ABB REL670 Installation And Commissioning Manual page 133

9.1.2
9.1.3
9.1.4
Multipurpose protection
10. Finally check that start and trip information is stored in the Event
menu.
Information on how to use the event menu is found in the IED670 oper-
ators manual.
Overcurrent feature with current restraint
The current restraining value has also to be measured or calculated and the influence on the op-
eration has to be calculated when the testing of the operate value is done.
Procedure
1. Operate value measurement
The current restraining value has also to be measured or calculated and
the influence on the operation has to be calculated when the testing of the
operate value is done.
Overcurrent feature with voltage restraint
Procedure
1. Connect the test set for injection of 3-phase currents and 3-phase
voltages to the appropriate current and voltage terminals of IED670.
2. Inject current(s) and voltage(s) in a way that relevant measured (ac-
cording to setting parameter CurrentInput and VoltageInput ) cur-
rents and voltages are created from the test set.
Overall check in principal as above (non-directional overcurrent feature)
3. Operate value measurement
The relevant voltage restraining value (according to setting parameter
VoltageInput) has also to be injected from the test set and the influence
on the operate value has to be calculated when the testing the operate val-
ue is done.
4. Operate time measurement
Definite times may be tested as above (non-directional overcurrent fea-
ture). For inverse time characteristics the start value (to which the over-
current ratio has to be calculated) is the actual pickup value as got with
actual restraining from the voltage restraining quantity.
Overcurrent feature with directionality
Please note that the directional characteristic can be set in two different ways either just depen-
dent on the angle between current and polarizing voltage (setting parameter DirPrinc_OC1 or
Dirprinc_OC2 set to or in a way that the operate value also is dependent on the angle between
current and polarizing voltage according to the I x cos( Φ ) law (setting parameter DirPrincOC1
or DirPrincOC2 set to I x cos( Φ ). This has to be known if a more detailed measurement of the
directional characteristic is made, than the one described below.
Chapter 11
Verifying settings by secondary
injection
125