35kV transformer substation restricts harmonic measure

Workshop of 35 KV of industry of paper of Xinjiang Tian Hong changes ark of switch of high pressure of electric place 35 KV 7, by the transformer composition of 6 35/0.4 KV, the capacity is 6 × 1600 KVA, 35 KV takes a line 35 KV of 110 KV transformer substation gives You Tianfu city on the west line power supply. 2001, because of systematic harmonic inbreak, cause transformer of 35 KV voltage TV ark burn down, because 35 KV is oily breaker, cause burn down of ark of switch of high pressure of face of whole 35 KV 7, explosion, make workshop power supply is stopped, bring serious effect to production.

The generation of 1 harmonic

Harmonic of electrified wire netting comes from at 3 respects: It is power source quality produces harmonic not high, the dynamo is in as a result of three-phase winding it is very difficult to be made accomplish absolutely semmetry, core is accomplished very hard also agree equably absolutely, power source can produce harmonic. The 2 harmonic that are the generation in be defeated by distribution system to move; The 3 harmonic that are generation of the equipment that use phone. Among them the electron harmonic that arises with electric equipment is most.

Be defeated by distribution basically is harmonic of generation of electric power transformer in the system, as a result of the saturation of transformer core, those who magnetize a curve is nonlinear, add economy of the consideration when designing transformer, close choice of its job magnetism is in the close saturation that magnetizes a curve paragraph on, make so magnetization electric current shows fastigium weaveform, contain consequently strange second harmonic. The saturated degree of the configuration of its size and magnetic circuit, core is concerned. The saturated rate of core is higher, linear of deviate of transformer work place is further, harmonic electric current is bigger also, among them 0.5% what 3 times harmonic electric current can amount to rated electric current.

In the equipment that use phone, furnace of device of equipment of commutate of brilliant brake canal, frequency conversion, electric arc, calcium carbide furnace, gas discharge kind lighting source, electric home appliances
The calcium carbide factory of day trade chemical plant is in process of manufacturing calcium carbide, because electric arc furnace, calcium carbide furnace heats when raw material, the three-phase electrode of electric stove is very difficult the charging with rugged at the same time bring into contact with, make combustion not stable, cause three-phase load lopsided, produce harmonic electricity, via the triangular join winding of transformer infuse electrified wire netting. The harmonic that basically is 2 ～ 7 among them, average but 8% ～ of Da Jibo 20% , can amount to most 45% .

The limitative measure of 2 harmonic

35 KV of 110 KV transformer substation gives Tian Fucheng on the west line bout gives Tian Hong power supply of transformer substation of workshop of paper industry 35 KV, the power supply of calcium carbide factory that bout line still gives day trade chemical plant, because day trade chemical plant is producing harmonic of the generation in the process of calcium carbide, and the harmonic that basically is 2 ～ 7, so great harmonic source classics transmission network, flow into transformer substation of day of workshop of 35 KV of grand paper industry. Ark does not have transformer of voltage of transformer substation of workshop of 35 KV of industry of Tian Hong paper device of arc of disappear concordant disappear. When systematic harmonic inbreaks, be sure to cause accident of burn down of transformer substation of workshop of 35 KV of industry of Tian Hong paper. Be aimed at the influence of systematic harmonic, the breaker inside 35 KV ark is chosen to be vacuum breaker when re-act is designed, former voltage transformer ark is changed for humorous of XHG disappear arc, disappear, choose ark of protector of line and overvoltage.
Previous12 Next