| GPS-Phase Identification System |
| The SPI-II is an instrument which enables remote identification of A-B-C electrical phases from all 50 and 60 Hz networks. Besides doing identification, the instrument enables verification of phase concordance and rotation in all safety and on any network points. |
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| Introduction |
The growing complexity of electric networks, the deregulation in transiting energy and the emerging automation of operations are factors that have urged energy distributors to make sure that their equipment (default indicators, electric meters, tele-measurement and measurement equipment, SCADA remote controls, etc.) are connected on the right network phases.
The SPI-II enables correct identification of phases on any given point of an electric network. This has become more and more essential whenever one wants to optimize the planning, the operation and the upkeep of installations. |
| Operating the SPI-II system |
Phase reading is rapidly and accurately accomplished by comparing the obtained measurements on one point of the network to the others which are already known and identified. The SPI-II accomplishes this comparison by synchronizing phase A (reference) samples and the sample of the phase to be identified (measurement) using a signal originating from the GPS satellite network.
The system comprises two units: the set unit (reference) and the mobile unit (measurement).
The mobile unit allows the user to identify the
phases on any point of an overhead or
underground network, no matter the physical
distance separating it from the set unit of
reference.
During the measurement, the distant module
(reference) transmits a sample of the reference
phase A, synchronized by GPS, towards the
mobile unit. The transmission is made on
demand from the mobile unit by cellular phone.
The measurement module is used to make
phase detection. This can be accomplished by
directly connecting to the network with a wall
socket or socket capacitor on a cable.
The measurement phase on an overhead
network uses the probe for the exterior SPI-IISx,
set on a handling rod. The measurement module,
then placed at the lower end of the rod, receives
the data from the sensor by infrared link.
The repeat module then compares the sample of
the measurement module, which was received
by radio link along with the (phase A) sample
received by phone from the reference unit.
The A, B or C comparison result is then posted
on the measurement module. |
| Wireless Technology |
| The exchanged data between modules are transmitted through different types of wireless links, such as: by infrared (short distance), by radio (medium distance), by cellular linkage (long distance), Bluetooth and finally, by GPS (very long distance). As for measurement taking, the user only handles the measurement module, which is similar in size and in weight to a flash light. Furthermore, the absence of cables facilitates storage and equipment maintenance. |
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