EPOCH-II
®
High-Current Output Unit
■
1000 VA of high current
■
Rugged, portable test set
■
Up to 187 Amperes maximum output
EPOCH-II
High-Current Output Unit
DESCRIPTION
The EPOCH-II
®
is a high-current output unit designed to
be controlled by the PULSAR
®
in combination with the
High-Current Interface Module to produce a rugged,
portable high-current, high-volt/ampere test set.
The EPOCH-II also is designed to be controlled by the
EPOCH-10
®
Relay Test Set.
PULSAR/EPOCH-II or EPOCH-10/EPOCH-II combination
uses microprocessor-based, digitally synthesized sine wave
generators and solid-state regulated power amplifiers to
provide sinusoidal voltage and current outputs with
precise control of the phase-angle relationships.
These combinations will produce accurate test results even
with a fluctuating power source or when testing nonlinear
or highly saturable relays.
An optional IEEE-488 GPIB interface transforms the
EPOCH-10/EPOCH-II combination into a programmable
automatic test system when used with an external
controller or computer. Amplitude and/or phase angle can
be set to desired values, step changed, ramped, or pulsed
to new values.
APPLICATIONS
PULSAR/EPOCH-II or EPOCH-10/EPOCH-II combination is
designed to test both complex protective relays which
require phase-shifting capability and simpler relays,
including all overcurrent relays.
The table above lists the different types of relays by
device numbers, and the different combinations of a
PULSAR or EPOCH-10s and an EPOCH-II required to test
them.
FEATURES AND BENEFITS
■
Output current source has a 5-minute duty cycle rating
of 1000 volt-amperes.
■
Four output ranges at 0.01 ampere and two output
ranges at 0.1 ampere are provided.
■
Tough steel, sealed enclosure provides a high shock
and vibration resistance.
■
Completely compatible with PULSAR via the HighCurrent Interface Module and the EPOCH-10 units.
Device No. Relay Types Specify
One EPOCH-II and PULSAR
with High-Current Interface
Module or one EPOCH-10
One EPOCH-II and PULSAR
with Interface Module or two
EPOCH-10s
Instantaneous Overcurrent up
to 187 A at 1000 VA
Directional Overcurrent up to
187 A at 1000 VA
All of the above plus. . .
Differential
Distance
(open-delta)
50
67
87
21
One EPOCH-II and PULSAR
with Interface Modules or
three EPOCH-10s
Distance (wye)
21
Ground Directional
Overcurrent up to 187 A at
1000 VA
67N
Overcurrent up to 187 A at 1000 VA
51
EPOCH-II with EPOCH-10 control unit
EPOCH-II
High-Current Output Unit
SPECIFICATIONS
Input
Input Voltage (specify one)
115 V ±10%, 50/60 Hz, 30 A (at full rated output)
OR
230 V ±10%, 50/60 Hz, 20 A
Output
Output Current
To provide a variety of test circuit impedances, six output taps
with two ranges are provided.
High Range
2.00 to 10.00 A at 100 V max
3.00 to 15.00 A at 66.6 V max
8.00 to 40.00 A at 25 V max
10.00 to 50.00 A at 20 V max
20.00 to 100.0 A at 10 V max
34.00 to 170.0 A at 5.9 V max
Output Power: 1000 VA
Low Range
2.00 to 10.00 A at 50 V max
3.00 to 1 5.00 A at 33.3 V max
8.00 to 40.00 A at 12.5 V max
10.00 to 50.00 A at 10 V max
20.00 to 100.0 A at 5 V max
34.00 to 170.0 A at 2.95 V max
Output Power: 500 VA
Accuracy
Typical: ±0.5% of setting
Maximum: ±1.0% of setting
Alarm will indicate when amplitude, phase angle, or waveform is
in error.
Resolution
Four ranges: 0.01 A
Two ranges: 0.l A
Duty Cycle
Five minutes at full rated VA output. Fifteen minutes recovery
time.
Overrange Capability
The EPOCH-II has an overrange capability of +10% for each tap
with a maximum output current of 187 A on the 170 A tap.
Distortion
Less than 1% typical, 3% max.
Output of EPOCH-10/EPOCH-II Combination
Frequency
■ Synchronized to input power source
■ 60 Hz crystal-controlled
■ 50 Hz crystal-controlled
Accuracy
■ Synchronized, tracks input frequency
■ ±0.006 Hz for 60-Hz crystal control (±001%)
■ ±0.005 Hz for 50-Hz crystal control (±0.01%)
Output of PULSAR and Interface Module Connected to EPOCH-II
The High-Current Interface Module provides a variable frequency
signal to the Epoch-II High-Current Output Unit.
Output frequency is continuously displayed for each channel with
large, high-intensity LEDs with the following ranges:
5.000 to 99.999 Hz
100.01 to 999.99 Hz
Frequency Accuracy: ±10 ppm at 23° C, ±2° C)
Current Phase Angle Control
Angle is adjusted on the EPOCH-10 control unit by 4-digit,
pushbutton control with large LED display of setting.
Range: 0.0 to 359.9°
Resolution: 0.1°
Accuracy: less than ±0.3° typical, ±1.0° max
Control Section
The control unit for the EPOCH-II high-current section is PULSAR
(with the High-Current Interface Module), an EPOCH-I or EPOCH-
10. Thus, the excellent operating and control features of PULSAR
and the EPOCH-10 are used to control the EPOCH-II.
Note: When the EPOCH-II is in use, the current output of the
EPOCH-10 control unit is inoperative. All EPOCH-10s can control
an EPOCH-II high-current section. When the high-current section
of the EPOCH-II is not needed, the EPOCH-10 can be used
independently or slaved together with other EPOCH units.
Protection
The input line circuit is breaker-protected. The dc power supply is
overcurrent-protected. In addition, overvoltage protection is
provided on the input line circuit.
The power amplifiers are forced-air cooled and are protected by
thermal-overload sensors.
Audio and visual alarms on the PULSAR and EPOCH-10 control
units indicate whenever the current or potential outputs are
overloaded.
Temperature
Operating
32 to 122° F (0 to 50° C)
Reduced duty cycle above 113° F (45° C)
Storage
–13 to +158° F (–25° to +70° C)
Dimensions
7.6 H x 19.75 W x 21.6 D in.
(193 H x 502 W x 549 D mm)
Weight
115 lb (52.3 kg)
EPOCH-II
High-Current Output Unit
Item (Qty) Cat. No.
PULSAR - Refer to pages 17-18
EPOCH-II EPOCHII-STD
EPOCH-II without enclosures, fits standard, 19-in. [483-mm] rack EPOCHII-RK
Included Accessories
Carrying case 11437
Fuses, 1.0 A, 250 V (5) 4139
Ground lead (1) 11258
High-current leads
Black (1) 10708
Red (1) 11245
Power cord 11266
Interconnect cables
Control (1) 10574
Signal (1) 11307
Instruction manual (1) 10709
ORDERING INFORMATION
UK
Archcliffe Road Dover
CT17 9EN England
T +44 (0) 1304 502101
F +44 (0) 1304 207342
UNITED STATES
4271 Bronze Way Dallas
TX75237-1017 USA
T 800 723 2861 (USA only)
T +1 214 330 3203
F +1 214 337 3038
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, Toronto CANADA,
Mumbai INDIA, Trappes FRANCE,
Sydney AUSTRALIA, Madrid SPAIN
and the Kingdom of BAHRAIN.
Registered to ISO 9001:2000 Reg no. Q 09290
Registered to ISO 14001 Reg no. EMS 61597
EPOCH_II_DS_en_V10
www.megger.com
The word ‘Megger’ is a registered
trademark
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