Technical specifications for three phase meters
- 1. TECHNICAL SPECIFICATIONS FOR THREE PHASE ENERGY METER
- 2. Technical Specifications for Three Phase Energy Meter The equipment covered by these broad specifications shall conform to the requirements stated in latest editions of relevant Indian/ IEC Standards and Regulations. 2.0 STANDARDS APPLICABLE: Unless specified elsewhere in this specification, the performance & testing of the meters should conform to the following Indian/International standards, to be read with up to date and latest amendments/revisions along with additional requirements at Annexure-I. S. No. Reference Detail Reference Title 1 IS 13779 (1999) A.C. Static Watt hour meter class 1.0 and 2.0 2 CEA Regulation (2006) Installation and operation of meters Dtd: 17/03/2006 3 CBIP – TR No. 325 Guide on A.C.Static Electrical Energy Meters - Specification (latest amendment). 4 IS 9000 Basic Environmental testing procedure for electrical and electronic items. 5 IS 12346 (1999) Specification for testing equipment for A.C.Electrical energy meter. 6 IS11000 (1984 Fire hazard testing 7 IEC 62052-11 (2003) Electricity Requirements (AC) General Requirements Tests and Test conditions for A.C.Static Watt hour meter for active energy Class 1.0 and 2.0. 8 IEC 62053-21 (2003) A.C.Static Watt hour meter for active energy Class 1.0 and 2.0 9 IS 15707 (2006) Testing Evaluation installation and maintenance of AC Electricity Meters- Code of practice. 10 IEC 60068 Environmental testing 2.0 GENERAL TECHNICAL REQUIREMENTS: Sl. No. Particulars Standard Specification 1 Type of the meter Three phase four wire, whole current meter , direct reading type 2 Accuracy Class 1.0 3 Basic Current (Ib) & rated max. current (Imax) Ib =20 Amp, Imax= 100 Amp 4 Operating Voltage Voltage +20 % to -40 % of Vref. However the meter should withstand the maximum system voltage 5 Operating Frequency F= 50 Hz ± 5 %
- 3. 6 Power consumption per phase As per IS 7 Starting Current 0.2 % of Ib 8 Short time over current 3000 A for 0.01 sec 9 Influence of heating External surface of the meter shall not exceed 20 K at 45° C ambient temperature 10 Rated impulse withstand voltage 8 KV 11 AC withstand voltage for 1 minute 4 KV 12 Insulation resistance a Between Frame & voltage & current Circuit 5 M Ohm b Between each current Circuit & other circuit 50 M Ohm 13 Mechanical requirement As per Clause of 12.3 of IS 13779 14 Resistance to heat & fire Shall not be ignited by thermal overload & material shall be fire retardant 15 Protection against penetration of dust & water Degree of protection IP: 51 as per IS 12063 w/o suction in meter 16 Resistance against climatic influence Clause 12.6 of IS: 13779 17 Electromagnetic compatibility Requirement shall be as per CBIP technical report no. 325 18 Power factor range Zero Lag - Unity- zero Lead 19 Energy measurement Fundamental energy + Energy due to harmonics 20 Test Output Device Flashing LED visible from the front 21 Billing Data a) Meter serial number, Date and time, KWh, KVAh, Power factor, MD in KW & KVA, History of KWh, KVAh & MD of both for last 6 months along with TOD readings. KVAh is computed based on KVARh and KWh. If Power factor is 1 or leading then, KVAh shall be treated equal to KWH b) All these data shall be accessible for reading, recording, and spot billing by downloading through optical port on CMRI or Laptop computers at site.
- 4. 22 MD registration a) Meter shall store MD in every 30 minutes period along with date & time. At the end of every 30 minutes new MD shall be previous MD and store whichever is higher and the same shall be displayed. (b) it should be possible to reset MD automatically on the defined date. 23 Auto reset of MD The MD resetting shall be automatic at the 1st of the month i.e. 0000 hours of 1st of the month. Manual MD reset button shall not be available. Provision shall be made to change MD reset date through MRI even after installation of meter on site. 24 TOD metering Meter shall be capable doing TOD metering for KWH, KVAH & MD in KW & KVA with 6 time zones wherever applicable. It shall be possible to reconfigure the meters for TOD Tariff, billing date, RTC etc. through proper authentication process via communication port. 25 Climatic condition The meter should function satisfactorily with temperature ranging from 0-600 C and humidity upto 95% 26 Calibration Meter shall be calibrated at factory and modification in calibration shall not be possible at site by any means. Certified by manufacture 27 Meter Sealing As per IS 13779 & CEA metering regulation 2006 28 Memory Non-volatile memory independent of battery backup, memory should be retained upto 10 year in case of power failure. 29 Battery In case battery removal or total discharge same should not affect the working & memory of the meter 30 Load Survey 60 Days Load Survey for KW, KVA, Voltage, Current of each phase, with 30 minutes integration period 31 Connection diagram Shall be provided on terminal cover 32 Initial Startup of meter Within 5 sec after ref voltage is applied to the meter terminal 33 (a) internal dia of the terminal hole As per CBIP 33 (b) Depth of the terminal hole 25 mm
- 5. 34 Clearance between adjacent terminal 10 mm 35 Display LCD (6 Digit ), Height 10 mmX6 mm, pin type, viewing angle min 160 degrees 36 Security feature Programmable facility to restrict the access to the information recorded at different security level such as read communication, communication write etc. 37 Software/ Communication Compatibility/ Communication port Optical port with RS 232 compatible to transfer the data locally through CMRI & remote through PSTN / Optical fiber / GSM / CDMA / RF / any other technology to the main computer. The Supplier shall supply Software required for CMRI (Atleast for Analogic & SANDS make) & for the connectivity to AMR modules. The software should be compatible to Microsoft Windows systems. The software should have polling feature with optional selection of parameters to be downloaded for AMR application. The Supplier shall provide meter reading protocols.
- 6. Annexure-I Additional Requirement for Three Phase Whole Current Energy Meter S.No. Feature in addition to BIS Features Requirement 1 Functional Starting current 0.2 % of Ib 2 Measuring Parameters Real time & Date Cumulative kWh Other energy kVAh (Lag), kVArh( lead) & kVArh (lag) Current Maximum demand in kW & KVA Inst V,I & Power Factor Maximum Demand Six month energy history Load Survey Time of Day tariff On/ Off hours 3 Anti Tamper And Anti- Fraud Features Reverse Phase Energy Phase sequence reversal Detection of missing potential Current Coil shorting Welded meter body Tamper History Energy computation during missing potential Power On/Off Abnormal Power Off Snap-on parameters Protection against HV spark/ ESD Low voltage event Low Power factor recording Top cover open Write Transactions Neutral Disturbance Only two Phase (One phase and one neutral missing) 4 Additional Features(Optional) Mid night data Temperature Net Metering