Specifications

7SR242 Duobias Description Of Operation
©2010 Siemens Protection Devices Limited Chapter 1 Page 7 of 52
Table 1-1: 7SR242 Ordering Options
DUOBIAS-M 7 S R 2 4 2  -2 A ƒ 1-0ƒ A0
Ź    
Multifunctional 2 winding ||| || || ||
transformer differential Protection Product ||| || || ||
protection Transformer 4 || || || ||
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Relay Type || || || ||
Differential (2 winding) 2 ||||| ||
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Case I/O and Fascia ||||| ||
E8 case, 6 CT, 2 EF/REF CT, 1 VT, 9 Binary Inputs / 6 Binary Outputs,
16 LEDs
2
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E10 case, 6 CT, 2 EF/REF CT, 1 VT, 19 Binary Inputs / 14 Binary Outputs,
24 LEDs
3
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Measuring Input || || ||
1/5 A, 63.5/110V, 50/60Hz 2 ||| ||
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Auxiliary voltage ||| ||
30 to 220V DC, binary input threshold 19V DC A || ||
30 to 220V DC, binary input threshold 88V DC B || ||
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Communication Interface || ||
Standard version – included in all models, USB front port, RS485 rear port 1 |||
Standard version – plus additional rear F/O ST connectors (x2) and IRIG-B 2 |||
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Protocol |||
IEC 60870-5-103 and Modbus RTU (user selectable setting) 1 ||
IEC 60870-5-103 and Modbus RTU and DNP 3.0 (user selectable) 2 ||
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Protection Function Packages ||
Option A: Standard version – Included in all models
- 81HBL2 Inrush Detector
- 81HBL5 Overfluxing detector
- 87BD Biased current differential
- 87HS Current differential highest
Programmable logic
For each winding/circuit breaker
- 50BF Circuit breaker fail
- 64H High impedance REF
- 74TCS/CCS Trip/close circuit supervision
Option B
: Standard version – plus
- 37 Undercurrent
- 46BC Open circuit
- 46NPS Negative phase sequence overcurrent
- 49 Thermal overload
- 50 Instantaneous phase fault overcurrent
- 50G/50N Instantaneous earth fault
- 51 Time delayed phase fault overcurrent
- 51G/51N Time delayed earth fault
A
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B
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(continued on following page )