|
Contents
| Introduction
| Symbols
Legend | Scheme
Book
Interlock
Application
- Precipitator Access
Scheme # 42B
To
allow operation of dual output transformer rectifiers
with one field removed from service and to prevent opening
any access doors of an electrostatic precipitator until
all power supplies are de-energized and properly grounded.
CLICK ON IMAGE FOR LARGER VIEW
All
main breakers in ESP control room are closed to supply
all transformer rectifiers. All A keys (A-1, A-2, A-3,
etc.) are held in L-O interlocks on the breakers. All
TR splitter switches are locked in the ON position. All
G keys (G1, G2, etc), NT and ST keys are held in the L-C
interlocks on the ground position of the TR splitter switches.
An additional A key for each main breaker is held in the
transfer panel (key exchange box). All access doors are
locked closed and all access door keys (DN & DS) are
held in the transfer panel.
To
access both "North" and "South" chambers:
|
|
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
|
Open breaker A-1.
Turn key A-1 in L-O interlock to lock breaker in
the open position. Key A-1 is now free.
Lock
open all other breakers and free all A keys (A-2,
A-3, A-4, etc.).
Insert all A keys in their respective L-C interlocks
on the "South" side of each TR splitter
switch and turn to unlock. All A keys are now held.
Rotate each TR "South" side splitter switch
handle to the ground position.
Turn the ST key in each L-C interlock locking each
switch handle in the ground position. All ST and
"South" side G keys are now free.
Insert all "South" side G keys (G1, G2,
etc.) into the transfer panel and turn to release
all A keys. The G keys are now held.
Remove all A keys and insert each key in the respective
L-C interlocks on the "North" side of
each TR splitter switch and turn to unlock. All
A keys
are now held.
Rotate each TR "North" side splitter switch
handle to the ground position.
Turn the NT key in each L-C interlock locking each
switch handle in the ground position. All NT and
"North" side G keys are now free.
Insert all NT and ST keys in the transfer panel
to release all DN and DS keys. Turn and remove the
DN and DS keys from the transfer panel.
Note: DN and DS keys are secondary keys and cannot
be removed until all primary keys (NT and ST keys)
are inserted and turned.
Insert the DN and DS keys in each access door interlock
to be opened and turn to unlock. The DN and DS keys
will remain held in each access
door interlock as long as the door is open.
|
To restore service to both chambers, close and lock all
access doors, return all DN and DS keys to the transfer
panel and reverse the above sequence.
CLICK ON IMAGE FOR LARGER VIEW
To
access the "North" chamber:
|
|
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
|
Open breaker A-1.
Turn key A-1 in L-O interlock to lock breaker in the
open position. Key A-1 is now free.
Lock open all other breakers and free all A keys (A-2,
A-3, A-4, etc.).
Insert all A keys in their respective L-C interlocks
on the "North" side of each TR splitter
switch. All A keys are now held.
Rotate each TR "North" side splitter switch
handle to the ground position.
Turn the NT key in each L-C interlock locking each
switch handle in the ground position. All NT and "North"
side G keys are now free.
Insert all "North" side G keys (G1, G2,
etc.) into the transfer panel and turn to release
all A keys. The G keys are now held. .
Insert all A keys in their respective L-O interlocks
on each main breaker and turn to unlock. The A keys
are now held.
Close all main breakers to energize the TR "South"
fields.
Insert all NT keys in the transfer panel to release
all DN keys. Turn and remove the DN keys from the
transfer panel. Note: DN keys are secondary
keys and cannot be removed until all primary keys
(NT keys) are inserted and turned.
Insert the DN keys in each access door interlock to
be opened and turn to unlock. The DN keys will remain
held in each access door interlock as
long as the door is open. |
To
restore service to the "North" chamber, close
and lock all access doors, return all DN keys to the transfer
panel and reverse the above sequence. The "South"
chamber can be accessed in the same manner.
CLICK ON IMAGE FOR LARGER VIEW
To
remove the TR1 "North" field from service, proceed
as follows:
|
|
1.
2.
3.
4.
5.
6.
7.
8.
|
Open breaker A-1.
Turn key A-1 in L-O interlock to lock breaker in open
position. Key A-1 is now free.
Insert key A-1 in the L-C interlock on the "North"
side TR1 splitter switch. Turn the key to unlock splitter
switch handle. Key A-1 is now held.
Rotate the TR1 "North" side splitter switch
handle to the ground position.
Turn the NT key in the L-C interlock locking the switch
handle in the ground position. The NT and G1 keys
are now free.
Insert and turn the G1 key into the transfer panel
to release the A-1 key. The G1 key is now held.
Insert the A-1 key in the L-O interlock on the main
breaker and turn to unlock. Key A-1 is now held.
Close breaker A-1 to energize the TR1 "South"
field. |
To
remove the TR1 "South" field from service and
reenergize the TR1 "North" field, proceed as
follows:
|
|
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
|
Open breaker A-1.
Turn key A-1 in the L-O interlock to lock breaker
in the open position. Key A-1 is now free.
Insert key A-1 in the L-C interlock on the TR1 "South"
side splitter switch. Turn the key to unlock the splitter
switch handle. Key A-1 is now held.
Rotate the TR1 "South" side splitter switch
handle to the ground position.
Turn the ST key in the L-C interlock locking the switch
handle in the ground position. The ST and G1 keys
are now free.
Insert the G1 key in the L-C interlock on the ground
position of the TR1 "North" side splitter
switch and turn the NT key to unlock. The NT and G1
keys
are now held.
Rotate the TR1 "North" side splitter switch
handle to the ON position.
Turn the A-1 key in the L-C interlock on the TR1 "North"
side splitter switch to lock the handle in the ON
position. The A-1 key is now free.
Insert the A-1 key in the L-O interlock on the main
breaker and turn to unlock. Key A-1 is now held.
Close breaker A-1 to energize the TR1 "North"
field. |
Other
TR fields can be removed from service in the same manner.
Reverse sequence to reenergize each field.
The
scheme above represents basic guidelines regarding the
proper interlock sequence for an Electro-Static Precipitator.
The equipment that comprises an E.S.P., or Baghouse can
vary depending upon the manufacturer and age of the equipment.
Let us know your specific needs and we will be glad to
provide a free proposal without obligation.
|
