Safety measures of the three-channel DC resistance test instrument
The performance characteristics of the three -channel DC resistance tester:
High -efficiency three -channel test: The instrument supports the three -channel synchronous measurement function, which can achieve rapid measurement of three -phase dwarf resistance under the star -type winding winding, and automatically calculate the three -phase imbalance rate, which greatly improves efficiency. For transformers of different methods, you can also use phase -by -test mode for easy testing to completion.
Tyromonas of excitement method: For large transformers with triangular connection between the five -pillar iron heart and the low -voltage winding, the instrument supports high and low pressure string excitement method. The internal automatic magnetic circuit ensures the rapid and precise test of the low -voltage winding resistance.
Winding material adjustment: Copper or aluminum can be selected according to the measured winding material, which is convenient for adjusting the temperature conversion coefficient according to the material to ensure the accuracy of the measurement results.
Neutral point detection: Special design of the neutral point leads to the wire resistance detection function, making the three -channel test data closer to the single -phase test value, and further improve the measurement accuracy.
Safety protection function: It has a complete protection circuit and discharge alarm function. Clear discharge indicators can effectively reduce the risk of misunderstanding.
HD touch screen display: Use a 7 -inch color touch screen, the interface is beautiful, and the test data is updated in real time, which is convenient for users to view intuitively.
Various interface support: Configure RS232 and USB interfaces to meet data transmission requirements.
Data storage and management: Internal clocks of the instrument support the storage, inspection and printing function of test data, can save up to 100 groups of test records.
Flexible parameter settings: Support custom settings, including winding type, sub -contact, test phase, temperature and other parameters to ensure the adaptability and flexibility of the instrument.
Precautions for the three -channel DC resistance tester:
The three -channel DC resistance tester is a widely used power testing tool that can effectively measure the DC resistance of electrical equipment such as transformers. However, the safety operation of the device plays a vital role in the accuracy of the result and the life of the equipment. Here are key safety measures in the use of instruments.
1.Basic requirements
Before using the three -channel DC resistance tester, you must read the operating manual carefully to clarify the operating guide and safety specifications. The operator should also have basic electrical equipment operation knowledge to ensure correctly and safely using the equipment.
2. Use the environment
This instrument is suitable for a variety of places, but the following environment should be avoided:
Rainy places: humidity may cause short circuit or affect equipment performance.
Corrosive gas area: Corrosive gases may damage the internal components of the instrument.
High temperature environment: High temperature may lead to overheating instruments and affect measurement accuracy.
Direct sunlight: Direct sunlight will cause the equipment to overheat, and it will also affect the clarity of the display.
3. Operation precautions
Physical protection: Avoid severe vibrations in use to prevent test accuracy or damage to internal components.
During the discharge instructions of gear switching: Before the load -free regulator transformer is replaced, it must be reset. After the discharge is over and waited for the alarm to stop, the distribution can be switched. Especially when switching points, be sure to ensure that the discharge is over and the alarm stops to prevent the device from being damaged due to unfinished discharge.
Disassembling operation: Before disassembling the test line, be sure to confirm that the discharge is over, and the alarm stops before the stringing operation can be performed. At this time, if the fire discharge occurs, it is a normal phenomenon, which may be caused by the remaining current on the three short wiring in the magnetic aid method.
Three-channel data stability: When using the three -channel test, note that the test time may be longer due to the initial establishment of magnetic circuit. After switching the points, the stable time will be shortened accordingly.
4. Maintenance management
Daily maintenance, maintenance and adjustment should be performed by professionals. Unsecured persons may cause damage to the equipment due to errors, which will affect security. Periodic maintenance and maintenance of equipment is a necessary measure to ensure its normal operation.
5. Improve test efficiency
The three -channel design has greatly improved the test efficiency. The test time is 1/3 of the traditional method. It is suitable for the DC resistance of the transformer to the various segments of the transformer. Through the three -channel testing at the same time, the test time not only reduces the test time, but also improves the convenience of on -site work. However, the above safety measures should be strictly abide by the above operations to ensure that the test process is proceed smoothly.
Technical indicator of the three-channel DC resistance tester:
1. Three-phase test
Current output | Measurement range |
50A (25A+25A) | 0.4mΩ～0.1Ω |
20A (10A+10A) | 1mΩ～0.6Ω |
10A (5A+5A) | 2mΩ～1.2Ω |
2A (1A+1A) | 10mΩ～6Ω |
400mA (200mA+200mA) | 100mΩ～30Ω |
40mA (20mA+20mA) | 10Ω～200Ω |
2. Single-phase test
Current output | Measurement range |
50A | 0.2mΩ～0.2Ω |
20A | 0.5mΩ～1Ω |
10A | 1mΩ～2Ω |
5A | 2mΩ～4Ω |
1A | 10mΩ～20Ω |
200mA | 100mΩ～100Ω |
20mA | 10Ω～20KΩ |
3. Resolution: 0.1μΩ
4. Accuracy: ±(0.2%rdg+2dgt)
5. Operating temperature: -10℃ ~ 40℃
6. Ambient humidity: ≤80%RH，no condensation
7. Power supply: AC220V±10%, 50Hz±1Hz
