GE CB Watch 3 User manual

CBW3 User Manual v6.3 May 2019
GE
Grid Solutions
CB Watch 3
Circuit Breaker Monitoring System
User Manual

CB Watch 3 User Manual v6.3 - May 2019 Page 2 of 100
Contents
Topic Page
INTRODUCTION .........................................................................................8
Product Overview..................................................................................................................8
Document Scope...................................................................................................................8
Abbreviations & Definitions ..............................................................................................8
SYSTEM DESCRIPTION...............................................................................9
Modules .....................................................................................................................................9
Sensors ......................................................................................................................................9
HUMAN MACHINE INTERFACE (HMI).....................................................10
Introduction ..........................................................................................................................10
TCP/IP configuration.........................................................................................................10
Connecting to the CBW3.................................................................................................12
Access Levels .......................................................................................................................14
Language...............................................................................................................................14
Navigation.............................................................................................................................14
Software version.................................................................................................................16
Changing Passwords........................................................................................................16
OPERATION/TIMING MONITORING ......................................................17
Introduction ..........................................................................................................................17
Functionalities available Without Travel Sensor..................................................17
Additional Functionalities With Travel Sensor*.....................................................26
Timing Compensation......................................................................................................31
Setting Alarms .....................................................................................................................33
SF6 GAS MONITORING............................................................................36
General Description ..........................................................................................................36
Gas Measurements ...........................................................................................................38
Setting Alarms .....................................................................................................................47
CONTACT WEAR MONITORING .............................................................49
General Description ..........................................................................................................49
Interrupted Current ...........................................................................................................49
Arcing Time ...........................................................................................................................50
Arcing contact wear .........................................................................................................52
Setting Alarms .....................................................................................................................54
CONTROL CIRCUIT MONITORING .........................................................56
General description...........................................................................................................56
DC Supply ..............................................................................................................................56
Coil Integrity .........................................................................................................................57
Coil continuity......................................................................................................................61
Setting Alarms .....................................................................................................................62
STORED ENERGY SYSTEM MONITORING..............................................65
General Description ..........................................................................................................65
Spring Mechanism.............................................................................................................65
Setting Spring Alarms.......................................................................................................70
Pneumatic/hydraulic Pressure ....................................................................................71
Setting Pump Alarms........................................................................................................76
CB OPERATION GRAPHS.........................................................................78

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HMI Graphs ...........................................................................................................................78
COMTRADE Graphs............................................................................................................83
HEATER MONITORING ............................................................................85
General Description ..........................................................................................................85
Ambient temperature.......................................................................................................86
Heater temperature..........................................................................................................87
Setting temperature alarms..........................................................................................88
GENERIC ANALOGUE CHANNEL MONITORING ..................................90
General Description ..........................................................................................................90
Configuration .......................................................................................................................90
Alarms .....................................................................................................................................91
DRY CONTACT RELAY ALARMS..............................................................92
General Description ..........................................................................................................92
Available alarm relays .....................................................................................................92
Alarm assignment to each relay.................................................................................93
Clearing alarms...................................................................................................................94
DIGITAL COMMUNICATION....................................................................95
Protocols ................................................................................................................................95
REMOTE ASSISTANCE..............................................................................96
Assistance File .....................................................................................................................96
Product/System Files........................................................................................................96
TECHNICAL SPECIFICATION......................................................................98
Measurements.....................................................................................................................98
Contact & Copyright Details ................................................................... 100

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Illustrations
Figure 1 –CBW3 Modules.......................................................................................................................... 9
Figure 2 –examples of sensors used ......................................................................................................... 9
Figure 3 –Network card configuration step 1 ......................................................................................... 10
Figure 4 –Network card configuration step 2 ......................................................................................... 10
Figure 5 –Network card configuration step 3 ......................................................................................... 11
Figure 6 –CBW3 network connections.................................................................................................... 11
Figure 7 –Connection to the CBW3......................................................................................................... 12
Figure 8 –Connection warning................................................................................................................ 12
Figure 9 –Connection advanced page..................................................................................................... 13
Figure 10 –HMI CBW3 log in ................................................................................................................... 13
Figure 11 –HMI language selection......................................................................................................... 14
Figure 12 –HMI secondary toolbar for System section........................................................................... 15
Figure 13 –CBW3 product information................................................................................................... 15
Figure 14 –Set button example............................................................................................................... 15
Figure 15 –Changing password ............................................................................................................... 16
Figure 16 –Number of opening/closing operation.................................................................................. 17
Figure 17 –Initial setting of number of operations................................................................................. 18
Figure 18 –Setting operation counter alarms......................................................................................... 18
Figure 19 –Auxiliary contact status......................................................................................................... 18
Figure 20 –Pole discrepancy timeout threshold..................................................................................... 18
Figure 21 –Pole discrepancy alarm ......................................................................................................... 19
Figure 22 –Setting operation counter alarms......................................................................................... 19
Figure 23 –Auxiliary contact timing ........................................................................................................ 20
Figure 24 –Auxiliary contact opening and closing graphs....................................................................... 20
Figure 25 –Auxiliary contacts switching threshold ................................................................................. 20
Figure 26 –Monitoring the auxiliary contacts......................................................................................... 20
Figure 27 –Operating time measurement .............................................................................................. 21
Figure 28 –Last operation measurements.............................................................................................. 22
Figure 29 –Operating time discordances................................................................................................ 23
Figure 30 –Entry of key distances ........................................................................................................... 23
Figure 31 –Separation and touching speed ............................................................................................ 24
Figure 32 –Operation timing alarms thresholds ..................................................................................... 24
Figure 33 –Alarms related to operation timing ...................................................................................... 25
Figure 34 –Entry of distances.................................................................................................................. 26
Figure 35 –Operation graphs for opening............................................................................................... 27
Figure 36 –Operation graph for closing .................................................................................................. 27
Figure 37 –Monitoring the auxiliary contacts......................................................................................... 28
Figure 38 –Monitoring the auxiliary contacts......................................................................................... 28
Figure 39 –Monitoring the overtravel..................................................................................................... 29
Figure 40 –Displaying overtravel............................................................................................................. 29
Figure 41 –Overtravel threshold............................................................................................................. 30
Figure 42 –Overtravel alarm ................................................................................................................... 30
Figure 43 –Timing compensation............................................................................................................ 31
Figure 44 –Two examples of operating time temperature compensation values.................................. 32
Figure 45 –Example of closing operating time changes with voltage changes....................................... 32

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Figure 46 –Thermodynamic law applied to SF6 gas................................................................................ 36
Figure 47 –Equivalent density lines and liquefaction curve ................................................................... 37
Figure 48 –Gas sensor alarms ................................................................................................................. 37
Figure 49 –Gas measurements ............................................................................................................... 38
Figure 50 –gas pressure thresholds ........................................................................................................ 39
Figure 51 –Gas thresholds....................................................................................................................... 40
Figure 52 –Gas alarms............................................................................................................................. 40
Figure 53 –gas liquefaction pressure ...................................................................................................... 40
Figure 54 –Gas alarms............................................................................................................................. 41
Figure 55 –Gas moisture level................................................................................................................. 41
Figure 56 –Moisture alarm threshold..................................................................................................... 41
Figure 57 –Excessive moisture alarm...................................................................................................... 42
Figure 61 –Linear gas pressure extrapolation......................................................................................... 42
Figure 62 –Time horizons setup.............................................................................................................. 43
Figure 63 –Forecasted gas pressure values ............................................................................................ 43
Figure 66 –Gas leak rates (ganged CB).................................................................................................... 44
Figure 67 –Gas leak rates (IPO CB).......................................................................................................... 44
Figure 64 –Gas alarms............................................................................................................................. 44
Figure 58 –gas graph selection................................................................................................................ 45
Figure 59 –Short-term gas graphs........................................................................................................... 45
Figure 60 –Long-term gas graphs............................................................................................................ 46
Figure 72 –Gas level data........................................................................................................................ 47
Figure 73 –Setting primary current measurement ................................................................................. 49
Figure 74 –Current before and during interruption................................................................................ 49
Figure 75 –Interrupted current value ..................................................................................................... 50
Figure 76 –Stored interrupted current curve.......................................................................................... 50
Figure 77 –Separation offset input ......................................................................................................... 51
Figure 78 –Opening operation timing diagram....................................................................................... 51
Figure 79 –Arcing time............................................................................................................................ 51
Figure 80 –Max arcing time threshold.................................................................................................... 51
Figure 81 –Max arcing time threshold.................................................................................................... 52
Figure 82 –Contact electrical wear cumulative value............................................................................. 52
Figure 83 –Initial electrical wear setting................................................................................................. 52
Figure 84 –Opening electrical wear thresholds ...................................................................................... 53
Figure 85 –Arcing contact electrical wear alarms................................................................................... 53
Figure 86 –Electrical wear weighting table............................................................................................. 53
Figure 87 –Contact wear alarm summary............................................................................................... 54
Figure 88 –Contact wear alarm summary............................................................................................... 55
Figure 89 –Continuous display of DC voltage for source 1 and 2 ........................................................... 56
Figure 90 –DC voltage in last operation measurements......................................................................... 56
Figure 91 –DC voltage alarm thresholds................................................................................................. 57
Figure 92 –DC voltage alarms ................................................................................................................. 57
Figure 93 –Coil currents and coil charges ............................................................................................... 57
Figure 94 –Change in coil charge ............................................................................................................ 58
Figure 95 –Graph of coil current during opening or closing operation .................................................. 59
Figure 96 –Drop-down list of previous archives ..................................................................................... 59
Figure 97 –Maximum mean current threshold settings ......................................................................... 60
Figure 98 –Coil charge alarms................................................................................................................. 60

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Figure 99 –Coil charge threshold settings............................................................................................... 60
Figure 100 –Coil charge alarms............................................................................................................... 60
Figure 101 –HMI - Coil circuit continuity alarm ...................................................................................... 61
Figure 102 –Control circuit monitoring alarms....................................................................................... 62
Figure 103 –DC voltage default settings ................................................................................................. 62
Figure 104 –Mean coil current max threshold calculation ..................................................................... 63
Figure 105 –Coil current and charge default settings............................................................................. 63
Figure 106 –Coil charge alarm threshold calculation.............................................................................. 63
Figure 107 –Coil continuity default setting............................................................................................. 64
Figure 108 –Type of energy storage system ........................................................................................... 65
Figure 109 –Spring rewind data.............................................................................................................. 66
Figure 110 –Spring motor initial values .................................................................................................. 66
Figure 111 –Spring rewind time thresholds............................................................................................ 66
Figure 112 –Motor run time alarms........................................................................................................ 67
Figure 113 –Spring rewind motor current data ...................................................................................... 67
Figure 114 –Spring rewind motor current alarm threshold.................................................................... 67
Figure 115 –Spring rewind motor current alarm setting ........................................................................ 68
Figure 116 –Drop-down list of previous archives ................................................................................... 68
Figure 117 –Operation charts for spring rewind..................................................................................... 69
Figure 118 –Spring energy storage mechanism alarms.......................................................................... 70
Figure 119 –Number of pumps setup ..................................................................................................... 71
Figure 120 –Pump run time .................................................................................................................... 71
Figure 121 –Pump data in last 24hr........................................................................................................ 72
Figure 122 –Historical pump data graphs............................................................................................... 72
Figure 123 –Pump operations alarm thresholds..................................................................................... 73
Figure 124 –Pump run time initial value................................................................................................. 73
Figure 125 –Pump operation alarms....................................................................................................... 73
Figure 126 –Pump motor current ........................................................................................................... 73
Figure 127 –Drop-down list of previous archives ................................................................................... 74
Figure 128 –Maximum inrush current .................................................................................................... 74
Figure 129 –Pump motor inrush current maximum threshold setting................................................... 74
Figure 130 –Pump motor inrush current alarm...................................................................................... 74
Figure 131 –Display of generic channels................................................................................................. 75
Figure 132 –Generic channel display...................................................................................................... 75
Figure 133 –Pump based energy storage mechanism alarms ................................................................ 76
Figure 134 –Operation graphs for opening............................................................................................. 78
Figure 135 –Operation charts for closing................................................................................................ 79
Figure 136 –Operation charts for spring rewind..................................................................................... 80
Figure 137 –Operation charts for pump motor ...................................................................................... 81
Figure 138 –Drop-down list of previous archives ................................................................................... 82
Figure 139 –Scaling graphs...................................................................................................................... 82
Figure 140 –COMTRADE files .................................................................................................................. 83
Figure 141 –Visualising a COMTRADE file............................................................................................... 84
Figure 142 –Number of PT100 sensors................................................................................................... 85
Figure 143 –Naming of PT100 sensors.................................................................................................... 85
Figure 144 –Display of PT100 sensors..................................................................................................... 85
Figure 145 –Ambient temperature......................................................................................................... 86
Figure 146 –Last operation temperature measurements....................................................................... 86

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Figure 147 –Thresholds for measured temperatures............................................................................. 87
Figure 148 –Thresholds for relative delta temperatures........................................................................ 88
Figure 149 –Temperature alarms............................................................................................................ 88
Figure 150 –Spring energy storage mechanism alarms.......................................................................... 88
Figure 151 –Spare analogue channels configuration.............................................................................. 90
Figure 152 –Spare analogue channels display ........................................................................................ 90
Figure 153 –Spare analogue channels alarm thresholds ........................................................................ 91
Figure 154 –Spare analogue channels alarms......................................................................................... 91
Figure 155 –Alarm colour coding............................................................................................................ 92
Figure 156 –Gas alarm assignments ....................................................................................................... 93
Figure 157 –Alarm sections for each monitoring function ..................................................................... 93
Figure 158 –Clearing gas related alarms................................................................................................. 94
Figure 159 –Clearing operations related alarms..................................................................................... 94
Figure 160 –Protocols available .............................................................................................................. 95
Figure 161 –Generating the remote assistance file................................................................................ 96
Figure 162 –Remote assistance file ........................................................................................................ 96
Figure 163 –uploading a product or system file ..................................................................................... 96

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INTRODUCTION
Product Overview
The CB Watch 3 system (often abbreviated as CBW3 in this manual) is a monitoring
system for high voltage circuit breakers. It monitors the following aspects:
▪Operation timing
▪SF6 gas leakage
▪Arcing contact wear
▪Coil circuits
▪Stored energy system (spring or pump)
▪Cabinet / tank heater temperature
A web server HMI is provided to both configure the system and review the data but
various communication protocols are also available to transmit the data to a Historian or
another software system.
Document Scope
This User Manual is intended to explain the various monitoring functionalities of the
CBW3 and how they can be used to monitor a high-voltage circuit breaker. All outputted
information is detailed as well as all the possible alarms that can be set. Communication
and system settings are also covered.
Please refer to the CBWatch3 Installation Manual for information on the various modules
and sensors comprising the CBW3 system. It provides all the necessary information to
install and connect them together and configure the system.
All the available CBW3 monitoring options are detailed in this user manual. Depending on
which configuration has been purchased and installed, all the functionalities described in
this document may not be available.
Abbreviations & Definitions
Abbreviation
Meaning
CBW3
CB Watch 3 System
CT
Current Transformer
HV
High Voltage
AC
Alternating Current
DC
Direct Current
HMI
Web-page based interface
IPO
Independent Pole Operation

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SYSTEM DESCRIPTION
Modules
The CBW3 system is comprised of both modules and sensors. The modules comprise the
processor module and the various I/O modules. They receive and process the signals
obtained from the sensors.
For more detailed information, please refer to the CBW3 Installation Manual.
Figure 1 –CBW3 Modules
1 Power supply 5 AI8-2 Module
2 ProWatch Module 6 AI8-3 Module
3 DI16 Module 7 RTD8 Module
4 AI8-1 Module 8 DO16 Module
Sensors
Depending on your CBW3 configuration, various sensors are connected to the modules,
either directly or through terminal blocs. These sensors acquire the data from the circuit
breaker so that it can be received by the corresponding I/O modules and processed in
the main ProWatch module. Please refer to the Installation Manual for details on sensors.
Figure 2 –examples of sensors used

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HUMAN MACHINE INTERFACE (HMI)
Introduction
The CB Watch 3 does not require the user to load a special software to connect to it and
access the information it captures. The CBW3 has a built-in web server and an integrated
Human Machine Interface (HMI) which is accessible from any web browser,
The HMI lets the user configure the system, set alarms and visualise all the measured
parameters, the alarm status and the curves/graphs recorded in memory.
TCP/IP configuration
Before you can access the CBW3’s HMI, you must first configure your network adapter
accordingly. Open Network Connections by clicking the Start button , and then
clicking Control Panel. In the search box, type adapter, and then, under Network and
Sharing Center, click View network connections. And then click “change adapter settings”
Figure 3 –Network card configuration step 1
Right-click the connection that you want to change, and then click Properties. If you're
prompted for an administrator password or confirmation, type the password or provide
confirmation.
Figure 4 –Network card configuration step 2

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In the window, select IPv4 IP address settings and click properties.
A new window (as shown below) will appear:
By default, the IP address of the CBW3 is set in the factory to: 192.168.5.22
But your particular IP address will have been set during the installation process. We will
use the default IP address here, purely as an example.
To communicate with the CBW3, you will need to set your network adapter to another
address on that network, for example: 192.168.5.30
The last number 30 could be between 1 and 254, with the exception of 22 (which is the
CBW3 address)
To do that, select “Use the following IP address” and enter:
-The IP address 192.168.5.30
-The sub-net mask 255.255.255.0
and then click OK
You can leave the DNS server settings blank
Figure 5 –Network card configuration step 3
Here is an example of a network connection layout. It is possible to have one or several
CBW3 connected on the same network in a substation.
Figure 6 –CBW3 network connections

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Connecting to the CBW3
Normally the CBW3 is fitted with a Fibre Optic (FO) LAN connection SFP module with LC
connector. To connect directly your laptop to the CBW3 you should either go through a
FO/RJ45 converter, a FO/USB converter or replace the FO SFP module by a suitable RJ45
SFP module (see picture below).
Warning: Standard 1Gbs RJ45 SFP modules will not work ! Only certain 100Mbs SFP
module actually work. Please contact GE to acquire a correct and tested SFP module.
Figure 7 –Connection to the CBW3
Alternatively connect onto (or VPN into) the same network as the one the CBW3 is on.
Launch any Internet browser (for example: “Google Chrome” or “Mozilla Firefox”, (but
preferably not “Internet Explorer” which is old and has compatibility issues) and enter the
CBW3’s IP address in the address line.
192.168.5.22
Because the CBW3 uses “https” secure encrypted communication and your browser will
not recognise the SSL security certificate, it will give you a warning that the
communication may be dangerous and unsecured.
Figure 8 –Connection warning

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Disregard and press the “Advanced” button which will reveal a “Proceed anyway” option.
Figure 9 –Connection advanced page
Please disregard the “unsafe” warning and proceed anyway to the IP address that you
know.
It is possible to save the IP address into your browser and tell it that it is trusted so that
the message will no re-appear the next time.
You will then get to the CBW3 welcome page which will ask you for authentication
Figure 10 –HMI CBW3 log in

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Access Levels
Access to the HMI and the data is restricted according to several username login levels,
each protected by passwords. The various increasing levels of access are listed below.
Each next level has the rights of the preceding level plus those listed:
1 Username: “user”Default password: leave blank
Access to all measurements and parameters is read-only
It is possible to change the language of the HMI
2 Username: “supervisor”Default password: “supervisor”
Only parameters for setting alarms are adjustable
It is possible to download parameters file
3 Username: “specialist”Default password: “specialist”
All of the parameters relative to the application are adjustable
In particular all those required for setting up the system
Language
Once you have access to the HMI of the CBW3, the language tab enables you to select
the language that the HMI will use. Click on the required flag first and then click on any
section of the top toolbar, the language will automatically change.
Figure 11 –HMI language selection
Navigation
Navigation through the menus is done by:
(1) Selecting one the menu section in the toolbar
-Measurements
-Settings
-System
-Overview
-Language

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(2) Selecting one of the tabs in the secondary menu/toolbar:
Figure 12 –HMI secondary toolbar for System section
From now on in this user manual, the steps needed to reach any screen shown will be
highlighted in black above the screen as per the example below:
As an example, if you wanted to visualise the firmware versions being used, you would
select the “System” section first and then the “Product info” tab.
HMI: System / Product Info
Figure 13 –CBW3 product information
Also in this user manual, we will often (as in the example above) mask part of the page
displayed with a blue screen in order to focus attention on the relevant part of the page.
When changing any setting in the HMI, please note that before the adjustment of a
parameter can take effect, it first needs to be validated and stored by pressing the "Set"
or “Change” button in the corresponding sub-section.
Figure 14 –Set button example

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Software version
Please note that this User Manual assumes that the firmware/software version being
used is at least:
Version 4.0 or above
And therefore, the HMI screen shots and some of the features described in this manual
reflect what is available in this latest version. Please refer to an older version of the User
Manual if there are discrepancies with what is described here.
Changing Passwords
Passwords can be changed for each username access level by:
-Logging in at the desired access level
-Going to the System / Product Info page
-Entering the current password for that access level
-Entering twice the new password that you want to set
-Pressing change
HMI: System / Product Info
Figure 15 –Changing password
Please take good note of any new password after your change.

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OPERATION/TIMING MONITORING
Introduction
The monitoring of the dynamic parameters during the operations of a circuit breaker
(operating time, speed etc.) allows for a diagnostic to be made of any mechanical issue
or significant drift in its speed of operation.
•Without a travel sensor installed in the CB (which represents the vast majority of
cases found in the field), auxiliary position contacts (52a and 52b) are used to
ascertain position and provide change of status timing.
•With a travel sensor installed (during the manufacturing of the CB as difficult to
retrofit afterwards), more precise position data becomes available without
relying on the auxiliary contacts. This unlocks additional functionalities.
Both options will be outlined although the first is, by far, the most common:
Functionalities available Without Travel Sensor
Number of operations
For each pole, the following information is recorded:
•date and time of the last opening and closing operation
•time elapsed since the corresponding previous close/open operation
•cumulative number of opening and closing operations performed
HMI: Measurements / Last opening results or Last closing results
Figure 16 –Number of opening/closing operation
Traditionally the mechanical counter in a CB only counts opening operations and there is
always a corresponding closing operation which is not counted. So it always counts a
pair of operations. The numbers of opening and closing operations recorded in the CBW3
match the mechanical counter and usually show the same value or are out by one.
The number of operations already performed when retrofitting a CBW3 can be entered in
the opening and closing operations counters during commissioning, to match the
mechanical counter present on the circuit breaker.

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HMI: Settings/Opening and Settings/Closing
Figure 17 –Initial setting of number of operations
An alarm can be set against both the number of opening and closing operations if they
exceed a set threshold. This can be used for maintenance purposes.
HMI: Settings/Opening and Settings/Closing
Figure 18 –Setting operation counter alarms
52a/52b 52a/52b contacts status
The 52a/52b auxiliary contacts are proximity switches that are there to reflect a direct
image of the circuit breaker position and indicate the status of the circuit breaker:
•52a aux. contact: is ON when circuit-breaker is CLOSED, and vice-versa
•52b aux. contact: is OFF when circuit breaker is CLOSED, and vice-versa
HMI: Measurements/Sensors
Figure 19 –Auxiliary contact status
In an IPO CB, if the 52a or 52b contacts do not show the same value for all 3 poles for
longer than the “pole discrepancy timeout” set, then a “Pole discrepancy” alarm is raised.
This alarm can serve as a reminder of a temporary phase imbalance in an IPO CB and
that the situation should not be maintained for a long time.
HMI: Settings/Operations Monitoring
Figure 20 –Pole discrepancy timeout threshold
In both a ganged and an IPO CB, if for any one pole, the 52a and 52b contacts have the
same value for longer than the “pole discrepancy timeout” set, then a “Pole discrepancy”
alarm is also raised. It can alert to the fact that there is a problem with the 52a and 52b
contacts for one pole and that the position of the CB for that pole might be incorrect.

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HMI: Measurements/Alarms
Figure 21 –Pole discrepancy alarm
Previous operation
The type of operation that was just performed is indicated as “previous operation type”.
This can be Open (O), Closed (C) or a combination operation (CO, OC, OCO).
During each operation, data acquisition is performed from all the sensors for a period
defined in the settings under « Acquisition duration »: 0.3s (300ms) is the default.
HMI: Settings/Operations monitoring
Figure 22 –Setting operation counter alarms
When a current flowing to the coil is detected, the system then samples every 0.4ms for
the acquisition duration, we get a total number of sample of 300 / 0.4 = 750. By analysing
the data from the 52a and 52b contact during this sampling period, we determine the
type of operation that has occurred using the following rules:
If the system sees a Closing operation first, it will check for another Opening operation
during the sampling time
If it does not see one, then it declares a simple Closing operation “C”
If it does see one, then it declares a Closing-Opening operations “CO”
If the system sees an “Opening” operation first, it will check for another Closing operation
during the sampling time
If it does not see one, then it declares a simple Opening operation “O”
If it does see one, then it continues to see if there might be a third operation
during the sampling period
If it does not see one, then it declares an Opening-Closing operation “OC”
If it does see one, then it declares an Opening-Closing-Opening operation
“OCO”
52a/52b contacts switching time
All timing starts from the detection of the open or close command (rising edge of the
current detected on the open or close coil circuit). The auxiliary contact switching time is
measured for each operation:

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HMI: Measurements/Last opening results or Last closing results
Figure 23 –Auxiliary contact timing
•Auxiliary contact 52a switching time: Time elapsed between open/close
command received and the 52a contact changing status
•Auxiliary contact 52b switching time: Time elapsed between open/close
command received and the 52b contact changing status
A graph is available showing the contact status change for each pole:
HMI: Measurements/Operations Charts/Opening and Closing
Figure 24 –Auxiliary contact opening and closing graphs
An “Aux contacts timeout” maximum threshold value can be entered during setup under.
HMI: Settings/Operations Monitoring
Figure 25 –Auxiliary contacts switching threshold
An alarm is raised if, after an operation request has been detected, the 52a/52b contacts
do not switch status before the auxiliary contact timeout threshold has been exceeded.
This could indicate a faulty contact or an inability for the CB to respond to an operation
command (“order rejection”).
HMI: Measurements/Alarms
Figure 26 –Monitoring the auxiliary contacts