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Protection functions

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Earth fault external toroid

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Protection against earth fault (51N)

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Selection of threshold Io> value

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Selection of type of Io> curve

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Selection of to> trip time

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Protection against instantaneous or delayed earth fault (50N)

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Selection of Io>> threshold value

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Selection of to>> trip time

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Rated and setting currents

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PR512/P (50-51-50N-51N) UNIT

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Summary of Contents for PR512

Page 1: ...Medium Voltage Products PR512 Microprocessor based self supplied protection relays ...

Page 2: ......

Page 3: ... DESCRIPTION CHARACTERISTICS AND ORDERING CODES PR512 P 50 51 UNIT PR512 P 50 51 50N 51N UNIT PR512 PD 50 51 50N 51N DIALOGUE UNIT TIME CURRENT CURVES OVERALL DIMENSIONS ELECTRICAL CIRCUIT DIAGRAM 3 7 11 15 21 25 31 33 ...

Page 4: ...2 ...

Page 5: ... features 4 Protection always active 5 Use 5 Electromagnetic compatibility 6 Service conditions 6 Degrees of protection 6 Technical documentation 6 Quality System and Environmental Management System 6 DESCRIPTION ...

Page 6: ... characteristics and operating reliability Processing of the RMS value to express the true energy content of the current PR512 P 50 51 provides the protection functions against overload 51 instantane ous or delayed short circuit 50 displays the phase current with the highest load PR512 P 50 51 50N 51N provides the protection functions against overload 51 instantane ous or delayed short circuit 50 ...

Page 7: ... current transformers which also make the current signal to be processed available Operation is ensured even with the primary circuit with single phase power supply Thanks to these characteristics the PR512 are also suitable for use in unmanned distribution substations without auxiliary services Use The PR512 relays can be installed in medium voltage primary or secondary distribution switch boards...

Page 8: ...ompatibility EMC in respect of which the releases are marked with the CE mark Service conditions Operating temperature 5 C 40 C Storage temperature 40 C 90 C elative humidity without condensation 90 MTBF 15 years at an operating temperature of 45 C Degrees of protection The degree of protection of the units mounted in a switchboard is IP30 For higher degrees of protection please consult ABB Techni...

Page 9: ...al toroid 8 Power supply 8 Opening solenoid 8 Protection and trip signals 8 Binary input for control function 9 TEST function 9 Signalling outputs 10 Technical data of the relay contacts 10 Measuring function 10 Ordering codes 10 CHARACTERISTICS AND ORDERING CODES ...

Page 10: ...ction and measuring functions even in the absence of an auxiliary power supply starting from a minimum value of primary current of 0 2 x In on at least one phase fitted with CT The external toroid for the protection functions 50N 51N does not contribute to the self supply The unit can be fitted with an auxiliary power supply with 24 Vd c rated voltage should the protection measuring and control fu...

Page 11: ...hes 1 and 2 in position A and press the TEST pushbutton to release the YO3 opening solenoid with consequent circuit breaker opening Put Dip Switches 1 and 3 in position A and press the TEST pushbutton to check functions I and I Front view of the TT2 Test Unit Rear view of the TT2 Test Unit TEST function By using the TT2 accessory Test Unit supplied on request the overall functionality TEST of the ...

Page 12: ...istics maximum interrupted current 0 8 A maximum interrupted voltage 110 Vca Vcc maximum interrupted load at 24 Vdc inductive L R 7 ms 10 W resistive 24 W maximum interrupted load at 48 Vac inductive cosj 0 4 15 VA resistive 30 VA contact contact insulation 500 Veff contact coil insulation 1000 Veff Measuring function The liquid crystal display allows the most highly loaded phase current to be sho...

Page 13: ...Selection of threshold I value 12 Selection of type of I curve 12 Selection of t trip time 13 Protection against instantaneous or delayed short circuit 50 13 Selection of I threshold value 13 Selection of t trip time 14 Rated and setting currents 14 PR512 P UNIT 50 51 ...

Page 14: ...ite time delay curves For definite time delay protection the relationship between trip time and overcurrent is given by the following formula Caption t trip time k parameter set by the user to select the trip curve a b pair of parameters depending on the type of protection selectable I fault current I trip threshold selectable by the user The threshold value of this protection is indicated by I wh...

Page 15: ...or delayed short circuit 50 This function makes a family of definite adjustable time curves available indicated by the symbol I The corresponding trip time is indicated by the symbol t Start of timing is signalled by the ALARM LED lighting up whereas circuit breaker opening is signalled on the front by the magnetic flag I I turned to the yellow position To reset signalling the FLAG RESET pushbutto...

Page 16: ...Rated and setting currents In rated current of current transformer I setting value of overload current 51 I setting value of short circuit current 50 Io setting value of earth fault current first threshold 51N Io setting value of earth fault current second threshold 50N 1 If an external toroidal current transformer is used recalculate the setting values according to its primary rated current Curre...

Page 17: ...lt 51N 16 Selection of threshold Io value 16 Selection of type of Io curve 17 Selection of to trip time 17 Protection against instantaneous or delayed earth fault 50N 18 Selection of Io threshold value 18 Selection of to trip time 18 Rated and setting currents 19 PR512 P 50 51 50N 51N UNIT ...

Page 18: ... internal toroid is disabled when the fault current is higher than 3 x In with an external toroid no disablement is foreseen Protection functions The PR512 P 50 51 50N 51N unit carries out all the functions of the PR512 P 50 51 unit as well as the following protection functions 51N protection against earth fault 0 2 I 2 In rms 2 I 20 In peak 50N protection against instantane ous or delayed earth f...

Page 19: ...0 0 150 0 200 0 250 0 350 0 400 0 450 0 500 0 600 0 650 0 700 0 750 0 850 0 900 0 950 1 x In OFF 1 The unit guarantees no entry in the threshold for currents under 1 05 x Io set and guarantees entry in the threshold for currents higher than 1 30 x Io set Selection of type of Io curve Four different time current relationships can be selected Fixed time curve b 2 For protection with fixed time DT th...

Page 20: ...n the figure below The sum of the values selected represents the multiple of Io and corresponds to threshold Io N B Even if protection Io is OFF the first Dip Switch takes on the value 0 1 Also remember that the Io function with internal toroid is disabled when the fault current exceeds 3 x In regardless of the value set for the threshold With an external toroid no disablement is fore seen Selecti...

Page 21: ...dal current transformer is used recalculate the setting values according to its primary rated current Current Protection functions transformer CT In I I Io Io A 0 2 1 x In A 2 5 20 x I A 0 1 1 x In A 1 2 5 20 x Io A 1 40 8 40 20 800 4 40 10 800 80 16 80 40 1600 8 80 20 1600 100 20 100 50 2000 10 100 25 2000 150 30 150 75 3000 15 150 37 5 3000 200 40 200 100 4000 20 200 50 4000 250 50 250 125 5000 ...

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Page 23: ...and dialogue functions 22 Binary inputs 22 Outputs for controlling the shunt opening and closing releases 22 Dialogue function 22 Electrical characteristics of the relay contacts 24 PR512 PD 50 51 50N 51N DIALOGUE UNIT ...

Page 24: ...512 PD unit with normally open contacts through which circuit breaker opening and closing can be controlled remotely Dialogue function Dialogue with the centralised system The serial interface used complies with the EIA RS485 Standard and therefore the connections must be made respecting the rules of this stand ard For further details ABB can be asked for the following documents 401517 Examples of...

Page 25: ...nal bus h state of the circuit breaker circuit breaker open circuit breaker closed circuit breaker connected or isolated state of the operating mechanism springs discharged or charged Data received The PR512 PD unit can receive the following data from the centralised control system a all the parameters of the protection functions b circuit breaker opening command c circuit breaker closing command ...

Page 26: ... following electrical characteristics maximum interrupted current 5 A maximum interrupted voltage 250 Vca 130 Vcc maximum interrupted load at 48 Vdc inductive L R 7 ms 25 W resistive 50 W maximum interrupted load at 220 Vac inductive cosj 0 4 500 VA resistive 800 VA contact contact insulation 1000 Veff contact coil insulation 2000 Veff ...

Page 27: ...5 6 Definite time curve DT 26 Normal inverse time delay curve NI 27 Very inverse time delay curve VI 28 Extremely inverse time delay curve EI 29 Time current curves for earth fault 30 TIME CURRENT CURVES ...

Page 28: ...6 10 1 55 0 2 3 2 100 0 1 0 05 0 01 0 9 1 3 1 10 2 2 20 3 3 4 4 5 5 6 6 I I I kA t s 2 5 I I 20 7 7 8 8 9 9 K 1 6 I I Definite Time Curve IEC 255 3 1 t K 0 1 t Definite time curve DT TIME CURRENT CURVES ...

Page 29: ...27 6 10 1 55 100 0 1 0 05 0 01 0 9 1 3 1 10 2 2 20 3 3 4 4 5 5 6 6 I I I kA t s 2 5 I I 20 7 7 8 8 9 9 t K 1 6 I I Normal Inverse Time Curve IEC 255 3 1 K 0 1 t Normal inverse time delay curve NI ...

Page 30: ...0 1 55 100 1 0 1 0 05 0 01 0 9 1 3 1 10 2 2 20 3 3 4 4 5 5 6 6 I I I kA t s 2 5 I I 20 7 7 8 8 9 9 K 1 6 I I Very Inverse Time Curve IEC 255 3 t K 0 1 t TIME CURRENT CURVES Very inverse time delay curve VI ...

Page 31: ...29 6 10 100 0 1 0 05 0 01 0 9 1 3 1 10 2 2 20 3 3 4 4 5 5 6 6 I I I kA t s 2 5 I I 20 7 7 8 8 9 9 t K 1 6 I I Extremely Inverse Time Curve IEC 255 3 1 55 1 K 0 1 t Extremely inverse time delay curve EI ...

Page 32: ...es for earth fault The time current curves for homopolar earth fault Io Io are identical to those for protection against overload and against short circuit I I For the operating fields please see what is indicated on page 25 and following pages ...

Page 33: ...31 7 Dimensions and fixing 32 OVERALL DIMENSIONS ...

Page 34: ...r fixing the unit to the support square 4 Rear view of connec tors 5 View from above Threaded holes are provided on the release box for application of the fixing brackets for assembly on the compartment door N B The dimensions indicated include the overall dimensions of the connection connectors Dimensions and fixing The overall dimensions are as follows height 160 mm width 130 mm depth 160 mm ...

Page 35: ...33 8 Diagrams of the applications 34 Operating state shown 35 Caption 36 Notes 37 Connections 38 Graphic symbols for electrical diagrams 38 ELECTRICAL CIRCUIT DIAGRAM ...

Page 36: ...s shown correspond with ABB 401530 document However they are for indicative purposes In case of use it is advisable to ask for the latest updated document To take evolution of the product into consideration it is useful to refer to the circuit diagram supplied with each circuit breaker ...

Page 37: ...0N 51N Operating state shown The diagram is shown under the following conditions circuit breaker open and connected see note B circuits de energised circuit breaker closing springs discharged overcurrent release not tripped ...

Page 38: ...ning solenoid with trip for overcurrent ELECTRICAL CIRCUIT DIAGRAM Caption See note indicated by the letter K51 Microprocessor based type PR512 P protection or PR512 PD protec tion and dialogue type overcurrent release with the following protec tion functions see note C against overload with long definite inverse very inverse or extremely inverse trip time against short circuit with definite short...

Page 39: ... signals K51 YO3 and K51 mP signalling contacts signalling lamp and optic indicators reset of signalling contacts and optic indica tors The Uaux auxiliary power supply is always needed to guarantee correct dialogue operation only for PR512 PD relay The presence of primary current 0 2 In on at least one phase fitted with current transformer ensures correct operation of all the protec tion measuring...

Page 40: ...S751 binary input screened cable TI4069 2x0 2 code 07108 serial interface W1 screened cable T54566 code 56884 opening solenoid YO3 screened cable TI4065 2x1 code 07136 current transformer circuits TI screened cable TI4065 2x1 code 07136 remaining circuits cables T14018 Mechanical pneumatic or hydraulic connection Rotary control Pushbutton control Earth general symbol Mass frame Equipotentiality Co...

Page 41: ...witch Power circuit breaker Control coil general sign Overcurrent unit with long adjustable time delay characteristic Overcurrent unit with long inverse adjustable time delay characteristic Overcurrent unit with short adjustable time delay characteristic Overcurrent unit for earth fault with long adjustable time delay characteristic Overcurrent unit for earth fault with long inverse time delay cha...

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Page 44: ...9 035 6952 874 e mail sacetms tipm it abb com www abb com The data and illustrations are not binding We reserve the right to make changes without notice in the course of technical development of the product Copyright 2010 ABB All rights reserved Contact us 1VCP000055 Rev D en Technical Catalogue 2010 03 PR512 gs ...

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