ALIND AN Series, Руководство пользователя

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USER GUIDE Page 8 of 16
ANC 303
ALUMINIUM INDUSTRIES LIMITED
Relays Division
1. DSP Controller
The dsPIC DSC (Digital Signal Controller) is a 16-bit modified Harvard RISC (Reduced
Instruction Set Computer) machine that combines the control advantages of a high-performance
16-bit microcontroller with the high computation speed of a fully implemented Digital Signal
Processor (DSP).
The DSP controller continuously monitors the currents and voltages. Based on this the controller
performs different calculations and whenever an abnormal condition occurs it distinguishes the
type of fault and issues trip command to the circuit breaker.
2. Data Acquisition
The Current signals are scaled and isolated using Current Transformer (CT). These isolated
analog signals are filtered to minimize the effects of electromagnetic interference and noise in
the high frequency range.
The analog signals are then fed to the Analog to Digital Converter which has a 16 bit resolution.
The DSP controller will take the 32 samples per cycles of each Current for the computational
purpose. If any fault occurs the parameters will be stored in to the non-volatile memory with
date and time stampings and this can be downloaded for further analysis in the disturbance
recorder.
3. Power Supply Module
This module gives the necessary regulated voltages like +5V, -5V, and +24V to various cards in
the module. The normal operating voltage range is 45 VDC to 170 VDC. The +24V is used for
driving the output relays in the I/O card and O/P relay card. The +5V and -5V is supplied to the
processor, I/O card and Display PCB for normal relay operations. The is5V is dedicated
to the communication ports of the relay.
4 . Communication Module
The relay is having 2 communications port, USB and RS 485. The relay is using IEC 60870-5-
103 communication protocol for communication through RS485 and USB (Proprietary).
USB Communication Port
USB port is provided for uploading/downloading relay settings and events.
1. The software is capable of analyzing the peak, RMS & average values of current, Harmonic
analysis of current waveforms and determination of fault clearing time.
2.
Waveform pointed by user displays the current & sample value of the particular point.
RS 485 Communication Port
RS 485 port is provided for SCADA connectivity. Using RS485 port online fault data of critical
parameters, disturbance record(Waveform), event record(Trip data),Automatic Supervision and
Control(healthiness of Relay),Alarm and Event Handling, Data Acquisition, Calculating and
Reporting, Parameter Setting, Resetting Indicating LEDs, Trip Circuit supervision, Relay Fail
Indication etc can be downloaded. The communication complies with IEC 60870-5-103 protocol.
5. Man Machine Interface
Man Machine Interface is through a 20x4 LCD display and keys in the front panel of the relay.
Necessary LEDs are provided in front panel for indicating the operation of different element.