I-Gard DSP-CA User manual

Ground Fault Protection
DSP OHMNI Accessory:
DSP-CA(S) Cable Adapter
Instruction Manual
7615 Kimbel Street,
Mississauga,
Ontario Canada L5S 1A8
Tel: [phone]
Fax: [phone]
Toll Free: 1-888-RESISTR 737-4787
www.i-gard.com
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C-415EM
INSTRUCTION MANUAL
DSP-CA(S) CABLE ADAPTER
April 2007
2
1. Introduction
1.1. The DIN –Rail mounted DSP Ground Fault Protection system from IPC Resistors is used exclusively with
High-Resistance Grounded (HRG) power systems. The DSP can be used on multi-source substations such
as double-ended main-tie-main board arrangements. In the case of a utility outage on one of the sources of
such a system, the main breaker on one side will open and the tie breaker will close (through key interlock
or other controls) so that power on the ‘dead’ side is supplied from the ‘live’ side to maintain service to both
sides of the board.
1.2. The DSP system includes priority allocation to each feeder breaker depending on its importance. On a
double-ended station there will be two DSP systems – one on each side of the board. Normally they will
operate independently of each other. However, when the tie breaker is closed the two DSP systems will not
prioritize breakers on the other side of the board and in the event of a fault involving both sides of the board,
then two breakers would trip.
1.3. To prioritize the combined system it is possible to join the two priority buses together when the tie breaker is
closed using an 8-conductor shielded cable. The cable can connected at either end through IPC cable
adapter modules types DSP-CA or DSP-CAS.
1.4. The DSP-CA and DSP-CAS are similar 70mm DIN rail mounted units that tie into the DSP system with
standard 20 position ribbon cable connectors (IPC Resistors RC-3) the 8-conductor cable then may be
connected to either an 8-position terminal block or plugged into a RJ-45 8-8 Modular Jack at the discretion
of the installer. The DSP-CA and DSP-CAS modules simply act as junction boxes to connect the priority bus
lines to the appropriate ribbon cable terminals.
1.5. The DSP-CAS includes an electronic switch to connect or disconnect the priority bus from the DSP bus.
This switch is controlled by a contact closure across the two input terminals (1 and 2). A yellow ON LED
indicates that the switch is activated.
1.6. The DSP-CA module is simply a junction box without switching. One of each module is required to interface
the cable to the DSP Modules.
Note: A DSP-CAS can be used instead of a DSP-CA if necessary, but the input terminals would have to be
permanently shorted.
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C-415EM
INSTRUCTION MANUAL
DSP-CA(S) CABLE ADAPTER
April 2007
3
2. Installation
DANGER
Hazard of Electrical Shock, Burn or Explosion
Qualified personnel must perform all installation, servicing and testing
referred to in this manual. All power should be disconnected prior to
removing covers or enclosures and where live conductors may
otherwise be exposed.
Failure to observe these precautions may result in death or severe personal injury.
2.1. The DSP-CA(S) modules may be connected to the DSP Feeder Modules DSP-DFM by the use of either of
the two ribbon cable connectors from either side as desired. See Figure 2.1 (a) and (b)
2.2. Terminal 13 should connect to terminal 13 on both sides of the board in a double-ended situation, terminal
14 to terminal 14 etc. for 7 conductors (terminals 13 to 19).
2.3. The connecting cable should be 22 AWG, shielded, with the shield grounded to terminal 20 at one end only
to avoid shield currents.
2.4. The two-conductor cable from the tie-breaker contacts need not be shielded and may be as small as
22AWG.
2.5. If it is desired, then RJ-45 Modular plugs can be used with a suitable 8-conductor, straight cable which
connects pin 1 to pin 1, pin 2 to pin 2 etc on the modular jacks. Pin 8 of this connector should be connected
to the shield at one end.
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C-415EM
INSTRUCTION MANUAL
DSP-CA(S) CABLE ADAPTER
April 2007
4
1314 15 16 17 18 19 20
DSP-CA
Trip Signal
Feeder Alarm
P
0
P
1
P
2
P
3
Gnd Gnd
Ribbon to DSP-
DFM
Figure 2.1 (a) DSP-CAS Connections Figure 2.1(b) DSP-CA Connections
12
13 14 15 16 17 18 19 20
ON
DSP-CAS
Trip Signal
Feeder Alarm
P
0
P
1
P
2
P
3
Gnd Gnd
Ribbon to DSP-
DFM
Alternate Ribbon
Connection
Input 1 Input 2
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C-415EM
INSTRUCTION MANUAL
DSP-CA(S) CABLE ADAPTER
April 2007
5
Figure 2.2 Modular Jack connections
On the modular jack the pin-out connections are in the same order as for the terminal block assignment. i.e.
Pin 1 signal is TRIP SIGNAL
Pin2 signal is FEEDER ALARM
Pin 3 signal is P0
Pin 4 signal is P1
Pin 5 signal is P2
Pin 6 signal is P3
Pin 7and Pin 8 is GND
Pin 7 or 8 can be used to connect the shield of a cable to ground at one end only .
The connection should be the same at both ends of the cable i.e. pin 1 of one plug should connect to pin 1 on the
other plug and pin 2 to pin 2, and so on.
3. Testing
3.1. A digital multimeter can be used to to verify that the connection is working. With the DSP energized,
connect a digital meter set to read ohms or continuity, between terminal 13 on the left side adapter (whether
it be DSP-CA or DSP-CAS does not matter) and terminal 13 on the right side adapter. There should be no
continuity (2 Megohms, or greater) when there is no short across terminals 1 and 2 of the DSP-CAS and
when shorted there should be low resistance between the two terminals (less than 100 ohms). Repeat for
the other terminals 14 to 18.
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C-415EM
INSTRUCTION MANUAL
DSP-CA(S) CABLE ADAPTER
April 2007
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4. Outline Dimensions
Figure 4.1 shows typical Dimensional details of the Polymeric enclosures used for the two modules.
DSP-CA and DSP-CAS
58.00mm
85.00mm
70mm
Figure 4.1 Dimensional Details DSP-CA(S)
5. Typical Installation Diagrams
5.1. Figures 5.1 and 5.2 illustrate the use of the DSP systems in double and triple ended substations Note the
diagrams are simplified and do not show the DDR2 resistors or sensors and Trip circuit wiring, for clarity.
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C-415EM
INSTRUCTION MANUAL
DSP-CA(S) CABLE ADAPTER
April 2007
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Figure 5.1 Typical Main-Tie-Main Substation with two DSP systems
.
DSP-CAS
Switch
DSP-CA
(No Switch)
N.O. Contact
Screw Terminals or
RJ-45 Jack
Shielded Cable 22 Gauge
x 8 conductor
Shield
Connected to
Ground at one
end of cable
only.
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C-415EM
INSTRUCTION MANUAL
DSP-CA(S) CABLE ADAPTER
April 2007
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DSP-CAS
Switch DSP-CA DSP-CAS Switch DSP-CA
AuxContact
DSP-CAS
Switch
AuxContact
Figure 5.2 Typical Main-Tie-Main-Tie-Main Substation with three DSP systems
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Mississauga ON e-mail: [email protected]
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