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Related Manuals for Siemens 7SN71
Summary of Contents for Siemens 7SN71
- Page 1 Transient earth-fault relay 7SN71 Instruction Manual March 1997...
- Page 3 Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Version March 1997 Siemens AG 1997...
- Page 4 Trade marks Copyright Microsoft and MS-DOS are registered trade marks, The reproduction, transmission or use of this document Windows is a registered trade mark of Microsoft or its contents is not permitted without express written Corporation. All other brand or product names may be authority.
- Page 5 Warning be referred to the local Siemens sales office. Dangerous voltages may occur in cer qualified person is one who is familiar with the...
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Page 7: Table Of Contents
............A - 1 A.1.1 Connection diagram of the 7SN71 (panel surface mounting with AC power supply unit) . . . A - 1 A.1.2... - Page 8 ............. . . 5 - 3 Figure A.5.4 Connection diagram of the 7SN71 (panel surface mounting with AC power supply unit) . . .
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Page 9: Application
Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Application Earth fault directional determination The highly sensitive tansient earth-fault relay 7SN71 This charging process is bound up with a strong cur determines the direction of transient and continuous rent surge (starting oscillation). earth faults in systems with isolated neutral, in sy... -
Page 10: Figure 1.2 Direction Of The Displacement Voltage And The Earth Current (Earth-Fault Isolates At T1)
Application Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 At measuring point A, as a result of the transformer The displacement voltage V thereupon also returns summation circuit, the earth current of the faulted line to zero. In earthed systems this takes place after a... -
Page 11: Figure 1.3 Detection Of Fault Location
Application Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 red LED forwards direction" yellow LED reverse direction" no indication Figure 1.3 Detection of fault location 1 - 3 Siemens AG March 1997... -
Page 12: Functions And Features
Application Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Functions and features D Device versions for panel surface mounting or D Optional suppression of switching operations flush mounting D Connection to 230 V AC D Bidirectional measurement, indication and signal... -
Page 13: Method Of Operation
Method of operation Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Method of operation Current and voltage input (see figure 2.1) The summation current of the cable-type CT or of the In order to prevent incorrect signalling during swit... -
Page 14: Figure 2.1 Current And Voltage Input
Method of operation Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Reset = 1 A I> = 5 A I> & V> "Release" & V> Continous earth fault V> 0...70 ms 2...0 s Figure 2.1 Current and voltage input... -
Page 15: Evaluating Logic (See Figure 2.2)
Method of operation Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Evaluating logic (see figure 2.2) Once the set current and voltage memories have LED is also activated , once the signals for directio been released and evaluated , the memories for... -
Page 16: Suppression Of Switching Operations
Method of operation Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Suppression of switching operations The front plug t " is used to enable or disable the If the front plug t " is inserted, switching operations delay time for control of the displacement voltage in isolated systems are not indicated or signalled. -
Page 17: Operating Instructions
Operating instructions Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Operating instructions Safety precuations All safety precautions which apply for work in electri cal installations are to be observed during commissio ning. Connection to auxiliary power supply Figure 3.1 shows the connection to a current transfor nected to terminal 3 (1B1). -
Page 18: Figure 3.2 Connection To The Auxiliary Power Supply
Operating instructions Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Connection to auxiliary power supply Connection is either made to the 230 V AC mains or between two phases (100 V) of the v.t.s. Connection to the station battery is also possible (see figure 3.2). -
Page 19: Settings
Test equipment 7VP83 serves to test the transient the test object ic connected to test equipment 7VP83 earth-fault relay 7TH2300-0 / 7SN70 and 7SN71. as shown in figure 3.3. The test equipment operates at 230 V AC. Test current I... -
Page 20: Earth-Fault Direction Signal
If the pushbutton is pressed to reverse" (>100 ms), the yellow "LED " of 7SN71 must light up. In ad 3.5.4 Continuous earth-fault signal dition, the reverse" signal (relay contact) must be released. -
Page 21: Technical Data
Technical Data Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Technical Data Table 4.1 Technical Data Measuring circuit Rated voltage V 100/110 V AC Rated current I 1 or 5 A Rated frequency f 50 Hz Thermal rating in current path, continuous... -
Page 22: Ordering Code / Mflb
Technical Data Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Ordering code / MFLB Table 4.2 Selection and ordering data Order number Transient earth-fault relay 7SN71 7SN7100 - j j A 0 0 Auxiliary voltage V 100 to 110/230 V AC, 50 Hz... -
Page 23: Housing Types And Dimensions
Housing types and dimensions Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Housing types and dimensions Panel flush mounting 29.5 Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç... -
Page 24: Panel Surface Mounting
Housing types and dimensions Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Panel surface mounting 29.5 Diam. 9 Cutout 20 x 60 (without paint) 1) Resetter 2) Earthing screw 3) Surface terminal C73165-A63-B333 4) Surface terminal C73165-A63-B334 5) Housing 7XP20***... -
Page 25: Front View Of Relay
Housing types and dimensions Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Front view of relay SIEMENS Direction Forwards" (red LED) Latch Reverse" (yellow LED) Operation indicator Continuous earth fault (green LED) (red LED) Betr./Run Pick-up sensitivity settable via coding... - Page 26 Housing types and dimensions Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 5 - 4 Siemens AG March 1997...
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Page 27: Connection Diagrams
Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Connection diagrams A.1.1 Connection diagram of the 7SN71 (panel surface mounting with AC power supply unit) See figure A.5.4 on page A - 2. A.1.2 Connection diagram of the 7SN71 (panel surface mounting with DC power supply unit) See figure A.5.5 on page A - 3. -
Page 28: Figure A.5.4 Connection Diagram Of The 7Sn71 (Panel Surface Mounting With Ac Power Supply Unit)
Appendix Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Figure A.5.4 Connection diagram of the 7SN71 (panel surface mounting with AC power supply unit) A - 2 Siemens AG March 1997... -
Page 29: Figure A.5.5 Connection Diagram Of The 7Sn71 (Panel Surface Mounting With Dc Power Supply Unit)
Appendix Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Figure A.5.5 Connection diagram of the 7SN71 (panel surface mounting with DC power supply unit) A - 3 Siemens AG March 1997... - Page 30 Appendix Transient earth-fault relay 7SN71 Instruction Manual Order No.: E50410-A0007-U501-A1-7691 A - 4 Siemens AG March 1997...
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Page 31: Index
INDEX Transient earth-fault relay 7SN71 - Instruction Manual Order No.: E50410-A0007-U501-A1-7691 Application, 1 - 1 Panel flush mounting, 5 - 1 Panel suface mounting, 5 - 2 Connection diagrams, A - 1 Connection to auxiliary power supply, 3 - 1, 3 - 2... - Page 32 INDEX Transient earth-fault relay 7SN71 - Instruction Manual Order No.: E50410-A0007-U501-A1-7691 X - II Siemens AG March 1997...
- Page 33 Telephone no. Suggestions Corrections for document order no. version Transient earth-fault relay 7SN71 E50410-A0007-U501-A1-7691 March 1997 Instruction manual...
- Page 36 Siemens AG, EV S, Power Substation Control and Power System Protection PO Box 48 06 Transmission D-90026 Nuremberg and Distribution Federal Republic of Germany Order No.: E50410-A0007-U501-A1-7691 Siemens Aktiengesellschaft Printed in Germany...