In the insulation test, the insulation resistance value at a certain moment cannot fully reflect the good or bad of the insulation performance of the test product. This is due to the following two reasons. On the one hand, the insulating material with the same performance has small insulation resistance when the volume is large. , The volume of the insulation resistance is small. On the other hand, the insulating material has a charge-absorption ratio process and a polarization process after applying a high voltage. Therefore, the power system requires that the absorption ratio—the ratio of R60s and R15s and the polarization index—R10min and R1min ratios should be measured in the insulation test of the main transformer, cable, motor, etc., and use this data to determine the insulation status. The pros and cons.
3. Why does the instrument need to be connected to the G terminal in a high-voltage, high-resistance test environment?
When the rated voltage is high at both ends of the test object, and the insulation resistance is high, the surface of the tested product is exposed to moisture, and the leakage caused by the pollution is large. The indication error is large, and the G terminal of the instrument is to be tested. The current leakage from the surface of the product is bypassed so that the leakage current does not pass through the test circuit of the meter and the error caused by the leakage current is eliminated.
4. When measuring the DC output voltage of the rated output of L and E of some types of insulation instruments, the voltage across L and E is measured with the analog multimeter DCV. Why does the voltage drop a lot, and the digital multimeter will not?
Measure the rated DC voltage directly at both ends of the insulation resistance tester L, E with an ordinary analog multimeter, and the measurement result is much smaller than the nominal rated voltage (out of the error range), and the digital multimeter will not . This is because the pointer multimeter has a smaller internal resistance, while the digital multimeter has a relatively large internal resistance. The pointer multimeter has a smaller internal resistance, and the output voltage of the insulation resistance tester LE decreases much, and is not the output voltage during normal operation. However, using a multimeter to directly measure the output voltage of the insulation resistance tester is wrong. It should be measured with a static high voltage meter with a large internal resistance or with a load voltage divider with a sufficiently large load resistance.

3.0 Ton Spider Crane

3.0 Ton Spider Crane

specifications 2.98t Maximum working radius 8.8m×0.25t Maximum elevation on the ground 9.2mX 1t Maximum underground elevation 10mX1t (4 rope) 20mX1t (2 rope) 40mX0.74t (1 rope) Roll up device Lift hook up speed 0-8m / min (4 rope) Steel wire rope specifications Φ10mm×50m retractor device Hanging arm form 5-section boom, pentagonal structure Hanging arm length / time 3.1m-9.2m/20sec Up and down device Arm angle / time 0-78


Hubei Ruiyate Automobile co.,ltd., located in the famous ancient "bells" music of the township, the capital of special vehicles -- draws in hubei province. Suizhou is located in the north of hubei province, the Yangtze river and the huaihe river interchange, east ChengWuHan, xiangyang, xinyang in the north west, south of jingzhou, the throat "" surf, the conjugate JingYu han. Suizhou is "north ordos town", "north gate" opening to the outside world, hubei province, is the national implementation of the western development strategy important relay station and transfer station from east to west.

This company mainly produces and sales overhead working truck series, the series of modern municipal engineering, pavement maintenance work series, the series of RV. The products sell well both at home and abroad, and the market prospect is very broad, at the same time cater to the development trend of special vehicles in our country.

3.0 Ton Spider Crane,Spider Crane Truck,3Ton Spider Crane Truck,5 Section Spider Crane Truck

Hubei ruiyate Automobile Co.,Ltd , https://www.nbruiyate-automobile.com

February 19, 2024