Presentation is loading. Please wait.

Presentation is loading. Please wait.

Siemens Protection and Substation Control EV S 1 Numerical Pilot Protection 7SD52 using digital wide-band communication.

Similar presentations


Presentation on theme: "Siemens Protection and Substation Control EV S 1 Numerical Pilot Protection 7SD52 using digital wide-band communication."— Presentation transcript:

1 Siemens Protection and Substation Control EV S 1 Numerical Pilot Protection 7SD52 using digital wide-band communication

2 Siemens Protection and Substation Control EV S 2 Numerical pilot protection relay 7SD52 Universally applicable to power system configurations up to six ends, containing:  OH-Lines  Cables  Transformers For digital data transmissen  Via dedicated optical fibres  Via Communication networks

3 Siemens Protection and Substation Control EV S 3 Numerical Pilot Differential Protection Principle Operate : I D =  I A + I B  Bias: I B =  I A + I B  Operating Criterium: I D  K 1 + K 2. I S operate stabilize IDID IBIB II IAIA IBIB II I AS, I AC I BS, I BC +j I AC IAIA IDID IBIB I BC I BS I AS + I A = I AS + j I AC I B = I BS + j I BC

4 Siemens Protection and Substation Control EV S 4 Definition of Synchronous Phasor: measured at different locations based on a common time reference

5 Siemens Protection and Substation Control EV S 5 k-n n i k Numerical pilot protection: Advanced Fourier analysis of the currents - Supress DC components, harmonics

6 Siemens Protection and Substation Control EV S 6 Advanced Fourier Transformation - Optimized filtering coeffizients for 7SD52 -> Suppress DC 4 times better than conventional Fourier-filters -> Archieve high sensitivity tt i0i0 i1i1 i2i2 iNiN n 012N 012N

7 Siemens Protection and Substation Control EV S 7 Advanced Full Cycle Fourier analysis: Filter characteristic

8 Siemens Protection and Substation Control EV S 8 Orthogonal Current Components (Advanced Fourier Filter) tt I (  t)  = 0 j I C I ISIS t = 0 tt

9 Siemens Protection and Substation Control EV S 9 t L2 t L1 tVtV t A1 t A2 t A3 t A4 t A5 t B1 t B2 t B3 t B4 II AB Propagation time: t L1 = t L2 = 1/2 x (t A-reception - t A1 - t V ) Corrected sampling instant: t B3 = t A-reception -t L2  I B (t B3 ) I B (t A3 )  = (t B3 - t L2 ) x (360 O /T period )... I S(A), I C(A) t A1 t B3 t A1 tVtV I S(B), I C(B).... II Numerical Pilot Differential Relay Propagation Time Measurement and Phasor Angle Correction

10 Siemens Protection and Substation Control EV S 10 Example for the delay time calculation Flight from Berlin New York You can not calculate the duration of a flight if you look at the clock in Berlin on departure and later note the local New York time on arrival. The reason are the different time zones. The relays are also in two time zones.. Each relay has it´s own 1 us resolution timer. Tdepart / B->NY (6:00) > Tarrival / B->NY (8:00) From the flight back from New York to Berlin the local departure time in NY and the arrival time in Berlin is: T arrival / NY->B (23:00) B (9:00) Under the assumption, that the flight to New York and the flight back from NY have the same duration the relevant time results can be calculated. The time difference between NY and B and the duration of the flight (transmission time) Duration = ( T arrival / B->NY - T depart / B->NY+ T arrival / NY->B - Tdepart / NY->B ) / 2 Time difference = (Tdepart / B->NY - Tarrival / B->NY + Tarrival / NY->B - Tdepart / NY->B ) / 2 Duration = (8:00 - 6: :00 - 9:00) / 2 = 8 hours (-> delay time) Time diff. = (6 Uhr - 8 Uhr + 23 Uhr - 9 Uhr)/2 = 6 hours (-> difference between the time zones) Time diff. = (6 Uhr - 8 Uhr + 23 Uhr - 9 Uhr)/2 = 6 hours (-> difference between the time zones)

11 Siemens Protection and Substation Control EV S 11 HDLC FRAME FORMAT bits relays address 8 or 16 bits any length 0 - N bits 32 bits Opening Flag Address Field (A) Control Field (C) Information Field (I) Frame Check Seqence (FCS) Closing Flag time data status + command Current vectors message validation Synchronizing Coded message of current differential protection 7SD52

12 Siemens Protection and Substation Control EV S 12 II II Monomode fibre 1300 ober 1550 nm a) Dedicated optic fibre II II PCM MUX Optic fibre or microwave Wire G.703 O.F. G.703 O.F. G.703 Multimode optic fibres 850 nm Multimode optic fibres 850 nm b) Channel of a data transmission system or of a data transmission network (Protection and PCM-device in the same room) Further services: Telefon, Data transmission, etc. II II PCM MUX Optic fibre or Microwave Wire, G.703 Further services: Telefon, Data transmission, etc. Further services: Telefon, Data transmission, etc. Further services: Telefon, Data transmission, etc. b) Channel of a data transmission system, or of a data transmission network (Protection and PCM-device not in the same room) Numerical pilot differential protection: Communication options

13 Siemens Protection and Substation Control EV S 13 Application for a three terminal configuration SDH comms-network X21 G nm max. 3 km e o PCM multi- plexer Monomode fibre optic cable up to 35 km with 1300 nm interface Distance relay 7SA52 Monomode fibre optic cable up to 10 km (1300 nm modul) PCM multi- plexer o e o e Comms- converter G703.1: 64 kBit X21: N*64 kBit (1  N  8) Option: I-REGB time synchronisation

14 Siemens Protection and Substation Control EV S 14 Scope of functions / Hardware options - For system configurations with up to 6 terminals - Fast high set charge comparision (subcycle trip) - Sensitive current phasor differential - Inrush restraint (2nd harmonic) and vector group adaption - CT saturation detector - Autoreclosure 1/3 pole - Overload protection - Switch on to fault protection - 4 remote commands, 24 remote signals ½*19´´ 1*19´´ 16 binary inputs 24 contacts 24 binary inputs 32 contacts Option: 5 fast trip contacts 3I ph, and I E 4 U 8 binary inputs 16 contacts protection interfaces System interface PC-interface Time synchronisation Numerical line differential protection 7SD52

15 Siemens Protection and Substation Control EV S 15 Communication Options FO5: distance 1,5 km (with clock feed-back) FO6 : distance 3km O O 1300 nm 10 km O 1300 nm 35 km O E X21G703 internal external 820 nm 1,5 km / 3 km FO7 : distance 10km FO8: distance 35km KU : hook-up to communication network Km data for worst-case conditions

16 Siemens Protection and Substation Control EV S 16 Hardware option of the comms interfaces Protection interface 2 Port E Synchronous N x 64kB/sec 7SD52 Protection interface 1 Port D Synchronous N x 64kB/sec Serial time sync. input GPS-receiver Interfacemodul 1 RS485 or FO or RS232 service-interface DIGSI 4; also for modem connection and Browser local-PC interface DIGSI local Browser Substation control communication modules FO (Fibre optic) or RS485 or RS232 Available Protocols IEC - standard Interfacemodul 2 RS485 or FO Subst. control interface Plug in modules Remote line end 2 Remote line end 1

17 Siemens Protection and Substation Control EV S 17 Main processor board of the relay Sockets for the communication modules Main board of the relay with it´s Communication - Interfaces

18 Siemens Protection and Substation Control EV S 18 87L 1 cycle Phasor, fundamental frequency Every 5ms ( bBit), 10 ms (64 kBit) Adaptive Algorithm: Fast Charge comparison and very sensitive Phasor differential Charge comparison Fast normal trip stage I Diff>> Setting: 0,67*I Loadmax /I N Fast, <1cycle Phasor differential For high resistive faults I Diff> Setting: 0,1-0,2 I N

19 Siemens Protection and Substation Control EV S 19 I Diff = I 1 + I 2 + I 3 Calculated Phasor sum: I Restrain =  c.t. tolerance +  Syncronising tolerance trip condition:  trip condition: I Diff >I low set and I Diff > I Restraint Restrain: I Diff I N,load. I restr I N,Betr. I1I1 I2I2 I3I3 I Diff> I1I1 I2I2 I3I3 I1I1 0.5 restrain trip 0,15 load Through fault Adaptive differential relaying Consideration of CT- and communication-errors Minimum pick-up: I Diff = I low set

20 Siemens Protection and Substation Control EV S 20 Spill Current through Line Charging Capacitances Source V 1 Kichhoff equation: I 1 + I 2 - I Diff - I C = 0 Service conditions: I Diff = 0, I C = I 1 + I 2  Difference equals charging current Pick-up value:I Diff> >2,5.. 4 I C  sensitive set point at short lines, minimum 0,1 I N I1I1 I2I2 C.t.2 I Diff C.t. 1 Protected Zone defined by c.t.1 and c.t.2 ICIC I1I1 Source V 2

21 Siemens Protection and Substation Control EV S 21 Setting above spill currents: c.t. error and line charging I Diff = |- I 1 ´ + I 2 ´| = f 1 I 1 + f 2 I 2 Load: I 1 = I N I Diff =0,1 I 1 = 0,1 I N Through Fault: I 1 = 10 I N I Diff = 10,5 I N - 9,5 I N = I N I Diff> set point > line charging current Percentage bias > Sum of c.t. errors I 1 ´=0,95I 1 I 2 ´=1,05I 1 I Diff =0,1 I 1 -I 1 I1I1 I Diff Minimum pick-up related to line charging current I1I1 Percentage bias related to c.t. errors Resulting set point I Diff> Set points :

22 Siemens Protection and Substation Control EV S 22 Approximated c.t. Tolerance Basis for the restraint current calculation ALF e / ALF N I N,c.t : parameter 7SD52 I Diff I1I1 I1I1 Example: 10P10, f B < 3%, f K at ALF N = 10% Fault current tolerance Load current tolerance Tolerance of a real CT

23 Siemens Protection and Substation Control EV S 23 Current transformer data c.t. e.g. 5P20, 10VA % tolerance at ALF N Thumb rule: R i  0,1...0,2 * R N R N at 10 VA  10  => R i  2  ALF e = ALF N P i + P N P i + P B With P B = P leads + P relay (  0,1 VA) = 2 VA + 10 VA 2 VA + 1 VA = 4 Resulting Relay Parameter: effective ALF / nominal ALF = 4 (calculation as per above) IEC 44 -1: tolerance in load area up to ALF e / ALF N : 1% with 5P, 3% with 10P c.t.s total error at accuracy limit n N = 5% with class, 5P and 10% 10 P ALF e ALF N C.t. Parameter

24 Siemens Protection and Substation Control EV S 24 Internal restraint current calculation due to CT-errors 10P10 10 VA 400:1 ALFe/ALF N = 1 f Load 3 = 3% (0,03) f SC 3 = 10% (0,1) 5P20 20 VA 1600:1 ALF e /ALF N = 5 f Load 1 = 1% (0,01) f SC 1 = 5% (0,05) 5P20 20 VA 1600:1 ALFe/ALF N = 2 f Load 2 = 1% (0,01) f SC 2 = 5% (0,05) I C = 100 A 800 A 4800 A 400 A 800 A 1200 A 5600 A I Stab = 2.5 line charge currents (basic restraint value) +  c.t. error currents I Diff = actual deviation of vector summation and charge summation Case 1 (Through load) I Rest = 2,5 100 A A 0, A 0, A 0,03 = 282 A I restr / I N,load = 0,176 Idiff = 100 A I Diff / I N,load = 0,063 Case 2 (Through fault) I Rest = 2,5 100 A A 0, A 0, A 0,1 = 658 A I restrain / I N,load = 0,41 I Diff = 40 A I Diff / I N,load = 0,025 I N,load = 1600 A The restraint current is the sum of the maximal expected CT-errors

25 Siemens Protection and Substation Control EV S 25 Harmonic order Harmonic content of the differential current |f n | |f 1 | 0 0 t t ct I 2 ct I 1 I d = I 1 - I 2 CT Saturation detector based on harmonic analysis

26 Siemens Protection and Substation Control EV S 26 Charge comparison: Operating Principle protected Line configuration 7SD52 I 1 I 2 I 3 Q part 2 =Q 2 +Q 3 4 I 4 Q part 3 =Q 3 +Q 4 Q part 4 =Q 4 Q 3 =Q 1 +Q 2 3 Q part 2 =Q 1 +Q 2 Q part 1 =Q Q diff =Q 1 +Q  Q diff Q 2 Q 1 Q 3 Q 4

27 Siemens Protection and Substation Control EV S 27 Charge Comparison: Charge calculation, Operating characteristic, Tripping times Charge calculation by numerical integration Current Measuring window 1 Q t 0 t 1 t 2 t 3 t 4 t 5 t 6 |Q diff | Operate (internal fault) Q DIFF > Settable pick-up value qdiff12.dsf slope depending on  Q diff 5 ms (50 Hz) Corrected time instants after end-to-end time synchronisation Relay calculates the charge. Setting as current value I Diff>> Calculated charge restraint value from CT-errors, synch. errors Q Rest =I Diff>> Restraint Area

28 Siemens Protection and Substation Control EV S 28 7SD52 Pilot Protection: Sliding data windows current, voltage fault- inception time voltage current 5 ms charge and 20 ms phasor data windows

29 Siemens Protection and Substation Control EV S 29 Synchronous data transmission by HDLC- protocol Permanent supervision of the data transmission Measurement and compensation of signal transmission time (max. 20 ms) Counts number of invalid telegrams Blocking the diff.protection if transmission failure rate is too high Settings for the data transmission (N*64 kBit/s, N settable from 1 - 8, synchronous HDLC-protocol) Communication device addresses (Protection devices are clearly assigned to a defined protection section) Detection of reflected data in the loops in comms- network Step 2: Microsecond exact time synchronisation via satellite (civil - IRIG-B) (If signal transmission time depends on the transmission direction, Online high resolution fault recorder) Familiar with digital communication networks Features of the relay to relay communication

30 Siemens Protection and Substation Control EV S 30 Ring and Chain topologie Closed ringPartial current summation I3I3 I2I2 I1I1 side 1 side 2 side 3 I3I3 I2I2 I1I1 side 1 side 2 side 3 I3+I1I3+I1 I2I2 I1+I2I1+I2 I3I3 I3+I1I3+I1 I1+I2I1+I2 Connection to other diff. relays Automatic change from closed ring to chain, if one connection is lost or not available

31 Siemens Protection and Substation Control EV S 31 Breaker-and-a-half Scheme, Through Fault Stabilisation busbar 2 busbar 1 I f = through fault current 87L To remote end busbar 2 busbar 1 I f = through fault current 87L To remote end 87L Partial differentialFull differential

32 Siemens Protection and Substation Control EV S 32 Topologies: Chain topology for max. 6 line ends PI - Protection Interface PI1 PI2PI1 PI2 PI1 PI2PI1PI2PI1

33 Siemens Protection and Substation Control EV S 33 Topologies: Ring topology, 6 line ends PI1 PI2 PI1 PI2PI1PI2PI1 PI2 PI1 PI2PI1PI2 PI - Protection Interface

34 Siemens Protection and Substation Control EV S 34 Web-Browser based commissioning tool

35 Siemens Protection and Substation Control EV S 35 7SD52: Commisioning and Monitoring using Web-Browser


Download ppt "Siemens Protection and Substation Control EV S 1 Numerical Pilot Protection 7SD52 using digital wide-band communication."

Similar presentations


Ads by Google