First, the same size of the crane, folding arm and telescopic which is better? The same tonnage, crane of the same brand, from the economic basis, telescopic than the folding arm is cheaper, from the operation point of view, telescopic than the folding arm should be simple! Second, B can open ten tons of car crane? Yes, ten tons of truck cranes belong to the yellow card, B can open, but in some places to operate permits, no operation permits do not allow work. Third, with the car crane what brand? The truck cranes mainly include XCMG, Shimei, Feitao, and Furukawa from the brand. They mainly include Dongfeng, Jiefang, Jianghuai, Futian and Jiangling. Fourth, how to calculate with the car rental? Rent-a-car rental is generally rented out according to time, and the rental price varies according to tonnage. Such as: about 10 tons is generally 500-800 per hour, (less than one hour is also charged by one hour). Fifth, the world's largest truck crane can lift multiple? Trinity developed 3,000 tons at the beginning of this year. However, as soon as the experimental boom was broken, it did not dare to disclose it. The largest tonnage crane in the world is now 3,200 tons. It was developed by Zoomlion in May of this year. success. The bigger one is not the crane. It is crawler crane.
I. High & Low voltage cabinets installation of power plant
1. 10KV high voltage switch cabinet installation of power plant
2. 0.4KV low voltage switch cabinet installation of power plant
3. Installation of generator protection system, synchronization system, transformer protection, H.V. motor protection, circuit protection in a power plant.
II. Electrical configuration testing items of power plant
1. Vacuum circuit breaker insulation resistance measurement, each phase circuit resistance measurement and AC voltage withstand tests of 10KV H.V. switch cabinet.
2. DC resistance measurement of CT and PT, polarity test, ratio test, AC voltage withstand tests in 10KV H.V. switch cabinet.
3. AC voltage withstand tests for whole 10KV H.V. switch cabinet.
4. AC resonant test for 10KV H.V. electric cable.
5. DC resistance measurement of generator stator and rotor.
6. Generator stator coil insulation resistance measurement and DC voltage withstand tests.
7. Generator rotor insulation resistance measurement.
8. Generator rotor AC impedance and power loss tests.
9. No-load characteristic test of generator
10. Generator checking phase sequence (fist checking phase and second checking phase separately).
11. Generator short circuit characteristic test.
12. Measurement of residual voltage of stator after automatic magnetic blow-out and switch opening of generator.
13. Generator shaft voltage measurement.
14. Generator simulate synchronization.
15. All of the second circuit checking, measuring, switch tripping & closing tests, protection fixed value setting, protecting the STG trip test and magnetic blow-out tripping test for Steam Turbine and generator.
III.Electrical problem troubleshooting in power plant
Problem Description: a coal mine`s 35KV H.T. switchgear OC protection tripped suddenly in He`nan Province, it caused sudden power lost of mine fan and endanger miner safety.
Auto-reclosing via switchgears` automatic reclosing function, through analysis, the reason is a set of 3000KW generator failure. Specific reason is: When the turbo-generator was running normally, exciting voltage lost suddenly, leading phase operation happened, the generator absorbed reactive power and lead to becoming motor running. Generator protection and power plant connecting line protection did not launch. After the generator absorbed a certain value of reactive power, the 35KV H.T. switchgear`s OC protection tripped.
Investigation: generator and power plant connecting line protection setting fixed value exceed the protection fixed value of 35KV switchgear side, it lead to nearby protection did not launch and override trip when generator failure.
Electrical Cabinet Care,10Kv Electrical Cabinet Care,0.4Kv Electrical Cabinet Care,Electric Governing Reconstructing Shandong Qingneng Power Co., Ltd. , https://www.steamturbine.be
September 26, 2019