Table Of Contents - Siemens 7SG14 Duobias-M-200 Technical Manual

Contents
1 INTRODUCTION
2 SAFETY
3 SEQUENCE OF TESTS
4 TEST EQUIPMENT REQUIRED
5 INSULATION RESISTANCE TEST
6 REF PROTECTION - CT AND SECONDARY WIRING RESISTANCE
7 RELAY POWER SUPPLY
8 PROGRAMMING THE RELAY
8.1 Setting by Laptop PC
8.2 Setting via Relay Fascia Pushbutton
9 SECONDARY INJECTION TESTS
9.1 Proving Inputs and Outputs
9.2 Accuracy of Measurement
9.3 Checking the Bias Characteristic (87BD)
9.4 Inrush Inhibit
9.5 Checking the Differential Highset (87HS)
9.6 Restricted Earth Fault (87REF)
9.7 Over Fluxing or Volts per Hertz Protection (24)
9.8 Thermal Overload (49)
9.9 Over Current and Earth Fault (51, 51N, 50, 50N, 50G, 51G)
9.10 Negative Phase Sequence Over Current (46DTL,46ITL)
10 PRIMARY INJECTION TESTS
10.1 Biased Differential Protection
10.2 Restricted Earth Fault
11 TESTS USING LOAD CURRENTS
12 PUTTING INTO SERVICE
13 SITE TEST SHEET
1 SITE TESTS
1.1 Insulation Resistance
1.2 Hardware Tests
1.2.1 Status Inputs
1.2.2 Output Relays
1.3 Secondary Injection
1.3.1 Accuracy of Measurement
1.3.2 Biased Differential Characteristics
1.3.3 Inrush Inhibit Pickup
1.3.4 Differential Highset Pickup
1.3.5 Restricted Earth Fault
1.3.6 Overfluxing
1.3.7 Thermal Overload
1.3.8 Backup Over current and Earth Fault
1.3.9 Negative Phase Sequence Over current
1.4 Primary Injection / On Load Tests
1.4.1 Differential Protection
©2010 Siemens Protection Devices Limited
7SG14 Duobias-M-200 Commissioning
Chapter 7 Page 2 of 20
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