Siemens siprotec 7SD5 Operation & User’s Manual

Text of Siemens siprotec 7SD5 User Guide:

• Siemens siprotec 7SD5, 2 Functions 136 7SD5 Manual C53000-G1176-C169-1 3710 Dis.Loop L1-2 r OUT Distance Loop L12 selected reverse 3711 Dis.Loop L2-3 r OUT Distance Loop L23 selected reverse 3712 Dis.Loop L3-1 r OUT Distance Loop L31 selected reverse 3713 Dis.Loop L1E<-> OUT Distance Loop L1E selected non-direct. 3714 Dis.Loop L2E<-> OUT Distance Loop L2E selected non-direct. 3715 Dis.Loop L3E<-> OUT Distance Loop L3E selected non-direct. 3716 Dis.Loop L12<-> OUT Distance Loop L12 selected non-direct. 3

• Siemens siprotec 7SD5, 3.3 Commissioning 479 7SD5 Manual C53000-G1176-C169-1 Additionally, if GPS synchronization is used, check that the GPS signal is received: ap- proximately 3 seconds after startup of the processor system, the message „>GPS failure“ „OFF“ appears. 3.3.3 Checking the System Interface Prefacing Remarks If the device features a system interface and uses it to communicate with the control centre, the DIGSI ® device operation can be used to test if annunciations are transmit- ted correctly. This test option should however definitely not be used while the device is in service on a „live“ system. DANGER! Sending or receiving annunc

• A.1 Ordering Information and Accessories 587 7SD5 Manual C53000-G1176-C169-1 Voltage Transform- er Miniature Circuit Breaker (VT mcb) Nominal Values Order No. Thermal 1.6 A; magnetic 6 A 3RV1611-1AG14 External Converters Optical interfaces for Profibus and DNP 3.0 are not possible with surface mounting housings. Please order in this case a device with the appropriate electrical RS485 in- t

• Siemens siprotec 7SD5, 2 Functions 266 7SD5 Manual C53000-G1176-C169-1 Figure 2-116 Logic diagram of the high current switch on to fault protection 2.13.2 Setting Notes General A precondition for the use of the switch-onto-fault overcurrent protection function is that the configuration of the device functions (Section 2.1.1) has been configured in address 124 HS/SOTF-O/C = Enabled. At address 2401 FCT HS/SOTF-O/C it can also be switched ON or OFF. I>>> Stage The magnitude of fault current which leads to the pickup of the I>>> stage is set as I>>> in address 2404. This stage is act

• Siemens siprotec 7SD5, 2 Functions 186 7SD5 Manual C53000-G1176-C169-1 sive overreach transfer scheme even in this case, the device contains a special func- tion. The „weak-infeed function“ (echo function) is activated when a signal is received from the opposite line end — in the case of three terminal lines from at least one of the opposite line ends — without the device having detected a fault. The circuit breaker can also be tripped at the line end with no or only weak infeed. This „Weak-infeed tripping“ is referred

• Siemens siprotec 7SD5, 2 Functions 218 7SD5 Manual C53000-G1176-C169-1 tripping is initiated anyway as soon as a multi-pole fault has been detected, as de- scribed above. Figure 2-96 shows the logic diagram. The phase determined by the phase selector can be processed selectively for each phase, for example the internal information „E/F PickupL1“ etc. is used for phase-selective signal transmission. External signaling of the phase-selective pickup is accomplished via the information „E/F L1 selec.“ etc. They appear only if the phase was clearly detected. Single- pole tripping requires of course the general prerequisite

• 4 Technical Data 550 7SD5 Manual C53000-G1176-C169-1 4.9 Teleprotection for Earth Fault Protection (optional) Mode Comparison Schemes For two line ends One channel for each direction or three channels each direc- tion for phase-segregated transmission For three line ends With one channel for each direction or connection Method Dir. comp. pickup Directional unblocking scheme Direct

• Siemens siprotec 7SD5, 3.1 Mounting and Connections 467 7SD5 Manual C53000-G1176-C169-1 Figure 3-13 Example of panel flush mounting of a device (housing size 1 / 2 ) Figure 3-14 Example of panel flush mounting of a device (housing size 1 / 1 ) www . ElectricalPartManuals . com

• Siemens siprotec 7SD5, 2 Functions 324 7SD5 Manual C53000-G1176-C169-1 2936 Sync. req.CNTRL OUT Synchro-check request by control 2941 Sync. running OUT Synchronization is running 2942 Sync.Override OUT Synchro-check override/bypass 2943 Synchronism OUT Synchronism detected 2944 Usyn< U-line> OUT Sync. dead bus / live line detected 2945 Usyn> U-line< OUT Sync. live bus / dead line detected 2946 Usyn< U-line< OUT Sync. dead bus / dead line detected 2947 Sync. Udiff> OUT Sync. Voltage diff. greater than limi

• Siemens siprotec 7SD5, 2.15 Automatic Reclosure Function (optional) 293 7SD5 Manual C53000-G1176-C169-1 If none of the cycles is successful, the short-circuit protection initiates a final three-pole trip after the last permissible reclosure, following a protection stage active without auto-reclosure. The automatic reclosure is blocked dynamically (see also margin heading „Reclose Block“, above). Handling Evolving Faults When single-pole and single-and three-pole reclose cycles are executed in the net- work, particular attention must be paid to sequential faults. Sequ

• 2 Functions 250 7SD5 Manual C53000-G1176-C169-1 2.10 Weak-infeed Tripping (optional) In cases, where there is no or only weak infeed present at one line end, the distance protection does not pick up there during a short-circuit on the line. The settings and information table at „Weak Infeed“ applies for the following functions. If there is no or only a very small zero seque

• Siemens siprotec 7SD5, 2.14 Backup Time Overcurrent Protection 281 7SD5 Manual C53000-G1176-C169-1 Instantaneous tripping when the line is switched onto a fault is also possible with the I-STUB stage. Set parameter I-STUB SOTF (address 2635) to YES, if instantaneous tripping is desired. 2.14.4 Settings The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secondary nominal current of the current transformer. Addr. Parameter C Setting Options Default Setting Comments 2601 Operating Mode ON Only Emer. prot OFF ON Operating mode 2610 Iph>> 1A 0.10 .. 25.00 A; ∞ 2.00 A Iph>> Pickup 5A 0.50 .. 125.00 A; ∞ 10.00 A 2611 T Iph>>

• Siemens siprotec 7SD5, 2 Functions 256 7SD5 Manual C53000-G1176-C169-1 2.10.2.2 Setting Notes Echo Enable In applications with a transmission channel used by both the distance and the earth fault protection spurious trippings may occur, if distance protection and earth fault pro- tection create an echo independently from each other. In this case parameter Echo:1channel (address 2509) has to be set to YES. The default setting is NO. Phase Selection Phase selection is accomplished via undervoltage detection. For this purpose no ab- solute voltage threshold in volts is parameterized, but a factor (address 2510 Uphe< Factor) which is multiplied with the measured

• Siemens siprotec 7SD5, A.8 Information List 661 7SD5 Manual C53000-G1176-C169-1 3701 Distance Loop L1E selected forward (Dis.Loop L1-E f) Dis. General OUT * ON OFF * LED BO 3702 Distance Loop L2E selected forward (Dis.Loop L2-E f) Dis. General OUT * ON OFF * LED BO 3703 Distance Loop L3E selected forward (Dis.Loop L3-E f) Dis. General OUT * ON OFF * LED BO 3704 Distance Loop L12 selected forward (Dis.Loop L1-2 f) Dis. General OUT * ON OFF * LED BO 3705 Distance Loop L23 selected forward (Dis.Loop L2-3 f) Dis. General OUT * ON OFF * LED BO 3706 Distance Loop L31 selected forward (Dis.Loop L3-1 f) Dis. General OUT * ON OFF

• Siemens siprotec 7SD5, 4 Technical Data 562 7SD5 Manual C53000-G1176-C169-1 Overvoltage Zero Sequence System 3U 0 or any Single-Phase Voltage U X Phase-earth Undervoltage Phase-phase Undervoltages Tolerances Voltages 3 % of setting value or 1 V Times 1 % of setting value or 10 ms Overvoltage 3U 0 >> 1.0 V to 220.0 V; ∞ Increments 0.1 V Delay T 3U0>> 0.00 s to 100.00 s; ∞ Increments 0.01 s Overvoltage 3U 0 > 1.0 V to 220.0 V; ∞ Increments 0.1 V Delay T 3U0> 0.00 s to 100.00 s; ∞ Increments 0.01 s Drop

• 3 Mounting and Commissioning 492 7SD5 Manual C53000-G1176-C169-1 In particular with multiple busbars the trip distribution logic for the surrounding circuit breakers must be checked. Here check for every busbar section that all circuit break- ers which are connected to the same busbar section as the feeder circuit breaker under observation are tripped, and no other breakers. T

• Siemens siprotec 7SD5, 2 Functions 210 7SD5 Manual C53000-G1176-C169-1 of the earth current and a time multiplier 3I0p Time Dial (IEC characteristic, Figure 2-89) or a time multiplier TimeDial TD3I0p (ANSI characteristic). A pre-selection of the available characteristics was already carried out during the configuration of the protection functions. Furthermore, an additional fixed delay Add.T-DELAY may be selected. The characteristics are shown in the Technical Data. Fig. 2-89 shows the logic diagram. The setting addresses of the IEC characteristics are shown by way of an example. In the setting information the different s

• 4 Technical Data 534 7SD5 Manual C53000-G1176-C169-1 Delay Times Self-Restraint Inrush Restraint Conditioning for Transformers (optional) Emergency Operation Frequency Operating Range Delay of I-DIFF stage T-DELAY I-DIFF> 0.00 s to 60.00 s or ∞ (no trip) Increments 0.01 s Delay of I-DIFF stage for 1-p

• Siemens siprotec 7SD5, 2 Functions 432 7SD5 Manual C53000-G1176-C169-1 2.24.10 Min/Max Measurement Setup Minimum and maximum values are calculated by the 7SD5 and can be read out with the time reference (date and time of the last update). 2.24.10.1 Reset The minimum and maximum values can be reset, using binary inputs or by using the integrated control panel in the DIGSI ® 4 operating program. In addition, the reset can also take place cyclically, beginning with a pre-selected point in time. 2.24.10.2 Settings 2.24.10.3 Information List Addr. Parameter Setting Options Default Setting Comments 2811 MinMax cycRESET NO YES YES Automatic Cycl

• Siemens siprotec 7SD5, 2.5 Distance Protection 119 7SD5 Manual C53000-G1176-C169-1 The calculation of the phase-phase loop does not take place as long as one of the con- cerned phases is switched off (during single-pole dead time), to avoid an incorrect measurement with the undefined measured values existing during this state. A state recognition (refer to Section 2.23.1) provides the corresponding block signal. A logic block diagram of the phase-phase measuring system is shown in Figure 2-34. Figure 2-34 Logic for a phase–phase measuring unit Phase–Earth Loops For the calculation of the phase-earth loop, for example during a L3-E (Figure 2-35) it must be noted that the impedance of the earth return pa

• Siemens siprotec 7SD5, 2.15 Automatic Reclosure Function (optional) 305 7SD5 Manual C53000-G1176-C169-1 The dead times are determined by the reclosure command of the device at the line end with the defined dead times. In cases where this reclosure command does not appear, e.g. because the reclosure was in the meantime blocked at this end, the readi- ness of the local device must return to the quiescent state at some time. This takes place after the maximum wait time T-MAX ADT (address 3434). This must be long enough to include the last reclosure of the remote end. In the case of single cycle re- closure, the sum total

• Siemens siprotec 7SD5, A.4 Default Settings 615 7SD5 Manual C53000-G1176-C169-1 A.4.6 Pre-defined CFC Charts Some CFC charts are already supplied with the SIPROTEC ® device. Depending on the variant the following charts may be implemented: Device and System Logic The NEGATOR block assigns the input signal „DataStop“ directly to an output. This is not directly possible without the interconnection of this block. Figure A-22 Logical Link between Input and Output www . ElectricalPartManuals . com

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