OWER QUALITY METER EPM9650 – P
General Electric Company products have been used as the basis for design. Other manufactures’ products of equivalent quality and operating features may be acceptable, at the engineer’s discretion, if they comply with
all requirements specified or indicated in these Contract documents.
2.2 Power Meters
A. Power meter shall be multi-function 3 phase solid state unit with ability to connect to either 3
phase, 4 wire or 3 phase, 3 wire delta circuits.
B. Voltage and current inputs to the meter shall conform to the following at a minimum:
1. Monitor shall accept input of four (4) independent voltage inputs and four (4)
independent current inputs of the stated capacity.
2. Voltage input shall be 120 volts AC with available option for direct connection to voltage
circuits of up to 600 VAC without the use of potential transformers.
3. Voltage input shall be optically isolated to 2500 volts DC. Shall meet or exceed IEEE
37.90.1 (Surge Withstand Capability)
4. Current input shall be rated for 5 amps with a continuous input capability of 10 amps.
5. Current inputs shall be solid U-Bolt stud inputs with a 10 second over-current rating of
100 amps and a 1-second over-current rating of 300 amps.
C. Power meter shall measure and report the following quantities at a minimum:
1. Voltage, both phase to neutral and phase to phase, for all three phases; Auxiliary voltage;
Phase angles for each voltage relative to each other. One cycle, 100 millisecond and one-
second readings shall be available simultaneously.
2. Current, phase A, B, C, N-measured, and N-calculated; Phase angles for each current
relative to voltages. One cycle, 100 millisecond and one-second readings shall be
3. Watts (total and per phase), VARs (total and per phase), VA (total and per phase), Power
Factor (total and per phase) and Frequency. 100 millisecond and one second readings
shall be available simultaneously.
4. Accumulated Watt-hr, VA-hr, and VAR-hr; Watt-hr received; Watt-hr delivered. VAR-hr
and VA-hr reading shall be stored in each of the 4 quadrants of energy.
5. Power demand shall be calculated using four (4) different averaging methods: Thermal
Average, Fixed Window Average, Sliding Window Average, and Predicted Average.
Values for all averaging intervals must be available simultaneously.
6. Power meter shall provide updates of all voltage and current readings at intervals of 1
cycle, 100 milliseconds, and 1 second. Readings shall be available for both metering and
control. All specified readings shall be made available via the RS-485 ports.
7. Power meter shall provide time-stamped maximum and minimum readings for every
8. Power meter shall provide coincident VAR readings for all maximum Watt readings. D. Power meter shall provide the following accuracies:
1. Voltage accuracy shall be within less than 0.01% for the 1-second readings and less than
0.1% for the 100- millisecond readings.
2. Current accuracy shall be within less than 0.025% for the 1-second readings and less than
0.1% for the 100-millisecond readings.
3. Power and energy accuracy shall be within less than 0.04% at unity PF and within 0.06%
at 0.50 PF.
4. Frequency accuracy shall be within less than 0.001 Hz.
5. Power meter shall meet ANSI C12.20 and IEC 687 accuracy requirements. E. Power meter shall provide multiple digital communication ports and support multiple open
1. Meter shall include four (4) independent, digital communication ports. Each port shall be
RS-485 architecture. Port 1 shall be user selectable as either RS-232 or RS-485
2. Each port shall be user configurable with regard to speed, protocol, address, and other
communications parameters. All ports shall support a maximum communication speed of
115k baud simultaneously.
3. One communication port shall be configurable as either a Master or a Slave port. The
Master configuration shall enable the unit to act as an RTU and interface with other
Modbus devices and EI I/O Modules communicating using Modbus RTU protocol.
4. Meter shall have an Ethernet port as an available option.
5. Meter shall have a 56K internal modem as an available option.
6. Meter shall offer both Modbus and DNP 3.0 open protocols as standard configurations.
All instantaneous data, logged data, event data, power quality analysis and waveform
information shall be available using these open protocols.
F. Meter shall include an integrated Ethernet network connection (INP100 option).
1. Connection shall support network access at 10/100 Mb.
2. 10/100 Base T design (INP100) shall support up to 12 simultaneous Modbus/TCP socket
connections allowing simultaneous access by up to 12 users.
3. Onboard Modbus data concentrator shall poll up to 8 devices or 512 unique polling items
from any device that can speak Modbus RTU and/or Modbus TCP protocols.
4. Connection shall allow up to 9 users to receive alarm emails on events.
5. Meter shall gather data from itself and 8 Modbus TCP devices and put directly into an
XML user programmable format and allow users to link to meter and view data through a
direct connection by a LAN, WAN, Internet or Intranet.
6. The meter shall allow programming custom pages stored locally and on a remote FTP site. G. Power meter shall provide sequence of events capture and recording.
1. Meter shall have at least eight high-speed status inputs for capturing external events with
one millisecond resolution
2. All high-speed status inputs shall be monitored at a user set rate from 1 to 8 samples per
3. All changes in status shall be time stamped to the nearest millisecond and placed in an
event log with time and event label information.
4. Event log shall enable users to recreate sequence of events involving external status
5. High-speed status inputs shall be able to trigger waveform recording to the waveform log.
6. Status inputs shall be configurable for event monitoring, pulse accumulation, or pulse
H. Power meter shall provide a separate IRIG-B input for time synchronizing to GPS time signal.
1. IRIG-B input shall accept un-modulated time signal input from a standard GPS satellite
2. Time input shall enable time synchronizing to one millisecond and shall not be subject to
network or other delays.
I. Power meter shall provide external display(s) to accommodate access to readings locally and/or
remotely. Display(s) shall be LCD Touch-Screen and/or LED Display.
1. LED Display shall be three line, LED format. LEDs shall be 0.56-inch size. Display shall
include 10-character alphanumeric segment to provide legend and scaling information for
2. LCD Display shall be a touch-screen liquid crystal display. This display shall be 320 x
240 Pixels, blue on white-CCFL Backlight (cold-cathode florescent) to provide superior
reliability in all light conditions.
a. The level of backlighting and contrast shall be adjustable.
b. The system display shall be equiped with an energy saver feature to extend the life of
c. The LCD display shall display:
i. Time of Use Readings
ii. Real-Time Readings
iii. Phasor Diagrams
thiv. Harmonic Spectrum (to the 127 order)
v. Real-Time Waveforms (all channels)
d. The LCD display shall be capable of interfacing with up to 8 EPM 9000 Series
power meters by addressing functions.
3. Display(s) shall connect to Power Meter via RS-485 communications architecture. The
communication channel shall be isolated at the display to avoid the introduction of noise.
4. Display(s) shall be able to be powered directly from Power Meter or from an auxiliary
5. Display(s) shall communicate with Power Meter using Modbus protocol.
6. Display(s) must be capable of operating over common communications channels. It shall
be capable of being connected up to 4000 feet from the Power Meter.
7. Display(s) shall be surface mounted for ease of installation.
8. Power meter shall be capable of supporting multiple displays.
J. Power meter shall be equipped with non-volatile RAM for recording logs and programming
1. Memory options of 2MB and 4MB shall be available.
2. Meter shall store historical trending data, power quality data, and waveform recordings in
2. In the event of loss of control power, data stored in memory shall be retained for at least
3. Memory shall be allocated to the various logging functions required. All logging features
required shall be simultaneously available at the specified levels. Exercising any one
feature at the specified level shall not limit exercising of any or all other features to their
full, specified level.
4. Meter shall store all programming and set-up parameters in non-volatile memory. In the
event of loss of control power, meter-programming data stored in memory shall be
retained for at least 10 years.
K. When supplied with appropriate memory option, power meter shall provide historical data logging
for trending of measured values.
1. Power meter shall contain two independent data logs.
2. Each historical log shall be user configurable. User may select measured quantities and
reading intervals for each log.
3. Each historical log shall record at least 170 days of data where 5 readings are being
stored every 15 minutes.
4. One of the historical logs shall be configurable for time of use recording. L. The monitor shall internally record and store Time of Use.
1. The following Time of Use parameters must be included:
a. Twenty year calendar
b. Four seasons
c. Twelve Holidays per season
d. Four TOU schedules per season
2. The meter must display the following information in real-time when the TOU is enabled:
a. Current month accumulations
b. Previous month accumulations
c. Current season accumulations
d. Previous season accumulations
e. Total accumulations to date
3. Full four quadrant accumulations for Watt-hr, VAR-hr, VA-hr and coincident VARs
during peak watt demand including max demand, shall be available for each tariff
schedule, each season and for total accumulations.
M. When supplied with appropriate memory option, power meter shall provide extensive power
quality monitoring capability.
1. Power meter shall measure and record the magnitude and phase angle of all harmonics ththrough the 127 for all voltages and currents. Meter shall provide %THD and K-Factor
for all channels.
2. All harmonic values shall be available through the digital communications ports in real
3. Power meter shall capture and record all CBEMA quality events.
4. CBEMA events shall be date/time stamped to the millisecond. Entries to CBEMA log
shall include date/time stamp, duration, and magnitude information. The CBEMA log
shall be downloadable through the digital communications ports.
5. The CBEMA log shall hold over 1024 events in a revolving FIFO format.
6. Power meter shall capture and record out-of-limit conditions in a log. Entries to Limits
log shall be made anytime a monitored quantity exceeds the user set limit assigned to that
7. Entries to the Limits log shall be time stamped to the millisecond and include the
measured quantity value and label.
8. The Limits log shall hold over 1024 events in a revolving FIFO format.
N. When supplied with appropriate memory options, power meter shall provide waveform recording
to capture and record transients and quality problems on current and voltage waveforms.
1. Meter shall sample waveform at a user configurable rate of 16 to 512 samples per cycle
2. Meter shall hold at least 96 records of waveform recording in non-volatile memory. Each
record shall be a minimum of 8 cycles in duration at the highest sample rate or 64 cycles
in duration at the lowest sample rate at not less than 16 bit resolution.
3. Each waveform record shall include pre-event and post-event data.
4. Waveforms shall be recorded with time resolution to within one (1) millisecond.
5. A waveform record shall be taken whenever the RMS value of voltage or current exceeds
6. User shall be able to configure meter so that a waveform record shall be taken whenever
a status change occurs on any one of the eight high-speed status inputs. O. Power meter shall have expandable auxiliary I/O capability. This capability shall allow the power
meter to operate as an RTU for control and data acquisition.
1. Meter shall allow connection of external I/O modules.
2. Up to four (4) 8 channel external I/O modules shall be capable of being powered directly
from the power meter. An auxiliary power supply shall be available to power additional
I/O modules if needed.
3. External I/O modules shall be isolated from the power meter and from each other.
4. I/O modules shall connect to the power meter using RS-485 communication architecture
and shall be capable of being placed up to 4000 feet from the power meter.
5. External I/O modules shall communicate with the power meter using Modbus protocol.
Closed protocols shall not be accepted.
6. External output modules shall have four to eight channels each and shall allow the use of
0-1 mA outputs, 4-20 mA outputs, digital pulse outputs, and control relay outputs.
7. External input modules shall have four to eight channels and shall allow use of 0-1 mA
inputs, 4-20 mA inputs, 0-5 VDC inputs, 0-10 VDC inputs, digital status detect inputs for
status or pulse accumulation, and RTD inputs for temperature measurement.
8. External I/O modules shall be able to be added to the meter after installation to provide
upgrade capability after the initial installation is complete. Changing the power meter
shall not be required to provide this upgrade capability.
9. Meter shall record, data trend, and make available through communication ports all
information from the external I/O modules.
P. Power meter shall be programmable by software supplied by the meter manufacturer.
1. Software shall have a user-friendly, Windows compatible interface.
2. Software shall operate on Software shall operate on Windows 2000 and Windows XP
3. Software shall include capacity to program meter, download meter, and analyze
downloaded data files.
4. Software shall store all data in an ODBC compliant database. Data based storage shall
include all log and waveform data.
Q. Power meter shall be appropriately constructed to provide long life in abusive physical and
1. Meter shall be housed in an all-metal enclosure with no visible openings and no exposed
oo 2. Meter shall operate successfully at temperature extremes from –40 C to +70 C.
3. Meter shall be UL listed.
4. Meter shall operate with control power from 90 to 275 volts AC/DC. Meter shall have a
power supply option to operate with control power of 18 to 60 VDC.
Q. Power meter shall be General Electric / model: EPM 9650 with 4 Meg Memory.