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MiCOM P721 & P723

High Impedance Differential Protection

P72x/EN TDS/B21

Technical Data Sheet This document does not replace the Technical Manual

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.

01Protection Relays

MiCOM P721 & P723Numerical 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.

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.

Customer Benefits

•Simple scheme engineering

•Reliable algorithm

•Supervision functions included in the

same protection box

02Protection Relays MiCOM P72x

APPLICATION

When circulating current protection schemes aresubjected to through faults, the sudden and oftenasymmetrical 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.

OVERVIEW

Two models are available:MiCOM P721 is a single-phase high impedancedifferential protection. It is suitable for restricted earth fault or balanced earth fault applications.

MiCOM P723 can be configured either as highimpedance 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 accessoryas shown in Figure 1.

Stability for any type of fault occurring outside theprotected 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.

fuNCTIONAL OVERVIEW

87P

P79x

RST

ProtectedPlant

P72x

Metrosil

I diff

BinaryInput / Output

LEDs

87N

95P

95N

50BF

Disturbance

Measurements

Self Monitoring

Fault RecordsLocalCommunication

RemoteComm. Port Record

P72x and P79x together offer a simple and reliable high impedance differential protection


PROTECTION fuNCTIONS OVERVIEW

ANSI features P721 P72387P 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 P723Number of opto-isolated inputs 2 5Number of relay output contacts 4 8Event recording 250 250Fault recording 25 25Disturbance recording 5 5Instantaneous records 5 5Setting groups 2 2Auxiliary timers 4 4Communication protocols Modbus RTU (rear port) • •

DNP3 (rear port) • •IEC 60870-5-103 (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


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.

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 logicequations 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, triplatching and/or HMI LEDs.

Figure 2: BEF protection for the delta winding of a power transformer with supply system earthed

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

Figure 4: General scheme of the three-phase high impedance differential protection

[87] DIFF

&

[87CZ] Check Zone

Blocking Logic 1 / 2 DT

Start [87] DIFF

Temporized [87] tDIFF

[95] SUPStart [95] SUP

Temporized [95] tSUP

DT

&

Figure 5: General scheme of high impedance differential earth fault protection

[87N] DIFF

&Blocking Logic 1 / 2

DT

Start [87N] DIFF

Temporized [87N] tDIFF

[95N] SUP Start [95N] SUP

Temporized [95N] tSUP

DT


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 tomonitor for a continuous low level of spill current.After a time delay, this relay would usually shortcircuit 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 checkzones) 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 inconjunction with each other, although to reduce costs either scheme could be used independently.

Optos

Protectionelements

AutomaticControl

Timers

Gate Logic

LED's

Relaycontacts

Figure 6 CBF detection logic

Trip [87] tDIFF

Idiff<

&

CB Fail time tBF

CB Fail

Pick up timer

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.

Phase segregated outputs are available from the buswire supervision such that each phase can be“stabilised” by short circuiting the bus-wires asrequired. The differential elements are internallyblocked due to bus-wire supervision (although this will not negate the requirement for external shorting of bus-wires).

Bus-wire Shorting

To limit the power dissipated in the resistance, after the differential trip protection [87] or bus-wiresupervision [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.

OPERATION AND CONfIGuRATION

Setting groupsExternal 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 beprogrammed 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-downstructure 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.


MEASuREMENTS AND RECORDING

Measurements

The following measurements are available for display and remote measurements:• The P723 measures Phase supervision/

differential currents (IAdiff, IBdiff and ICdiff).

Figure 7: Disturbance Record

• The P721 and P723 measure the neutral supervision/differential currents (INdiff).

• The P723 measures the maximum differential currents (ImaxAdiff, ImaxBdiff and ImaxCdiff).

• The P721 and P723 measure the maximum differential neutral currents (ImaxNdiff).

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. Inaddition, the disturbance recorder can be triggered by an opto-isolated input, or a remote control signal.

Up to five records of 3 seconds each one can bestored.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 beaccessed either locally or remotely.

Read Keyclear Key

trip led

Alarm led

Device fail.

Power supply

battery is not used anymore

cursor Keys

Rs 232

freely Programmable leds


COMMuNICATION & SYNCHRONIZATION

The MiCOM P72x offers a wide range ofcommunication protocols, allowing its utilisation in most of the network control and data acquisitionsystems (via Modbus, IEC 60870-5-103, 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 port2. Synchronization from an external GPS clock via a dedicated digital input

STABILISING RESISTOR AND VARISTOR ACCESSORY

The P79x accessory contains a number of fixedresistors that provide stability during external faults. In addition to the stabilising resistors, a varistor is included for each phase.

Figure 8: MiCOM P721/P791 diagram connection

373533+

_34

36WDWatch dog

RL1 to RL4 areprogrammableoutputs

L1 to 2 areprogrammableinputs

Auxiliarysupply

ABC

P791

Link terminals 30 and 32if the relay is connectedat the end of the RS485bus

RS485communicationport

+

_

642RL1

1210

8RL2

1614RL32018RL4

551A

56

47

MiCOMP721

5A48

2224

+

_

*31

30

29

32

L1+

_

2628 L2

P791

Simple and reliable high impedance differential scheme protection

Two models are available: the P791 used in singlephase applications and the P793 used in three phase applications.

Stabilising resistor

Three options of internal stabilising resistors areoffered. In each option is possible to get 4combinations 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/P793connection diagram. See P79x brochure for more information.

08

EnergyAutomation-DS-P72x-2200-EN 10-2010

Protection Relays MiCOM P72x

© 2

010

Sch

neid

er E

lect

ric -

All

right

s re

serv

ed

As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication.

Publishing: Schneider ElectricDesign: Schneider ElectricPrinting:

This document has been printed on ecological paper

Schneider Electric35, rue Joseph Monier CS 30323 92506 Rueil-Malmaison Cedex, France Tel: +33 (0) 1 41 29 70 00

RCS Nanterre 954 503 439 Capital social 896 313 776 €www.schneider-electric.com

Figure 9: MiCOM P723/P793 diagram connection

33+

_34

Auxiliarysupply

Three-Phase High Impedance Differential

373536WD

Watch dog

RL1 to RL8 areprogrammableoutputs

642RL1

12108RL2

1614RL32018RL4

31RL575RL69

11RL71315RL8

RS485communicationport

+

_

*31

30

29

32

L1 to 5 areprogrammableinputs

_

2224 L1+

_

2628 L2

(*) Link terminals 30 and 32 if the relay is connected at the end of the RS485 bus

MiCOMP723

491A

5051

1A5253

1A5455

1A5641

5A4243

5A4445

5A4647

5A48

P793

PROTECTED ZONE

TC1

CT1

P793

TC2

CT2

TCN

CTN

CBA

_

1719 L3+

_

2123 L4

+

_

2527 L5

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

P721 – P723 Technical DataSheet 9 P72x/EN TDS/B21

RATINGS

Power Supply

Nominal auxiliary voltage Vx

48 -250 Vdc/ 48-240 Vac 24-250 Vdc/ 48-240Vac

Operating range DC: ± 20% of Vx AC: – 20%, +10% of Vx

Residual ripple Up to 12%

Stored energy time

50 ms for interruption of Vx

Burden Stand by: <3W DC or <8VA ACMax: <6W DC or <14VA AC

Frequency

Frequency protection functions

Nominal frequency 5Hz

Nominal frequency 50/60 Hz

Current inputs

Phase current inputs

1 and 5 A by connection

Earth current inputs

1 and 5 A by connection

Operating range Selected at order (Cortec)

Burden Phase Current

< 0.025 VA (1 A) < 0.3 VA (5 A)

Burden Earth Current

< 0.08 VA (1 A) < 0.42 VA (5 A)

Thermal withstand

1 s @ 100 x rated current 2 s @ 40 x rated current continuous @ 4 x rated current

Phase and earth current transformers consumption

P72x phase CT consumption

phase transformer 5A

RM

S v

olta

ge (

V)

Current (A)



RM

S v

olta

ge (

V)

Current (A)


P72x earth CT consumption

earth transformer 5A

RM

S v

olta

ge (

V)

Current (A)



RM

S v

olta

ge (

V)

Current (A)


Logic inputs

Logic input type Independent optically insulated

Logic input burden < 10 mA per input

Logic input recognition time (DC inputs)

< 5 ms in a 50 Hz system < 4 ms in a 60 Hz system

Logic input recognition time (AC inputs)

<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


Supply

Relay auxiliary power supply Logic Inputs

Ord

erin

g C

ode

Nominal voltage range

Vx

Operating voltage range

Nominal Voltage range

Minimal polarisation

voltage

Maximum polarisation

current

Holding current

after 2ms

Maximum continuou

s withstand

A* 24–60Vdc 19,2–76Vdc

F* 48–250Vdc 48–240Vac

38.4–300Vdc 38.4–264Vac

24–250Vdc 24–240Vac

19.2Vdc 19.2Vac

35mA

2.3mA

300Vdc264Vac

T 48–250Vdc 48–240Vac Special EA

38.4–300Vdc 38.4–264Vac

24–250Vdc 24–240Vac

19.2Vdc 19.2Vac

35mA

2.3mA

300Vdc264Vac

H 48–250Vdc 48–240Vac

38.4–300Vdc 38.4–264Vac

129Vdc

105Vdc

3.0 mA @ 129Vdc

145Vdc

V 48–250Vdc 48–240Vac

38.4–300Vdc 38.4–264Vac

110Vdc

77Vdc

7.3 mA @ 110Vdc

132Vdc

W 48–250Vdc 48–240Vac

38.4–300Vdc 38.4–264Vac

220Vdc

154Vdc

3.4 mA @ 220Vdc

262Vdc

Z 24–250Vdc 48–250Vac

19,2–300Vdc 38,2–264Vac

24–250Vdc 24–240Vac

19.2Vdc 19.2Vac

35mA

2.3mA

300Vdc264Vac

(*) 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).

Output Relay Characteristic

Contact rating

Contact relay Dry contact Ag Ni

Make current Max. 30 A and carry for 3s

Carry capacity 5 A continuous

Rated Voltage 250 Vac

Breaking characteristic

Breaking capacity AC 1500 VA resistive 1500 VA inductive (P.F. = 0.5) 220 Vac, 5 A (cos = 0.6)

Breaking capacity DC 135 Vdc, 0.3 A (L/R = 30 ms)250 Vdc, 50W resistive or 25 W inductive (L/R=40 ms)

Operation time <7 ms

Durability

Loaded contact 10000 operation minimum

Unloaded contact 100000 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 30

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.

0.000

0.010

0.020

0.030

0.040

0.050

0.060

0.070

0.080

0.090

0 10 20 30 40 50 60 70 80 90 100

multiple of setting (xIsetting)

tim

e (s

)

fourier fast sample

Figure 1 Typical operating times – REF/BEF applications


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

0.020

0.025

0.030

0.035

0.040

0.045

0.050

10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100

multiple of setting (xIsetting)

typ

ical

op

erat

ing

tim

e (s

)

Fourier Fast Sample Sample

Figure 2 Typical operating times – Single phase faults – Busbar applications


Phase to Phase Faults

0.0200

0.0250

0.0300

0.0350

0.0400

0.0450

10 20 30 40 50 60 70 80 90 100

multiples of setting (xIsetting)

typ

ical

op

era

tin

g t

ime

(s)

Fourier Fast Sample Sample

Figure 3 Typical operating times – Phase to phase faults – Busbar applications

Three Phase Faults

0.0100

0.0150

0.0200

0.0250

0.0300

0.0350

0.0400

10 20 30 40 50 60 70 80 90 100

multiples of setting (xIsetting)

typ

ical

op

era

tin

g t

ime

(s)

Fourier Fast sample Sample

Figure 4 Typical operating times – Three phase faults – Busbar applications


INSULATION

Dielectric withstand IEC 60255-5 : 2000 2 kV common mode 1 kV differential mode

ANSI/IEEE C37.90-1989 (reaffirmed 1994) 1.5 kV rms AC for 1 minute, across normally open contacts.

Impulse voltage IEC 60255-5 : 2000 5 kV common mode 1 kV differential mode

Insulation resistance IEC 60255-5 : 2000 > 1000 M

EMC TESTS

High Frequency Disturbance IEC 60255-22-1:1988 2.5 kV common mode, Class III 1 kV differential mode, Class III

Electrostatic Discharge EN 61000-4-2: 1995 and IEC 60255-22-2: 1996 8 kV contact discharge, Class 4 15 kV air discharge, Class 4

Fast Transient IEC 60255-22-4:2002, Class A 2 kV 5 kHz, terminal block comms. 4 kV 2.5 kHz, all circuits excluding comms.

EN 61000-4-4:1995, Level 4 4 kV 5 kHz, power supply 2 kV 5 kHz, all circuits excluding power supply

Surge EN 61000-4-5:1995 and IEC 60255-22-5:2002 4 kV common mode, Level 4 2 kV differential mode, Level 4

Conducted Emissions

EN 55022: 1998 0.15 - 0.5 MHz, 79 dBµV (quasi peak) 66 dBµV (average)

0.5 – 30 MHz, 73 dBµV (quasi peak) 60 dBµV (average).

Radiated Emissions

EN 55022: 1998 30 – 230 MHz, 40 dBµV/m at 10 m measurement distance

230 – 1 GHz, 47 dBµV/m at 10 m measurement distance.

Conducted Immunity

EN 61000-4-6:1996 Level 3, 10 V rms @ 1 kHz 80% am, 150 kHz to 80 MHz

Radiated Immunity

EN 61000-4-3:2002 ANSI/IEEE C37.90.2:2004

Level 3, 10 V/m 80 MHz to 1 GHz @ 1 kHz 80% am

35 V/m 80 MHz to 1 GHz @ 1 kHz 80% am

35 V/m 80 MHz to 1 GHz @ 100% pulse modulated front face only.

Radiated immunity from digital telephones

EN 61000-4-3:2002 Level 4, 30 V/m 800 MHz to 960 MHz and 1.4 GHz to 2 GHz @ 1 kHz 80% am

ANSI Surge Withstand Capability

IEEE/ANSI C37.90.1: 2002 4 kV fast transient and 2.5 kV oscillatory applied common mode and differential mode

Magnetic Field Immunity

IEC 61000-4-8: 1994 IEC 61000-4-9: 1993 IEC 61000-4-10: 1993

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 60068-2-1 : 1993 Storage –25 °C to +70 °C IEC 60068-2-2: 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 60068-2-78:2001 56 days at 93% RH and 40 °C

Enclosure protection IEC 60-529: 2001 Dust IP50 (whole case), Front IP 52, Back IP 10

Sinusoidal Vibrations IEC 60255-21-1:1998 Response and endurance, class 2

Shocks IEC 60255-21-2:1998 Response and withstand, class 2

Shock withstand & Bump IEC 60255-21-2:1998 Response and withstand, class 1

Seismic IEC 60255-21-3:1993 Class 2

Corrosive Environments : Per IEC 60068-2-60: 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.

EU DIRECTIVE

EMC compliance

89/336/EEC

93/31/EEC

Compliance with European Commission EMC Directive.

Generic standards were used to establish conformity: EN50081-2: 1994 EN60952-2: 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: EN61010-1: 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)

0.01In to 1In (0.5 to 200 V)

2% 0 s – 2 s 0 to 600 s

Phase differential protection I diff (V diff)

0.02 to 2In (1 to 400 V)

2% 0 s – 2 s 0 to 600 s

Earth bus-wire supervision

0.01 to 1 In (0.5 to 200 V)

2% 0.5 s – 3 s 0 to 600 s

Phase bus-wire supervision I Sup (V Sup)

0.02 to 2In (1 to 400 V)

2% 0.5 s – 3 s 0 to 600 s

DEVIATION OF AUTOMATION FUNCTIONS TIMERS CB fail & CB monitoring timers 2% 0-10 s

Auxiliary timers tAUX1, tAUX2, tAUX3, tAUX4

2% 0-200 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 Yes / No [87N] Threshold I diff 0.01In to 1In [87N] Threshold V diff 0.5 V to 200 V [87N] Filter timer t Diff 0 s to 2 s [87N] Reset timer tReset 0 to 600 s Measurement Filter Sample mode Fast sample mode Fourier mode

[95N] Earth bus-wire supervision

[95N] Earth bus-wire supervision Yes / No [95N] Threshold I sup 0.01In to 1In [95N] Threshold V sup 0.5 V to 200 V [95N] Filter timer t sup 0.5 s to 3 s [95N] Reset timer tReset 0 to 600 s Measurement Filter 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


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, [95A] 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:

Logical gates

Availability (1/2)

NOT A00, B00, C00, D00, E00, F00, G00, H00

OR (by default) AND AND NOT OR NOT

A01 to A15, B01 to B15, C01 to C15, D01 to D15, E01 to E15, F01 to F15 G01 to G15, H01 to H15

Available signals:

Text Signals (2/2)

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) [95A] 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


RECORDING FUNCTIONS Fault Record

Capacity 25 faults

Time-tag 1 millisecond

Triggers Any selected protection alarm and threshold

Data 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

Instantaneous recorder

Capacity 5 starting items of information (instantaneous)

Time-tag 1 millisecond

Triggers Any selected protection alarm and threshold

Data date, hour origin (any protection alarm) length (duration of the instantaneous trip yes or no

Disturbance Records Triggers; Data; Setting Ranges

Triggers Any selected protection alarm and threshold, logic input, remote command

Data 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

ON INST ON TRIP or ON INST.

Trigger Any selected protection alarm and threshold Logic input Remote command

Communications

Type Port

Relay position Physical Link Connectors Data Rate Protocol

RS485 Rear port Screened twister pair

Screws or snap-on

300 to 38400 baud (programmable)

ModBus RTU, Courier, IEC60870-5-103, DNP3.0

RS232 Front port Screened twister pair

Sub–D 9 pin female connector

300 to 38400 baud (programmable)

ModBus RTU


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


WIRING CONNECTIONS Typical application diagram P721

CB

29

RS

485

Nota

:(1

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(c)

(a)

(b)

30

32

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31- +

34

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26

28

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RL3

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55

53

49

51

37 45

43

41

39

35

33

29

31

48

56

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52

5038

46

44

4240

36

34

32

30

24

23

27

25

28

262

1 21

19

15

17

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20

16

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8 12

1064

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P3955ENa

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Typical application diagram P723

29

RS

48

5

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:(1

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(c)

(a)

(b)

30

32

*

31- +

34

P7

23

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53

49

51

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43

41

39

35

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29

31

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56

54

52

5038

46

44

4240

36

34

32

30

24

23

27

25

28

262

1 21

19

15

17

13

22

20

16

18

14

7 9 1153

8 12

1064

5A

5A

5A

5A

1A

1A

48

4746

45

44

43

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56

55

54

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50

51

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L3

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L5

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P3954ENa


ORDERING OPTIONS

Information Required with Order

Relay Type (differential protection) P72 0 0 0

Variant Simple phase high impedance differential protection

Simple phase or three phase high impedance protection with binary I/O extension

1

3

Auxiliary and digital input voltage

Auxiliary voltage digital input voltage

48-250 Vdc / 48-240 Vac48-250 Vdc / 48-240 Vac48-250 Vdc / 48-240 Vac48-250 Vdc / 48-240 Vac24-250Vdc / 48-240Vac

105-145 Vdc (1) 48-250 Vdc (ENA UK) 110 Vdc –30% / +20% (1) 220 Vdc –30% / +20% (1) 24-250 Vdc / 24 / 240 Vdc

H T V W Z

Rear port communication interface

Modbus K-Bus/Courier IEC 60870-5-103 DNP 3.0

1 2 3 4

Default HMI language

French English / American Spanish German Italian Portuguese

0 1 2 3 4 7

Platform

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

0123

(1) : special application (2) : : not available

Schneider Electric

35 rue Joseph Monier 92506 Rueil-Malmaison FRANCE

Phone: +33 (0) 1 41 29 70 00 Fax: +33 (0) 1 41 29 71 00

www.schneider-electric.com Publishing: Schneider Electric

Publication: P72x/EN TDS/B21 03/2012

2

012

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lect

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