What is the vector group of GT, UT, SUT?

What is the vector group of GT, UT, SUT?
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1 Answer

Answer :

Yd11

Dy1

Yy0 
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Related questions

Why UT, SUT secondary is rated for 6.9kV where as bus voltage is 6.6kV?

Description : Why UT, SUT secondary is rated for 6.9kV where as bus voltage is 6.6kV? 

Last Answer : The no load secondary 6.9kV voltage level adequately takes into account voltage drop during loaded condition to cater station buses at 6.6kV level. 

Why REF is provided in the LV side of SUT and UT?

Description : Why REF is provided in the LV side of SUT and UT? 

Last Answer : The LV sides of the two transformers are earthed through the resistance. This will limit the flow of current in case of LV earth fault. Hence the differential protection may not act for a LV earth fault. Hence ref protection is provided. 

Why the neutral is earthed through earthing resistance in case of UT and SUT?

Description : Why the neutral is earthed through earthing resistance in case of UT and SUT? 

Last Answer : This is done to limit the earth fault current.  

During unit operation, can we parallel UT & SUT continuously?

Description : During unit operation, can we parallel UT & SUT continuously?

Last Answer : No, due to switchgear limitation.  

What is E/F current limit for SUT and UT?

Description : What is E/F current limit for SUT and UT?

Last Answer : 400a limited by 10 ohms resistor.  

Purpose of standby E/F protection in SUT/UT?

Description : Purpose of standby E/F protection in SUT/UT? 

Last Answer : Back up for LV winding, LV neutral CT- CDG 12 – resistance earthing – relay set high time delay to discriminate with LV feeder and trip transformer if sustained E/F, also protects neutral earthing resistor.

Why REF is now is used for HV side also in GT/SUT?

Description : Why REF is now is used for HV side also in GT/SUT?

Last Answer : The E/F setting of differential is poor.  

Why vector group of SUT is chosen as Yn-Yo-Yo?

Description : Why vector group of SUT is chosen as Yn-Yo-Yo?

Last Answer : To facilitate momentary paralleling of SUT with UT on 6.6kV buses.  

What are the protections for SUT?

Description : What are the protections for SUT? 

Last Answer : a) Over current protection for phase and earth fault b) Differential protection c) HV and LV restricted earthfault protection  d) HV side directional back up over current protection for phase ... protection f) Over fluxing protection g) Buchholz and high oil, winding temperature protection. 

Why twin secondary SUT?

Description : Why twin secondary SUT? 

Last Answer : As per is, the rating single secondary power transformer is limited to 25MVA (6.6 kV) or 40 MVA (11 kV), in order to limit the 3 phase symmetrical fault level with in 26-40 kA (contribution from grid and local machines) 

During unit operation, can we parallel 2 SUT?

Description : During unit operation, can we parallel 2 SUT? 

Last Answer : No, due to switchgear limitation. 

What is the coverage of differential protection for SUT?

Description : What is the coverage of differential protection for SUT?

Last Answer : Covers from 230 kV bushing to 6.6 kV breaker end.  

What are the protections for UT?

Description : What are the protections for UT?  

Last Answer : a) Differential protection b) LV restricted earthfault protection c) LV back up earthfault and over current protection d) Buchholz and high oil, winding temperature protection. 

Why main generator/UT is not provided with separate overfluxing protection?

Description : Why main generator/UT is not provided with separate overfluxing protection?

Last Answer : Since GT is provided with overfluxing protection, it is adequate to protect main generator / UT also. Main generator can withstand higher degree of overfluxing. If a generator CB is used, separate overfluxing protection is essential for main generator. 

During unit operation can we have one UT feeding both unit 6.6 kV loads?

Description : During unit operation can we have one UT feeding both unit 6.6 kV loads? 

Last Answer : No, logically prevented.  

Where fault level is more, whether in generator bus duct or UT bus duct? Why?

Description : Where fault level is more, whether in generator bus duct or UT bus duct? Why?

Last Answer : Fault level is more in UT bus duct. Because the fault currents fed by the both generator and GT adds up within UT bus duct in case there is a fault in UT bus duct. 

The emergency electrical power source on tank vessels over 500 GT on an international voyage, should be capable of continuous operation under emergency load for _____________. A. 6 hours B. 12 hours C. 18 hours D. 24 hours

Description : The emergency electrical power source on tank vessels over 500 GT on an international voyage, should be capable of continuous operation under emergency load for _____________. A. 6 hours B. 12 hours C. 18 hours D. 24 hours

Last Answer : Answer: C

Why our GT having off load tap changer?

Description : Why our GT having off load tap changer?

Last Answer : Because our station is base load station.  

What is the advantage of Pressure relief device in TELK type GT over explosion vent of BHEL, even though in both cases oil will be expelled out during sudden pressure rise?

Description : What is the advantage of Pressure relief device in TELK type GT over explosion vent of BHEL, even though in both cases oil will be expelled out during sudden pressure rise?

Last Answer : During internal fault, the internal pressure rise is relieved by the expelling out of oil through Pressure relief device /explosion vent. However the Pressure relief device closes back when the pressure ... hazard due to transformer oil does not exist after the closure of Pressure relief device. 

What is the type of lightning arrestor for GT?

Description : What is the type of lightning arrestor for GT? 

Last Answer : Zn O (zinc oxide) types.  

Why off load tap changer was chosen for GT?

Description : Why off load tap changer was chosen for GT?

Last Answer : Because our plant works on base load always.  

How selection of cooling fluid in GT done?

Description : How selection of cooling fluid in GT done? 

Last Answer : a) There are 5 factors are there. b) Density c) Coefficient of thermal expansion d) Viscosity e) Specific heat f) Thermal conductivity. 

What are the effects of GT over fluxing?

Description : What are the effects of GT over fluxing? 

Last Answer : a. Eddy current circulation. b. Magnetising current increases c. Winding temp increases d. Transformer noise/vibration increases. e. Over heating of non laminated metal parts (affected by stray fluxes) 

What is the vector group of distribution transformer?

Description : What is the vector group of distribution transformer?

Last Answer : Dy11

Why all the transformers are having different vector group?

Description : Why all the transformers are having different vector group?  

Last Answer : UT and SUT are getting paralleled at 6.6 kV bus. Hence they should have voltage of same phase relationship. This is achieved by assigning different vector group to the transformers. 

What is the vector group of distribution transformer?

Description : What is the vector group of distribution transformer?

Last Answer : Dy11.  

____ is a highly automated group of GT machine cell. a.Flexible manufacturing system b.Group technology c.Automated system d.None of the above

Description : ____ is a highly automated group of GT machine cell. a.Flexible manufacturing system b.Group technology c.Automated system d.None of the above

Last Answer : a.Flexible manufacturing system

Good hiking/camping spots in UT and CO?

Description : Good hiking/camping spots in UT and CO?

Last Answer : Gotta hit Bryce or Zion in Utah for sure! Both are spectacular. Look into reservations for camping online first, you may need to reserve a night now with the summer tourist hub kicking into high gear. Colorado I am less sure of, traveled through but didn’t camp anywhere.

Nightlife in Mesquite (NV) and St. George (UT)?

Description : Nightlife in Mesquite (NV) and St. George (UT)?

Last Answer : Remember Utah is a semi-dry state for alcohol, so if partying is part of the equation…. you have to go through a little extra to get to a bar. Mesquite has over five or six casinos/resorts. I’ve eaten at Virgin River in Mesquite.

Should I go to grad school at UC Irvine or UT Austin?

Description : Should I go to grad school at UC Irvine or UT Austin?

Last Answer : I think that would depend entirely on each school’s program.

I'm ut mobile and I have to recharge 100 MB of data once a month, but they can't run, please advise

Description : I'm ut mobile and I have to recharge 100 MB of data once a month, but they can't run, please advise

Last Answer : Need Answer

What is the mystery greene discusses and why does he say ut is something we should all care about?

Description : What is the mystery greene discusses and why does he say ut is something we should all care about?

Last Answer : Feel Free to Answer

Moab, UT?

Description : Moab, UT?

Last Answer : Moab, UT is a great site to visit. Until the 1950's Moab did nothave much to offer. Charlie Steen discovered uranium there and thetown has grown very quickly since that time. In Moab, UT there ... using whitewater rafting or a person can rent awhitewater raft and take their own tour.Moab, UT is n

How do I go about finding a caregiver for my elderly mother in Provo, UT?

Description : How do I go about finding a caregiver for my elderly mother in Provo, UT?

Last Answer : First, check in the local community for recommendations. Even if you live far away, call your mother's pastor or someone else that she knows in the community and ask for recommendations. If ... servicemagic has licensed, bonded, insured and rated caregivers listed for provo and the service is free.

Is there a tae kwon do class offered in Salt Lake City, UT?

Description : Is there a tae kwon do class offered in Salt Lake City, UT?

Last Answer : Yes. One in particular, is Master Kwon World Class, located at 3909 Highland Drive. Their phone number is (801) 272-5444, if you would like more information.

The Union Government on 22 May 2016 appointed whom as the new Lieutenant Governor of the Union Territory (UT) of Pondicherry? (1) Kiran Bedi (2) Kalyan Singh (3) Ram Naik (4) Mukul Sangma

Description : The Union Government on 22 May 2016 appointed whom as the new Lieutenant Governor of the Union Territory (UT) of Pondicherry? (1) Kiran Bedi (2) Kalyan Singh (3) Ram Naik (4) Mukul Sangma

Last Answer : (1) Kiran Bedi Explanation: BJP leader and former IPS officer Kiran Bedi was, in May 2016, appointed Lieutenant Governor of Puducherry. The post had been lying vacant after the Narendra Modi ... The Union Territory was under the additional charge of Lt. Governor of Andaman and Nicobar Islands.

Which amongst the following States/UT has not identified tribal community? (1) Chhattisgarh (2) Haryana (3) Maharashtra (4) Karnataka

Description : Which amongst the following States/UT has not identified tribal community? (1) Chhattisgarh (2) Haryana (3) Maharashtra (4) Karnataka

Last Answer : (2) Haryana Explanation: There are 84 million Scheduled Tribe persons in India as counted in the Census of 2001. Of them, about one third are in the Central Indian region comprising ... in the northern region of Jammu and Kashmir and the adjoining districts of Himachal Pradesh and Uttarakhand.

In which States/UT s e-Stamping is currently operational? A. Gujarat B. Karnataka C. Punjab D. All of the Above E. None of the Above

Description : In which States/UT s e-Stamping is currently operational? A. Gujarat B. Karnataka C. Punjab D. All of the Above E. None of the Above

Last Answer : D. All of the Above Explanation: e-Stamping is currently operational in the States/UT s of Gujarat, Karnataka, NCT Delhi, Assam, Tamil Nadu, Rajasthan, Himachal Pradesh, Uttarakhand, UT of ... Daman & Diu, Puducherry, Uttar Pradesh, Chhattisgarh, Jharkhand, Jammu & Kashmir, Punjab and Chandigarh.

Which of the following equations is correct for Soderberg Criteria? a. (σ m / S ut ) + (σ a / S e ) = (1 / N f ) b. (σ m / S ut ) - (σ a / S e ) = (1 / N f ) c. (σ m / S yt ) + (σ a / S e ) = (1 / N f ) d. (σ m / S ut ) - (σ a / S e ) = (1 / N f )

Description : Which of the following equations is correct for Soderberg Criteria? a. (σ m / S ut ) + (σ a / S e ) = (1 / N f ) b. (σ m / S ut ) - (σ a / S e ) = (1 / N f ) c. (σ m / S yt ) + (σ a / S e ) = (1 / N f ) d. (σ m / S ut ) - (σ a / S e ) = (1 / N f )

Last Answer : c. (σ m / S yt ) + (σ a / S e ) = (1 / N f )

Cultivation of Heeng (Asafoetida) has been started in which state/ UT? a) Sikkim b) Jammu & Kashmir c) Himachal Pradesh d) Uttarakhand

Description : Cultivation of Heeng (Asafoetida) has been started in which state/ UT? a) Sikkim b) Jammu & Kashmir c) Himachal Pradesh d) Uttarakhand

Last Answer : c) Himachal Pradesh

Botanical Words Alphabetical List - UT

Description : Botanical Words Alphabetical List - UT

Last Answer : UTRICLE: A small, bladder-like, usually dry, one-seeded fruit with a thin, loose, tissue-like covering that doesn't open when ripe, such as that of an Amaranth. UTRICULAR: Pertaining to, ... producing utricles. UTRICULIFORM: Having the form of a utricle. UTRICULOID: Having the form of a bladder.

What is considered to be the oldest lake in North America? w) Mono Lake, CA x) Lake Superior, MI y) The Great Salt Lake, UT z) Crater Lake, OR

Description : What is considered to be the oldest lake in North America? w) Mono Lake, CA x) Lake Superior, MI y) The Great Salt Lake, UT z) Crater Lake, OR

Last Answer : ANSWER: W -- MONO LAKE, CA

Explain process of transmission ultrasonic testing and pulse echo UT testing.

Description : Explain process of transmission ultrasonic testing and pulse echo UT testing.

Last Answer : Transmission UT method:- In this method two different tranducers are used, one acting as a transmitter and other acting as a receiver. The transmitter convers electrical pulse into sound signal. This sound ... fed to the input of CRT is called initial pulse as shown in following diagram.

One important difference between wye-connected and delta-connected generators is that delta connections have ____________. A. line voltages equal to the vector sum of the phase voltages B. phase voltages 90° out of sync C. line current equal to the phase current D. line voltage equal to the phase voltage

Description : One important difference between wye-connected and delta-connected generators is that delta connections have ____________. A. line voltages equal to the vector sum of the phase voltages B. phase voltages 90° ... C. line current equal to the phase current D. line voltage equal to the phase voltage

Last Answer : Answer: D

What is the significance of vector grouping in Power Transformers?

Description : What is the significance of vector grouping in Power Transformers?

Last Answer : Every power transformer has a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phase difference between the ... Delta primary, Wye Secondary and the current is at 11 o clock referred to the voltage.

What is the significance of vector grouping in Power Transformers?

Description : What is the significance of vector grouping in Power Transformers?

Last Answer : A: Every power transformer carries a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phase difference between ... Delta primary, Wye Secondary and the current is at 11 o clock referred to the voltage.

What is the significance of vector grouping in Power Transformers?

Description : What is the significance of vector grouping in Power Transformers?

Last Answer : Answer:Every power transformer has a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phace difference betweent ... Delta primary, Wye Secondry and the current is at 11 o clock reffered to the voltage.

What is the significance of vector grouping in Power Transformers?

Description : What is the significance of vector grouping in Power Transformers?

Last Answer : A. Every power transformer has a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phase difference between the ... Delta primary, Wye Secondary and the current is at 11 o clock referred to the voltage.

What is vector quantity and what is scalar quantity?

Description : What is vector quantity and what is scalar quantity?

Last Answer : Vector quantity A quantity, which has both the direction and magnitude is said to be a vector quantity. Examples are force, emf, current etc. Scalar quantity A scalar quantity is that, which has only magnitude but no direction. Examples are temperature, mass, volume etc.

Is it a wise choice to upgrade my GeForce GT 440 to GTS 450?

Description : Is it a wise choice to upgrade my GeForce GT 440 to GTS 450?

Last Answer : answer:GTX or GTFO. Seriously, given the price of the lower GTX-series compared to the performance, the GTS series isn’t worthwhile. Or, if you don’t mind AMD, the R7 is a good value. The R7 260X runs around $100–120 and is twice as powerful as the GTS450.