Siemens 7SR12 Argus - Page 335

7SR11 & 7SR12 Commissioning and Maintenance Guide
©2017 Siemens Protection Devices Limited Chapter 6 Page 51 of 72
Gradually increase voltage until Pickup LED operates.
Apply 2x setting voltage and record operating time,
Apply a higher multiple of setting voltage and record operating time.
Compare to calculated values for operating times from:
( )
[ ]






−
=
1
1
sec
Vs
Vn
op
Mt
Where M = Time multiplier and Vn/Vs = multiple of setting.
Phase
Setting
(Volts)
TM
Operate Voltage
Operate Time
P.U.
(Volts)
D.O.
(Volts)
Tolerance
@ 2 x Vs
(sec)
@ - x Vs
(sec)
Tolerance
E
2.14.7.1 Element Blocking
The Neutral Overvoltage elements can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
59NIT
59NDT
Check correct indication, trip output, alarm contacts, waveform record.
When testing is complete reinstate any of the disabled functions.