Model 9000 DME system

the flagship DME System

The Model 9000 DME System is a high performance multifunction data collection and analysis system that exceeds PRC-002-2 and PRC-018-1 requirements. The Model 9000 is suitable for generation, transmission, and distribution applications. All Model 9000 DME Systems include a Sequence of Event Recorder (SER), Digital Fault Recorder (DFR), Dynamic Disturbance Recorder (DDR), and Continuous Oscillography Recorder in one box. The Model 9000 also has an optional software update that gives users the ability to enable the Phasor Measurement Unit (PMU) feature which provides streaming data in conformance with IEEE C37.118. All data recorded by the DME system is stored in IEEE C37.111 format and named in conformance with IEEE C37.232.

Computer, Software, and web-based graphic user interface

Each Model 9000 System includes one DME Station Master, which is an industrial grade, fanless computer. The M9000’s Station Master runs a Linux operating system which allows for easy expandability to meet all customer-specific requirements, needs, and commissioned projects. The M9000 Station Master houses the M9000 Master software package which runs both the DME as well as pushes data to the Web-Master. This unique software design allows end users multiple options on how to store the data. Like most DME systems on the market, the software is loaded on the DME Station master so fault analysis and file extractions can be performed on-site (e.g., inside a substation). 

However, unlike all other DME manufacturers on the market, USI’s M9000 Master server software is innately web-based in design, allowing for data to not only be stored locally on the standard 1TB drive (which can easily be upgraded to a larger size) but also stored off-site in a server to provide for a secondary fail-safe. Each Model 9000 user can remotely access this data, extract files, and perform post-fault analysis inside the user-friendly web-based interface, all in real-time, while simultaneously enjoying the comforts of their office and never having to go out into the field. All of this is accomplished by the Model 9000’s Linux-based operating system that offers customers the most cyber-secure DME in the entire industry while meeting NERC-CIP requirements. Additionally, USI’s M9000 Master software can be accessed on Windows, Linux, and Mac-based systems for ultimate convenience and compatibility.

system architecture and modular design

The Model 9000 is uniquely architected with a modular design to be highly flexible and to accommodate various installation challenges. Each Model 9000 system comes standard with a M9000 Station Master (see above paragraph for details), a M9000 Power Supply which provides power to the unit and provides for the alarm outputs, and (at least one) Data Acquisition Unit (DAU). Each DAU has four (4) board slots that can each be customized and outfitted with either an 8 Analog or 32 Digital board. The Model 9000 is unrestricted in the number of DAU modules and input channels it can be expanded to making the size and input configurations theoretically limitless. This versatility is one of the many features which put the Model 9000 in a class of its own. Additionally, to ensure seamless communication between each module, the M9000 Station Master boasts an Intel i7 Core Processor with 16GB of RAM and provides each customer with either the standard Ethernet connectivity or an extremely inexpensive, yet fast and robust, upgrade to Fiber. The communication options and features to the DME Station Master allows the customer several convenient and customizable options when designing their own Model 9000 system, including configurations such as a standard centralized cabinet, a system distributed throughout relay panels inside a control house, one that is distributed throughout various control houses within a substation, or even a single Model 9000 DME System that is distributed between several substations, with all DAUs communicating to a single M9000 Station Master (customers are recommended to use Fiber for this option). With the Model 9000, the convenient set-up options are virtually endless.

Model 9000 Applications

The Digital Fault Recorder (DFR) application of the Model 9000 provides users with the ability to analyze system protection operations and circuit breaker performance. USI DRFs record instantaneous values (waveforms) of current and voltages, which are sampled at many times per cycle, for time periods on the order of a second. Users may also record computed quantities with the DFR function.


“The Model 9000’s DFR application’s functions include recording power system events (voltage & current magnitudes), capturing the exact time at which a fault occurred, power swings, and abnormal instrument transformer behavior, such as CT saturation, DC offset (inductance of the system), and CCVT response. Additionally the M9000’s DFR monitors the protection systems’ performance and checks the power system for failures of a relay to operate as intended (retro fit, trip test switch open, etc.), incorrect tripping of terminals for external faults, determining the optimum line reclose delay, and failure of fault interrupting devices.

Digital Fault Recorder (DFR)
Sample Frquencies2400, 3840, 4800, 6000, 9600, 12000, 19200, or 24000Hz
Prefault100-9999 milliseconds
Postfault100-9999 milliseconds
Fault Limit100-9999 milliseconds
Maximum Record LengthCapable of recording consecutive 10 second recordings
continuously at up to 24kHz Sample Frequency
Trigger FilterDebounce and Chatter
Data FormatCOMTRADE (IEEE-C37-111)
Data File Naming ConventionCOMTRADE (IEEE-C37-232)

The DDR function of the Model 9000 allows users to analyze complex power systems events and records the dynamic response of power systems to disturbances that have occurred within the same system. DDRs are extremely useful for disturbance analysis, investigating system oscillations, quantifying sudden changes in power system parameters, and obtaining data for verifying stability models. The DDR is normally used by utilities for low-speed disturbance recording and to capture records that are typically from 1 minute to 1 hour in length. The USI™ DDR function recorders frequency, phase angle, and RMS values of a power systems’ quantities. These quantities include voltage magnitude, current, MW, and MVAR, sampled and calculated at a rapid rate (i.e., 6 to 60 samples or more) per second. Recording duration is generally on the order of a minute or more.

Dynamic Disturbance Recorder (DDR)
Sample Frquencies240, 300, 480, 600, 960, 1200, or 2400Hz
Prefault10-990 Seconds
Postfault10-990 Seconds
Fault Limit10-990 Seconds
Maximum Record LengthCapable of recording five (5) consecutive minute records
continuously at up to 2400Hz Sample Frequency
Trigger SensorsRMS, Frequency, Harmonic, THD, Sequence (+/-/0), Watts, VAR
-Over, Under, or Either
-Rate of Change
Data FormatCOMTRADE (IEEE-C37-111)
Data File Naming ConventionCOMTRADE (IEEE-C37-232)

The Model 9000 Sequence of Events Recorder (SER) application monitors external inputs and record status changes that occur in in a power system. In order to accomplish this function, the SER samples and time stamps operational data in the chronological sequence in which the events take place. This operational data is monitored from substation equipment (i.e., relays, circuit breakers, etc.) and control schemes (automatic and manual) as they react to an event that takes place within the power systems the SER is monitoring. When collected, this data, which can be caused by several different individual events such as a switching operation, mis-operation, or fault, allows the chain of events to be analyzed and studied when searching for the cause of an event that took place within the power system, as well as the linkages between individual actions and effects. The SER can be ordered witihn the trandional, all-included Model 9000 DME Unit, or can also be ordered in a stand-alone, SER-only M9000 Unit for User who only need an SER function. Please contact USI from more details on this possible system configuration.

Sequence of Events Recorder (SER)
Sample Frequencies2400, 3840, 4800, 6000, 9600, 12000, 19200, or 24000Hz
Trigger FilterDebounce and Chatter
Data FormatPortable Document Format (PDF) or Comma Separated Values (CSV)

The Model 9000’s Phasor Measurement Unit optional application can be deployed to monitor the a certain portion of a power system by recording phasor quantities and accurately referencing them to a standard time signal. To accomplish this task, the M9000’s PMU application extracts the parameters magnitude, phase angle, frequency, and rate of change of frequency from the signals appearing at its input terminals. Additionally, the PMU application allows M9000 Users to perform phasor measurement unit functions in addition to existing DME functions simultanously. This add-on package requires no additional hardware or modification to an existing Model 9000 DME System installation. The PMU application features synchrophasors available for each analog channel, positive sequence phasor calculated from any three-phase voltage or current inputs, analog values and digital input statues that can be added to the data stream, and user defined frame rate (60Hz, 30Hz, 20Hz, 15Hz, 10Hz), all while conforming to the IEEE PC37.118 standard. Additionally, the USI PhasorView™ software (see in accessories page), which allows real time monitoring of Synchrophaor data transmitted via the PC37.118 standard, comes with the USI PMU application at no additional cost.

Phasor Measurement Unit (PMU)
ComplianceIEEE C37.118
PhasorsAnalog (Discreet Phasor for All DFR Inputs- up to 128A)
Positive Sequence Phasor for any 3-Phase Voltage or Current
Digital (All DFR Inputs can be included in the Data Stream
SamplingAll Phasor Estimates Calculated from 4.8kHz
Data Frame Rate10Hz, 15Hz, 20Hz, 30Hz, 60Hz
Continuous Oscillography Recorder (CR): Calculated Values
Values RecordedAny Calculated Value (RMS, Phasor, Frequency, Harmonics,
THD, Watts, VAR, Sequence (+/-/0), RPM, etc.)
Maximum Record Frequencies60Hz per channel
Maximum Record Length30 Days (All Channels)
Data FormatCOMTRADE (IEEE-C37-111)
Data File Naming ConventionCOMTRADE (IEEE-C37-232)

Continuous Oscillography Recorder (CR): Sampled Data
Sampled Frequencies240, 300, 480, 600, 960, 1200, or 2400Hz
Maximum Record LengthFive (5) Days (All Channels)

Technical Specifications

Construction: Industrial Grade Fanless Controller

Processor: Intel Corei7

Ethernet: 3-Controllers (10/100/1000MB), 1-Fiber (Optional)


Storage: 128 GB SSD for OS & Software, 1TB HDD for Data (SDD Optional)

Quantity: Multiples of 8 (Unrestricted)

Universal Input Type: AC or DC, Volt or Ampere (Internet Shunt), Transducer, External Shunt, Split/Solid-Core CT

REsolution: 16 bit

Bandwidth: DC to 47kHz

Temperature Drift: 60ppm/C

Linearity: 0.01% of Full Scale Typical

Isolation: 2000Vrms Channel-to-Channel, 2000Vrms Channel-to-Ground

Voltage: 1.5Vrms-400Vrms

Accuracy: 0.01% of Reading + 0.005% of Full Scale

Input Impedance: V1:(41-400Vrms Range) Input=222kO, V2: (15-40Vrms Range) Input=22kO

Current: 200Arms for 2 seconds-15Arms Continous

Current Accuracy: 0.25% of Reading + 0.005% of Full Scale

Input Impedance: Internal Shunt=0.008O

Trigger Sensors: RMS, Frequency, Harmonic, THD, Sequence (=/-/0), Watts, VAR, Over, Under, or Either, Rate of Change

Quantity: Multiples of 32 (Unrestricted)

Function: Digital Fault Recording (DFR), Sequence of Event Recording (SER), or Both

Input Range: 40VDC-250VDC

Current Draw: 2mA

Isolation: 2000Vrms Channel-to-Channel, 2000Vrms Channel-to-Ground

Trigger Sensors: Normal to Abnormal, Abnormal to Normal, or Either

IRIG-B (Modulated): <1 millisecond

IRIG-B (Un-Modulated) <1 microsecond




Clock Sync Loss

Disk Full

PC Health


Nominal Input Voltage/ Acceptable Input Voltage Range
48 VDC/36-75VDC
125 VDC/66-154 VDC
250 VDC/100-375 VDC

Temperature: 0-55 C AMBIENT (All components are industrial & each rated to at least 85C or higher)

Humidity: Up to 90% Non-Condensing


At USI, we don’t appreciate hidden costs and we don’t think customers should ever have to endure them. Therefore, unlike some of our competitors, all of our software (both the web-based user interface and pre-loaded software on the system), software updates for the entire life of the Model 9000, access to user-manuals, call-in customer service and support, and the 5-year limited warranty on hardware are all included in the cost of each Model 9000 DME System. Additionally, customers are able to purchase the Model 9000 and all of its wonderful, all-in-one features, software, and support for an extremely reasonable and competitive price. We don’t think DME users should have to break the bank in order to purchase a state-of-the-art, reliable, and user-friendly DME, and The Model 9000’s price reflects just that: A world-class product at an affordable price. Contact USI today to ask for a quote.