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12. FIGURES

GEK-106243E

DTP Digital Transformer Protection

12-5

Figure 5: Front View

Summary of Contents for DTP-B

Page 1: ...mail gemultilin ge com Internet www GEMultilin com Copyright 2005 GE Multilin DTP B Digital Transformer Protection Instruction manual GEK 106243E GE Multilin Avda Pinoa 10 48170 Zamudio SPAIN Tel 34 94 485 88 00 Fax 34 94 485 88 45 E mail gemultilin euro ge com g GE Consumer Industrial Multilin ...

Page 2: ...RAINT SETTING K2 FIGURE 9 2 10 2 3 5 CT CONFIGURATION SETTING 2 10 3 OPERATING PRINCIPLES 3 1 3 1 DESCRIPTION OF THE GENERAL OPERATING PRINCIPLE 3 1 3 2 MEASUREMENT ALGORITHMS 3 2 3 2 1 DIFFERENTIAL CURRENT 3 2 3 2 2 THROUGH CURRENT 3 3 3 2 3 HARMONIC RESTRAINT 3 3 3 2 4 INTERNAL PHASE SHIFT MATCHING 3 3 3 3 INTERNAL STATES 3 4 4 FUNCTIONS DESCRIPTION 4 1 4 1 PROTECTION FUNCTIONS 4 1 4 2 MONITORIN...

Page 3: ...ON 8 2 8 1 4 IDENTIFICATION 8 3 8 1 5 MAGNETIC MODULE 8 3 8 1 6 PROTECTION CPU PROCESSING BOARD 8 4 8 1 7 COMMUNICATIONS CPU MODULE 8 4 8 1 8 INPUTS OUTPUTS MODULE 8 4 8 1 9 POWER SUPPLY 8 5 8 1 10SAMPLE HOLD MODULE 8 5 8 2 RECEPTION HANDLING STORAGE 8 6 8 3 INSTALLATION 8 6 9 ACCEPTANCE TESTS 9 1 9 1 CONNECTIONS 9 1 9 2 VISUAL INSPECTION 9 1 9 3 INSULATION TESTS 9 1 9 4 POWER SUPPLY 9 2 9 5 MEASU...

Page 4: ...3 INSTANTANEOUS FUNCTION CHECKING 9 6 10 INSTALLATION AND MAINTENANCE 10 1 10 1 INSTALLATION 10 1 10 2 CONNECTION TO GROUND AND SUPPRESSION OF DISTURBANCES 10 1 10 3 MAINTENANCE 10 1 11 KEYBOARD AND DISPLAY 11 1 11 1 MENU TREE 11 2 11 2 SETTINGS GROUP 11 4 11 3 INFORMATION GROUP 11 8 11 4 OPERATIONS GROUP 11 10 11 5 SINGLE KEY OPERATION 11 11 11 6 CONFIGURATION MENU 11 12 12 FIGURES 12 1 ...

Page 5: ...n to all tables Table IV Independent Settings for each table LIST OF FIGURES Fig 1 External connections Fig 2 Panel drilling dimensions Fig 3 RS 232 Connection Fig 4 Dimensions diagram Fig 5 Front view Fig 6 Sample transformer for the calculation of settings Fig 7 Operating principles of the differential protection Fig 8 Block diagram of the protection Fig 9 Percentage Characteristic ...

Page 6: ...t provides differential 87 and backup instantaneous 87B three phase protection functions for power transformers Different models of the DTP are available for protecting and monitoring transformers with two three or four windings This equipment incorporates the following functions a Protection Totally digital three phase differential protection 87 with percentage restraint and harmonic restraint se...

Page 7: ...RS232 RS485 glass or plastic fiber optics The following software is associated to the DTP GE LOCAL Communications Software allowing the user to monitor and modify the protection settings alarms internal status etc GE INTRO Configuration Software used for the configuration of inputs outputs alarms and LED indicators GE OSC Oscillography Software for monitoring and analyzing oscillography records Th...

Page 8: ...ransformer on a self cooled basis must not exceed the relay tap value selected Otherwise magnetizing inrush current might operate the backup instantaneous function 87B If the power transformer does not have a self cooled rating the user should contact the manufacturer for the equivalent self cooled rating The DTP relay s backup instantaneous function 87B can be set to operate for differential curr...

Page 9: ...avy through fault current flowing around the ring bus Protecting two parallel transformer banks with one DTP relay is not recommended since the sensitivity will be reduced Additionally if the two banks can be switched independently there is a possibility of false operation when the inrush current of one transformer bank provokes a sympathetic inrush current into the bank already energized In this ...

Page 10: ... winding determine the rated line current 100 Ip based on the full self cooled kVA rating or the equivalent self cooled rating of the power transformer 100 transformer kVA 100 Ip 3 x kV LL These calculations do not necessarily mean that each winding is going to carry these currents continuously This is only a convenient way of calculating the currents in the other windings in proportion to their v...

Page 11: ...y control cable lead resistance at 75ºC The multiplying factors associated with f and R account for two cable leads instead of one resistance value increase due to temperature rise and the resistance of the longest CT leads Determine the CT secondary current for 8 times the tap value Is 8 x relay tap Note For the assumed fault all of the fault current is supplied by one CT Consequently the CT curr...

Page 12: ... RESTRAINT SETTING The appropriate percentage restraint K1 is determined by the sum of The maximum range of the tap changer in percent The maximum mismatch error of the relay taps in percent In general if the total error does not exceed 20 use a restraint of 25 Since the DTP relay s percentage restraint can be adjusted in steps of 0 1 a very precise setting can be selected The second characteristi...

Page 13: ...Ratio 20 20 40 5 Isec max less than 5 A 1 10 2 19 2 19 6 100 Isec 0 87 1 75 1 75 7 CT Connections wye wye wye 8 Relay currents for 100 Isec 0 87 1 75 1 75 Select a relay tap for one of the windings A B or C and calculate the ideal relay taps for the other windings using Relay current in next winding Ideal tap x selected relay tap Relay current in selected winding 9 Ideal relay taps select A 2 5 2 ...

Page 14: ...e unbalance will always be covered by the percentage restraint setting although it is not recommended to have errors over 20 including the variation due to the possible tap changer of the transformer Nevertheless the DTP relay has a high tap range in 0 01 In steps so that there will always be available taps very close or exact to the current values reaching minimum errors NOTE 1 For this example a...

Page 15: ... 20 x 4 1 2 5 x 25 Z 0 04 2 27 x 0 25 0 75 1000 Winding C 40 x 2 6 2 5 x 25 Z 0 04 2 27 x 0 25 0 77 1000 2 Impedance ohms 0 75 0 75 0 77 3 Current I at 8 times the tap value A 20 0 40 0 40 0 4 Required Es Is xZ for the CT 15 0 30 0 30 0 5 Required exciting current Ie from the excitation curve 0 87A 100A 0 26A 6 Ration error in 4 35 100 1 08 The excitation current in winding B is excessive therefor...

Page 16: ... 2 97 4 0 6 Actual taps 3 0 3 0 4 0 7 Check that the mismatch errors are 0 AB 1 01 BC and 1 01 CA 2 3 2 2 CT Ratio Error A B C 1 Impedance ohms 0 75 0 75 0 77 2 Current at 8 times the tap value 24 24 32 3 Required Es for CT 18 18 24 64 4 Required Ie 1 0 2 0 1 5 Ratio error in 4 16 0 83 0 31 All errors are less than 20 therefore the CT ratios are OK 2 3 3 PERCENTAGE RESTRAINT SETTING K1 FIGURE 9 Ma...

Page 17: ...d emergency overload level momentaneous The Percentage Restraint Setting K2 can be set to the same value as K1 or to a higher value depending on the previsions of possible CT saturations 2 3 5 CT CONFIGURATION SETTING Taking into consideration that the polarity signals P1 are on the busbar side in all windings 1 A Current Transformer will have Wye Wye Zero configuration Yy when its secondary termi...

Page 18: ...ck diagram of the relay The operation of the DTP relay is described by the following equation Gd I1 I2 f Gf I1 I2 f h Ga I1 I2 h S 0 For a three phase transformer with two windings the relay contains two current transformers per phase one on each side of the transformer From these currents the differential current and the through current are calculated Additionally each phase current is filtered w...

Page 19: ...ations Self checking Possibility to include oscillography Possibility of hourly clock set Expanded setting ranges for taps instantaneous levels sensitivity harmonics and percentage restraint such this relay can be applied to any type of transformer Low burden Permits the inclusion of non linear algorithms which avoid undesired trips in some situations especially during inrush with or without load ...

Page 20: ...ng guarantees an accurate measurement and complies with the Nyquist criteria The total harmonic restraint is the RMS value This RMS value is equal to the square root of the sum of the squares of the second and fifth harmonics Ih I2 A2 I5 A5 Where Ih Total harmonic restraint current I2 Second harmonic current A2 Second harmonic percentage restraint I5 Fifth harmonic current A5 Fifth harmonic percen...

Page 21: ...he value 1 and it can be taken to an output contact an alarm or a LED indicator In the same way if a digital input activates its internal state becomes 1 and it can also be taken to an output input event or LED AND OR and NOT gates logics can also be performed with the internal states for example activating an output when a unit s pickup conditions exist and activating an input blocking the units ...

Page 22: ... change Out of service AND3 External trigger Default general settings AND4 Communications trigger Default table 1 settings AND5 Input 7 Default table 2 settings AND6 Input 6 Default table 3 settings AND7 Input 5 Tripping not permitted AND8 Input 4 Buchholz Alarm AND9 Input 3 Temperature Alarm AND10 Input 2 Tripping Contact AND11 Input 1 Active Table 1 AND12 87B A Trip Active Table 2 AND13 87B B Tr...

Page 23: ...3 OPERATING PRINCIPLES 3 6 DTP B Digital Transformer Protection GEK 106243E ...

Page 24: ...ts take as reference phase A 0º of the transformer s primary winding Therefore this phase must be present so that the measurements of the arguments are coherent 4 2 2 LED INDICATORS An internal states matrix stores the digital information for all the units inputs pickups alarms etc The digital signals on this matrix are grouped in groups of 16 signals up to a total of 10 groups the final group cor...

Page 25: ...ernal communication f il 8 Buchholz Trip 16 Remote mode 4 2 3 SELF CHECKING FUNCTIONS As an advantage of its digital technology the DTP system incorporates self checking functions which guarantee the correct performance of the unit and will block the operation in case of internal errors These self monitoring checks are carried out both when the unit is started up and during normal operation The ch...

Page 26: ... includes the following information Instantaneous values for current inputs IA IB IC Digital information Status of protection functions Date and time Causes that generated the oscillographic register Active settings in the moment of the register The causes that can generate the oscillography trigger are the following 87B phase A Trip 87B phase B Trip 87B phase C Trip 87 phase A Trip 87 phase B Tri...

Page 27: ...gs table in each moment There is also a way to change the settings table using up to 2 digital inputs called TABLE 0 SELECTION AND TABLE 1 SELECTION These allow up to 4 different combinations from 0 to 3 In order to operate this way the inputs must be configured to perform the settings table change For applications requiring fewer tables up to 2 only one input needs to be used The selected combina...

Page 28: ...ops 4 5 2 OUTPUTS The DTP has 13 outputs as follows 4 trip 1 alarm 8 configurable outputs The technical characteristics of the outputs are explained in section 6 The configurable outputs can be programmed using a logic based on the internal protection states pick ups trips alarms etc The internal states of the DTP can be used to carry out logical operations NOT AND and OR This gives a great flexib...

Page 29: ...nt and the unit can serve them simultaneously The communications protocol MLINK is the same as that used for the rest of the DDS System GE Digital Protections and requires the use of the GE LOCAL software The protocol is reliable and allows communication with different protection systems It guarantees very efficient data transfer especially for the oscillography and other large files along with er...

Page 30: ...ically the parameters for the communication configuration of the local MMI are the following UNIT NUMBER PASSWORD COMMUNICATION BAUD RATE for the relay depending on which port is being used local or remote STOP BIT for the relay depending on which port is being used local or remote To modify or view the unit s configuration parameters go to the configuration menu and follow the instructions given ...

Page 31: ...ding tap 0 5 20 x In 1 0 01 4th winding tap 0 5 20 x In 1 0 01 1st winding configuration Y D ZZ Y N A 2nd winding configuration Y D ZZ Y N A 2nd winding time group 0 11 0 1 3rd winding configuration Y D ZZ Y N A 3rd winding time group 0 11 0 1 4th winding configuration Y D ZZ Y N A 4th winding time group 0 11 0 1 1st winding CT configuration Y0 Y6 D1 D5 D7 D11 Y0 N A 2 nd winding CT configuration ...

Page 32: ...abled Enabled N A CommunicationTrigger Enabled Disabled Enabled N A Function Permission Group 87B Function permission Allowed Not allowed Not allowed N A 87 Function permission Allowed Not allowed Not allowed N A 2nd harmonic restraint Allowed Not allowed Not allowed N A 5th harmonic restraint Allowed Not allowed Not allowed N A Trip 87B Enabled Disabled Enabled N A Trip 87 Enabled Disabled Enable...

Page 33: ... active at a given moment This selection can also be carried out by digital inputs configured for this purpose If there is a disagreement between this setting and the input selection the last one has priority over the table selection via setting The PREFAULT CYCLES setting is the number of cycles before the oscillography trigger to be registered by the system between 2 and 10 cycles In any case th...

Page 34: ...e of each input is detailed in the following paragraphs External Trigger P This input is activated by pulse and the relay captures the oscillography on activation It also generates an event Table 0 Selection L This input is activated by level and it is used for changing the active settings table Please refer to section 4 4 for further details Table 1 Selection L Same as the previous one Buchholz A...

Page 35: ... this same screen we configure AND3 as the logic AND for AND1 and AND2 In the output configuration screen we configure SP4 output to the activation of AND3 6 3 LEDS CONFIGURATION The DTP unit has a total of 16 configurable LEDs These can be associated to the internal protection and communication states A LED can be configured to blink or to remain lit up when activated Similarly the user can selec...

Page 36: ...5A for winding 1 and In 1A for the rest of windings B In 1A for winding 1 and In 5A for the rest of windings C In 1A for windings 1 and 2 and In 5A for windings 3 and 4 Communications 0 3x RS 232 1 2x RS 232 Plastic F O 2 2x RS 232 Glass F O 3 2x RS 232 RS 485 4 P2 P3 Plastic F O a single port with two connectors 5 P2 P3 Plastic F O two ports with two connectors P2 integrable P3 commuted MMI Langu...

Page 37: ...13 kg 7 2 2 ELECTRICAL CHARACTERISTICS Frequency 50 or 60 Hz Auxiliary Voltage 48Vdc or 110 250 Vdc depending on the model 20 Digital Input Voltage Same as auxiliary voltage Thermal Capacity Current circuits Continuous 4 x In During 3 sec 50 x In During 1 sec 100 x In Temperature Operating 20 C to 55 C Storage 40 C to 85 C Humidity Up to 95 without condensation Tripping contacts Rated voltage maxi...

Page 38: ... model Mode Half duplex 1 mm plastic Fiber Optic depending on the model Typical power output 8 dBm Receiver sensitivity 39 dBm Numeric aperture N A 0 5 Wave length 660 nm visible red HFBR 4516 type connector Glass Fiber Optic 62 5 125 depending on the model Typical power output 17 5 dBm Receiver sensitivity 25 4 dBm Numeric aperture N A 0 2 Wave length 820 nm near infrared SMA Type connector ...

Page 39: ...standards C37 90 IEC 255 5 IEC 255 6 and IEC 68 Test Standard Class Insulation Test Voltage IEC 255 5 600V 2kV 50 60 Hz 1 min Impulse Voltage Withstand IEC 255 5 5 kV 0 5 J 1 MHz interference IEC 255 22 1 III Electrostatic discharge IEC 255 22 2 EN 61000 4 2 IV 8 kV Immunity to radio interference IEC 255 22 3 III Electromagnetic fields radiated with amplitude modulation ENV 50140 10 V m Electromag...

Page 40: ...aviour against electromagnetic disturbances All modules are drawout type enabling easy maintenance and repair of the unit The DTP also incorporates a plastic antitampering front cover This cover keeps the relay sealed and provides a high protection against dust and water IP52 index according to IEC 529 The use of a push button allows access to the main functions without the need of removing the co...

Page 41: ...munications connector and the bicolour LED indicator of the unit status The front module is mechanically and solidly connected to the keypad board the electrical connection is done through a flexible flat cable of 12 pins The subgroup formed by these two front boards is connected to the rest of the unit through another flexible flat cable of 40 pins connected to the front of the communications CPU...

Page 42: ...s each of the 12 terminals of each block is labelled from the top to the bottom by a number from 1 to 12 serigraphied on the cover close to each connector where the connection cables are plugged The connector terminals for synchronization are labelled with IRIG B and their polarity is labelled with and For relays with fiber optics communications plastic or glass the connector s transmission and re...

Page 43: ...n port Man machine interface by means of keypads and displays alphanumerical 8 1 8 INPUTS OUTPUTS MODULE DTP units have been designed to allow the maximum capacity for inputs and outputs in each board maintaining at the same time complete reliability against electromagnetic disturbance Every board input has a resistive attenuate which adequates the external voltage battery levels 48 V 125 V to the...

Page 44: ... current limiter is also included for protecting the power supply against unintentional groundings The tripping relays are stronger in capacity and in control operations life than the normal ones used in similar protection equipment and the output contacts can be configured NO or NC providing high versatility The output circuits of the power supply modules to other boards are conditioned so that t...

Page 45: ...ier must be immediately informed in writing and the damage must be reported to the manufacturer When unpacking the relay normal care should be taken in order not to lose the screws documents and other auxiliary elements supplied in the box If it is not intended to install the relay immediately it is recommended to store it in its original package and keep it in a dry dust free and metal particles ...

Page 46: ...e securely grounded 9 2 VISUAL INSPECTION Check that the relay has not suffered any kind of damage due to transportation and handling Check that all screws are sufficiently tight and that the terminal strips have not been damaged in any way Check that the information on the nameplate coincides with that of the ordered model 9 3 INSULATION TESTS Progressively apply 2000 rms volts across all the ter...

Page 47: ... 48 227 250 225 58 205 300 205 9 5 MEASUREMENT CHECK Check that the unit measures correctly applying current by one of the phases to the primary and secondary windings Please take into account that the differential and through currents are given in times the tap and the tap is obtained from Tap Winding tap setting x In For example if all the winding taps are set to 0 5 and the rated current is 5Am...

Page 48: ...y power supply to the unit and check that there is no alarm condition such as protection out of service or disabled trips In this case check that the alarm contact is open 9 7 3 CONFIGURABLE OUTPUTS CHECKING Make one of the configurable contacts close in one of the following ways 1 Activate an 87 trip in phase A and check that J5 K5 closes 2 Activate an 87 trip in phase B and check that J6 K6 clos...

Page 49: ... GE LOCAL communications software perform the connection and check that the relay communicates by both ports Repeat the test for different baud rates 9 9 KEYPAD DISPLAY AND LEDS CHECKING Press the Target Reset button and verify that all the LEDs light up Press the appropriate keys and verify that the following messages are displayed KEY MESSAGE SET VIEW PROTECTION SETTINGS CLR DTP GENERAL ELECTRIC...

Page 50: ...rent in the primary and check that it trips when the differential current is equal or higher than 0 3 2 00 x 0 5 1 30 Check that it trips with an error margin of less than 5 for different through currents and different sensitivity and percentage restraint settings 9 12 HARMONIC RESTRAINT CHECKING Enable the harmonic restraints and the differential function Set sensitivity to 0 3 percentage restrai...

Page 51: ...ifferential function and enable the instantaneous function Set the instantaneous function to 4 times the tap Apply current to the primary and check that it trips when the differential current reaches the set value Check that it trips with an error margin of less than 5 for different differential currents and different instantaneous function settings ...

Page 52: ... are perfectly protected In addition this connection also guarantees the physical safety of the personnel who have to touch the relay since the whole casing is connected to ground 10 3 MAINTENANCE Given the important role that the protection relays play in the operation of any installation a periodic program of tests is highly recommended The unit incorporates built in diagnostic functions which p...

Page 53: ...10 INSTALLATION AND MAINTENANCE 10 2 DTP B Digital Transformer Protection GEK 106243E ...

Page 54: ...e system configuration and the modification of passwords access communication baud rates etc This menu is accessed by keying in the code 7169 In order to access this mode the relay should be on the main screen Single key menu By pressing the ENT key the DTP can be operated in a simplified mode It is not necessary to remove the methacrylate cover on the front of the relay to access this mode When a...

Page 55: ...View settings MODIFY PROTECTION SETTINGS Change settings INF STATUS Shows the status of the relay ACT SET DATE TIME Change date and time on the relay COMM TRIGGER Trigger oscillography by communication ENT DIFFERENTIAL Ia Shows the differential current in phase A in times Itap DIFFERENTIAL Ib Shows the differential current in phase B in times Itap DIFFERENTIAL Ic Shows the differential current in ...

Page 56: ...etwork communications LOC BAUDRATE Baud rate of local communication LOC STOP BITS Stop bits local communication LOCAL SETTINGS Local settings changes allowed not allowed REM SETTINGS Remote settings changes allowed not allowed LOC OPERATION Local operations allowed not allowed REM OPERATIONS Remote operations allowed not allowed UNIT NUMBER Shows the unit number of the relay PASSWORD Allows modifi...

Page 57: ...ice MODIFY PROTECTION SETTINGS IDENTIFICAT 20 character alphanumeric string FREQUENCY Rated frequency of the relay 50 60 Hz 1 st WDG CT RATIO 1 st winding CT ratio 1 4000 in steps of 1 2 nd WDG CT RATIO 2 nd winding CT ratio 1 4000 in steps of 1 3 rd WDG CT RATIO 3 rd winding CT ratio 1 4000 in steps of 1 4 th WDG CT RATIO 4 th winding CT ratio 1 4000 in steps of 1 COMPENSATION Type of compensatio...

Page 58: ...d1 d5 d7 d11 OSCILLOS MASK PREFAULT CYCLES Number of programmable prefault cycles 2 10 87B TRIP PHASE A Starts the oscilloperturbograph Enabled Disabled 87B TRIP PHASE B Starts the oscilloperturbograph Enabled Disabled 87B TRIP PHASE C Starts the oscilloperturbograph Enabled Disabled 87 TRIP PHASE A Starts the oscilloperturbograph Enabled Disabled 87 TRIP PHASE B Starts the oscilloperturbograph En...

Page 59: ...FUNCTION SENSITIVITY Sensitivity of the protection 0 2 0 4 x It RESTR CHANGE Inflexion point between the two slopes of the protection 0 10 x It RESTRAINT K1 Percentange restraint of the first slope 15 100 RESTRAINT K2 Percentage restraint of the second slope 15 100 2 nd HARM RESTR Second harmonic restraint 12 100 5 th HARM RESTR Fifth harmonic restraint 12 100 87B TAP Pickup value for the 87B unit...

Page 60: ...he relay will request confirmation of the change displaying the following message 7 If you want to confirm this change press the 1 Y key If not press 3 N 8 The relay will then show the following message on the screen 9 Press the CLR key repeatedly in order to return to the initial screen If the setting entered is outside the limits of the range allowed for that setting the relay will not accept th...

Page 61: ...WDG Ib MOD Phase B current module for the 2nd winding 2ND WDG Ib ANG Phase B current argument for the 2nd winding 2ND WDG Ic MOD Phase C current module for the 2nd winding 2ND WDG Ic ANG Phase C current argument for the 2nd winding 3RD WDG Ia MOD Phase A current module for the 3rd winding 3RD WDG Ia ANG Phase A current argument for the 3rd winding 3RD WDG Ib MOD Phase B current module for the 3rd ...

Page 62: ...kup trip 87B B TRIP Phase B backup trip 87B C TRIP Phase C backup trip 87 A TRIP Phase A differential trip 87 B TRIP Phase B differential trip 87 C TRIP Phase C differential trip PROTEC STATUS Protection in out of service ACTIVE TABLE Number of active table 1 3 LOCAL CONNECTION Local or remote connection E2PROM COMM Error or lack of error in the communications E2PROM COMM SETTINGS Communications s...

Page 63: ... steps must be taken NOTE If the user would like to replace the numerical value displayed by default press the CLR key to clear the displayed value and include the new one The operation of the OSCILLOGRAPHY TRIGGER starts the oscillography register and the storage of a record Using the GE_LOCAL communication software it is possible to retrieve the last four oscillography records and save them in a...

Page 64: ... MAGNITUDE DESCRIPTION DIFFERENTIAL Ia Phase A differential current DIFFERENTIAL Ib Phase B differential current DIFFERENTIAL Ic Phase C differential current DIF Ia 2ND HARM Phase A 2nd harmonic current DIF Ib 2ND HARM Phase B 2nd harmonic current DIF Ic 2ND HARM Phase C 2nd harmonic current DIF Ia 5TH HARM Phase A 5th harmonic current DIF Ib 5TH HARM Phase B 5th harmonic current DIF Ic 5TH HARM P...

Page 65: ...dded to each byte which is transmitted on the serial line It is treated as a binary logic setting selected by means of the logic key 1 Y for 1 and 3 N for 2 LOC BAUDRATE The speed in bauds which the DTP will use for serial communications through the local port The possible speeds are between 1200 and 19200 bauds LOC STOP BITS As above but for local communications LOCAL SETTINGS Settings changes by...

Page 66: ...12 FIGURES GEK 106243E DTP Digital Transformer Protection 12 1 12 FIGURES Figure 1 External Connections ...

Page 67: ...12 FIGURES 12 2 DTP B Digital Transformer Protection GEK 106243E Figure 2 Panel Drilling Dimensions ...

Page 68: ...12 FIGURES GEK 106243E DTP Digital Transformer Protection 12 3 Figure 3 RS 232 Connection ...

Page 69: ...12 FIGURES 12 4 DTP B Digital Transformer Protection GEK 106243E Figure 4 Dimensions Diagram ...

Page 70: ...12 FIGURES GEK 106243E DTP Digital Transformer Protection 12 5 Figure 5 Front View ...

Page 71: ...mple Transformer for the Calculation of Settings 4000KVA 5000KVA FORCED COOLING THE INDICATED RATIOS FOR MAIN CTS ARE USED IN THE FIRST ITERATION OF THE CALCULATION EXAMPLE THE MAIN CT CONNECTIONS SHOWN ALL WYE CONNECTED ARE SO BECAUSE THE PHASE SHIFT IS PERFORMED BY THE RELAY ...

Page 72: ...URES GEK 106243E DTP Digital Transformer Protection 12 7 Figure 7 Operating Principles of the Differential Protection PROTECTED ELEMENT PROTECTED ELEMENT PROTECTED ELEMENT OPERATION CIRCUIT RESTRAINT CIRCUIT ...

Page 73: ...12 FIGURES 89 DTP B Digital Transformer Protection GEK 106243E Figure 8 Block Diagram of the Protection ...

Page 74: ...6243E DTP Digital Transformer Protection 12 9 Figure 9 Percentage Characteristic 2 1 0 2 4 5 1 3 DIFFERENTIAL CURRENT IN MULTIPLES OF TAP THROUGH CURRENT IN MULTIPLES OF TAP Sensitivity Break Point TRIP ZONE K2 40 K 25 ...

Page 75: ...NG CONN ST Y 2 WINDING CONN ND y O 2 WDG H GROUP ND 1 WDG CT CONN ST Y0 2 WDG CT CONN y0 ND SETTINGS FOR Y y O CONNECTION P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C IB IA IC 1 1 1 A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 Ic 1 Ib 1 Ia 1 a b c B6 B4 B5 B2 B3 B1 DTP B C C B B A A b b c c a a WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR Y y O CONNEC...

Page 76: ...12 FIGURES GEK 106243E DTP Digital Transformer Protection 12 11 Figure 11 Internal match of power transformer connection 189C4218 ...

Page 77: ... WDG CT CONN y0 ND SETTINGS FOR D z O CONNECTION B A B C A D z O C b c a Ic Ib Ib Ia Ia Ic WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR D z O CONNECTION POWER TRANSFORMERS 1 P1 a b P1 c P1 1 S1 S2 S2 S1 P2 P2 Ia Ib S2 S1 P2 1 1 1 B6 1 B4 B5 B3 B2 B1 C C B B A A IB IA IA IC IC IB S2 S1 a A IA b a B IB S1 S2 P2 P2 C b C B IC S1 S2 P2 P1 A B P1 C P1 1 1 1 A1 A4 A6 A5 A3 A2 1 1 1 DTP B A IA IC IB IA IC...

Page 78: ...WINDING CONN ND y 11 2 WDG H GROUP ND 1 WDG CT CONN ST Y0 2 WDG CT CONN y0 ND SETTINGS FOR D y 11 CONNECTION a b c P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C IB IA IA IC IC IB 1 1 1 A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 Ic 1 Ib 1 Ia 1 a b c B6 B4 B5 B2 B3 B1 DTP B B B C C A A WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR D y 11 CONNECTION POWE...

Page 79: ...INDING CONN ND d 11 2 WDG H GROUP ND 1 WDG CT CONN ST Y0 2 WDG CT CONN y0 ND SETTINGS FOR Y d 11 CONNECTION A B C P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 IA 1 IB 1 IC 1 a b c B6 B4 B5 B2 B3 B1 DTP B a a b b c c WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR Y d 11 CONNECTION POWER TRANSFORMERS C C B B A ...

Page 80: ...WINDING CONN ND y 5 2 WDG H GROUP ND 1 WDG CT CONN ST Y0 2 WDG CT CONN y0 ND SETTINGS FOR D y 5 CONNECTION c b a P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C IB IA IA IC I C IB 1 1 1 A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 Ic 1 Ib 1 Ia 1 a b c B6 B4 B5 B2 B3 B1 DTP B B B C C A A WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR D y 5 CONNECTION POWER ...

Page 81: ...2 WINDING CONN ND d 5 2 WDG H GROUP ND 1 WDG CT CONN ST Y0 2 WDG CT CONN y0 ND SETTINGS FOR Y d 5 CONNECTION A B C P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 IA 1 IB 1 IC 1 a b c B6 B4 B5 B2 B3 B1 DTP B a a b b c c WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR Y d 5 CONNECTION POWER TRANSFORMERS C C B B A ...

Page 82: ...NG CONN d 6 2 WDG H GROUP ND 1 WDG CT CONN ST Y0 2 WDG CT CONN y0 ND SETTINGS FOR D d 6 CONNECTION c b a P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C IB IA IA IC IC IB 1 1 1 A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 a b c B6 B4 B5 B2 B3 B1 DTP B B B C C A A WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR D d 6 CONNECTION POWER TRANSFORMERS 1 1 1 c c a...

Page 83: ... Y 2 WINDING CONN ND y 6 2 WDG H GROUP ND 1 WDG CT CONN ST Y0 2 WDG CT CONN y0 SETTINGS FOR Y y 6 CONNECTION A B C b c a P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 IA 1 IB 1 IC 1 a b c B6 B4 B5 B2 B3 B1 DTP B WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR Y y 6 CONNECTION POWER TRANSFORMERS C C B B A A Ia I...

Page 84: ... CT CONN ST NA 2 WDG CT CONN NA ND SETTINGS FOR Y y O CONNECTION NA Not applicable not used when compensation is set to EXTERNAL P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C IB IA IA IC IC IB 1 1 1 A1 A2 A4 A3 A6 A5 a b a c c b P1 P1 P1 S1 S2 S2 Ia P2 Ib P2 S1 S2 Ic P2 S1 Ic Ib 1 Ib Ia 1 Ia Ic 1 a b c B6 B4 B5 B2 B3 B1 DTP B C A B C C B B A A b b c c b a a a WIRING FOR DTP B RELA...

Page 85: ... 2 WDG CT CONN NA ND SETTINGS FOR D d O CONNECTION NA Not applicable not used when compensation is set to EXTERNAL a c B D d 0 b C A B C A DTP B a a c c D d O CONNECTION POWER TRANSFORMERS WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR P1 a P1 b P1 c P2 S1 S2 P2 Ia Ib S1 S2 P2 S1 S2 Ic 1 1 Ib Ia B6 Ia Ic 1 1 B1 B3 B2 B5 B4 Ic Ib 1 1 A A C C b b B B IC IB IA IC IB IA S1 S2 a A IA b a B A IB S2 S1 P2 P...

Page 86: ... CT CONN ST NA 2 WDG CT CONN NA ND SETTINGS FOR Y y 6 CONNECTION NA Not applicable not used when compensation is set to EXTERNAL P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C IB IA IA IC IC IB 1 1 1 A1 A2 A4 A3 A6 A5 a b a c c b P2 P2 P2 S1 S2 S2 Ia P1 Ib P1 S1 S2 Ic P1 S1 Ic Ib 1 Ib Ia 1 Ia Ic 1 a b c B6 B4 B5 B2 B3 B1 DTP B C A B C C B B A A b b c c c b a a WIRING FOR DTP B RELA...

Page 87: ...NN ST NA 2 WDG CT CONN NA ND SETTINGS FOR D d 6 CONNECTION NA Not applicable not used when compensation is set to EXTERNAL a b c B C A D d 6 IB IA IA IC IC IB 1 1 1 A1 A2 A4 A3 A6 A5 Ic Ib 1 Ib Ia 1 Ia Ic 1 B6 B4 B5 B2 B3 B1 DTP B WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR D d 6 CONNECTION POWER TRANSFORMERS 1 1 1 1 1 1 B C C A B A S2 P2 IA P2 S1 S2 S2 IC IB P2 S1 S1 P1 A P1 B P1 C a P1 b P1 S1 S...

Page 88: ...1 WDG CT CONN ST NA 2 WDG CT CONN NA ND SETTINGS FOR Y d 5 CONNECTION NA Not applicable not used when compensation is set to EXTERNAL a b c P1 A P2 IA A A B B IB P2 C C IC P2 S1 S2 S2 S1 S1 S2 P1 B P1 C IB IC IA IB IC IA 1 1 1 A1 A2 A4 A3 A6 A5 a b a c c b Ia Ib Ic DTP B C C B B A A WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR Y d 5 CONNECTION POWER TRANSFORMERS 1 1 1 Ic Ib Ib Ic Ic Ia P2 a P2 b S2...

Page 89: ...NN ST NA 2 WDG CT CONN NA ND SETTINGS FOR D y 5 CONNECTION NA Not applicable not used when compensation is set to EXTERNAL B C A B C A D y 5 DTP B c c b b WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR D y 5 CONNECTION POWER TRANSFORMERS Ia Ic Ib Ia Ic Ib S2 S2 P2 a b P2 S2 c P2 S1 S1 P1 P1 S1 1 1 1 P1 B6 1 1 1 B5 B4 B3 B1 B2 Ia Ib Ic a b a c b c C C A A B B IB IA IA IC IC IB S2 S1 A IA B A IB S1 S2 ...

Page 90: ...A 2 WDG CT CONN NA ND SETTINGS FOR Y d 11 CONNECTION NA Not applicable not used when compensation is set to EXTERNAL b Y d 11 a C B A B A b b a a c c Y d 11 CONNECTION POWER TRANSFORMERS WIRING FOR DTP B RELAY CURRENT CIRCUITS FOR 1 1 Ib Ic P1 a b P1 c P1 1 Ia Ib 1 S2 S1 S1 S2 P2 P2 Ia Ib S1 S2 P2 1 Ic Ia 1 Ic B6 B5 B4 B3 B1 B2 A A C C B B IC IA IB IC IA IB S1 S2 a A IA b a B A IB S2 S1 P2 P2 C c ...

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