Table 1-1 Ordering Information - 7Sr21 Non-Directional Overcurrent - Siemens 7SR21 Manual

Table 1-1 Ordering Information – 7SR21 Non-Directional Overcurrent
Product description
Nondirectional O/C Relay
Multi function overcurrent
and earth fault protection
relay Protection Product
Overcurrent – Non Directional
Case I/O and Fascia
E6 case, 4 CT, 9 Binary Inputs / 8 Binary Outputs, 8 LEDs
E8 case, 4 CT, 19 Binary Inputs / 16 Binary Outputs, 16LEDs
E8 case, 4 CT, 19 Binary Inputs / 16 Binary Outputs, 8 LEDs + 6
Keys
Measuring Input
1/5 A, 50/60Hz
Auxiliary voltage
30 to 220V DC, binary input threshold 19V DC
30 to 220V DC, binary input threshold 88V DC
Communication Interface
Standard version – included in all models, USB front port, RS485 rear port
Standard version – plus additional rear F/O ST connectors (x2) and IRIG-B
Standard version – plus additional rear 1x RS485 and IRIG-B
Standard version – plus additional rear 1x RS232 and IRIG-B
Protocol
IEC 60870-5-103 and Modbus RTU (user selectable setting)
IEC 60870-5-103, Modbus RTU and DNP3.0 (user selectable setting)
Protection Function Packages
Standard version – Included in all models
37
46BC
46NPS
49
50
50BF
50G/50N
51
51G/51N
60CTS-I
64H
74TC
81HBL2
Standard version – plus
79
Additional Functionality
No Additional Functionality
©2010 Siemens Protection Devices Limited
Variants
1)
Undercurrent
Broken conductor/load unbalance
Negative phase sequence overcurrent
Thermal overload
Instantaneous phase fault overcurrent
Circuit breaker fail
Instantaneous earth fault
Time delayed phase fault overcurrent
Time delayed earth fault/SEF
CT Supervision
High Impedance REF
Trip circuit supervision
nd
2 harmonic block/inrush restraint
Cold load pickup
Programmable logic
Autoreclose
7SR21 & 7SR22 Argus Description of Operation
Order No.
□
7 S R 2 1 0 - 1
▲ ▲ ▲ ▲
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1
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2
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3
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4
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1
□ □ □ □
A - 0 A 0
▲ ▲ ▲ ▲
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A
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B
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1
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2
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3
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4
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1
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2
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|
C
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D
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A
Chapter 1 Page 7 of 71