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Digital Input Power Meter. Darrin Marr Marcie Webb Brad Zarikoff. Background Design and operation Progress and problems encountered. Introduction. To design a Power Meter that accepts a digital input. Project Goals. Reduce the redundancy in conventional technology.

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darrin marr marcie webb brad zarikoff

Digital Input Power Meter

Darrin Marr

Marcie Webb

Brad Zarikoff

introduction
Background

Design and operation

Progress and problems encountered

Introduction
project goals
To design a Power Meter that accepts a digital inputProject Goals
  • Reduce the redundancy in conventional technology
  • Improve on Power Measurement for Utility Industry
application overview
Power Meters are typically used in substations

Current and voltage transducers feed power meters

You cannot connect an oscilloscope to 138 000 volts

Application Overview
conventional technology
Conventional Technology

IPP tap from utility breakers

(Analogue Metering)

Optical Current Electronics

DAC, Amplifier

Current Sensor

Voltage Sensor

Optical Voltage Electronics

DAC, Amplifier

NXVCT

120V analogue signal

Analogue Meter

- 0.2% accuracy over 2 – 3000A range

Utility owned equipment

IPP owned equipment

138 kV

13.8 kV

Gas Turbine Generators

225 MVA

13.8 kV, 60 Hz

Stn. Service Xfmr.

475 kW load

metering with digital input
Metering with Digital Input

IPP tap from utility breakers

(Digital Metering)

Optical Current Electronics

Current Sensor

Merging Unit

Voltage Sensor

Optical Voltage Electronics

NXVCT

Meter with digital input

Utility owned equipment

IPP owned equipment

138 kV

13.8 kV

Gas Turbine Generators

225 MVA

13.8 kV, 60 Hz

Stn. Service Xfmr.

475 kW load

corporate sponsorship
NxtPhase is a company that makes Voltage and Current Transducers

NxtPhase uses optics to measure the line voltage or current

Optical signal is transduced to voltage and digitized

Dedicated to “Digitizing the Grid”

Corporate Sponsorship
keeping nxtphase happy
NxtPhase does not make Power Meters

Want to interface to next generation Digital Input Power Meters and Protection Relays

Need to develop a Merging Unit to IEC 60044-8 standard

Keeping NxtPhase Happy
digital input power meter
Current and voltage emulation

Current and voltage data merging unit

Receiving and data decoding unit

Data display

Digital Input Power Meter
sine wave generator
Used to generate three-phase voltage and current received from NxtPhase equipment

Simulates three voltage and current signals

Output at NxtPhase proprietary data and sampling rate as TDM signal

Sine Wave Generator
merging unit
Takes TDM data of six sinusoids and packetizes them into data stream for transmission

Outputs packets at 2.5Mbps at 4.8kHz sampling rate

Continuous packet output (no idle)

Averages samples (NxtPhase sampling rate much faster than IEC standard)

Merging Unit
packet standard
Packetized in accordance with IEC 60044-8 standard

Packet standard incorporates three-phase metering, protection, and unit data, error control (CRC)

Packet Standard
buffer board
Transmission along data line to allow for remote monitoring

Buffer board decodes data packet and buffers data (0.2s worth) for burst transmission

National Instrument DAQ card dumps data into file on PC to be used by meter display

Buffer Board
data display
Visual Basic in Excel application

Retrieves voltage and current data from data file every x seconds

Formats and displays current and voltage information

Calculates voltage and current spectrum, power factor, and RMS values

Data Display
project status
Verification stage at present

All design and implementation complete

Currently testing to ensure reliable operation

Visit our demo on Friday in ELW

Project Status
problems encountered
No copy of Matlab for meter display development

Would have been excellent tool for data display and manipulation

Now using Visual Basic in Excel

Limited mathematical capabilities

Slow graphing capabilities

Problems Encountered
problems encountered1
Original design included fiber optic link between Merging Unit and Digital Meter

Researched options available

Found inexpensive development kit

Lack of time forced us to abandon testing and implementation

Fiber optics used to avoid EMI

Problems Encountered
error detection
IEC 60044-8 standard includes CRC error detection code

Uses three 16-bit CRC checks

Possible to have better error detection with less CRC bits required

One 32-bit CRC check would have better detection capabilities

Error Detection
conclusions
Digital input power meter currently not available commercially

NxtPhase has interest because need to connect PT’s to digital meters

Realizable with more time

NxtPhase will be able to use Merging Unit design as step towards useable product

Conclusions
ad