ABB RET670 Installation And Commissioning Manual

13.7.4 Overexcitation protection OEXPVPH
Prepare the IED for verification of settings as outlined in section "Overview" and
section "Preparing for test" in this chapter.
13.7.4.1
Verifying the settings
1. Enable frequency measuring (FRME) function.
2. Connect a symmetrical three-phase voltage input from the test set to the
appropriate connection terminals of the overexcitation protection OEXPVPH
is configured for a three-phase voltage input.
A single-phase injection voltage is applied if the function is configured for a
phase-to-phase voltage input.
The OEXPVPH is conveniently tested using rated frequency for the injection
voltage and increasing the injection voltage to get the desired overexcitation
level.
3. Connect the alarm contact to the timer and set the time delay tAlarm
temporarily to zero.
4. Increase the voltage and note the operate value V/Hz>.
5. Reduce the voltage slowly and note the reset value.
6. Set the alarm time delay to the correct value according to the setting plan and
check the time delay, injecting a voltage corresponding to 1.2 · V/Hz>.
7. Connect a trip output contact to the timer and temporarily set the time delay
tMin to 0.5s.
8. Increase the voltage and note the V/Hz>> operate value
9. Reduce the voltage slowly and note the reset value.
10. Set the time delay to the correct value according to the setting plan and check
the time delay tMin, injecting a voltage corresponding to 1.2 · V/Hz>>.
11. Check that trip and alarm contacts operate according to the configuration logic.
12. Set the cooling time constant temporarily to min value (1min.) to quickly
lower the thermal content.
13. Wait for a period equal to 6 times Tcooling switch 20 minutes on a voltage
1.15 · V/Hz> and check the inverse operate time.
Wait until the thermal memory is emptied, set the cooling time constant
according to the setting plan and check another point on the inverse time
curve injecting a voltage 1.3 · V/Hz>.
14. Finally check that START and TRIP information is stored in the event menu.
13.7.4.2 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
Section 13 1MRK 504 088-UEN C
Verifying settings by secondary injection
158
Installation and commissioning manual

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24