The stabilised output is connected across the remote potentiometer and one side of the indicator. The other side of the indicator is connected to the potentiometer moving contact. When the position of this contact is changed, the current through the indicator alters in proportion, giving a change of indication.
What is a tap position?
Tap Position Indicator is used to indicate the Tap number of the power Transformer on On Load Tap Changer (OLTC).
What is automatic voltage regulating relay?
Automatic Voltage Regulating Relay (AVR) is used to Regulate the secondary voltage of Power and Distribution Transformers via On-Load Tap Changer (OLTC). EE-301E : Economy AVR.
What is nominal tap position?
The tap position for an LTC transformer is indicated on the oneline by the number of tap step positions from the nominal position (i.e., the position when the off-nominal tap ratio is equal to 1.0). The tap position can be changed manually only when the transformer has been set off automatic voltage control.
Why tapping is provided on HV side?
The tap changer is placed on high voltage side because: Because of high voltage the current through the HV winding is less compared to LV windings, hence there is less “wear” on the tap changer contacts. Due this low current, in on load tap changer the change over spark will be less.
What is voltage tap?
Voltage taps make direct connections with transformer windings. A whole number of turns is needed between voltage-tap leads or else one will be on the transformer’s wrong side. Voltage-tap switches are typically included in an installation to allow for the execution of actions requiring that a transformer be shut off.
In which side tapping is provided?
In case of smaller size transformer, the tapping is provided on the low voltage side because, Low Voltage winding is wound over on high voltage winding. The current of low voltage winding not sufficient to create sparking or ARC.
What is LV and HV side of transformer?
The test is conducted on the high-voltage (HV) side of the transformer where the low-voltage (LV) side or the secondary is short circuited. A wattmeter is connected to the primary. An ammeter is connected in series with the primary winding.
