Pivot Arm Turning Gear

8/18/2019 Pivot Arm Turning Gear

1/24

GT 12 Turning (Barring ) Gear Table of contents

1 Basic overview Pages 2 to 4

2 Detailed description of operation Pages 5 and 6

3 P and ID Page 7

4 Manufacturers Manual Pages 8 to 15

5 Panel signals ( in German) Page 16 to 17

6 Solenoid Valve signal Trn/Gr Clutch-V1 12MBV35AA001 Page 18

7 Solenoid Valve signal Trn/Gr Clutch-V2 12MBV35AA002 Page 19

8 Solenoid Valve signal Trn/Gr S/O-V 12MBV35AA003 Page 20

9 Pivot Arm signal Engaged 12MKB21CG001H Page 21

10 Pivot Arm signal Disengaged 12MKB21CG001M Page 22

11 Pivot Arm signal Disengaged 12MKB21CG001N Page 23

12 Pivot Arm signal Disengaged 12MKB21CG001P Page 24


2/24

Gas

Turbine

Description of

Components

Gas

Turbine

Hydraulic

Turning

Gear

'i

:..

j

'\.. -

Also

refer

to:

Lube and Jacking

Oil

System

3.1-8000

Function

The

hydraulic

turning

gear

is

used

to

turn

the rotor

after the

turbine-generator

has

been

shut

down.

This

ensures uniform

cooling

and

prevents

distortion

of the

rotor.

.

Construction

of

the

Shaft Turning Gear

A

gear

rim

(2)

is

mounted

on the intermediate

shaft

(3),

which

connects the turbine

rotor with

the

generator

rotor. This

gear

rim is located

near

the

compressor

bearing casing.

To

turn

the

shaft,

drive

pinion

(9)

mounted

on

a

swingarm is

shifted inward

to mesh with the

gear

rim

(2).

A

pinion

(5)

connects

the

drive

pinion

(9)

with the

hydraulic motor

(1).

'vVheii

errgagirrg

tire

drive

pirrion

(v),

rhe

circumferential speeds

of the

pinion

and the

gear

rim

(2)

on

the intermediate

shaft

(3)

must be equal.

The

speed

of the hydraulic

motor, allowing for the

gear

ratio,

must therefore

be

brought

to

the

meshing

speed (see Description, Section 3.1-8000).

Hydraulic

Motor

The

hydraulic

motor

(1)

converts

oil

pressure

into

torque,

which is

used to turn the rotor.

The

greater

the

oil

pressure

acting

on the hydraulic

motor, the

greater

this

torque

will be.

Motor speed is roughly

proportional

to

the

oil

flow

rate.

This

speed is

measured by

speed

sensors

(4).

Engaging

Mechanism

The

drive

pinion

(9)

is mounted

on a swing

arm

(8).

To

shift

the

drive

pinion

(9)

inward,

oil

pressure

is

applied

to the engaging

cylinder

(6).

I

he motion

ot

the engaging

cylinder

piston

causes

the

swingarm

and

the

attached

drive

pinion

(9)

to

move

toward

the

gear

rim

on

the

intermediate

shaft,

meshing

the

drive

pinion

(9)

with the shaft

gear

rim.

When

the

shaft turning

gear

is

not

in

operation.

the

engaging

cylinder

is not

pressurizeC

and

the

swingarm

is

held

in

the

disengaged

position

by

the

spring

(7).

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3/24

Gas Turbine

Description of Components

Gas

Turbine

Hydraulic

Turning

Gear

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1 Hydraulic

motor

2

Gear dm

3 lntermediate shaft

4 Speed

sensors

5

Pinion

6

Meshing

cylinder

7 Spring

8

Swing

arm

9 Drive

pinion

Fig.

1:

Hydraulic Turning Gear

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5/24

Gas

Turbine

Description

of Auxiliary

Systems

Lubricant.

Supply

System

Lube

and

Jacking

OilSystem

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Shaft Turning

Gear

After

the turbine-generator

has

been

shut

down, the

line

of shafting

(gas

turbine

and

generator)

is

rotated

at

low speed

(for

example,

120rpm)

in

turning

gear

mode.

This

flow

of alr forced

through

the

gas

turbine

by the

blading

ensures

uniform

cooldown

of

the

machine.

Distortion

of

the

casing

(arching:

caused

by

passive

cooling

without

sufficient

air

flow

through

the machine,

involves more rapid cooling of

the

lower casing

regions)

and rotor

are

prevented,

shaft

rotation

remains

unrestricted

and

the

turbine-generator

is

ready

for

the

next start.

The

gas

turbine

remains

in turning

gear

mode

until a

defined

time

has

elapsed

(K.TURN.O1

+

K.TURN.04,

for

example,

24

hours),

allowing

the

machine

to sufficienfly

cool

down.

This

operation

is referred

to

as

cooldown

turning. The

turning

gear

is shut

down

after

conclusion

of

cooldown

turning.

When

the

shaft has

come

to a standstill

(speed

lower

than

S.TURB.02

(for

example,

6rpm) for

longer

than

K.SCHMOEL.08

(for

example,

10min),

the

jacking

oil

pumo

and the

lube

oil

pump

are

shut down.

The

shaft

is

turned

briefly

at regular

intervals

of

K.TURN.02 (for

example,

every

6 hours)

during

extended

outages to

confirm

that

it

still rotates

freely.

Turning

gear

speed

is not

reached

at such

times.

This

operation

is

known as interval turning.

The

gas

turbine

is

started

either

from

a standstill

or

with the

shaft coasting

down.

lf

running,

the turning

gear

is shut down

prior

to

starting

the

gas

turbine.

Turning

gear

speed

is

selected

so

as

to

ensure

sufficient

air

throughput

for uniform

cooldown

of the

casing and to

prevent

blade clattering.

For

mechanical

design

reasons,

the turbine

blades

are

seated loosely

in

the

rotor

disk

slots

at

room

temperattrre. At

very low

shaft

speeds

the

blade

rcots

shift slightly in

their

slots and

clatter

audibly.

Above

a

certain speed,

centrifugal

force

firmly

seats

the

blade

roots.

The

shaft turning

gear

is located

in

the

compressor

after allowing

for the

gear ratio

of

the drive pinion

and

gear

ring.

Jacking

oil

is

supplied

to

the hydraulic

motor

and

the

swingarm

actuator.

During

operation

of the

gas

turbine

with the

jacking

oil

pump

shut down,

the hydraulic

motor

is

supplied

with

lube

oil

via

swing

check

valve

MBV35AA201

to

prevent

damage

that

is

typical

of

extended

equipment

standstills.

When

solenoid

valves

MBV35AA001

and

MBV35AA002

of

the swingarm

actuator

are

energized,

hydraulic

oil

is

supplied to

hydraulic

cylinder

MBK21AU001

and the

swingarm

pivots

inward,

meshing

the

pinion

at its

free

end

with

the

gear

ring.

lf

the

solenoid

valves

of the

swingarm

actuator

are deenergized

or.if

the

jacking

oil

pressure

declines,

the

swingarm

is returned

to

its

disengaged

position

by

spring

force.

The

hydraulic

motor

is supplied

with

hydraulic

oil

via

solenoid-type

shutoff

valve

MBV35AA003

and

flow

control

valve

MBV35AA101.

The

speed

of the

hydraulic

motor

can be

varied

from

near standstill

to

just

above

the

nominal

turning

gpar

speed

by

adjusting

the lift

of the

flow

control

valve.'This

is

achieved

by

energizing

solenoid

valve

MBV35AA101-Y01

(high

oit flow

rate

and

high

speed)

or

MBV35M101-Y02

(low

oil

flow rate

and

low

speed).

The

turning

gear can be

engaged while

the

turbine-

generator

shaft

is

at rest

or

coasting

down.

When

the

turbine-generator

shaft

is at rest,

the

swingarm

is

pivoted

inward

to

engage

the

pinion

gear

mounted

on its

free

end

with

the

gear

ring

on

the turbine-generator

shaft;

this

is

performed

with

the hydraulic

motor

shut

down

(solenoid-

type

shutoff

valve

MBV35AA003

is

closed).

The

solenoid-

type

shutoff

valve

is then

opened

and

the actuator

of

the

flow

control

valve

is

operated

using

a time

function

to

achieve

the lift

required for the turning gear

speed.

This

begins

turning

gear

mode.

When

shutting

down

the

gas

turbine,

turning gear

mode

begins

while

the turbine

generator

shaft

is

coasting

down.

The

disengaged

hydraulic

motor

is

accelerated

to

engaging

speed

(e.9.,

10

to

20rpm)

by

opening

the


6/24

Gas Turbine

Description

of Auxiliary

Systems

Lubricant

Supply

System

Lube

and

Jacking

Oil

System

i

pivot outward

to

its disengaged position and

the

hydraulic

motor

coasts

to

a

stop.

The

flow control

valve

is

then

actuated to its

minimum

lift

setting.

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8/24

t\

BHS

CINCINNATI

List

of

contents

1

Assembly

Instruction

2

Commissioning

r i

3

Operating

Instruction

4

Assembly Drawing

Installation Drawing

5

Spare

part

list

6

Wiring

diagram

7

Operating Instruction

hydraulic

motor


9/24

.i

BHS

Assembly

lnstructions

for

Rotor

Turning

Genr

Cincinnati

Adjustment

of

the

Rotor

Turning

Gear

Based on the

known

theoretical

distance from

the rotor

centre

to

the turning gear

flange

surface, the operating

position

of

swivel

pinion

(5)

is

exactly

adjusted

by BHS-Cincinnati.

Also, the

contactless

limit

switches

for

the

positions

engaged

and

disengaged

are

adjusted.

This

adjustment

must

not

be modified by

the

customer.

For

obtaining

the

correct

distance 473.2

between

rotor

centre

and

turning

gear

flange

surface,

BHS-C

will

provide

a

shirn

with

overmeasure

which

will

have

to

be

reworked

according to

the

actual

dimensions.

Adjustment

of Tooth

Flank

Clearance

Fut rotor

turning

gear

on bearing

covet.

For

orientation,

the

turning

gear

centre

has

been

marked

at the flange

base.

Engage

swivel pinion by hydraulic cylinder in

gear

ring

(hydraulic

hand

pump).

By

means

of

a feeler

gauge,

measure

the

tooth

flank

clearance

between

swivel

pinion

and

gear

ring.

Flank

clearance

target

0.3

*

0.1

rnrn

The

flank

clearance

can

be

modified by

clisplacement

of

the

turning

gear transversely

to

the

turbine axis.

Displacernent

to

the

left

seen

in direction

of

flow

-

higher

flank clearance

Displacement to the right

seen

in direction

of

flow -

lower

flank

clearance

Adjustment of Tooth

Contact

The tooth

contact

pattern

must

be checked

by

applying

ink.

Where

appropriate,

twist

the

turning

gear

by

its

vertical

axis

until

the tooth

contact

pattern

is equal

to

or better

than

80%

l.l

1.2

{i

1.3


10/24

rtr

BHS

Opernting

fnstructions

Rotor

Turning

Gear

incinnati

Commissioning

2 1

Wire

the connection

between control

cabinet and

turning

gear

according

to

tenninal plan

2 2

Check the

wiring

Check

the signats

of

limit

switches and

speed

probes

2 3

Connect

hydraulic

motor

to

hydraulic

system

Check

sense

of rotation

as

per

installation drawing

2 4

Connect

hyclraulic

cylinder

to

hyclraulic

system

Check

proper

lunctioning

Check all

connections for

leakage


11/24

:

BHS

Operatirrg Instnr

ctions

Rotor

Turning

Gear

incinnati

3.1

Automatic

Starting

from

Standstill

Engage

swivel

pinion

(5)

through hydraulic cylinder

(2S)

in

gear

ring

(9).

If

swivel

pinion (5)

does not mesh

with

gear

ring

(9),

then

drive

turning

gear

through

hydraulic

motor with

low

speed.

Cornplete

mesh

is

inclicated

by

lirnit

swiictr

(25).

Drive turning

gear

with full

power

and accelerate

rotor to turning

speed.

3,2

Automatic

Turning

after

Tripping

the

Turbine

Turbine has been

tripped

and

is

slowing down.

When the

rotor

has

reached

the

comntand speed

(approx.

double

turning

speed),

the

hydraulic

motor

is

started

by

means

of

the

control unit,

with

swivel pinion rernaining in

position

"blocked".

On

reaching the

turning

speed

(fi-equency

comparison

between gear

ring

and

swivel

pinion)

the hydraulic cylinder

is

actuated.

The

swivel

pinion

gets

in

mesh

with the

gear

ring.

The rotor

turning

gear

drives

the rotor at turning

speed

3.3

Disconnecting

the

Rotor Turning

Gear

Reverse

the

oil

supply

to

the

hydraulic

cylincler.

Swivel

pinion

is

put

out of

mesh

by spring

force.

Limit

swif

ches

Q2-23

-24) i

ndicate

position

"

di

sengaged

".

Switch

off

hydraulic motor.

When

accelerating

the turbine

from turning

speed

it

must

be

ensured

that

turning

gear

is

disconnected

and

swivel

pinion

is

disengaged

as

soon

as

turbine is

started.

(Lintit

switches

22-23 -24

indicate

position

"disengaged".

rt


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MATERTAL

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