I.B. 17555C
Effective November 1999
Page B4
3.0
FUNCTIONAL DESCRIPTION
The Dual-Source Power Supply contains 1 ac voltage
transformer and 3 ac current transformers. The ac volt-
age transformer is used to supply nominal ac control
power to the unit. The current transformers are used to
power the unit from the line current. Normally, the unit will
operate from the ac auxiliary power. Since this voltage is
usually obtained from the system containing the circuit
that the relay is protecting, a fault on the protected line
could cause the ac voltage to drop below an acceptable
operating level. Below approximately 70 volts for DT3010
or 140 volts for DT3020, the DSPS switches over to cur-
rent powering. All three current transformer secondaries
are connected in series to supply this power. The DSPS
will supply enough power to operate the Digitrip 3000
overcurrent relay in the tripped state with currents greater
than 1.8 per unit rated secondary current, or 9A, in a sin-
gle-phase. The DSPS will operate with 3-phase currents
in a tripped state with currents greater than 1.2 per unit or
6A rated secondary current.
NOTE: There will be no effect to the DT3000 relay trip
time accuracy when the Dual-Source Power Supply
switches from normal ac voltage to fault-current
power.
4.0
INSTALLATION
NOTE: The following material replaces Paragraph 5-2
on page 34.
4.1
PANEL PREPARATION
The dimensions for the cutout, along with the location of
the 10 mounting holes, are shown in
Figure 5-1
. Before
actually cutting the panel, be sure that the required 3-
dimensional clearances for the relay chassis allow
mounting in the desired location. The Digitrip 3000 with
DSPS dimensions are shown in Figure B-2.
4.2
MOUNTING THE DIGITRIP 3000 WITH DUAL-
SOURCE POWER SUPPLY
Once the cutout has been prepared in the panel or
switchgear enclosure, according to
Figure 5-1
, the Dig-
itrip 3010/3020 can be mounted.
CAUTION
SUPPORT THE PROTECTIVE RELAY FROM THE
FRONT SIDE WHEN MOUNTING. WITHOUT SUCH
SUPPORT, THE PROTECTIVE RELAY COULD FALL
AND CAUSE DAMAGE OR INJURY COULD RESULT.
Do not use a tap on the face of the relay. Use all 10 self-
tapping screws included with the relay to mount the unit
on the panel.
Содержание Cutler-Hammer Digitrip 3000
Страница 18: ...I B 17555C Effective November 1999 Page 12 Fig 2 1 Typical Communications Wiring Diagram...
Страница 27: ...I B 17555C Effective November 1999 Page 21 Fig 3 1 Digitrip 3000 Typical Wiring Diagram...
Страница 36: ...I B 17555C Effective November 1999 Page 30 Fig 3 11 Local Programming Sequence Flow Chart...
Страница 37: ...I B 17555C Effective November 1999 Page 31...
Страница 48: ...I B 17555C Effective November 1999 Page 42 Fig 7 1 Inverse Time Overcurrent Phase I4T Curves SC 5390 92B...
Страница 49: ...I B 17555C Effective November 1999 Page 43 Fig 7 2 Inverse Time Overcurrent Phase I2T Curves SC 5391 92B...
Страница 50: ...I B 17555C Effective November 1999 Page 44 Fig 7 3 Inverse Time Overcurrent Phase IT Curves SC 5392 92B...
Страница 51: ...I B 17555C Effective November 1999 Page 45 Fig 7 4 Inverse Time Overcurrent Phase Flat Curves SC 5393 92B...
Страница 52: ...I B 17555C Effective November 1999 Page 46 Fig 7 5 Short Delay Phase Curves SC 5394 92B...
Страница 53: ...I B 17555C Effective November 1999 Page 47 Fig 7 6 Inverse Time Overcurrent Short Delay Curves SC 5395 92B...
Страница 54: ...I B 17555C Effective November 1999 Page 48 Fig 7 7 Instantaneous Curves SC 5396 92B...
Страница 55: ...I B 17555C Effective November 1999 Page 49 Fig 7 8 Inverse Time Overcurrent Ground I4T Curves SC 5399 92B...
Страница 56: ...I B 17555C Effective November 1999 Page 50 Fig 7 9 Inverse Time Overcurrent Ground I2T Curves SC 5400 92B...
Страница 57: ...I B 17555C Effective November 1999 Page 51 Fig 7 10 Inverse Time Overcurrent Ground IT Curves SC 5401 92B...
Страница 58: ...I B 17555C Effective November 1999 Page 52 Fig 7 11 Inverse Time Overcurrent Ground Flat Curves SC 5402 92B...
Страница 59: ...I B 17555C Effective November 1999 Page 53 Fig 7 12 Short Delay Ground Curves SC 5403 92B...
Страница 60: ...I B 17555C Effective November 1999 Page 54 Fig 7 13 ANSI Moderately Inverse Curves SC 6685 96...
Страница 61: ...I B 17555C Effective November 1999 Page 55 Fig 7 14 ANSI Very Inverse Curves SC 6686 96...
Страница 62: ...I B 17555C Effective November 1999 Page 56 Fig 7 15 ANSI Extremely Inverse Curves SC 6687 96...
Страница 63: ...I B 17555C Effective November 1999 Page 57 Fig 7 16 IEC A Moderately Inverse Curves SC 6688 96...
Страница 64: ...I B 17555C Effective November 1999 Page 58 Fig 7 17 IEC B Very Inverse Curves SC 6689 96...
Страница 65: ...I B 17555C Effective November 1999 Page 59 Fig 7 18 IEC C Extremely Inverse Curves SC 6690 96...
Страница 66: ...I B 17555C Effective November 1999 Page 60 Fig 7 19 IEC D Flat Curves SC 6691 96...
Страница 68: ...I B 17555C Effective November 1999 Page 62...
Страница 73: ...I B 17555C Effective November 1999 Page A5 Fig A 7 DT3001 Typical Wiring Diagram...
Страница 76: ...I B 17555C Effective November 1999 Page A8...
Страница 81: ...I B 17555C Effective November 1999 Page B5 Fig B 2 Digitrip 3010 3020 Dimensions Inches...
Страница 83: ...I B 17555C Effective November 1999 Page B7 Fig B 3 Digitrip 3010 3020 Typical Wiring Diagram...
Страница 89: ...I B 17555C Effective November 1999 Page B13...
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