tester features a user-friendly 5.7-inch graphical transflective LCD display, supports one-click testing for CT DC resistance, excitation, ratio, and polarity, and can store up to 2000 groups of test data. It fully complies with international standards such as IEC60044-1 and IEC60044-6, making it a professional solution for the power industry.

• Comprehensive Functionality: Supports testing of various CT types (protective, metering, TP) and protective PT, covering excitation characteristics, ratio, polarity, secondary resistance, burden, ratio error, and phase angle error.
• High Precision: Delivers ratio measurement accuracy of ±0.05% for CT and ±0.2% for PT, with phase angle accuracy of ±2min, suitable for 0.2S class current transformer testing.
• Automatic Parameter Calculation: Automatically generates inflection point voltage/current, 10%/5% error curves, ALF, FS, Ts, Kr, and saturation/unsaturation inductance.
• User-Friendly Operation: One-click testing for CT DC resistance, excitation, ratio, and polarity; unified wiring for most CT tests (except burden test).
• Data Management: Stores 2000 test groups (data retention after power loss), supports U 盘 data transfer to PC, and generates WORD reports via software.
• Portability: Lightweight design (<9kg) with a 5.7-inch transflective LCD for clear visibility in sunlight.

• Test Purpose: Protective class CT, protective class PT
• Output: 0~180Vrms, 12Arms (36A peak)
• CT Ratio Range: 1~30000, Accuracy: ±0.05%
• PT Ratio Range: 1~10000, Accuracy: ±0.2%
• Phase Measurement: Accuracy ±2min, Resolution 0.5min
• Secondary Winding Resistance: Range 0~300Ω, Accuracy 0.2%±2mΩ
• AC Burden: Range 0~1000VA, Accuracy 0.2%±0.02VA
• Input Power: AC220V±10%, 50Hz
• Operating Environment: Temperature -10°C~50°C, Humidity ≤90%
• Dimensions: 340mm × 180mm × 330mm, Weight <9kg
• Compliance: GB20840.1 (IEC60044-1), GB20840.2 (IEC60044-6), GB20840.3