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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 input

Project 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 Transducers

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 Transducers

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 data stream for transmission

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

Packet Standard


Merging unit1
Merging Unit data stream for transmission


Buffer board

Transmission along data line to allow for remote monitoring data stream for transmission

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 data stream for transmission

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


Digital interface meter
Digital Interface Meter data stream for transmission


Project status

Verification stage at present data stream for transmission

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 data stream for transmission

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 Unit and Digital Meter

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


Questions? commercially


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