MainsPro, SW version 1.4, ©ComAp – January 2013
MainsPro Application Guide
Purpose of this manual
The Application Guide serves for the designers and engineers, who process the necessary
documentation and implementation procedures on the installation site, where MainsPro is installed. It
contains detailed description of MainsPro functionalities its practical application.
MainsPro typical usage
MainsPro 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 move away from 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.
Typical applications of MainsPro 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
- Windmills
To Next Page
Loading...
