1. To restore class III when class IV supply fails.
2. To extend supply to class II when UPS fails.
3. In one DG condition to load restoration.
4. Sub sequent restoration of large motor loads.
Description : What are the sequences of motor load restoration in EMTR?
Last Answer : 1. AHPPW -1001 - 4 Sec. 2. APWC - 1003 - 8 Sec. 3. APWC - 1004 - 12 Sec. 4. AHPPW -1002 - 16 Sec. 5. PPP - 1001 - 20 Sec. 6. MOD - 1002 - 24 Sec. 7. MOD - 1001 - 28 Sec. 8. Air Comp - ... 1006 - 36 Sec. 10. 7343 Exst Fan 1003 - 40 Sec. 11. ECCS PM 1001 - 44 Sec. 12. ECCS PM 1002 - 48 Sec.
Description : What are the routes of EMTR?
Last Answer : CL-III bus under voltage. The DG’s will start. All the breakers connected to the affected bus will trip. DG breaker will close on dead bus. Loads will be restored one by one. CL-II bus under voltage. The tie breaker of the affected bus will close.
Description : How EMTR is initiated?
Last Answer : EMTR is initiated on sensing the CL-III & CL-II bus under voltage.
Description : What is meant by EMTR?
Last Answer : In case of normal supply failure to CL-III & CL-II the loads will be fed by the alternative/standby sources. This changeover of supply is called Emergency Transfer.
Description : What refers generally to any type of fraud or scheme that uses one or more components of the Internet?
Last Answer : The generic term is 'cybercrime'.
Description : The ______ scheme uses three levels (+V, 0, and-V) andthree transition rules to move betweenthe levels. A) 4B5B B) 2B1Q C) MLT-3 D) none of the above
Last Answer : MLT-3
Description : For distribution network which type of Switching scheme is employed?
Last Answer : For distribution network Ring Main busbar scheme is employed. It has the provision that if power interruption occurs to one bus section due to maintenance or fault, power can be fed the bus from other side of the power system.
Description : Give two basic speed control scheme of DC shunt motor?
Last Answer : Answer: 1. By using flux control method: in this method a rheostat is connected across the field wdg to control the field current. So by changing the current the flux produced by the field wdg can ... ) can be varied, and since speed is directly proportional to Eb-IaRa the speed can be controlled.
Description : What parameters or technical particulars are important to be considered while designing protection scheme of the transformer?
Last Answer : 1.Network Diagram showing the position of the transformer in the system 2.kVA or MVA rating of the transformer 3.Fault Level at the transformer 4.Voltage Ratio 5.Winding Connections 6.Per Unit ... Oil Filled 11.Length and area of cross section of the connecting leads between CTs and Relay Panel
Description : Mention any two disadvantage of carrier current scheme for transmission line only.
Last Answer : The program time (ie, the time taken by the carrier to reach the other end-upto .1% mile); the response time of band pass filter; capacitance phase-shift of the transmission line .
Description : Mention the short comings of Merz Price scheme of protection applied to a power transformer.
Last Answer : In a power transformer, currents in the primary and secondary are to be compared. As these two currents are usually different, the use of identical transformers will give differential current, and ... turn-ratio are used, the differential current may flow through the relay under normal condition.
Description : What are the settings provided in synchronizing scheme (SKE Relay)?
Last Answer : Voltage – V1- V2 = 10% Frequency – t = 0.05 Sec (2.5 Hz) % Slip – 0.45 Phase angle difference - 20°.
Description : Why synchronizing scheme has been adopted? What are interlocks provided?
Last Answer : To check running and incoming buses, which are going to be interconnected are in synchronism with each other. Interlocks 1. Synch selector. 2. Only one breaker can operate at a time. 3. ... will bypass this synch contact). Bypass facility is provided to close the breaker on dead bus only.
Description : What are the conditions for Auto transfer scheme?
Last Answer : Backup protections are not allowed to initiate the Auto transfer. Because under voltage may exist in the bus. Similarly protection in LV of the transformers are not initiating the Auto transfer scheme. There are three metrics used ... in GT. 4. Fault in 220 kV bus (SUT). 5. Fault in SUT (86M).
Description : What are the types Auto transfer scheme?
Last Answer : 1. Fast transfer scheme to close the tie-breaker in less than 200 milli seconds. This limits transient current and voltage dip in the bus and does quick acceleration of the motors. 2. Slow transfer after 200 milli seconds.
Description : Why stabilising resistor in REF or residual E/F scheme?
Last Answer : Required against CT saturation under heavy through fault currents.