Control Features (Circuit Breaker Control)

The SMD enables control of circuit breakers, within the SureSeT switchgear lineup.

Circuit breakers may be opened or closed, racked into the connected position, or racked out to the test/disconnected position.

Switchgear control may be performed in three different operating modes:

In Local mode by using the pushbuttons provided on the switchgear front panels.
In Nearby mode by using the SMD HMI or by wirelessly connecting a Wi-Fi capable device (smartphone, tablet, or laptop) to the dedicated SMD Wi-Fi network. The wireless connection allows an operator to control the switchgear from outside the arc flash boundary.

NOTE: Only one device may be connected to the HMI to operate the switchgear. Multiple device connections will result in a user interface lock. The lock is removed once only one device is connected to the HMI.
In Remote mode by connecting to EcoStruxure Power Monitoring Expert (EPME) or EcoStruxure Power Operation (EPO).

NOTE: The connection to third party supervisory systems is currently not supported.

Two control points define the SMD operating mode:

The “Local/Remote” selector switches (one per circuit breaker) located on the swithgear front panels.

Switchgear front panel with “Local/Remote” switch highlighted
A digital "Nearby Mode" toggle switch is located in the top-right corner of the SMD HMI homepage. To change the status of this toggle, the user must be logged into the SMD with a profile that has the appropriate permissions. For detailed instructions on how to operate the system interface and manage Nearby Mode, refer to GEX9033400, Substation Monitoring Device (SMD) SMD MV Enhanced User Guide

HMI with nearby mode on

SMD login popup

Local Mode

When the Local/Remote switch is set to “Local”, the switchgear may only be controlled by using the pushbuttons provided on the switchgear front panels.

Switchgear front panels pushbuttons and selector switches

Pressing the OPEN, CLOSE, RACK IN, or RACK OUT push buttons initiates circuit breaker operation, provided no interlocking conditions are active.

If the DELAY switch is set to OFF, operations begin immediately when a command is issued. If the switch is ON, a countdown is initiated before the operation is executed. By default, this countdown lasts 10 seconds, but it can be adjusted in the MCM200 configuration using EcoStruxure Power Commission. During the countdown, the "SELECTED TO OPERATE" indicator light blinks to confirm that a delayed operation is in progress. If an interlocking condition arises during the countdown, the countdown continues. However, if the interlocking condition is still active when the countdown ends, the operation will not be executed.

The MCM200 OVERRIDE switch allows the circuit breaker to be electrically opened or closed in local mode when the MCM200 is not operational. When the override is OFF, all control commands are processed through the MCM200, and interlocking contacts are connected to the MCM200 digital inputs. When the override is ON, the panel pushbutton contacts can directly energize the circuit breaker coils. In this mode, interlocking contacts are switched to the close coil circuits, blocking the circuit breaker from closing if any locking conditions are active. It recommended to ensure the MCM200 OVERRIDE switch is in the “OFF” position prior to switching to nearby or remote mode.

The SELECTED TO OPERATE light provides visual indication of the following conditions:

A delayed operation countdown is ongoing (blinks once a second).
An operation is ongoing (blinks twice a second).
A circuit breaker is selected for operation in Nearby Remote mode (light solidly lit). This light provides indication of the circuit breaker that has been selected for operation on the SMD HMI or EcoStruxure SCADA (Power Operation or Power Monitoring Expert).

Nearby Mode

When the Local/Remote switch is set to “Remote” and the digital “Nearby Mode” toggle switch is activated, the switchgear may only be controlled by using the SMD HMI or by wirelessly connecting a device to the the switchgear. To allow the device control screen to be launched on the SMD HMI, the digital toggle switch “Control Mode” needs to be activated.

HMI screen with Control Mode Activated

In nearby mode, remote operation commands sent over Modbus TCP/IP by a supervisory system (EPME or EPO) will not be executed.

NOTE: If the system is in nearby mode and the MCM200 override switch is in the "ON" position, open and close commands sent via the HMI will not execute. Ensure the MCM200 override switch is in the "OFF" position when in nearby mode.

Refer to document GEX9033400, Substation Monitoring Device (SMD) SMD MV Enhanced User Guide for details on how to operate the system user interface in order to control circuit breakers in nearby mode.

DANGER
HAZARD OF ELECTRICAL SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029–STPS. or CSA Z462 or local equivalent. This equipment must be only be installed and serviced by qualified electrical personnel. Turn off power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Ensure that personnel are outside of the arc flash boundary when in Nearby mode because operation may be executed remotely. Beware of potential hazards, and carefully inspect the work area for tools and objects that may have been left inside the equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRICAL SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029–STPS. or CSA Z462 or local equivalent.
This equipment must be only be installed and serviced by qualified electrical personnel.
Turn off power supplying this equipment before working on or inside equipment.
Always use a properly rated voltage sensing device to confirm power is off.
Ensure that personnel are outside of the arc flash boundary when in Nearby mode because operation may be executed remotely.
Beware of potential hazards, and carefully inspect the work area for tools and objects that may have been left inside the equipment.

Failure to follow these instructions will result in death or serious injury.

NOTE: Use the SELECTED FOR OPERATION light to confirm the correct breaker has been selected for operation.

Remote Mode

When the Local/Remote switch is set to “Remote” and the digital “Nearby Mode” toggle switch is deactivated, the switchgear may only be controlled by the connected supervisory system (EPME or EPO) or by any external contacts wired to the provisions for Close or Trip Contacts Active in Remote Mode (refer to switchgear factory drawings).

HMI with Nearby mode deactivated

NOTE: If the system is in remote mode and the MCM200 override switch is in the “ON” position, open and close commands sent via the supervisory system or by any external contacts wired to the provisions for Close or Trip Contacts Active in Remote Mode will not execute. Ensure the MCM200 override switch is in the “OFF” position when in remote mode.

DANGER
HAZARD OF ELECTRICAL SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029–STPS. or CSA Z462 or local equivalent. This equipment must be only be installed and serviced by qualified electrical personnel. Turn off power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Ensure that personnel are outside of the arc flash boundary when in Nearby mode because operation may be executed remotely. Beware of potential hazards, and carefully inspect the work area for tools and objects that may have been left inside the equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRICAL SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029–STPS. or CSA Z462 or local equivalent.
This equipment must be only be installed and serviced by qualified electrical personnel.
Turn off power supplying this equipment before working on or inside equipment.
Always use a properly rated voltage sensing device to confirm power is off.
Ensure that personnel are outside of the arc flash boundary when in Nearby mode because operation may be executed remotely.
Beware of potential hazards, and carefully inspect the work area for tools and objects that may have been left inside the equipment.

Failure to follow these instructions will result in death or serious injury.

NOTE: Use the SELECTED FOR OPERATION light to confirm the correct breaker has been selected for operation.

Interlocking

In all operating modes, the following electrical interlocking rules apply to circuit breakers:

Circuit Breaker Close Operation Commands are not allowed if:
The circuit breaker close spring is not charged
An electrical or mechanical open signal is active and engaging the tripping kinematic chain of the circuit breaker mechanism
The circuit breaker is not in the open position. Open position is defined by the status of the auxiliary contacts (52/a contact in open position and 52/b contact in closed position)
The circuit breaker is in the travel position
Other operations are ongoing
Project specific interlocks wired to the MCM200 DI22 are active (refer to factory drawings)

In all operating modes, the following electrical interlocking rules apply to circuit breakers

Circuit breaker rack-in operation commands are not allowed if:		Circuit breaker rack-out operation commands are not allowed if:
The circuit breaker is not in the open position		The circuit breaker is not in the open position
The circuit breaker is not fully racked out in the disconnected position		The circuit breaker is already fully racked out in the disconnected position
The circuit breaker compartment door is open. In case the door is opened during the racking operation, the racking motor will stop		The circuit breaker compartment door is open. In case the door is opened during the racking operation, the racking motor will stop
The racking handle is inserted in the circuit breaker truck’s racking port or the red racking/emergency trip push button on the circuit breaker truck is depressed		The racking handle is inserted in the circuit breaker truck’s racking port or the red racking/emergency trip push button on the circuit breaker truck is pressed
Padlocks are applied to the red racking/emergency trip push button on the circuit breaker truck		Padlocks are applied to the red racking/emergency trip push button on the circuit breaker truck
Padlocks or key locks are applied to the Lock-Out/Tag-Out provision of the circuit breaker compartment		Padlocks or key locks are applied to the Lock-Out/Tag-Out provision of the circuit breaker compartment
Other operations are ongoing		Other operations are ongoing
The truck locking magnet (optional feature) is deenergized		The truck locking magnet (optional feature) is deenergized
Project specific interlocks wired to the MCM200 DI19 are active (refer to factory drawings)		Project specific interlocks wired to the MCM200 DI19 are active (refer to factory drawings)

NOTE: Protective relay trip contacts are wired directly to the circuit breaker coils, allowing the protective relay functions to remain active regardless of the selected operating mode.

NOTE: Each circuit breaker is provided with a red racking/emergency trip push button. The operation of the red racking/emergency trip push button is independent from the operating mode settings.

WARNING
DEFEATING SETTING OF THE OPERATING MODE Use the provision for External Protection Trip contact in case external protective devices are to be wired to the trip circuit (refer to switchgear factory drawings) Use the provision for Trip or Close Contacts Active in Remote Mode in case external control devices are to be wired to the trip or close circuits (refer to switchgear factory drawings) Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING

DEFEATING SETTING OF THE OPERATING MODE

Use the provision for External Protection Trip contact in case external protective devices are to be wired to the trip circuit (refer to switchgear factory drawings)
Use the provision for Trip or Close Contacts Active in Remote Mode in case external control devices are to be wired to the trip or close circuits (refer to switchgear factory drawings)

Failure to follow these instructions can result in death, serious injury, or equipment damage.

NOTE: Hardwiring additional external control contacts directly to the trip or close coils without the interlocking of the Local/Remote switch (43L/R) may provide a second point of control that defeats the setting of the operating mode.