Atec Amp-EPOCH-II User Manual
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)
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