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GE Kelman DGA900, Operator'S Manual

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GE Kelman DGA900 Operator'S Manual Download Page 7

 

MA-025 

–

 DGA 900 Operator Guide 

–

 Rev 2.0 

12-Apr-19 

Page 7 of 92 

1

 

INTRODUCTION 

1.1

 

Product Overview 

The Kelman

™ 

DGA 900 (the product) is a multigas online DGA (Dissolved Gas Analysis) and 

moisture monitoring system for implementing Asset Performance Management (APM) 
across electrical generation, transmission, distribution and industrial applications. 

The product as shown in Figure 1-1 can detect and diagnose incipient faults and trend 
asset health via the monitoring of critical gases including moisture in the transformer oil. 
This includes any mineral oil or ester-based fluid (natural or synthetic). The product 
measures nine certified fault gases: 

hydrogen

, 

methane

, 

ethane

, 

ethylene

, 

carbon

 

monoxide

, 

carbon

 

dioxide

, 

acetylene

, 

oxygen

, 

nitrogen

 as well as water content and the 

transformer load current. Such data provides insight on transformer condition criteria, 
such as developing faults, paper degradation and electrical arcing. 

Once installed, operation is intuitive and programmable. The product can be managed 
remotely over a network via a web-based interface or locally via a touchscreen interface. 
All results are stored within the product, but 

online management is recommended

. Results 

and the full product database can also be downloaded to a PC for analysis, aggregation and 
trending with the Perception software suite. 

 

Figure 1-1: Inside the DGA 900 

The product features: 

▪

 

An innovative two-enclosure design connecting the two modules by a Power, 
Communications and Control (PCC) cable for a more flexible installation configuration. 
The Analysis module contains the PGA measurement technology, whereas the Hub 
module contains the communications technology and HMI screen. The modules have 
IP56-rated aluminium enclosures (compliant in the installed upright position) and are 
powder coated to the RAL 9002 colour. 

▪

 

Automated headspace gas extraction manifold to extract target gases from the oil 
sample. 

Summary of Contents for Kelman DGA900

Page 1: ...MA 025 DGA 900 Operator Guide Rev 2 0 12 Apr 19 Page 1 of 92 GE Grid Solutions Kelman DGA 900 Operator Guide Transformer Oil Dissolved Gas and Moisture Monitor ...

Page 2: ...ms 23 6 6 2 Measurements 23 6 6 3 Duval Triangle 24 6 6 4 Gas Ratio 25 6 6 5 Scheduler 26 6 7 Calculations 26 6 7 1 Gas Ratios 26 6 7 2 Relative Saturation 27 6 7 3 Gas Rate of Change 27 6 7 4 Analog Inputs RoC Configuration 28 6 8 Alarms 29 6 8 1 Gases 29 6 8 2 Gas Ratios 30 6 8 3 Gas Rate of Change 31 6 8 4 Relative Saturation 32 6 8 5 Analog Inputs 32 6 8 6 Analog Inputs Rate of Change 33 6 8 7...

Page 3: ...f Change Alarms 52 6 12 5 Channels 53 6 12 6 Settings 53 6 13 Logout 54 6 14 Shutdown Procedure 55 6 15 Error Notifications 56 6 15 1 Error Codes 58 6 15 2 Other Notifications 59 7 Manual Oil Sampling 60 7 1 Sampling Arrangement 60 7 2 Local HMI for manual sampling 61 7 3 Sampling Process 65 8 Communications 67 8 1 DNP3 67 8 2 IEC 61850 67 8 3 Modbus Protocol 67 8 4 HTTP HTTPS Protocol 67 9 Techni...

Page 4: ...nfiguration 29 Figure 6 19 Hydrogen alerts 30 Figure 6 20 Gas Ratio Alarms Configuration 30 Figure 6 21 Gas Ratio Alarms Configuration Ratio 1 High High Gas Rate of Change 30 Figure 6 22 Gas RoC Configuration 31 Figure 6 23 Relative Saturation Alarms Configuration 32 Figure 6 24 Relative Saturation Alarms Configuration High High 32 Figure 6 25 Analog Inputs Alarms Configuration 32 Figure 6 26 Anal...

Page 5: ... Figure 65 MicroSD card memory usage 59 Figure 7 1 Oil filter and oil ports front view of Analysis module 60 Figure 7 2 Valve orientation 61 Figure 7 3 Sampling assembly 61 Figure 7 4 Luer fitting on assembly 61 Figure 7 5 Local HMI Quick Access 61 Figure 7 6 Manual Sampling 62 Figure 7 7 Purging Oil 62 Figure 7 8 Take manual oil sample 63 Figure 7 9 Manual Sampling cannot be started 63 Figure 7 1...

Page 6: ...2 Figure C 12 Oil filter 82 Figure C 13 Internal push fit cover removal 82 Figure C 14 Peltier cooler 84 Figure C 15 Fan group electrical connection 84 Figure C 16 Peltier cooling fins 84 Figure C 17 Fan group detached from cooler 84 Table D 1 Timing 85 Table D 2 UNIX time registers 85 Table D 3 Access flags 86 Table D 4 Modifier flags 86 Table E 1 Main Tank Gas Level Alarms 88 Table E 2 ROC alarm...

Page 7: ... criteria such as developing faults paper degradation and electrical arcing Once installed operation is intuitive and programmable The product can be managed remotely over a network via a web based interface or locally via a touchscreen interface All results are stored within the product but online management is recommended Results and the full product database can also be downloaded to a PC for a...

Page 8: ...A configurable analogue input cards Three digital inputs optional configurations available Compatible with AC or DC power Four sunlight visible LED arrays on the exterior of the Hub module red for alarm yellow for caution both user configurable and green for power blue for service A fully embedded microprocessor with 4 GB non volatile internal memory storage highly scalable analogue and digital I ...

Page 9: ...el LED lights LED Colour Symbol Meaning Alarm A measured parameter has exceeded a user programmed alarm threshold Caution A measured parameter has exceeded a user programmed warning threshold Power 24 V Power OK Service Service required Triggered by a warning service event if the product detects internal issues or if equipment settings are exceeded If scheduled the product will still attempt anoth...

Page 10: ...r serious injury and or significant equipment damage Caution A procedure practice or condition could cause minor injury equipment damage or loss of data Electrical Hazard Risk of electric shock Hot surfaces may be present 2 2 Warnings The following warnings must be observed WARNING The minimum ambient temperature for installation and service activities is 10 C WARNING If the equipment is installed...

Page 11: ...der normal use The door shall be kept locked and should only be opened for service access by suitably qualified and authorised service personnel During service access hazardous voltages are accessible WARNING Only GE trained and certified personnel may commission GE Kelman products Commissioning tasks include making any connections and or performing any work within the enclosure or performing task...

Page 12: ...3 5 3 Measurement frequency Variable Once per hour to once every 4 weeks ENVIRONMENTAL 11 Operating external temperature range 40 C to 55 C Storage temperature range 0 C to 45 C Oil temperature range 6 20 C to 120 C Altitude Up to 2000 m Atmospheric pressure Up to 1050 mbar Operating humidity 10 95 RH non condensing Enclosure IP56 Weight 7 Analysis module 33 4 kg 73 6 lb Hub module 18 5 kg 40 8 lb...

Page 13: ... Low oil viscosity reduces oil flow 7 Note The weight depends on the order specification The stated weight is for a base product without packaging and excludes options such as a mounting stand Check the shipping document for the exact packaged weight 8 Note Maximum DC breaking capacity for a resistive load 9 Note Use only the approved and recommended fuse to ensure continued fire protection and co...

Page 14: ...c Discharge EN 61000 4 3 III Electromagnetic Field Immunity EN 61000 4 4 III Electrical Fast Transients EN 61000 4 5 III Surge Immunity EN 61000 4 6 III Conducted RF Immunity EN 61000 4 8 IV V Magnetic Field Immunity EN 61000 4 11 III Voltage Dips Interruptions IEC 61000 4 12 2 5 kV 1 kV Oscillatory Wave IEC 61000 4 16 A Mains frequency voltage EN 60255 5 5 kV 2 kV 500 V DC Impulse Dielectric Insu...

Page 15: ...cated towards the bottom right hand side of the Hub module Figure 5 1 Fuse holder The product uses four external sunlight visible LEDs on the front door Each LED has two states Off or On as outlined in Table 5 1 Table 5 1 External LED status indicators Mode Alarm red LED Caution amber LED Power green LED Service blue LED Power Off Normal On Alarm On On Caution On On Service On On Fuse holder Live ...

Page 16: ...rectly with the product onsite without additional equipment However the local HMI facility is intended as an alternative or secondary access method in situations where network connectivity is unavailable To prevent exposure of the internal equipment to extreme weather or other adverse environmental conditions ensure additional cover is in place prior to opening the door The LCD panel is in the Hub...

Page 17: ... feel but some features are dependent on the type of user Note If there are any rendering issues on the remote HMI press Ctrl F5 to refresh Note If using Internet Explorer 11 ensure that the option for Compatibility View is disabled 6 2 Connections The remote HMI can also be accessed from a laptop via a direct physical connection to the product The product ships with the default IP address as show...

Page 18: ...ver View information only includes downloading if using the remote HMI Operator View information and make configuration changes Administrator View information make configuration changes and perform user administration e g change passwords Note The session inactivity timeout is 10 minutes The Administrator can omit to set a password for the Observer role This means anyone with physical access to th...

Page 19: ... Section 7 2 6 5 Dashboard After a successful login the remote HMI displays the Dashboard page in Normal Mode as shown in Figure 6 5 The Dashboard page displays details of the Last DGA measurement a Quick Access panel System Information and a trend chart below Note The dashboard can be toggled between Normal Mode and Rapid Mode See Section 6 5 1 3 ...

Page 20: ...ed an alarm the reading has exceeded the High High level Rest the pointer on any gas to obtain the full name in a tooltip After the next measurement completes the details automatically update The System Info gives the current date time product state scheduler mode Normal Alarm Caution and next scheduled measurement Indicators show the status of the alarm caution and service LEDs as well as the six...

Page 21: ...f the plotted gas on or off 6 5 1 Quick Access The Quick Access panel in the centre of the HMI as shown in Figure 6 6 offers additional functionality Note Some features are disabled as they are still in development Figure 6 6 Quick Access The following Quick Access features are available 6 5 1 1 Diagnostics Click Diagnostics to access the Duval Triangle or Gas Ratio diagnostics 6 5 1 2 Download Lo...

Page 22: ...ct alarms relays or calculations Click Enter Rapid Mode to access the rapid mode options The Quick Access panel displays the available options as shown in Figure 6 7 Figure 6 7 Quick Access Rapid Mode 6 5 1 3 1 Start 1x Rapid Mode To start a single rapid mode measurement click Start 1x Rapid Mode 6 5 1 3 2 Start 4x Rapid Mode To start four rapid mode measurements in succession click Start 4x Rapid...

Page 23: ...fied in the units relating to what is measured E g PPM for gas degrees Celsius C for temperature See Section 6 8 for a definition of deadbands 6 6 2 Measurements Select GAS Diagnostics Measurements to open the Measurements page as shown in Figure 6 9 The Measurements page reports the values of all variables from a measurement cycle The most recent measurement cycle is listed first Use the scroll b...

Page 24: ...MA 025 DGA 900 Operator Guide Rev 2 0 12 Apr 19 Page 24 of 92 Figure 6 9 Measurements 6 6 3 Duval Triangle Select GAS Diagnostics Duval to open the Duval Diagnostic page as shown in Figure 6 10 ...

Page 25: ...5 DGA 900 Operator Guide Rev 2 0 12 Apr 19 Page 25 of 92 Figure 6 10 Duval Diagnostic 6 6 4 Gas Ratio Select GAS Diagnostics Gas Ratio to open the Gas Ratio page as shown in Figure 6 11 Figure 6 11 Gas Ratio ...

Page 26: ...se this page to schedule a DGA measurement cycle Figure 6 12 DGA Scheduler 6 7 Calculations 6 7 1 Gas Ratios Select Calculations Gas Ratios to open the Gas Ratio Settings page as shown in Figure 6 13 Figure 6 13 Gas Ratio Settings Choose the relevant icon to expand the ratio definition as shown in Figure 6 14 Figure 6 14 Gas Ratio Settings Ratio 1 definition ...

Page 27: ...0599 standards for alarm settings or Appendix E 6 7 2 Relative Saturation Select Calculations Relative Saturation to open the Relative Saturation settings page as shown in Figure 6 15 Figure 6 15 Relative Saturation Settings 6 7 3 Gas Rate of Change Select Calculations Gas Rate of Change to open the Gas RoC Configuration page as shown in Figure 6 16 See Appendix E for more details on settings Figu...

Page 28: ...on Select Calculations Analog Inputs Rate of Change to open the Analog Inputs RoC Configuration page as shown in Figure 6 17 The default is for a CT to be installed on Analogue Input 1 The product supports up to five additional analogue inputs Figure 6 17 Analog Inputs Rate of Change Configuration ...

Page 29: ... 3 will remain in the alarm state until the value falls below 197 ppm Note Deadbands are specified in the units being measured Gases are specified in PPM temperature in degrees Celsius The host network must have the capability to transmit alarms and critical messages during times of heavy use including but not limited to network storm conditions If this requirement is not met or has not been teste...

Page 30: ... 6 8 2 Gas Ratios Select Alarms Gas Ratios to open the Gas Ratio Alarms Configuration page as shown in Figure 6 20 Figure 6 20 Gas Ratio Alarms Configuration Click the relevant ratio icon e g D1 and R1 High High to expand the ratio alarm definition and configure the type of alerts as shown in Figure 6 21 Figure 6 21 Gas Ratio Alarms Configuration Ratio 1 High High Gas Rate of Change ...

Page 31: ...DGA 900 Operator Guide Rev 2 0 12 Apr 19 Page 31 of 92 6 8 3 Gas Rate of Change Select Alarms Gas Rate of Change to open the Gas RoC Configuration page as shown in Figure 6 22 Figure 6 22 Gas RoC Configuration ...

Page 32: ...Figure 6 23 Relative Saturation Alarms Configuration Click on a Relative Saturation icon e g High High to expand the relative saturation definition as shown in Figure 6 24 Figure 6 24 Relative Saturation Alarms Configuration High High 6 8 5 Analog Inputs Select Alarms Analog Inputs to open the Analog Inputs Alarms Configuration page as shown in Figure 6 25 Figure 6 25 Analog Inputs Alarms Configur...

Page 33: ...ts Rate of Change to open the Analog Inputs RoC Alarms Configuration page as shown in Figure 6 26 Figure 6 26 Analog Inputs RoC Alarms Configuration 6 8 7 Digital Inputs Select Alarms Digital Inputs to open the Digital Inputs Alarms Configuration page as shown in Figure 6 27 Figure 6 27 Digital Inputs Alarms Configuration ...

Page 34: ...e 34 of 92 6 8 8 Digital Inputs Transition Total Select Alarms Digital Inputs Transition Total to open the Digital Inputs Transition Total Alarms Configuration page as shown in Figure 6 28 Figure 6 28 Digital Inputs Transition Total Alarms Configuration ...

Page 35: ... The Peripheral Scheduler allows the Measurement Time Interval to be set to 5 10 15 or 20 minutes 6 9 2 Analog Inputs Select Peripherals Analog Inputs to open the Analog Inputs Configuration page as shown in Figure 6 30 Figure 6 30 Analog Inputs Configuration If there are analogue cards fitted to the I O PCB these will auto populate with default values as shown in Figure 6 31 The next step is to c...

Page 36: ...6 9 3 Digital Inputs Select Peripherals Digital Inputs to open the Digital Input Configuration page as shown in Figure 6 32 Figure 6 32 Digital Input Configuration 6 9 4 Input Measurements Select Peripherals Input Measurements to open the Input Measurements page as shown in Figure 6 33 Figure 6 33 Input Measurements ...

Page 37: ...ettings Communications to open the Communications Settings page as shown in Figure 6 34 Figure 6 34 Communications Settings If a GPRS modem is fitted and the appropriate carrier sim is installed the IP address also displays See Appendix A 2 for more details on the external interfaces and supported protocols ...

Page 38: ...to open the Date Time page as shown in Figure 6 35 Figure 6 35 Date Time 6 10 3 SMS Alerting Select Settings SMS Alerting to open the SMS Alerting page as shown in Figure 6 36 In this example the system is configured to send Richard an SMS message whenever a System Error is raised Figure 6 36 SMS Alerting ...

Page 39: ...tings page as shown in Figure 6 37 Rules can be added edited or deleted to create a suitable access policy for each type of interface These rules are used to block unused ports and specify distinct firewall actions accept reject or drop based on the IP address or port Figure 6 37 Firewall configuration See Appendix A 4 for more details on firewall configuration ...

Page 40: ...ew certificate to replace the GE self signed certificate and enable HTTPS requests only A certificate can be uploaded from a USB drive In the Upload certificate field click the Select file button select the new certificate PEM file and click Open Click the Save button in the application header to apply the changes and then restart the DGA 900 Note SSL certificates are small data files that digital...

Page 41: ...ble Nitrogen Enabled displays measurement data for nitrogen This also activates the display of Total Dissolved Gases TDG disabled by default TDG Enabled lists the Total Dissolved Gases TDG Inactive if nitrogen measurement is not enabled TDG H2 CO2 CO C2H4 C2H6 CH4 C2H2 O2 N2 TDH Enabled lists the Total Dissolved Hydrocarbons TDH TDH CH4 C2H2 C2H4 C2H6 Estimated Safe Handling Limit ESHL expresses t...

Page 42: ...e as shown in Figure 6 40 Figure 6 40 Controller Reprogramming Drag and drop the firmware file into the circle or click in the circle to select the file Click Upgrade and the status information and a progress bar display as shown in Figure 6 41 Figure 6 41 Upgrade in progress Once complete the firmware image is applied and the system restarts On initial power up the product s LCD screen remains bl...

Page 43: ...g page as shown in Figure 6 42 Figure 6 42 I O Board Reprogramming Drag and drop the firmware file into the circle or click in the circle to select the file Click Upgrade and the status information and a progress bar displays as shown in Figure 6 43 Figure 6 43 Upgrade in progress Once complete the firmware image is applied and the system restarts On initial power up the product s LCD screen remai...

Page 44: ...MA 025 DGA 900 Operator Guide Rev 2 0 12 Apr 19 Page 44 of 92 6 11 4 Oxygen Sensor Select Service Oxygen Sensor to open the Oxygen Sensor settings page as shown in Figure 6 44 Figure 6 44 Oxygen Sensor ...

Page 45: ...rmalization Select Service Gas Normalization to open the Gas Normalization Settings page as shown in Figure 6 45 Figure 6 45 Gas Normalization Settings 6 11 6 Factory Select Service Factory to open the Factory Settings page as shown in Figure 6 46 Figure 6 46 Factory Settings ...

Page 46: ...effect This signifies to an operator or control room in real time that multiple sources have triggered the same relay Note This ensures that further alarms raised by the same source have no further effect 6 11 6 2 Clear Historical Data Only Clears all historical data DGA measurements alarm data and Transopto measurements Table 6 2 outlines the type of data items that get erased 6 11 6 3 Reset Conf...

Page 47: ...Gas RoC Transopto RoC Analog Input RoC Alarms Alarms Peripherals Transopto Channels Transopto Measurements Analog Inputs Digital Inputs Settings Communications Service Measurement Oxygen Sensor Transopto Gas Normalization Factory 6 11 6 5 Simulation Mode The dashboard environment can be switched to Simulation Mode to simulate a realistic live environment before the product is physically installed ...

Page 48: ...ement cycles 6 11 6 6 Restart Device Some configuration changes require a device restart Click Restart Device to restart the device and then click Restart to confirm as shown in Figure 6 48 Figure 6 48 Restart the device 6 11 7 User Administration Select Service User Administration to open the User Administration page as shown in Figure 6 49 Figure 6 49 User Administration Click Change Password to...

Page 49: ...Rating Description Not enough No password entered Weak 4 characters or more Medium 7 characters or more The string must contain at least one each of the following characters lowercase alphabetical uppercase alphabetical and numeric Strong 8 characters or more The string must contain at least one each of the following characters lowercase alphabetical uppercase alphabetical numeric and special ...

Page 50: ...nts Select TransOpto Measurements to open the TransOpto Measurements page as shown in Figure 6 51 Figure 6 51 TransOpto Measurements 6 12 2 Rate of Change Select TransOpto Rate of Change to open the TransOpto RoC Configuration page as shown in Figure 6 52 Figure 6 52 TransOpto RoC Configuration ...

Page 51: ...Select TransOpto Alarms to open the TransOpto Alarms Configuration page as shown in Figure 6 53 Figure 6 53 TransOpto Alarms Configuration Click on a channel alarm icon e g Channel 1 High to configure the type of alerts as shown in Figure 6 54 Figure 6 54 Channel 1 High alerts ...

Page 52: ...ansOpto Rate of Change Alarms to open the TransOpto RoC Alarms Configuration page as shown in Figure 6 55 Figure 6 55 TransOpto RoC Alarms Configuration Click on a channel alarm icon e g Channel 2 High High to configure the type of alerts as shown in Figure 6 56 Figure 6 56 Channel 2 High High alerts ...

Page 53: ...nnels Select TransOpto Channels to open the TransOpto Channels Settings page as shown in Figure 6 57 Figure 6 57 TransOpto Channels Settings 6 12 6 Settings Select TransOpto Settings to open the TransOpto Settings page as shown in Figure 6 58 Figure 6 58 TransOpto Settings ...

Page 54: ...perator Guide Rev 2 0 12 Apr 19 Page 54 of 92 6 13 Logout Select the Logout option below the username as shown in Figure 6 59 Figure 6 59 Logout The Log in page displays as shown in Figure 6 60 Figure 6 60 Log in page ...

Page 55: ... 6 62 then Either wait for the product to finish the active measurement or manually stop the measurement For the latter choose Stop Measurement as shown in Figure 7 10 The DGA 900 state changes to Oil Draining This process may take several minutes after which the product state returns to Standby as shown in Figure 6 61 Turn the external switch or circuit breaker to the Off position Turn the transf...

Page 56: ...using a sequence of double digit codes for the PGA and the Oxygen sensor if enabled The PGA Error State denotes the most recent state within the measurement cycle where the error occurred All errors are listed as error codes and the associated hexadecimal in brackets allows the most recent state to be identified See Section 6 15 1 for a definition of the error codes Note The Customer Service Centr...

Page 57: ...MA 025 DGA 900 Operator Guide Rev 2 0 12 Apr 19 Page 57 of 92 Figure 6 64 PGA Errors Note If the Oxygen sensor is not enabled no Oxygen sensor state or error codes display ...

Page 58: ...Microphone test failed 07 Not level sensor 1 pulses level 08 Not level sensor 3 drain 09 Fill level shows Oil 10 Over Fill shows Oil 11 PGA Air temperature outside limits 12 Bad communication with control PCB 13 Gas leak test Pump pressure too low 14 Gas leak test Pressure decay too high 15 Unusual ambient gas measurements 16 Oil temperature too low 17 Oil temperature too high 18 Oil pressure too ...

Page 59: ...rature reading fails due to a communication error 10 Oxygen sensor Oil temperature writing fails due to a communication error 11 Oxygen sensor Dissolved Oxygen DO Trigger command writing fails due to a communication error 12 Oxygen sensor Status DO_DATA_RDY is not set 13 Oxygen sensor DO Error Code reading fails due to a communication error 14 Oxygen sensor Oxygen reading fails due to a communicat...

Page 60: ...e body protector fitting as shown in Figure 7 1 The product ensures that there is fresh oil at the sampling point when the sampling process takes place Figure 7 1 Oil filter and oil ports front view of Analysis module A male quick connect fitting and valve assembly is provided in the product installation kit GE also recommends the use of a 50 mL ground glass syringe Note The manual oil sampling ar...

Page 61: ... The manual sampling functionality is implemented on the Quick Access page of the local HMI only as shown in Figure 7 5 Press Manual Sampling Note Before proceeding ensure that the sampling assembly is fitted as outlined in Section 7 1 Figure 7 5 Local HMI Quick Access CLOSED Oil sampling valve assembly with Luer fitting OPEN Quick connect body protector with pull down collar for release ...

Page 62: ...The Manual Sampling page displays Press Start as shown in Figure 7 6 to start the manual sampling process Figure 7 6 Manual Sampling The oil purging process starts Allow several minutes for the oil to purge and then press Continue when done Figure 7 7 Purging Oil ...

Page 63: ... 3 for more details on the sampling process Press Finish to return to the home page as shown in Figure 7 8 Figure 7 8 Take manual oil sample If the product is already performing a measurement manual sampling is prevented as shown in Figure 7 9 Press Exit to return to the Quick Access page Figure 7 9 Manual Sampling cannot be started ...

Page 64: ... the current measurement cycle to finish or stop the current measurement cycle To stop the current measurement cycle return to the Dashboard and press Stop Measurement as shown in Figure 7 10 Figure 7 10 Dashboard Stop Measurement The product is now ready to take a manual sample ...

Page 65: ...ocess to obtain a manual oil sample Figure 7 11 Manual oil sampling flowchart Close sampling valve Remove male fitting and valve assembly Replace quick connect body protector Standby state Measurement state Press Stop Measurement Oil Drains Standby state Attach male fitting and valve assembly with valve closed Press Manual Sampling Start Wait at least several minutes for oil to purge Press Continu...

Page 66: ...ocess starts The product state reads Oil purging To ensure accurate results oil must be adequately purged before sampling begins This brings fresh oil from the transformer to the manual oil sampling port Typically this means waiting approximately 5 10 minutes but the recommended wait time can vary depending on the installation longer tubing and lower temperatures can increase the purge duration Co...

Page 67: ...he HTTP and HTTPS protocols are used for communication with the Perception software suite The login credentials for such communication are independent of the local and remote HMI The login credentials to communicate with Perception from the DGA 900 are as follows Username perception Password perception Refer to the Perception software documentation v 1 22 3 or later for further details 9 TECHNICAL...

Page 68: ...If a device is being used in a manner that does not require wide area network access it is strongly recommended that the device not be connected to any wide area network to reduce the attack surface Harden system configurations by enabling using the available security features and by disabling unnecessary ports services functionality and network file shares Apply all the latest GE product security...

Page 69: ... configured and deployed network security devices e g firewalls routers to block every protocol whether disabled or not that doesn t need to pass from one network segment to another GE recommends limiting the protocols allowed by the network infrastructure to the minimum set required for the intended application Successfully doing this requires knowing which protocol is needed for each system leve...

Page 70: ... specified on this page apply to all interfaces Ethernet USB and GSM GPRS modem Figure A 2 Communication Services Select the relevant slider button to enable disable the relevant communication service E g Modbus TCP SSH Secure Shell and HTTPS do not rely on the firewall settings To implement a custom security policy upload a new certificate to replace the GE self signed certificate and enable HTTP...

Page 71: ... 900 A 3 2 Enable disable SSH service root access over SSH Use the HMI to login as either Administrator or Operator Select Settings Communication Services Select the SSH Enable slider button to enable disable the Secure Socket Shell service Click the Save button in the application header to apply the changes Restart the DGA 900 A 3 3 Enable disable HTTPS protocol Use the HMI to login as either Adm...

Page 72: ...he DGA 900 ships with a standard GE self signed certificate with the firewall enabled by default to accept all HTTP requests You should customise the firewall To create a custom security policy select Settings Firewall to open the Firewall Settings page as shown in Figure A 3 Figure A 3 Firewall Settings Rules can be added edited or deleted to create a suitable access policy for each type of inter...

Page 73: ...ll Connections on a dedicated interface In the Firewall Settings page select the interface type e g lan and in the Default policy dropdown select REJECT as shown in Figure A 6 Figure A 6 LAN interface A 4 4 Disable all Connections except HTTPS In the Firewall Settings page select the interface type e g lan and in the Default policy dropdown select REJECT as shown in Figure A 7 Figure A 7 LAN inter...

Page 74: ... address e g 192 168 0 124 In the Port field select the Port checkbox and type 443 In the Firewall Action dropdown list select ACCEPT Repeat the above steps for each interface type to ensure that only HTTPS requests are permitted on those interfaces e g usb and gsm After all interfaces have been configured click the Save button in the application header to save the security settings and then resta...

Page 75: ...d horizontally If the product is to be relocated or transported it must be shutdown using the procedure outlined in Section 6 14 Note If the product is to be removed from the transformer ensure that the transformer inlet and outlet valves and the pipework valves are closed before removing the pipework To access the lock open the Analysis module remove the black push fit insulating cover as describ...

Page 76: ...tion mounts as shown in Figure B 4 Figure B 4 PGA lock remove plastic nuts Remove the metal bracket as shown in Figure B 5 Note Retain the metal bracket pins and plastic nuts for future use of the lock Figure B 5 PGA lock remove metal bracket The transportation PGA lock is now disengaged rendering the PGA anti vibration mounts active If the product is transported and reconnected to a different sub...

Page 77: ...re B 6 Figure B 6 PGA lock insert metal bracket Secure the metal bracket to the anti vibration mounts using the two plastic nuts as shown in Figure B 9 Figure B 7 PGA lock attach plastic nuts Note Hold the base of the anti vibration mount while tightening the plastic nuts to prevent twisting of the soft silicone Push each metal pin into the vibration mount assembly as shown in Figure B 9 Figure B ...

Page 78: ...ree cable ties to secure the pins to the metal bracket at the appropriate holes as shown in Figure B 10 Figure B 10 PGA lock pins and locking bracket secured with cable ties The transportation PGA lock is now engaged rendering the PGA anti vibration mounts inactive After the product is removed ensure that it is stored in an upright position Note Any remaining oil in the pipework should be drained ...

Page 79: ...lowing steps describe how to change the battery 1 Back up the product data contact your GE representative 2 Power off the relevant module 3 Open the door on the relevant module to locate the battery on the relevant board 4 Slide the battery out of its housing 5 Replace with a new Panasonic CR2450 3 V 620 mAh coin cell 6 Close the door 7 Power on the relevant module and confirm that all product dat...

Page 80: ...older off the base plate as shown in Figure C 4 Remove the used filter mesh cartridge from the holder and dispose of it as shown in Figure C 5 Replace with a new filter mesh cartridge as shown in Figure C 6 in the orientation shown in Figure C 4 Note the metallic mesh cover must face downwards and outwards in the holder Place the filter holder assembly back onto the module s base plate and secure ...

Page 81: ... Figure C 10 into the tray ensuring that the filter evenly fills the entire space Refit the tray to the gasket on the front door and secure in place using the eight nuts previously removed as shown in Figure C 7 Figure C 7 Louvre catchment tray attached Figure C 8 Louvre gasket tray removed Figure C 9 Louvre catchment tray detached filter removed Figure C 10 Louvre air filter C 3 Oil Filter Cleani...

Page 82: ... progress press Stop Measurement on the HMI to abort the measurement process and return the product to Standby mode Power off the product at the external switch or circuit breaker once it is in Standby mode Close the product s supply and return oil valves Open the door of the Analysis module Pull the black insulating push fit cover by the moulded handle nearer the centre top until the top of the c...

Page 83: ...bed in Section 6 14 WARNING Ensure the product is powered off and disconnect all supplies at their source before continuing Remove the six M2 5 hex bolts holding the external fan group as highlighted in Figure C 14 and separate the mating connectors of the electrical cable to free the fan group from the unit as shown in Figure C 15 to Figure C 17 Use dry compressed air to blow any dust insect matt...

Page 84: ... 92 Power on the product Figure C 14 Peltier cooler Figure C 15 Fan group electrical connection Figure C 16 Peltier cooling fins Figure C 17 Fan group detached from cooler Hood Cooling fins Detached fan group Electrical clip connector Hex bolts six highlighted ...

Page 85: ...intervals in any order D 2 UNIX Epoch register A UNIX Epoch register was added to the host board firmware v1 12 2 to make systems integration easier in cases of system incompatibility Both register formats BCD UNIX will be maintained in future firmware versions and both affect the same single clock The details of the UNIX time registers are listed in Table D 2 Table D 2 UNIX time registers Registe...

Page 86: ...er may have one or more access flags separated by commas Table D 3 lists the supported access flags Table D 3 Access flags Flag Access Description R Read Read access to a single register rgN Read group Read access to a group of length N Nmax 120 W Write Write access to a single register wgN Write group Write access to a group of length N Nmax 120 Access flags may be modified with the addition of t...

Page 87: ...nline DGA monitors should have alarm levels set at commissioning This will ensure that the customer is alerted should the gas concentrations increase While it is the customer s responsibility to set appropriate alarms it is recommended that there always be some alarms set on the DGA monitor as there have been some cases where alarm levels have not been set and the transformer has failed without an...

Page 88: ...150 Value 150 Value 150 Value 150 Note The values cited in this table assume that no previous tests on the transformer for dissolved gas analysis have been made or that no recent history exists If a previous analysis exists it should be reviewed to determine if the situation is stable or unstable Note See the example in Section E 8 at the end of this Appendix E 4 Main Tank Gas Rate Of Change Alarm...

Page 89: ... the oil mass weight in kilograms ρ is the oil density in kilograms per cubic metre d1 is the date of y1 and d2 is the date of y2 Note This is a very generic formula As Kelman equipment readings are taken every day then d2 d1 1 E 4 2 Using Oil Mass Should the transformer owner use oil mass instead of oil volume then ρ 1 000 Thus formula can be simplified to 3 1 2 day ml M y y ROC where y2 y1 is th...

Page 90: ...s Alarm Setups In TransConnect remember to map Caution and Alarm values to Caution Alarm indicators Caution Alarm modes any wired relays and SMS messaging as required E 7 Important Notes All alarm and measurement interval settings must be approved and signed off by the customer After oil treatment degassing regeneration drying mixing etc the alarm settings should be reviewed and changed if necessa...

Page 91: ...he oil itself can produce some hydrogen in the absence of defects Should the online monitor be installed before or within a few months after the commissioning of the transformer hydrogen concentration may rise to 250 ppm This should be taken into consideration when establishing the caution and alarm settings In stray gassing oils hydrogen concentration increases very rapidly when the transformer i...

Page 92: ...nada T 1 514 420 7460 worldwide GA support ge com GE the GE monogram and Kelman are trademarks of the General Electric Company Other company or product names mentioned in this document may be trademarks or registered trademarks of their respective companies GE reserves the right to make changes to specifications of products described at any time without notice and without obligation to notify any ...

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