I. Overview
This instrument is used for automatic testing of protective and metering CT/PT characteristics, suitable for both laboratory and field testing.
• Supports testing of CT and PT
• Meets requirements of GB1207, GB1208 and other standards.
• No external equipment needed; standalone unit completes all tests; excitation, ratio, and polarity tests are performed simultaneously in one test.
• Built-in micro fast printer for on-site printing of test results.
• Easy operation with intelligent prompts, making it user-friendly.
• Large LCD screen with graphical display interface.
• Automatically provides CT/PT (excitation) knee point values per standards.
• Automatically provides 5% and 10% error curves.
• Stores up to 3000 test records; data retained after power-off.
• Supports USB drive for data transfer; readable via standard PC and generates WORD reports.
• Compact and lightweight ≤28Kg, very convenient for field testing.
II、Main Test Functions
CT (Protective, Metering) | PT |
• Volt-ampere characteristic (excitation) curve | • Volt-ampere characteristic (excitation) curve |
• Automatic knee point value | • Automatic knee point value |
• Automatic 5% and 10% error curves, can measure actual limit value factor (ALF) | • Ratio measurement |
• Ratio measurement, polarity check | • Polarity check |
• Ratio error measurement | • Ratio error measurement |
• Phase (angle error) measurement | • Phase (angle error) measurement |
• Primary current injection test | • AC withstand voltage test |
• AC withstand voltage test | • Secondary burden test |
• Secondary burden test | • Secondary winding resistance test |
• Secondary winding resistance test | • PT volt-ampere voltage multiplier adjustable (1.2—3.5) |
• Can test medium and low voltage transformers, zero-sequence transformer volt-ampere characteristics | |
• Can test GIS, bushing CT | |
• Comprehensive test: excitation, ratio, and polarity in one test |
III、Main Technical Parameters
Item | Parameter | |
Power Supply | AC220V±10% , 50Hz | |
Equipment Output | 0～1200V 5KVA *max setting 20A | |
High Current Output | 0～600A | |
Excitation Accuracy | ≤0.5% (0.2%*reading + 0.3%*range) | |
Secondary Winding Resistance Measurement | Range | 0.1～300Ω |
Accuracy | ≤1.0% (0.4%*reading + 0.6%*range) | |
Secondary Actual Burden Measurement | Range | 5～500VA |
Accuracy | ≤0.5% (0.2%*reading + 0.3%*range) ±0.1VA | |
Phase Measurement (Angle Error) | Accuracy | 4min |
Resolution | 0.1min | |
CT Ratio Measurement | Range | ≤50000A/5 (10000A/1A) |
Accuracy | ≤0.5% (0.2%*reading + 0.3%*range) | |
PT Ratio Measurement | Range | ≤500KV |
Accuracy | ≤0.5% (0.2%*reading + 0.3%*range) | |
