PTM
What’s New Version 4.10
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PTM 4.10 General New Features & Improvements
Primary Test Manager now offers the new asset “Rotating Machine” and corresponding tests
New features for DIRANA o Dielectric response analysis for testing of instrument transformers and rotating machines o Customized categories for moisture and oil conductivity o Excel export
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PTM 4.10 Features & Improvements for Transformer Testing
Transformer testing with TESTRANO 600 o Dynamic OLTC-Scan (DRM) including static winding resistance – Single phase measurement and graphical representation of the current during switching of the OLTC on all available phases. Filters can be applied for phase parity of the tap and up or down cycle. This method can be used to evaluate the switching process of resistor type tap changers with respect to timing, discontinuities, contact wear and resistors. The test also includes the measurement of the static winding resistance for each tap so no additional test of the winding resistance is required. o Fully automated excitation current test with up to 12 kV – Single phase measurement of excitation (no load) current of transformers with a test voltage of up to 12 kV. Measurements can be performed on all tap positions in full automatic mode using tap changer control of TESTRANO 600. CP TD1 accessory required. o Calculation of voltage or turns ratio – When performing ratio measurements, PTM 4.10 offers the option to either calculate the voltage or the turns ratio. o Automatic assessment of phase shift – When performing 3 phase ration measurements, PTM 4.10 offers automatically alerts the user of any abnormal deviations between the measured phase shift and the nominal phase shift based on the specified vector group o Automatic calculation of tap voltages based on % deviation from nominal position
Transformer testing with CPC 100 o Dynamic OLTC-Scan (DRM) including static winding resistance – The dynamic OLTCScan (DRM) test in CPC 100 now also includes the measurement of the static winding resistance for each tap so no additional test of the winding resistance is required. o Calculation of voltage or turns ratio – When performing ratio measurements, PTM 4.10 offers the option to either calculate the voltage or the turns ratio. o More flexibility when comparing winding resistance measurements - The user has the option to compare static winding resistance measurements from different transformers regardless of the number of phases or tap positions that were tested. Before the number of phases and tap positions and the order in which they were tested had to match between two tests in order to be able to compare them. It is now also possible to compare static winding resistance values captured during a Dynamic OLTC-Scan (DRM) tests with the results of a winding resistance test. o Automatic calculation of tap voltages based on % deviation from nominal position o New Line Impedance Test Card: The new line impedance test card makes line impedance testing much easier and faster, due to: Guided workflow implemented in test card Significant improvements on the User Interface Final results are now displayed on test card, no EXCEL template needed anymore on-site
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PTM 4.10 Features & Improvements for Switch Gear Testing
GIS Timing test o Primary Test Manager now offers a dedicated timing test for gas insulated switchgears. This test makes use of the Current Sensor Measurement (CSM) and provides graphical as well as numerical results similar to the non-GIS timing test. Demagnetize current transformers o The CIBANO system is now capable of demagnetizing the current transformers in the circuit breaker’s main contact path (e.g. GIS or dead tank breakers). The demagnetization routine can be done from the primary side and does not need access to the current transformer’s secondary side. Bounce filter for main and auxiliary contacts o The new bounce filter can be applied to the measurements of main and auxiliary contacts. It removes contact gaps from the measurement that are smaller than a given duration. The user can define separate minimum durations for main contacts and auxiliary contacts separately. Bounce analysis for main contact measurements o When measuring circuit breaker main contacts, Primary Test Manager analyses the duration and amount of contact bouncing. The results are provided numerically within the results tables. Test groups o When defining a test list in Primary Test Manager, it is possible to combine several tests to a test group. This allows the user to define common settings (Hardware configuration, settings and conditions) on group level which automatically applies to all tests within the group.
Allow to operate motor during Permanent Power Supply o Primary Test Manager now allows to operate the motor supply while the permanent power supply is active. This feature makes it possible to run a motor current test even if the breaker needs to be supplied continuously. Breaker state indication o Primary Test Manager now shows the circuit breaker state in the user interface of Timing tests with the CIBANO 500 main unit. The main contact state of each pole is indicated by symbols. Possible states are Open, Closed or Unknown which indicates that the main contact state could not be detected. Additional changes o Digital motion measurement: Correction of a time offset for the digital motion measurements. Old measurements will automatically be corrected while loading the test. New measurements will have the correct timing.
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PTM 4.10 Features & Improvements for Instrument Transformer Testing Instrument transformer testing with DIRANA Dielectric response analysis Insulation resistance, polarization index (PI) as well as dielectric absorption rate (DAR) tests
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PTM 4.10 Features & Improvements for Rotating Machines Testing New asset “Rotating Machines” added Rotating machines testing with CPC 100 + CP TD1 Manual tan delta test Rotating machines testing with DIRANA Dielectric response analysis Insulation resistance, polarization index (PI) as well as dielectric absorption rate (DAR) tests
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PTM
What’s New Version 4.00
© OMICRON 2017
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PTM 4.00 – General New Features & Improvements
Additional test sets supported With the addition of DIRANA and TESTRANO, PTM now supports the following test sets: CPC 100 / CPC 80 with accessories TESTRANO 600 FRANEO 800 DIRANA CIBANO 500
Data synchronization Visualization of changed jobs / assets “Select all” for subscribing locations
Insulation resistance test added Perform HV DC insulation resistance tests with any 3rd party HV DC IR tester on the market and enter the data to PTM via direct input, data interfaces, Excel import or via clipboard Create IR test reports with PTM
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PTM 4.00 Features & Improvements for Transformer Testing
Oil Analysis DGA analysis for the transformer main tank according to IEC60599 and IEEE C57.104: Assessment summary Duval triangle 1, 4 and 5 IEC basic ratios including 3D-graph visualisation Rogers, Doernenburg and MSS ratio methods Key gas method DGA trending
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Transformer testing with TESTRANO 600 Both guided and manual workflows supported DF & Cap, short-circuit impedance, turns ratio, DC winding resistance and demagnetization tests DIRANA test Full integration of DIRANA for power transformers including moisture analysis, dielectric response test, tan(δ)/PF, capacitance, insulation resistance, PI, DAR… Up to 20x faster testing than before due to revolutionary FDS & PDC+ combination Automatic frequency range setting: Detects the optimum frequency range and ensures minimum measurement time Fully automatic measurement & assessment mode ensures optimal results without expert knowledge Integration in PTM database Databases for ester-filled transformers Powerful reporting The new DIRANA PTM software can be used with all existing DIRANA devices without an additional license!
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Sweep Editor for Tan Delta tests Users are now able to create his own custom sweeps for tan delta tests: Voltage sweep Frequency sweep
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Templating for power transformer testing Users are now available to create their own test list templates: Sorted after Asset type/Phases Can be applied to all kind of power transformers with automatic adaption to asset
Support of CP SB1 with single-phase transformers Better comparison of TTR test results Comparison of two tests without exact same test settings is now possible New vector groups YND3/YD3 DYN3/DY3 YND9/YD9 DYN9/DY9
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PTM 4.00 Features & Improvements for Switch Gear Testing
Automatic assessment for Motor Current test results The Motor Current test now offers an automatic assessment of its new numerical results Inrush Current and Charging Time. The assessment limits (absolute or relative) can be entered directly in the asset definition (”Assessment limits“ tab) or in the Motor Current test (”Assessment“section). Automatic assessment for auxiliary contact timings The assessment of CIBANO 500 Timing and Dynamic Contact Resistance tests now allows also the automatic assessment of auxiliary contact timings (”Switching time“, ”Diff. to main“ and ”Duration“). The assessment limits can be defined in the asset definition (“Assessment limits” tab) or directly in the test (“Assessment” section). Automated stop of motor supply when charging is finished The Motor Current test is now automatically stopped when the motor finished the charging process. The CIBANO device monitors the current drawn by the motor during the charging process and automatically stops the operation when no current is drawn anymore. The same applies for the “Supply motor” option executed from any other CIBANO 500 test in PTM. Permanent power supply on channel B3 The CIBANO 500 now offers to enable the channel B3 as permanent power supply. This power supply can be switched on even if no test is currently running and it is not interrupted while executing a test. The voltage level can be in the range of -300V…300V DC or 0 … 240V AC. Since the CIBANO device can only put out one voltage level at a time, the permanent power supply and other voltage outputs have to have the same voltage level. Megger import PTM is now able to import numerical measurement data from Megger’s CABAWin format. In the Manage view, choose “Import from Megger CABAWin” from the “Import” menu in the job column and select the root folder of the CABAWin job to import. PTM will then read available asset information and measurement data. The data is imported in the PTM database. Use conversion tables for contact travel measurements The former “Contact factor” setting for contact travel measurements is extended to also load “Conversion tables” that translate an angular transducer movement to a linear main contact movement (degree to millimetres). PTM supports a generic CSV format (User Manual includes details) and Megger’s TBL-format for conversion tables. The conversion tables are added to the circuit breaker asset and can then be used in the corresponding tests. It is still possible to use a linear factor which is then again the Contact Factor. CIBANO 500 hardware self-test The CIBANO 500 system is safer now. The device software performs a “hardware self-test” before executing the first test after booting the device. The CIBANO 500 will automatically check vital components like the switch-matrix output relays and report back if the test was passed or not. If not, PTM shows an information with further instructions. The test will prevent the CIBANO system from executing tests with malicious hardware.
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PTM 4.00 Features & Improvements for Instrument Transformer Testing
VT asset added New tests for voltage transformers added VT Ratio VT Burden VT PF & Cap.
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PTM
What’s New Version 3.50
© OMICRON
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PTM 3.50 – General New Features & Improvements
1.1
Automatic upgrade of CPC 100/80 embedded software
1.2
PTM automatically detects if an embedded software upgrade for CPC 100/80 is required and provides an option to initiate the upgrade process.
Customer Experience Improvement Program (CEIP) The Customer Experience Improvement Program (CEIP) collects information about how you use Primary Test Manager without interrupting you. This helps OMICRON identify which features to improve. No information collected is used to identify or contact you. We encourage you to join the program to help improve Primary Test Manager.
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PTM 3.50 Features & Improvements for Testing Transformers
2.1
Improvement of DC Winding Resistance Test
2.2
2.3
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When using the CP SB1, the user can select any tap position and automatically measure the winding resistance of all three windings. With this option, selective three-phase measurements on individual tap positions (e.g. mid, high, low) can be easily performed. When testing windings with a DETC, automatic measurements on all three phases can be performed using the CP SB1. When testing windings without a tap changer, automatic measurements on all three phases can be performed using the CP SB1. When testing one-phase transformers, automatic tap control of the CP SB1 can be used to perform automatic measurements on all tap positions.
Selective nameplate locking After a test has been executed, only the nameplate parameters which affect this specific test will be locked for editing. In contrast to previous versions, users will be able to change other nameplate values (e.g. bushing data) if the tests linked to those parameters have not been executed.
Assessment status overview In the assessment status overview, the user is able to differentiate if an assessment has been done for every executed measurement and if an assessment has been manually corrected by the user. Bug fix of representation of aggregated assessment status.
PTM 3.50 Features & Improvements for Testing Circuit Breakers
Automated suggestion of default Contact Factor. If not otherwise specified, the idealized Contact Factor is automatically calculated from the measurement data and the nominal total travel in the circuit breaker nameplate.
Auxiliary contact timing. Primary Test Manager now automatically detects the type of measured auxiliary contacts and calculates their switching time, duration and time difference to the corresponding main contact. These values are also part of the test report.
Motor current numerical results. Primary Test Manager now automatically calculates, displays and reports the inrush current and charging time when doing a Motor Current test.
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Auto-update also available for CIBANO 500 device software. The auto-update of the Primary Test Manager now supports to update the CIBANO 500 device software independently from PTM.
Closing time calculation in O-CO sequence. Primary Test Manager now calculates the main contact closing time when executing an O-CO operation sequence.
Check hardware modules to restore configuration. Primary Test Manager automatically checks if the connected hardware modules fit the prepared Hardware Configuration in the test. In case of a mismatch it provides information to resolve it.
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PTM 3.50 Features & Improvements for Testing Current Transformers
4.1
New tests for Current Transformers
CT Excitation CT Winding Resistance CT Ratio (Voltage Method) CT Burden
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PTM
What’s New Version 3.40
© OMICRON 2017
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PTM 3.40 – General New Features & Improvements 1. PTM DataSync via Web (additional license required) a. In addition to the existing option to synchronize Locations, Assets, Jobs and Reports from multiple local PTM databases to an SQL server you can now choose to alternatively synchronize to a web Server. b. You can synchronize data via any internet connection c.
Web server maintenance and backup of data will be provided
d. A new license is required to enable synchronization via Web 2. Custom Reports can be added and stored in the PTM database.
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PTM 3.40 Features & Improvements for Testing Transformers
2.1
Dynamic OLTC Scan (DRM)
2.2
Dynamic OLTC-Scan (DRM): measurement and graphical representation of the DC current during switching of an OLTC on all available phases. Filters can be applied for phase, parity of the tap and up or down cycle. Taps may be switched automatically via switchbox or manually. In addition to the measurement curve ripple and slope are shown in a table and in a graph similar to the DC Winding Resistance Test. This feature requires CP SB1. Dynamic shorting can optionally be deactivated for power transformers which have an OLTC on the high-voltage side.
Trending
Historic trend analysis of Power Factor / Dissipation Factor / TanDelta and capacitance for Transformers and Bushings
Available for the following tests o Transformer Overall PF/DF/TanDelta & CAP o Transformer Bushing C1 o Transformer Bushing C2 o Spare Bushing C1 o Spare Bushing C2
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2.3
Firmware for HGT1 Firmware for HGT1 is now installed onto the hard disk during setup of PTM.
2.4
FRANEO 800
2.4.1
New features
2.4.2
Import and export of CIGRE WG A2.26 data formats Import and export of IEC 60076-18 data formats Import of Megger FRAX Version 2.5 test files Bug-fixes Import of Doble SFRA test files: “Imported 0 Files“ issue has been fixed Calculation of the Winding Assessment Factors according to the DL/T911-2004 for low, medium and high frequency fixed
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PTM 3.40 Features & Improvements for Testing Circuit Breakers
3.1
Usability improvements
3.2
3.3
3.4
3.5
Grouping of measurement traces allows fast graphical result handling. Results and assessment limits are separated to increase the user interface clarity. Failed assessments are highlighted in red. Tooltip provides further information. Redesigned hardware configuration view. Complexity removed by introducing tab view and the possibility to collapse / extend channel configurations. CB MC2 and CBTN3 modules now store and restore their phase assignment. Phase assignments can be edited after the test execution. Seamless CIBANO 500 embedded software update via PTM.
Contact travel feature improvements Automated calculation of Contact Wipe for closing operation travel data. Assessment of numerical contact travel results integrated. Intuitive velocity zone wizard visualizes zone configuration in real time. Contact velocity is calculated for up to eight customizable velocity zones. Velocity zones can be specified using various reference definitions and freely adjustable offset parameters.
Extension of IOB1 functionality Use the IOB1 output channels to supply and measure circuit breaker coils or motors.
Extended motor supply voltage range Motors can now be supplied with negative DC up to -300 V.
Localization CIBANO 500 device website now available in Chinese language.
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3.6
Test plan templates in Guided Workflow Circuit breaker test jobs in Guided Workflow can be stored as templates. Test plans in Guided Workflow can be loaded from existing templates. Dedicated template editor available to organize circuit breaker templates and define favorites.
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CPC 100 Toolset 3.40 – New Features and Improvements
4.1
Completely reworked CP CU1 Templates:
For all reworked templates: Improved printing area and ability to disable cell color for print out. Line Impedance Template: o Distance Relay Performance Check: This tool allows to enter the relay’s present parameters and shows the actual zone reach for all possible fault combinations based on the line impedance test results. This helps to illustrate the effect of wrong parameterization in a straightforward way. Mutual Coupling Template: o This template also features the Distance Relay Performance Check. o Template now calculates the k-factor for four different cases: no mutual coupling present, parallel line in operation, parallel line grounded on both ends, fault fed via parallel line. Ground Impedance Template: o Allows selection of applied Standard (IEEE 80 or EN 50522). o Allows consideration of complex reduction factor for correction of the ground impedance’s phase angle. Step & Touch Voltage Template: o This template now allows automated assessment according to IEEE 80 and EN 50522. Reduction Factor Template o Simplification of test procedure o Calculation of the complex reduction factor
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PTM
What’s New Version 3.30
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PTM 3.30 – General New Features & Improvements 1) Copy Job – Use the copy job function to copy the exact job you previously created for a specific asset including selected test list and test settings. Previous measurement results of the original job will be cleared in the copied job. The job can only be copied for the asset of the original job. 2) Copy Test – Copy a test within a job in the guided or manual workflow. All test settings, hardware configurations and assessment limits will be copied. Previous measurement results of the original test will be cleared in the copied test. 3) Screenshots as Attachments in Report – Take a screenshot of a user defined clipping of your PTM screen (e.g. result plot, wiring diagram, test settings). The screenshot will be added to the list of attachments within a test and can be included in the report. 4) Automatic Update Notification – From now on users will be automatically notified once a new PTM version is available for download in the customer area of our website.
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PTM 3.30 Features & Improvements for Testing Transformers 1) Sweep Frequency Response Analysis (SFRA): measurement and graphical representation of the sweep frequency response of power transformers using FRANEO 800. Fully compliant measurement line generation using predefined templates according to IEC 60076-18 and IEEE C57.149-2012 standards. Advanced visualization and analysis of measurement data according to DL/T911-2004 and NCEPRI. Smooth migration of FRAnalyzer 2.2 data to PTM. Import filters for foreign data formats. 2) Dynamic OLTC-Scan (DRM) – Beta Version: measurement and graphical representation of the DC current during switching of an OLTC on all available phases. Filters can be applied for phase, parity of the tap and up or down cycle. Taps may be switched automatically via switchbox or manually. In addition to the measurement curve ripple and slope are shown in a table and in a graph similar to the DC Winding Resistance Test. This feature requires CP SB1 and is only available as a Beta Version. If you wish to use the feature during the trial period please contact us at:
[email protected].
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PTM 3.30 Features & Improvements for Testing Circuit Breakers 1) Increased EtherCAT Performance – Faster detection of EtherCAT accessories. Measure timing and contact resistance of up to 24 main contacts at the same time. 2) Support of EtherCAT Hub EHB1 – More flexibility through EtherCAT hub. Add as many EtherCAT ports to your test system as required. Use EtherCAT hub to reduce wiring effort. 3) Improved Test Configuration – Assessment limits such as allowed coil current ratings or minimum coil pickup voltages can be defined on the level of the asset nameplate and re-used for all further tests. Tests are suggested for different circuit breaker types. Entries in circuit breaker tests are pre-filled with asset nameplate data. 4) Additional Contact Travel Calculations – Over-travel and rebound values are added to numerical results. Up to eight customizable average speed zones can be added. 5) Range of Coil Supply Voltage Increased - Timing tests are extended to also support negative coil supply voltages.
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PTM 3.30 Features & Improvements for Testing Current Transformers 1) Revised asset nameplate to include multi-ratio current transformers and support of IEC 61869 2) Extended CT ratio test to support multi-ratio current transformers 3) Miscellaneous improvements to CT PF/TanDelta & CAP test
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CPC 100 Toolset 3.30 – New Features and Improvements 1) New dynamic OLTC-Scan (DRM) test – Beta Version 2) New temperature compensation for aluminum in Rwind, TapCheck and OLTC Scan (DRM) Tests 3) Fix of TapCheck for EFL - incompatible tap naming 4) Fix of estop-problem: red light keeps flashing upon device deactivation 5) Fix in Rwind Test: no discharging on wiring errors
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CPC Toolset
What’s New Version 3.20
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PTM 3.20 – General New Features & Improvements 1) PTM DataSync (additional license required) a) Synchronize Locations, Assets, Jobs and Reports from multiple local PTM databases to one central SQL server database b) Synchronized data from the server will be available in the field to use for comparison and analysis c) Get automatic updates on Locations, Assets, Jobs and Reports created by other PTM users within your company d) Subscribe to a subset of the server database and get updates only for the data relevant to the individual user e) Increase the safety of your data by creating backups from one central server database 2) Choose the order in which columns are displayed in the Manage view. Drag & Drop the individual columns where they should be displayed as shown for the “Asset” column in the example below.
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PTM 3.20 Features & Improvements for CPC 1) Testing of Transformers a) Automatically assess Leakage Reactance Test results according to industry guidelines b) Perform Turns Ratio measurements on Transformers with unconventional vector groups (e.g. Phase Shifter) according to IEC 61378-1 without the automatic Tap Changer control of the CP SB1 (CP SB1 still required)
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CPC Toolset 3.20 – New Features and Improvements 1) Demag: Improvements of the output-signal stability 2) TRTapCheck: Improved the overcurrent error on discharge behavior 3) VectorGroupCheck: New Connection Check implemented 4) RWinding: Improvements of the output-signal stability and wiring checks
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CPC Toolset
What’s New Version 3.10
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PTM 3.10 – General New Features & Improvements 1) Import and export Location and Asset Data by using Microsoft™ Excel™ Template provided in PTM 2) Export Test Result Data from PTM into Microsoft™ Excel™ format using the PTM Excel Converter a) The PTM Excel Converter has to be installed separately from PTM. Once installed it can be launched out of PTM via Export button in the Manage View. b) In order to use this new feature Microsoft™ Excel™ 2007 or a later version is required c) PTM Excel Converter is only available for the current PTM version and cannot be used with any previous versions of PTM
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PTM 3.10 Features & Improvements for CPC 1) Testing of Transformers a) Use the full automatic mode of PTM to perform Turns Ratio measurements on Transformers with unconventional vector groups (e.g. Phase Shifter) according to IEC 61378-1
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CPC Toolset 3.10 – New Features and Improvements 1) TRRatio: IEC 61378-1 now supported in half automatic mode (CP SB1 with manual tap operation) 2) TRTapCheck: Automatic Tap Cleaning Sequence more interactive 3) Added new test card Vector Group Check to automatically determine the transformer’s vector group using the CP SB1.
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New Handheld Grounding Tester (HGT1) Accessory for Step and Touch Voltage Measurement with the following improvements available (successor of current CP AL1) 1) Higher sensitivity (100 times more sensitive than the CP AL1) 2) Automatic recording of measured values referred to a measurement point. No need to note the values on a paper sheet or something similar. Values are exported as .txt-file and are imported by a dedicated Excel template. 3) Practically unlimited memory for measured values (Micro SD Card with 4 GB). 4) Input Impedance is selected via firmware. Means the device's hardware has been adapted to our needs by including the different input impedance settings. There is no separate adapter anymore. 5) As a result of this, the input impedance is also recorded which allows backtracking of the input impedance settings.
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CPC Toolset
What’s New Version 3.00
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PTM 3.0 – General New Features & Improvements a) PTM is now compatible with Windows 8 & 8.1 operating systems b) PTM is now the combined PC Software for CPC and CIBANO 500 c) In the Manage area of PTM you can now duplicate asset nameplates - a fast and easy way to create new assets with similar nameplate values d) Document and distinguish between the designated Feeder and Phase for current transformer, voltage transformer and miscellaneous assets e) Attach additional measurements records in any kind of format to an existing job to keep all tests, also the ones which are not directly supported, organized in the PTM database (e.g. DIRANA .drax, FRAnalyzer .fra/.tfra, SF6 gas quality report) f)
2 2.1
PTM now also offers the user interface in Russian
PTM 3.00 Features & Improvements for CPC General >
2.2
2.3
Testing of Transformers >
Automatically assess the test results while measuring 1) Overall Tan Delta / PF & Cap 2) Bushing Tan Delta / PF & Cap C1, C2 3) DC Winding Resistance Tests
>
Compare measurement results to previous tests by overlay in the same diagram 1) Overall Tan Delta / PF & CAP 2) Bushing Tan Delta / PF & CAP C1, C2, Energized Collar 3) Surge Arrester Watt Losses 4) Turns Ratio (TTR) 5) DC Winding Resistance
>
Demagnetize transformers using a new test in PTM
>
Document Oil Analysis results of main and tap changer compartments and keep them organized together with the electrical tests in the PTM database.
Testing of Circuit Breakers >
2.4
New Manual Control Mode available for Tan Delta / PF & Cap tests on any kind of asset
Compare measurement results to previous tests by overlay in the same diagram 1) Bushing Tan Delta / PF & CAP C1, C2, Energized Collar
Testing of Spare Bushings >
© OMICRON 2017
Compare measurement results to previous tests by overlay in the same diagram 1) Overall Tan Delta / PF & Cap 2) Bushing Tan Delta / PF & CAP C1, C2, Energized Collar
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CPC Toolset 3.0 – New Features and Improvements a) Added new test card for Demagnetization of Power Transformers b) TR Ratio: IEC 61387-1 support for Transformer Ratio with unconventional vector groups c) Improved performance characteristics of the CP TD1 d) The Polish language is now fully integrated in the embedded CPC software e) Minor improvements were done at several test cards, e.g.: > TR TapCheck: Automatic Tap Cleaning Cycles > TR Ratio: Assistance to fill out the Transformer Ratio Table > VT Burden: included correction factor "1/3"
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For more information, additional literature, and detailed contact information of our worldwide offices please visit our website. www.omicronenergy.com
Subject to change without notice.
