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5 Introduction of Application
Guide
5.1 Purpose of this manual
5.2 MainsPro G99TT typical usage
5.3 Typical applications of MainsPro G99TT protection relay
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5.1 Purpose of this manual
The Application Guide serves for the designers and engineers who process the necessary documentation
and implementation procedures on the site where MainsPro G99TT is installed. It contains detailed
description of MainsPro G99TT functionalities and their practical application.
5.2 MainsPro G99TT typical usage
MainsPro G99TT is a mains protective relay protecting operation of parallel-to-mains generators or other
electrical resources of distributed generation of electricity. The main purpose is to prevent unwanted
interaction between the generator and mains in case of its abnormal state (e.g. mains failure):
Specific situations may occur, causing e.g. the utility network to momentarily disconnect part of the
network and connect it back by automatic-recloser. During this fault-clearing period, the generators may
get out of synchronism and their eventual re-connection may cause severe damage to the property of the
generator operator, or to the utility equipment.
The sole operation of a generator into an unintentionally islanded part of electricity network provides
potentially dangerous situation. The load of the area may exceed the generator capacity and cause
instability of the voltage, delivered to the consumers connected in the islanded area.
Severe hazards may occur to the working personnel on the grid equipment in the area, where the mains is
presumed as failed, but there are still generators delivering power into this area without central control of
their operation.
These are some of the situations, leading the utilities to strictly require that any parallel connection to the
mains is approved and protection devices with required protective features are installed.
5.3 Typical applications of MainsPro G99TT
protection relay
These are installations of any sources of electrical energy. For example:
Cogeneration
Peak-lopping power stations
Stand-by generators with soft return/short-time parallel operation with mains
Microturbines
Small hydro power plant
Photovoltaic power plant
Wind power plant
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MainsPro G99TT 1.0.0 Global Guide
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