D02706R02.30
L-PRO 4000 User Manual
Appendix C-1
Appendix C Hardware Description
The relay is a complete line distance protection relay package designed and
manufactured with high quality features and recording components. The fol-
lowing information describes the main hardware components of the relay:
Main Processor
Board (MPB)
The MPB has two processor sub-systems which control the operation of the en-
tire relay: the DSP processor and the control processor. The DSP sub-system
interfaces to the RAIB, the DIB and the OCB and manages the protection fea-
tures of the relay. The control processor manages the user interface and system
control features of the relay. Both subsystems operate independently of each
other and will continue to function even if the other sub-system fails.
The MPB provides the following functionality:
• DSP processor subsystem which interfaces to the RAIB, the DIB and the
OCB and manages the protection features of the relay, with:
• The floating point DSP to provide fast capture and manipulation of
data.
• RAM and reprogrammable non-volatile Flash memory. Allows oper-
ation independent of the control processor and supports field software
updates.
• A control processor subsystem which manages the user interface and sys-
tem control features of the relay, with
• RAM and reprogrammable non-volatile Flash memory. Allows oper-
ation independent of the DSP processor and supports field software
upgrades.
• Settings and recordings stored in non-volatile memory.
• Runs a Real Time Operating System (RTOS).
• Provides Ethernet ports and RS-232 ports for modem, SCADA, COM
and USB interfaces.
• A time synchronism processor with automatic detection of modulated and
un-modulated IRIG-B
• A high speed link is provided between the DSP and control processor sub-
systems.
• Sophisticated fault detection and “watchdog” recovery hardware
• The MPB also provides the power supply for the entire unit. The power
supply operating range is 48-250 Vdc, 100-240 Vac, +/-10%, 50/60 Hz.
This wide operating range provides easier installation by eliminating pow-
er supply ordering options
Digital Input
Board (DIB)
This board provides 9 digital input channels. Inputs are optically isolated, ex-
ternally wetted, and factory preset to the customer’s requested voltage level of
48, 110/125 or 220/250 Vdc. This board interfaces to the MPB.
Summary of Contents for L-PRO 4000
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