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IB02602004E
For more information visit: www.eaton.com
Instructional Literature
Effective: May 2008
Page
133
Instructions for the FP-6000 Protective Relay
To minimize problems with CT saturation during faults keep the
CT wiring as short as possible and use very heavy wire. The total
resistance of the connecting wire should not be much larger than
the secondary resistance of the CT itself. The FP-6000 presents
very low burden.
Every phase and ground CT circuit must have one and only one
grounding point. Figure 34 shows the common neutral
connection of the 3-phase CTs, and the ground fault CT,
connected at one point to a non-current-carrying ground. Do not
use a neutral or current-carrying conductor for this grounding –
the noise will disrupt FP-6000 measurements.
Residual connection of the phase CT secondaries to form a
ground current signal will not give sensitivity approaching that of
the flux-canceling ground CT.
6.3.2 VT Wiring TB2
Wiring of the VTs into the FP-6000 phase voltage input terminals
can be achieved several ways. Figures 34 & 35 gives a common
example of the VT Wye wiring. In Figures 36 & 37, a Delta
configuration is implemented using only two transformers,
saving cost, weight and size. The transformer polarity indicated
by polarity dots must be carefully considered when designing
the VT into the system. It should be noted that the secondary
side of the transformer center tap is tied to common, input VB (+)
terminal 214, and VG terminal 218.
It should be noted that an FP-6000 can accommodate a reverse
phase sequence providing that phase voltages and current are in
sync (see Section 5).
6.3.3 Output Contact Wiring TB1
See Section 3 Specifications for ratings of output contacts, and
check against controlled loads.
Figures 34 through 37 show typical connections of FP-6000
output relay contacts in control circuits. However, the outputs are
completely programmable, so there can be numerous choices in
selecting and using these outputs for tripping, alarming and
auxiliary control.
The installation design engineer should refer to Sections 5 and 9
to understand the available output functions and programming
options. It is recommended to record and confirm the settings,
and also design a consistent connection of the contacts of the
output relays to the control system.
6.3.4 Supply Wiring TB1
Refer to Figure 33 or 34. Connect terminals 101 and 102 to a
source of control power rated at either 100 –120 Vac or 48–125
Vdc. Nominal values other than these voltages are not
acceptable. However, the FP-6000 is capable of handling
depressions, dips, and limited sustained variations in the normal
course of service. See Section 3 - Specifications.
6.3.5 Contact Input Wiring TB2
The optically isolated contact inputs are “dry contact inputs.” The
actuating or wetting voltage is provided by the FP-6000. Each
input is activated by connecting it through an appropriate
contact to the provided voltage. The return, common connection,
or dc negative rail associated with the “wetting voltage” is
internal only and is not provided to the user (see Figure 35). The
wetting voltage and current requirements of the external
contacts should be reviewed for compatibility with the FP-6000’s
40 Vdc source voltage and 2mA current draw. The particular
contacts to be connected depend on the settings programmed in
the FP-6000. There is a complete list of functions which can be
assigned to each of these inputs.
The engineer designing the installation should study Sections 5
and 9 to understand and designate the use, if any, of the discrete
contact-sensing inputs assigned to each input.
The discrete input circuits (Cin1 – Cin8) are totally isolated from
the other circuits in the FP-6000. Supply or wetting voltages
(40 Vdc) are located on terminals [C in source 1] and [C in source
2] (TB 205/210) and return is through each input. Wetting current
is limited to ~2mA per input. There are no external connections
for common or return for these circuits.
6.3.6 Terminal Identification
This section offers a brief description of the terminals mounted
on the rear of the outer case. The terminal designators are TB1,
TB2, TB3, and CT connector TB4. Refer to Figures 30 and 31
FP-6000 Rear Terminal Designations.
Power Supply and Relay Contacts (TB1)
The power supply terminals are 101 and 102. There are five Form
A normally open relays each with their own independent
common, and 2 Form C normally open, normally closed relays
each with their own independent common. These relays can be
tested as well as reset when in the test mode as mentioned in
Section 11.2.5.2. Refer to Figure 30 FP-6000 Rear Connections and
Table 5 - Table of Specifications for relay terminal numbers and
relay electrical characteristics.
Cin1 – Cin8 (TB2)
Terminals 201–210 of terminal block TB2 are used in
programmable logic applications. Default settings are set at the
factory to provide standard operational functions. Cin1 – Cin8 are
used as contact inputs when the “Contact Input” option category
is selected. For more detailed information, refer to Section 9,
“Programmable Logic Application.”
Reserved (TB2)
Terminals 211 and 212 are reserved for future design efforts. Do
not connect circuits to these terminals.
VT Terminals (TB2)
Pins 213–218 are phase A, B, C, Auxiliary and ground voltage
inputs from the VT (voltage transformer) module. The VT module
is used to measure the line voltage and steps down the voltage
to a smaller potential. It also provides isolation to the FP-6000
and from the voltage bus. Figure 34 through Figure 37 show
Delta and Wye connected feeder protection, respectively.
Note:
Careful attention should be made to the phase wiring to avoid erro-
neous power and voltage indications as well as damage to the FP-6000.
CAUTION
TERMINAL TB218 VG IS INTERNALLY REFERENCED TO GROUND
THROUGH A CONTROLLED IMPEDANCE TO THE FP-6000 CHASSIS.
THE VOLTAGE TRANSFORMER SECONDARY RETURN MUST BE
PROTECTIVE EARTH GROUNDED AND TB218 CONNECTED TO THIS
RETURN. TB218 VG MUST NOT BE CONNECTED TO PHASE OR NEU-
TRAL CONNECTIONS.
CAUTION
BEWARE OF LARGE SHUNT CAPACITANCE ACROSS CONTACTS OR
IN SOLID-STATE RELAYS CONNECTED TO THE FP-6000 DISCRETE
INPUTS. CHARGING CURRENT THROUGH THE CAPACITOR COULD
CAUSE A FALSE INDICATION OF A CLOSED CONTACT. KEEP TOTAL
CAPACITANCE BELOW 0.05 MICROFARADS.