utomatic entry reserve - this method of
protection designed for the smooth operation
of the electricity network. Enabled by means of an
automatic connection to a network of other sources
of supply in case the main source of power supply
failure.
Automatic transfer switch (ATS) connects a
backup source of power, while the break power of
0.3-0.8 seconds (backup time switch operation).
The main objective AVR- timely operation within
minimum possible time that has elapsed since turn
off the main power source, and therefore the
automatic input of a reserve - a task that must be
solved only by qualified personnel.
To ATS requirements:
shall operate in the shortest possible after
disconnecting the power source working time.
must always be triggered in the event of power
failure on buses consumers, regardless of the
cause.
In the case of ABP arc protection circuit can be
blocked in order to reduce damage from short
circuits.
In some cases, a switching delay ATS.
For example, when you run the powerful engines
on the consumer side, the ATS scheme should
ignore under voltage.
ATS must be triggered once. This requirement is
due to the inadmissibility of multiple inclusion of
backup sources in a short circuit. As the
measuring element for the ATS in high voltage
networks are under voltage relay (controller
Atmega 8) connected to the protected areas using
voltage transformers. In the case of a voltage drop
in the electrical network protected plot relay gives
signal to the ATS circuit. However, the lack of
voltage condition is not sufficient to ensure that the
ATS unit began its work. As a general rule, it
should be satisfied with a number of conditions:
In the protected area there a short circuit.
Since the voltage drop may be due to a short circuit,
the inclusion of additional power sources into the
circuit and inexpedient impermissible. Main
disconnect switch is turned on. This condition is
checked to the ATS does not work when the voltage
has disappeared due to the fact that the main switch
was switched off intentionally. On the
neighboring property, which is supposed to be
supplied after the ATS action voltage is present. If
both supply lines are not energized, the switch does
not make sense.
ATS consists of three main components:
1) Block logic and display - is the "brain" ATS,
which constantly monitors the voltage in the core
network, and operating the generator. "The brain"
commands the relay automation, as well as the
contactors to open or close.
2) The power of the ATS. It includes contactors and
machines.
A