Transformer core grounding current testerapplication
Power transformer is the most important electrical equipment in the power system. Once a fault occurs during operation, it will cause serious consequences to the power system. The iron core of a normally operating transformer is grounded at a single point. If two or more points are grounded simultaneously, a current loop will be formed between the iron core and the ground. The maximum current can reach several tens of amperes, which will cause local overheating or even burning of the iron core. Being able to detect latent faults in the transformer as soon as possible is the main tool to ensure safe operation and normal maintenance of the transformer. Mainly suitable for leakage current testing of iron cores and clamps of electrical equipment such as transformers and reactors in substations and power plants. It can also be used for current and leakage current testing of lines or equipment in fields such as power, communication, meteorology, railways, oil fields, construction, metrology, scientific research and teaching units, and industrial and mining enterprises.
Transformer core grounding current testerapplication
The host adopts a high-speed microprocessor and utilizes FFT transformation, digital filtering and other technologies to display the magnitude, frequency and amplified waveform of the measured current in real time, making the test data more accurate; Equipped with date and time setting function; Equipped with alarm threshold setting and alarm indication function; It has the function of setting the test point number; Equipped with automatic shutdown or non automatic shutdown settings; It can store 100 sets of data and waveforms.
| Function | Transformer core grounding current test; Online testing of AC leakage current, current, and frequency |
| Power supply | DC6V alkaline dry battery LR6 1.5V × 4 |
| test method | Clamp CT |
| Jaw size | 80mm x 80mm (can clamp a 80mm wire or a 96mm x 4mm flat steel ground wire) |
| Range | AC 0.00mA~30.0A |
| Resolution | AC 0.01mA |
| Accuracy | ± 1.5% ± 3dgt (50Hz/60Hz, 23 ℃± 2 ℃, with the wire at the center of the clamp) |
| Frequency | 20Hz~200Hz |
| display mode | LCD:128dots×64dots |
| Instrument size | Host 170mm × 75mm × 30mm; current clamp 194mm × 145mm × 40mm |
| Quality | Host 240g (including battery); Current clamp 780g |
| LCD size | Display area: 44mm × 27mm |
| Electric field interference | When the external electric field is 100A and close to 10mm, it is about 10mA |
| sampling rate | 3 times per second |
| data storage | 100 sets (no data loss due to power failure or battery replacement) |
| Waveform indication | Yes, it displays the automatically amplified waveform and cannot be used to determine the amplitude based on this waveform |
| Number setting | The tested points can be numbered, such as # 001 |
| Auto Shutdown | The instrument has a 5-minute automatic shutdown and a selection function for long-term operation without shutdown. It defaults to automatic shutdown mode when turned on. |
| Alarm Settings | Alarm threshold setting range: 10mA~30.0A |
| alarm indication | When the test value exceeds the alarm threshold, the test data flashes and displays |
| Line voltage | AC 600V and below line testing |
| Overflow display | Overscale overflow function: "OL" symbol display |
| battery voltage | When the battery voltage drops to 4.8V ± 0.1V, the low battery voltage symbol is displayed, reminding to replace the battery. At this time, the measured data is also accurate. |
| rated current | 5mA in power-saving mode, maximum 20mA |
| lead length | The lead length of the current clamp is 2 meters (can be customized and extended) |
| Working temperature and humidity | -10℃~40℃; Below 80% RH |
| Storage temperature and humidity | -10℃~60℃; Below 70% RH |
| Insulation strength | AC 2kV/rms (between screw and housing) |
| Suitable for safety regulations | IEC1010-1、IEC1010-2-032、 Pollution level 2, CAT III 600V, IEC61326 (EMC standard) |
