What are the in-built protections provided in MCC cell?

What are the in-built protections provided in MCC cell? 
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1 Answer

Answer :

Fuses for short circuit protection.

OLR for over load and single phasing protection.

Electrical and Mechanical interlock in valve cell against short circuit. 
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Related questions

What are the built in protections provided in 415 V breaker?

Description : What are the built in protections provided in 415 V breaker?  

Last Answer : a. DINF (making current magnetic release) This consists of a laminated magnetic circuit. This is placed under the lower current terminal pole. This is provided for all the three poles. It has a core that rotates ... by a lever. It is placed in front of the breaker. Setting range is 60% to 100%.  

What is the safety interlock provided in MCC cell?

Description : What is the safety interlock provided in MCC cell? 

Last Answer : The MCC cell door can't open if the cell is in on condition.  

What is interlocks provided for the valve MCC

Description : What is interlocks provided for the valve MCC 

Last Answer : a) Mechanical interlock, which will not allow the other contactor to close if one contactor, is closed. b) 42 auxiliary contacts are wired in the control ckt. 42-1 contact in 42-2 and 42-2 contact in 42-1. 

What are the built in protections for transformers?

Description : What are the built in protections for transformers?

Last Answer : a) Buchholz relay b) Explosion vent or relief valve c) Gas operated relay for on load tap changers. 

What are the protections provided for DG?

Description : What are the protections provided for DG?

Last Answer : 1. Differential protection (87). 2. Over speed of engine. 3. Reverse power protection (in LOCA condition time delay). 4. Low lubricating oil pressure. 5. Cooling water temperature high. 6. 6 ... 8. Emergency stops push button. In LOCA condition 4 - 8 protections are not permitted to operate. 

What are the protections provided in charger?

Description : What are the protections provided in charger?  

Last Answer : 1. Over load (49). 2. Over voltage (59). 3. Short-circuit (3250 Amps). 4. Phase sequence and phase fail. 5. di/dt and dv/dt protection. 

What are the protections provided in PMCC circuit breakers?

Description : What are the protections provided in PMCC circuit breakers?

Last Answer : 1. IDMT O/C (CDG 34). 2. IDMT E/F (CDG 11).  3. Under voltage (40% of 110V). 

What are the protections provided for motor feeder?

Description : What are the protections provided for motor feeder?  

Last Answer : Ith - Thermal over load I2S - Unbalance load I0S - Earth fault protection I1t - Stalling protection I1Inst. - Short circuit protection 

Why all 415V transformers are chosen Dyn 11? What are the protections provided for the 415V transformers?

Description : Why all 415V transformers are chosen Dyn 11? What are the protections provided for the 415V transformers?

Last Answer : a) To facilitate interchange. b) To have momentary parallel during changeover. Protections a) Door interlock to trip HT and LT breakers. b) LT breaker can on only after HT breaker is in on position. c) ... and restricted E/F (51N + 64). f) Winding temp high trip (140°C trip and 130°C alarm) 

What are the protections provided for 220 kV lines and bus bars?

Description : What are the protections provided for 220 kV lines and bus bars? 

Last Answer : a. Bus bar differential protection. b. Distance protection. c. Over current protection. d. Earth fault protection. 

Why 110V has been chosen in MCC cell?

Description : Why 110V has been chosen in MCC cell? 

Last Answer : To isolate control circuit from power circuit for Human safety at control circuit side.  

State the types of protections provided by MCB.

Description : State the types of protections provided by MCB. 

Last Answer : The types of protections provided by MCB: 1. MCB provides short circuit protection. 2. MCB provides overload protection

What is the safety reason to keep the contactor / MCC remote from motor?

Description : What is the safety reason to keep the contactor / MCC remote from motor?  

Last Answer : Contactor = sparking equipment. Not suiting for hazardous location.  

What is the maximum load on MCC?

Description : What is the maximum load on MCC?

Last Answer : 3 Phase load upto 90 kW are fed by MCC. 

Write details MCC construction.

Description : Write details MCC construction. 

Last Answer : a) MCC are made up of sheet steel enclosure, indoor floor mounting and free standing, Dust and vermin proof, modular type and of double front and single front (X1, Y1). b) Degree of protection is IP 50 ... SRPH MCC are safety related and SB, TB, RAB, CWPH, DM Plant MCC's are non safety related. 

What maintenance checks you will do for an MCC cells and MCC panel?

Description : What maintenance checks you will do for an MCC cells and MCC panel?

Last Answer : Maintenance checks on MCC cells a. Ensure that the load is tripped from control room and switch is in off position. Switch off the isolator at MCC cell. b. Open the door and rack ... See for proper earthing connection and tightness of the earthing connections. l. See for proper house keeping. 

What type of motor starting adopted in MCC?

Description : What type of motor starting adopted in MCC?

Last Answer : DOL (direct on line) starter.  

What are the advantages of MCC?

Description : What are the advantages of MCC? 

Last Answer : a. Starters and contactors all will be a standard size. b. Spares inventory will be less. c. Cost of cables will be less because same size of cable is used for all capacity and gland holes can be provided before hand. d. Maintenance and trouble shooting is easier in MCC. 

What are the different Generator Protections employed in Thermal Power Plants?

Description : What are the different Generator Protections employed in Thermal Power Plants?

Last Answer : Answer: Faults in the windings, Over load protection, Over heating of windings or bearings, Over speed protection, Loss of Excitation protection, Motoring operation protection, Inadvertent ... , out of step operation protection, sub-synchronous oscillations protection and earth fault protection

What are the different Generator Protections employed in Thermal Power Plants?

Description : What are the different Generator Protections employed in Thermal Power Plants?

Last Answer : Faults in the windings, Over load protection, Over heating of windings or bearings, Over speed protection, Loss of Excitation protection, Motoring operation protection, Inadvertent energisation ... , out of step operation protection, sub-synchronous oscillations protection and earth fault protection

What are the protections used in 415 V Class II side?

Description : What are the protections used in 415 V Class II side?

Last Answer : LV to UPS 1. CTZM 2. 50 (instantaneous over current) 3. short circuit UPS to PMCC S & T 1. 51 RYB (inverse over current) 2. 27 (under voltage) 3. 51N (earth fault) From Class III to Class II tie CTZM at Class III and 51, 51N at Class II. 

What are the protections used in Class III & Class IV 415 V LV side?

Description : What are the protections used in Class III & Class IV 415 V LV side?  

Last Answer : Class III 415 V LV side 1. 51 (inverse over current) 2. 50 (instantaneous over current) 3. 27 (under voltage) 4. 51N (earth fault) 5. 64 (REF)  Class IV 415 V LV side 1. 51 RYB (inverse over current) 2. 51N (earth fault) 

What are the protections adopted in UPS or PMCC supply?

Description : What are the protections adopted in UPS or PMCC supply?

Last Answer : LV (incomer) or UPS input CTZM, Over current, Short circuit protections PMCC S or T input or UPS output Under voltage (27), 51RYB, 51N protections. 

What are the protections are there for lines?

Description : What are the protections are there for lines?  

Last Answer : Directional earthfault protection Directional over current protection Local breaker back up protection Pole discrepancy Main protection (distance protection)

What are the protections are there for BUSBAR?

Description : What are the protections are there for BUSBAR?

Last Answer : Instantaneous over current protection Bus bar differential protection Local breaker back up protection 

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. 

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. 

What are the protections for GENERATOR TRANSFORMER?

Description : What are the protections for GENERATOR TRANSFORMER?  

Last Answer : a) Differential protection b) Restricted earthfault protection c) Backup earthfault protection d) GT phase back up protection e) Overfluxing protection f) Oil surge (gas) protection g) High winding temperature and oil temperature protection. 

What are the working principles of generator main protections?

Description : What are the working principles of generator main protections?

Last Answer : GENERATOR START UP PROTECTIONS SUPPLEMENTARY PROTECTION OF GENERATOR The generator is normally expected to run rated speed before excitation power is applied by closing the field breaker. ... position to ensure that the protection is inoperable when the machine is connected to grid.  

What is the full form of 'MCC' ? -How To ?

Description : What is the full form of 'MCC' ? -How To ?

Last Answer : The full form of 'MCC' is Maoist Communist Centre

What is the full form of MCC ?

Description : What is the full form of MCC ?

Last Answer : The full version of MCC is Marylebone Cricket Club (London).

What is the full form of MCC ?

Last Answer : MCC - Melbourne Cricket Club

MCC is investigating the improvement of the relationship between people and computers through a technology called ___________ a) computer-aided design b) human factors c) parallel processing d) all of the mentioned

Description : MCC is investigating the improvement of the relationship between people and computers through a technology called ___________ a) computer-aided design b) human factors c) parallel processing d) all of the mentioned

Last Answer : b) human factors

The new organization established to implement the Fifth Generation Project is called _____________ a) ICOT (Institute for New Generation Computer Technology) b) MITI (Ministry of International Trade and Industry) c) MCC (Microelectronics and Computer Technology Corporation) d) SCP (Strategic Computing Program)

Description : The new organization established to implement the Fifth Generation Project is called _____________ a) ICOT (Institute for New Generation Computer Technology) b) MITI (Ministry of International ... c) MCC (Microelectronics and Computer Technology Corporation) d) SCP (Strategic Computing Program)

Last Answer : a) ICOT (Institute for New Generation Computer Technology)

MCC includes ______ types of cloud resources A. 2 B. 3 C. 4 D. 5

Description : MCC includes ______ types of cloud resources A. 2 B. 3 C. 4 D. 5

Last Answer : 4

Why are children considered deserving of protections that other weak or powerless individuals do not get?

Description : Why are children considered deserving of protections that other weak or powerless individuals do not get?

Last Answer : We do have protections in place. Every state has an Adult Protective Services division and that people are allowed to file bankruptcy rather than be held totally responsible for their debts is a form of protecting ... 't we can only protect them so far and so much and then they are on their own.

What store sells laptop protections?

Description : What store sells laptop protections?

Last Answer : Best Buy would have laptop protectors. And yes it would be a good investment to buy one for your laptop. It will protect your laptop from getting scratched or dinged from being dropped.

How are circuits protections devices connected to the circuit they are intended to protect and why are they connected in this way?

Description : How are circuits protections devices connected to the circuit they are intended to protect and why are they connected in this way?

Last Answer : In series, so total current will be stopped when the device opens.

A carpenter built a new house on some property he owned. When he went to inspect his new house, he observed a large animal had taken up residence in the new house. However, the carpenter was not surprised by this. He made no attempt to chase the large animal from the house, nor did he call animal control to have the animal removed. In fact, he provided food and water to the animal on an ongoing basis at his own expense. Why wasn't the carpenter upset about the animal living in his newly built house? -Riddles

Description : A carpenter built a new house on some property he owned. When he went to inspect his new house, he observed a large animal had taken up residence in the new house. However, the carpenter was ... own expense. Why wasn't the carpenter upset about the animal living in his newly built house? -Riddles

Last Answer : The new house the carpenter had just built was a dog house. He built it for the new dog he had just purchased ----- a massive Saint Bernard.

Drop manholes at the junctions of sewer lines, are provided if A. Invert level of a branch sewer is more than 60 cm that of the main sewer B. Sewer line runs along a main road C. Ordinary manhole cannot be built D. Two sewer lines intersect

Description : Drop manholes at the junctions of sewer lines, are provided if A. Invert level of a branch sewer is more than 60 cm that of the main sewer B. Sewer line runs along a main road C. Ordinary manhole cannot be built D. Two sewer lines intersect

Last Answer : ANS: A

A loss of field excitation to an AC generator while operating in parallel will cause it to ____________. A. absorb more and more load due to decreased armature reaction B. lose its load due to the inherent speed droop built into the governor C. smoke and overload due to field flashover as residual field flux changes polarity D. lose its load, begin to motorize, trip out on reverse power relay, and possibly overspeed

Description : A loss of field excitation to an AC generator while operating in parallel will cause it to ____________. A. absorb more and more load due to decreased armature reaction B. lose its load due to ... polarity D. lose its load, begin to motorize, trip out on reverse power relay, and possibly overspeed

Last Answer : Answer: D

Unnecessary and frequent applications of varnish to the generator windings to repair defective insulation will result in ____________. A. heavy coatings of varnish interfering with heat dissipation B. deficient air gap clearance and eventual damage to the casing C. failure of the rectifier assembly D. a built-up of varnish without changing generator operation

Description : Unnecessary and frequent applications of varnish to the generator windings to repair defective insulation will result in ____________. A. heavy coatings of varnish interfering with heat dissipation B. ... of the rectifier assembly D. a built-up of varnish without changing generator operation

Last Answer : Answer: A

If a circuit breaker that utilizes built-in, current limiting fuses (CLF's) cannot be closed, the problem may be traced to __________. A. a blown CLF plunger holding the trip bar in the open position B. a missing CLF C. a misaligned limiter housing assembly D. all of the above

Description : If a circuit breaker that utilizes built-in, current limiting fuses (CLF's) cannot be closed, the problem may be traced to __________. A. a blown CLF plunger holding the trip bar in the open position B. a missing CLF C. a misaligned limiter housing assembly D. all of the above

Last Answer : Answer: D

What is the in built protection for transformer?

Description : What is the in built protection for transformer?

Last Answer : PRV to protect from over pressurization of tank due to the release of gases, oil etc. This is the replacement for the explosion vent. 

Stones are provided in the substation to: a) To avoid fire accident by draining oil from transformer if leaks b) To avoid growing of weeds and plants c) To provide insulation d) All the above

Description : Stones are provided in the substation to: a) To avoid fire accident by draining oil from transformer if leaks b) To avoid growing of weeds and plants c) To provide insulation d) All the above

Last Answer : Ans: D

Coast Guard Regulations (46 CFR) require that each alternating current generator arranged for parallel operation shall be provided with _____________. A. more than one means of excitation B. individual circuit fuses C. a high back-pressure trip D. a reverse-power trip

Description : Coast Guard Regulations (46 CFR) require that each alternating current generator arranged for parallel operation shall be provided with _____________. A. more than one means of excitation B. individual circuit fuses C. a high back-pressure trip D. a reverse-power trip

Last Answer : Answer: D

Where automatic restart does not present a hazard after a power failure, Coast Guard Regulations (46 CFR) require motor controllers for auxiliaries vital to the propelling equipment to be provided with ________________. A. overload protection B. low voltage protection C. low voltage release D. reverse current protection

Description : Where automatic restart does not present a hazard after a power failure, Coast Guard Regulations (46 CFR) require motor controllers for auxiliaries vital to the propelling equipment to be provided ... overload protection B. low voltage protection C. low voltage release D. reverse current protection

Last Answer : Answer: C

Which of the following is/are true concerning electric power operated watertight door systems? A. Each motor driven door must use the main bus as its source of power. B. Each distribution panel for the system must be on the lowest level where berthing quarters are located. C. Distribution panels must not be provided with a means of locking in order to permit quick activation of the system. D. Each system must have a separate branch circuit.

Description : Which of the following is/are true concerning electric power operated watertight door systems? A. Each motor driven door must use the main bus as its source of power. B. Each distribution panel for ... to permit quick activation of the system. D. Each system must have a separate branch circuit.

Last Answer : Answer: D

Which of the listed safety features should be provided in small rooms or lockers where batteries are stored? A. Installation of a fixed CO2 system. B. An exhaust duct is to be provided and led from within three inches of the deck. C. Power ventilation is to be provided if trickle charging is utilized. D. An exhaust duct is to be provided and led from the top of the locker to the open air.

Description : Which of the listed safety features should be provided in small rooms or lockers where batteries are stored? A. Installation of a fixed CO2 system. B. An exhaust duct is to be provided and led from within ... An exhaust duct is to be provided and led from the top of the locker to the open air.

Last Answer : Answer: D