CSEB Minor Or Major Project Report - Technical Requirement, Conclusion
Get Our Latest Interview Questions: Aptitude, Reasoning, English, GD, HR-PI TECHNICAL REQUIREMENT:-
o Standard reference voltage (as per relevant IS).
o Voltage range (as per relevant IS)..
o Standard frequency range (as per relevant IS)..
o Standard basic current (as per relevant IS)..
o Accuracy class:- Interface meter – .2S
o Starting current & maximum current(as per relevant IS).
o Power factor range(as per relevant IS)..
o Power frequency withstand voltage(as per relevant IS).
o Impulse withstand peak surge 1.2/50 Micro Sec. (as per relevant IS).
o Power consumption (as per relevant IS).
GENERAL AND CONSTRUCTIONAL REQUIREMENTS:
o Meters shall be designed and constructed in such a way so as to avoid causing any danger during use
and under normal conditions. However the following should be ensured:-
i. Personnel safety against electric shock
ii. Personnel safety against effects of excessive temperature
iii.Protection against spread of fire
iv.Protection against penetration of solid objects, dust and water in normal working condition.
o All the materials and electronic power components used in the manufacture of the meters shall be of highest quality and reputed make to ensure higher reliability, longer life and sustained accuracy.
o The meters shall be designed with application of specific integrated circuits. The electronic components shall be mounted on the printed circuit board using latest Surface Mount Technology (SMT).
o The meters shall have an operation indication device such as a blinking LED. The operation indicator shall be visible from the front window.
SEALING OF THE METER:
Proper sealing arrangement shall be provided on the meter to make it tamper proof and to avoid mishandling by un-authorized person. At least two (2) seals on the body, two (2) seals on the terminals block and one seal each on maximum demand resetting device and communication ports shall be provided. Meter base and cover shall be tightened from rear side with at least two nos. unidirectional screws so that meter body could not be opened at site in any case and two nos. firms stickers seals bearing serial no., which should not be repeated shall be provided between meter base and cover. The meter shall be totally sealed and tamper-proof with no possibility of any adjustment at site, except for a restricted clock correction.
• MARKING OF METER:
The marking on every meter shall be in accordance with IS 14697/IEC 687. The basic marking on the meter name plate shall be as follows:-
o Manufacturer’s name and trade mark.
o Type Designation
o Number of phases and wires
o Serial number
o Month & year of manufacture
o Reference voltage/ PT ratio Frequency.
o Rated secondary current of CT (-/1 or -/5 A).
o Principal unit(s) of measurement.
o Meter constant (impulse/kWh).
o Class index of meter.
o Text “Property of ……………………..”
o P.O. No. & Date.
o Guarantee period
• CONNECTION DIAGRAM & TERMINAL MARKING:
The connection diagram of the metering module shall be clearly shown inside portion of the terminal cover and shall be of permanent nature. The meter terminals shall also be marked and this marking should appear in the above diagram. In case any special precautions need to be taken at the time of testing the meter the same may be indicated alongwith the circuit diagram
• DISPLAY:
o The display shall be L.C.D. type display with Back lit. Minimum height of the characters shall be 6 mm.
o The three line-to-neutral voltages shall be continuously monitored and in case any of these falls below about 70% the condition shall be suitably indicated and recorded. The meter shall operate with the power drawn from the VT secondary circuits, without the need for any auxiliary power supply. Each meter shall have a built in calendar and block, having an accuracy of 6 minutes per year or better.
• TAMPER DETECTION FEATURES:
o There shall be an appropriate display system by which any attempt of tampering the meter is promptly displayed with date and time tagging. The meter shall have features to detect the occurrence and restoration of, at least, the following common /tamper :-
o The meter shall not get damaged or rendered non-functional even if any phase and neutral are interchanged.
o The meter shall register energy even when the return path of the load current is not terminated back at the meter and in such a case the circuit shall be completed through the earth. In case of metallic bodies, the earth terminal shall be brought out and provided on the outside of the case.
o The meter shall work correctly irrespective of the phase sequence of supply (only for poly phase).
o In the case of 3 Phase 4 wire system, the meter shall keep working even in the presence of any two wires i.e. even in the absence of neutral land any one phase or any two phases.
o The registration must occur whether input phase or neutral wires are connected properly or they are interchanged at the input terminals.
• MEMORY:
Each meter shall have a non-volatile memory in which the following shall be automatically stored.
o Active energy import
o Active energy export
o Average frequency for each successive 15-minute block
o Average load (in KW/MW) for each successive 15-minute block for import and export
o Reactive Energy Import (while Active Import/Export)
o Cumulative VArh transmittal for voltage high condition, at each midnight, in six digits including one decimal.
o Cumulative VArh transmittal for voltage low condition, at each midnight, in six digits including one decimal.
CONCLUSION:-
I am very grateful to management of college and C.S.E.B for their cooperation to give me this wonderful opportunity to gain knowledge and exposure with industry.
I was really astonished to get such type of industrial exposure in such a reputed firm i.e. C.S.E.B.