MiCOM P721 & P723. High Impedance Differential Protection. P72x/EN TDS/B21. Technical Data Sheet. This document does not replace the Technical Manual

Transcription

1 MiCOM P721 & P723 High Impedance Differential Protection P72x/EN TDS/B21 Technical Data Sheet This document does not replace the Technical Manual

2 Note: The technical manual for this device gives instructions for its installation, commissioning, and operation. However, the manual cannot cover all conceivable circumstances or include detailed information on all topics. In the event of questions or specific problems, do not take any action without proper authorization. Contact the appropriate Schneider Electric technical sales office and request the necessary information. Any agreements, commitments, and legal relationships and any obligations on the part of Schneider Electric including settlements of warranties, result solely from the applicable purchase contract, which is not affected by the contents of the technical manual. This device MUST NOT be modified. If any modification is made without the express permission of Schneider Electric, it will invalidate the warranty, and may render the product unsafe. The Schneider Electric logo and any alternative version thereof are trademarks and service marks of Schneider Electric. MiCOM is a registered trademark of Schneider Electric. All trade names or trademarks mentioned herein whether registered or not, are the property of their owners. This manual is provided for informational use only and is subject to change without notice. 2012, Schneider Electric. All rights reserved.

3 Protection Relays 01 MiCOM P721 & P723 Numerical High Impedance Differential Relay The new P72x high impedance differential protection series provides an independent and simple high impedance differential protection solution for generator, reactor, motor and busbar applications where fast clearance of faults is required. Combined with the P79x, a standalone metrosil and resistor unit, it provides simplified scheme engineering for single or three-phase differential applications. Customer Benefits Simple scheme engineering Reliable algorithm Supervision functions included in the same protection box As well as offering the same application benefits as traditional high impedance electromechanical protection schemes, it combines the added benefits of numerical technology to provide advanced communications, event records, fault records, disturbance records and ancillary protection features.

4 Protection Relays MiCOM P72x 02 APPLICATION When circulating current protection schemes are subjected to through faults, the sudden and often asymmetrical growth in the system current can cause the line current transformers to reach saturation. Under these conditions the variation in current transformer magnetising characteristics can cause large ratio errors with a consequent circuit imbalance and maloperation of the protective relays. To ensure stability, it is common practice to employ high impedance relays set to operate at a slightly higher voltage than that developed in the worst theoretical case of this condition for a given through fault current. On a balanced earth fault system for example, this is when one current transformer of a group is saturated whilst the others remain unaffected. The saturated transformer presents a low impedance path in parallel with the relay and limits the voltage applied. For internal faults this limitation does not exist and voltages of twice the setting are easily reached resulting in fast operation of the differential relay. The P72x relay together with the P79x unit, is designed for applications where sensitive settings with stability on heavy through faults are required. It offers a reliable protection for busbars, transformers windings, generators, reactors and motors. FUNCTIONAL OVERVIEW OVERVIEW Two models are available: MiCOM P721 is a single-phase high impedance differential protection. It is suitable for restricted earth fault or balanced earth fault applications. MiCOM P723 can be configured either as high impedance differential three-phase protection (87) or as high impedance differential earth protection (87N). The connection setting determines whether 87 or 87N is being used. Main functions Phase segregated high impedance differential protection (87A, 87B, 87C) The application of P723 numerical relay as differential protection for machines and busbar installations is based on the high impedance differential principle. This principle requires stabilising resistors in each phase and a metrosil is generally required across the relay circuit. These are included in the P79x accessory as shown in Figure 1. Stability for any type of fault occurring outside the protected zone and satisfactory operation for faults within the zone are achieved. Figure 1 shows the typical application diagram where P723 is configured as a phase segregated high impedance differential protection. Protected Plant I diff R ST Metrosil P79x 87P 87N Remote Comm. Port Local Communication Self Monitoring Fault Records Measurements Disturbance Record 95P LEDs 95N 50BF Binary Input / Output P72x P72x and P79x together offer a simple and reliable high impedance differential protection

5 Protection Relays MiCOM P72x 03 PROTECTION FUNCTIONS OVERVIEW ANSI Features P721 P723 87P Phase segregated high impedance current differential protection 95P Phase bus-wire supervision 87N Restricted earth fault protection 95N Earth bus-wire supervision 87CZ Check zone input 50BF Breaker failure detection GENERAL FEATURES Features P721 P723 Number of opto-isolated inputs 2 5 Number of relay output contacts 4 8 Event recording Fault recording Disturbance recording 5 5 Instantaneous records 5 5 Setting groups 2 2 Auxiliary timers 4 4 Communication protocols Modbus RTU (rear port) DNP3 (rear port) IEC (rear port) Modbus RTU (front port) Setting software MiCOM S1 Studio Logic equations AND, OR and NOT gates 8 Boolean equations Measurements Neutral supervision/differential currents (INdiff) Phase supervision/differential currents (IAdiff, IBdiff and ICdiff) Maximum differential currents (ImaxAdiff, ImaxBdiff and ImaxCdiff) Maximum differential neutral currents (ImaxNdiff) Figure 1: P723 configured as phase segregated high impedance differential busbar protection

6 Protection Relays MiCOM P72x 04 High impedance differential earth fault protection (87N) The P721 has a single differential element and may only function as an 87N protection. The P723 can be configured as 87N when only one analogue current input is required. Restricted earth fault protection is included to cover a larger percentage of the transformer windings than might be possible with the main biased differential transformer protection. 87N is commonly referred as restricted earth fault (REF) protection for star windings and balanced earth fault (BEF) protection for delta windings. Figures 2 and 3 show the P72x configured for these applications. GENERAL SCHEME LOGIC The schemes in figures 4 and 5 describe the logic of the three-phase high impedance differential protection and high impedance differential earth fault protection relays. External blocking inputs are available to allow the user to configure an input to enable or disable the differential element. A selectable logic input is also available as a check zone input from another P72x or differential relay. [87] DIFF Blocking Logic 1 / 2 & DT [87CZ] Check Zone & Start [87] DIFF Temporized [87] tdiff [95] SUP DT Start [95] SUP Temporized [95] tsup Figure 4: General scheme of the three-phase high impedance differential protection [87N] DIFF Start [87N] DIFF Blocking Logic 1 / 2 & DT Temporized [87N] tdiff [95N] SUP Start [95N] SUP DT Temporized [95N] tsup Figure 2: BEF protection for the delta winding of a power transformer with supply system earthed Figure 5: General scheme of high impedance differential earth fault protection Control AND INDICATION Control Two blocking logics are available where for example opto inputs can be independently configured to block the differential element or any of the auxiliary timer functions. Logic equations The MiCOM P72X relays integrate complete logic equations to allow customization of the product based on customer application. Up to 8 independent Boolean equations can be used. Each equation offers the possibility to use AND, OR & NOT logical gates. Up to 16 parameters can be used for each equation. Every result of equation can be time delayed and assigned to any output relays, trip, trip latching and/or HMI LEDs. Figure 3: REF protection of a 3 phase, 4 wire system applicable to star connected generators or power transformer windings with neutral earthed at generator/transformer star point

7 Protection Relays MiCOM P72x 05 Optos Protection elements Automatic Control Gate Logic Timers Relay contacts LED's Phase segregated outputs are available from the buswire supervision such that each phase can be stabilised by short circuiting the bus-wires as required. The differential elements are internally blocked due to bus-wire supervision (although this will not negate the requirement for external shorting of bus-wires). LEDs Four programmable LEDs are available. Alarms Protection and control functions generate alarms on the screen and LEDs as configured. Certain alarms can be inhibited or automatically reset by preliminary parameter setting. Alarms can be stored in non-volatile memory. SUPERVISORY FUNCTIONS Open circuit failures of the CTs or bus-wires will cause a spill current to flow through the differential element and operation will occur if this current is greater than the setting. Two methods are used to prevent nuisance tripping due to open circuit conditions: 1. Bus-wire supervision elements are provided to monitor for a continuous low level of spill current. After a time delay, this relay would usually short circuit the AC bus-wires to ensure stability and also give an alarm. The disadvantage of this scheme is that the differential elements must be set higher than the bus-wire supervision elements (and usually above maximum load conditions) if nuisance tripping is to be avoided. This may create sensitivity issues. 2. Duplicate differential elements (main and check zones) fed from separate CTs using segregated (phase by phase) bus-wires. Tripping is only permitted when both differential elements operate. The advantage of this scheme is that the differential settings can remain very sensitive (below full load current values), but this will require a total duplication of the scheme. The selectable logic input from another P72x deployed as a check zone is available for this function. The above two methods are usually used in conjunction with each other, although to reduce costs either scheme could be used independently. Bus-wire Shorting To limit the power dissipated in the resistance, after the differential trip protection [87] or bus-wire supervision [95] are activated, the bus-wires must be short-circuited. This function is latched in the internal logic. The bus-wire shorting signal can be connected as shown in figures 1, 2 and 3. CB Failure function The CB failure output from the P72x is an input to the breaker failure scheme. The general scheme for the breaker failure detection function is shown in figure 6. Trip [87] tdiff Idiff< Pick up timer CB Fail time tbf Figure 6 CBF detection logic & CB Fail Operation AND CONfiguRATION Setting groups External conditions may request the need for different settings. MiCOM P72x provide two independent setting groups. The active setting group can be switched to the other from the local HMI or from external conditions (opto input change of state or DCS control). Multi-language user interface (HMI) All functions, including protection, automation, communication, LEDs, inputs and outputs, can be programmed and modified using the front panel user interface (Human Machine Interface, HMI). The backlit LCD informs the user about settings, measurements & faults thanks to the pull-down structure menu allowing easy and quick access to any data. Moreover, even if the relay is delivered with the language specified at the order, the user can change the language used within the relay from the HMI.

8 Protection Relays MiCOM P72x 06 trip led clear Key Alarm led Device fail. Power supply freely Programmable leds battery is not used anymore Read Key cursor Keys Rs 232 The P721 and P723 measure the neutral supervision/differential currents (I Ndiff ). The P723 measures the maximum differential currents (Imax Adiff, Imax Bdiff and Imax Cdiff ). The P721 and P723 measure the maximum differential neutral currents (Imax Ndiff ). Fault records 25 time-tagged fault records that indicate the faulted phase, protection operation, active setting group, pre-fault and differential fault currents magnitudes are available. Disturbance records A disturbance record is generated for every trip. In addition, the disturbance recorder can be triggered by an opto-isolated input, or a remote control signal. MeasuREMENTS and RECORDING Measurements The following measurements are available for display and remote measurements: The P723 measures Phase supervision/ differential currents (I Adiff, I Bdiff and I Cdiff ). Up to five records of 3 seconds each one can be stored. The disturbance records are 32 samples per cycle. Event records 250 time-tagged event records can be stored. Events include operation and reset of inputs/ outputs, alarms, internal signals, and contacts. All events are time stamped to 1ms, and can be accessed either locally or remotely. Figure 7: Disturbance Record

9 Protection Relays MiCOM P72x 07 COMMUNICATION & SYNCHRONIZATION The MiCOM P72x offers a wide range of communication protocols, allowing its utilisation in most of the network control and data acquisition systems (via Modbus, IEC , and DNP3.0). It has been designed for permanent multi-drop connection through the rear RS485 communication port. The MiCOM P72x incorporates an internal clock used for the time tagging of alarms, events, fault and disturbance record. The relay s internal clock is synchronise to the timing information to an accuracy of 1ms.To avoid any drifting of the time tagging clock, it s necessary to periodically synchronize the relays. To do this P72x offers two solutions: 1. Synchronization from the substation control system via the rear communication port 2. Synchronization from an external GPS clock via a dedicated digital input Stabilising RESISTOR AND VARISTOR ACCESSORY The P79x accessory contains a number of fixed resistors that provide stability during external faults. In addition to the stabilising resistors, a varistor is included for each phase. Two models are available: the P791 used in single phase applications and the P793 used in three phase applications. Stabilising resistor Three options of internal stabilising resistors are offered. In each option is possible to get 4 combinations of serial and parallel connections to give various values of resistance as required by the application. Varistor Varistors are used to limit the peak voltage developed by the current transformers under internal fault conditions to a value below the insulation level of the current transformers, relay and interconnecting wiring, which are typically able to withstand approximately 3000V peak. Two options of varistors are available. The half power option may withstand up to 10kJ of transient energy and the full power up to 20kJ. Figures 8 and 9 show P721/P791 and P723/P793 connection diagram. See P79x brochure for more information. A B C P791 Auxiliary supply _ WD RL1 RL2 RL3 RL Watch dog RL1 to RL4 are programmable outputs P791 L1 to 2 are programmable inputs L1 24 _ L2 _ MiCOM P721 Link terminals 30 and 32 if the relay is connected at the end of the RS485 bus * _ RS485 communication port Figure 8: MiCOM P721/P791 diagram connection Simple and reliable high impedance differential scheme protection

10 Protection Relays MiCOM P72x 08 A B C PROTECTED ZONE Three-Phase High Impedance Differential TC1 CT1 TC2 CT2 TCN CTN Auxiliary supply P793 P793 L1 to 5 are programmable inputs _ L1 _ L2 _ L3 _ L4 _ L5 _ WD RL1 RL2 RL3 RL4 RL5 RL6 RL7 RL8 MiCOM P723 (*) Link terminals 30 and 32 if the relay is connected at the end of the RS485 bus * _ Watch dog RL1 to RL8 are programmable outputs RS485 communication port Figure 9: MiCOM P723/P793 diagram connection Device Track Record - High Impedance Differential Protection MiCOM P12x series relays used in high-impedance applications since 1998 MiCOM P14X series relays used in high-impedance applications since 1999 Schneider Electric 35, rue Joseph Monier CS Rueil-Malmaison Cedex, France Tel: 33 (0) RCS Nanterre Capital social As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication. This document has been printed on ecological paper Publishing: Schneider Electric Design: Schneider Electric Printing: 2010 Schneider Electric - All rights reserved EnergyAutomation-DS-P72x-2200-EN

11 RATINGS Power Supply Nominal auxiliary voltage Vx Operating range Residual ripple Up to 12% Stored energy time Vdc/ Vac Vdc/ Vac DC: ± 20% of Vx AC: 20%, 10% of Vx 50 ms for interruption of Vx Burden Stand by: <3W DC or <8VA AC Max: <6W DC or <14VA AC Phase and earth current transformers consumption P72x phase CT consumption RMS voltage (V) phase transformer phase transformer Current (A) Frequency P72x earth CT consumption Frequency protection functions Nominal frequency 5Hz Nominal frequency 50/60 Hz RMS voltage (V) earth transformer Current inputs earth transformer Phase current inputs 1 and 5 A by connection Current (A) Earth current inputs 1 and 5 A by connection Operating range Burden Phase Current Burden Earth Current Thermal withstand Selected at order (Cortec) < VA (1 A) < 0.3 VA (5 A) < 0.08 VA (1 A) < 0.42 VA (5 A) x rated current 2 40 x rated current 4 x rated current Logic inputs Logic input type Logic input burden Logic input recognition time (DC inputs) Logic input recognition time (AC inputs) Independent optically insulated < 10 ma per input < 5 ms in a 50 Hz system < 4 ms in a 60 Hz system <7 ms in a 50 Hz system < 6 ms in a 60 Hz system Logic input recognition time (ENA inputs) <15 ms in a 50 Hz system < 12 ms in a 60 Hz system P721 P723 Technical DataSheet 9 P72x/EN TDS/B21

12 Supply Output Relay Characteristic Ordering Code Relay auxiliary power supply Nominal Operating voltage range voltage range Vx Nominal Voltage range A* 24 60Vdc 19,2 76Vdc Vdc F* Vdc Vdc Vac Vac Vac T H V W Z Vdc Vac Special EA Vdc Vac Vdc Vac Vdc Vac Vdc Vac Vdc Vdc Vac Vac Logic Inputs Minimal Maximum polarisation polarisation voltage current Holding current after 2ms 19.2Vdc 19.2Vac 35mA 2.3mA 19.2Vdc 19.2Vac 35mA 2.3mA Maximum continuou s withstand 300Vdc 264Vac 300Vdc 264Vac Vdc Vac 129Vdc 105Vdc Vdc 145Vdc Vdc Vac 110Vdc 77Vdc Vdc 132Vdc Vdc Vac 220Vdc 154Vdc Vdc 262Vdc 19,2 300Vdc Vdc 38,2 264Vac Vac 19.2Vdc 19.2Vac 35mA 2.3mA ( * ) Ordering code (Cortec) options A and F are not available for sale ( ** ) Logic input recognition time for EA approval. Dedicated filtering on 24 samples (15ms at 50Hz). 300Vdc 264Vac Contact rating Contact relay Make current Carry capacity Rated Voltage Breaking characteristic Breaking capacity AC Breaking capacity DC Operation time Durability Loaded contact Unloaded contact Dry contact Ag Ni Max. 30 A and carry for 3s 5 A continuous 250 Vac 1500 VA resistive 1500 VA inductive (P.F. = 0.5) 220 Vac, 5 A (cos = 0.6) 135 Vdc, 0.3 A (L/R = 30 ms) 250 Vdc, 50W resistive or 25 W inductive (L/R=40 ms) <7 ms operation minimum operation minimum TYPICAL OPERATING TIMES The typical operating times for Restricted earth fault and balanced earth fault (REF/BEF) applications are shown in Figure 1. To determine the typical operating times the current levels considered were 1In, 5In, 10In and 20In and the point on wave was varied from 0 to 150 in steps. The tests were performed considering [87N] Threshold I Diff set to 0.5In and 0.1In and [87N] Measurement Filter set to Fourier, Sample and Fast Sample time (s) multiple of setting (xisetting) fourier fast sample Figure 1 Typical operating times REF/BEF applications P721 P723 Technical DataSheet 10 P72x/EN TDS/B21

13 The typical operating times for busbar applications are shown in Figure 2, Figure 3 and Figure 4. To determine the typical operating times the current levels considered were 5In, 10In, 25In and 50In and the point on wave was varied from 0 to 150 in 30 steps. The tests were performed considering [87] Threshold I Diff set to 0.5In and 0.1In and [87] Measurement Filter set to Fourier, Sample and Fast Sample. Single Phase Fault typical operating time (s) multiple of setting (xisetting) Fourier Fast Sample Sample Figure 2 Typical operating times Single phase faults Busbar applications P721 P723 Technical DataSheet 11 P72x/EN TDS/B21

14 Phase to Phase Faults typical operating time (s) multiples of setting (xisetting) Fourier Fast Sample Sample Figure 3 Typical operating times Phase to phase faults Busbar applications Three Phase Faults typical operating time (s) multiples of setting (xisetting) Fourier Fast sample Sample Figure 4 Typical operating times Three phase faults Busbar applications P721 P723 Technical DataSheet 12 P72x/EN TDS/B21

15 INSULATION Dielectric withstand IEC : kv common mode 1 kv differential mode ANSI/IEEE C (reaffirmed 1994) 1.5 kv rms AC for 1 minute, across normally open contacts. Impulse voltage IEC : 2000 Insulation resistance IEC : kv common mode 1 kv differential mode > 1000 M EMC TESTS High Frequency Disturbance IEC : kv common mode, Class III 1 kv differential mode, Class III Electrostatic Discharge EN : 1995 and IEC : kv contact discharge, Class 4 15 kv air discharge, Class 4 Fast Transient IEC :2002, Class A 2 kv 5 khz, terminal block comms. 4 kv 2.5 khz, all circuits excluding comms. EN :1995, Level 4 4 kv 5 khz, power supply 2 kv 5 khz, all circuits excluding power supply Surge EN :1995 and IEC : kv common mode, Level 4 2 kv differential mode, Level 4 Conducted Emissions EN 55022: MHz, 79 dbµv (quasi peak) 66 dbµv (average) MHz, 73 dbµv (quasi peak) 60 dbµv (average). Radiated Emissions EN 55022: MHz, 40 dbµv/m at 10 m measurement distance GHz, 47 dbµv/m at 10 m measurement distance. Conducted Immunity EN :1996 Level 3, 10 V 1 khz 80% am, 150 khz to 80 MHz Radiated Immunity EN :2002 ANSI/IEEE C :2004 Level 3, 10 V/m 80 MHz to 1 1 khz 80% am 35 V/m 80 MHz to 1 1 khz 80% am 35 V/m 80 MHz to 1 100% pulse modulated front face only. Radiated immunity from digital telephones EN :2002 ANSI Surge Withstand Capability IEEE/ANSI C : 2002 Magnetic Field Immunity IEC : 1994 IEC : 1993 IEC : 1993 Level 4, 30 V/m 800 MHz to 960 MHz and 1.4 GHz to 2 1 khz 80% am 4 kv fast transient and 2.5 kv oscillatory applied common mode and differential mode Level 5, 100 A/m applied continuously, 1000 A/m for 3 s. Level 5, 1000 A/m. Level 5, 100 A/m at 100 khz and 1 MHz. ENVIRONMENT Temperature IEC : 1993 Storage 25 C to 70 C IEC : 1993 Operation: 25 C to 55 C 25 C to 70 C (*) (*) The upper limit is permissible for a single 6 hour duration within any 24 hour period. Humidity damp heat IEC : days at 93% RH and 40 C Enclosure protection IEC : 2001 Dust IP50 (whole case), Front IP 52, Back IP 10 Sinusoidal Vibrations IEC :1998 Response and endurance, class 2 Shocks IEC :1998 Response and withstand, class 2 Shock withstand & Bump IEC :1998 Response and withstand, class 1 Seismic IEC :1993 Class 2 Corrosive Environments : Per IEC : 1995, Part 2, Test Ke, Method (class) 3 Industrial corrosive environment/poor environmental control, mixed gas flow test. 21 days at 75% relative humidity and 30 C Exposure to elevated concentrations of H²S, NO², Cl² and SO². P721 P723 Technical DataSheet 13 P72x/EN TDS/B21

16 EU DIRECTIVE EMC compliance 89/336/EEC 93/31/EEC Compliance with European Commission EMC Directive. Generic standards were used to establish conformity: EN : 1994 EN : 1995 Product safety 2006/95/EC (replacing 73/23/EEC from 01/2007) Compliance with European Commission Low Voltage Directive. Compliance is demonstrated by reference to generic safety standards: EN : 1993/A2: 1995 EN60950: 1992/A11: 1997 DEVIATION OF PROTECTION ELEMENTS Element Range Deviation Fault timer Reset timer Earth differential protection I diff (V diff) Phase differential protection I diff (V diff) Earth bus-wire supervision Phase bus-wire supervision I Sup (V Sup) 0.01In to 1In (0.5 to 200 V) 0.02 to 2In (1 to 400 V) 0.01 to 1 In (0.5 to 200 V) 0.02 to 2In (1 to 400 V) 2% 0 s 2 s 0 to 600 s 2% 0 s 2 s 0 to 600 s 2% 0.5 s 3 s 0 to 600 s 2% 0.5 s 3 s 0 to 600 s DEVIATION OF AUTOMATION FUNCTIONS TIMERS CB fail & CB monitoring timers Auxiliary timers taux1, taux2, taux3, taux4 2% 0-10 s 2% s DEVIATION OF MEASUREMENTS Measurement Range Deviation Phase current 0.02In to 10In Typical 0.5% at In Earth current 0.004In to 2In Typical 0.5% at In PROTECTIONS FUNCTIONS Settings [87N] Earth differential protection [87N] Earth differential protection [87N] Threshold I diff [87N] Threshold V diff [87N] Filter timer t Diff [87N] Reset timer treset Measurement Filter [95N] Earth bus-wire supervision [95N] Earth bus-wire supervision [95N] Threshold I sup [95N] Threshold V sup [95N] Filter timer t sup [95N] Reset timer treset Measurement Filter Yes / No 0.01In to 1In 0.5 V to 200 V 0 s to 2 s 0 to 600 s Sample mode Fast sample mode Fourier mode Yes / No 0.01In to 1In 0.5 V to 200 V 0.5 s to 3 s 0 to 600 s Sample mode Fast sample mode Fourier mode [87] Phase differential protection (P723 only) [87] Phase differential protection Yes / No [87] Threshold I diff 0.02In to 2In [87] Threshold V diff 1 V to 400 V [87] Filter timer t Diff 0 s to 2 s [87] Check zone Yes / No [87] Reset timer treset 0 to 600 s Measurement Filter Sample mode Fast sample mode Fourier mode [95] Phase bus-wire supervision (P723 only) [95] Phase bus-wire supervision Yes / No [95] Threshold I sup 0.02In to 2In [95] Threshold V sup 0.5 V to 400 V [95] Filter timer t sup 0.5 s to 3 s [95] Check zone Yes / No [95] Reset timer treset 0 to 600 s Measurement Filter Sample mode Fast sample mode Fourier mode P721 P723 Technical DataSheet 14 P72x/EN TDS/B21

17 Automation and accessory functions Trip command Assignation of the following thresholds to trip output relay: all models: [87N] tdiff, t Aux 1, t Aux 2, Control Trip, tequ.a, tequ.b, tequ.c, tequ.d, tequ.e, tequ.f, tequ.g, tequ.h, P723 additional functions: [87] tdiff, t Aux 3 and t Aux 4 Latch functions Trip output relay programmable with one or many thresholds: all models: [87N] tdiff, t Aux 1, t Aux 2, Control Trip, tequ.a, tequ.b, tequ.c, tequ.d, tequ.e, tequ.f, tequ.g, tequ.h. P723 additional functions: [87] tdiff, t Aux 3, t Aux 4. Blocking logic Possibility to block the following delayed thresholds: all models: [87N] tdiff, t Aux 1, t Aux 2, P723 additional functions: [87] tdiff, t Aux 3 and t Aux 4. Output relays Alarm and trip threshold assignation to a logic output: 3 relays (P721) and 7 relays (P723). Assignable functions: all models: [87N] Diff, [87N] tdiff, [95N] Sup, [95N] tsup, Buswire Short, CB Fail, t Aux 1, t Aux 2, Active group, Control trip, Input1, Input2, tequ. A, tequ. B, tequ. C, tequ D, tequ E, tequ. F, tequ. G, tequ. H. P723 additional functions: [87] Diff, [87] tdiff, [87CZ] ChkZone, [95] Sup, [95] tsup, [9] tsup A, [95B] tsup B, [95C] tsup C, t Aux 3, t Aux 4, Input3, Input4, Input5 Latch of the auxiliary output relays Possibility to latch output relays: P721: Output 2 to 4 P723: Output 2 to 8 Inputs Inputs assignation Single function or multiple automation functions assignable to 4 logic inputs: all models: Unlatch, Aux 1, Aux 2, Blocking Logic 1, Blocking Logic 2, Start Disturb, Change setting, Reset LEDs, Maint. Mode, Local Mode, Synchro P723 additional functions: Aux 3, Aux 4, [87CZ] Chk Zone Auxiliary timers: Aux1 time taux1 0 to 200s Aux2 time taux2 0 to 200s Aux3 time taux3 0 to 200s Aux4 time taux4 0 to 200s Circuit Breaker Failure CB Fail Setting Ranges: CB Fail? Yes / No I Diff < 0.01 In to 1 In V Diff < 0.5 v to 200 V CB Fail Time tbf 0 to 10s Logic Equations The MiCOM P721 and P723 relays integrate complete logic equations to allow customization of the product based on customer application. Up to 8 independent Boolean equations can be used (from A to H). Every result of equation can be time delayed and assigned to any output relays, trip, trip latching and/or HMI LEDs. Up to 16 operands can be used (from 00 to 15). Within operands, there are two parts: (1/2) : logical gates (NOT, OR, AND, NOT AND, NOT OR) (2/2) : signals ([87N] Diff, [95N] tsup, taux, input etc) Timer Setting Ranges EQU. A to H Toperat 0 to 600 s EQU. A to H Treset 0 to 600 s Available logical gates: NOT Logical gates OR (by default) AND AND NOT OR NOT Available signals: Text Signals (2/2) Availability (1/2) A00, B00, C00, D00, E00, F00, G00, H00 A01 to A15, B01 to B15, C01 to C15, D01 to D15, E01 to E15, F01 to F15 G01 to G15, H01 to H15 P721 and P723: Null Condition is Null Not Null Condition is not Null [87N] Diff Earth differential protection threshold [87N] tdiff Time delayed earth differential protection threshold [95N] tsup Time delayed earth high impedance differential threshold (buswire supervision) taux 1 Copy of the status of the Logic Input taux 1 taux 2 Copy of the status of the Logic Input taux 2 Input 1 Instantaneous digital input 1 Input 2 Instantaneous digital input 2 Group 2 Group 2 is active (setting) CB Fail Circuit Breaker does not operate P723 only: [87] Diff Phase differential protection threshold [87] tdiff Time delayed phase differential protection threshold [87CZ] Check zone Check Zone status [95] Sup Phase high impedance differential threshold (buswire supervision) [95N] Sup Earth high impedance differential threshold (buswire supervision) [95] tsup Time delayed phase high impedance differential threshold (buswire supervision) [9] tsupa Time delayed phase A (or L1, or R) high impedance differential threshold (buswire supervision) [95B] tsupb As above for phase B (or L2 or S) [95C] tsupc As above for phase C (or L3 or T) Buswire Short Buswires short-circuited taux 3 Copy of the status of the Logic Input taux 3 taux 4 Copy of the status of the Logic Input taux 4 Input 3 Instantaneous digital input 3 Input 4 Instantaneous digital input 4 Input 5 Instantaneous digital input 5 P721 P723 Technical DataSheet 15 P72x/EN TDS/B21

18 RECORDING FUNCTIONS Fault Record Capacity Time-tag Triggers Data 25 faults 1 millisecond Instantaneous recorder Any selected protection alarm and threshold Fault date, Active setting Group, Faulted phase, Threshold, Fault magnitude, [87] tdiff fault (tripping) [87N] tdiff fault (tripping) taux 1 fault (tripping) taux 2 fault (tripping) taux 3 fault (tripping) taux 4 fault (tripping) tequation A, B, C, D, E, F, G and H fault (tripping) Control trip Disturbance Records Triggers; Data; Setting Ranges Triggers Data Any selected protection alarm and threshold, logic input, remote command AC input channels digital input and output states frequency value Default value Setting range P72x Min Max Step Pre-Time 1.0 s 0.1 s 3 s 0.1 s Post-Time 2.0 s 0.1 s 3 s 0.1 s Disturb rec Trig Trigger ON INST ON TRIP or ON INST. Any selected protection alarm and threshold Logic input Remote command Capacity Time-tag Triggers Data 5 starting items of information (instantaneous) 1 millisecond Any selected protection alarm and threshold date, hour origin (any protection alarm) length (duration of the instantaneous trip yes or no Communications Type Port Relay position Physical Link Connectors Data Rate Protocol RS485 Rear port Screened twister pair RS232 Front port Screened twister pair Screws or snapon Sub D 9 pin female connector 300 to baud (programmable) 300 to baud (programmable) ModBus RTU, Courier, IEC , DNP3.0 ModBus RTU P721 P723 Technical DataSheet 16 P72x/EN TDS/B21

19 DIMENSIONS P721 and P723: External size: Height case 152 mm front panel 177 mm Width case 97 mm front panel 103 mm Depth case 226 mm front panel case 252 mm P0078ENb Figure Dimensional drawings P721 P723 Technical DataSheet 17 P72x/EN TDS/B21

20 WIRING CONNECTIONS Typical application diagram P A C B Phase rotation Auxiliary voltage WD Case earth RL1 RL2 RL3 RL Alternative : Restricted Earth Fault Protection (Delta connection) A B C RSt A B C P791 stabilising resistors Alternative : Restricted Earth Fault Protection ( Star connection) Ctrl shorting relay P791 (-V) Auxiliary voltage (-V) Auxiliary voltage P791 RSt Watch dog (4) Programmable tripping output Programmable output Ctrl shorting relay Module terminal blocks viewed fromp rear (with integral case earth link) (V)Auxiliary voltage Programmable output MiCOM P721 Programmable input Programmable input L1 L2 * ( : Link terminals 30 and 32 if the relay is connected at the end of the RS485 bus ) * Case earth connection Port communication RS 485 Nota : (1) (a) (b) (c) (d) CT shorting links make before (b) and (c) disconnect (2) CT connection are typical only Short terminals break before (c) (3) Earth terminals are typical only Long terminals Pins terminals (pcb type) (4) The MICOM P120/P121 relays are shown with supply off P3955ENa P721 P723 Technical DataSheet 18 P72x/EN TDS/B21

21 Typical application diagram P723 Alternative : Restricted Earth Fault Protection ( Star connection) Alternative : Restricted Earth Fault Protection (Delta connection) Terre boîtier Case earth Nota : (1) (a) Module terminal blocks viewed fromp rear (with integral case earth link) CT shorting links make before (b) and (c) disconnect (b) (c) (d) Short terminals break before (c) Long terminals Pins terminals (pcb type) (2) CT connection are typical only (3) Earth terminals are typical only (4) The MICOM relays are shown with supply off. Auxiliary voltage Programmableinput Programmableinput Programmableinput Programmable input Programmable input Three-Phase High Impedance Differential L1 L2 L3 L4 L5 MiCOM P723 * RL7 RL8 ( : Link terminals 30 and 32 if the relay is connected at the end of the RS485 bus ) * Case earth connection Port communication RS A B C Ctrl shorting relay (-V) Auxiliary voltage P A B C A Auxiliary voltage (-V) C B Phase rotation P793 P791 and P793 stabilising resistors WD 36 RL1 RL2 RL3 RL4 RL5 RL Watch Dog (4) Programmable tripping output Programmable output Ctrl shorting relay (V)Auxiliary voltage Programmable output Programmable output Programmable output Programmable output Programmable output CT1 CT2 CTn RSt. Ctrl shorting relay (-V) Auxiliary voltage P791 RSt. 49 RSt. RSt. RSt. P3954ENa P721 P723 Technical DataSheet 19 P72x/EN TDS/B21

22 ORDERING OPTIONS Information Required with Order Relay Type (differential protection) P Variant Simple phase high impedance differential protection Simple phase or three phase high impedance protection with binary I/O extension Auxiliary and digital input voltage Auxiliary voltage digital input voltage Vdc / Vac Vdc / Vac Vdc / Vac Vdc / Vac Vdc / Vac Rear port communication interface Modbus K-Bus/Courier IEC DNP 3.0 Default HMI language French English / American Spanish German Italian Portuguese Platform Vdc (1) Vdc (ENA UK) 110 Vdc 30% / 20% (1) 220 Vdc 30% / 20% (1) Vdc / 24 / 240 Vdc phase 2 with standard software 2 Software Unless specified the latest version will be delivered Mounting option None (default) (2) Pre-fixed HMI (no withdrawability) Sealed cover (2) Pre-fixed HMI Sealed cover (1) : special application (2) : : not available 1 3 H T V W Z P721 P723 Technical DataSheet 20 P72x/EN TDS/B21

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24 Schneider Electric 35 rue Joseph Monier Rueil-Malmaison FRANCE Phone: 33 (0) Fax: 33 (0) Publishing: Schneider Electric Publication: P72x/EN TDS/B21 03/ Schneider Electric. All rights reserved.