S&C Vista Owner's manual

Instruction Sheet 681-515
Introduction
Qualified Persons ..............................2
Read this Instruction Sheet.......................2
Retain this Instruction Sheet......................2
Warranty .....................................2
Safety Information
Understanding Safety-Alert Messages ..............3
Following Safety Instructions .....................3
Replacement Instructions and Labels...............3
Location of Safety Labels ........................4
Description
General ......................................5
Programming .................................5
Power and Sensing.............................6
Time-Current Characteristics .....................6
Settings ......................................6
Event Recording ...............................7
Self Testing ...................................7
Single-Pole or Three-Pole Tripping .................7
Setting Up for Programming
in the Field
Connecting a Personal Computer..................8
Setting the Communication Parameters .............8
Setting Up for Programming
in the Shop
Electronics and Burden Board ....................9
Removing the Electronics Module .................9
Connecting a Personal Computer.................11
Setting the Communication Parameters ............11
Reinstalling the Electronics Module ...............12
Programming
Factory-Default Settings ........................14
Fault Interrupters 1 and 2 .......................14
Passwords. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Main Menu ..................................14
View Menu 1 or 2 .............................15
Configure Menu 1 or 2 .........................17
Change User Password ........................19
Group Configure Menu .........................19
Test Trip Menu................................21
Self-Test Report
Viewing of Self-Test Report .....................22
Response to Self-Test Failure ....................22
Self-Test Failures and Warnings ..................23
Specifications
Port Power ..................................24
CT Power ...................................24
Steady State Accuracy .........................24
Time-Overcurrent Pickup Accuracy................24
Time-Overcurrent Response.....................24
Instantaneous Pickup Accuracy ..................24
Instantaneous Response .......................24
Definite-Time Response ........................24
Appendix A
External Connections..........................25
Appendix B
Communication Parameters .....................29
Appendix C
Using Terminal Emulator Programs................30
HyperTerminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
AcSELerator®QuickSet 5030™ ..................31
Appendix D
Coordination .................................32
Appendix E
Overcurrent Control Settings.....................37
Programming S&C Overcurrent Control
Section Page Section Page
Table of Contents
S&C Vista®Underground Distribution Switchgear
Undercover™, Vault-Mounted, and Pad-Mounted Styles
© S&C Electric Company 2000-2015, all rights reserved
June 1, 2015

Qualified Persons WARNING
The equipment covered by this publication must be operated and maintained by qualified
persons who understand any hazards involved and are thoroughly trained in the operation
and maintenance of electronic control devices which are used in conjunction with power dis-
tribution equipment. These instructions are intended only for such qualified persons. They
are not intended to be a substitute for adequate training and experience in safety proce-
dures for this type of equipment.
Read this
Instruction Sheet
Thoroughly and carefully read this instruction sheet before programming, operating,
or maintaining your S&C Overcurrent Control. Familiarize yourself with the safety
information on page 3. The latest version of this instruction sheet is available online in
PDF format at sandc.com/Support/Product-Literature.asp
Retain this
Instruction Sheet
This instruction sheet is a permanent part of your S&C Vista Underground Distribu-
tion Switchgear. Designate a location where you can easily retrieve and refer to this
publication.
Warranty The warranty and/or obligations described in S&C’s standard conditions of sale, as
set forth in Price Sheet 150, plus any special warranty provisions, as set forth in the
applicable product-line specication bulletin, are exclusive. The remedies provided in the
former for breach of these warranties shall constitute immediate purchaser’s or end user’s
exclusive remedy and a fulllment of all seller’s liability. In no event shall seller’s liability
to immediate purchaser or end user exceed the price of the specic product which gives
rise to immediate purchaser’s or end user’s claim. All other warranties whether express
or implied or arising by operation of law, course of dealing, usage of trade or otherwise,
are excluded. The only warranties are those stated in Price Sheet 150, and THERE ARE
NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE. ANY EXPRESS WARRANTY OR OTHER OBLIGATION
PROVIDED IN PRICE SHEET 150 IS GRANTED ONLY TO THE IMMEDIATE PURCHASER
AND END USER, AS DEFINED THEREIN. OTHER THAN AN END USER, NO REMOTE
PURCHASER MAY RELY ON ANY AFFIRMATION OF FACT OR PROMISE THAT
RELATES TO THE GOODS DESCRIBED HEREIN, ANY DESCRIPTION THAT RELATES
TO THE GOODS, OR ANY REMEDIAL PROMISE INCLUDED IN PRICE SHEET 150.
Introduction
2 S&C Instruction Sheet 681-515

Understanding
Safety-Alert
Messages
There are several types of safety-alert messages which may appear throughout this
instruction sheet as well as on labels attached to the S&C Overcurrent Control. Famil-
iarize yourself with these types of messages and the importance of the various signal
words, as explained below.
DANGER
“DANGER” identifies the most serious and immediate hazards which will likely
result in serious personal injury or death if instructions, including recommended pre-
cautions, are not followed.
WARNING
“WARNING” identifies hazards or unsafe practices which can result in serious per-
sonal injury or death if instructions, including recommended precautions, are
not followed.
CAUTION
“CAUTION” identifies hazards or unsafe practices which can result in minor
personal injury or product or property damage if instructions, including recommended
precautions, are not followed.
NOTICE
“NOTICE” identifies important procedures or requirements that, if not followed, can result in
product or property damage if instructions are not followed.
Following Safety
Instructions
If you do not understand any portion of this instruction sheet and need assistance,
contact your nearest S&C Sales Ofce or S&C Authorized Distributor. Their tele-
phone numbers are listed on S&C’s website sandc.com Or call S&C Headquarters
at [phone]; in Canada, call S&C Electric Canada Ltd. at [phone].
NOTICE
Thoroughly and carefully read this
instruction sheet before programming
your S&C Overcurrent Control.
Replacement
Instructions
and Labels
If you need additional copies of this instruction sheet, contact your nearest S&C Sales
Ofce, S&C Headquarters, or S&C Electric Canada Ltd.
It is important that any missing, damaged, or faded labels on the equipment be
replaced immediately. Replacement labels are available by contacting your nearest S&C
Sales Office, S&C Headquarters, or S&C Electric Canada Ltd.
Safety Information
S&C Instruction Sheet 681-515 3

Location of Safety Labels
Enclosure for overcurrent control with cover removed to show electronics module.
Electronics module
WARNING
Hazardous voltage inside can shock, burn,
or cause death.
Safety Information
DANGER
Never disconnect current transformer
secondary circuits without de-energizing
the switchgear. Hazardous voltage will
shock, burn, or cause death.
Burden-board module
Electronics module removed to show burden-board module.
4 S&C Instruction Sheet 681-515

Enclosure is mounted on switchgear in
operation compartment (Pad-Mounted and
Dry-Vault-Mounted Style shown here—a
stainless-steel enclosure is provided for
UnderCover and Wet-Vault-Mounted Style
Vista)
Adapter cable connects overcurrent
control to a personal computer
Personal computer is used to input
settings and interrogate event recorder
General The following instructions are for eld and shop programming of the S&C Overcurrent
Control. This microprocessor-based control is designed for use on S&C Vista Under-
ground Distribution Switchgear to provide fault detection and operation of the resettable,
vacuum fault interrupters. Each overcurrent control operates up to six single-pole fault
interrupters or two three-pole fault interrupters. The control is housed in an enclosure
which is mounted on the operation side of the switchgear. For UnderCover and Wet-Vault-
Mounted Style Vista units, the enclosure is fully submersible. The electronics module is
removable for programming in the shop.
Programming A personal computer furnished by the user is to be used to input settings, review set-
tings, and interrogate the event recorder. The software for programming the overcurrent
control is contained within the control. Two data ports are provided—one on the
enclosure for programming in the eld, and another on the electronics module for
programming in the shop. Adapter cables are available from S&C (see Instruction Sheet
681-515A) to connect the computer to the control.
An external power source is required for programming and interrogating the control.
A source of dc power is available from the mouse or USB port on the personal computer.
The adapter cables contain connectors for data and power to utilize the power available
from the computer.
Description
S&C Instruction Sheet 681-515 5

Power and Sensing Current transformers are provided inside the switchgear tank for each set of three single-
pole fault interrupters or each three-pole fault interrupter. These current transformers
provide primary current sensing ranging from 50 to 12,500 amperes (100 to 25,000 amperes
for 900-ampere and 1200-ampere models). Vista UDS rated above 12.5 kA short circuit
will respond to fault currents above 12.5 kA, but the event log will only record that a fault
above 12.5 kA has occurred (or 25 kA for 900-ampere and 1200-ampere models). The
overcurrent control is capable of sensing and responding to both phase overcurrents and
ground overcurrents.
The power derived from the current transformers is used to operate the control and
to charge the trip capacitors which discharge into magnetic latching solenoids to trip the
fault interrupters during a fault. No external power is required for operation of the control
in the field.
Time-Current
Characteristics
The overcurrent control features time-current characteristic (TCC) curves consisting
of phase-overcurrent curves and ground-overcurrent curves. The families of curves are
included as follows:
• S&C Standard Speed curves (for use in place of conventional “E” rated power fuses.
• S&C “K” Speed curves (for use in place of conventional “K” rated power fuses).
• Tap Fault Interrupter curves.
• Main Fault Interrupter curves.
• ANSI U.S. and IEC curves per IEEE Standard C37.112-1996 U1, U2, U3, U4, U5, C1, C2,
C3, C4, and C5.
The tap and main fault-interrupter TCC curves can be customized into hundreds
of different curves using a variety of instantaneous-pickup settings (discrete choices
from 0.2 kA through 6 kA), and definite-time delay settings (discrete choices from
32 ms through 128 ms). For even more specialized shapes, an instantaneous-pickup
setting can be combined with a definite-time delay setting. The minimum total
clearing time—from initiation of the fault to total clearing—is 40 milliseconds.▲
Settings
(See Appendix E for a
complete list of settings)
The overcurrent control has a phase-overcurrent pickup setting and an independent
ground-overcurrent pickup setting for each set of three single-pole fault interrupters or
each three-pole fault interrupter.
The input parameters for both the phase- and ground-overcurrent curves include
minimum pickup levels, instantaneous-pickup levels, and definite-time delays.
Phase-overcurrent pickup settings and ground-overcurrent pickup settings are made
independently. If desired, the ground-overcurrent curve and the instantaneous-
pickup and definite-time-delay attributes can be disabled. When E-speed or K-speed
curves are selected, the ground-overcurrent pickup setting is disabled as are the
instantaneous-pickup and definite-time-delay attributes. An example of how to select set-
tings for the overcurrent control is shown in Appendix D.
A choice of 50- or 60-hertz operation are also offered. For single-pole fault interrupters,
a choice of single-pole or three-pole trip is also offered (single-pole tripping is not possible
with three-pole fault interrupters).
▲The definite-time delay setting will override the instantaneous setting when the definite-time delay setting is activated before the instantaneous
setting.
Description
6 S&C Instruction Sheet 681-515

Event Recording The overcurrent control features an internal event recorder that captures the last
twelve fault operations for each fault interrupter. The event log indicates which poles
have experienced a fault, the magnitude of the fault, and whether or not a ground
overcurrent was involved. This information can be accessed via a personal computer
connected to the data port of the control.
Self Testing Whenever the overcurrent control is powered up—and then periodically thereaf-
ter—it automatically goes through a self-test procedure to test vital subsystems and
ensure proper operation. The control checks the trip capacitors, power-supply volt-
age, RAM, EEPROM, integrity of the data, and voltage control. It then ags whatever
fails the self-test.
Single-Pole or
Three-Pole Tripping
Three-pole fault interrupters are factory-programmed for three-pole tripping. This
setting should not be changed since single-pole tripping is not possible with three-
pole fault interrupters. However, when used with single-pole fault interrupters, the
overcurrent control can be programmed for either single-pole or three-pole tripping
of the fault interrupters. Single-pole tripping operation is when the control trips
only those fault interrupters on the phases that have experienced a fault. When set
for single-pole tripping operation, the control will not trip the fault interrupters in
response to a ground fault, but will respond to a phase overcurrent—whether or not
it involves ground.
Three-pole tripping operation is when the control trips all three fault interrupters
regardless of which phase has experienced a fault. For three-pole tripping operation,
a ground-fault setting is available and the control will operate the fault interrupters
in response to a ground overcurrent.
Description
S&C Instruction Sheet 681-515 7

Connecting a Personal Computer
A data port for communications is provided at the top of
the enclosure that houses the overcurrent control. This
data port, which is connected to the electronics module
inside the enclosure, cannot draw power from the control
and must be powered from an external source while in
use. When the data port is in use, the power-connection
points (Pins 1 and 4) power the control. The allowable
voltage range is 4 – 5 Vdc, and the power consumption is
1.8 W nominal, 2.2 W maximum.
Adapter cables are available from S&C (see Instruction
Sheet 681-515A) for connecting the control to a user-furnished
personal computer in the field. These cables provide for both
communications and power.
For Microsoft Windows users, no special software is
required to communicate with the control. The user interface
is menu driven within the control. Use the HyperTerminal
program provided with Microsoft Windows or other terminal
emulator program to set or interrogate the control.
Microsoft Windows Vista™, Windows®7, and Windows®8
users will have to install a terminal emulator program. See
Appendix C for further instructions.
Setting the Communication Parameters
Set the communication parameters shown in Appendix B.
Refer to Appendix C for additional instructions regarding
terminal emulation programs.
Adapter cable—connect cable to personal
computer (USB Style cable not shown)
Overcurrent control—(Pad-Mounted and
Dry-Vault-Mounted Style enclosure shown)
Adapter cable—connect cable to
communications data port on enclosure
Data port
Setting Up for Programming in the Field
8 S&C Instruction Sheet 681-515

Electronics and
Burden Board DANGER
Never disconnect CT secondary circuits without de-energizing the switchgear. Hazardous
voltage will shock, burn, or cause death.
CAUTION
When the electronics module is removed from its enclosure, the associated fault interrupt-
ers will not provide fault protection
The overcurrent control consists of an electronics module and a burden-board module
(burden board and base plate). Two current transformers (CTs) are provided for each
fault-interrupter pole; one supplies measurement current for the control and the other
supplies power for the control. The burden board recties the power and also transforms
the measurement current from the CT secondaries into voltage. It then passes rectied
power and current signals to the electronics module. The burden board provides the
burden for the CTs so that the electronics module can be removed and replaced while
the Vista switchgear is energized. A grounded shield protects the user from contact with
the CT secondaries should the secondaries become disconnected from the burden board.
Removing the
Electronics Module
1. Loosen the captive screws or bolts
that secure the cover of the control’s
enclosure in place and remove the
cover.
Four captive screws
secure cover to Pad-Mounted or
Dry-Vault-Mounted Style enclosures;
22 bolts secure cover to submersible
enclosures
CAUTION
ALWAYS disconnect the trip connectors from the electronics module before removing the
module from the base plate. Failure to follow this precaution may result in the unex-
pected operation of a fault interrupter.
Trip connectors—loosen both trip connectors and remove
them from electronics module
Electronics module
2. Disconnect the two trip connectors from the front of the electronics module.
Setting Up for Programming in the Shop
S&C Instruction Sheet 681-515 9

3. Loosen the two captive screws that secure the electronics module to the base
plate.
Captive screws secure electronics
module to base plate. Loosen the two screws
to prepare for removal of electronics module
4. Grasp the electronics module by the handle and lift it upward slightly away from
the base plate. This raises the stand-off attached to the inside of the cover of the
electronics module, allowing the CT shorting clip to make its connection to the
power CT secondaries and short circuit the secondaries. After the CT secondar-
ies are short circuited, the connection between the electronics module and the
burden-board module breaks.
Blind-mate
connector
on burden
board
Stand off
Shorting
clip
Burden-board module
Blind-mate
connector on
main board
Electronics module
5. Slide the electronics module a short distance away from the rear wall of the base
plate, lift the module up, and remove it from the base plate.
Electronics module—remove electronics module
from enclosure by sliding the module
forward slightly and lifting it upward
Setting Up for Programming in the Shop
10 S&C Instruction Sheet 681-515