I.B. 17555C
Effective November 1999
Page 3
Thermal curves, plus ANSI and IEC inverse time overcur-
rent curves provide close coordination with both down-
stream and upstream protective devices. One Digitrip
3000 Protective Relay replaces the normal complement
of three or four conventional electro-mechanical overcur-
rent relays, an ammeter, a demand ammeter, an amme-
ter switch, and, in some situations, a lockout relay switch
(device 86). All Digitrip 3000 Protective Relays include a
built-in INCOM communication capability compatible with
the Cutler-Hammer PowerNet and IMPACC Systems.
1-3
FUNCTIONS/FEATURES/OPTIONS
The primary function of the Digitrip 3000 Protective Relay
is overcurrent protection. This is achieved by analyzing
the secondary current signals received from the switch-
gear current transformers. When predetermined current
levels and time delay settings are exceeded, the closing
of trip contact(s) is used to initiate breaker tripping.
The Digitrip 3000 Protective Relay operates from the sec-
ondary output of standard switchgear current transform-
ers rated at = 5 amperes. It is operator configured to fit
specific distribution system requirements. The current
transformer ratio information is programmed into Digitrip
3000 by setting pushbuttons located on the faceplate of
the relay. The phase and ground CT ratios can be inde-
pendently programmed over a range of 5:5 to 5000:5.
Refer to Table 2.4 for all available CT ratio settings.
Protective functions are also configured by using the
pushbuttons on the faceplate of the relay. These protec-
tive functions can be programmed with the circuit breaker
in the open or closed position. DIP Switch S2, located on
the rear of the relay, is used to control closed breaker set-
ting ability (Figure 1-3). Refer to Paragraph 2-2.2 and
Table 5.1 for additional information. Inverse time over-
current protection for the phase element cannot be dis-
abled. This insures that all phase protection cannot be
disabled. The relay also automatically exits the program
mode, if there is no programming activity for 2-1/2 min-
utes. Programming and test mode security is provided by
a sealable, hinged access cover on the front of the relay.
Direct reading displays indicate the value currently being
considered, while multi-colored LEDs indicate opera-
tional conditions and specific functions (Figure 1-1).
In addition to performing a continuous self-testing of
internal circuitry as a part of normal operation, all Digitrip
3000 Protective Relays include a front accessible, inte-
gral field testing capability. In the integral test mode, a
test current simulates an overload or short circuit condi-
tion, to check that all tripping features are functioning
properly. The test function is user selectable to trip or not
trip the breaker. Refer to Paragraph 2-1.5 for additional
information.
Fig. 1-2
Digitrip 3030 Protective Relay (Rear and Side Views)
Summary of Contents for Cutler-Hammer Digitrip 3000
Page 18: ...I B 17555C Effective November 1999 Page 12 Fig 2 1 Typical Communications Wiring Diagram...
Page 27: ...I B 17555C Effective November 1999 Page 21 Fig 3 1 Digitrip 3000 Typical Wiring Diagram...
Page 36: ...I B 17555C Effective November 1999 Page 30 Fig 3 11 Local Programming Sequence Flow Chart...
Page 37: ...I B 17555C Effective November 1999 Page 31...
Page 52: ...I B 17555C Effective November 1999 Page 46 Fig 7 5 Short Delay Phase Curves SC 5394 92B...
Page 54: ...I B 17555C Effective November 1999 Page 48 Fig 7 7 Instantaneous Curves SC 5396 92B...
Page 59: ...I B 17555C Effective November 1999 Page 53 Fig 7 12 Short Delay Ground Curves SC 5403 92B...
Page 60: ...I B 17555C Effective November 1999 Page 54 Fig 7 13 ANSI Moderately Inverse Curves SC 6685 96...
Page 61: ...I B 17555C Effective November 1999 Page 55 Fig 7 14 ANSI Very Inverse Curves SC 6686 96...
Page 62: ...I B 17555C Effective November 1999 Page 56 Fig 7 15 ANSI Extremely Inverse Curves SC 6687 96...
Page 63: ...I B 17555C Effective November 1999 Page 57 Fig 7 16 IEC A Moderately Inverse Curves SC 6688 96...
Page 64: ...I B 17555C Effective November 1999 Page 58 Fig 7 17 IEC B Very Inverse Curves SC 6689 96...
Page 65: ...I B 17555C Effective November 1999 Page 59 Fig 7 18 IEC C Extremely Inverse Curves SC 6690 96...
Page 66: ...I B 17555C Effective November 1999 Page 60 Fig 7 19 IEC D Flat Curves SC 6691 96...
Page 68: ...I B 17555C Effective November 1999 Page 62...
Page 73: ...I B 17555C Effective November 1999 Page A5 Fig A 7 DT3001 Typical Wiring Diagram...
Page 76: ...I B 17555C Effective November 1999 Page A8...
Page 81: ...I B 17555C Effective November 1999 Page B5 Fig B 2 Digitrip 3010 3020 Dimensions Inches...
Page 83: ...I B 17555C Effective November 1999 Page B7 Fig B 3 Digitrip 3010 3020 Typical Wiring Diagram...
Page 89: ...I B 17555C Effective November 1999 Page B13...
Page 90: ...I B 17555C Effective November 1999 Page B14...