Technical Data 280-20
Effective July 2014
Supersedes January 1990
Types D and DV single-phase
hydraulically controlled recloser
Types D and DV single-phase automatic circuit
reclosers from Eaton’s Cooper Power Systems
provide reliable, economical overcurrent protection
for distribution systems. Designed for 15 kV (Type
D) and 15-34.5 kV (Type DV) system applications
such as sectionalizing single-phase branches of
three-phase feeders, the reclosers’ high continuous
current and interrupting capacity enables them
to be used on heavily loaded circuits with high
available fault currents.
Types D and DV reclosers provide single-phase
load protection, tripping, and automatic clearing
of temporary faults to minimize downtime and
simplify troubleshooting. They are compact and
self-contained in operation, can be pole-mounted
or installed in substations, and utilize the serviceproven Eaton’s Cooper Power Systems hydraulic
control. Types D and DV reclosers can be easily
coordinated with circuit breakers, sectionalizers,
fuses, and other reclosers in the distribution
system.
Eaton’s Cooper Power Systems reclosers in a
distribution system protection scheme offer
significant user advantages. Their broad application
capabilities permit the user to select exactly
the right recloser for the protection required.
When needed, Eaton’s Cooper Power Systems
application expertise – backed by world-wide
recloser application experience – is readily
available. Knowledgeable design capability – based
on 45 years of recloser manufacturing experience
– provides the operating features required for
effective overcurrent protection of complex
distribution systems. Progressive development
programs using the latest technologies have
resulted in modern, efficient reclosers from
Eaton’s Cooper Power Systems, designed and built
in accordance with ANSI® Standard C37.60.
Accessories are available for Types D and DV
reclosers that permit tailoring a recloser to specific
application requirements. Mounting equipment for
pole and substation permits recloser installation
precisely where system requirements demand its
protection.
Technical Data 280-20
Types D and DV single-phase reclosers
Effective July 2014
Basic ratings
Type D reclosers protect systems rated 2.4 through 14.4 kV and
Type DV reclosers protect systems rated through 34.5 kV. Table 1
summarizes the ratings of the Types D and DV reclosers. For basic
ratings and application information for all reclosers from Eaton’s
Cooper Power Systems, see Technical Data 280-05, General Ratings
Information and Catalog Guide for Single-Phase and Three-Phase
Reclosers.
4. Delayed time-current curve: B, C, D, or E (Refer to time-current
curves in Reference Data R280-91-4).
5. Number of delayed operations: 0,1, 2, 3,or 4.
6. Closing coil voltage code (select from Table 2.)
Table 2. Closing Coil Voltage Code Numbers
Basic characteristics
Types D and DV reclosers are hydraulically controlled protective
devices in which tripping is initiated by a series-trip coil that releases
the stored-energy trip mechanism when an overcurrent occurs.
Current carrying and interrupting capacities depend on the current
rating of the series trip coil. Minimum-trip current is 200% of the
coil rating except X coil ratings which initiate tripping at 140%. A
closing solenoid supplies the energy for contact closing and also
stores energy in the trip mechanism. High-voltage closing solenoids
are connected to the system on the source-side of the recloser.
Solenoid voltage rating is based on the system operating voltage.
Low-voltage closing solenoids can be used if auxiliary voltage is
supplied to the recloser. Dual time-current characteristics permit
coordinating Types D and DV reclosers with other protective
devices on a distribution system. Fast-curve operations are followed
by trip operations on a delayed curve. A choice of four delayed
characteristics allows flexibility in system coordination.
Oil interruption
Types D and DV reclosers use oil as the arc-interrupting medium.
Movable bridge-type contacts provide two breaks in series.
Separate self-generating interrupter chambers at each of the two
breaks effectively interrupt all current from minimum load to rated
maximum fault.
Surge protection
Best operating results are achieved if reclosers are protected
with surge arresters. On line applications, arrester protection is
recommended on both sides of the recloser. (If protection is on one
side only, it should be on the source-side.) In substations, arresters
should be on the load-side. Arresters provide excellent protection
and are available with mounting brackets to fit Eaton’s Cooper Power
Systems reclosers; see Technical Data 235-99, UltraSIL™ PolymerHoused Evolution™ Surge Arrester or Technical Data 235-35,
UltraSIL Polymer-Housed VariSTAR™ Surge Arrester for information.
Phase-to-Grounded Neutral Closing
Coil Operating Voltage ± 15% (kV)
Code
Number
2.4
21
4.16-4.8
22
7.2-7.62
23
8.0-8.32
24
14.4
27*
20.0
29*
Low-Voltage Closing Coils** (Vdc)
125
26
250
28
*
For Type DV reclosers only.
**
When dc coils are selected also specify KA136D for installation. For ac closing, specify a rectifier
accessory from Table 4 in place of KA136D.
Example
To order a basic Type D recloser with a 400-amp trip coil, minimumtrip current of 140% of continuous current rating, a B time-current
curve, and two fast and two delayed operations before lockout for
service on a 4.8-8.32-kV grounded-wye system, the catalog number
should be constructed like this:
KD Basic letters for a Type D recloser.
Basic letters for a Type DV recloser: KDV.
400
Continuous current rating of series trip coil: 100, 140, 160,
185,225, 280,400 or 560 amps. (Minimum-trip is 200%
of continuous ratings.)
X
B
Table 1. Basic Ratings
Delayed time-current curve desired: B, C, D,
or E. If all fast operations are desired, insert
letter A.
2
Recloser
Type
Normal
Voltage
(kV)
Maximum
Continuous
Current (amps)
Maximum Interrupting
Rating at Normal
Voltage
(symmetrical amps)
D
14.4
560
10000*
DV
34.5
560
8000
* Ratings are higher at lower voltage; see Table 8.
Ordering information
To order a basic Type D and DV recloser, use the chart to the right
and Table 2 to construct a catalog number that describes the
required recloser. Order accessories and mounting equipment from
Tables 3 through 5.
Construction of catalog number requires:
1. Recloser type: D or DV.
2. Series trip-coil continuous current rating.
3. If 400- or 560-amp coil is used, choose trip current level of 140
or 200%.
2
Insert letter X only if 400- or 560-amp coil is to
have minimum trip current approximately 140% of
continuous rating; otherwise omit letter. (Minimumtrip current of 400X coil is 560 amps;minimum-trip
of 560X coil is 750-amps.)
www.cooperpower.com
Number of fast A-curve operations:
0,1,2,3, or 4.
2
Number of delayed operations:
0,1,2,3, or 4.
22
Closing coil voltage code number
selected from Table 2 for the
system on which recloser is
22 to be used .
B
2
2
KD 400 X
Fast + delayed operations not to exceed four.
KD400XB2222 is the catalog number for the required basic recloser.
Table 3. Multi-Ratio Bushing-Current Transformers
for Field Installation 600:5 for Metering
Description
Catalog Number
Slip-on bushing current transformer kit; one CT per kit
KA712L2
Technical Data 280-20
Types D and DV single-phase reclosers
Effective July 2014
Table 4. Low Voltage Closing and Wiring
Description
Catalog Number
Low voltage D.C. closing accessory
KA136D
115-Vac rectifier to supply 125 Vdc coil
KA137D1
230-Vac rectifier to supply 250 Vdc coil
KA137D3
Low voltage cable, 20 feet
KA139DV20*
Table 5. Mounting Equipment
Description
Catalog Number
Pole-mounting cluster-type frame for Three Type Reclosers
DT8C1*
* Refer to Catalog 280-85 for additional ordering information.
Basic recloser design
Eaton’s Cooper Power Systems Types D and DV hydraulically
controlled, single-phase reclosers (Figures 1 and 2) are designed
to protect circuits on systems operating through 34.5 kV. With the
ratings available and the ability of these reclosers to coordinate with
other protective devices – including lower-rated reclosers – they can
be applied in a variety of protection schemes.
The hydraulic control incorporates separate elements to govern time
delay operations and regulate the number of operations to lockout.
The basic design of the Types D and DV reclosers has been proven
by more than 30 years of field service.
Construction
Like all the other reclosers from Eaton’s Cooper Power Systems,
Types D and DV reclosers are designed for long service with
little maintenance. Heads are aluminum castings and the tanks
are constructed of heavy-gage steel. The tanks are treated with
a corrosion inhibiting epoxy primer, followed by a finish coat of
thermosetting acrylic paint. A Buna N o-ring gasket is confined in a
groove in the head casting to assure an oil-tight seal between the
head and the tank.
The entire internal mechanism is suspended from the head casting
so that the mechanism and the head assembly can be removed
from the tank as a unit to simplify servicing. The head casting can
be rotated with respect to the tank, in 60-degree increments, for
optimum positioning of bushing terminals and manual operating
handles. The insulating supports from which the interrupter and
internal mechanism are suspended are constructed of filament
wound glass epoxy for high electrical and mechanical strength and
moisture resistance.
Closing energy is supplied by a closing solenoid which
simultaneously charges the opening springs in preparation for a
tripping operation. Fault currents are sensed by a trip solenoid
(connected in series with the recloser contacts) that initiates the
tripping operation by releasing the opening springs.
Series tripping provides simple and reliable operation since the
energy to initiate the tripping operation is taken directly from the
line. Types D and DV reclosers are self-contained; i.e., they require
no external control or control power source.
UNIVERSAL CLAMP TYPE
TERMINALS
Accept copper or aluminum
conductors horizontally or
vertically
LIFTING STRAP
Facilitates hoisting during
installation and maintenance
COVER-CLAMPED BUSHINGS
Wet-process porcelain; can be
field-replaced
OPERATIONS COUNTER
Records all recloser trip
operations
GROUND TERMINAL
Provides easy connection to
grounded neutral
HEAD CASTING
Supports bushings and operating
mechanism; can be rotated in 60-degree
increments to conveniently orient bushings
and sleet hood.
INFORMATION PLATE
Provides recloser ratings
SLEET HOOD
Houses manual operating handle,
non-reclosing lever, and operations
counter
MANUAL OPERATING HANDLE
Provides indication of locked-out
recloser; permits opening and
closing to be manually initiated.
NON-RECLOSING LEVER
Provides one shot to lockout after
fault interruption
Figure 1. Construction features, operating levers, and indicators for Types D and DV reclosers.
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3
Technical Data 280-20
Types D and DV single-phase reclosers
Effective July 2014
HEAD MECHANISM
Includes opening springs
and mechanical linkages
TIME-DELAY UNIT
Establishes delayed timecurrent characteristics
SEQUENCE SELECTOR CAM
Establishes sequence of fast and
delayed operations
CLOSING SOLENOID
Operates recloser and
charges opening springs
SERIES-TRIP SOLENOID
Senses overcurrents, inhales
tripping
HYDRAULIC INTEGRATOR
Counts number of operations,
initiates delayed operations
and lockout after preset
sequence
Closing Solenoid
Closing energy – as well as the energy to
charge the opening springs – is supplied by
a high-voltage closing solenoid Figures 3 and
4) connected phase-to-ground on the sourceside of the Type D and DV recloser.
SOURCE
RECLOSER HEAD
LOAD
CLOSING
SOLENOID
CONTACTOR
CLOSING
SOLENOID
CLOSING SOLENOID
CONTACTOR
Momentarily energizes
solenoid for closing operation
FUSE
Protects system in event
of coil failure
INSULATION SUPPORTS
Fiberglass construction
INTERRUPTERS
Self-generating; vented for
fast arc extinction
SERIES
TRIP
COIL
FUSE
MAIN CONTACTS
Figure 3. Phase-to-ground connection of
high-voltage closing solenoid.
MOVING CONTACTS
Copper-tungsten alloy tips
for long life
Figure 2. Untanked view of Type D recloser (shown with head casting removed).
Construction of Type DV is similar.
Series-trip solenoid
Sensing of fault currents in Types D and DV reclosers is provided
by a trip solenoid which is connected in series with the recloser
contacts and can carry line current up to its rating. Continuous
current and minimum-trip values can be changed by replacing the
coil. Coils used in Types D and DV reclosers are interchangeable (see
Table 2).
When fault current flows in excess of the minimum trip rating, the
trip solenoid plunger – normally held at rest by the mechanism – is
drawn into the coil by the magnetic effect generated by the fault
current. Near the end of the downward stroke, a linkage connected
to the solenoid plunger trips a latch which releases the charged
opening springs and the recloser contacts are opened. The seriestrip coil is effectively surge-protected by a shunting bypass gap on
reclosers with trip coils rated below 100 amps.
Figure 4. High-voltage closing solenoid
contactor.
4
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Technical Data 280-20
Types D and DV single-phase reclosers
Effective July 2014
The aluminum cover casting is marked to designate bushings to
aid in making the proper connections. The grounded side of the
solenoid is connected to a connector on the cover. The phase-toground connection permits Types D and DV reclosers to function
independently of outside control power, although application is
limited to multigrounded-wye systems. A low-voltage closing
solenoid, energized by an auxiliary ac or dc low-voltage source, is
also available, permitting application of Types D and DV reclosers on
other than grounded-neutral systems.
RESETTING ARM AND
PLUNGER
Dumps oil from under
lockout piston after lockout
so recloser can immediately
reset to begin another series
of operations
HYDRAULIC PUMP
Acts as an accurate trip
counter by pumping
measured amount of oil
under lockout piston
When the recloser contacts are closed, the solenoid closing plunger
is latched in the down position. This latch is tripped simultaneously
with the release of the opening springs and as the solenoid plunger
moves upward. A timing orifice in the bottom of the solenoid-plunger
cylinder regulates the rate at which upward movement can take
place as oil is drawn into the cylinder.
As the solenoid plunger reaches the top of its stroke, the highvoltage line contactor energizes the closing solenoid, pulling the
plunger down. The closing solenoid contactor opens de-energizing
the coil and through the mechanical linkage, the main contactoperating rods are simultaneously moved upward to close the
contacts. At the same time, the opening springs are charged in
preparation for a tripping operation.
LOCKOUT PISTON
Advances to lockout
according to presetting with
each recloser trip
Figure 5. Cutaway view of hydraulic integrator.
Hydraulic control system operation
The number and sequence of operations to lockout and time-delay
operations of Types D and DV reclosers are controlled by two
separate, sealed hydraulic mechanisms which are mechanically
linked. These sealed units contain HFA hydraulic fluid and have
extremely consistent and accurate operating characteristics.
Hydraulic integrator − pump and lockout piston assembly
The hydraulic integrator (Figure 5) containing the hydraulic pump
and lockout piston, regulates the number of fast and delayed trip
operations, counts the operations to lockout, and initiates lockout
after a preset number of operations. The hydraulic pump (Figure 5) is
linked to the closing-solenoid plunger and is pushed downward with
each return operation of the plunger. With its downward stroke, the
pump forces a measured amount of fluid under the lockout piston
(Figure 5), causing it to rise one step. Ball-type check valves retain
the charge. When the closing coil is energized, the recloser contacts
close and the pump returns to its normal position.
The integrator mechanism is linked to the time-delay unit through
the cam shown in Figure 6. Upward movement of the lockout piston
causes the cam to rotate counterclockwise. After the number of fast
operations preset on the cam, it has advanced to engage the roller
mechanism located at left of the cam. This brings the time-delay unit
into operation. When the lockout piston reaches the top of its stroke,
it trips the lockout latch through another set of linkages, and a spring
locks out the recloser contacts.
On the lockout operation, the resetting lever (Figure 5) raises the
plunger to which it is linked. This releases the ball check-valve
beneath the plunger, hydraulic fluid is withdrawn from beneath the
lockout piston, and it quickly resets. After the recloser is reset from
lockout, it is ready for another full sequence of operations.
For temporary faults that are cleared before the recloser mechanism
reaches lockout, the lockout piston resettles through a combination
of spring action and fluid bleeding past the piston to reset the
integrator mechanism.
ROLLER ASSEMBLY
SEQUENCE
SELECTOR CAM
TIME-DELAY UNIT
LOCKOUT LEVER
INTEGRATOR
SERIES TRIP LINKAGE
CLOSING
SOLENOID PLUNGER
Figure 6. Hydraulic integrator and time-delay linkage.
Operating settings
The required sequence of fast and delayed operations and the
required number of operations to lockout are factory set per
customer specification. Either or both settings are easily changed
in the field; only partial untanking of the recloser is necessary and
no special tools are needed. Internal settings for the number of
operations to lockout permit the recloser to be programmed for
two, three, or four trip operations before lockout. To set the number
of operations to lockout, the lockout lever (Figure 6) is indexed to
one of three holes in its assembly, corresponding to the number of
desired operations.
The number of fast operations in the sequence is established by
indexing the sequence selector cam shown in Figure 6. The cam is
simply rotated until the desired number of fast operations appears
opposite an arrow above the cam. An indent holds the cam in the
selected position.
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5
Technical Data 280-20
Types D and DV single-phase reclosers
Effective July 2014
Setting the number of fast operations
determines the number of delayed
operations in the sequence to lockout;
for example, if four operations to lockout
have been selected and the cam has
been adjusted for two fast operations, the
sequence will be two fast, followed by two
delayed operations.
Programming for one operation to lockout is
done with the external non-reclosing handle,
located under the sleet hood. Moving the
external non-reclosing handle down activates
the non-reclosing feature (one operation to
lockout). This overrides the internal setting,
but does not change it physically. When the
non-reclosing feature is deactivated (handle
moved up), the number of operations to
lockout automatically reverts to the internal
setting, providing complete flexibility for
testing or service without disturbing the
programmed operations-to-lockout setting.
TIME-DELAY ARM
SOLENOID LINKAGE
ENGAGEMENT ARM
TIME-DELAY ARM PIN
BRACKET
THUMBSCREW
BRACKET HOLES FOR
ALTERNATE CURVE
TIME-DELAY UNIT PIN
Time-delay mechanism
Delayed operations of the Types D and DV
reclosers are established by the hydraulic
time-delay mechanism which engages the
series trip-solenoid linkage after the preset
number of fast operations. The time-delay
mechanism impedes the downward stroke of
the series trip-solenoid linkage to provide the
desired delayed time-current characteristic.
The selected curve is established by the
amount of engagement during the downward
stroke of the time-delay mechanism. For
a B or D curve, approximately half of the
stroke is unimpeded; then the trip solenoid
linkage engages the time-delay mechanism,
impedes the remainder of the stroke and
establishes the desired curve. With slower
C or E curves, the amount of engagement is
increased.
The time-delay mechanism offers a choice
of two characteristics: B and C, or D
and E. The desired combination must be
specified since one unit does not provide
all four characteristics. Adjustment from
one characteristic to the other is made
by indexing a thumbscrew and bracket
arrangement on the time-delay unit. This
changes the curve by changing the amount
of engagement (Figure 7).
Establishing delayed
operations
Operation of the time-delay mechanism
is initiated by the hydraulic integrator. As
sequence selector cam (Figure 6) is rotated
counterclockwise by the upward movement
of the lockout piston, it engages the roller
assembly causing the solenoid linkage
engagement arm to pivot clockwise, placing
its hook above the pin on the time-delay
arm. When a delayed tripping operation
occurs and the engagement arm moves
downward with the trip-solenoid linkage, its
hook engages a pin on the time-delay arm
and the time-delay mechanism impedes the
remainder of the stroke (Figure 7).
6
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Figure 7. Changing time-current characteristic to the alternate curve is accomplished
by loosening the thumbscrew and indexing the pin on the time-delay unit to the
bracket hole for the alternate curve.
Figure 8. Schematic of time-delay mechanism.
Technical Data 280-20
Types D and DV single-phase reclosers
Effective July 2014
Operation
The hydraulic time-delay mechanism piston (Figure 8) is pulled
downward by the trip-solenoid linkage. A floating plate (retained by
an open basket) at the bottom of the hollow piston functions as a
one-way valve on the downstroke, sealing the bottom of the piston.
Table 6. Electrical Ratings
Description
Type D
Type DV
Nominal system voltage (kV)
2.4 -14.4
24.9 - 34.5
On low-current operations, displaced oil is forced around the greased
pin of the low-current timing valve and is allowed to return to the
space above the piston. When a higher current fault is experienced,
increased oil pressure raises the spring-loaded valve so that oil
flows through both valves and the tripping operation is accelerated
proportionately. The hydraulic time-delay mechanism has no effect
on contact-opening speed – it only delays the moment at which the
opening springs are released.
Maximum rated voltage (kV)
15.5
38
Rated impulse withstand voltage (BIL) (kV crest)
110
150
Dry, one min
50
70
Wet, ten sec
45
60
Reclosing time (sec)
2
2
Oil interrupter construction
Bushing creepage distance (in.)
11-5/8
17
Fast arc interruption (down to 2.7 cycles clearing) is achieved by
bridge-type contacts that provide two current breaks in series. The
bayonet-type moving contacts are silver-plated tungsten alloy for
erosion resistance and good conductance.
Table 7. Duty Cycle
The stationary contact assemblies are tulip-type clusters of silverplated contact fingers held together by garter springs. The contacts
are self-cleaned by the opening and closing wiping action.
Each current break is provided with a self-generating-type arc
interrupter structure (Figure 9) which includes a series of vented
chambers. As the contacts open, the arc generates gap pressure in
the upper chamber which blasts oil across the arc and out through
the vents. As a result, arc extinction is fast and arc energy levels do
not increase as fast at the higher fault-current levels.
60 Hz withstand (kV rms)
% of
Interrupting
Rating
Recloser Type
D
Maximum
Circuit
X/R Ratio
15-20
28
3
45-55
20
7
90-100
10
14
Total 58
DV
Mounting equipment
Types D and DV reclosers are furnished with two sets of mounting
adapter plates for pole or substation mounting. For direct pole
mounting, the curved plates are installed between the pole and the
mounting brackets of the recloser. For mounting on a substation
truss or pole-mounted channel, add the flat adapter plates between
the curved plates and the mounting surface. An accessory clustertype frame for mounting three Type D reclosers is also available. See
Table 5 on page 3 for ordering information.
Number of
Unit Operations
15-20
28
4
45-55
20
8
90-100
10
15
Total 58
Table 8. Interrupting Ratings
Tripe Coil
Ratings
Continuous
(amps)
Minimum
Trip
Ratings
(amps)
Interrupting Ratings
(rms symmetrical amps)
Type D
@4.8 kV
Type DV
@8.32 kV
@14.4 kV
@24.9-34.5 kV
100
200
6000
6000
6000
6000
140
280
8400
8400
8400
8000
160
320
9600
9600
9600
8000
185
370
11100
10000
10000
8000
225
450
12000
10000
10000
8000
280
560
12000
10000
10000
8000
400
800
12000
10000
10000
8000
400X
560
12000
10000
10000
8000
560
1120
12000
10000
10000
8000
560X
750
12000
10000
10000
8000
Figure 9. General construction of self-generating interrupter
used on Types D and DV reclosers.
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7
Technical Data 280-20
Type D and DV single-phase reclosers
Effective July 2014
Dimensions and weights
Figure 10. Dimensions of Type D (left) and Type DV (right) reclosers.
Table 9. Weights and Oil Capacities
Type
Weight with oil (lbs)
Oil Capacity (gal)
D
430
20
DV
556
30
Eaton
1000 Eaton Boulevard
Cleveland, OH 44122
United States
Eaton.com
Eaton’s Cooper Power Systems Business
2300 Badger Drive
Waukesha, WI 53188
United States
Cooperpower.com
© 2014 Eaton
All Rights Reserved
Printed in USA
Publication No. 280-20
July 2014
Eaton, Cooper Power Systems, UltraSIL,
VariSTAR, and Evolution and are valuable
trademarks of Eaton in the U.S. and other
countries. You are not permitted to use the
these trademarks without the prior written
consent of Eaton.
ANSI® is a registered trademark of American
National Standards Institute.
For Eaton’s Cooper Power
Systems Types D and DV
reclosers product information
call 1-877-277-4636 or visit:
www.cooperpower.com.