124
Multipurpose protection
Chapter 11
Verifying settings by secondary
injection
9
Multipurpose protection
9.1
General current and voltage protection (GAPC)
One of the new facilities within the GF function is that the value which is processed and used
for evaluation in the function can be chosen in many different ways by the setting parameters
CurrentInput
and
VoltageInput
.
These setting parameters decide what kind of preprocessing the connected three-phase CT and
VT inputs shall be subjected to. That is e.g. single-phase quantities, phase-to-phase quantities,
positive sequence quantities, negative sequence quantities, maximum quantity from the 3-phase
group, minimum quantity from the 3-phase group, difference between maximum and minimum
quantities (unbalance) can be derived and then used in the function.
Due to the versatile possibilities of the GF itself but also the possibilities of logic combinations
in the CAP-configuration of outputs from more then one GF function block it is hardly possible
to define a fully covering general commissioning test.
9.1.1
Built-in overcurrent feature (non-directional)
Procedure
1.
Go to the Test/Function Test Mode/Multipurpose protection menu
and make sure that the GF to be tested is unblocked and other func-
tions that might disturb the evaluation of the test are blocked.
2.
Connect the test set for injection of 3-phase currents to the appropri-
ate current terminals of IED670.
3.
Inject current(s) in a way that relevant measured current (according
to setting parameter CurrentInput) is created from the test set. In-
crease the current(s) until the low set stage operates and check
against the set operate value.
4.
Decrease the current slowly and check the reset value.
5.
Block high set stage if the injection current will activate the high set
stage when testing the low set stage according to below.
6.
Connect a trip output contact to the timer.
7.
Set the current to 200% of the operate value of low set stage, switch
on the current and check the time delay.
For inverse time curves, check the operate time at a current equal to 110%
of the operate current at
tMin
.
8.
Check that trip and start contacts operate according to the configu-
ration logic.
9.
Release the blocking of the high set stage and check the operate and
reset value and the time delay for the high set stage in the same way
as for the low set stage.
Содержание RELION REL670
Страница 8: ...Contents ...
Страница 54: ...46 Checking the optical connections Chapter 6 Checking the external optical and electrical connections ...
Страница 72: ...64 About this chapter Chapter 9 Establishing connection and verifying the LON communication ...
Страница 78: ...70 Downloading settings and configuration from a PC Chapter 10 Configuring the IED and changing settings ...
Страница 174: ...166 Remote communication Chapter 11 Verifying settings by secondary injection ...
Страница 190: ...182 Maintenance Chapter 13 Fault tracing and repair ...
Страница 198: ...190 Glossary Chapter 14 Glossary ...