Presentation on theme: "Availability Based Tariff Meter"— Presentation transcript:
1 Availability Based Tariff Meter ER300PLARSEN & TOUBRO LIMITED
2 Features of ABT MeterThe Meter measures Active/Reactive energy on 3 phase, 4 wire principle,Computes the active energy import /export from the substation bus bars during each successive 15 minutes block and stores it in its Memory.Integrates the reactive energy algebraically into two separate registers,A) One for the period for which the average RMSvoltage is 103% or higher (High VARh),B) The other for the period for which the averageRMS voltage is below 97.0% or lower (LowVARH).
3 Features of ABT MeterAverage frequency for each successive 15-min block, as a 2-digit codeOriginal Frequency = *2-digit code.Net Wh transmitted during each successive 15-minute block, upto second decimal, with plus/minus signCumulative Wh transmitted at each midnight, in six digits including one decimalCumulative VARh transmitted for voltage high condition, at each midnight in six digits including one decimal
4 Features of ABT MeterCumulative VARh transmittal for voltage low condition, at each midnight, in six digits including one decimalDate and time blocks of failure of VT supply on any phase, as a star (*) markThe meters shall store all the listed data in their memories for a period of ten daysBattery back-up for data viewing display.
5 Basic Technical Specifications . Accuracy Class : 0.2INTERFACE : WITH RS485Reference Voltage(Vref) : 110V.(P-P)Rated Current ( Ib) : 5A or 1A.Operating Voltage :+20% to -30% of Vref.Operating Current : 0.2% to 200% of Ib
6 Display List ii) Date (year month day) :081112 d i) Meter Serial No :NP5001Aii) Date (year month day) : diii) Time ( hour min. sec. ) : tiv) Cumulative Wh reading : Cv) Average frequency of the last block :49.89 Fvi) Net Wh transmitted in last block :28.75 Evii) Average % voltage :99.2 Uviii) Reactive power (VAR) :106.5 rix) Voltage - high VARh register reading : Hx) Voltage - low VARh register reading : Lxi) Low battery indication
8 DCD Main Window (D) COLL. SELECTED DATA (U) PC COMMUNICATION (P) PROGRAMMING MODE(O) MEMORY STATUS CHECK(R) ACCURACY
9 Data Collecting Device Press (D) for Collecting of Meter DadaPress (U) for damping the data from DCD to PC3. Press (P) for enter into Programming Mode i.e only for time adjustment for 1 minute4. Press (O) for Memory status check
10 Time adjustment through DCD After connecting the Optical Port to the meter and DCD following step to be done for Time adjustment.1. Press “P” in DCD to enter in Programming mode.2. Enter the Password: XMISSION
11 Time adjustment through DCD 3. Press Enter after typing the “XMISSION” in DCD 4. Following Manu will come after pressing enter in DCD : (A) Advance (R) Retard (X) back to Manu
12 Time adjustment through DCD 5. i) Press “A” if the meter time is slowii) Press “R” if the meter time is fastN.B :Program/ time adjustment (only for 1 minute) can be done one in a week.ii) Time taken to adjustment one min hrs. 30 min i.e. 6 Blocksiii) Time adjustment can be done only on power On conditions
13 Do’s & Don'ts with DCD Don’t keep the DCD in Suspended mode To save the battery life switch off the DCD properlyDCD battery should be charged at least twice in a weekCharging time is 3 hours
14 RS485 Network Serial Port, Local Area Communication Two-wire, multidroppingUncomplicated hardwareNo distance limitation within a premises
15 Hardware RequiredWe have used IEC 1107 protocol for RS 485 communication.Recommended hardware is mentioned below :1. Twisted pair with foil shielding and a drain wireMake : Belden ( Product Code 9841/8162/9501) cost Rs. 49,000 per305m or equivalent local cable cost Rs. 2,000 per 100m.Characteristic Impedance : 120 OhmsTwist/Feet : 102. RS 485 to RS 232 ConverterMake : MoxaModel No : Transio A533. PSTN Modem : Used for data transfer on PSTN Line from S/S to LDCMake : Multitech KbpsModel No : MT2834ZDXB
16 The SystemMeterRS232D+Collection PointRS232 to RS485 ConverterD-