Question { 7108 }

What is the use of doing meggering for a cable

Answer

Applying" a voltage, With two conductors that are supposed
to be insulated, the amount of insulation can vary
depending on the thickness of the insulating material, the
amount of moisture, or from being contaminated with an
electrically conductive substance. The insulation could be
thin in one or more spots due to improper manufacture, or
due to overheating, or due to applying excessive mechanical
force, etc. So,
Megging the insulation is intended to
check for any of these imperfections.

When the voltage is applied across two conductors that are
supposed to be insulated, the megohmmeter measures the
current that flows. If the current is lesss than the
specified amount, then the insulation is meeting the
specified minimum. If it fails the test, then there is a
problem such as I mentioned above.

Question { 4030 }

What is the use of insulation tester and how it is to be
used.

Answer

An insulation tester can be used to determine the integrity
of windings or cables in motors, transformers, switchgear,
and electrical installations. The test method is determined
by the type of equipment being tested and the reason for
testing.

For more information log on to:-

http://www.electricityforum.com/test-equipment/insulation-
tester.html

Question { 6742 }

What is the required value while doing the megering

Answer

For Insulation Resistance Testing with Megger for for
electrical equipments, please refer to the following
publications:

IEEE Std. 43-2000: "Recommended Practice for Testing
Insulation Resistance of Rotating Machinery"
IEEE C57.125-1991: "Guide for Failure Investigation,
Documentation and Analysis for Power Transformers and Shunt
Reactors"
NETA ATS-2003: "Acceptance Testing Specifications for
Electrical Power Distribution Equipment and System".

Question { TCS, 6932 }

what is voltage

Answer

Voltage is commonly used as a short name for electrical
potential difference.
In this introduction, the term "voltage" is however used
to mean electric potential, i.e. a hypothetically
measurable physical dimension.

Question { Wockhardt, 15550 }

What is Electrical Engineering?

Answer

Electrical engineering, sometimes referred to as electrical
and electronic engineering, is a field of engineering that
deals with the study and application of electricity,
electronics and electromagnetism.

Question { 3874 }

. Is there a simple method to measure the horsepower of a
small motor (1-3 hp) for a non-technical person

Answer

1 horsepower = 746 watts. You can calculate watts by
multiplying voltage
times amps and factoring in efficiency. You can't really
get horsepower
just from the voltage of a motor.

Log on to this link:-

http://www.elec-toolbox.com/Formulas/Motor/mtrform.htm

Question { DRJ ARDE, 4670 }

We have isolation transformer 25kvA & ONLINE UPS 15KvA
(3PHASE I/P,3PHASE O/P)where isolation should have
connect,before UPS or after please brief.

Answer

It should be connect before the Input Filter of the UPS..

Pls have a look on this Circuit Diagaram:-

http://www.tpub.com/content/doe2/spec3021/spec30210047.htm

Question { 5136 }

What is potientometer.How it is useful in a sychronoscope.

Answer

A potentiometer is a manually adjustable resistor. The way
this device works is relatively simple. One terminal of the
potentiometer is connected to a power source. Another is
hooked up to ground (a point with no voltage or resistance
and which serves as a neutral reference point), while the
third terminal runs across a strip of resistive material.
This resistive strip generally has a low resistance at one
end; its resistance gradually increases to a maximum
resistance at the other end. The third terminal serves as
the connection between the power source and ground, and is
usually interfaced to the user by means of a knob or lever.
The user can adjust the position of the third terminal
along the resistive strip in order to manually increase or
decrease resistance. By controlling resistance, a
potentiometer can determine how much current flows through
a circuit. When used to regulate current, the potentiometer
is limited by the maximum resistivity of the strip.


Visit:-http://www.wisegeek.com/what-is-a-potentiometer.htm