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Outdoor switchgear applications in the Rural - outdoor switchgear, technology - HC net electrical i by fsfshjk qwrfghjk





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Outdoor switchgear applications in the Rural - outdoor switchgear, technology - HC net electrical i by
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Outdoor switchgear applications in the Rural - outdoor switchgear, technology - HC net electrical i


 
Business,Business News,Business Opportunities
A current operation of rural power network equipment, the main problems   (1) 10kV Outdoor Many kinds of switchgear, model complex, individual products of poor quality, users choose products that are blind, lack of rational and scientific.

(2) unattended substation, substation qualify for the suspended service, transforming operation a long time. (3) Rural Reconstruction, the rural power network to improve the quality line, but lines still long time troubleshooting.

(4) Rural distribution lines run in the drop fuse Trip frequent. 2 10kV outdoor switchgear options (1) 10kV outdoor circuit breaker selection Often referred to 10Kv outdoor oil circuit breaker with column switching, column sulfur hexafluoride switch, pole vacuum switch. Mainly used in urban and rural power grid 10Kv line contact line, the main rods and wires, branch line and substation opening and closing the outlet and inlet and outlet 10Kv so on. The role of circuit breakers to switching power supply equipment and protection, short circuit current of the Closing. There are still widely used is also an outdoor drop fuse circuit breaker, the essence of the circuit breaker and disconnect switch combination, which combines the functions of the two, but the smaller capacity, performance is not perfect.

Falling Fuse: Rated current often 100 ~ 200A, the rated short-circuit breaking current 6.3KA, mechanical life rated breaking current of more than 2000 times, can often operate. The product is simple and reliability, low cost, will continue to use, there is still a very Johnson Vitality. Some products appear in the current run of poor quality, mainly the existence of individual manufacturers industry Monopoly , Improper Competition Behavior. Users purchasing products to pay attention to product quality.

Oil Circuit Breakers (Oil column switch): This product is an early product, poor breaking capacity circuit breaker. Now, with the expansion of network capacity, most of the oil circuit breaker insufficient capacity, flammable oil circuit breakers, leakage, easy to lead to the second accident, in order to eliminate the object.

SF6 circuit breaker: rated current constant for the 400A, 630A. Be breaking off short-circuit current 12.5kA, 16kA. Mechanical life of more than 2000 times rated current action, rated short-circuit breaking current breaking times 30-50 times. Oil-free, small size, can often operate. However, processing and material requirements, easy to leak, to open up the rear resultant toxic, polluting the environment.

Vacuum Circuit Breaker: Rated current often 400A, 630A. Rated short circuit breaking current has 12.5kA, 16kA, 20kA. Agency life breaking rated current more than 10,000 times the rated short-circuit current breaking times 20-100 times, suitable for frequent operation. The main problem is running the vacuum interrupter surface flashover, when the voltage of division. The product is oil-free, pollution-free, machinery, long life, daily-dimensional Care Workers For a small amount of easy to implement remote control and Automation , Should be priority in the selection.

(2) 10kV outdoor load switch option. 10kV outdoor load switch is mainly used for agricultural network distribution line sections and fault isolation, division and with the rated current carrying capacity, but not breaking short-circuit current, a common gas and vacuum load switch, SF6 load switch two form.

gas load switch: the use of solid gas material composition of the slit in the arc formed under the action of blowing a lot of gas arc, breaking times rated current is about 20 times, operation and maintenance of heavy workload, according to the the use of power distribution lines, county bureau, the failure rate higher load switch.

vacuum, SF6 load switch. The product parameters of SF6 and vacuum circuit breakers similar difference is not qualified to protect the load switch CT Not short-circuit breaking current, but can withstand short-circuit current provisions, when closing load current, long life, easy maintenance support point. Often rated current 630A, rated short circuit making current 40KA, 50KA. Mechanical life rated current breaking more than 10,000 times for frequent operation, should be preferred in the selection of use.

(3) 10kV outdoor disconnector choice. 10kV outdoor circuit isolation switch is mainly used for isolation, power TRIPPING state obvious fracture, easy to change operation mode when the line maintenance can reliably carry the work of current and short circuit current, but not a breaking load current. Products There are three very linkage operation, pole operation in two forms.

3 local conditions, a reasonable allocation outdoor switchgear (1) qualify an unmanned substation switching device configuration # bar. Unattended substation outlet suspended service operations for a long time operation of their classes because of personnel costs in the journey of the time, followed by transforming the five defense installations in the five defense computer operation is relatively slow, so the remote substation outlet suspended service longer operation time. In order to solve the conflict stop line maintenance, the grid method of Lanxi Board: 1 # rod outlet at the substation to install a set of FZW20-12/630-16, 10kV outdoor vacuum load switch, when the 10kV qualifying inspection or repair, Monitor Classes according to the scheduling order, remote substation circuit breaker opened (hot standby), the line maintenance staff opened the corresponding outlet 1 # rod load switch, you can enter the repair work. However, there are units method, substation outlet 1 # bar install a 10kV disconnecting switch, I think it is inappropriate misuse prevention requirements under the transformer, "pulled knife before is in the disconnect switch to verify the location of the corresponding "wit a # bar pull knife can not confirm when the substation circuit breaker status, so prone to error closes knife, therefore, qualify a # rod load switch configuration is more suitable.

(2) backbone switching equipment configuration. Rural distribution lines with substation switchgear configurations related to the design of substation according to the original electric power department Agricultural Power Division's "small-capacity, dense spots, short radius" of the construction principle, qualify for 10kV substation electrical radius of not more than 15km, power load 2000kVA about suitable. Trunk lines, contact switches, disconnect switches configured to switch the light of actual needs and options pricing models of switchgear. Contact switch the power switch on the operation of sub-single-and double-rings in two kinds of power. That a single power switch on operation of first contact switch into the load side of the power line switch opened, and then bonding the two lines of contact between the switches, transmission after contact switch pulled into the load side of the power line switch, users do not need power failure However, when installing contact switch

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