Siemens Argus 7SR21 - Page 568

7SR210 & 7SR220 Commissioning & Maintenance Guide
Page 56 of 82 © 2013 Siemens Protection Devices Limited
Phase
Vs
(Volts)
DTL
(sec)
P.U. Current
Volts
Operat
e Time
2x Vs
Tolerence
E
Check correct indication, trip output, alarm contacts, waveform record.
2.10.7 Inverse Time (59NIT)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up led to operate for the function.
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:
( )
[ ]
ú
û
ù
ê
ë
é
-
=
1
1
)sec
Vs
Vn
op
Mondst
Where M = Time multiplier and Vn/Vs = multiple of setting.
P.U.
D.O.
&
TIMING
TESTS
Ph.
Vs
(V)
TM
Operate Voltage
Operate Time
P.U.
(Volts)
D.O.
(Volts)
Tol
2.x Vs
(sec)
x Vs
(sec)
Tol
E
2.10.8 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.