Mehta Tech, Inc. » Specs
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; 12 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
16 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 64 phasor / values, UDP and TCP/IP communication with authentication

TIME REFERENCE

IRIG-B time stamp; internal clock:  External GPS clock / receiver optional

OPERATIONAL POWER REQUIREMENTS
90 to 300 Vdc; 90 to 250 Vac, 47-70 Hz
Optional 48 Vdc

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