Hydropower Plant,Substation/Electrical Machine Repair and Maintenance

  • Home
  • Nepal
  • Butwal
  • Hydropower Plant,Substation/Electrical Machine Repair and Maintenance

Hydropower Plant,Substation/Electrical Machine Repair and Maintenance Local consultant for Repair and maintenance of 132/33/11kV Substation Components/ Small Hydropower Plant's Electrical Components

GIS (Gas Insulated Switchgear) Typical Arrangement.....
10/06/2015

GIS (Gas Insulated Switchgear) Typical Arrangement.....

Transformer Differential Protection Scheme..........
05/06/2015

Transformer Differential Protection Scheme..........

21/05/2015

Are you filling Oil in to the transformer? Check your Oil insulating properties. The Oil minimun BDV(Break Down Voltage) value should be 30kV/2.5mm otherwise your transformer may cause considerable demage.

13/04/2015

Do you know ? the short circuit current generally 10 times of normal rated current.

27/02/2015

What is corona?
Ans: The phenomenon of voilet glow,hissing noise and production of ozen gas in an overhead transmission line is known as Corona.
Factors affecting Corona:
1.Atmosphare
2.Conductor Size
3.Spacing between conductor
4.Line voltage
Advantage of Corona:
1. Due to corona formation the air sourring the conductor becomes conducting and hence virtual diameter of conductor is increase. And increase diameter reduces the electrostatic stess between conductors.
2.Corona reduces the effects of transients production by surges.
Disadvantage
1.Corona accompanied by a loss of energy and effects transmission efficiency of line.
2.Ozen is produces by corona which may cause corrosion of conductor due to chemical action.
3.Corona cause inductive interfarance with neighbour communication line.

26/12/2014

Electrical Circuit Briedge and Use to Measures:
A.Wheatstone Bridge - Unknown Resistance
B.Wien Bridge-Measure Hz
C.Maxwell Briedge- Measures Unknown inductance.
D. Kelvin bridge(Thomas)-Measures Unknown Resistance below 1ohm.
E.Schering Bridge- Measures Unknown capacitance.

19/12/2014

An ideal transformer is one that has:
1.No winding resistance.
2.No leakage flux(same flux links both winding).
3.No iron losses in the core.

Ohm law..........V=IR (Copied)
30/10/2014

Ohm law..........V=IR (Copied)

Alternator Static Excitation System
23/09/2014

Alternator Static Excitation System

10/09/2014

What is load shedding?
Load-shedding is:
When there is not enough electricity
available to meet the demand from all
customers, it could be necessary
to interrupt supply to certain areas. This
is called load shedding. It is different
from a power outage that could occur
for several other reasons.
It is a last resort to balance electricity
supply and demand. We will only apply
load-shedding when all other options
have been exhausted.
It is an effective way to avoid total
collapse of the electricity supply grid (a
national black-out) which will have
disastrous outcomes for the country. If
unbalances on the power is not
managed this could lead to the risk of
collapse of the entire power network. If
this occurs, it could take more than a
hour to restore power to the entire
country. By rotating and shedding the
load in a planned and controlled
manner, the system remains stable.

10/09/2014

Q. The size of the earth or ground wire is
based on the:
a) maximum fault current carrying through
the ground wire
b) rated current carrying capacity of the
service line
c) depends on the soil resistance
d) both (a) and (c)

10/09/2014

Residual voltage transformer (RVT): RVTs
are used for residual earth fault protection
and for discharging capacitor banks. The
secondary residual voltage winding is
connected in open delta. Under normal
conditions of operation, there is no voltage
output across the residual voltage winding.
When there is an earth fault, a voltage is
developed across the open delta winding
which activates the relay. When using a
three phase RVT, the primary neutral
should be earthed, as otherwise third
harmonic voltages will appear across the
residual winding. 3 phase RVTs typically
have 5 limb construction.

Address

Milanchok
Butwal
00977

Telephone

9148189612

Website

Alerts

Be the first to know and let us send you an email when Hydropower Plant,Substation/Electrical Machine Repair and Maintenance posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to Hydropower Plant,Substation/Electrical Machine Repair and Maintenance:

Shortcuts

Share

Category