Numerical Relay Development Environment System

Numerical relay development environment system

Technical specifications:

Numerical Relay Development Test Bench abilities

- Implement and test any relay algorithm for applicability in real time environment.

- Take input from software simulated data to have any simulated condition.

- Carry out research.

- Use for simulation of COMTRADE file generated by relay in field.  

- Perform the simulation of the developed and coded Relay Algorithm, uploaded through NRDE Setup using RS232 port

- Program the LCD Display, Soft push buttons and Status Indicator LED using RS232 port, provided for data exchange

- Generate the required Voltage and Current Waveform using Computer software and DAC Card provided. The same has to be fed into NRDE Main unit using 8 Analog input channels provided based on the requirements.

- Show the relay operation for respective algorithm and analog inputs using the LCD Display and LED Status indicators.

- Give a stopping input signal using NRDE Relay trip command.

- Fetch digital input to take external trigger command if required by the algorithm.

Software Components of Numerical Relay Development Test Bench

NRDE application

- For configuring NRDE analog channels

- For feeding simulation data to NRDE

• Option to generate steady state waveforms

• Option to read simulation data from text file

- MPLAB X IDE

• Platform for developing the relay algorithm (embedded C language)

- COMTRADE viewer • For viewing COMTRADE files

• For converting COMTRADE file to text file compatible with NRDE

- Pre-defined Firmware libraries in MPLAB - NRDE Hardware initialization

- Instantaneous and RMS value of all channels

- Real and Imaginary components of all channels

- Phase angle computation

- 1ms counter.

- LCD display function

- LED indication function

- Relay trip command function

- External trigger input function

Hardware Components of Numerical Relay Development Test Bench

- DAC card to convert the output of PC-based waveform into analog signals

• 100k sample/s and voltage range of +/- 10 Vp

• PC based waveform through any EMTP type simulation package or from COMTRADE file

- Data acquisition through 8 analog input channels

• Two 3-phase channels

• Two 1-phase channels (can be any analog data)

- The A/D converts analog signal into samples and the Fourier technique to compute the magnitude of the signal - Implementation to be based on very high-speed DSP controller

- Serial interface for programing the relay algorithm

- Output options

• 4x20 LCD Display

• 4 Status LED

• 4 Digital trip command (will stop the input signal)

- Digital trip command to be configured to PC through the DAC card

- Flash memory (planned enhancement)

• Waveform capture – similar to disturbance recorder in relays

• Variable capture – to save the variable in algorithm. Will help to access the performance of the scheme

- Serial port to exchange the files in Flash memory

- Digital inputs

• The algorithm can take external trigger command through this

- Optional GPS time synchronization