Schering Bridge,schering bridge theory,application of schering bridge Bridge for capacitance measurement,Schering Bridge phasor diagram,dissipation factor. The Schering Bridge is an electrical circuit used for measuring the insulating properties of electrical cables and equipment. It is an AC bridge circuit, developed by Harald Schering. It has the advantage that the balance equation is independent of frequency. patch cords Digital multimeter THEORY: Schering Bridge is the simplest method of comparing two capacitances and to determine unknown.


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It is one of the most commonly used AC bridge. The Schering bridge works on the principle of balancing the schering bridge theory on its arm. Let, C1 — capacitor whose capacitance is to be determined, r1 — a series resistance, representing the loss of the capacitor C1.

C2 — a standard capacitor The term standard capacitor means the capacitor is free from loss R3 — a schering bridge theory resistance C4 — a variable capacitor. R4 — a variable non-inductive resistance parallel with variable capacitor C4.

When the bridge is in the balanced condition, zero current schering bridge theory through the detector, which shows that the potential across the detector is zero.

The dissipation factor obtains with the help of the phasor diagram.

Schering Bridge

The dissipation factor determines the rate of loss of energy that occurs because of the oscillations of the electrical and mechanical schering bridge theory. Advantages of Schering Bridge The following are the advantages of the Schering bridge.

Balance equations are free from frequency.


The arrangement of the bridge is schering bridge theory costly as compared to the other bridges. High Voltage Schering Voltage The low voltage Schering bridge has several disadvantages, and because of this reason, the high voltage and high frequency are required for measuring the small capacitance.

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For high voltage application, the voltage is applied at the junction shown in the figure. The junction between arms 3 and 4 is earthed.


Since capacitor impedances at lower frequencies are much higher than resistances, most of the voltage will appear across capacitors.

Substituting the values of z1, z2, z3 and z4 in the above equation, we get Equating the real and schering bridge theory parts schering bridge theory the separating we get, Let us consider the phasor diagram of the above Shering bridge circuit and mark the voltage drops across ab,bc,cd and ad as e1, e3,e4 and e2 respectively.

The schering bridge theory that we have derived above is quite simple and the dissipation factor can be calculated easily. Now we are going to discuss high voltage Schering Bridge in detail. As we have discussed that simple schering bridge which uses low voltages is used for measuring dissipation factor, capacitance and measurement of other properties of insulating materials like insulating schering bridge theory etc.

Schering Bridge Measurement of Capacitance using Schering Bridge

What is the need of high voltage schering bridge? The answer to this question is very simple, for schering bridge theory measurement of small capacitance we need to apply high voltage and high frequency as compare to low voltage which suffers many disadvantages.

Let us discuss more features of this high voltage Schering Bridge: