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More protection : Independent phase and earth

overcurrent functions. 3 phase overcurrent thresholds.

3 earth overcurrent thresholds. 11 families of curves (IEC,IEEE/ANSI, Electromechanical).

Blocking logic. Instantaneous units.

More information : True RMS measurement (up to

10th harmonic). Alarm and trip messages in

selectable language.

Applications Industrial electrical networks. Utilities. HV & MV substations. MV & LV transformers.

Protection and control 3 independent phase.

overcurrent thresholds (50/51). 3 independent earth.

overcurrent thresholds(50N/51N).

11 families of curves (IDMT)

(5 x CEI, 5 x IEEE/ANSI, 1 RI). Blocking logic. Start contacts. Output relay latching (86)

Inputs and outputs 3 phase current inputs. 1 earth current input. Dual rated 1 & 5 Amp CT

inputs. 2 programmable logic inputs. 5 programmable logic outputs.

Measurements True RMS phase & earth

currents. Permanent self-test. Fault memorisation and display.

User interface 8 leds including

4 programmables. 32 character alphanumeric

display. RS 485 rear connection. MODBUSTM Courier or

IEC 60870-5-103communication.

Drawout case.

MiCOM P 121Phase and earth overcurrent protection

MiCOM P121 is the universal phase and earth overcurrent andoverload relay. Advanced functions allow maximum performance atan optimised cost.

More convenient : Dedicated messages. Programmable leds.

More compatible : MODBUSTM, Courier or IEC60870-5-103 communicationprotocols.

Drawout case with CT shortcircuits.

Dual rated 1 and 5 Amp CTinputs.

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Current inputs

Phase current range : 1 and 5 Amp

burden : < 0.3 VA (5 A) overload withstand :

1 second @ 100 x rated current ;2 seconds @ 40 x rated currentcontinuous @ 3 x rated current

Earth current range : 1 and 5 Amp burden : < 0.01 VA at 0.1IE (5A) overload withstand :

1 second @ 100 x rated current ;2 seconds @ 40 x rated currentcontinuous @ 3 x rated current

SettingsPhase time overcurrent thresholds : 3 (I>, I>>, I>>>) ranges : from 0.1 to 40 x rated

current I> IDMT curves :

IEC 255-3 : STI, SI, VI, EI, LTIIEEE/ANSI : MI, VI, EI, CO2,CO8Electromecanical : RI

instantaneous time :(I>, I>>, I>>>) < 30 ms

time delay :

(tI>, tI>>, tI>>>) from 0 to 150 s dropout time : 50 ms

Earth time overcurrent thresholds : 3 (IE>, IE>>, IE>>>) ranges : from 0.002 to 8 x rated

current

IE> IDMT curves :IEC 255-3 : STI, SI, VI, EI, LTIIEEE/ANSI : MI, VI, EI, CO2,

CO8Electromechanical : RI instantaneous time :

(IE>, IE>>, IE>>>) < 30 ms time delay :

(tIE>, tIE>>, tIE>>>) from 0 to 150 s dropout time : 50 ms

Auxiliary supply ranges : 24 to 250 Vdc

110 to 250 Vac ;50/60 Hz

burden :< 2 W + 0.25 W per logicoutput,

< 5 VA with AC voltage supply variations : 0.8 to 1.2 Uaux DC supply interruption : 50 ms

Logic inputs 2 isolated programmable inputs range : 24 to 250 Vdc burden : 0.25 W per input

Logic outputs 2 change-over programmable

outputs 2 N/O programmable outputs 1 watch-dog output current : make and carry for

0.2 s ; 30 Acarry continuously 5 A

break :at 135 Vdc (L/R = 30ms) ; 0.3 Aat 220 Vac (50/60 Hz) ;cos = 0.6 ; 5 A

T&D Protection & Contrle - 95, rue de la Banquire - BP 75 - 34975 Lattes Cedex FRANCE

Tl : 33 (0)4 67 20 54 54 - Tlex : 485 093 F - Fax : 33 (0)4 67 20 54 99 - E-mail: protection.controle@tde.alstom.com

5051

50N51N

52 TRIP

WD

Logicinputs

Logicoutputs

Phase CTs

P121

RS 485Communication

3

Earth CT

Busbar

86

Remotecontrol

L11501B-02/99

Technical specifications

Communication type : RS485 2 wires, half

duplex, isolated

data rate : from 300 to 38 400bauds protocol : MODBUSTM RTU

Courier or IEC 60870-5-103

Housing case : MiCOM 20 TE, rack or

flush mounting, rear connections,full drawout with automatic CTshorting

case size : 4U (152mm)H x 103 mm W x 230 mm D

protection : IEC 529 ; IP 52,IK 07

weight : 1.9 Kg connectors : MIDOS 2 x28 points (double faston + M4screw per connection)

HMI display : 2 x 16 alphanumeric

characters, back-lit leds : 8 including

4 programmables keyboard : 7 button tactile key-

pad languages : French, English,

Dutch, German, Spanish,

Portuguese, Italian, American,Russian, Polish

Environment temperature : IEC 255-6

operating : - 25C to +55Cstorage : - 25C to +70C

humidity : IEC 68-2-3 dielectric withstand : IEC 255-5 impulse voltage : IEC 255-5 fast transient : IEC 1000-4-4;

ANSI C37.90.1 high frequency disturbance :

IEC 1000-4-1 class 3 RFI : IEC 1000-4-3 ;

ANSI C37.90.2 electrostatic discharge: IEC 100-4-2 auxiliary supply : IEC 255-11,

VDEW ; ripple : 12%,supply interruption : 50 ms

vibration : IEC 255-21-1 class 2 shock & bump : IEC 255-21-1

class 1 seismic : IEC 255-21-3 class 1

StandardsCE conformity to IEC 947-1 (EMC

and LV directives)ARCEAUX49Imp.-Tl.04992325

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