1 Year Warranty
Description
Overview
Essential details：LGPG111 Digital Integrated GeneratorProtection Relay
Features
l An optimum mix of generator protection functions
lApplicable to a wide range of generators
lUser configurable scheme logic
lAn alternative setting group
lWide operative frequency range
lDisplay of measured values
lFault, event and disturbance recording
lIntegral testing to aid commissioning
lRemote serial communications
lPower-on diagnostics and self- monitoring
lEight optically isolated logic inputs for monitoring external plant.
Type LGPG111 Digital Integrated Generator Protection Relay
Figure 1: Relay Type LGPG111 Introduction
The LGPG111 is a multi-function relay which integrates a number of common generator protection functions and associated scheme logic into a single relay case.
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LGPG111 Digital Integrated GeneratorProtection Relay
LGPG111
Incorporating 14 separate generator protection functions (see Figure 2).
Application
The LGPG111 can be applied to a wide range of generators. Each of its protection functions can be enabled or disabled to suit individual requirements. This approach avoids the need for application-specific relay versions, and simplifies the tasks of relay specification, evaluation and project planning. The integrated scheme logic eliminates much panel engineering work by reducing the need for auxiliary relays and associated external wiring.
Contacts from external protection and plant monitoring equipment can be connected to any of the eight optically-isolated inputs. This allows external information to be incorporated into the relay’s user- configurable scheme logic.
The optically-isolated inputs and relay outputs may be labelled in the software for local or remote monitoring.
These functions can be recorded in the alarm and event recording facilities.
The protection functions provided by the LGPG111 relay are as shown in Figure 2.
Functions
Generator differential (87G)
The generator differential function is for the protection of phase to phase or three-phase stator windings faults which normally involve high fault currents, so that fast fault clearance is required. This function works on a per phase basis and has a dual slope bias characteristic as shown in Figure
3: the lower slope provides sensitivity for internal faults, whereas the higher slope provides stability under through fault conditions, especially if the generator CTs saturate.
