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Alstom CBWatch3 User Manual

Circuit breaker monitoring
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CBWatch 3 User Manual
D1936 EN 04
D1620EN01 © ALSTOM 2012. All rights reserved. Information contained in this document is indicative only. No
representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project.
This will depend on the technical and commercial circumstances. It is provided without liability and is subject to change
without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
CBWatch3
Circuit Breaker Monitoring

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  • Page 1 D1936 EN 04 D1620EN01 © ALSTOM 2012. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project.
  • Page 2 CHANGE HISTORY Pierre CROZON Dominique LEGRAND §2.7 §3.7 §3.8 §5-1.3 § 6-7.2 § 6-7.4 Pierre CROZON Pierre CROZON First issue Pierre CROZON REV ESTABLISHED CHECKED APPROVED DATE MODIFICATIONS V4 – Nov 2016 2/90 D1936 EN04...

  • Page 3: Table Of Contents

    Grid Solutions Table of Contents Index of figures & pictures ........................7 Purpose of this document ........................10 Copyright .............................. 10 Safety instructions and warning ......................11 Handling electronic equipment Unpacking 11 Storage Set-up General overview ........................... 12 Introduction Product Description Application 1-3.1 Optimisation of corrective actions, following a failure:...
  • Page 4 Grid Solutions DO16 Module 2-7.1 Description 2-7.2 Allocation of terminals 2-7.3 Interface relay Common indicators on Input/Output modules 2-8.1 Description of LEDs Description of sensors ........................35 gas pressure and temperature sensor 3-1.1 Description 3-1.2 Technical characteristics of the sensor Open/close command detection sensor array 3-2.1 Description...
  • Page 5 3-11 Temperature sensor 3-11.1 Description 3-11.2 Technical characteristics of the sensor Human-Machine Interface (HMI) ....................49 TCP/IP Network card configuration Connection to the CBWatch3 CBWatch3 access level CBWatch3 network connection System Information Description of the monitoring functions ..................55 Gas Monitoring 5-1.1...
  • Page 6 Grid Solutions Contact Wear Monitoring 5-5.1 General Description 5-5.2 Sampling of the current before and during the interruption 5-5.3 Cumulative electrical wear 5-5.4 Alarm summary Stored Energy Motor Monitoring 5-6.1 General Description 5-6.2 Motor run time 5-6.3 Motor voltage 5-6.4 Motor current Spare Analogue Channels Monitoring 5-7.1...

  • Page 7: Index Of Figures & Pictures

    NDEX OF FIGURES PICTURES Figure 1 – Circuit-breaker and monitoring overview ..................12 Figure 2 – CBWatch3 minimum configuration dimension ................13 Figure 3 – CBWatch3 maximum configuration dimension ................13 Figure 4 – CBWatch3 composition ......................... 16 Figure 5 – CBWatch3 Power supply ........................ 17 Figure 6 –...
  • Page 8 Figure 49 – Network card configuration step 2 ....................50 Figure 50 – Network card configuration step 3 ....................51 Figure 51 – Connection to the CBWatch3 ...................... 52 Figure 52 – CBWatch3 log in .......................... 52 Figure 53 – CBWatch3 network connection ....................54 Figure 54 –...
  • Page 9 Grid Solutions Figure 89 – Speed of separation of the contacts .................... 76 Figure 90 – Monitoring of the final position ....................77 Figure 91 – Monitoring the bounces ....................... 77 Figure 92 – Travel during a CO cycle ......................78 Figure 93 –...

  • Page 10: Purpose Of This Document

    Grid Solutions URPOSE OF THIS DOCUMENT This document is the user manual. It provides readers with information on the CBWatch3 system, GE's solution for monitoring high-voltage circuit-breakers. This manual is intended to help users understand, install, use and maintain the CBWatch3.

  • Page 11: Safety Instructions And Warning

    Storage If you do not install the CBWatch3 as soon as it is received, store it in a place sheltered from dust and damp, in its original packaging. If the packaging box contains a desiccant packet, keep it in place.

  • Page 12: General Overview

    1-2 Product Description All of the sensors are connected to CBWatch3 supervision module. The interface for communication with the CBWatch3 is implemented through an Ethernet connection and a standard web browser. Figure 1 – Circuit-breaker and monitoring overview V4 –...
  • Page 13 Grid Solutions The CBWatch3 module is usually installed inside the circuit-breaker's low-voltage electrical control cabinet or in a separate enclosure installed next to it, mounted on 35 x 7.5 mm DIN rails. The various sensors are then installed on the circuit-breaker.

  • Page 14: Application

    Grid Solutions 1-3 Application The CBWatch3 constantly assesses the state of the circuit breaker. It signals remotely, and in real-time, any anomalies to the asset maintenance and/or supervision service. CBWatch3 can thus give advance warning of an impending issue and thus minimise the risk of “failure to operate”.

  • Page 15: Technical Specifications

    Tolerance: -30 % to +15 % Consumption: 30 VA maximum Reliability: High level of reliability and availability due to continuous self-monitoring of electronic modules and sensors. Standard: CBWatch3 is compliant with the recommendations of IEEE C37.10.1 V4 – Nov 2016 15/90 D1936EN04...

  • Page 16: Description Of Equipment

    Grid Solutions ESCRIPTION OF EQUIPMENT Note: All the modules described hereafter in this section may not be present in your CBWatch3 configuration ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ Figure 4 – CBWatch3 composition Power supply ProWatch Module DI16 Module...

  • Page 17: Power Supply

    18VDC potentiometer... 29.5 VDC LED "DC OK" LED "BOOST" Adapter for universal mounting rail UTA 107/30 Figure 5 – CBWatch3 Power supply Characteristics • Rapid triggering of standard protection circuit-breakers thanks to the new dynamic power reserve • Reliable starting of difficult loads thanks to the POWER BOOST static power reserve •...

  • Page 18: Potential Distributors

    2-2.1 Description In order to facilitate the supply of 24Vdc power to the various CBWatch3 sensors, we use potential distributors. These module allows to distribute a single 24Vdc power supply voltage potential input to many devices. We use two different colors to distinguish the plus and minus of the 24Vdc signal. Blue for -24Vdc and grey for +24Vdc.

  • Page 19: Prowatch Module

    Grid Solutions 2-3 ProWatch Module 2-3.1 Description of module Figure 7 – ProWatch module Bluetooth antenna (optional) Ethernet connector Earth connection Power supply terminals Modbus RS485 connector 2 programmable output contacts V4 – Nov 2016 19/90 D1936EN04...

  • Page 20: 2-3.2 Description Of Leds

    Grid Solutions 2-3.2 Description of LEDs LEDs States Operating Continuous Self-test control (Pro Watch) equals OK + GAS sensors present, green in accordance with the configuration (number of sensors, possibly none). Flash Green Starting Continuous Self-test OK but at least one GAS sensor not present (bad RS485 orange link, HS sensor,…) Continuous red...

  • Page 21: Description Of Modbus Rs485 Connector

    Grid Solutions 2-3.3 Description of Modbus RS485 connector The 3 serial ports are insulated up to 1.8kVrms (1min). The level of insulation is limited by the internal transformer, which provides the power to the insulated transmitters/receivers Terminal resistors of 120Ω may be activated (in the case of a long network) by short-circuiting two pins. The isolated 24 V DC power supply lines of the connector are used to power the pressure and temperature sensors.

  • Page 22: 2-3.5 K1 & K2 Programmable Output Contacts

    As standard, the ProWatch module includes 2x programmable relay alarm outputs (K1 & K2). • The K2 output is used to provide the state of the CBWatch3 following a regular system self-check. It can inform the maintenance service and/or supervision system of an internal malfunction.

  • Page 23: Di16 Module

    Grid Solutions 2-4 DI16 Module 2-4.1 Description This module provides 16x digital inputs and connects to the ProWatch module through the bus. It is used for the acquisition of all-or-nothing digital signals. The module is manufactured to sustain the environmental conditions. Base for bus Electronic module Power supply voltage connectors...

  • Page 24: 2-4.2 Allocation Of Terminals

    Grid Solutions 2-4.2 Allocation of terminals Terminal Colour Allocation a1, a2 24 V DC (UI) b1, b2 Blue 00 ... 07 Orange IN1 ... IN8 40 ... 47 Orange IN9 ... IN16 10 ... 17, 50 ... 57 24 V DC (US) 20 ...

  • Page 25: 2-4.3 Connections To Terminals

    Grid Solutions 2-4.3 Connections to terminals Terminal Connection Type See more details in IN01 52A Auxiliary Contact - Pole B True/False "Operation Timing" IN02 52B Auxiliary Contact - Pole B True/False "Operation Timing" IN03 Rewind Motor Contact - Pole B True/False "Stored Energy Motor Run Time"...

  • Page 26: Ai8 Module

    Grid Solutions 2-5 AI8 Module 2-5.1 Description This module provides 8x analogue inputs and connects to the ProWatch module through the bus. It enables acquisition of analogue voltage and amperage signals. The module is manufactured to sustain the environmental conditions. Base for bus Electronic module Power supply voltage connectors...

  • Page 27: 2-5.2 Allocation Of Terminals

    [Texte] 2-5.2 Allocation of terminals Terminal Colour Allocation a1, a2 24 V DC (UA) b1, b2 Blue 00 ... 07 Orange U1+ ... U8+ 10 ... 17 Orange U1- ... U8- 20 ... 27 Orange I1+ ... I8+ 30 ... 37 Orange I1- ...

  • Page 28: 2-5.3 Connections To Terminals

    Grid Solutions 2-5.3 Connections to terminals Module Terminal Connection Type See for more details IN00 DC Voltage - Supply 1 0-10V "DC Supply Measurement" IN01 DC Voltage - Supply 2 0-10V "DC Supply Measurement" IN02 Primary AC Current - Pole A +/-10V "Primary AC Current Measurement"...

  • Page 29: Rtd8 Module

    Grid Solutions 2-6 RTD8 Module 2-6.1 Description This module provides 8x temperature inputs and connects to the ProWatch module through the bus. It enables acquisition of signals from resistor temperature sensors. All common sensors made of platinum and nickel as per DIN EN 60751 and SAMA are handled, as well as the sensors CU10, CU50, CU53 and various types of KTY8x sensors.

  • Page 30: 2-6.2 Allocation Of Terminals

    [Texte] 2-6.2 Allocation of terminals Terminal Colour Allocation a1, a2 24 V DC (UA) b1, b2 Blue GND (UA) 00 ... 07 Orange U1+ ... U8+ 10 ... 17 Orange I1+ ... I8+ 20 ... 27 Orange I1- ... I8- 30 ...

  • Page 31: Do16 Module

    Grid Solutions 2-7 DO16 Module 2-7.1 Description This module provides 16x digital outputs and connects to the ProWatch module through the bus. It is used for the transmission of digital “all-or-nothing” signals. It provides 16 outputs to which you can assign one of the 16 configurable alarms via the HMI.

  • Page 32: Allocation Of Terminals

    Grid Solutions 2-7.2 Allocation of terminals Terminal Colour Allocation a1, a2 24 V DC (Uo) b1, b2 Blue 00 ... 07 Orange OUT1 ... OUT8 40 ... 47 Orange OUT9 ... OUT16 10 ... 17, 50 ... 57 Blue 20 ... 27, 60 ... 67 Blue 30 ...

  • Page 33: 2-7.3 Interface Relay

    2-7.3 Interface relay A CBWatch3 equipped with the DO16 module is complemented with external relays which can translate the alarm signals received from the DO16 module. 16 relays are available and take the form of 2x8 relay banks. Relays are connected to a PLC and each PLC can receive 8 relays. The PLC must be supplied with 24Vdc, usually from the CBWatch3 power supply.

  • Page 34: Common Indicators On Input/Output Modules

    Grid Solutions 2-8 Common indicators on Input/output modules 2-8.1 Description of LEDs The same LEDs are present on all the input/output modules and are located on the connectors. Figure 21 – Module LED description V4 – Nov 2016 34/90 D1936EN04...

  • Page 35: Description Of Sensors

    Grid Solutions ESCRIPTION OF SENSORS Note: All the sensors described hereafter may not be present in your specific CBWatch3 configuration 3-1 SF gas pressure and temperature sensor 3-1.1 Description These sensors are used for monitoring gas pressure and temperature and are of the digital type. They use an integrated microprocessor and communicate with the ProWatch module through digital signals (not analogue 4-20mA) using an extended proprietary Modbus protocol over an RS485 link.

  • Page 36: Open/Close Command Detection Sensor Array

    Grid Solutions 3-2 Open/close command detection sensor array 3-2.1 Description An open/close command on the control circuit is detected using this sensor array. The sensors detect a current rising edge on the coil in the control circuit. This detection is used to launch the operation data acquisition.

  • Page 37: Dc Current Measurement Sensor

    DC current flowing through all the open/close coils • measure the DC current used by the DC spring rewinding motor(s) The sensor connects to an AI8 module if present in the CBWatch3 configuration. Figure 26 – DC current sensor 3-3.1...

  • Page 38: Control Circuit Continuity

    Grid Solutions 3-4 Control Circuit Continuity 3-4.1 Description The TCW sensor connects itself in the DC control circuit and injects a small current in the control line (below the level needed to actuate the coil) in order to continually check the continuity of the circuit and to make sure that the coil is not open-circuit.

  • Page 39: Dc Voltage Measurement Sensor

    A voltage converter is used to provide a 0-10V signal image of the DC power supply voltage which can be received by an AI8 analogue input module if present in the CBWatch3 configuration. The primary range of the DC power supply voltage measured is 0 to 280Vdc.

  • Page 40: 3-5.1 Dc Voltage Measurement - Connection Principle

    Grid Solutions 3-5.1 DC Voltage Measurement - Connection principle The substation DC power is connected directly to the converter Figure 31 – DC Power connections V4 – Nov 2016 40/90 D1936EN04...

  • Page 41: Primary Current Measurement

    Grid Solutions 3-6 Primary current measurement To measure the primary current being interrupted by the circuit breaker, we rely on the circuit breaker’s own built-in primary current CT. There are two options used, depending on whether a split core CT is used or not. 3-6.1 Option 1 - Description A split-core CT is used to connect to the wires of the CB built-in CT, one per phase.

  • Page 42: 3-6.4 Option 2 - Description

    Then a current converter is used to convert the mA signal coming from the CT (+/- 100 mA) to a voltage signal (+/-10V) which can be received by an AI8 analogue input module if present in the CBWatch3 configuration. Figure 36 – Primary current closed CT converter The converter has 3 channels, so one converter can convert the primary current of all three phases.

  • Page 43: 3-6.5 Option 2 - Converter Connections

    Grid Solutions 3-6.5 Option 2 - Converter connections +100mA -100mA +100mA -100mA +100mA -100mA +10V -10V +10V -10V +10V -10V 3-6.6 Option 2 - Connection principle The primary interrupted current is acquired through 2 levels of CT which are then connected to the converter.

  • Page 44: Ac Current Measurement Sensor

    AC current into a 4-20 mA current proportional to the input. The AC wire is threaded through the red built-in CT on the picture below. The transducer connects to an AI8 module if present in the CBWatch3 configuration Figure 38 – AC current sensor 3-7.2...

  • Page 45: Ac Voltage Measurement Sensor

    A true RMS AC voltage transducer is used to convert sinusoidal AC voltage into a proportional 0-5V dc input. The transducer connects to one of the spare analogue inputs of the AI8 modules if present in the CBWatch3 configuration Figure 40 – AC voltage sensor 3-8.2...

  • Page 46: Pneumatic Pressure Sensor

    To do this, we use a pressure sensor that we plumb into the circuit using a T-piece. The sensor connects to one of the spare analogue inputs of the AI8 modules if present in the CBWatch3 configuration. Figure 42 – Pressure sensor 3-9.2...

  • Page 47: Travel Sensor

    60°. The output is a current between 4 to 20mA and it connects to the AI8 module if present in the configuration. Note: this sensor is typically never used on a retrofit CBWatch3 installation due to its invasive nature. Figure 44 – Travel sensor 3-10.2...

  • Page 48: Temperature Sensor

    They can also be used to measure ambient temperature. The PT100 sensors connect to the RTD8 temperature module if present in the CBWatch3 configuration. It is possible to connect up to 7 temperature sensors to the RTD8 module plus ambient temperature.

  • Page 49: Human-Machine Interface (Hmi)

    Grid Solutions (HMI) UMAN ACHINE NTERFACE The CBWatch 3 has an integrated Human-Machine Interface (HMI). Accessible from a web browser, it can access and display all parameters and measurements in CBWatch 3. 4-1 TCP/IP Network card configuration Open Network Connections by clicking the Start button , and then clicking Control Panel.
  • Page 50 Grid Solutions 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 49 – Network card configuration step 2 To specify IPv4 IP address settings, do one of the following: To get IP settings automatically using DHCP, click Obtain an IP address automatically, and then click OK.
  • Page 51 Then you should set the IP address and subnet mask. For example: If the CBWatch3 IP address is 192.168.5.22, the network card must be as below: Figure 50 – Network card configuration step 3 The last number 30 could be between 1 and 254 with the exception of 22.

  • Page 52: Connection To The Cbwatch3

    Grid Solutions 4-2 Connection to the CBWatch3 To be connected to the CBWatch3 you should use either an optical/RJ45 or optical/USB converter. Figure 51 – Connection to the CBWatch3 To log in to the CBWatch 3 HMI you need to launch any Internet browser (for example: “Google Chrome”...

  • Page 53: Cbwatch3 Access Level

    Grid Solutions 4-3 CBWatch3 access level Access to HMI data is limited according to the access level that the user has. The main increasing levels of access are listed below. Each next level has the rights of the preceding level plus those listed:...

  • Page 54: Cbwatch3 Network Connection

    Grid Solutions CBWatch3 network connection Here is an example of a network connection layout. It is possible to have one or several CBWAtch3 connected on the same substation Figure 53 – CBWatch3 network connection System Information Once you have access to the HMI of the CBWatch3, you can visualise the serial number and firmware...

  • Page 55: Description Of The Monitoring Functions

    Grid Solutions ESCRIPTION OF THE MONITORING FUNCTIONS Note: All the functions described hereafter in this section may not be available in your specific purchased CBWatch3 configuration, However, the following monitoring functions are described in the next section: Gas Monitoring Control Circuit Monitoring Operation Monitoring –...

  • Page 56: Sf 6 Gas Monitoring

    Grid Solutions 5-1 SF Gas Monitoring 5-1.1 General Description If the circuit breaker being monitored uses SF gas (or any other gas or gas mixture) to extinguish the arc, then the gas monitoring function can be setup for: - Number of gas tanks: 0 - no SF 1 - common tank for all 3 poles 3 - one gas tank per pole...
  • Page 57 Grid Solutions Figure 56– Thermodynamic law illustration It is possible to display the following gas information in the HMI: • Pressure: Raw absolute gas pressure measured from sensor • Temperature: Raw temperature measured from sensor • Density: Computed density from pressure and temperature values •...
  • Page 58 Grid Solutions Figure 57 – HMI – Gas monitoring bar Note 1: Because we need it to make density calculations and due to the nature of the sensor, the pressure value shown is the “absolute” value of the pressure inside the gas chamber. If there is a gauge on the system, the gauge might show a “gauge pressure”...

  • Page 59: 5-1.3 Threshold Alarms

    Grid Solutions On the HMI you can also display short term or long term curves for pressure, temperature and density: Figure 59 – HMI – Short and long term curves 5-1.3 Threshold alarms V4 – Nov 2016 59/90 D1936EN04...

  • Page 60: Long Term Trend Alarm Before L1

    Grid Solutions The gas density can be expressed in kg/m3 (gr/l) or in terms of equivalent absolute pressure at nominal 20°C and is compared with a certain number of thresholds. Each of these thresholds can be set by the user in terms of value and hysteresis by setting a decreasing pressure threshold (minimum) and an increasing pressure threshold (maximum) for each level.
  • Page 61 Grid Solutions For this long term trend calculations, the equivalent gas pressure at 20°C is recorded. The recordings are taken every night at midnight. This allows for consistent conditions and the removal of external influence parameters such as solar radiation. These recordings are used to carry out a linear extrapolation of the equivalent pressure at 20°C in the future.

  • Page 62: Short Term Trend Alarm Before L2

    Grid Solutions 5-1.5 Short term trend alarm before L2 While for long term trend, measurements at fixed regular intervals when external factors can be minimised are used. For the short term trend, the recordings are taken much more frequently and will therefore be sensitive to these external parameters.

  • Page 63: 5-1.8 Alarm Summary

    Grid Solutions 5-1.8 Alarm Summary The following user defined alarms can be raised by the system and their status visualised here: - 3x Threshold alarms - Liquefaction alarm - Short and long term trend alarms There are also system alarms associated with gas monitoring: - Sensor absence problem –...

  • Page 64: Control Circuit Monitoring

    5-2.4 Coil Integrity The CBWatch3 can measure the current passing through the coil(s) during an opening or closing operations. This is useful to measure the integrity of the coil. Any partial reduction in the number of turns present (reducing the ability of the coil to trip the latch) will change the impedance of the coil and will be detected through a resulting change of the current.
  • Page 65 Grid Solutions Figure 68 – Current through opening or closing coil Previous curves are stored and the user is also able to display a previous curve saved by the CBWatch3: Figure 69 – Drop-down list of previous archives The current information is also displayed in the HMI: Figure 70 –...

  • Page 66: Alarm Summary

    Grid Solutions Figure 71 – HMI – Coil current measurement settings Alarms can be set on: • Min coil charge (A x ms) when opening • Max coil charge (A x ms) when opening • Min coil charge (A x ms) when closing •...

  • Page 67: Operation Monitoring - Retrofit

    Grid Solutions 5-3 Operation Monitoring - Retrofit 5-3.1 General Description The monitoring of the dynamic parameters during the operations of a circuit breaker (operating time, speed etc.) allows for a diagnosis to be made of any possible drift in its mechanical integrity. - In the “Retrofit”...

  • Page 68: 5-3.4 Operating Times

    Grid Solutions 5-3.4 Operating times For each opening operation and for each of the poles, a recording is made of: - The date of the appearance of the command to open, - The time t1 between the appearance of the command on the opening coil and the moment where the circuit breaker leaves the “closed”...

  • Page 69: 5-3.5 Timing Alarms

    Grid Solutions Figure 78 – HMI – Last operation measurements 5-3.5 Timing alarms At each operation (opening or closing), the values of t1, t2 and t2-t1 are compared with the minimum and maximum allowed times that have been setup during the configuration. Figure 79 –...

  • Page 70: 5-3.6 Discordance Between Poles

    Grid Solutions 5-3.6 Discordance between poles When poles are opened simultaneously the opening and closing operation timing are compared for each pole and any differences are highlighted. There will always be small differences but if one phase experiences a delay greater than a threshold set by the user, than an alarm is raised so that the cause can be investigated.

  • Page 71: 5-3.7 Timing Compensation

    Grid Solutions 5-3.7 Timing compensation The operating time of a circuit breaker varies depending on: - the voltage made available to the coil (lower DC voltage will mean that the coil takes longer to energise to the required level) - the ambient temperature (greater friction in the mechanical movement at low temperature). These variations do not reflect any issue with the circuit breaker and therefore should be compensated for before triggering an alarm to avoid false alarms.
  • Page 72 Grid Solutions The operating time compensation for the control line voltage is a fixed rule and depends on the actual DC voltage being supplied to the coil. It required the presence of the DC voltage measurement sensor to provide the measured DC voltage information required. The coil voltage compensation is computed by shifting the thresholds based on the nominal voltage of the circuit and the coil voltage measured when the operation took place.

  • Page 73: 5-3.8 Operation Graphs

    Grid Solutions 5-3.8 Operation Graphs In the embedded web HMI, you can view the following operation graphs for each pole. The last 20 are stored and you can download them in COMTRADE format. Figure 84 – HMI – Operation graphs for opening V4 –...
  • Page 74 Grid Solutions In the embedded web HMI, you can view the following closing operation graphs, for each pole. The last 20 are stored and you can download them in COMTRADE format. Figure 85 – HMI – Operation charts for closing V4 –...

  • Page 75: Operation Monitoring - New Build

    Grid Solutions 5-4 Operation Monitoring – New build* *The presence of a travel sensor is required for all the following additional functionalities 5-4.1 General Description The monitoring of the dynamic parameters during the operations of a circuit breaker (operating time, speed etc.) allows for a diagnosis to be made of any possible drift in its mechanical integrity.

  • Page 76: 5-4.3 Contact Separation Speed

    Grid Solutions Figure 87 – Displacement sensor The compensation parameters are specific to each circuit breaker travel sensor and are entered in a table during setup: Figure 88 – Travel conversion table 5-4.3 Contact separation speed* During breaker opening, the speed at the moment of separation of the contacts is calculated. This speed is then compared to a minimum separation speed entered during setup.

  • Page 77: Bounces And The Final Position

    Grid Solutions 5-4.4 Bounces and the final position* Monitoring the final position For each opening or closing operation, limits are set for position of the travel sensor at the end of the operation. This is to ensure that the breaker has fully opened or closed. Figure 90 –...

  • Page 78: Travel During A Co Cycle

    Grid Solutions 5-4.5 Travel during a CO cycle* During a CO cycle (Close followed by Open), a check is made that the dimension reached at the end of the Close operation is sufficient. Figure 92 – Travel during a CO cycle 5-4.6 Auxiliary contact switches* The inputs for the travel sensors can be used to check the position at which the auxiliary contacts...
  • Page 79 Grid Solutions Figure 94 – HMI – Auxiliary contact timing • Auxiliary contact 52a switching time: Time duration between coil command and contact switching • Auxiliary contact 52b switching time: Time duration between coil command and contact switching V4 – Nov 2016 79/90 D1936EN04...

  • Page 80: Arcing

    Sampling of the current before and during the interruption The current flowing through the breaker is monitored for each pole using the breaker’s own primary current CTs which are connected through further CTs to the CBWatch3. Figure 95 – Current before and during interruption During the first 20 milliseconds following the command to the coil, the minimum and maximum peak current values (Imin and Imax) are determined.

  • Page 81: 5-5.3 Cumulative Electrical Wear

    Grid Solutions This RMS interrupted current value for each pole is both stored and displayed in the HMI: Figure 96 – Interrupted current value We can determine the instant of the separation of the contacts (Ts): In cases where a travel sensor is available, detection can be made of the instant at which the dimension for separation of the contacts is reached.

  • Page 82: 5-5.4 Alarm Summary

    Grid Solutions 5-5.4 Alarm summary In order to receive a warning when we are approaching the time when contacts need to be replaced due to wear, a comparison is made between the cumulative electrical wear and the maximum value specified by the manufacturer for the arcing contacts used. Two alarm thresholds can be set for the electrical wear.

  • Page 83: Stored Energy Motor Monitoring

    But it can also take the form of a pneumatic/hydraulic piston where the pressure is built-up by an electric pump motor. The CBWatch3 attempts to cover most possibilities, whether there is one motor for all 3 poles or one motor per pole.

  • Page 84: 5-6.4 Motor Current

    Grid Solutions 5-6.4 Motor current The CBWatch3 is able to measure the current used by the rearming motor/pump in order to notice any changes, possibly highlighting additional friction requiring more torque or a problem with the motor itself. The motor current curve is displayed on the HMI and stored: HMI CBWatch 3: Measurement / Operations charts / spring Figure 101 –...
  • Page 85 Grid Solutions An alarm can be set on the maximum inrush current for the motor. Max threshold: inrush current value above which an alarm will be generated: Figure 104 – HMI – Motor current alarm setting During the commissioning, a real-time measurement can be performed to set the threshold. V4 –...

  • Page 86: Spare Analogue Channels Monitoring

    Grid Solutions 5-7 Spare Analogue Channels Monitoring 5-7.1 General Description Depending on the configuration, there may be up to 4 spare analogue channels that can be assigned to measure and monitor other values as per customer requirements. The name and the measurement units of the measured value can be specified by the user. The signal type can be either: 0-10V;...

  • Page 87: Temperature Monitoring

    The CBWatch3 prefers instead to monitor that the end result, keeping the correct temperature, is achieved or that the temperature is starting to drift.

  • Page 88: Monitoring

    Two relay alarms, K1 and K2, are provided as standard on the base ProWatch module: The K2 output is used to provide the state of the CBWatch3 as a self-control function. It can inform the maintenance service and/or supervision system of an internal malfunction.
  • Page 89 Grid Solutions Figure 110 – HMI – Gas alarm settings All the other alarms can be assigned in the same way to one of the 16 relays or K1: Figure 111 – HMI – Operation alarms V4 – Nov 2016 89/90 D1936EN04...
  • Page 90 Grid Solutions OMMUNICATION 6-1 Protocols Depending on the configuration of your system, one or several communication protocols may be available from: • Modbus • DNP3 • IEC 61850 Please refer to the documentation of that protocol for further information. V4 – Nov 2016 90/90 D1936EN04...

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