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Why oltc is situated on primary side of traformer?
oltc is situated on primary side of transformer because by primary side we can obtain fine voltage change by tapping with low current flow through it.
What is the mean by OLTC related to trasnformer?
It means 'on-load tap changer' - I found a page in Wikipedia that explains it - see related link. Read the section titled 'Voltage considerations'
Operation of on load tap changer in transformers?
OLTC - INSTALLED IN THE PRIMARY SIDE OF A POWER TRANSFORMER TO SELECT OR ADJUST VOLTAGE. THE ADVANTAGE OF THIS IS FOR SOLVING THE VOLTAGE DROP ISSUES IN THE SECONDARY OUTPUT IN THE FARTHEST LOCATION. FOR EXAMPLE YOUR SECONDARY VOLTAGE REQUIREMENT IS 380 VOLTS AND YOU CAN ADJUST TO 400 VOLTS FOR LONG CABLE RUNS.
What is rtcc pannel?
RTCC (Remote tap changer control) panel is one of the LT panel which has microcontroller, contactors, relays etc it senses the fluctuation in distribution voltage (input of Transformer) & give signal to OLTC to change the voltage(Output of the transformer) to set a value
What main by OCTC and OLTC in the transformer?
OCTC means off circuit tap changer (off load tap changer) and OLTC means on load tap changer. in octc we can change the tap position while the transformer is in off condition only. we can not change the tap position of octc in charged condtion of the transformer. the tap position of octc can be change in deenrgise condion of transformer only means if you nwant to chang the tap position firstly you will have to deenrgise the power transformer then you can change the tap position of octc.while in oltc we can change the tap position of OLTC in charged condition of power transformer. This is the basic diffirence between OCTC and OLTC.generally the OCTC used in single phase generating transformer (G.T.Power Transformer) and OLTC used in three phase powwer transformers like standby transformer and auto transformer in power plants and switch yards. for any other question please mail me at (ashu_uit2007@yahoo.co.in )
What does OSR do in transformer?
OSR meance oil surge relay & it is used in x'mer OLTC . it is measured if any surge produce in oil then the give the signsl to relay panel for tripping of transformer
What are the types of tap changing transformer?
The simplest type of tap-changing mechanism is a rotary switch which allows the distribution company to select one of several 'tapping' (connection) points on the high-voltage side of a transformer. This enables the turns-ratio of the transformer to be adjusted to slightly elevate or reduce the output voltage if required. This type of tap changer is termed an 'off-load' tap changer, because it cannot be operated when the transformer is energised because the winding is temporarily disconnected as the mechanism's contacts move from one tap to the next. Off-load tap changers are operated manually, using a handle located outside the transformer -after the transformer has been de-energised, isolated, and safety earths (ground) applied.More complicated is the motor-driven 'on-load' tap-changing mechanism. It, too, alters the turns-ratio of a transformer, but this is done (usually) automaticallyaccording to changes in load. Unlike the 'off-load' mechanism, the high-voltage winding is never temporarily disconnected as the mechanism's contacts move from one tap to the next. This is because a pair of contacts is involved. One contact moves to the new tap position while the second remains at the first tap connection; when this has been done, the second contact follows the first onto the new tap position -so there is no break in the circuit. Additionally, there might be surge-suppressors fitted, to limit current surges during the tap-changing operation.Tap changers are always fitted to the high-voltage windings, where the current is lower -thus enabling smaller contacts to be used.
What is a transformer protector?
The TRANSFORMER PROTECTOR is a transformerexplosion and fire prevention system suitable for any type of oil-immersed transformer and including surrounding equipment such as the On Load Tap Changer (OLTC), Oil Cable Box (OCB), and Oil Bushing Cable Box (OBCB).
How do you carry short circuit test on power transformer?
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.
How do you carry out short circuit test on power transformers?
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.
What are the Relays in transformer?
There are many types of protection relays used in transformers depend upon its construction, size, use etc. They are 1. Buchholz relay for incipient faults like short ciruit, winding temparature protection, oil temparature protection, oil level protection, oil pressure protection, Pressure relief valve (for oil filled transformers) 2. Differential protection 3. Thermal Protection 4. Earth fault protection 5. Over current protection 6. Over excitation protection(where OLTC is used) etc
