S&C BankGuard PLUS User manual

1011-540 5-17-04
BankGuard PLUS™
Control
Operation Instructions
S&C Electric Company
6601 North Ridge Blvd.
Chicago, Illinois 60626 USA

BankGuard PLUS S&C Electric Company
Control Proprietary Information
2 Operation 1011-540 5-17-04
Instruction Sheets Include:
Product Description 1011-500 explains important product features.
Installation 1011-510 describes how to install and connect the
BankGuard PLUS Control.
Setup 1011-530 describes how to use the Setup software to
configure the BankGuard PLUS Control, check the
present settings, and view real-time data.
Operations 1011-540 describes how to view historical data, how
to generate reports, and how to update the Control
software. This instruction sheet also explains how
the BankGuard PLUS Control works during normal
operation.
Troubleshooting 1011-550 describes how to diagnose and correct
various BankGuard PLUS Control problems.
Latest Release of This Document
The latest release of this instruction sheet is available online at www.sandc.com.
Select: Support/ Product Support Documents. Documents are posted in PDF format.
Safety Information
WARNING
The equipment covered by this publication must be installed, operated, and maintained
by qualified persons who are knowledgeable in the installation, operation, and
maintenance of overhead electric power distribution equipment along with the
associated hazards. A qualified person is one who is trained and competent in:
zThe skills and techniques necessary to distinguish exposed live parts from non-live
parts of electrical equipment.
zThe skills and techniques necessary to determine the proper approach distances
corresponding to the voltages to which the qualified person will be exposed.
zThe proper use of the special precautionary techniques, personal protective
equipment, insulating and shielding materials, and insulated tools for working on or
near exposed energized parts of electrical 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 procedures for this type
of equipment.

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Read this Instruction Sheet
Thoroughly and carefully read this instruction sheet before programming, operating, or
maintaining your S&C BankGuard PLUS Control. Familiarize yourself with “SAFETY
INFORMATION” on pages 3 through 5.
Retain this Instruction Sheet
This instruction sheet is a permanent part of your BankGuard PLUS Control. Designate a
location where you can easily retrieve and refer to this publication.
Warranty
The standard warranty contained in S&C’s standard conditions of sale, as set forth in Price
Sheet 150, is applicable to the BankGuard PLUS Control.
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 BankGuard PLUS Control.
Familiarize yourself with these types of messages and the importance of the various signal
words, as explained below.
DANGER
WARNING
CAUTION
“DANGER” identifies the most serious and immediate hazards which will likely result
in serious personal injury or death if instructions, including recommended precautions,
are not followed.
“WARNING” identifies hazards or unsafe practices which can result in serious personal
injury or death if instructions, including recommended precautions, are not followed.
“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.

BankGuard PLUS S&C Electric Company
Control Proprietary Information
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NOTICE
Following Safety Instructions
If you do not understand any portion of this instruction sheet and need assistance, contact
your nearest S&C Sales Office or call S&C Headquarters at [phone], Monday
through Friday between 8:30 AM and 5:00 PM Central Standard Time. (In Canada, call
S&C Electric Canada Ltd. at [phone].)
NOTICE
Replacement Instructions and Labels
If you need additional copies of this instruction sheet, contact your nearest S&C Sales
Office, 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.
Instruction Sheet Contents
Introduction ..................................................................................................................... 5
Applicable Software........................................................................................................ 5
Control Device Hardware and Software ......................................................................... 6
IntelliLINK Software ................................................................................................. 7
SCADA Communications Equipment ............................................................................ 8
Control Device Operations.............................................................................................. 9
Overvoltage Protection for Capacitor Banks .................................................................. 9
Protection for Reactors.................................................................................................... 9
Automatic Control Features .......................................................................................... 10
Ungrounded and Grounded Wye Shunt Capacitor Banks............................................. 11
Ungrounded Wye Shunt Reactors ................................................................................. 15
Signal Processing .......................................................................................................... 17
Generating Reports........................................................................................................ 21
Saving and Loading a Setup Configuration .................................................................. 22
Viewing IntelliLINK Software Without Data ............................................................... 23
Using Snapshots (VM Files) ......................................................................................... 24
Updating the Control Device Software ......................................................................... 26
“NOTICE” identifies important procedures or requirements that, if not followed, can
result in product or property damage if instructions are not followed.
Thoroughly and carefully read this instruction sheet before programming and operating
your S&C BankGuard PLUS Control.

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S&C Electric Company BankGuard PLUS
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Introduction
This instruction sheet provides information related to daily operation of the BankGuard
PLUS Automatic Control Device, including:
zControl device hardware and software components (page 6)
zControl device features (page 9)
zGenerating reports (page 21)
zSaving and loading setup configurations (page 22)
zViewing the IntelliLINK software without data (page 23)
zCreating and using snapshots (VM files) (page 24)
zUpdating the Control Device software (page 26)
Applicable Software
This instruction sheet was prepared for use with software UPPD105S or later releases.
You can find the release date on the Setup disk label. For questions regarding the
applicability of information in this instruction sheet to future software releases, please
contact S&C.

BankGuard PLUS S&C Electric Company
Control Proprietary Information
6 Operation 1011-540 5-17-04
Control Device Hardware & Software
This section describes various control device components. The following section,
Overview of Control Device Operations, explains how these components work together to
monitor and manage capacitor bank/reactor operation.
The Control Device Hardware Components and Faceplate
Figure 1 shows hardware components of the control device that you may need to access
during regular operation and troubleshooting.
The BankGuard PLUS faceplate includes LEDs and buttons which allow you to monitor
the capacitor bank/reactor and the control device. It also includes a liquid crystal display
and buttons for scrolling and selecting data.
Figure 1
Location of BankGuard Plus Control Device Components
Local communications port – The control device has a port on its faceplate for
local communications. If your control device includes communications equipment,
it will usually be connected to the SCADA COMM PORT on the back.
Terminal strips – Every BankGuard PLUS control device includes two numbered
terminal strips for connecting to the external control wiring. Their configuration is
shown in the Installation Instruction Sheet 1011-510.
Terminal Strips
(on back)
Power Supply
ON/OFF Button
Faceplate LCD
and Keypad
Faceplate Local
Communications
Port

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Control Device Software
S&C controls and devices are entirely software-driven. Each control device is shipped
with Control Device software and IntelliLINK®software.
Control Device Software
The Control Device software is preloaded into the control device in the factory. This
software manages the minute-by-minute functioning of the control device. It continually
monitors:
zvoltage on the feeder
zincoming SCADA commands
zthe state of the faceplate LEDs and buttons
zthe internal control device clock/calendar
zthe software setpoint values
zvarious other setpoints and data values as needed
Based on this information, the Control Device software decides how to respond to a
change in voltage, a command from the faceplate or SCADA master station, and other
conditions.
The Control Device software and the setpoint values are all stored in non-volatile control
device memory. This memory survives power interruptions. The memory chip is a battery-
backed RAM with 20 year expected life in the powered state (10 year shelf life without
power).
IntelliLINK Software
The IntelliLINK software is supplied on the Setup disk and runs on IBM/PC-compatible
computers. This software allows you to communicate with the Control Device software
while you are at the control device site. Using the IntelliLINK software, you can:
zEnter installation-dependent operating parameters (setpoints), such as a network
address, a voltage lockout level, etc.
zMonitor real-time data, such as the present line-to-ground voltage.
zTransfer all configuration, operating, and historical data from the control device to
a “report” file on your computer.
zDownload new Control Device software into the control device.
zTroubleshoot assorted types of control device installation problems.

BankGuard PLUS S&C Electric Company
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SCADA Communications Equipment
Most types of communications equipment can be mounted near the control device. This
eliminates clutter and provides a higher level of reliability for the overall installation.
DNP 3.0 is the standard protocol for the BAnkGuard PLUS control device; other protocol
options are also available.
For more details, see the appropriate Communications Points List, or contact S&C.

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S&C Electric Company BankGuard PLUS
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Overview of Control Device Operations
This section explains how the control device components work together to control the
capacitor bank or reactor.
Overvoltage Protection for Capacitor Banks
Medium to large wye-connected shunt capacitor banks commonly use twofold protection
against short circuits:
zIndividual capacitor units are protected by fuse links that clear internal faults,
reducing the probability of case ruptures.
zThe system is protected against major faults by the bank protective device, such as
power fuses or an S&C Circuit-Switcher.
But when a fuse link operates to isolate a failed capacitor unit, the voltage across
remaining units in the same series group increases. This increased voltage can overstress
and shorten the life of the other good capacitor units in the group. As subsequent units fail,
their isolation leads to still further voltage increases on remaining units. The result is an
accelerating cascade of overvoltages that destroys good capacitor units.
This phenomenon is addressed in IEEE Standard 18-1992, “IEEE Standard for Shunt
Power Capacitors.” The standard specifies a curve (Figure 2) which indicates the
permissible capacitor unit operating time at varying per-unit multiples of the capacitor
nameplate voltage rating. This curve applies for up to 300 applications of power-
frequency overvoltages of the magnitude and duration shown. (The standard further
requires that capacitors be capable of continuous operation to at least 110% of the rated
voltage, including harmonics. Most capacitor manufacturers publish similar data, which
may permit higher working voltages.) When the voltage applied to the surviving capacitor
units exceeds the manufacturer’s maximum recommended working voltage (or in the
absence of a recommendation, the IEEE standard), the entire bank should be removed
from service.
Thus, large-sized capacitor banks need a third form of protection: a control device that is
sensitive enough to detect the isolation of the first failed unit in a capacitor bank, but
sophisticated enough to disregard system and inherent bank imbalances, spurious
transients, and harmonics. Also, the ability to alarm upon isolation of that capacitor unit
lets the user replace it before additional failures occur.
Protection for Reactors
When a developing turn-to-turn fault occurs in any phase winding, the ungrounded, wye-
connected shunt reactor is protected from further damage by automatic switching initiated
by the S&C BankGuard PLUS Automatic Control Device. The control device isolates and
locks out the entire shunt reactor when a predetermined neutral-to-ground voltage is
exceeded.

BankGuard PLUS S&C Electric Company
Control Proprietary Information
10 Operation 1011-540 5-17-04
Figure 2
Capacitor Unit Power Frequency Overvoltage versus Time
(IEEE Standard 18-1992)
Automatic Control Features
The BankGuard PLUS control device includes all the automatic features described in this
section.
Bank/Reactor Lockout and Alarm
The lockout logic includes a user-selectable time delay (0.2 to 30 second). The time
delay insures that the fuse for the failing capacitor unit operates before the control
device locks out the bank. This lets you readily locate the failed capacitor unit.
The BankGuard PLUS Automatic Control Device includes a standard alarm function,
which provides an alarm signal (after a time delay) upon the loss of fewer capacitor
units than that corresponding to the lockout level setting. For many capacitor banks it
is practical to activate the alarm at the loss of a single capacitor unit. This is a decided
advantage since replacement of the failed capacitor unit can be accomplished at a
convenient, planned time, instead of on an urgent basis during a lockout resulting from
Voltage on Capacitor Unit,
Per Unit of Nameplate Voltage Rating
Time, seconds