Lower current/lower conductor sizes/lower contact sizes.
A tap changer is used on the high voltage (HV) side of a transformer to adjust the voltage ratio and maintain a desired voltage level under varying load conditions. It allows for voltage regulation and compensates for voltage fluctuations in the power system. By changing the number of turns in the transformer winding, the tap changer can increase or decrease the voltage output, ensuring a stable and reliable power supply.
It's common to put arcing horns on the HV side of a power transformer to short out voltage spikes arriving from lightning strikes along the line.
A CT is a measuring device but does not step up or step down voltage like a transformer will.
It is carried out by tap-changing on the HV side of the transformer. The number of turns on the winding is increased or decreased by a number of turns to make the secoondary voltage take the right value. Tap-changing is done on the HV side because each turn is a smaller percentage of the voltage, which permits finer adjustment.
The size of any switch depends on current it carries. Your statement is true for step down transformers. The primary is HV hence less current, so the tap changer is on primary side.
insulation tester (Megger) can used to checked the short circuit on HV side. HI POT tester is also a means to checked the shot circuit in HV cable.
To ascertain the life of insulation, or effectiveness of the insulation (HV to LV, HV to earth and LV to earth) of the transformer
It's common to put arcing horns on the HV side of a power transformer to short out voltage spikes arriving from lightning strikes along the line.
put a MV transformer in the middle 4x ins. HV cables on top and bottom of the middle. on the left of the middle put a electronic circut and on the right put a energy Crystal
A CT is a measuring device but does not step up or step down voltage like a transformer will.
This is 3 Nos Two Winding Transformers put together to form of Three Phase transformer, HV is Star Connected & LV is Delta Connected in the LV phase is leading by 30 Degree with respect to HV phase
It is a Step-Up Transformer which has 2 times voltage in secondary(HV) than primary(LV)
It is carried out by tap-changing on the HV side of the transformer. The number of turns on the winding is increased or decreased by a number of turns to make the secoondary voltage take the right value. Tap-changing is done on the HV side because each turn is a smaller percentage of the voltage, which permits finer adjustment.
in hv side, current will be less; so if we vary the rheostate, than thetre is less arcing with respect to lv side, so we always put the tap changer in hv side.
For carrying Short Circuit Test on Power Transformer Do the following: 1] Isolate the Power Transformer from service. 2] Remove HV/LV Jumps and Disconnect Neutral from Earth/Ground. 3] Short LV Phases by Cu/Al plate which could withstand short circuit current and connect these short circuited terminals to Neutral 4] Energise HV side by LV supply (440 3ph Supply) with OLTC tap position on Normal. 5] Measure Current in Neutral, LV line voltages, HV Volatage and HV Line Currents on various OLTC Tap position. Analysis: If Neutral current is near to zero transformer windings are OK If Neutral current is higher or equal to Line current between LV Phase one of the winding is Open.
i understand that YNaOd1 represent an auto transformer with HV winding as wye connected and loaded tertiary. Please correct me if i am wrong.
The size of any switch depends on current it carries. Your statement is true for step down transformers. The primary is HV hence less current, so the tap changer is on primary side.
insulation tester (Megger) can used to checked the short circuit on HV side. HI POT tester is also a means to checked the shot circuit in HV cable.