Mehta Tech Solutions

Innovation to Meet Tomorrow's Challenges

Mehta Tech is an innovation leader awarded over 15 US Patents for our proprietary technologies. We pioneered the concept of the conventional DFR evolving into a multifunction device to collect and deliver data while providing calculation results for various O&M, automation, and visualization applications.

Over the years, Mehta Tech's modular design has enabled easy, cost-effective upgrades to incorporate the latest advances in hardware and software. Our digital fault recorders have demonstrated the highest levels of reliability.

Our current systems exceed the NERC PRC-002 requirements for Fault and Disturbance Monitoring Equipment. IEEE C37.118 standard compliance for continuous recording and phasor streaming are stock features in our equipment.

The TRANSCAN DME is a multifunction data collection platform for data collection and local storage of triggered and continuous recordings and phasor data. It uses an expandable chassis that monitors 64 analog and 128 digital inputs. Cross-trigger and remote trigger capabilities are supported, which enable the integration of multiple DME subsystems in an extensive substation installation.

The modular design of the TRANSCAN DMEs enables our customers to inexpensively upgrade or expand their installed systems to the latest hardware and software level to satisfy the ever-changing regulatory environment. Options for system installations include in open racks or cabinets, as retrofit units to replace existing recording equipment, or as a complete turnkey installation.

Our multifunction DFR/PMU products support local storage of high-speed recordings initiated by trigger detection, slower-speed continuous recording, and phasor data streaming. Using versatile facilities to select parameters allows our users to configure the installation to meet site and application requirements by combining the following functions: DFR/SOE Digital Fault and Event Recorder, DDR Dynamic Disturbance Recorder, DME Disturbance Monitoring Equipment, PMU Phasor Measurement Units.

Flexibility: Mehta Tech develops and maintains configurable and adaptable designs to create customer and site-specific implementations.

Upgradeability: Ownership of the hardware, software, and architecture IP allows installed systems to be upgraded, resulting in the lowest lifetime cost within the industry.

Reliability: “Utility Grade” ruggedized designs are built and tested to last.

TRANSCAN DME Capabilities

Data Collection

Up to 64 analog, 128 digital inputs
Synchronized Phasor Measurement

Triggers and trigger-initiated recordings:

Various fault, and power and frequency triggers
Fault recording at user selectable rates – typically at 96 samples per cycle
Analog values for NERC DDR and synchrophasor applications
Cross-trigger and remote trigger capabilities

Phasor Data Streaming:

30 or 60 frames per second, IEEE C37.118 compliant
Up to 60 phasor values per frame, individual phases and Positive Sequence phasors

Remote Isolation Options

Single Phase TRANSIG

The 9699 model is a rail-mounted current transformer with two terminals for the transformer secondary and ground lugs for the chassis ground. Wiring connections for the transformer secondary outputs are to compression-type terminal blocks. When incorporating the DFR Low Current Analog Input Isolation modules, the Transig units are needed.

3-Phase TRANSIG

The 9701 model is a plate-mounted 3-phase current transformer with six terminals for the secondary transformer and a ground lug for the chassis ground. Wiring connections for the transformer secondary outputs are to compression-type terminal blocks. When incorporating the DFR Low Current Analog Input Isolation modules, the Transig units are needed.

Split Core CT

The Split-Core Current Transformer interfaces with the analog isolation devices. It is designed for indoor use only and as an auxiliary CT, and breaking the CT circuit is not necessary when deploying the Split-Core CT.

Remote Isolation Module w/ Test Switches

The 9766 model is a self-contained cabinet-mounted isolation module installed into any standard 19" (24" w/adapter) equipment cabinet. The standard configuration is 4RU in height, and all wiring connections are barrier-type terminal blocks.

TRANSCAN Master Station Software is the user interface that provides customizable system configurations, data communication, SER Reporting, record format & file conversions, COMTRADE data formatting, and the display and analysis of system behavior.

Easy-to-use master station software is provided to help the user set up the recorder, retrieve records, view and analyze the data. This software is available for the Windows environment. The basic program functions include the following:
• Configuration and Calibration
• Graphical Display and Printing
• Communications between IEDs and local or remote master station computer.

Software Capabilities

Configuration and Calibration Software

This software unlocks the power of the recorder by allowing users to configure independent recorder functions and triggers within each recorder. TRANSCAN recording parameters may be modified by software, either from a local computer or remotely from the Master Station.

Trigger types and levels may be independently set for each channel.

Communication Software

The communication software developed by Mehta Tech allows the user to communicate between a local computer, remote master station and the DFR in the substation, via the IPCU 2.

Data can include analog values, calculated values, and digital input status.
Data files also include station name, record number, date and time.

Graphical Display and Printing

After retrieval of stored data, the graphical display program is an invaluable tool in analyzing system disturbances. This software allows eleven user-definable display formats which can be saved for each DFR. The display and analysis software is also the launching point for the various analysis tools.

Optional Analysis Capabilities Software

Mehta Tech has developed a number of optional software tools to help the user to analyze records. These include the following:

Calculate symmetrical components (Negative, Zero, and Positive Sequences)
Calculate deviation from base frequency
Calculate total harmonics (up to 48th)
Calculate amplitude values of currents and voltages
Calculate real and reactive power
Calculate phase angle
Calculate apparent line impedance
Calculate distance to fault
Conversion to COMTRADE 1999 or 2013 format

Mehta Tech Innovations