GE Kelman DGA 900 Plus Installation & Commissioning Manual
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GE Kelman DGA 900 Plus Installation & Commissioning Manual

Transformer monitoring system
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GE
Grid Solutions
Kelman™ DGA 900 Plus
Transformer Monitoring System
Installation & Commissioning Manual
GEDE-GA_M-DLIS-TE.MA-041
Rev 1.1
4-Mar-22

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Summary of Contents for GE Kelman DGA 900 Plus

  • Page 1 Grid Solutions Kelman™ DGA 900 Plus Transformer Monitoring System Installation & Commissioning Manual GEDE-GA_M-DLIS-TE.MA-041 Rev 1.1 4-Mar-22...

  • Page 2: Table Of Contents

    Contents Page Introduction ...................... 7 Product Overview ..........................7 Scope ................................ 7 Safety ......................... 8 Symbols ..............................8 Safety Statements ..........................8 Technical Specifications ................10 Compliance .....................12 Transformer Monitoring System (TMS) ...........13 TMS Options ............................15 Card Option #1: Thermal Models ...............17 Sensor Input Configuration ......................
  • Page 3 10.4.9 Export Setting ..............................94 10.4.10 Finalisation ................................ 95 Parts and Tools List for Bushing & PD monitor .....96 A.1 GE-supplied items (shipped with the product) ..............96 A.2 GE Field Service Engineer (FSE)-supplied items ..............97 A.3 Customer-supplied Items ......................98 Contact &...
  • Page 4 Figure 9-4: Hub module with Thermal Models and Bushing Monitor cards ......... 35 Figure 9-5: Bushing Adaptor – without top cover .................. 37 Figure 9-6: Bushing Adaptor – with top cover ..................37 Table 9-1: GE-supplied materials ......................38 Table 9-2: Customer-supplied tools ....................... 39 Table 9-3: Coaxial cable preparation ...................... 39 Table 9-4: Connecting to the Bushing Adaptor ..................
  • Page 5 Figure 9-20: MMTS side view - #1 ......................50 Figure 5-21: MMTS #1 with jumper ......................51 Figure 5-22: MMTS #2/3 without jumper ....................51 Figure 9-23: Bushing adaptor connections .................... 52 Figure 9-24: CANbus Connection on the DIN rail .................. 53 Figure 9-25: Coax BNC to clips cable ......................
  • Page 6 Figure 10-37: PD Alarms Configuration > Primary C PD Max ..............94 Figure 10-38: BMT > General Settings ....................95 Figure 10-39: Bushing Adaptor Failure Alarms ..................95 Table A-1: GE-supplied items ......................... 96 Table A-2: GE FSE-supplied items ......................97 Table A-3: Customer-supplied items...................... 98 Related Documents Ref#...

  • Page 7: Introduction

    INTRODUCTION Product Overview The Kelman™ DGA 900 Plus (the product) builds on the existing multi-gas online DGA 900 system with additional monitoring capabilities and a series of data models to provide a complete transformer monitoring solution. This flexible offering combines the latest technology and a range of options via a modular and retrofittable architecture.

  • Page 8: Safety

    SAFETY Symbols The meaning of symbols used on the Kelman™ DGA 900 Plus: Caution. Refer to the Installation Manual / Operator Guide to prevent death, injury, equipment damage or loss of data. Electrical Hazard. Risk of electric shock. Primary Protective Earth connection. Hot surfaces may be present.
  • Page 9 The installer shall also ensure that any third-party equipment, such as an approved platform, scaffold or lift is suitable and safe before commencing work. Ladders or improvised platforms do not meet GE service engineer requirements. Do not open the cabinet during inclement weather.

  • Page 10: Technical Specifications

    TECHNICAL SPECIFICATIONS The product meets the following technical specification as outlined in Table 3-1. Table 3-1: Measurements & Operating Specifications BUSHING & PD MEASUREMENTS Input current measuring range 2 mA – 200 mA rms, 1% of reading Relative phase angle accuracy 0.01 deg of angle Maximum number of PD measured 200 pulses per cycle (50 to 60 Hz)
  • Page 11 Note: It is possible for a small amount of condensation to form on the inner surface of the Analysis enclosure. This occurs under certain environmental conditions and does not affect the performance or reliability of the product. 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.

  • Page 12: Compliance

    COMPLIANCE The product is designed to meet the following type tests as listed in Table 4-1. Table 4-1: Type Tests CATEGORY STANDARD Performance TEST Criteria EMC Emissions CISPR 11 Radiated & Conducted Emissions EN 61326- FCC Part 15 Meets the Radiated &...

  • Page 13: Transformer Monitoring System (Tms)

    Figure 5-2. Note: Consult with your GE representative to ensure that the correct option pack(s) are part of your installation. MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1...
  • Page 14 Figure 5-2 illustrates the dataflow, inputs and relationships between the various option packs. Figure 5-2: Option packs dataflow MA-040 – DGA 900 Plus - Operator Guide - Rev 1.1 4-Mar-22 Page 14 of 99...

  • Page 15: Tms Options

    TMS Options The Hub module has four PCB slots as shown in Figure 5-3. From left to right, the first slot houses the Controller PCB as described in the standard DGA 900 Installation manual. Depending on the chosen combination of options, the other three slots as highlighted house the I/O cards for the additional analogue and digital inputs related to the additional modelling and monitoring capabilities.
  • Page 16 Table 5-1 lists all the permutations for the four cards in the three slots. Table 5-1: DGA 900 Plus card options Slot 1 Slot 2 Slot 3 Default Card Thermal Models Thermal Models Cooling Status Default Card Bushing Monitor Thermal Models Bushing Monitor Thermal Models Cooling Status...

  • Page 17: Card Option #1: Thermal Models

    CARD OPTION #1: THERMAL MODELS The thermal card option generates the base models relating to thermal and moisture readings. It integrates data from the existing DGA analysis (for moisture and ambient temperature) and accepts inputs from two 4-20 mA inputs to obtain top- and bottom -oil temperatures (see Section 6.3) and up to three split core CT sensors for transformer load (see Section 6.4).

  • Page 18: Temperature Sensors

    Figure 6-1: Thermal Models wiring Figure 6-2 to Figure 6-4 below show the temperature sensors and CT in detail. Temperature Sensors The temperature sensors measure the top and bottom oil temperatures of the main tank and the OLTC temperature. An example is shown in Figure 6-1 and comprises of a self- contained PT100 with a built-in 4-20 mA transmitter which is powered from the monitoring unit and provides a 4-20 mA output that is read by the analogue input card.
  • Page 19 Figure 6-2: Magnetic mount temperature sensor The oil temperature sensor specification is shown in Table 6-2. Table 6-2: Oil temperature sensor specification Item Value Enclosure Plastic Output 4-20 mA Wiring 12 m (40 ft) twisted, shielded pair 22 AWG & thermal compound Operating −40 °C to 150 °C (−40 °F to 302 °F) temperature...
  • Page 20 An overview to the fitting of a magnetic mount temperature sensor to the tank wall is shown in Figure 6-3. Figure 6-3: Magnetic mount temperature sensor – installation overview MA-040 – DGA 900 Plus - Operator Guide - Rev 1.1 4-Mar-22 Page 20 of 99...

  • Page 21: Ct Sensors

    CT Sensors The split core CT as shown in Figure 6-4 clamps over a cable, snapping around the centre conductor to measure the current passing through. The CT provides a voltage that is proportional to the measured current. Figure 6-4: Split core CT CT dimensions are listed in Table 6-3.
  • Page 22 CT specifications are listed inTable 6-4. Table 6-4: CT specifications Item Value Opening 0.75 in / 1.905 cm ID Connections 8 ft / 2.4 Meter Twisted Cable 20 AWG* Input 200 Amp Output 0.333 Volt at rated current Linearity accuracy ± 1% Accuracy 10% to 130% of rated current Phase angle...

  • Page 23: Card Option #2: Cooling Status Monitor

    CARD OPTION #2: COOLING STATUS MONITOR The cooling card option monitors up to four cooling bank units (pumps, fans etc). This card requires the Thermal Models option as described in Section 6 and improves the accuracy of the Thermal Models. The cooling card uses a CT to monitor the current drawn by each cooling bank.

  • Page 24: Wiring

    Wiring The cooling banks wiring is shown in Figure 7-1 and Figure 7-2. The Cooling Status monitors up to four cooling banks using analogue inputs (as shown in Figure 7-1) or using digital inputs (as shown in Figure 7-2). Refer to Section 6.4 for more information on the CTs. Figure 7-1: Cooling Banks –...
  • Page 25 The digital inputs for the cooling status and thermal models wiring are shown in Figure 7-2. Digital inputs are polarised, and the positive supply must be connected to the D+. Maximum current is 25 mA. Maximum voltage is 24 V. Figure 7-2: Cooling Banks –...

  • Page 26: Card Option #3: Oltc Monitor

    CARD OPTION #3: OLTC MONITOR The OLTC card option is designed to monitor one OLTC and integrates data from several sources. The OLTC tap position is monitored by either measuring the resistance of the OLTC resistor wheel or by an available 4-20 mA current loop. Two 4-20 mA current loop temperature sensors provide the transformer main tank top oil temperature and the OLTC temperature.
  • Page 27 The OLTC Monitor requires the wiring of two temperature sensors, a tap position tracker and a Motor Torque Converter. If the Thermal Models is also installed, the Top Oil Temperature is already available and the Top Oil Temperature sensor for the OLTC Monitor must not be installed.
  • Page 28 4-20 mA input. Figure 8-2 shows the wiring plan and the 4-20 mA output connected to the product. Note: Contact GE for specific details on the implementation. The installation position within the motor circuit does depend on the configuration, for example, if DC braking is deployed.
  • Page 29 Figure 8-2: OLTC Monitor wiring – single phase 8.1.2.2.1 CT Specification Response Time: <160 ms Primary Nominal Current range: > Motor Nominal Current Consumption MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1 4-Mar-22 Page 29 of 99...

  • Page 30: Motor Power Converter

    Motor Power Converter The active power measuring converter module as shown in Figure 8-3 is wired in line with the OLTC motor in the relevant control cabinet and provides a 4-20 mA output. Figure 8-3: Power Converter The specification and dimensions for the Power Converter are shown in Figure 8-4. Figure 8-4: Power Converter –...
  • Page 31 To connect the power converter to the OLTC motor, use the wiring diagram shown in Figure 8-5. To connect the power converter in the OLTC to the DGA 900 Hub module, use standard twisted pair cable for the 4-20 mA input. Figure 8-5: Power Converter –...
  • Page 32 After installing the Motor Power Converter, the OLTC Tap Position and OLTC Torque models must be left disabled (refer to ‘Section 6.4: Models Activation and Status’ in the ‘MA-040 – DGA 900 Plus – Operator Guide’) until commissioning is successfully completed. MA-040 –...

  • Page 33: Card Option #4: Bushing & Pd Monitor

    The product should not be mounted where it may interfere with the transformer cooling system or maintenance activities. Contact GE Technical Support before mounting the product directly on the transformer. See Section 7 of the standard MA-024 DGA 900 Installation Manual for further guidance on mounting and location advice.

  • Page 34: Inside The Hub Module

    Figure 9-1: General installation layout – single transformer Figure 9-2 illustrates the general installation layout of a DGA 900 Plus with the required connections for a bank of three single phase transformers. Figure 9-2: General installation layout – bank of 3 single phase transformers Inside the Hub Module The Hub module as shown in Figure 9-3 contains all the connectivity required for monitoring bushings &...
  • Page 35 Bushing card Top Oil Sensor & Controller card RS-485 24 V DC wetting terminals Model / Analog inputs Mains input Grounding bars Relay connectors Bushing & Neutral CT inputs Figure 9-3: Hub module Typically, the Bushing Monitor card is installed in slot 3 as shown in Figure 9-40, but the card locations are interchangeable.

  • Page 36: Power & Communications

    Power & Communications If possible, pre-install the power supply and communications cable connections from the intended product location to their sources. See Section 9.1 for the general installation layout. A suitable circuit meeting the technical specification requirements must be available for the product at the time of installation. Installation must be done in accordance with local wiring regulations.

  • Page 37: Bushing Adaptor Cables

    Figure 9-5: Bushing Adaptor – without top cover Figure 9-6: Bushing Adaptor – with top cover The rubber O-rings must not be contaminated with grease during the assembly process. Both ends of the coaxial cables for the Bushing Adaptor and Neutral CT must be prepared and fitted with pin terminals as described in Section 9.4.1.1.
  • Page 38 9.4.1.1.2 Required Materials & Tools The materials listed in Table 9-1 are shipped with the product and are required for connecting the coaxial cables to the Bushing Adaptors and to the shorting switch. Table 9-1: GE-supplied materials Coaxial cable RG-58C/U 150m (500ft) Red pin terminals MA-041 –...
  • Page 39 Heat shrink in. tubing 60 mm (2.4 in.) Heat shrink ¼ in. tubing 60 mm (2.4 in.) Cable markers The tool as shown in Table 9-2 is supplied by the customer and is recommended for preparing the coaxial cables. Table 9-2: Customer-supplied tools Heat gun 9.4.1.1.3 Coaxial Cables Preparation Each coaxial cable must be prepared on both ends (Bushing Adaptor and cabinet) as...
  • Page 40 7. Use a heat gun to shrink the 3/16 in. tubing. 8. Then, insert the ¼ in. tubing to overlap about 15 mm (0.6 in.) over the metallic braid. 9. Use a heat gun to shrink the ¼ in. tubing. 10.
  • Page 41 5. Insert the coaxial cable through the connector fitting of the Bushing Adaptor cover. 6. Connect the wires to connector J3 of the Bushing Adaptor board. 7. J3 is a spring-cage type connector. Open the terminal point with a small flat insulated screwdriver.
  • Page 42 Repeat these steps for all input phases for the Bushing Adaptors and the Neutral CT(s). 9.4.1.1.6 Connecting to the HFCT To connect to the HFCT, follow the steps as outlined in Table 9-6. Note: At the HFCT end, the coaxial cable does not require terminals. Table 9-6: Connecting to the Neutral CT Steps Visual...
  • Page 43 8. Connect the cable to the terminals of the HFCT. 9. The central white wire must be connected to the core side. 10. The braid shield must be connected to the shield side. 11. Tighten the set screws using a hex key wrench (1.5 mm).

  • Page 44: Install A Bushing Adaptor

    If it is a good fit, continue with the Bushing Adaptor installation. If the original test tap cap does not fit the plastic-threaded cap, halt the installation and contact GE Technical Support. Note: See Section 9.8 for the test procedure on how to verify the circuit integrity of...
  • Page 45 Bushing Adaptor in steps of no greater than 20 N m (15 lb ft) until you reach the final torque requirement to minimise mechanical stress. Note: A suitable torque wrench is specified in Table A-2: GE FSE-supplied items. 9.4.2.7 Finally, check that the resistance between the Bushing Adaptor body and the bushing tapping point remains less than 5 Ω.
  • Page 46 Figure 9-10: Liquid-tight fitting thread 9.4.2.10 Thread the end of the metal liquid tight conduit as well as the coaxial cable into the fitting. Terminate the conduit into the fitting carefully to form a liquid-tight assembly. 9.4.2.11 Place the O-ring in its seat for the cover (see Figure 9-5). 9.4.2.12 Connect the coaxial cable as outlined in Section 9.4.1.1.4.

  • Page 47: High Frequency Current Transformer (Hfct)

    9.4.2.14 To compress the sealing O-ring evenly, tighten the five screws progressively working across the circle rather than around the circle of screws as illustrated in Figure 9-12. Tighten the screws to the torque specified in the installation drawing (46-XXXX) provided with each Bushing Adaptor. Figure 9-12: Tightening order WARNING: Ensure that the Bushing Adaptor has been assembled carefully with the liquid tight fitting and conduit to form a liquid tight connection.
  • Page 48 WARNING: Prior to any test that requires the removal of the transformer neutral ground, any installed HFCT must first be removed. Replace the Neutral HFCT after the transformer ground has been reconnected. Preparation of the coaxial cables is outlined in Section 9.4.1.1.3 and 9.4.1.1.6. Figure 9-13: HFCT cannot be installed if a switch is on cable from the Neutral Bushing to ground To minimise noise, the HFCT should be installed as close to the High Voltage Neutral bushing as possible provided there is no switch on path to ground as per the warning...
  • Page 49 Figure 9-15: Star configuration (Y-Connection) Similarly, in Figure 9-16, the HFCT can be installed after the switch. However, it should be understood if for any reason the switch is opened, the path to ground will be interrupted and the HFCT will have absolutely no positive affect, resulting in PD diagnostic capabilities being disabled.

  • Page 50: Magnetically Mounted Temperature Sensors

    ▪ Apply a liberal amount of thermal compound (Wakefield Engineering Thermal Joint Compound 120 series, GE P/N: CONS01026) on the metal probe located in the centre as shown in Figure 9-18. Note: A lack of thermal compound degrades sensor performance.
  • Page 51 ▪ Apply RTV silicon sealant around the edge of the MMTS. This helps keep out moisture and aids in the adhesion. Note: No RTV silicon is supplied with the product. If installing more than one MMTS, they must be wired in series ensuring that the last MMTS on the CANbus line is MMTS #1.

  • Page 52: Cabinet Connections

    Cabinet Connections Do not open the cabinet during inclement weather. ALL cables entering the cabinet should have at least 150 mm (6 in.) of excess length to allow for cable strain relief. Before connecting the Bushing Adaptor coaxial cables to the product cabinet, test that the ground connections have been made correctly.

  • Page 53: Magnetically-Mounted Temperature Sensors

    9.7.2 Magnetically-Mounted Temperature Sensors The MMTS are connected to the CANbus connectors on the DIN rail. See Figure 9-3 for an overview to the key parts of the product and Figure 9-24 below for a more detailed look at the connection points. Terminal Key (SHD) Shield 12 V DC (red)

  • Page 54: Bushing Adaptor Circuit Integrity Test Record

    Bushing Adaptor Circuit Integrity Test Record The Bushing Adaptor Circuit Integrity Test is to be performed upon installation, after periodic transformer maintenance or any bushing repair activities. 9.8.1 Required Material ▪ Antenna Analyser, RigExpert AA-170 model (>170 MHz) ▪ UHF to BNC adaptor ▪...

  • Page 55: Test Procedure

    9.8.2 Test Procedure The RigExpert handheld antenna analyser is used to verify the electrical connection of the internal Bushing Adaptor. Before commencing the test: Ensure that the transformer is switched off and properly grounded. The product must not be energised. Close terminal inputs to isolate the signals from the device as shown in Figure 9-27.
  • Page 56 Figure 9-28: AntScope New measurement – Configure > AA-170 Analyzer In Windows File Explorer, create a new folder for the installation of each Bushing Adaptor phase. 9.8.2.2 RigExpert Tests 9.8.2.2.1 Open Circuit Test Place the coaxial cable so that during the calibration and the subsequent measurements minimal movement of the cable will occur.
  • Page 57 Figure 9-30: Limits scan range The progress of the scan is displayed on the status bar (bottom left of the AntScope window). Wait until the scan is finished as shown in Figure 9-31. Figure 9-31: AntScope measurement - Open To save the calibration, select Configure > Save last measured data > as “open” Calibration as shown in Figure 9-32.
  • Page 58 Figure 9-32: Configure > Save last measured data > as “open” calibration Select File > Save As and type the filename calibOpen as shown in Figure 9-33. Figure 9-33: Save As “calibOpen” 9.8.2.2.2 Short Circuit Test Connect the clips to each other as shown in Figure 9-34. MA-041 –...
  • Page 59 Figure 9-34: Short calibration Click the ‘Start/Stop Measurement’ button to start a measurement as shown in Figure 9-35. Figure 9-35: AntScope measurement - Short Select Configure > Save last measured data > as “short” calibration as shown in Figure 9-36. MA-041 –...
  • Page 60 Figure 9-36: Configure > Save last measured data > as “short” calibration Select File > Save As and type the filename calibShort as shown in Figure 9-37. Figure 9-37: Save As “calibShort” 9.8.2.2.3 Load Test Connect the 50 Ω resistor across the clips as shown in Figure 9-38. MA-041 –...
  • Page 61 Figure 9-38: Load calibration Click the ‘Start/Stop Measurement’ button to start a measurement as shown in Figure 9-39. Figure 9-39: AntScope measurement - Load Select Configure > Save last measured data > as “load” calibration as shown in Figure 9-40. MA-041 –...
  • Page 62 Figure 9-40: Configure > Save last measured data > as “load” calibration Select File > Save As and type the filename calibLoad as shown in Figure 9-41 to save the data in the folder created in Section 9.8.2.1 for this Bushing Adaptor. Figure 9-41: Save As “calibLoad”...
  • Page 63 Figure 9-42: Bushing adaptor measurement Click the ‘Start/Stop Measurement’ button to start a measurement as shown in Figure 9-43. Figure 9-43: AntScope measurement - AdaptorOnly Select File > Save As and type the filename AdaptorOnly as shown in Figure 9-44. MA-041 –...
  • Page 64 Figure 9-44: Save As “AdaptorOnly” 9.8.2.2.5 Adaptor Installed Connect the Bushing Adaptor to the bushing tapping point as outlined in Section 9.4 Bushing Adaptors. Click the ‘Start/Stop Measurement’ button to start a measurement as shown in Figure 9-43. Select File > Save As and type the filename AdaptorInstalled as shown in Figure 9-45.
  • Page 65 Figure 9-46. Without electrical contact, the installation must be aborted, and the original test tap covers refitted. Figure 9-46: AntScope measurement - AdaptorInstalled Move the cursor over −45° or as close as possible as shown in Figure 9-47. The Cpar (Capacitance parallel) will be the bushing capacitance stated on the nameplate (±...
  • Page 66 ▪ ▪ Temperature If possible, photograph the bushing nameplates. The bushing nameplate images must be stored with the field service installation report and the antenna analyser data. Also record the following items in Table 9-7: Results: ▪ Bushing Adaptor ID. ▪...
  • Page 67 Figure 9-49: Resistance measurement Record the measurement as [R1] in Table 9-7: Results. It should be less than 3000 Ω and within 5% of the Bushing Adaptor input resistance. To verify the measurement, use the Administrator login and factory password of the month (POTM) to gain access to service mode.
  • Page 68 Figure 9-51: R2 resistance measurement Record the measurement as [R2] in Table 9-7: Results. It should be less than 2000 Ω and within 5 % of the input channel impedance. To verify the measurement, use the Factory Login, Press BMT > Calibration – HF / LF multipliers and Input Impedance.
  • Page 69 Figure 9-53: R3 total resistance measurement Ensure that the measurement of [R3] is within 5% of the total input resistance [R input calculated from [R1] and [R2] for each input. Note: The total input resistance [R ] is calculated as [R ]=1/(1/[R1] + 1/[R2]) input input...
  • Page 70 Table 9-7: Results Date: ____________ Section Description 9.8.2.3 Bushing Adaptor ID 9.8.2.3 Mag Mount Temperature Sensor (MMTS) # (3 single phase install) 9.8.2.4.5 Bushing Adaptor Internal Pin Correctly Installed (Yes / No) 9.8.2.3 Manufacturer Nameplate Power Factor % [PF%] 9.8.2.3 Manufacturer Nameplate Capacitance [C1] 9.8.2.3...

  • Page 71: Commissioning & Service

    COMMISSIONING & SERVICE This section details essential operational tasks and all first start-up procedures that need only be performed once as part of the commissioning phase to prepare the product for deployment in the field. Refer to the relevant sections below depending on the installed options.

  • Page 72: Models

    The models can be saved, uploaded and downloaded together with the rest of the DGA 900 configuration via the dashboard menu option. 10.2 Models Sometimes it is necessary to reset a specific model or its parameters due to a change in initial conditions and/or a change in hardware.

  • Page 73: Oltc Monitor Commissioning

    Limits for OLTC motor torque model alarms The models require custom parameters unique to each tap changer. These can be found in the customer-specific ‘Models Configurator’ spreadsheet (available from the GE Service Team). OLTC commissioning requires the A14 (tap position) and A17 (motor torque) inputs.

  • Page 74: Prerequisite Commissioning Steps

    Table 10-2: OLTC files Source File Purpose Service Team Commissioning_Document_v1.2 Spreadsheet tool required for autogenerating the OLTC configuration files. Spreadsheet with reference values to Service Team Models Configurator complete calculations. Service Team / Tap position map (manual mechanical TapPositionCalibration.cfg Customer mappings) Autogenerated TapPositionCalibration.cfg...
  • Page 75 8. Once the download completes, check that the ‘Data Table’ tab contains no OLTC Tap Position or OLTC Torque data. 10.3.1.2 Disable Motor Torque Alarms (if required) If the customer has agreed to allow the product to run for a set period in order to gather additional data on which to generate alarms, then the motor torque alarms should be disabled for this period.
  • Page 76 Figure 10-5: OLTC Motor Torque Total Time (%) The adjacent box should list All limits as shown in Figure 10-6. If not, select the ‘Alerts’ dropdown menu and choose All limits. Figure 10-6: OLTC Motor Torque Total Time (%) – Alerts Off For each Alert, use the slider control to slide the Alert to the Off position as shown in Figure 10-6.

  • Page 77: Establish Baseline Settings

    The adjacent box should list All limits. If not, select the ‘Alerts’ dropdown menu and choose All limits. For each Alert, use the slider control to slide the Alert to the Off position. Select ‘OLTC Motor Torque Maximum 3 (%)’ from the Alarm source dropdown menu.
  • Page 78 Figure 10-8: Configuration Import – TapPositionCalibration.cfg Use the product’s HMI to verify the sensor parameters and motor torque profile parameters. Select Models > OLTC Motor Torque Configuration and ensure that all parameters, for example as shown in Figure 10-9, match those as given by the manufacturer of the torque converter.

  • Page 79: Download Dga 900 Plus Data To Perception

    Use the product’s HMI, select Models > OLTC Motor Torque to verify the parameter values. In the OLTC Motor Torque page, ensure that all the parameters display a value (i.e. are not offline). If the parameters read ‘Offline’, return to Step Increase the tap changer position by one.
  • Page 80 Type a meaningful name for the database e.g. [DGA900_PLUS_SERIAL_NUMBER]_[DATE & TIME]_COMMISSIONING_[CUSTOMER_NAME] In the Asset Explorer, right click on the newly created database and select New > DGA 900 Plus as shown in Figure 10-11. Figure 10-11: New > DGA 900 Plus database On the Properties tabbed page, enter the connection details.

  • Page 81: Generate Configuration Files

    Figure 10-12: Add / Remove Measurements Points > Tap Position & OLTC Motor Torque 12. Right click in the data area and select Export to CSV. In the Export to CSV dialog box, browse to an appropriate location, type a suitable filename and click Save.
  • Page 82 Figure 10-13: Microsoft Excel — Commissioning_Document_v1.2 — Dashboard homepage Click the Load Perception CSV button on the sheet. In the dialog box, browse to the location of the Perception CSV file as downloaded in the previous section, select that file and click Open. A dialog box confirms if the data from the file is successfully accepted by the tool.
  • Page 83 Figure 10-14: TapPositionCalibration.cfg Click the Generate Group Definition File button to create the ‘OltcGroups.cfg’ file. In the dialog box, browse to the folder location for the configuration file and click A message box confirms with the message ‘File creation complete’ when the configuration file is successfully created in the specified location.
  • Page 84 Figure 10-15: OltcGroups.cfg Click the Generate Group Reference File button to create the ‘OltcRefData.cfg’ file. In the dialog box, browse to the folder location for the configuration file and click A message box confirms with the message ‘File creation complete’ when the configuration file is successfully created in the specified location.

  • Page 85: Import Configuration Files To Dga 900 Plus

    Figure 10-17: Required files for OLTC commissioning These files should be stored with the Commissioning Report. 10.3.5 Import Configuration Files to DGA 900 Plus To complete the commissioning process, import the recently generated configuration files into the product. Follow these steps to perform the configuration import: Using the remote HMI from the computer, connect with the DGA 900 Plus and log in as an Administrator.
  • Page 86 This completes the commissioning process. Service personnel must fully complete the hardcopy Commissioning Report onsite to sign off the commissioning (a triplicate booklet from the GE Service Team). MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1...

  • Page 87: Bushing & Pd Monitor Commissioning

    10.4 Bushing & PD Monitor Commissioning DGA 900 Plus products with a bushing card enabled must undergo BMT commissioning. This section outlines parameters to be verified while the transformer is energised and running at operational conditions regarding the grid voltage (phase and amplitude). Note: Transformer load is irrelevant for commissioning.

  • Page 88: C1% Measurement

    Figure 10-22: Voltage Measurement 10.4.3 C1% Measurement To ensure that the configuration is correct for this system: ▪ Select BMT > Live Measurement as shown in Figure 10-23 and ensure that the ‘Expected Current mA’ for each phase is within 10% of the measured current mA reading.

  • Page 89: Tan Δ (Power Factor) Measurement

    If the C1% measurement is above 5% after these checks, please contact GE customer support team. 10.4.4 C.4 Tan δ (Power Factor) Measurement To verify that the wiring is correct and that initial alarms levels are appropriate for the system with instantaneous Tan δ measurements: ▪...

  • Page 90: Pd Live Hf Noise Threshold Measurement

    Figure 10-26: Bushing Alarms Configuration To disable instantaneous Tan δ measurements: ▪ Select BMT > Configuration as shown in Figure 10-27 to verify the ‘Exponential Moving Average Configuration’. Ensure that: − ‘Daily Moving Average Enable’ is On − ‘Moving Average Factor Phase Angle’ is 10000 Figure 10-27: Exponential Moving Average Configuration 10.4.5 PD Live HF Noise Threshold Measurement The HF input noise can range over many orders of magnitude depending on the...

  • Page 91: Pdi Associated Power Measurement

    Figure 10-29: HF Gain Control 10.4.6 PDI Associated Power Measurement ▪ Select BMT > Live Measurement and scroll down to the ‘PD’ section with the Primary tab active as shown in Figure 10-30. Ensure that: − Associated Power (PDI) measurement is less than 800 mW for each phase. If above 800 mW, the PDI Polar Plot alarm levels must be adjusted.

  • Page 92: Pd Average Apparent Charge Measurement

    Figure 10-31: PD Alarms Configuration > Primary PDI 10.4.7 PD Average Apparent Charge Measurement ▪ Select BMT > Live Measurement and scroll down to the ‘PD’ section with the Primary tab active as shown in Figure 10-32. Ensure that: − Avg Apparent Charge measurement is below 800 pC for each phase. If above 800 pC, the PD Polar Plot Level Alarm must be adjusted.
  • Page 93 ▪ Select BMT > Live Measurement and scroll down to the ‘PD’ section with the Primary tab active as shown in Figure 10-34. Ensure that: − PD Max Apparent Charge measurement is below 600 pC for each phase. If above 600 pC, the PD Max Level Alarm must be adjusted.

  • Page 94: Export Setting

    Figure 10-35: PD Alarms Configuration > Primary PD value Figure 10-36: PD Alarms Configuration > Primary B PD Max Figure 10-37: PD Alarms Configuration > Primary C PD Max 10.4.9 Export Setting After the alarms are configured on the energised transformer, select BMT > General Settings and click Export to PC to retain a record of the configuration as shown in Figure 10-38.

  • Page 95: Finalisation

    Figure 10-38: BMT > General Settings 10.4.10 Finalisation After installation, ensure that the Bushing Adaptor failure alarms are all cleared as shown in Figure 10-39. Figure 10-39: Bushing Adaptor Failure Alarms MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1 4-Mar-22 Page 95 of 99...

  • Page 96: Parts And Tools List For Bushing & Pd Monitor

    The parts, supplies and tools for the bushing and PD monitor installation are listed in Table A-1 to Table A-3 and are needed on site at the time of the installation. Note: Confirm with GE Technical Support as lubricants and quantities are subject to change without prior notice. GE-supplied items (shipped with the product)

  • Page 97: Ge Field Service Engineer (Fse)-Supplied Items

    Ethernet cable Ferrite (Würth 7427 154) when optional copper Ethernet module is ordered (GE P/N: ELEC04004) GE Field Service Engineer (FSE)-supplied items If GE performs the installation, the GE FSE will bring the following items: Table A-2: GE FSE-supplied items Description Handheld multimeter 4½...

  • Page 98: Customer-Supplied Items

    Customer-supplied Items The following items are procured by the customer: Table A-3: Customer-supplied items Description Armoured mains cable to power the product. Grounding cable to connect primary protective earth terminal lug of the product cabinet to the ground. > Liquid-tight flexible metal conduit (½ in. and/or ¾ in.) to provide protection for the Bushing Adaptors’...

  • Page 99: Contact & Copyright Details

    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 person of such changes.

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