Warnings, Cautions, and Notes as used in this publication
Warnings
WARNING!Warning notices are used in this publication to emphasize that hazardous voltages,
currents, or other conditions that could cause personal injury exist in this equipment or may be
associated with its use.
Warning notices are also used for situations in which inattention or lack of equipment knowledge
could cause either personal injury or damage to equipment.
Cautions
CAUTION:Caution notices are used for situations in which equipment might be damaged if care is
not taken.
Notes
NOTE:Notes call attention to information that is especially significant to understanding and
operating the equipment.
This document is based on information available at the time of its publication. While efforts have been
made to ensure accuracy, the information contained herein does not cover all details or variations in
hardware and software, nor does it provide for every possible contingency in connection with
installation, operation, and maintenance. Features may be described in here that are not present in all
hardware and software systems. GE Consumer & Industrial assumes no obligation of notice to holders
of this document with respect to changes subsequently made.
GE Consumer & Industrial makes no representation or warranty, expressed, implied, or statutory, with
respect to, and assumes no responsibility for the accuracy, completeness, sufficiency, or usefulness of
the information contained herein. No warrantees of merchantability or fitness for purpose shall apply.
Entellisys™, EntelliGuard™, and FlexLogic™ are trademarks of the General Electric Company.
Modbus RTU is a registered trademark of AEG Schneider Automation.
Second revision. Corresponds to Entellisys HMI versions 4.0 and 4.01.
Please have your Entellisys System Summary # and Sub # ready when calling. This information can be
found on the Entellisys HMI on the System Health screen by clicking the Job Info button.
Post Sales Service
GE Switchgear
510 Agency Road
West Burlington, IA 52655
The Entellisys™ Low-Voltage Switchgear architecture is unique. The central processor unit (CPU)
is the basis of this new protection-and-control architecture. The CPU provides protection and
control functions over the entire low-voltage switchgear system.
The key advantage of this architecture is that the CPU has all the information from all circuit
breakers simultaneously. The architecture also has built in redundancy to increase system
availability.
Current transformers (CTs) and potential transformers (PTs) measure current and voltage and
transmit the analog information to the EntelliGuard™. The Messenger digitizes and sends the
information over the Messenger communication network to two redundant CPUs.
The CPUs make protection decisions, capture events, process waveform data, and provide
status information. For example, if the CPUs identify a trip condition at a circuit breaker, the CPU
alerts the EntelliGuard Messenger at that circuit breaker, which then actuates the circuit breaker
and returns the circuit breaker status to the CPU.
Modbus
external components such as the Entellisys HMI, SCADA, or other Building Automation Systems.
The Human Machine Interface (HMI) is the central user interface for the system. HMIs are
touchscreen computers located in-gear or near-gear (see Touchscreen HMI
Remote HMIs are available for desktop users who want to view the switchgear from their office.
®
communication, an open industry standard protocol, is provided as an interface to
on page 24) and
Description of operation13
Discrete I/O is provided for customer-specific inputs and outputs. This equipment is resident in
1
the switchgear and is connected through the CPUs. Discrete I/O and custom control schemes
will run in the CPUs if enabled.
In summary, Entellisys changes the protection paradigm from individual circuit protection to
system protection.
CAUTION:Users that have been assigned Group Permissions by the System Administrator for
features that allow the changing of settings and/or access to control functions must be
established as qualified personnel only. See Chapter 4 in DEH-430, Entellisys Low Voltage
Switchgear System Administrator Manual, for more information about programming user
permissions. As a reminder, users with such privileges will be presented with the following
screen upon initial login:
Figure 1-2 Initial login Caution screen
1.2 Switchgear installations
There are two primary installation methods in the switchgear:
•Standard
•Split-redundant
With standard installation, redundant components such as the CPUs, Messenger switches, and
UPSs are installed together in the equipment. This method optimizes footprint and convenience
of maintenance.
With split-redundant installation, redundant components such as the CPUs, Messenger
switches, and UPSs are split-up with at least one switchgear stack separating them. This
method optimizes system availability.
For more information, see DEH-237 Entellisys Low Voltage Switchgear Installation and
Maintenance Instruction Guide.
System architecture14
1.3 System components
Following are brief descriptions of each component in the Entellisys system.
1.3.1 EntelliGuard circuit breaker
EntelliGuard low-voltage power circuit breakers control and protect power circuits up to
600 volts. They will safely switch loads and automatically clear circuits when abnormal
conditions occur. These include short circuits, sustained overloads, ground faults, and other
programmable conditions.
The EntelliGuard circuit breakers are available in 800 ampere, 1,600 ampere, 2,000 ampere,
3,200 ampere, 4,000 ampere, and 5,000 ampere frame sizes. These values represent the
maximum continuous-current rating of each frame.
Circuit breakers may be equipped with a combination of accessories and interlocking devices.
Figure 1-3 EntelliGuard small frame circuit breaker
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•The network interlock accessory selectively prevents the closing of specific circuit
breakers in the electrical distribution network. The CPU sets and resets network interlock
devices remotely while continuously monitoring their status. For example, in a
double-ended substation, these devices could be used to interlock the main and tie
circuit breakers to prevent connecting two unsynchronized power sources.
•The bell alarm lockout accessory prevents a circuit breaker from closing after receiving
a trip command from the EntelliGuard Messenger. Closing of the circuit breaker is
permitted only after the lockout is reset manually at the front of the circuit breaker.
For more information, see the following EntelliGuard Circuit Breaker Instruction Books:
•DEH-201 EntelliGuard Power Circuit Breakers 800-2,000A Frames, 240-600Vac Users Guide
•DEH-202 EntelliGuard Power Circuit Breakers 3,200-5,000A Frames, 240-600Vac Users Guide
System components15
1
1.3.2 Current transformers
Current transformers (CTs) are sensors that measure current. Each circuit breaker requires input
from three CTs (one per phase) and an optional neutral CT. Unlike traditional switchgear, this
single set of CTs provides the necessary current sensing for all needs including protection,
metering, and control.
The CTs are attached to the power bus behind the circuit breaker in the circuit breaker
compartment. Only Entellisys CTs may be used with the Entellisys system.
CTs either come in a 3-pack (shown in Figure 1-4) or as single CTs.
Figure 1-4 CT 3-pack
System architecture16
1.3.3 Potential transformers
Potential or voltage transformers (PTs) are sensors that measure voltage. Unlike traditional
switchgear, only the main (or source) circuit breakers in the system require PTs. This hardware
and wiring reduction is possible because of the central processor architecture and the sampling
synchronization maintained by the system.
Three PTs, one for each phase, are required on the main circuit breakers in the system. The
remaining circuit breakers reference one circuit breaker with physical PTs and use that source's
voltage readings for metering calculations. This source reference may change as the system
topology changes.
The PTs are located outside the circuit breaker compartments in auxiliary compartments.
Figure 1-5 Entellisys PT
1
System components17
1
1.3.4 EntelliGuard Messenger
The EntelliGuard Messenger electronic device provides the interface between the circuit
breakers and the CPUs in the Entellisys system.
The following is a summary of the Messenger’s functionality:
•Digitizes all switchgear signals
•Communicates the raw samples to CPUs via the Messenger network
•Controls the circuit breaker
•Performs independent backup trip capability at all times
•Powered by dual 120v control power sources or self-powered from the current sensors
•Provides LED illumination of circuit breaker status, power status, communication status, and
GE “Locator” information
•Provides seal-able switches to set CT rating, and (long time) multiplier setting
•Provides a test connector for trip curve testing using the Entellisys System Test Kit
1.3.4.1 Messenger User Interface
The Messenger User Interface, as show in Figure 1-6, is described below.
Figure 1-6 Messenger front
LED Indicator Lights
•Locate: LED blinks for 10 or 30 seconds on command from the HMI to help operator
physically locate a circuit breaker in the switchgear lineup.
•Com1, Com2: Illuminates when Ethernet communication is plugged in and ready to
communicate.
•Power: Illuminates when either Control Power A or Control Power B sources are powering the
messenger.
•Circuit Breaker Status Open: Illuminates when the circuit breaker is Open. This sensor is
independent of the circuit breaker Close sensor.
•Circuit Breaker Status Closed: Illuminates when the circuit breaker is Closed. This sensor is
independent of the circuit breaker Open sensor.
Switches
•Rating: Ampere rating of the circuit in use. Maximum value is the CT Rating.
•Setting: Multiplier setting for Long Time Overcurrent Protection, specified as X times the
Rating switch value.
Rating Label
•Frame: Circuit breaker frame size, in Amperes, represents the maximum continuous-current
rating.
•CT: Maximum Ampere rating of the CTs.
System architecture18
Test Connector
Connection point between the Entellisys System Test Kit and the Messenger.
Figure 1-7 EntelliGuard Messenger
The Messenger is located directly above the circuit breaker compartment.
1.3.5 Compartment ID button
The Compartment ID button stores compartment configuration information in non-volatile
memory. It informs the system about the circuit breaker residing in the cubicle.
The Compartment ID button is shipped inserted into the EntelliGuard Messenger, tethered to the
equipment, and does not require any user interface during normal operation. It remains within
the switchgear cubicle at all times.
1
WARNING!Compartment ID buttons are set at the factory and are not interchangeable
between compartments. Failure to utilize the correct compartment ID button can result in
personal injury and damage to equipment.
The ID button provides the system with necessary information such as circuit breaker frame
size, CT size, and overcurrent protection capabilities as follows:
•Ground fault protection always on
•Ground fault protection always off
•Ground fault protection switchable (enabled/disabled) in the HMI
If the ground fault protection options need to change, a replacement ID button must be ordered
(GE CAT# ETSCOMPID).
System components19
Figure 1-8 Compartment ID Button un-tethered from switchgear
1
1.3.6 Messenger communications network
The Messenger communications networks are closed, dedicated LANs for transmitting
information between the Messengers and the CPUs in the system. The LANs are for the
Entellisys system only and should never be connected to other networks.
CAUTION:Failure to maintain a dedicated LAN will result in the EntelliGuard Messenger
reverting to back-up Overcurrent protection.
A Messenger switch is required to route information appropriately. The communication wiring
required is 100BaseT, CAT5 cables.
Each CPU resides on a separate network, providing redundant communications.
1.3.7 Messenger switch
The Messenger switch enables the communication network between the Messengers and
corresponding CPU. A Messenger switch is required for each of the two redundant networks. The
number of ports provided is determined by the number of circuit breakers in the system. Each
circuit breaker requires its own port in the switch.
The largest switch provides only 24 ports. If the number of circuit breakers in the system
exceeds 22, a pyramid switch scheme, utilizing multiple switches, is required.
System architecture20
1.3.8 CPU
1
The CPU is a rack-mount industrial computer running a real-time operating system. The CPU
provides the processing capability to support all switchgear functions. Two redundant CPUs
(CPU A and CPU B) are used per lineup, supporting up to 30 circuit breakers.
The CPUs run simultaneously. If one CPU has an issue, the other continues to run providing
redundancy. One CPU should be running at all times to maintain the highest level of protection.
In the event that the Messenger-to-CPU communication network is down or power to the CPU is
not available, the EntelliGuard Messenger will provide back-up overcurrent protection
functionality.
The redundant CPUs are synchronized by a common connection to a synch clock. Each CPU has
a slot for synch clock, although only one synch clock is used per system. The synch clock is
programmed for either 60 Hertz or 50 Hertz frequency operation.
Each CPU has two slots for optional discrete I/O cards.
Figure 1-9 Redundant CPUs with synch clock connection
1.3.9 Synch clock
To maintain system synchronization, a mechanism exists to provide a single sampling time
source. This time source is provided on a separate hardware card, called the Synch Clock. The
Synch Clock sits in CPU A and has a connection to CPU B.
In the event of an issue with the Synch Clock or its connections, the CPUs fall-back to software
synch functionality. When this occurs CPU A maintains full functionality. As time drifts, CPU B
may suspend advanced multi-source protection and may not be able to provide metering
information for the circuit breakers without PTs. If CPU A is powered down to provide
maintenance, CPU B will continue to run all functions.
System components21
1
1.3.10 Discrete I/O
The discrete I/O equipment provides programmable input and output logic for
customer-specific requirements.
Examples include the following:
•Sound a horn when a circuit breaker is open
•Trigger an output when voltage exceeds a value
The redundant discrete I/O option provides signal processing to/from either CPU. One CPU (the
Master) processes the information and responds. The other provides a backup of the Master
fails. Redundant discrete I/O is recommended if any of the signals are critical to the operation of
the system. Critical I/O examples include the following:
•Inputs to automatic throw-over schemes
•Inputs that must trip circuit breaker (such as high transformer pressure)
For more information on discrete I/O, see Discrete I/O
1.3.10.1 Discrete I/O cards
The input and output signals from the CPU are transferred through the discrete I/O cards. Each
card supports 64 bi-directional points that range from 0 to 5 volts. A maximum of two cards
may be inserted for a total of 128 I/O points. The cards come installed in the CPU upon
purchase.
1.3.10.2 Discrete I/O cable
This cable connects the discrete I/O card to the terminal block. Each cable transmits 64 I/O
points.
1.3.10.3 Terminal block
The terminal block accepts 64 I/O signals from the discrete I/O card through a single cable and
breaks out the individual signals into 64 terminals for wiring.
1.3.10.4 “OR” boards
These boards are only required for redundant discrete I/O. The output signals from both CPUs
must be “Horde” together, between the terminal blocks and the relay blocks, to prevent
increased voltages from damaging the relays. Each “OR” board supports 16 output signals.
on page 149.
1.3.10.5 Relay blocks
The relay blocks hold solid state input and output relays (16 per block).
Relay blocks are configured as all inputs or all outputs. Unused discrete I/O points may have
relays left off.
1.3.10.6 Relays
The input relays transform the customer input (120 Vac or 24-125 Vdc) to 5V inputs for the
Entellisys system.
The output relays are either opened or closed based on programmable logic in the Entellisys
system.
System architecture22
1.3.10.7 Discrete I/O customer interface wiring
The customer interface to the discrete I/O is provided at the I/O module relay blocks. These relay
blocks and the customer wire termination points are mounted in the discrete I/O cubicle and are
accessed from the front of the switchgear. Control conduits are terminated in the rear cable
compartment and the discrete I/O wiring is routed to the front of the switchgear through an
opening in the discrete I/O cubicle rear barrier.
1.3.11 System interface Ethernet communication network
The system interface Ethernet communication network is a 10/100 Mbps Ethernet LAN that
provides an interface into the Entellisys system for systems such as the Entellisys HMI, SCADA
systems, building automation, HVAC systems or other. The system interface Ethernet
communication network provides information and control of all circuit breakers in the system.
The external communications network will use 100BaseT (copper twisted pair) CAT5 or better
cabling. A fiber optic connection is available as an option.
1.3.12 System interface Ethernet switch
The interface between the Entellisys system and the external world is through the system
interface Ethernet switch, an industrial hardened 10/100 Mbps Ethernet switch. An 8-port
copper model is standard. Optionally customers may choose a 9-port model with an additional
fiber port for external gear communication. The fiber port supports 100FL connections only.
1
Figure 1-10 Ethernet switch, 8-port
System components23
1
1.3.13 Touchscreen HMI
The system interface for the Entellisys switchgear will be through one or more touchscreen
computer displays. The display is driven by a separate computer and communicates to the
CPUs through an Ethernet connection. The System Interface Ethernet Switch provides the
physical interface.
The HMI communicates primarily with one of the CPUs but can switch to the other in event of a
failure. Functionality provided by the HMI includes:
•Programmable user login to grant/deny access to specific features
•Animated one-line that shows the current status of the entire system
•Circuit breaker status, circuit breaker control
•Metering, demand logging, harmonics
•User settings for overcurrent protection, relay protection, advanced multi-source protection.
This may be writable or read-only depending on permissions granted.
•Customer-specific discrete I/O programming and status
•Customer-specific control scheme programming and status
•Sequence of events
•System health – showing the health of the Entellisys equipment
•Alarm panel – setup, panel status, e-mail configuration for alarms
NOTE:The HMI is not critical to the protection functionality of the system. The HMI can be
brought down for service with no loss of protection in the system.
1.3.13.1 In-gear HMI
Typically a touchscreen HMI is installed in the switchgear. This is deemed an “in-gear” HMI.
A redundant in-gear HMI is available as an option. The redundant HMI is also a touchscreen HMI
located in the gear.
1.3.13.2 Near-gear HMI
Optionally, a touchscreen HMI may be installed near the switchgear equipment, but away from
the hazardous arc flash zone. This can be in a separate stack or in a wall-mount box up to
250 feet from the switchgear. This is deemed a “near-gear” HMI.
System architecture24
1.3.14 Remote HMI
The Entellisys system offers desktop access to the switchgear with the same HMI software
installed in the gear. The remote HMI software can be installed on any Windows 2000 desktop
computer and requires an intranet connection to the switchgear. The intranet connection is
connected to the system interface Ethernet switch.
Two versions of remote HMI are offered:
•User Interactive
Permissions are programmable and can be set for full Administrator access down to Guest
access.
•Viewer
Allows read-only access to the system.
1.3.15 VPN firewall device
Virtual Private Network (VPN) firewall device provides business-class network security providing
Denial of Service (DoS) protection and intrusion detection using Stateful Packet Inspection (SPI),
URL access and content filtering, logging, reporting, and real-time alerts. Up to eight users can
access the system simultaneously.
1
It is strongly recommended that anytime an Entellisys system is connected to the intranet, a
VPN firewall be installed to protect the Entellisys system from network threats.
For more information, see DEH-430 Entellisys Low Voltage Switchgear System Administrator
Manual.
1.3.16 Control power
Control Power is 120 Vac, 50 and 60 Hz only. Uninterruptible power is provided standard with
each system. The control power scheme is specific to each installation and constructed from
standard elements using defined practices for Entellisys control power distribution.
1.3.17 UPS
Two Universal Power Supplies are installed in the switchgear to provide backup power to the
control power network. The UPSs are powered from the primary power buses (utility or
generator) and are redundant.
The UPS serves all 120 Vac control power network devices. It does not power the charging
motors of electrically operated circuit breakers.
For more information on the Control Power Network, see Control power and UPS configuration
on page 209.
For more information on the UPS, see the “GE Digital Energy GT Series™ - UL, Product
Description” at www.gedigitalenergy.com
.
System components25
1
1.3.18 UPS to HMI connection
The Entellisys system provides event/alarm/e-mail information when the UPS A has gone on
battery backup and when the batteries are low. When the batteries are low, the HMI safely shuts
down to avoid abrupt power interruption. To enable this communication, a link between UPS A
and the primary touchscreen HMI is established. This link is a serial connection between the
DB-9 serial port connection on the UPS and the DB-9 serial port connection on the HMI. Since
distances between the HMI and UPS may exceed serial cable distances, a pair of RS-232 to
RS-485 converters are installed at each end to accommodate the cabling distance through the
switchgear.
1.3.19 RS-232 to RS-485 converter
This device converts RS-232 signals to RS-485 signals. This is required to support the cable
lengths in the switchgear. RS-232 imposes a distance limitation of only 15 meters. RS-485 can
transmit data over distances up to 1.2 km.
1.3.20 Entellisys System Test Kit
The Entellisys System Test Kit is a portable test instrument designed for field testing of the
Entellisys Low-Voltage Switchgear system.
The test kit includes the following features:
•Simulate power-line characteristics for a single circuit breaker in the Entellisys Low-Voltage
System
•Verify the function/operation of the protection system
•Overcurrent protection tests – long time, short time, instantaneous and ground fault
protection tests
•Single point relay protection tests (overvoltage, undervoltage, over frequency, under
frequency, power reversal and phase loss, high current test)
•Verify the calibration of the trip time current curve
•Verify the operation of the circuit breaker actuation in “Trip mode”
•Perform tests without trips in “No Trip mode”
•Ground Fault Defeat function provides temporarily suspension of all ground fault protection
in the system
•Automatically retrieves system configuration for increased productivity
•Displays a summary of all protection configuration
•Saves test results to be reviewed later
•Windows Interface for ease of use
•Operation from 120 Vac
For more information, see DEH-233 Entellisys Low Voltage Switchgear System Test Kit User
Manual.
1.3.21 Clamp circuit
The clamp circuit is an intermediary device between the CTs with 150ampere and 400ampere
ratings only. The clamp circuit protects the Messenger from large current outputs from the CTs.
The clamp circuit is installed in the circuit breaker compartment on the left-hand side sheet.
System architecture26
2Specifications
2.1 Environmental
Storage/shipping temperatures
–40 to 85° C
Operating temperatures
0 to 40° C ambient, indoor use
Humidity
5% to 95%, non-condensing, indoor use
2.2 Type tests
Tests are split into two categories:
•EntelliGuard Messenger Tests – the primary protection control element