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It is required is to install generators to feed loads of 2807 kW + j 1621 kVAR = 3241 kVA on 6.6kV, we propose to use 0.4 kV generators and use step-up transformers to feed the loads with 6.6 kV, my question is what is the best combination of generators for this load, is it better to use: 1- One...

We have commissioned and tested a power transformer 63MVA, 132/33kV, but because of the delay of executing the 132kV source cable we didn't energize the transformer, it's now about one year since our testing, what tests can be done before energize the transformer? Keeping in mind we have done...

Hello, I have a question if there is IEC standard that is equivalent to (or similar to) the IEEE std 1366. This standard concern the power distribution reliability indices. Thanks in advanced for any help. Regards, Safy

Hello, I have a question if there is IEC standard that is equivalent to (or similar to) the IEEE std 1366. This standard concern the power distribution reliability indices. Thanks in advanced for any help. Regards, Safy

Hello, A poor power factor can be improved by adding power factor correction capacitors to the plant’s distribution system. Correction capacitors provide needed reactive power (kVAr) to the load. If some thing happened by an Inadvertent mistake, and the compensated reactive (capacitive) power is...

Hello Thanks in advanced for any feedback. We are planning to use new 3x150mm2, 33kV cable, and we are trying to identify which cable is better than the other? Regarding the filler of the cable, I have noticed that there are two different types of those fillers,one is compact paste(dough), and...

According to IEC, what is the minimum clearance between the top of the MV switchgears and the roof of the building.

We intend to buy new testing equipments to our laboratory for electricity distribution network. Can anybody help me to select what suitable testing equipments to identify the accepted technical specifications for: 1- Porcelain insulators. 2- M.V XLPE cables. 3- L.V P.V.C cables. 4- Aluminum...

Hi! every body We intend to establish workshop, for repairing and maintenance of distribution transformers, and regarding the drying equipment we got different offers from the suppliers including different kinds of drying equipment: 1- Pressure-changed Vacuum Drying Equipment. 2- Hot Air...

Hi! Every body We want to use power cable 33 kV, XLPE,single core 1x400 mm2 to feed one substation outside the city, its long is about 6 kM, this cable will be buried under ground, it will be direct laid, blinded with cable laying sand 750mm. My question is there any relation between the armor...

Hi every body! Dose any one has information about the double circuit 11 kV transmission over head line? what are the dimensions of the poles and what is the clearance between the phases? Thanks in advanced for any help Regards, Safy

Hi.. every body! we want to install new power transformer, but we have problem. My question about vector group. Is there any relation between the vector group and short circuit current. one engineer told me that if I want to use the power transformer in area near the generation, I sould select...

We have old power transformer working since 1976. It is 33/11 kV, we change its oil, and treat all leaking in its body, but when we test its insulation using 5 kV Megger its insulation value was just 80 M ohm, but the temperature was 50 degree centigrade. According to the tables this value is...

I want to give the designer our requirements of MV power transformer, I need some clarifications about the ambient temperature and the temperature rise. According to IEC, the recommended limits of the temperature are: Maximum ambient temperature = 40 C Maximum top oil temperature rise = 60 C...

We have power transformer of 31.5 MVA, (about 57 ton) This transformer is designed to be installed by using metal wheels on the bottom of the transformer and metal structure on the concrete base. But is it possible to install it by putting the flat bottom of the transformer (without using...

We intend to use switchgears with vacuum circuit breakers to supply power to new project but in some sites in this project there is need to cut and supply the power for many times in one day, the operating voltage is 11 kV. My question is what is the relation between the withstand short...

Hi Can any one help me to find the relation between the withstand short circuit current and the number operations relation for vacuum and SF6 medium voltage circuit breakers. For example if I have circuit breaker with 31.5 kA at the manufacturing date (No. of operations = zero), what will be the...

We have under ground cables with rated voltage 11kV, and maximum highest voltage is 12 kV buried with sand, the earth in this area has very high humidity. If I want to make joint for this cable, what should be the specifications of this joint, should I ask for higher insulation voltage(more than...