Neutral Overvoltage; 59Nit; 59Ndt; U/O Frequency - Siemens Argus 7SR21 Technical Manual

Description
Gn 47-2 Hysteresis
Sets the pickup to drop-off thresholds e.g. 3% picks up at
setting and drops off below 97% of setting
Gn 47-2 Delay
Sets operate delay time
3.8.

Neutral Overvoltage

Description
Gn 59N Voltage Source
Selects voltage source between calculated 3V0 (Vn) or
measured 3V0 through Vx input
3.8.1.

59NIT

Description
Gn 59NIT Element
Selects whether the inverse time neutral over voltage element
is enabled
Gn 59NIT Setting
Pickup level
Gn 59NIT Char
Selects characteristic curve to be IDMTL or DTL
Gn 59NIT Time Mult (IDMTL)
Time multiplier (applicable to IDMTL curve but not DTL
selection)
Gn 59NIT Delay (DTL)
Delay (applicable only when DTL is selected for characteristic)
Gn 59NIT Reset
Selects between an instantaneous reset characteristic or a
definite time reset
3.8.2.

59NDT

Description
Gn 59NDT Element
Selects whether the definite time neutral over voltage element
is enabled
Gn 59NDT Setting
Pickup level
Gn 59NDT Delay
Sets operate delay time
3.9.

U/O Frequency

Description
Gn 81 U/V Guard Setting
Selects voltage level below which the guard element is
applied.
Unrestricted ©2018 Siemens Protection Devices Limited
Range
0, 0.1 ... 79.9, 80
0, 0.01 ... 14300, 14400
Range
Vn, Vx
Range
Disabled, Enabled
1, 1.5 ... 99.5, 100
DTL, IDMTL
0.1, 0.2 ... 139.5, 140
0, 0.01 ... 19.99, 20
(ANSI) Decaying, 0 ... 59, 60
Range
Disabled, Enabled
1, 1.5 ... 99.5, 100
0, 0.01 ... 14300, 14400
Range
5, 5.5 ... 199.5, 200
7SR220 Settings Guide
Default
3 %
0.5 s
Default
Vn
Default
Disabled
5 V
IDMTL
1
5 s
0 s
Default
Disabled
5 V
0.01 s
Default
5 V
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