Summary: Medium or small the accumulator dc screen that terminal transformer substation uses, safeguard workload big, accumulator life is brief, if use super electric capacity,replace accumulator to will have revolutionary progress.
　　 Keyword: Dc screen is super capacitance

　One, the problem that screen of dc of current transformer substation exists

In transformer substation of terminal of our country 110KV, 35KV, 10KV, and the factory uses 6KV distribution system, used accumulator dc screen and silicon commutate electric capacity extensively store the power source that can sort screen to serve as operation, control and protection continuously. Come a few years, more product puts in the following problem in move:

1, screen of dc of cadmium nickel accumulator:

When dc generatrix outputs 220V, comprise by 180 accumulator commonly. Accumulator accomplishs every batteries impossibly in machining production fill discharge character to agree completely, although produced manufacturer to undertake matching assorted when leave factory, arrived in user hand do not have the leeway that choose. In use, with same charge power source, discharge to same negative charge again, as time passes, because individual batteries is characteristic the difference is bigger and bigger, and the performance that affects whole unit.

Cadmium nickel accumulator is moving in, be in float for a long time to fill position, the stand or fall of charger function, affect the life of batteries directly. Battery life is more than general manufacturer acceptance 10 years, but in be applied actually, often have 3~5 only year. Because,this is, if float fills electric current too big, the water and electricity that can make electrolyte medium solves Cheng Qing and oxygen, these two kinds of gas blend the explosive gas that is danger, if ventilated and undesirable, have data introduction, some nobody are on duty transformer substation, the accident that ever produced straight explosion drifting screen (electric world 2000 12 period) . Origin: Pole of uncut jade of Mian Lai white?

Charge to still can make batteries risks fluid too. Reach in batteries appearance oxide of Chinese ink green produces on splicing repeatedly, corrode component part, reduce insulation, make increase from discharge.

Fill too still can produce oxidation reductive reaction, oxidation cadmium is generated on negative plate, reduce plate valid area, the capacity is reduced, this is the effect of " memory " that common weighs. To hold the size of batteries, need every year to undertake 1~2 to accumulator second " activation " experiments, the standard system that the experiment must provide by manufacturer home undertakes full discharging, what just can assure batteries is businesslike. As use the person that safeguard for, it is a headachy thing. Because cadmium nickel batteries has harder discharge character curve, discharge quantity is achieved 80% when, voltage drops not apparent also. Have neglect a bit, can cause batteries to pass discharge, occurrence polarity inverts and discard as useless. Because dc screen is transformer substation equipment,medium Chongzhongzhi is weighed, the safety that affects transformer substation directly moves. In " safety the environment of " of working overweight Mount Taishan falls, a lot of units include dc screen need check project undertakes assessing daily. Daily be opposite 180 (220V) batteries undertakes fluid infusion, measure every to carry voltage only, make a record, it is really already as dry as a chip, the thing of irritated lock. Like batteries full installation is inside ark, still have particular risk. 　　　　　　　　　　　　　　　　
Previous12 Next

Previous:MK - direct current source of 50 series intelligence maintenance-free
Next：Overhaul and safeguard of UPS UPS normally