Model 9000 DME system

the flagship DME System

disturbance monitoring equipment

The model 9000 dme system is a fully functioning, all-in-one:

Model 9000 Computer

disturbance monitoring equipment

Model 9000 Software

system architecture and modular design

Model 9000 Applications

The Digital Fault Recorder

Digital Fault Recorder (DFR)
Sample Frequencies2400, 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 records 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 records status changes that occur 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 within the traditional, all-included Model 9000 DME Unit, or can also be ordered in a stand-alone, SER-only M9000 Unit for users who only need an SER function. Please contact USI for 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 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 simultaneously. This add-on package requires no additional hardware or modification to an existing Model 9000 DME System installation. The PMU application features Syncrophasors 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 Syncrophasor 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 Continuous

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