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Anderson Bridge

The document discusses the Anderson bridge, which measures self-inductance by comparing an unknown inductance to a standard fixed capacitance. It describes the construction of the Anderson bridge with four arms, one containing an unknown inductance. It also shows the phasor diagram and provides the theory and equations for calculating inductance using the bridge.

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97 views10 pages

Anderson Bridge

The document discusses the Anderson bridge, which measures self-inductance by comparing an unknown inductance to a standard fixed capacitance. It describes the construction of the Anderson bridge with four arms, one containing an unknown inductance. It also shows the phasor diagram and provides the theory and equations for calculating inductance using the bridge.

Uploaded by

kukulilika
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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EMMI-1 PRESENTATION ON

ANDERSON BRIDGE

PRESENTED BY Biju Roy


Roll No :- BOP/22/EL/013
Semester:- 4th
Branch :- Electrical Engineering
Definition

The Anderson’s bridge gives the accurate


measurement of self-inductance of the circuit.
The bridge is the advanced form of Maxwell’s
inductance capacitance bridge. In Anderson
bridge, the unknown inductance is compared
with the standard fixed capacitance which is
connected between the two arms of the bridge.
Constructions of Anderson’s Bridge

The bridge has fours arms ab, bc, cd,


and ad. The arm ab consists unknown
inductance along with the resistance.
And the other three arms consist the
purely resistive arms connected in
series with the circuit.
The static capacitor and the
variable resistor are connected in
series and placed in parallel with the
cd arm. The voltage source is applied
to the terminal a and c.
Phasor Diagram of Anderson’s Bridge

 The phasor diagram of the Anderson bridge


is shown in the figure below. The current I1
and the E3 are in phase and represented on
the horizontal axis. When the bridge is in
balance condition the voltage across the
arm bc and ec are equal.
Theory of Anderson Bridge

Let, L1 – unknown inductance having a resistance R1.


R2, R3, R4 – known non-inductive resistance
C4 – standard capacitor

At balance Condition,

Now,

The other balance condition equation is expressed as

By substituting the value of Ic in the above equation we get,

and

on equating the equation, we get

Equating the real and the imaginary part, we get


Problem:-
Advantages of Anderson Bridge

 The balance point is easily obtained on the


Anderson bridge as compared to Maxwell’s
inductance capacitance bridge.
 The bridge uses fixed capacitor because of which
accurate reading is obtained.
 The bridge measures the accurate capacitances
in terms of inductances.
Disadvantages of Anderson Bridge

 The circuit has more arms which make it


more complex as compared to Maxwell’s
bridge. The equation of the bridge is also
more complex.
 The bridge has an additional junction which
arises the difficulty in shielding the bridge.
THNAK YOU

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