Answer / pyobik

Sub-Station classification:
1. According to service requirement
a) Transformer sub-station
b) Switching sub-station
c) power factor sub-station
d) Frequency changing sub-station
e) Converting sub-station
2. According to constructional features
a) Indoor sub-station
b) Outdoor sub-station
c) Under ground sub-station
d) Pole mounted sub-station

Answer / nilkanth.

There are mainly three types of sub-stations.
1.step up/down substations-where stepping up or stepping
down of voltage has done.
2.power factor improvement sub station-where power factor
is improved by installing capacitor banks or synchronous
condensors.
3.switching sub stations- Where switching action like
switching on or off has done for maintenance purposes for
other reasons.
4.poll mounted substation, Underground substation

Answer / rajesh

There are mainly three types of sub-stations.
1.step up/down substations-where stepping up or stepping
down of voltage has done.
2.power factor improvement sub station-where power factor
is improved by installing capacitor banks or synchronous
condensors.
3.switching sub stations- Where switching action like
switching on or off has done for maintenance purposes for
other reasons.

Answer / rvg.msceb

These are main types of sub-stations.
1.at generating stations: step up voltage to higher level
2.at intermediate stations: step down voltage to lower level
say 400Kv to 11kv, and power factor improvement may be also
doing within these sub station

3.At load center: Where voltage is getting down to 400volts,
and this is near to be load center

Answer / abdul nazir

Only two types.
1. Indoor substation
2. Outdoor substation.

Answer / subrat kumar das

generally four types of substation.thes are
Step-up Transmission Substation
Step-down Transmission Substation
Distribution Substation
Underground Distribution Substatione are

Answer / vijendra joglekar

Types of sub station:
1)Pole mounted type sub station
(for low rating up to 100 kvA)
2)Outdoar type sub station
(for voltage upto 11kv to 132kv)
3)Indoar type sub station
(for voltage local sub station primary voltage
11kv,secondary voltage 400/440 volts)

Answer / virendra joshi

Here are the diffrent kind of substation.
1. Step up / step down substation
2. Power factor improvement substation
3. frequrecy changing sub-station
4. HVDC substation.
5. Outdoor substation
6. Indoor Substation
7. Grid Station ( Regional , National )

Answer / r.ramadhivya

1.Generating substation
2.grid substation
3.secondary substation
4.distribution substation
5.special purpose of substation

Answer / gayatri

type of sub-station
1. outdoor sub-station
a) pole mounted sub-station
b) foundation mounted sub-station
2. indoor sub-station

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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

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