Protective Relays
KILOVAC WD Series, DIN Rail or Screw Mounted Protective Relays
Product Facts
n WD25
Paralleling (Synch
Check) Relays
n WD2759
Relays
Over/undervoltage
Installation and Maintenance
Information
n WD32
Reverse Power
Relays
n WD47
Phase Sequence
Relays
n WD5051
Single- or
Three-Phase Overcurrent
Relays
n WD81OU
Over/
Underfrequency Relays
n File
E58048,
DIN EN50022-35
R
Users should thoroughly review the
technical data before selecting a product
part number. It is recommended that user
also seek out the pertinent approvals
files of the agencies/laboratories and
review them to ensure the product meets
the requirements for a given application.
The WD series offers
several different models
of protective relays in a
common package that is
suitable for either DIN rail
or screw mounting. These
flexible, multifunction
devices offer user selectable
voltages, sense currents
and frequencies. Adjustable
time delays are standard.
This allows a single part
number to be suitable
for multiple applications,
thereby reducing inventory
costs.
Installation — To mount the WD
series protective relay on a DIN rail,
hook the top edge of the cutout on the
base of the case over one edge of the
DIN rail, then press the opposite side
of the cutout containing the release clip
over the opposite side of the DIN rail.
To remove or reposition the relay, lever
the release clip and move the relay as
required. WD series relays should be
installed in a dry location where the
ambient temperature will be within the
operating temperature range.
Maintenance — WD series protective
relays are solid state devices that require
no maintenance. They are not designed
to be serviced by the user. Consult
KILOVAC customer service at 805-2202023 if repairs should be necessary.
Outline Dimensions
16 X M3.5
1.38
(35.0)
2.87
(73.0)
Specifications Common to
All Models
Power Consumption —
2.5VA, maximum.
Contact Ratings —
5 amps, resistive, at 120VAC.
5 amps, resistive, at 30VDC.
Isolation from Control to Sense
Inputs — 2,500VAC.
Mechanical Life —
10 million operations.
Shock — 10g.
Vibration — 0.062 (1.57) double
amplitude at 10-55 Hz.
Terminals — M3.5 screws.
Maximum Wire Size — 2 x 24 AWG
(2.5mm2) solid to DIN 46288 or 2 x 16
AWG (1.5mm2) stranded w/end sleeves.
Operating Temperature Range —
-40°C to +60°C.
Enclosure — Plastic case (not sealed).
Mounting Options — Snap mounts
on standard DIN rail (DIN-EN 50022-35)
or panel mounts with M4, M5, #8 or
#10 screws.
Weight — 14.4 oz. (400g) approximately.
AEROSPACE, DEFENSE & MARINE /// HIGH PERFORMANCE RELAYS
4.41
(112.0)
0.35
(9.0)
2.95
(75.0)
M5
M4
2.36
(60.0)
1.97
(50.0)
2.36
(60.0)
Protective Relays
KILOVAC WD25 Paralleling Relays
Product Facts
n Function
Sense Voltage
Voltage (nominal)
Synch Voltage (% of nom.)
Dead Bus Voltage (% of nom.)
25
n ANSI/IEEE
C37.90-1978
120 208 277 480
6 - 30% (≈ 4°- 20° electrical degree)
10 - 70% (Dead Bus)
Control Voltage
WD25 Operation
WD25 Specifications
WD25 paralleling relays
are used to ensure that two
circuits are synchronized.
When voltage, phase
relationship and frequency
are within the selected
synchronizing limits, the
output relay will energize.
The WD25 paralleling relay
allows for a generator to be
brought online without damage or system disturbance.
WD25 series with a “dead
bus” feature will energize for
a synchronized condition or
an “on line” generator, “dead
bus” condition. This “dead
bus” feature allows the generator to energize a dead
bus. The “double dead bus”
feature permits paralleling
of two buses when: (a) both
the line voltages are equal
and in phase, or (b) when
either bus is “hot” and the
other bus is “dead.”
Nominal Operating Range —
120, 208, 277 or 480 VAC, selectable.
Maximum Sensing Range —
575VAC.
Nominal Frequency Range —
40-400 Hz.
Contact Form — 2 form C (DPDT).
Model WD25
Input Voltage (VDC)
Input Voltage (VAC)
-0X1
18 to 54
—
-0X2
13.5 to 32
—
-0X3
100 to 200
100 to 140
WD25 Controls
WD25 Calibration
11
WD25 Connections
Protective Relays
The calibration marks on the faceplate
are provided only as guides. Proper
calibration requires using an accurate
voltmeter. Use the following procedure
to calibrate the WD25:
1. Remove the cover.
2. Adjust the SYNC VOLTAGE control
fully counterclockwise (CCW). Apply
nominal voltage to the LINE B (bus)
sensing terminals.
3. Apply the maximum desired
synchronization voltage to the LINE
A (generator) terminals. This voltage
should be in phase with LINE B (bus)
voltage and have the same frequency.
4. Slowly adjust the SYNC VOLTAGE
control clockwise (CW) until the relay
energizes.
WD25 Typical Hookup
Ordering Information
Typical Part Number
WD 25 -00 2
1. Basic Series:
WD = DIN mount Protective Relay.
2. Type:
25 = Paralleling Relay.
3. Dead Bus:
00 = Double Dead Bus
01 = Single Dead Bus
02 = Generator to Generator
4. Control Voltage:
1 = 18 to 54VDC
2 = 13.5 to 32 VDC
3 = 100-200VDC or 100-140VAC.
Our authorized distributors are more likely to stock these items.
WD25-001
WD25-013
NOTE: For single dead bus option,
connect the generator to 1 & 3 and
the bus to 5 & 7.
PAGE 3
Protective Relays
KILOVAC WD2759 Over/Undervoltage Relays
Product Facts
WD2759 Operation
n Function
WD2759 AC voltage sensing relays provide voltage
monitoring and protection
in AC systems from 50 to
400 Hz. Sensing voltages,
number of phases, over and
undervoltage setpoint, and
time delays are user configured. WD2759 voltage
relays operate when the
externally adjustable trip
point is reached. An external time delay control is
provided with an adjustment
of .5 to 10 seconds. This
time delay may be used to
prevent false tripping when
there are slight variations
in the voltage supply. On
overvoltage (OV) the output
relay energizes when the
input signal exceeds the
trip point. On undervoltage
(UV) the output relay energizes when the input signal
goes below the trip point.
A green LED indicates
power to the relay. Red
LED lights indicate the state
of the undervoltage and
overvoltage trips.
27/59
n ANSI/IEEE
C37.90-1978
Sense Voltage
Voltage (nominal)
UV Adjustment Range
OV Adjustment Range
120 208 277 480
72-120 125-208 166-277 288-480
120-168 208-291 277-388 480-672
Control Voltage
Model WD2759
Input Voltage (VDC)
Input Voltage (VAC)
-001
18 to 54
—
WD2759 Specifications
Nominal Operating Range —
120, 208, 277 or 480 VAC, selectable.
Maximum Sensing Range —
700VAC.
Nominal Frequency Range —
50-400 Hz.
Contact Form — 1 form C (SPDT) for
undervoltage and 1 form C (SPDT) for
overvoltage.
Time Delay Adjustment —
0.5 to 10 sec.
WD2759 Calibration
The calibration marks on the faceplate
have a maximum error of 10% and are
provided only as guides. Proper
calibration requires using an accurate
voltmeter in parallel with the input
signal. Use the following procedure to
calibrate your relay.
OVER VOLTAGE
1. Remove cover.
2. Adjust the TRIP SET control fully
clockwise (CW) and the TIME DELAY
control fully counterclockwise (CCW).
3. Apply the desired trip voltage to the
relay.
4. Slowly adjust the TRIP SET control
CCW until the relay trips.
Ordering Information
Typical Part Number
WD 2759 -002
1. Basic Series:
WD = DIN mount Protective Relay.
2. Type:
2759 = Over/Undervoltage Relay.
3. Control Voltage:
001 = 18 to 54VDC
002 = 13.5 to 32 VDC
003 = 100-200VDC or 100-140VAC.
Our authorized distributors are more likely to stock these items.
WD2759-003
AEROSPACE, DEFENSE & MARINE /// HIGH PERFORMANCE RELAYS
-002
13.5 to 32
—
-003
100 to 200
100 to 140
5. Remove the applied voltage (do not
change the voltage level) and set the
TIME DELAY control to the desired
time delay.
6. Apply the trip voltage to the relay and
measure the time to trip.
7. Adjust the TIME DELAY and repeat
steps 4 and 5 until you have the
desired time delay.
UNDER VOLTAGE
1. Remove cover.
2. Adjust the TRIP SET control fully
CCW and the TIME DELAY control
fully CCW.
3. Decrease the applied sensing voltage
from the nominal value until the
desired tripping voltage is reached.
4. Slowly adjust the TRIP SET control
CW until the relay trips.
5. Set the TIME DELAY control to the
desired time delay and apply nominal
voltage to the relay.
6. Step down the applied voltage from
nominal to a level jest below the trip
level set in Step 3 and measure the
time delay.
7. Adjust the TIME DELAY and repeat
steps 4 and 5 until the desired time
delay is achieved.
Protective Relays
KILOVAC WD2759 Over/Undervoltage Relays (Continued)
WD2759 Controls
WD2759 Connections
11
Protective Relays
WD2759 Typical Hookup
PAGE 5
Protective Relays
KILOVAC WD32 Reverse Power Relays
Product Facts
WD32 Operation
n Function
WD32 reverse power relays
are used to monitor the
direction of power from AC
generators. This is accomplished by measuring I
cos q. If current from the
generator is reversed and
exceeds the adjustable
setting, the relay will trip.
A 0.5 to 20 second time
delay is provided. A correct setting of the trip point
and time delay will prevent
motorizing the generator
and prevent tripping during
transients that occur while
synchronizing. A POWER
LED indicates the condition
of the power supply and a
REVERSE POWER TRIP
LED indicates the output
status of the relay.
32
Control Voltage
WD32 Specifications
Nominal Operating Range —
120 to 480 VAC, 1 or 3 phase.
Maximum Sensing Range —
575VAC.
Nominal Sensing Current — 5A.
Nominal Frequency Range —
WD32-00X — 40-400 Hz.;
WD32-01X — 60 Hz.
Contact Form — 2 form C (DPDT).
Time Delay Adjustment —
0.5 to 20 sec.
Sense Current — Reverse Power
Trip: 0.2 to 1.0A (4-20% of nominal
sense current).
Model WD32
Input Voltage (VDC)
Input Voltage (VAC)
-001
18 to 54
—
WD32 Calibration
The calibration marks on the faceplate
have a maximum error of 10% and
are provided only as guides. Proper
calibration requires using an accurate
Current Meter in series with the input
current. Use the following procedure to
calibrate your relay.
REVERSE POWER
1. Remove cover.
2. Adjust the TRIP SET control fully
clockwise (CW) and the TIME DELAY
control fully counterclockwise (CCW).
3. Apply the desired trip current to the
relay. NOTE: for the Reverse Power
(WD32-00X) a resistive load must
be used and for the Reverse kVAR
(WD32-01X) an inductive load must
be used.
4. Slowly adjust the TRIP SET control
CCW until the relay trips.
5. Remove the applied Current and
set the TIME DELAY control to the
desired time delay.
6. Re-apply the Current (10% more
than the trip current) to the relay and
measure the time to trip.
7. Adjust the TIME DELAY and repeat
steps 4 and 5 until you have the
desired time delay.
Ordering Information
Typical Part Number
WD 32 -00 2
1. Basic Series:
WD = DIN mount Protective Relay.
2. Type:
32 = Reverse Power Relay.
3. Load:
00 = Resistive (power)
01 = Inductive (kVAR, 60 Hz.)
4. Control Voltage:
1 = 18 to 54VDC
2 = 13.5 to 32 VDC
3 = 100-200VDC or 100-140VAC.
Our authorized distributors are more likely to stock these items.
WD32-003
WD32-011
AEROSPACE, DEFENSE & MARINE /// HIGH PERFORMANCE RELAYS
-002
13.5 to 32
˜
-003
100 to 200
100 to 140
Protective Relays
KILOVAC WD32 Reverse Power Relays (Continued)
WD32 Controls
WD32 Connections
11
Protective Relays
WD32 Typical Hookup
PAGE 7
Protective Relays
KILOVAC WD47 Phase Sequence Relays
Product Facts
n Function
Control Voltage
Model WD47
Input Voltage (VDC)
Input Voltage (VAC)
47
n ANSI/IEEE
C37.90-1978
WD47 Operation
WD47 Specifications
WD47 phase sequence
relays are designed to
monitor the correct phase
rotation and loss of phase
of three phase ac systems
from 50 to 400 Hz. An
incorrect phase sequence or
loss of any phase will cause
the WD47 to pickup. When
the phase sequence is corrected or the lost phase is
restored the
contacts dropout. Red
LED’s light to indicate a fault
condition. A green LED
indicates power to the relay.
The WD47 is often used to
detect reverse phase rotation or loss of phase to generators, busses, motors, and
transformers.
Nominal Operating Range —
120 to 480 VAC.
Maximum Sensing Range —
575VAC.
Nominal Frequency Range —
40-400 Hz.
Contact Form — 2 form C (DPDT).
WD47 Controls
WD47 Calibration
The WD47 has no adjustments and
no calibration is necessary. Proper
operation may be verified as follows:
1. Apply a nominal, three-phase input
with the correct phase sequence.
The output relay should dropout and
the green LED should light.
2. Apply a nominal, three-phase input
with an incorrect phase sequence.
The output relay should pickup and
the red LED should light.
3. Apply only one or two phases with
the correct phase sequence. The
output relay should pickup and the
red LED should light.
WD47 Connections
WD47 Typical Hookup
Ordering Information
Typical Part Number
WD 47 -002
1. Basic Series:
WD = DIN mount Protective Relay.
2. Type:
47= Phase Sequence Relay.
3. Control Voltage:
001 = 18 to 54VDC
002 = 13.5 to 32 VDC
003 = 100-200VDC or 100-140VAC.
Our authorized distributors are more likely to stock these items.
WD47-001
AEROSPACE, DEFENSE & MARINE /// HIGH PERFORMANCE RELAYS
-001
18 to 54
—
-002
13.5 to 32
—
-003
100 to 200
100 to 140
Protective Relays
KILOVAC WD5051 1Ø and 3Ø Overcurrent Relays
Product Facts
WD5051 Operation
n Function
WD5051 AC current sensing relays provide current
monitoring and protection
in AC systems from 50 to
400 Hz. Nominal Sensing
Current, Instantaneous Over
Current setpoint, Time Over
Current setpoint, and Time
Over Current time delay are
user configured. WD5051
current relays operate when
the externally adjustable
trip point is reached. An
external time over current
time delay control is provided with an adjustment
of .5 to 20 seconds. This
time delay may be used to
prevent false tripping when
there are slight variations
in the sensed current. With
control power applied, the
Instantaneous Over Current
(IOC) contacts pick-up when
the input signal exceeds the
IOC trip setpoint. Similarly,
with control power applied,
the Time Over Current
(TOC) contacts pick-up after
the preset time delay when
the Sense Current rises
above the TOC trip setpoint.
The IOC contacts may also
be configured to function as
an under current relay. A
green LED indicates power
to the relay. Red LED lights
indicate the state of the IOC
and TOC trips.
5051
Sense Current
Current (nominal) 1 3 6 8
IOC
0.2 to 1.2 0.6 to 3.6 1.2 to 7.2 1.6 to 9.6
TOC
0.2 to 1.2 0.6 to 3.6 1.2 to 7.2 1.6 to 9.6
Control Voltage
Model WD5051
Input Voltage (VDC)
Input Voltage (VAC)
-001
18 to 54
—
-002
13.5 to 32
—
-003
100 to 200
100 to 140
WD5051 Calibration
The calibration marks on the faceplate
are provided only as guides. Proper
calibration requires using an accurate
ammeter in series with the current
source. Use the following procedure to
calibrate your relay:
OVERCURRENT
1. Remover the cover.
2. Adjust the TRIP SET control fully
clockwise (CW) and the TIME DELAY
control (TOC only) fully counterclockwise (CCW).
3. Apply the desired trip current to the
relay.
4. Slowly adjust the TRIP SET control
CCW until the relay trips.
5. Remove the applied current (do not
change the current level). Set the
TIME DELAY (TOC only) control to
the desired time delay.
Ordering Information
Typical Part Number
WD 5051 -002
1. Basic Series:
WD = DIN mount Protective Relay.
2. Type:
5051 = Single Phase Overcurrent Relay.
5051-3 = Three Phase Overcurrent Relay.
3. Control Voltage:
001 = 18 to 54VDC
002 = 13.5 to 32 VDC
003 = 100-200VDC 0r 100-140VAC.
Our authorized distributors are more likely to stock these items.
WD5051-001
WD5051-003
WD5051-3-001
PAGE 9
11
Protective Relays
WD5051 Specifications
Sense Current Full Scale — 1, 3, 6
or 8A, selectable.
Maximum Sensing Current —
10A continuous; 30A for 10 sec.;
60A for 2.5 sec.; 100A for 0.9 sec..
Nominal Frequency Range —
50-400 Hz.
Contact Form — 1 form C (SPDT) for
IOC and 1 form C (SPDT) for TOC.
TOC Time Delay Adjustment —
0.5 to 20 sec.
IOC Operate Time (max.) —
0.2 sec.
Protective Relays
KILOVAC WD5051 1Ø and 3Ø Overcurrent Relays (Continued)
WD5051 Controls
WD5051 Connections
WD5051
Single Phase Model
WD5051-3
Three Phase Model
WD5051 Typical Hookup
WD5051
Single Phase Model
AEROSPACE, DEFENSE & MARINE /// HIGH PERFORMANCE RELAYS
WD5051-3
Three Phase Model
