The device includes the following components:

- Microprocessor relay MFP-5 (one for each feeder end)- Summation transformer TAS-5 (one for each feeder end)- Adjustable Pilots Padding Resistor Rpp (one for each feeder end)- Optional isolation transformer TAI-15 for increased pilots isolation level up to 15kV and pilots resistance up to 2500W.- Rated current in the pilot circuit 20 mA.- Stability on through faults up to 50 In.- Low burden on Feeder Cts.- Measurement of Feeder current- Differential current and Through current

Programmable Input Quantities

Fn = System frequency : (50 - 60) HzIn = Rated primary current of phase CTs : (0 - 9999)A, step 1ATAS = Ratio : (1 - 2) (2 Neutral TAPS)

F87 :

- Stability Factor : Ks = (0.1 - 1), step 0.1- Time Multiplier : Kt = (0.1 - 1), step 0.1- Pilot Compensation : KR = (0.5 - 2), step 0.1- Pilots Supervision : K/KR = (0.5 - 2), step 0.1

50/51, 87/85· High Sensitivity· High Speed· High Stability with automatic Bias· Adjustable stability coefficient· Adjustable Compensation of Pilot circuit impedance· Continuous Monitoring of Pilot wires impedance· Back-up Overcurrent element· Oscillographic Recording· Breaker Failure protection· 5kV isolation level of the pilot (15kV with additional transformer)· Up to 1000W pilots resistance (up to 2500W with additional transformer)

MICROELETTRICA SCIENTIFICAMILANO ITALIA

PROG.

_

ENTET/RESET

SELECT+

PILOT WIREDIFFERANTIALRELAY TYPE

MFP

d>

FUNC.DISAB.

B.I.

I>>

MODE

IA 500A

F.P.

I.T.PROG/I.R.F.

I>

PILOT WIRE DIFFERENTIAL PROTECTION RELAY

FOR CABLES AND LINES

MFP - 5 N45-R0NC.

MLINELINE

1F - 50/51 (I>): Low-set Overcurrent

- Minimum pick-up level : I> = (0.5 - 20)In, step 0.01In- Trip time delay : tI> = (0.05 - 9.99)s, step 0.01s

- Instantaneous : £ 0.03s

2F - 50/51 (I>>): High-set Overcurrent

- Minimum pick-up level : I>> = (0.5 - 20)In, step 0.01In

- Trip time delay : tI> = (0.05 - 3.00)s, step 0.01s

- Instantaneous : £ 0.03s

Breaker Failure Element

- Trip time delay : tBF = (0.05 - 1.00)s, step 0.01s

TAI-15 MFP-5 TAS-5TAI-15MFP-5TAS-5

S2

C

28

B

AS127

N

26

25

CB

A

N

26

25

S2

S1

Summation Transformer

A-B-C (SYMM.) = 100A-B = 118B-C=C-A = 57.5A-N = 288B-N = 173C-N = 231

Fault type

CT + Relay burden £ 10VA

Output %

Rated primary current 1 or 5A Primary Resistance 1.5/0.5Rated Secondary current 20mA Secondary Resistence 180Knee point voltage 450V

W

£ W³

Digital Inputs

- B1 = Function Blocking

- B2 = External Oscillography Trigger

- B3 = Interlocking

Current Transformer Requirement

Burden : ³ 10VA

Class : 5P10)2R(RIf"

In

50Vk LCT ++³

NC.N45- R0 MFP

MFP

Double OutputStandard OutputMS-SCE1676-R0

RS485

MS-SCE1675-R0

RS485

MFP NC.N45-R0

Connexion Diagram

Quartier du Pavé Neuf, 49 rue de l’Université - F-93191 Noisy le Grand

Tél : + 33 1 48 15 09 09 - Fax : +33 1 43 05 08 24 Email : micronr@club-internet.fr http : //www.microelettrica.com- -

Power supply

Execution0 Flush mounting 0 Surface mounting 0 Standard rack 19”3U

Rated input

0 In = 1 A0 In = 5 A

Special request

Quantity

Type 1 : 24 à 100 Vac et 24 à 125 Vdc ± 20 %. Type 2 : 80 à 220 Vac et 90 à 250 Vdc ± 20 %.

Ordering data

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