Mehta Tech, Inc.Specs | Mehta Tech, Inc.
Mehta Tech, Inc.

TRANSCAN Digital Fault Recorders (DFRs)

Specification Summary

ANALOG CHANNELS (CURRENT OR VOLTAGE)
16 to 64 per chassis. Larger systems can be built by using cross-triggering

AC CURRENT INPUT RANGE (CTs)
5 A nominal; 15 A continuous; 63 A one minute; core saturation @ 60 Hz = 140 A.
1 A input optional. Options for split-core, clamp-on and Transig interfaces

AC POTENTIAL INPUT RANGE (VTs)
67 to 120 Vac nominal, 100% over-range

ISOLATION FREQUENCY RESPONSE
CT inputs: 100 A maximum, < 3 dB from 1.0 Hz to 10 kHz
VT inputs: 150 V maximum, < 3 dB from 4 Hz to 10 kHz
DC isolation: < 3 dB from DC to 2.5 kHz

AC INPUTS BURDEN
CT: Less than 1 VA at 5 A nominal
VT: Less than 0.25 VA at 67V nominal

EVENT CHANNELS
8 to 128 per system cabinet

EVENT (DIGITAL) INPUT RANGE
5 to 250 V; wet or dry inputs

ALARM OUTPUTS
Seven status and alarm outputs; 150 Vdc, 125 mA contact rating, NO or NC

ELECTRICAL TESTS
Dielectric: IEEE C37.90
SWC: IEEE C37.90.1

SCAN RATE (60Hz applications)
720 to 5,760 samples/second

A/D RESOLUTION
16-bit A/D converters

INTERNAL MEMORY
16MB standard, 32MB optional; 255 record capacity, non-volatile solid-state storage

RECORD LENGTH PARAMETERS
Pre-trigger and post-trigger periods; minimum and maximum record lengths

SOFTWARE TRIGGERS (DSP based)
Standard digital: Change from normal to abnormal state; any change of input state
Standard analog: Over and under voltage; over current; negative, zero, and positive sequence; frequency (over and under); rate-of-change of voltage

COMMUNICATION Interfaces
Front panel USB port, rear panel RS-232 ports; up to 115.2 kbps standard. Internal modem and 100 Mbps Ethernet interface options

OPTIONAL DDR (Continuous Recording) & PMU Functionality
Information Processing & Communications Unit (IPCU) with 1 Gbps Ethernet, network, 60+ day once-per-cycle continuous recording functionality for disturbance / long term recording applications, 32GB or 64GB nonvolatile, solid-state (SATA) drives for fault,  dynamic disturbance recording (DDR) and/or local phasor data storage IEEE C37.118 compliant phasor data streaming, supports streaming up to 60 phasor / values, UDP and TCP/IP communication with authentication

TIME REFERENCE

IRIG-B time stamp; internal clock:  External GPS clock optional; IRIG-B failure alarm

OPERATIONAL POWER REQUIREMENTS
90 to 300 Vdc (or 120 Vac for test purposes)

PHYSICAL DIMENSIONS (inches)
Rack-mounted: 22” W x 90” H or 27” W x 90” H (typical)
Cabinet-mounted: 29” W x 29” D x 90” H  or 24″ W x 24″ D x 90″ H

WEIGHT (pounds)
Rack-mounted: 500 pounds (typical)
Cabinet-mounted: 800 pounds (typical)

AMBIENT TEMPERATURE
0 °C to +55 °C

RELATIVE HUMIDITY
5% to 90% relative humidity, non-condensing; optional cabinet heater with rear door vent for humidity control

WARRANTY
2, 5, 10 year system warranty options


Specifications are subject to change without notice