GE SFF201A Manuale utente

GEK-90636D

INSTRUCTIONS

Static

Frequency

Relays

SFF2O1A,

SFF2O2A,

SFF2O4A,

GEK-90636

rrabl

Contents

Page

Description

Application

Under

Frequency

Rate

Change

Over

Frequency

Load

Restoration

Specifications

Control Voltage

Control

Voltage

Measurement

Input

Settings

Environmental

Ratings

Burden

Contact Ratings

Settings

Displays

Functional

Description

Construction

Receiving,

Handling

and

Storage

Acceptance

Tests

General

Visual

TestEquipment

General

Testing

Considerations

Relay

Outputs

Tests

Over

Frequency

Relay

Tests

Over

Frequency

Test With

Variable

Frequency

Generator

Over

Frequency TestWith

Single

Line

Frequency

Under

Frequency

Relay

Tests

Under

Frequency Test

With

Variable

Frequency

Generator

Under

Frequency

Test

With

Single

Line

Frequency

Rate

Change

for

Multiple

Setpoint

Models

Only

Rate

Change

Test

for

Variable

Frequency

Generators

Rate

Change

Test

for

Single

Line

Frequency

Restore

Relay

Tests

Restore

Test

With

Variable

Frequency

Generator

Restore

Test

With Single

Line

Frequency

Installation

Procedure

Surge

Ground

Electrical

Tests

Settings

Trouble

Shooting

Servicing

Periodic

Checks

and

Routine

Maintenance

Renewal

Parts

Cover Photo:

8043796

GEK-90636

DESCRI

PTION

The type

SUP

relays

are

digital

frequency

relays

that

measure

the

system

frequency.

Three

versions

the

5FF

are

available

providinç

one,

two,

four

frequency

setpoints.

Each

the

frequency

measuring

elements

independent,

and

can

independently

set

for

under

frequency,

over

frequency,

restore

operation,

and

has

form

output

contact.

Each

element

may

set

for

any

freQuency

over

the

ranse

of 40

79.9

0.1 Hz

steps

the

SFF2O(-)A

and

0.01

steps

the

SFF2O(-)B.

frequency

setting

outside

the acceptable range

made,

that

frequency

will

prevented

from

operating.

simple

rate-of-change

(ROC)

feature

can

enabled

the

multi-frequency

models.

When

this

feature

enabled,

output

will

produced

the

higher

set

frequency

the

lower frequency

setpoint

reached

before

the

timer

associated

with

the higher

set

frequency

can

time

out.

For

example,

assume

that

two

setpoint

relay

set

operate

with

0.75

second

delay.

and

with

second

delay.

reached

0.5

seconds

after

reached,

the

output

relay

associated

with

the

setting

will

operate

that

time

rather

than

waiting

until

the

full

0.75

seconds

has

expired.

Similar

performance

can

obtained

between

the

second

and

third

setpoints

and between

the

third

and

fourth

setpoints

the

four

setpoint

relay.

The

minimum

operating

time

for

under

frequency,

over

frequency,

restore

output

occur

cycles.

addition, an adjustable

timer

is provided for

each

frequency

setpoint

wherein

a delay

can

added

the

output.

When

used

the

under

frequency

over

frequency

mode

this

time

used

to delay

the

output,

whereas

used

prolong

the

output

when

the

function

used in

the

restore

mode.

Timer

ranges

are

shown

below:

Mpdel

Timer

Ranae

SteDs

Sfl20(-)A:

1.55

seconds

.05

second

SF’F20(-)B: 1.0

255

milliseconds

millisecond

0.lto

25.5

seconds

0.lsecond

The

undervoltage

cutoff

function

operates

block

all

outputs

whenever

the

input

voltage

less

than

the

undervoltage

cutoff

setting.

The

function

has

dropout

time

Sapproximately

one-half

(1/2)

cycle

and a

pickup

time

dapproximately

one

(1)

cycle.

The

function

adjustable

over

the

range

535

percent

inS

percent

stçps.

Note

that

the

percentage

based

120

volts,

the

nominal

rating

d’the

relay.

For

example,

the input

voltage

is 110

volts,

and

the

cutoff

level

set

percent,

cutoff

will

occur

volts

(50

percent

120)

rather than

volts (50

percent

These

instructions

not

purport

cover

all

details

or variations

equipment

nor

prouide

for

evely

possible

contingency

met

connection

with

installation,

operation

maintenance.

Should

funher

information

desired

should

particular

problems

arise

which

are

not covered

sufficiently

flu’

the

purchaseri

purposes.

the

matter

should

referred

the

General

Electric

Company.

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

vaiy

gnat4y.

GEK-90636

The

relays

can

powered

from

either

source.

External

connections

the

SFF2O1,

SFF2O2

and

SFF2O4

relays

can

seen

Figures

1, 2

and

respectively.

Table

summarizes

the

models

available.

Table

Model

Case

Set

SFF

Size

Points

201

202

204

APPlICATION

The

SFF

series

frequency

relays

can

applied

wherever

extremely

stable

device

required

for

the

accurate

detection

under

frequency

over

frequency

conditions.

Under

Krequency

The

under

frequency

trip feature

the

SFF

relays

may

used

load

conservation

schemes where

accuracy

and

repeatability

frequency

measurement

important.

system

disturbance

results

loss of

generating

capacity

such

that

load

exceeds

generation,

system frequency

will

start

decay

and

the

system

may

danger

collapsing.

Under

frequency

relays

distributed

around

the

system

can

used

detect

this

condition

and

disconnect selected

system

load

compensate

for

the

loss

generation.

Sufficient

load

must

disconnected

enable the

remainder

the

system

recover

normal,

near

normal

frequency.

this

way,

restoration

the

entire

system

will

facilitated.

overall

load

conservation

scheme

can

arranged

trip

off

selected

load

different

ways:

Disconnect

blocks

load

several

steps

with

each

step

occurring

successively

lower

frequency.

Disconnect

blocks

load

several

steps

time

basis

one

frequency

level

that

some

load

disconnected

each

time

step

reached.

Any

combination

the

above.

Each

frequency

measuring

element

the

SFF compares

the

period

each

cycle

the

voltage

wave

against

crystal

reference and

requires three

successive

cycles

under

over

frequency

before

the

delay

timer

started. If

the

input

voltage

wave is

distorted

affect

the

period

the

wave,

and

this

distortion

persists

for

the

total

time

setting, it

possible

for

the

relay

make an

incorrect

measurement.

Longer

time delay

settings

will

make

this

less

likely

occur.

the

other

hand,

the

frequency

exceeds

the

setting

for

least

one cycle

after

the delay

timer

GEK-90636

started,

arid

before

the

time

delay

reached,

the

timer

will

immediately

reset

and

new

measurement

will

started.

important

consideration

the

application

frequency

relays

the

location

the

potential

source

from

which

the relay

makes

its

measurement.

generally

not

good

practice

supply

relay

from

potential

source

that

connected

one

bus

section

and

use

that

relay

disconnect

load

another

bus

section.

For

example,

the

voltage and

frequency

circuits supplying

motor

load

not

zero

immediately

when

the

circuits

are

de-energized.

Rather,

both

the

voltage

and

the

frequency

decay

zero

and

often

different

rates

depending

the

characteristics

the

circuit

and

the

load.

frequency

relay

connected

such

circuit

could

produce

output

for

this

condition

the

voltage

stays

above

the

voltage cutoff

setting

for

the

time

delay

setting

(if

any).

the

relay

connected

disconnect

load

separate

bus section,

then

this

load

will

inadvertently

disconnected.

substation

which

has

large

amount

motor

load

may

present

problem

time

coordination

load

shedding

applications.

If the

transmission

sources

the

substation

are

tripped

out,

the

motor

load

would

tend

maintain

the voltage

while

the

frequency decreased

the

motors

were

slowing

down.

This

slow

decay

voltage

combined

with

fast

operating

under

frequency

relay

may cause

the

motor

breakers

trip

and

lock

out

unnecessarily.

unattended station,

restoration

the

motor

load would

not

then

accomplished

simply

reenergizing

the

transmission

sources.

‘This

problem

could

avoided

coordinating

the

settings

the

time

delay

the

under

frequency

trip

and

the

level

the

undervoltage

cutoff

function.

The

SFF

relay

may

also

used

industrial

installation

that

tapped

off

power company

transmission

circuit

that

utilizes

high

speed

automatic

reclosing.

For

faults

the line,

both

ends

the

line

will

tripped.

This

will

followed

high

speed

reclose.

important

for

the

industrial

load

disconnected

prior

the

reclosure

prevent

damage

motors

andlor

generators

that

may

have

slowed

down

during

the

interruption.

SFF

relay

the

plant

could

used

detect

the

drop

frequency

that

might

occur

during

the

time

that

the

transmission

line

open.

The

relay

could

used

trip the

incoming

breaker

the

plant

separate

from

the

power

system

before

reclosing

takes

place.

Each

application

will

have

to be

analyzed

determine

the

amount

frequency

decay,

any,

that

will

occur

during

the

open

circuit

period.

Rate

Change

The

rate

change

feature

available

only

multi-setpoint

models

the

SFF

relays,

and

usable

only

between

two

adjacent

setpoints;

i.e.,

and

F2, F2

and

F4.

This

feature

will

allow

load

shed

faster

the frequency

decays

rate

faster

than

was

anticipated

when

the

delay

timer

settings

were

determined.

The

rate

change

feature

enabled

setting

the

appropriate

ROC

switch

the

position.

Over

Frequency

The

over

frequency

function

may

used

anywhere

that

desired

detect

over

frequency

condition.

For

example,

can

used

protect

generator

against

operation

frequencies

above

rated

speed

that

could

caused

inadvertent

load

rejection.

Another

possible

application

the

over

frequency

function

schemes

used

protect

generator

against

accidental

energization

sub

synchronous

speeds

turning

gear.

such

schemes

the

over

frequency

function

would

used

remove

supplemental

protection

that

required

enabled

only

during

off-line

operation.

GEK-90636

CAUTION

should

recognized

when

applying

the

over

frequency

function

this

fashion

that

loss

I)C

the

relay

will

cause

the

output

relay

reset,

thus

enabling

the

associated

off-line

protection.

Load

Restoration

load

shedding

program has

been

successfully

implemented,

the

system

frequency

will

stabilize,

and

through

system

control

will

recover

normal.

The

recovery

normal

likely

quite

slow

and

may

extend

over

period

several

minutes.

the frequency

approaches

normal

the

restore

function

the SFF

relay

can

used

automatically

begin

the

load

restoration

process.

The

amount

load

that

can

restored

determined

the

ability

the

system

serve

it.

The

availability

generation,

either

locally

ol-

through

system

interconnections,

determines whether

not

the

shed

load

can

successfully

restored.

load

restoration

program

usually

incorporates

substantial

time

delay,

which

must

provided

timer

external

the

SFF

relay.

The

amount

time

delay

use

the

amount

time

required

add

generation

tie

lines

during

emergency

conditions.

Also,

both

the

time

delay

and

the

restoration

frequency

setpoints

should

staggered

that

all

the

load

not

reconnected

the

same

time.

Reconnecting

loads

distributed

basis

also

minimizes

power

swings

across

the

system

and

thereby

minimizes

the

possibility

initiating

new

disturbance.

Since

the

restoration timers

will

set

for

long

time

delays,

essential

that

they

not

reset

result

transient

system

frequency

oscillations

that

may

momentarily

reset

the

restore

output

function.

For

this

reason,

the

restore

function

provided

with

adjustable

time

delay

reset

before

the contacts

change

state

whenever

the

function

subjected

to a

frequency

change

from

above

the

setpoint

below

the

setpoint.

This

delay

adjustable

and should

kept

very

brief,

only

long

enough

ride

over

momentary

under

frequency conditions.

The

restore

frequency

setting

the

function

will

most

likely

very

rated

frequency.

If the

continuous

variations

normal

frequency

are

such

that

the

restore

function

output

relay

will

pick

and

drop

out

continually,

the

life

the

relay

may

shortened.

prevent

this,

contact

converter

designated

provided

control

the

restore

output.

energized

external

device

after

load

shedding has

occurred

and

when

desired

restore

load.

should

kept

energized

until

all

the

load

that

was

shed

has

been

restored

which

time

should

de-energized.

this

way,

the

restore

output

relay

will

only

operated

after

under

frequency

condition

has

been

detected and

until

the

load

that

was

shed

has

been

restored.

During

normal

frequency conditions,

will

de-energized

and

the

restore

function

will

not operate

due

minor

changes

frequency.

GEK-90636

SPECIFICATIONS

Control

Voltage

Nominal

48,

110,

125,

220,

250

Minimum

Volts

Maximum

280

Volts

Control

Voltage

Nominal

110-120

Vrms

Minimum

Vrms

Maximum

132

Vrms

Measurement

Input

Nominal

120

Vrms

Minimum

Vrms

(35%

nominal)

Maximum

132

Vrms

(110% of

nominal)

Settings

Frequency

SFF2O(-)A:

Setpoint

40.0

79.9

0.1

steps

SFF2O(-)B:

Setpoint

40.0

79.9

0.01

steps

Repeatability

±0.002

Timing

SFF2O(-)A:

Setpoint

to 1.55

seconds

0.05

second

steps

SFF2O(-)B:

Setpoint

255

milliseconds

millisecond steps

Setpoint

0.lto

25.5

seconds in

0.1

second

steps

Repeatability

Undervoltage

Setpoint

35%

95%

steps

based

l2OVrms

nominal

Setpoint

Accuracy

±5%

Repeatability

±3%

setting

from

35%

90%

Rate

change

(multi-setpoint

models

only)

Frequency

frequency

OUT

Frequency

frequency

OUT

Frequency

frequency

OUT

Environmental

Operating

-20°C

+55°C

95%

relative

humidity

(noncondensing). Note

that

the

unit

will

not

malfunction,

nor

damaged,

ambient

65°C

Storage

-40°C

75°C

95%

relative

humidity

(noncondensing)

Surge

ANSI

C37.90

(SWC

and

Fast

Transient)

IEC 255

RFI

GEK-9063

RATINGS

Burden

Table

Burdens

Model

Case

Set

Power Supply

Measurement

SFF

Size

Points

________

125

250

120

201 S2

3.2

3.5 6.3 8.1

202

4.9

5.2

8.0

10.6

204

8.4 8.7

11.5

15.7

Contact

Ratings

Make

and

carry

amps

for

second.

Break

Watts

Resistive

Break

(40

L/R)

277

Volts

maximum

Amperes

Target

supervision

unit

0.1

amp

operate

level

with

less

than

0.6

volt

drop

amps.

SWFTI

NGS

The

following

settings,

which

must

set

each

application,

are

made

from

the

front

the

relay

without

the

need

for

pulling

boards

removing

the

nameplate.

only

necessary

remove

the

front

cover

from

the relay.

Frequency

three

four

digit thumbwheel

switch

the front

panel

allows

the

frequency

each

setpoint

set.

Note:

setting

made

outside

the

stated

range,

that

frequency

setpoint

will

prevented

from

operating.

Function

three

position

slide

switch

permits

the

choice of

under,

over,

restore

modes of

operation.

When

the

restore

mode

chosen

the

timer

switched

dropout

delay and

the

contact

converter

input

enabled.

Rate

Change

(Multi

frequency

models

only)

two

position

recessed

switch

selects

the

rate

change

function.

This

function

only

valid

for

under

frequency

operation.

disabled

when

over

frequency

restore

modes

are

chosen.

Time

Delay

array

two-position

toggle

switches

allows

setting

the

output

delay.

The

setting

equal

the

sum

the

switches

the

position.

Voltage

Cutoff

array

two-position

toggle

switches

calibrated

steps

used

choose

the

undervoltage

cutoff

level.

The

cutoff

setting

equal

the

sum

the

switches

the

position.

GEK-

90636

DISPLAYS

The

trip

indicators

are

red

LED’s

which

are supervised

the

passage

trip

current.

One

provided

for

each

tripping

element.

Table

Model

Target

Description

201

Frequency

output

contact

operated

202

Frequency

output

contact

operated

ROC

Rate

change

caused

contact

operate

Frequency

output

contact

operated

204

Frequency

output

contact

operated

ROC

Rate

change

caused

contact

operate

Frequency

output

contact

operated

ROC

Rate

change

caused

contact

operate

Frequency

output

contact

operated

ROC

Rate

change

caused

contact

operate

Frequency

output

contact

operated

Test

Amber

LED’s

light

indicate

when

the

frequency

detection

circuit

has

output

and

output relay

energized

(TB).

Service

normally

lit

green

LED

indicates

the

regulated

and

start-up

circuity

are

operational.

FUNCTIONAL

DESCRIPTION

The

potential

source

connected

studs

and

stepped

down

6.9

VRMS

filtered

and converted

to a

square

wave.

this

square

wave

that

measured

the

frequency element.

The frequency

measuring

circuit

compares

the

period

the

incoming

square

wave

against

crystal

reference.

the

source

frequency

differs

from

the

setpoint

for

than

three

consecutive periods

cycles

the

circuit

gives

output. If

the

under

voltage supervision

has

not

operated

this output

starts

a time

delay

(which

can

set

which

turn

drives

the

output

contact.

The

rate

change

feature if

selected

will

bypass

the

time

delay

the

lower

frequency

element

has

operated.

The

rate

change

path

F3,

F2,

and

Fl.

Therefore when

the

frequency

settings

are

made,

should

less

than

F3,

etc.

This

does

not

preclude

setting

one

element

for

restore,

another

for

over,

and

the

remaining

two

for

under

four

frequency relay.

only

important

that

the under

frequency

elements

adjacent

(F1-F2,

F2-F3,

F3-F4)

rate

change

desired.

Block

diagrams

each

model can

found

Figures

and

Internal

connection

diagrams

for

each

model

can

found

Figures

10,

and

12.

GEK-90636

CONSTRUCTION

The components

the

relay

are

mounted

cradle assembly

that

can

easily

removed

from

the

relay

case.

The

cradle

locked

the

case

latches

the

top

and

bottom.

The

electrical

connections between the

case

blocks

and

the cradle

b1ocks

are

completed

through

removable

connection

plugs

permit

testing

the

relay

its

case.

The

cover is

attached

the

front

the

case

and

includes

two

interlocking

arms

that

prevent

the

cover

from

being

replaced

until

the

connection

plugs

have

been

inserted.

The

case

suitable

for

semi-flush

mounting

panels.

Hardware

available

for

all

panel

thicknesses

two

inches.

panel

thickness

1/8

inch

will

assumed

unless

otherwise

specified

the

order.

Outline

and

panel

drilling

dimensions

for

the

SFF2O1

are

shown

figure

and

for

the

SFF2O2

and

204

figure

The

printed

circuit

boards are

mounted

behind

the

nameplate

and

can

accessed

removing

the

four screws

securing

the

nameplate.

The

boards

are mounted

horizontally

guides.

Each

board

labeled

correspond

given location.

Use

part

number

286A2847P1

card

puller

other

suitable means

remove

the

circuit

boards.

you

not

have

card

puller,

careful

not

damage

bend

any

components

when removing the

boards.

The

output

relays

are

mounted

sockets

board

fixed

the

back

the

cradle.

relay requires

replacement

unclip the

retaining

wire

and pull

the

relay

out

the

socket.

The

input

transformer

mounted

the

bottom

plate

the

relay

cradle.

RECEIVING,

HANDLING

AND

STORAGE

This

relay

contains

electronic

components

that

could

damaged

electrostatic

discharge

currents

those

currents

flow

through

certain

terminals

the

components.

The

main

source

electrostatic

discharge

currents

the

human

body,

and

the

conditions

low

humidity,

carpeted

floors

and

isolating

shoes

are

conducive

the

generation

electrostatic

discharge

currents.

Where these

conditions

exist,

care

should

exercised

when

removing

and

handling

the

modules

make

settings

the

internal

switches.

The

persons

handling

the

module

should

make

sure

that

their

body

has

been

discharged,

touching

some

surface

ground

potential,

before

touching

any

the

components

the

modules.

These

relays,

when not

included

part

control

panel,

will

shipped

cartons

designed

protect them

against

damage.

Immediately

upon

receipt

relay

examine

for

any

damage

sustained

transit.

damage

resulting

from

handling

evident,

file

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric Sales

Office.

The

relays

should

stored

their

original

cartons.

the

relays

are not

installed

immediately, and

place

that

free from

moisture,

dust

and

metallic

chips.

ACCEPTANCE

TESTS

General

The

relay

should

examined

and tested

upon

delivery

insure

that

damage

has

been

sustained

shipment

and

that

the

relay

functioning

correctly.

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