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HF-IT-202 Variable Frequency Instrument Transformer Tester
The Variable Frequency Instrument Transformer Tester adopts variable frequency testing technology to comprehensively detect excitation, winding and error characteristics of CT and VT. It delivers high precision measurement, greatly adapting to on-site power inspection and laboratory calibration requirements.
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Users only need to finish simple parameter setting for transformers; the tester automatically records full-process test data, calculates and displays transformation ratio & volt-ampere characteristic curves automatically. It eliminates tedious manual work including wiring replacement, manual voltage regulation, manual data recording, sorting and curve plotting.
On-site calibration of current transformers requires no standard current transformers, current boosters, load boxes, voltage control cabinets or heavy high-current cables. Simple wiring and operations enable CT calibration, which greatly reduces labor intensity and improves working efficiency. It is ideal for on-site transformer calibration with advantages of fast speed, simplicity, high accuracy and convenience.
Features & Main Functions
- It fulfills all test requirements for various CTs (protection, metering, TP class): excitation (volt-ampere) characteristics, transformation ratio, polarity, secondary winding resistance, secondary burden, ratio error & phase error. It also tests excitation features, transformation ratio, polarity and secondary winding resistance for all types of electromagnetic PTs.
- Automatically captures knee-point voltage/current, 10% & 5% error curves, ALF, FS, secondary time constant Ts, remanence coefficient Kr, saturated & unsaturated inductance and other CT characteristic parameters.
- Complies with international & national standards including GB1208 (IEC60044-1), GB16847 (IEC60044-6) and GB1207; it automatically selects applicable test modes according to transformer type and class.
- Adopts advanced low-frequency test principle, supporting CT tests up to 400kV high-voltage grade.
- Extremely easy operation: one-key completion of CT winding resistance, excitation, ratio and polarity tests. Except burden measurement, all items adopt identical wiring scheme.
- User-friendly full Chinese graphical interface with built-in panel printer to print curves and test data on demand.
- Large-capacity memory stores over 2000 groups of test data with permanent data retention.
- Test data can be exported to USB flash drive for post-processing analysis on computers and automatic WORD report generation.
- Built-in knee-point automatic calculation, data screening & printing, date and time display functions.
- Integrated compact design, net weight only 8.2kg, lightweight and portable for mobile field tests.
Technical Specifications
| Test Item | Parameter Details |
|---|---|
| Input Power Supply | Voltage: AC 220V±10% Frequency: 50/60Hz |
| Output | Voltage: 0~180Vrms Current: Max 12Arms, 36A (peak value) |
| CT Ratio Measurement | Range: 1 ~ 40000 Accuracy: ±0.2% |
| PT Ratio Measurement | Range: 1 ~ 40000 Accuracy: ±0.5% |
| Phase Measurement | Accuracy: ±3min Resolution: 0.3min |
| Secondary Winding Resistance Measurement | Range: 0~300Ω Resolution: 1mΩ Accuracy: 3%±1mΩ |
| AC Burden Measurement | Range: 0~300VA Resolution: 0.01VA Accuracy: 0.2%±0.1VA |
| Ambient Conditions | Operating Temperature: -10℃ ~ +50℃ Storage Temperature: -10℃ ~ +50℃ Relative Humidity: 5% ~ 95%, non-condensing |
| Overall Dimensions | 340mm×296mm×174mm |
| Net Weight | Less than 9kg |
Packing List
| Serial No. | Item Description | Qty | Unit | Notes |
|---|---|---|---|---|
| 1 | Variable Frequency Instrument Transformer Tester Main Unit | 1 | Set | Integrated host with built-in printer |
| 2 | High Voltage Test Connecting Cables | 1 Set | Set | Complete wiring leads for CT & PT testing |
| 3 | AC Power Cord (220V) | 1 | Piece | For equipment power supply |
| 4 | User Operation Manual | 1 | Copy | English & Chinese bilingual version |
| 5 | Factory Calibration Test Certificate | 1 | Copy | Official metering certification document |
| 6 | Thermal Printing Paper Rolls | 2 | Rolls | Spare paper for onboard printer |
| 7 | USB Flash Drive | 1 | Piece | For exporting test data & reports |
| 8 | Shockproof Portable Carrying Case | 1 | Piece | Anti-collision shell for field transportation |
| 9 | Spare Fuses | 2 | Pieces | Consumable spare parts |
FAQ | Variable Frequency Instrument Transformer Tester
Q1: What is the main application of this variable frequency instrument transformer tester?
A: It comprehensively tests excitation characteristics, transformation ratio, polarity, winding resistance and burden of current transformers and voltage transformers, widely used for on-site calibration and laboratory inspection in power systems.
Q2: Does this tester need auxiliary equipment like standard CT or current booster during field testing?
A: No extra auxiliary devices are required. It adopts advanced low-frequency testing principle with simple wiring, which greatly reduces on-site preparation work and labor intensity.
Q3: Which national & international standards does the instrument comply with?
A: It conforms to GB1208, GB16847, GB1207, IEC60044-1, IEC60044-6 and other mainstream CT/PT testing standards worldwide.
Q4: What key characteristic parameters can it automatically calculate and measure for CT?
A: It can test knee-point voltage/current, 5%/10% error curves, ALF, FS, secondary time constant Ts, remanence coefficient Kr, saturated inductance and other core parameters automatically.
Q5: Is the operation complicated? Can most test items use the same wiring mode?
A: Operation is one-click automatic measurement. Except secondary burden test, all other test items share identical wiring, avoiding repeated wiring troubles.
Q6: Can test data be printed and exported for report generation?
A: Equipped with an onboard thermal printer for on-site curve & data printing. Test records can be saved to USB flash drive to generate editable Word reports on computers.
Q7: What is the storage capacity for test data?
A: Built-in large-capacity memory supports storing more than 2000 groups of test data, and data will not be lost after power off.
Q8: What voltage level transformers can this device support to test?
A: Based on low-frequency testing technology, it is applicable for testing instrument transformers up to 400kV high voltage grade.
Q9: What are the measuring ranges and accuracy for CT & PT transformation ratio?
A: CT ratio range: 1~40000, accuracy ±0.2%; PT ratio range: 1~40000, accuracy ±0.5%.
Q10: Is the machine portable for outdoor mobile testing?
A: The integrated machine weighs less than 9kg with compact dimensions. It is lightweight and convenient for frequent field mobile calibration tasks.
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