Abstract
The fault indicator for overhead distribution lines is used
indicating of phase-to-phase and phase-to-earth faults by
determining short circuit, over-current and power features to
detect faults and provide a local light indication. In addition,
the indicator also has current measurement and wireless data
communication capabilities, by sending the fault signal to FTU,in
order to comply the function of the remote communication and the
remote monitoring, to help operators to find the point of failure
quickly and shorten the outage time and improve reliability.
Principle
The fault indicator installed on the overhead lines, which clipped
on each phase so that to detect current and Voltage signal in this
phase using itself clipped line structure. Through the low-power
chip, it completes current calculation, short circuit, ground fault
detection, and through built-in low-power RF modules achieves short
distance wireless communication.After the indicator is installed,
the line current has been measured . When the current meet the
characteristics of the fault, the indicator immediately sends the
fault current and the fault information to the nearest terminal
device by the RF, while triggering a flop and flash indication.The
lineman simple follows the flashing fault indicators all the way to
the first non-flashing fault indicator, thereby identify the fault
location.The terminal device receives the fault information can
further upload, so master station can get useful information and
determine the fault zone according to the sub-station uploaded
information.
Remote terminal uint is to receive the circuit fault information
and circuit load operation information from overhead indicator
installed in the circuit via wireless for analysis and compiling
and then sends the information to main distribution network station
via GPRS/GSM communications, to realize the online monitoring,
fault detection and positioning functions of distribution network.
Main features
GSM or GPRS forwarding | GSM (short messages) and GPRS (data) are mutually the standby mode,
which are used to send the substation condition, circuit load
current, indicator status and fault information to main
distribution network station, to ensure the reliable transmitting
of distribution network fault information. |
Remote upgrade | The equipment program can be upgraded conveniently through master
remote maintenance station. |
Work mode setting | The terminal can be in the two-remote or one-remote working mode by
setting the intrinsic parameters of remote terminal uint. |
Functions
1. Wireless receiving: the fault point information and load current
information sent by indicator are received via short-range wireless
network mode.
2. GSM or GPRS forwarding: GSM (short messages) and GPRS (data) are
mutually the standby mode, which are used to send the substation
condition, circuit load current, indicator status and fault
information to main distribution network station, to ensure the
reliable transmitting of distribution network fault information.
3. Solar power supply: the solar power supply mode is applied, and
the maintenance-free 8AH lead-acid battery or 12AH lithium iron
phosphate battery is provided, with the working temperature range
of both batteries of -35℃~75 ℃ and -20℃～75℃ separately.
4. Optional communication protocol: IEC870－5－101 protocol or 104
can be selected for the connection with the third party equipment
to upload the fault and shift information.
5. Remote upgrade: the equipment program can be upgraded
conveniently through master remote maintenance station.
6. Convenient maintenance: the parameter setting and equipment
maintenance can be performed conveniently via wireless setting
terminal.
7. Event recording: the device can record the maximum 500 pieces of
SOE events, providing the rich data support for system fault
analysis.
