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STUDY ON PREVENTING OVERRIDE TRIP SYSTEM UNDER
COALMINE ELECTRIC NETWORK BASED ON CAN BUS
Abstract
When in the mine power distribution system ，power
transmission line Protection Relay frequently uses without time limit instantaneous trip current
protection over current protection zero sequence protection and other relay protection ways.
The current setting of instantaneous trip current protection device should evade the most two
short circuit current of this section of line terminal. But all levels of lines in power supply
systems are quite short, when the terminal line breaks down, the difference of each section
fault current value is small, and protection cannot protect the entire section line. When line
terminal is short circuit, in the substation high voltage bus drops excessively lowly, it is
influential to the other return route normal work.
Industrial field bus-CAN bus effectively realizes the various
protective devices to coordinate each other, meets all levels of the selectivity, quick break, and
provides the possibility of preventing grade trip. In this system, all levels of protections
constitute distributional structure through the CAN Bus, but if it realizes to make the control
upper and lower layer protection coordinate mutually by the upper and lower layer
correspondence, carrying on the selective movement, it must depend upon the CAN controller
to proceed the data receiving and dispatching, therefore the rational design of CAN controller
became key to ensure system smooth implementation.
This paper introduces the regional selective interlock
protection system based on CAN bus ,and elaborates the circuit design of micro-controller using
enhanced microcontroller as core CPU and CAN controller interface ,includes the hardware and
the software design of CAN node. The microcontroller as slave computers connects in series to
ripping signal return, follows the instructions from host computer to Start up and lock-up
control Protection Equipment.
BLOCK DESIGN PROPOSAL FOR THE SYSTEM
PC WORK
STATION
CAN RX
MAX 232
CONTROLLER
SECTION
CAN TX
SECTION
CONTROLLER
TRIP-RELAY
SECTION
ANOLOG
VOLTAGE
INPUT
HARDWARE REQUIREMENT FOR IMPLEMENTATION OF THE FUNCTION MODULE

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CONTROLLER (ARM7 LPC 2103/AT89S52).
MCP 2515 CAN CONTROLLER
MCP 2551 CAN TRANSIVER
ANALOG SENSORS(2 No’s).
P.C.
POWER SUPPLY UNIT
MAX 232 IC.
MISCELLINOIUS COMPONENTS.
SOFTWARE REQUIREMENT FOR IMPLEMENTATION OF THE FUNCTION MODULE
FOR AT89S52 BASED:
 The KEIL U version IDE which Keil C51 Product is a complete software development
environment for the 8051 microcontroller family.
 Us Flash+ Ver. 4.0.0 programmer for MCS51 microcontrollers developed by UC micro
systems.
FOR LPC 2148 BASED:
 The KEIL MDK-ARM is a complete software development environment for ARM7 (LPC
2148) and ARM9 processor-based devices.
 Flash the device using FLASH MAGIC, a free software utility sponsored by NXP.
LANGUAGE:
 All editions provide a complete Embedded C/C++ development environment and KEIL
includes extensive middleware libraries.
PLATFORM:
 WINDOWS XP.