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HF-TC-623 Transformer Core Ground Current Tester
This portable clamp-on Transformer Core Ground Current Tester accurately measures iron core earthing leakage current under live operation. With strong anti-interference performance and waveform display function, it quickly diagnoses multi-point grounding faults to avoid transformer overheating damage and ensure stable grid operation for substations.
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Developed for measuring transformer iron core grounding current, this tester features outstanding anti-interference capability. Controlled by an ARM processor, it automatically completes self-check, data calculation and display procedures.
According to China power industry standard DL/T 596 Preventive Test Code for Electric Power Equipment, the normal operating core grounding current of transformers shall not exceed 0.1A. A transformer iron core is designed for single-point grounding only. If two or more grounding points emerge, a closed current loop will form between the core and the earth. The resultant large current up to tens of amperes will lead to local overheating or permanent burnout of the iron core. Timely detection of potential faults is critical to safe operation and routine maintenance of transformers.
Equipped with dual-layer magnetic shielding CT technology and zero-input impedance current measurement technology, the instrument is barely affected by external electric and magnetic fields, delivering high precision, stability and reliability. It is widely used in substations and power plants to test leakage current on iron cores and clamping parts of transformers, reactors and other high-voltage electrical equipment.
Main Features
- Specialized for transformer core grounding current measurement in power plants and substations
- Adopts 32-bit high-speed DSP chip for fast response, accurate readings and over-range prompt
- ARM control system with graphical Chinese interface for intuitive operation
- Powerful anti-interference performance guarantees authentic and stable test data
- Supports letter, number and Chinese character input
- Built-in large-capacity lithium battery, offering over 10 hours continuous field operation
- Fully automatic measurement with real-time waveform display, simple test workflow
- User-friendly menu, clear readable display visible under direct sunlight
- Built-in calendar function; stores up to 999 groups of data, data will not be lost after power-off
Power Supply Mode
AC & DC dual-power supply design:
- Without AC adapter: powered by built-in lithium battery
- With AC adapter plugged in: automatically switches to mains power supply and charges the battery simultaneously
Technical Specifications
| Parameter | Detailed Specification |
|---|---|
| Power Supply | AC: AC 220V±10%, 50Hz±1Hz (power adapter) DC: Built-in 8.4V / 2.6AH lithium battery |
| Current Input Impedance | 0 Ω |
| AC Current Measuring Range | 0 ~ 10 A |
| Applicable Frequency Range | 45 ~ 65 Hz (for 50Hz power frequency measurement) |
| Measurement Accuracy | ±1% reading ±3 digits @ magnetic field ≤ 5GS ±1% reading ±3 digits @ magnetic field ≤ 10GS ±1% reading ±3 digits @ magnetic field ≤ 15GS ±2% reading ±3 digits @ magnetic field ≤ 20GS |
| Minimum Resolution | 0.01 mA |
| Sampling Rate | 1 time per second |
| Effective Current Display Range | 0.5 mA ~ 10 A |
| Internal Data Storage Capacity | Max. 999 records |
| Screen | Positive LCD display, readable under sunlight |
| Operating Ambient Temperature | -10 ℃ ~ +50 ℃ |
| Operating Humidity | ≤ 80% RH, non-condensing |
| Storage Conditions | -20 ℃ ~ +60 ℃, ≤ 95% RH, non-condensing |
| Overall Dimensions | L365mm × W295mm × H170mm |
| Net Weight | 2.0 kg (including built-in battery) |
Packing List：Transformer Core Ground Current Tester
| Serial No. | Item Description | Quantity | Unit | Notes |
|---|---|---|---|---|
| 1 | Main Unit of Transformer Core Ground Current Tester | 1 | Set | Complete host machine with built-in lithium battery |
| 2 | AC Power Adapter & Charging Cable | 1 | Set | AC220V charging power supply |
| 3 | User Operation Manual (English Version) | 1 | Copy | Detailed operation, parameter introduction & troubleshooting |
| 4 | Factory Calibration Certificate & Inspection Report | 1 | Copy | Official test certification for export |
| 5 | Portable Shockproof Carrying Case | 1 | Piece | Dustproof, anti-collision for outdoor transportation & storage |
| 6 | Quick Operation Guide | 1 | Copy | Concise handbook for on-site technicians |
FAQ for Transformer Core Ground Current Tester
Q1: What is the main purpose of this core ground current tester?
A: It measures the earthing leakage current of transformer iron cores. It can timely detect multi-point grounding faults of the iron core, avoid core overheating and burnout caused by circulating current, and ensure the safe operation of transformers and reactors in substations and power plants.
Q2: Why do we need to test transformer core grounding current regularly?
A: According to international power test standards, the normal core grounding current shall be less than 0.1A. If two or more grounding points appear, large circulating current will be generated inside the core, leading to insulation damage and equipment failure. Periodic testing eliminates hidden dangers in advance.
Q3: How does the instrument realize strong anti-interference ability in harsh electromagnetic environments?
A: It adopts CT double-layer magnetic shielding technology and zero input impedance measurement technology. It can resist the interference of external electric fields and magnetic fields, and maintain accurate measuring results even under strong magnetic field conditions in substations.
Q4: What power supply modes does this device support?
A: Dual AC/DC power supply. Built-in 8.4V lithium battery supports more than 10 hours of continuous field work. When the AC adapter is connected, it will automatically switch to mains power and charge the battery at the same time.
Q5: What is the measuring range and minimum resolution of current?
A: AC current range: 0~10A; minimum resolution: 0.01mA, which can capture tiny leakage current changes accurately. Applicable frequency covers 45~65Hz for 50Hz power frequency testing.
Q6: Can the tester store test data and view historical records?
A: Yes. It can store up to 999 groups of test data, and the stored data will not be lost after power off. It is also equipped with a perpetual calendar for convenient record sorting and archiving.
Q7: Does the screen work well under outdoor sunlight?
A: Adopting positive display LCD screen, the content is clear and legible under direct sunlight, perfectly adapting to outdoor on-site maintenance scenarios.
Q8: What are the advantages of the internal chip configuration?
A: Equipped with 32-bit high-speed DSP and ARM processor. It realizes automatic measurement, fast sampling, waveform real-time display and over-range prompt, with simple operation and high reading accuracy.
Q9: What ambient temperature and humidity can the instrument adapt to?
A: Operating temperature: -10℃ ~ 50℃, humidity ≤80%RH without condensation; storage temperature: -20℃ ~ 60℃. It can adapt to most outdoor and indoor power working environments.
Q10: Is the machine lightweight and easy to carry for field inspection?
A: The net weight is only 2.0kg, compact overall size. It is portable and comes with a shockproof carrying case, very suitable for mobile testing among multiple transformer rooms.
Q11: How about the measurement accuracy under different magnetic field interference?
A: Within 0~15GS magnetic field interference: accuracy ±(1% reading + 3 digits); within 20GS magnetic field: accuracy ±(2% reading + 3 digits), meeting industrial high-precision testing requirements.
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