GE MDP User manual

MDP

DIGITAL

TIME

OVERCURRENT

RELAYING

SYSTEM

•

SRW

•

DCi

‘

’

•

513

•

“

}

MODEL

MOP

2120000

AMPS

136

VDO

100802

QEK

•

‘

•

‘

•

Wli

;

•

’

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GEK

100682

Table

Contents

PRODUCT

DESCRIPTION

NOMENCLATURE

APPLICATION

TECHNICAL

SPECIFICATIONS

Ranges

and

Settings

OPERATING

PRINCIPLES

Inputs

External

Inputs

COMMUNICATIONS

PORT

Installation

Replacement

Communications

Upgrade

Card

MEASUREMENT

Inverse

Time

Unit

Instantaneous

Unit

Changing

Settings

Pickup

TOC

Pickup

IOC

Time

Dial

Curve

Selection

IOC

Delay

Communications

Address

OUTPUT

CONTACT

CONFIGURATION

Display

and

Reset

Self

Test

and

Error

Routines

CONSTRUCTION

Internal

Connection

Diagram

Displays

RECEIVING

HANDLING

STORAGE

ACCEPTANCE

TESTS

Visual

Inspection

Electrical

Tests

Inverse

Time

Unit

Instantaneous

Unit

Ground

Unit

MDP

Link

Software

Overview

System

Reuirements

Installation

GENERAL

OPERATION

Main

Horizontal

Bar

Pull

Down

Menus

Dialog

Boxes

List

Boxes

Entering

Text

and

Numbers

PROGRAM

OPERATION

Main

Relay

Functions

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GEK

100682

lOgout

Hang

phone

request

relay

Data

request

Fault

data

Reset

fault

data

Breaker

status

Trip

breaker

Local

functions

DOS

Setup

Communication

port

number

Dial

type

Modem

connection

time

Relay

parameters

Add

relay

list

dElete

relay

list

display

mode

Memory

available

...

Help

Exiting

MDP

LINK

INSTALLATION

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

Cover

Photo

8919557

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

everypossible

contingency

met

connection

with

installation

operation

maintenance

Should

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

purposes

the

matter

should

referred

the

General

Electric

Company

(

USA

)

the

extent

required

the

products

described

herein

meet

applicable

ANSI

IEEE

and

NEMA

standards

;

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Courtesy of NationalSwitchgear.com

GEK

100682

MDP

DIGITAL

TIME

OVERCURRENT

RELAYING

SYSTEM

PRODUCT

DESCRIPTION

Phase

and

ground

current

metering

;

Operating

time

and

fault

current

the

last

trip

MDP

relays

digital

Type

microprocessor

based

non

directiona

overcurrent

relays

that

protect

against

phase

and

phase

ground

faults

are

Breaker

status

•

Breaker

operation

(

232

and

485

versions

only

)

The

MDP

relay

performs

the

following

functions

The

MDP

series

relays

include

four

measuring

units

one

for

each

the

three

phase

currents

and

additional

one

for

ground

residual

current

Each

the

four

measuring

units

includes

time

and

instantaneous

overcurrent

unit

The

phase

settings

arc

combined

that

all

phase

units

are

set

the

same

Inverse

overcurrent

including

four

characteristic

curves

and

four

values

definite

time

protection

well

instantaneous

overcurrent

protection

with

programmable

delay

;

Phase

and

ground

current

measurement

;

CURRENT

RANGES

Nominal

Current

Inverse

Time

Unit

Instantaneous

unit

(

)

(

)

Ground

125

Amps

0.5

4.375

Amps

0.1

0.875

Amps

Phase

Amp

Nominal

1.5

13.125

Amps

0.5

4.375

Amps

(

All

Relays

)

0.5

4.375

Amps

0.3

2.625

Amps

0.1

0.875

Amps

0.05

0.4375

Amps

(

AMP

)

Amp

Nominal

0.3

2.625

Amps

The

pickup

value

for

the

instantaneous

unit

can

adjusted

between

and

times

the

value

selected

for

the

inverse

time

unit

produced

(

)

instantaneous

unit

inverse

unit

(

)

phase

ground

That

selection

made

means

switch

behind

the

right

lower

side

the

nameplate

alarm

output

provided

signal

critical

alarm

such

power

supply

failure

self

check

failure

output

contact

provided

the

breaker

from

command

issued

via

the

Communications

Channel

The

instantaneous

unit

can

disabled

adjusting

the

setting

zero

(

)

times

the

inverse

value

The

MDP

relay

has

two

trip

output

relays

which

can

selected

indicate

whether

trip

has

been

Courtesy of NationalSwitchgear.com

GEK

100682

NOMENCLATURE

MDP

000

communications

control

inputs

(

Block

Ground

Block

Instantaneous

Breaker

Status

)

Control

inputs

and

communications

upgrade

socket

CommNet

MOD

BUS

RTU

232

485

Amp

Nominal

0.5

4.375

Amps

Ground

Amp

Nominal

1.5

13.125

Amps

Ground

Amp

Nominal

0.1

0.875

Amp

Ground

Amp

Nominal

0.1

0.875

Amp

Ground

Amp

Nominal

0.3

2.625

Amp

Ground

Amp

Nominal

0.05

0.4375

Amp

Ground

Amp

Nominal

0.5

4.375

Amp

Ground

Phase

;

VDC

(

VDC

)

125

VDC

(

38.5

150

VDC

)

120

110

250

VDC

(

285

VDC

)

240

Revision

Level

APPLICATION

Time

overcurrent

relays

are

used

for

the

protection

feeders

transmission

lines

alternating

current

machines

and

transformers

and

for

numerous

other

applications

where

accurate

measurement

current

and

timing

necessary

The

operating

tune

associated

protective

devices

should

considered

the

selection

time

current

characteristic

for

particular

application

ensure

proper

coordination

with

minimum

circuit

isolation

Four

basic

time

current

characteristics

are

available

Type

MDP

relays

short

circuit

current

flowing

through

any

given

relay

dependent

upon

the

location

the

fault

relative

the

relay

than

the

system

generation

setup

the

time

the

fault

The

extremely

inverse

time

current

characteristic

shown

Figure

preferred

for

applications

where

sufficient

time

delay

must

provided

allow

energized

circuit

pick

accumulated

cold

load

without

unnecessary

tripping

inrush

currents

Distribution

feeder

circuits

are

good

example

such

applications

and

the

extremely

inverse

characteristic

best

suited

such

applications

because

nearly

approximates

typical

power

fuse

and

fuse

cutout

characteristics

The

inverse

time

current

characteristic

curves

are

shown

Figures

and

Figure

depicts

the

142

inverse

curve

and

applies

the

Amp

model

relays

only

These

relays

are

generally

applied

where

the

short

circuit

current

magnitude

dependent

largely

upon

the

system

generating

capacity

the

time

the

fault

The

very

inverse

time

current

characteristic

shown

Figure

generally

applied

where

the

magnitude

The

general

practice

for

grounded

distribution

system

protection

use

three

phase

overcurrent

functions

for

protection

against

interphase

faults

and

ground

residual

overcurrent

function

for

single

phase

ground

faults

Courtesy of NationalSwitchgear.com

GEK

100682

The

use

separate

grounid

overcurrent

function

advantageous

because

can

generally

adjusted

provide

faster

and

sensitive

protection

for

single

phase

ground

faults

than

the

phase

overcurrent

functions

Typical

connections

for

such

application

are

shown

Figures

and

This

safety

factor

can

reduced

0.07

second

the

time

unit

instead

set

the

desired

time

accurate

tests

The

instantaneous

overcurrent

unit

can

applied

many

instances

reduce

the

fault

clearing

time

for

high

fault

currents

This

unit

normally

set

pick

only

internal

faults

the

protected

zone

Significant

transient

overreach

can

experienced

under

certain

conditions

and

this

must

taken

into

account

selecting

pickup

setting

that

higher

than

that

which

would

dictated

the

maximum

steady

state

external

fault

current

The

pickup

setting

the

MDP

time

unit

should

chosen

that

will

operate

for

all

short

circuits

the

protected

zone

and

also

provide

back

protection

for

short

circuits

the

immediately

adjacent

system

element

when

possible

The

time

unit

pickup

should

set

low

enough

ensure

that

the

minimum

fault

current

least

1.5

times

the

setting

IMPORTANT

NOTE

one

unit

(

instantaneous

inverse

)

operates

the

other

unit

(

inverse

instantaneous

)

will

also

operate

The

MDP

’

fault

report

will

record

the

first

fault

that

occurred

When

the

fault

cleared

the

MDP

’

fault

LED

’

will

display

Phase

Ground

Instantaneous

and

inverse

time

faults

See

display

section

how

interpret

the

display

for

various

fault

conditions

The

MDP

will

generate

new

fault

report

when

the

fault

current

drops

below

the

pick

value

and

new

fault

occurs

The

time

delay

adjustment

the

time

unit

should

chosen

assure

selectivity

with

the

protection

the

adjacent

system

elements

This

adjustment

should

made

for

the

condition

that

yields

maximum

fault

current

the

relay

location

The

time

delay

determined

the

adjacent

relay

operating

time

for

this

condition

plus

coordinating

time

allowance

that

includes

the

adjacent

circuit

breaker

maximum

operating

time

and

safety

factor

accommodate

any

uncertainties

Since

the

MDP

time

unit

has

insignificant

overtravel

the

only

relay

variation

that

needs

consideration

the

safety

factor

the

tolerance

the

time

curves

0.17

second

safety

factor

generally

used

the

relay

time

determined

selecting

time

dial

setting

from

the

time

curves

Contact

converter

input

and

the

output

select

switch

the

MDP

allow

Zone

Selective

Interlocking

the

MDP

relays

This

scheme

provides

instantaneous

operation

(

with

minimum

time

delay

)

the

upstream

relay

for

faults

between

the

upstream

and

downstream

relays

Refer

Figure

for

typical

scheme

and

settings

considerations

Note

that

all

the

feeders

must

radial

with

very

weak

source

TECHNICAL

SPECIFICATIONS

Nominal

frequency

Nominal

current

amps

VDC

(

VDC

)

125

VDC

(

38.5

150

VDC

)

120

110

250

VDC

(

285

VDC

)

240

0.1

0.875

0.3

2.65

0.09

2.8

(

2.25

)

0.1

0.875

0.3

2.65

0.09

2.4

(

2.25

)

0.5

4.375

1.5

13.25

0.01

11.5

(

0.25

)

0.5

4.375

1.5

13.25

0.01

(

0.25

)

Less

than

watts

all

voltages

quiescent

Less

than

4.5

watts

maximum

voltages

Auxiliary

power

supply

Burden

Courtesy of NationalSwitchgear.com

GEK

100682

(

available

upon

request

)

Operating

Storage

Temperature

Overcurrent

Ratings

Three

Second

;

One

Second

100

Continuous

RATINGS

34500

87500

13600

AMP

SPECIAL

Models

MDPx

have

sensitive

ground

Relative

Humidity

without

condensing

Accuracy

Operating

Value

Operating

Time

0.025

seconds

whichever

greater

Repeatability

Operating

Value

Operating

Time

0.025

seconds

whichever

greater

Output

and

Trip

Contacts

Closing

Contact

will

and

conduct

maximum

amps

for

tripping

duty

control

voltages

300

VDC

The

output

contact

also

rated

for

Capacitive

trip

devices

Interrupting

watts

resistive

with

maximum

amps

and

300

VDC

Continuous

amps

with

300

VDC

maximum

(

Note

responds

RMS

values

harmonics

600

)

Frequency

operating

range

Communications

Address

002

998

NOTE

Interference

suppression

ground

connection

This

connection

should

short

possible

assure

maximum

protection

conductors

are

recommended

The

MDP

relay

contains

high

frequency

interference

protection

consisting

series

capacitors

connected

between

the

input

terminals

and

the

case

Braided

AWG

The

case

stud

the

relay

should

connected

ground

these

interference

suppression

circuits

can

perform

their

protective

function

Courtesy of NationalSwitchgear.com

GEK

100682

RANGES

AND

SETTINGS

The

following

indicates

the

ranges

standard

models

Nominal

Currcntlnverse

Time

Unit

Amperes

Phase

Unit

Models

(

)

Phase

Unit

1.5

13.125

Amps

cumulative

increments

0.375

750

3.0

6.0

Ground

Unit

model

375

Amps

cumulative

increments

0.125

0.250

2.0

Ground

Unit

model

1.5

13.125

Amps

cumulative

increments

0.375

0.750

3.0

6.0

Ground

Unit

model

0.1

0.875

Amp

cumulative

increments

0.025

0.050

0.2

0.4

Amperes

Phase

Unit

Model

(

)

Phase

Unit

0.5

375

Amps

cumulative

increments

0.125

0.25

0.50

1.0

2.0

Ground

Unit

model

0.5

4.375

Amps

cumulative

increments

0.125

0.250

0.50

1.0

2.0

Nominal

Current

Inverse

Time

Unit

Ampere

Phase

Unit

Models

(

)

Phase

Unit

models

;

625

Amps

cumulative

increments

075

0.150

0.30

0.60

1.20

Ground

Unit

model

0.875

Amp

cumulative

increments

0.025

0.050

0.10

0.2

0.4

Ground

Unit

model

0.3

2.625

Amps

cumulative

increments

0.075

0.150

0.30

1.2

Ground

Unit

model

0.05

0.4375

Amp

cumulative

increments

0.0125

0.0250

0.050

0.1

0.2

Time

Delay

(

TOC

)

(

independent

for

phase

and

ground

)

Instantaneous

Unit

Time

Delay

(

independent

for

phase

and

ground

)

Depends

the

curve

selected

Five

Inverse

Time

curves

are

available

(

see

Figures

and

)

well

four

definite

times

(

maximum

time

seconds

)

all

the

same

relay

1.55

seconds

millisecond

steps

Phase

Operating

Curves

Curve

Selection

Inverse

142

(

for

Amp

models

)

Long

Time

Inverse

Veiy

Inverse

and

Extremely

Inverse

Four

families

definite

time

characteristics

with

maximum

values

and

seconds

Instantaneous

Unit

Pickup

(

independent

for

phase

and

ground

)

times

the

pickup

the

TOC

setting

Setting

zero

(

)

disables

instantaneous

unit

(

)

multiples

selected

Between

each

family

curves

specific

curve

can

selected

between

0.5

and

cumulative

steps

and

for

Amp

relays

Amp

model

range

from

0.05

1.0

cumulative

steps

0.05

0.1

and

Courtesy of NationalSwitchgear.com

GEK

100682

Ground

Operating

Curves

Curve

Selection

EXTERNAL

INPUTS

Three

external

inputs

are

provided

One

when

energized

blocks

tripping

the

ground

units

The

second

blocks

the

phase

and

ground

instantaneous

trip

elements

when

energized

The

third

when

energized

indicates

that

the

Breaker

Status

closed

Diode

bridges

are

provided

all

inputs

;

thus

they

can

all

actuated

either

switched

positive

depending

the

polarity

connected

the

stud

These

inputs

can

energized

either

Inverse

142

(

for

Amp

models

)

Long

Time

Inverse

Very

Inverse

and

Extremely

Inverse

Four

families

definite

time

characteristics

with

maximum

values

and

seconds

Between

each

family

curves

specific

curve

can

selected

between

0.5

and

cumulative

steps

0.5

and

for

amp

relays

amp

model

range

from

0.05

1.0

cumulative

steps

0.05

0.1

0.2

and

switched

negative

142

the

INVERSE

curve

the

one

amp

model

NOTE

that

the

Breaker

Status

and

Block

Ground

inputs

and

respectively

must

switched

the

same

polarity

since

they

common

ground

(

)

Communications

Address

•

;

setting

000

indicates

communications

and

sets

the

default

display

phase

Current

002

998

COMMUNICATIONS

PORT

The

MDP

relay

has

communications

feature

that

permits

easy

installation

various

communications

interface

modules

All

values

are

adjusted

with

dip

switches

located

the

front

the

relay

except

the

communications

address

which

located

the

rear

the

cradle

INSTALLATION

REPLACEMENT

COMMUNICATIONS

UPGRADE

CARD

NOTE

install

communications

upgrade

card

replace

existing

card

begin

removing

the

relay

from

the

case

Refer

Figures

during

the

following

procedure

For

232

and

485

all

relays

will

respond

address

001

Before

continuing

connect

approved

wrist

grounding

strap

ground

discharge

any

static

electricity

your

body

that

could

damage

the

electronics

the

MDP

relay

wrist

strap

provided

with

the

communications

card

kit

The

wrist

strap

must

provide

safe

high

resistance

ground

OPERATING

PRINCIPLES

INPUTS

The

secondaiy

current

from

the

current

transformers

the

protected

line

connected

the

relay

and

immediately

reduced

via

the

internal

current

transformers

The

secondaries

the

relay

current

transformers

are

connected

across

input

resistors

yielding

voltage

proportional

the

relay

input

current

Remove

four

screws

attaching

the

nameplate

settings

board

and

the

NOMEX

insulation

paper

the

relay

cradle

(

Cover

photograph

)

Note

that

there

are

four

metal

spacers

between

the

nameplate

and

the

settings

board

not

lose

them

let

them

fall

into

the

relay

assembly

Carefully

place

the

settings

board

top

the

cradle

expose

the

This

voltage

rectified

and

filtered

before

being

applied

the

multiplexor

and

analog

digital

converter

which

are

internal

the

microprocessor

Courtesy of NationalSwitchgear.com

GEK

100682

communication

card

’

SIMM

socket

located

the

lowest

board

(

digital

input

communications

board

)

SET

THE

COMMUNICATIONS

ADDRESS

(

Figure

)

before

restoring

the

cradle

the

case

expose

the

SIMM

socket

located

the

lowest

board

carefully

push

down

the

board

disengage

the

board

spacers

(

Figure

)

(

not

try

remove

the

board

from

the

cradle

)

MEASUREMENT

timer

internal

the

microprocessor

generates

interrupt

every

millisecond

Phase

and

ground

measurements

are

made

each

these

interrupts

These

measurements

are

grouped

separately

for

each

phase

and

ground

groups

ten

and

the

average

the

maximum

value

these

groups

taken

Replacing

Existing

Board

For

Replacement

Only

(

Skip

Step

installing

card

for

the

first

time

)

•

This

average

converted

times

pickup

TOC

which

the

value

with

which

the

relay

works

This

value

displayed

second

intervals

you

are

replacing

existing

SIMM

card

then

the

old

one

needs

removed

Start

simultaneously

pushing

outwards

the

catches

either

side

the

SIMM

board

while

lifting

the

board

angle

This

will

release

the

board

INVERSE

TIME

UNO

Installing

New

Board

The

times

pickup

TOC

measurement

obtained

compared

independently

for

each

phase

and

ground

with

value

the

pickup

setting

that

corresponds

one

times

(

)

pickup

TOC

the

measurement

exceeds

the

fixed

setting

Pickup

LED

lights

the

front

the

relay

Remove

the

communications

card

from

its

protective

packaging

Insert

the

card

into

the

SIMM

socket

angle

the

socket

with

the

integrated

circuits

facing

Push

the

card

down

until

snaps

into

the

socket

and

the

latches

either

side

the

board

catch

above

the

new

board

(

Figure

)

;

assemble

the

MDP

relay

engaging

the

board

spacers

the

lowest

board

(

digital

input

communications

board

)

into

the

processor

board

above

(

Figure

)

Align

the

NOMEX

shield

the

solder

side

the

settings

board

Take

one

screw

and

spacer

time

and

push

the

screw

through

the

nameplate

spacer

settings

board

and

NOMEX

The

minimum

current

necessary

cause

the

Inverse

Time

measuring

elements

operate

never

less

than

the

set

value

(

)

nor

greater

than

(

110

)

the

set

value

1.0

Imin

1.1

The

dropout

pickup

ratio

not

less

than

based

the

actual

operating

value

The

MDP

relay

incorporates

five

inverse

time

curves

and

four

definite

times

(

see

Figures

)

NOTE

The

NOMEX

protects

the

ribbon

cable

from

the

leads

the

settings

board

The

curve

within

family

selected

the

time

dial

The

characteristic

curves

for

the

MDP

relay

correspond

approximately

the

following

formulae

Tighten

the

screw

just

enough

hold

the

assembly

place

until

all

four

screws

are

aligned

When

all

the

screws

are

aligned

tighten

them

with

gentle

pressure

that

the

board

mounted

evenly

Courtesy of NationalSwitchgear.com

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