**Transformer Oil Tan Delta Meter**, the dielectric loss (dissipation factor) measurement device Tangens-3M-3 is designed to measure the dielectric loss tangent (tan delta) of transformer oil and other liquid dielectrics.

Under the normal conditions, the device Tangens-3M-3 provides the measurement of the dielectric loss tangent (tan delta dissipation factor) (tgδ) and the capacity of liquid dielectric samples (Сх) in the ranges with basic measurement error given below:

**Transformer Oil Tan Delta Meter Features:**

·measurement range of dielectric loss tangent – from 1·10^{-4} to 0.99;

·limit of permissible absolute basic error when measuring the dielectric loss tangent1) – +(2·10^{-4} + 0.05 tgδ)%;

·range of capacity measurement at a test voltage – from 1.5 to 2 kV from 5 pF to 100 pF;

·limit of permissible basic error when measuring the capacity at a frequency of 50 Hz – 1 pF+0.01 Сх;

·limit of permissible basic error when measuring the capacity at a frequency of 54 Hz – 1 pF+0.03 Сх;

·limit of measured liquid temperature deviation from the preset temperature, °С, – +1;

·limit of permissible absolute basic error when measuring the dielectric loss tangent^{2)} – +(2.5·10^{-4} + 0.07 tgδ);

·limit of permissible relative error when measuring the RMS voltage value at a frequency of 50 Hz in the voltage measurement range – from 1 to 2 kV +3%;

·limit of permissible relative error when measuring the RMS voltage value at a frequency of 54 Hz in the voltage measurement range – from 1 to 2 kV +3%;

·limit of permissible absolute measurement error of the measured liquid dielectric temperature – +1 °С;

·heat time up to 90°C, min, – 80^{±20};

·cell volume, cm^{3}, – 60^{±2};

·single-phase AC supply voltage, V, – 220^{±22};

·power consumption, W, max, – 0.6.

**Transformer Oil Tan Delta Meter**

– For the full range of capacity measurement at a test voltage frequency of 50 Hz;

– For the full range of capacity measurement at a test voltage frequency of 54 Hz.

##### GENERAL INFORMATION

##### What is the Tan Delta Test?

Since transformer oil is used in circuit breakers, cables and switches, it is necessary to test the conditioning of the oil. This is because it strengthens the dielectric properties of the oil and hence the Tan Delta Test is used to know the condition of the oil in the transformer.

##### What is the Purpose of the Tan Delta Test?

The main purpose of the tan delta test is to ensure that the transformer operates safely and reliably. It gives the result of the insulation behavior of the windings by calculating the spread factor and capacitance values.

With the tan delta test method, the loss factor and capacitance values at the required frequency level can be easily known. Thus, any aging factor can be detected earlier and the relevant action can be taken.

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