Table of Contents
Advertisement
Section 10
Testing functionality by secondary injection
( )
t s
IECEQUATION2428 V1 EN-US
where:
t(s)
k1
U
U1<
For example, if the measured voltage jumps from the rated value to 0.8 times the set start
voltage level and time multiplier k1 is set to 0.05 s (default value), then the TR1 and TRIP
signals operate at a time equal to 0.250 s ± tolerance.
10.
The test above can be repeated to check the inverse time characteristic at different voltage
levels.
11.
Repeat the above described steps for Step 2 of the function.
Extended testing
The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.
10.5.1.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
10.5.2
Two step overvoltage protection OV2PTOV
Prepare the IED for verification of settings as outlined in section
section
10.5.2.1
Verifying the settings
Verification of single-phase voltage and time delay to operate for Step 1
1.
Apply single-phase voltage below the set value U1>.
2.
Slowly increase the voltage until the ST1 signal appears.
3.
Note the operate value and compare it with the set value U1>.
For phase-to-earth measurement:
U
100
IECEQUATION2426 V1 EN-US
For phase-to-phase measurement:
100
For example, if the inverse time curve A is selected, the trip signals TR1 and TRIP
operate after a time corresponding to the equation:
k
1
=
U
−
1
<
U
1
Operate time in seconds
Settable time multiplier of the function for step 1
Measured voltage
Set start voltage for step 1
"Preparing for test"
in this chapter.
The operate value in secondary volts is calculated according to the following
equations:
1
UBase VT
sec
>
×
×
VTprim
3
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 505 372-UEN Rev. K
"Requirements"
and
Busbar protection REB670
Commissioning manual
(Equation 17)
M13796-35 v8
M13796-25 v5
M13806-2 v6
M13806-9 v2
M13806-50 v10
(Equation 18)
Advertisement
Table of Contents
