What is a TTR in electrical?
What is a TTR in electrical?
The Transformer Turns Ratio tester (TTR) is device used to measure the turns ratio between the windings (example shown below). Voltage is applied on the H marked leads and measured of the X marked lead by the test set.
What is the difference between IR and PI test?
PI is a variation of the IR test. It is the ratio of IR measured after voltage has been applied for 10 minutes (R10) to the IR measured after one minute (R1), i.e. V is the DC Voltage applied and It is the current flowing in the circuit.
What is magnetic leakage in transformer?
This flux is called leakage flux which will pass through the winding insulation and transformer insulating oil instead of passing through core. Due to this leakage flux in transformer, both primary and secondary windings have leakage reactance. This phenomenon in transformer is known as Magnetic leakage.
What is voltage ratio?
The voltage of the windings in a transformer is directly proportional to the number of turns on the coils. The ratio of primary voltage to secondary voltage is known as the voltage ratio (VR). As mentioned previously, the ratio of primary turns of wire to secondary turns of wire is known as the turns ratio (TR).
What is pi value of motor?
| Interpretation of Polarisation Index results | |
|---|---|
| PI | Condition of item under test |
| 1 – 1.5 | Bad |
| 1.5 – 2.0 | Doubtful |
| 2.0 – 3.0 | Adequate |
What do you need to know about the TTR test?
The transformer turns ratio test, or TTR test, confirms that the transformer has the correct ratio of primary turns to secondary turns. Using this test correctly can help to identify tap changer performance, shorted turns, open windings, incorrect winding connections and other faults inside transformers.
What does TTR stand for in power transformer?
The Transformer Turns Ratio tester (TTR) is device used to measure the turns ratio between the windings (example shown below).
What does the turns ratio test tell you?
Turns ratio testing. The transformer turns ratio test, or TTR test, confirms that the transformer has the correct ratio of primary turns to secondary turns. Using this test correctly can help to identify tap changer performance, shorted turns, open windings, incorrect winding connections and other faults inside transformers.
Can a TTR test be done with x0?
With delta connected windings, X0 is not used. It is possible to test single phase two-winding transformers with a three-phase TTR test set by only utilizing the H1, H2 and X1, X2 leads.