CT Analyzer Brochure English
Contents
1. with OMICRON s patented variable frequency method BENEFITS FOR TESTING METERING CLASS CTS need for external burden box Extremely high accuracy without external reference CT e Automatic calculation of Ratio Correction Factor RCF High noise immunity for on site testing full accuracy available in Advanced Package Burden dependent ratio and phase error results without the Automatic class assessment based on IEC IEEE standards POWER Current ratio error in at of rated current Data type 100 120 200 ring value A 0 010 0 009 0 008 oat va 3 0 010 0 009 0 008 ring va 0 004 0 003 0 002 oat va 0 004 0 003 0 002 ring va 0 000 0 001 0 001 oat va 0 000 0 001 0 001 0 007 0 005 0 004 0 003 0 004 0 007 0 005 0 004 0 003 0 004 Phase displacement in min at rated current 1 5 10 20 120 200 10 16 0 16 0 08 0 08 0 20 0 20 0 18 oat value 1 04 0 82 0 70 0 57 0 39 0 28 0 25 0 18 Burden dependent ratio and phase error results AUTOMATIC ASSESSMENT Determining whether or not a CT complies with a relevant international standard requires the measurement and or calculation of many different CT parameters and a lot of experience The core of OMICRON s collected expertise is included in the CT2. CT Analyzer The Revolution for Current Transtormer Testing and Calibration diid n OMICRON g 4 AA OMICRON World Leader in Innovative Power System Testing Solutions THE UNIQUE CT ANALYZER OMICRON s CT Analyzer delivers a unique capability for the fast comprehensive testing and calibration of current transformers for protection and metering engineers as well as CT switchgear and transformer manufacturers The equipment provides automatic testing and calibration for all types of low leakage flux current transformers both on site in the power system as well as in production facilities and test labs of manufacturers A wide range of measurement functions can be provided e Measurement of CT ratio and phase angle accuracy with consideration of nominal and connected burden CT phase and polarity measurement e CT winding resistance measurement CT excitation saturation recording Secondary burden measurement Transient behavior measurement for CTs where this behavior is defined such as TPS TPX TPY and TPZ The CT Analyzer is the first device that can carry out this test Determination of accuracy limiting factor ALF instrument security factor FS secondary time constant Ts remanence factor Kr transient dimensioning factor Ktd knee point voltage current class saturated and non saturated inductance FEATURES amp BENEFITS Extremely small
3. Test has to be performed for each desired burden value Determination of the knee point voltage is limited to the available output voltage METHOD Il PRIMARY CURRENT INJECTION does not consider burden um uitaple for on site calibration V knee point limited CT as a black box ADVANTAGES OVER METHOD Small test device Easy to use DISADVANTAGES Unless a burden box is used burden is not considered and no burden dependent results can be obtained e g ratio FS ALF etc No assessment to relevant IEC or IEEE standards is possible Cannot be used for on site calibration Determination of the knee point voltage is limited to the available output voltage METHOD III SECONDARY VOLTAGE INJECTION OMICRON METHOD IV CT ANALYZER EXPERT MODELING CT as a black box ADVANTAGES OVER METHOD Small test device Easy to use DISADVANTAGES Burden is not considered therefore the test does not allow an assessment of burden on CT ratio and phase accuracy nor accuracy limiting factor or instrument security factor does not consider burden Tests normally take place at nominal frequency and are therefore depending on electrical noise as the measured primary voltage has very low values especially critical for measurements in substations or power plants unsuitable for on site calibration No burden dependent results can b
4. USA Tel 1 713 830 4660 1 800 OMICRON Fax 1 713 830 4661 info omicronusa com www omicronusa com Asia Pacific OMICRON electronics Asia Ltd Suite 2006 20 F Tower 2 The Gateway Harbour City Kowloon Hong Kong S A R of China Tel 852 2634 0377 Fax 852 2634 0390 info asia omicron at www omicron at Europe Middle East Africa OMICRON electronics GmbH Oberes Ried 1 A 6833 Klaus Austria Tel 43 5523 507 0 Fax 43 5523 507 999 info omicron at www omicron at OMICRON L144 Subject to change without notice Last update October 2009
5. all classes Standard Package classes 0 3 0 5 or higher according to IEEE C57 13 IEC 60044 1 Protection CTs Advanced Package all types Standard Package all protection classes defined in IEEE C57 13 1993 and all conventional types defined in IEC 60044 1 such as 5P 10P PX PR CTs with defined transient behavior according to IEC 60044 6 only with Advanced Package CT ratio up to 99000 1 or 5 CT knee point 1mV 30kV Advanced Package 1mV 4kV Standard Package CT nominal frequency 16 400 Hz Ratio accuracy for O VA up to rated power ratio 1 2000 0 02 ratio 2000 5000 0 03 ratio 5000 10000 0 05 Phase measurement Resolution 0 1 min Accuracy 1 min cos 0 8 1 Winding resistance measurement Resolution 1 mQ Accuracy typical 0 05 guaranteed 0 1 1 mQ Supply voltage Nominal voltage 110 240 V 10 50 60 Hz 500 VA Permissible range 85 265 V User interface Display readable in bright sunlight Operation numerical keyboard and functions keys Data storage amp transfer to PC Card type Compact Flash card Mechanical data Weight 8 kg 17 4 lb without accessories Dimensions W x H x D 360 x 285 x 145 mm 9 2 x 7 2 x 3 7 Inch OMICRON Sales Service Centers Americas OMICRON electronics Corp USA 12 Greenway Plaza Suite 1510 Houston TX 77046
6. Analyzer The CT Analyzer is designed to accurately determine and display all relevant parameters compare the measured results to the requirements of the selected standard and to deliver an automatic assessment of the CT s compliance within seconds The CT Analyzer is the first device with such capabilities Automatic measurement calculation of parameters Ratio up to 99 000 1 Current ratio error and phase error for all measurement points defined in selected standard e Winding resistance Excitation saturation voltage current Secondary burden Saturated inductance Ls Unsaturated inductance Lm Remanence flux factor Kr Secondary time constant Ts Accuracy limiting factor ALF ALFI Instrument security factor FS FSi Dimensioning factor according to class PX TPS Kx Accuracy limiting voltage current according to class PX Ek le Turns ratio according to class PX N Turns ratio and composite error et ec Rated symmetrical short circuit current factor Kssc Transient dimensioning factor Ktd Peak instantaneous error Maximum emf voltage Emax calculated value Accuracy limiting voltage current Val lal Secondary terminal voltage rating Vb Knee point voltage current Vkn Ikn OMICRON BENEFITS FOR TESTING PROTECTION CLASS CTS 100000 e Excitation saturation testing with safe voltages max 120Vac using patented variable frequency method 10000 i Beal e Testing wit
7. put into service without the need to contact the manufacturer The CT Analyzer then performs a complete CT test and ascertains all relevant parameters using patented technology Parameters determined include type measurement or protection class ratio nominal and operating burden cos l winding resistance and knee point of the CT In addition the current ratio error and the phase error are determined at nominal burden for different currents and powers both given in percent of their rated values SIMULATION FOR DIFFERENT BURDENS AND CURRENTS Existing measurement data can be loaded at any time to re calculate the test results for different burden values and primary currents This way no further on site measurements are necessary to verify whether a changed burden influences the behavior of a CT Recalculation of ratio and phase accuracy for defined burden and current values based on the CT Analyzers measurement results of a CT can also be performed on a PC with an Excel application which is part of the delivery Thus re calculation of the test results can easily be performed back in the office using the existing test reports MULTIMETER WITH INTEGRATED SOURCE QUICKTEST Test engineers often need to perform manual tests for trouble shooting or quick verification purposes QuickTest allows the CT Analyzer to be used as a multimeter with integrated current or voltage source With QuickTest the CT Analyzer can perfor
8. LF It also calculates the accuracy limiting factor according to the connected burden known as the ALFi and assesses whether the CT meets Its nameplate specification This helps the relay engineer to determine on site whether the CT meets the protection design criteria The excitation saturation voltage of a protection CT can range from hundreds of volts to more than ten thousand volts Testing at these high voltages requires special safety procedures and considerations The CT Analyzer uses a variable frequency low voltage method for the excitation saturation test If the voltage required is higher than 120 Vac then the frequency is reduced to achieve the same level of excitation The final results are then transformed back to the nominal frequency This method allows testing of a protection CT with a very high knee point voltage at safe voltage levels therefore lowering the safety risk to the operator In special relay applications a protection CT with a specified transient behavior according to IEC 60044 6 can be used e g TPY TPZ The CT Analyzer is the first device that can automatically test and assess whether the CT complies with this standard thereby indicating if its characteristics are appropriate for the relaying application TESTING A MEASUREMENT CT TO ACCURACY CLASS 0 1 Ratio errors arise because a proportion of the primary current magnetizes the core instead of being transferred to the secondary winding Electricity meters ca
9. and lightweight lt 8 kg 17 Ib particularly beneficial for on site testing e Reduced commissioning time due to fully automatic testing Results within seconds Calibration of measuring transformers A typical accuracy of 0 02 1 enables field calibration and verification of class 0 1 CTs for metering Allows testing of CTs for power frequencies from 16 to 400 Hz Automatic parameter search and analysis of CTs with unknown data High level of safety all tests use low voltages 120 V e Automatic creation of test report in ten selectable languages Precise measurement of ratio error and phase displacement up to x times the rated current and for all burden values without the need to connect burden hardware independent of the application e g bushings and GIS Test of CTs with very high knee point voltages up to 30 kV Automatic demagnetization of the CT after the test STANDARD COMPLIANCE The CT Analyzer can automatically assess whether or not a CT complies with the applicable international standard thereby indicating if the characteristics of the CT are appropriate for its application Automatic assessment Is available according to e Institute of Electrical and Electronics Engineers IEEE standard IEEE C57 13 1993 Standard Requirements for Instrument Transformers e International Electrotechnical Commission IEC standards IEC 60044 1 Instrument Transformers Part 1 Current Transformers and IEC 60044 6 Ins
10. culation of Ktd with OMICRON and without remanence IEC 60044 6 ORDERING INFORMATION OMICRON ADVANCED PACKAGE VE000654 Standard Package plus additional options as detailed on opposite page STANDARD PACKAGE VE000656 CT Analyzer with standard set of accessories see table below QuickTest Upgrade VESM0652 QuickTest software license upgrade for firmware versions prior to v3 50 ACCESSORIES PART OF STANDARD amp ADVANCED PACKAGE SCOPE OF DELIVERY Coax cables with banana plugs 2x3 m 1x10 m Battery clamps with 4 mm banana sockets for primary Grounding PE cable 1x6m 6 mm2 for protective VEHK0651 side connection earth connection VEHZ0652 VEHK0615 Crocodile clamps Flexible terminal USB RS232 for secondary side connection with adapters with 12 x 4mm banana A converter cable with Nullmodem cable Calibration CT 2000 1 2000 5 class 0 02 banana plugs 3m VEHK0654 6m VEHK0652 wheels VEHPO068 4 mm banana sockets f socket VEHZ0014 20 mm opening Pai VEHS0009 width 2 x red 2 x XX black VEHZ0656 Compact Flash card USB 2 0 Compact Power cord country 128 MB for at least Flash card reader country dependent dependent 416 test reports VEHZ0655 of memory space VEHZ0654 User manual CT Analyzer CT Analyzer PC VESD0605 z carry bag software tools
11. e obtained e g ratio FS ALF etc No assessment to relevant IEC or IEEE standards is possible Cannot be used for on site calibration Determination of the knee point voltage is V knee limited to the available output voltage point limited CT as an electrical model j Aida I I i l I 1 Definition of CT model elements with variable frequency 2 Calculation of CT parameters through embedded mathematical functions ccs ELA T d Ve t V t Rerler O Vir V V Rerler t di ADVANTAGES OVER METHOD 8 kg Small test device Easy to use ADVANTAGE OVER METHOD III Independent from mains frequency CTs for export to countries with different mains considers frequency can easily and precisely be measured burden Mains frequency noise is suppressed ideal for on site measurements ADVANTAGES OVER METHODS II amp IIl DETERMINA TION OF ALL THE ELEMENTS IN THE CT MODEL From the CT model ratio and phase accuracy can suitable be determined for any burden burden box is not for on site needed calibration Many parameters defined in the relevant IEC and IEEE standards can be measured and assessed e g FS ALF Kr eC Kssc Ktd Can be used for on site calibration verified by E German National Metrology Institute PTB point up to 30kV Very high knee point voltages up to 30kV can be measured with low output voltage
12. et VEHP0018 remote control a software QuickTest Excel File Loader etc VESMO800 ADDITIONAL ACCESSORIES Training CT 300 5 Coax cable with Pluggable 23 turns class 0 5 FS 5 Kelvin clamps 3 m winding VEHK0658 VEHZ0643 VEHK0657 O CT Analyzer Coax cables with Transport case with VEHZ0649 10m VEHK0653 15m VEHK0655 100m VEHK0656 11 OMICRON is an international company serving the electrical power industry with innovative testing and diagnostic solutions The application of OMICRON products provides users with the highest level of confidence in the condition assessment of primary and secondary equipment on their systems Services offered in the area of consulting commissioning testing diagnosis and training make the product range complete Customers in more than 130 countries rely on the company s ability to supply leading edge technology of excellent quality Broad application knowledge and extraordinary customer support provided by offices in Europe North America South and East Asia and the Middle East together with a worldwide network of distributors and representatives make the company a market leader in its sector With its policy of pioneering development OMICRON continues to lead the field in creating solutions to meet the needs of 21st century customers TECHNICAL DATA CTs that can be measured with the CT Analyzer Measurement CTs Advanced Package
13. h actual burden connected at site verification of 1000 CT performance under actual conditions Es V e Testing of transient parameters for TPS TPX TPY TPZ CTs P A HHH A A a i ee TE e Testing of high knee point voltages of up to 30 kV cre e High noise immunity for on site testing e comme Seres mite I kn V Kn a l kn2 V kn2 High knee point voltages of up to 30 kV available in Advanced Package D Comparison of results to standard Automatic assessment NORME CEI INTERNATIONALE IEC INTERNATIONAL 60044 1 Standard RO 1 STANDARD ston t menemen E E E C 5 1 3 bellied Cees mermi ee roter OO eet OE 2 Transformtesrs Portie 1 NERTIR NORME CEI instrament trana INTERNATIONALE IEC cueuad inert INTERNATIONAL 44 6 STANDARD oes RSQ 104 rel Teansicema proces ere Results shown on the Assessment Card on rege ae e inetreners t Port 6 IEEE Standard Requirements for Hew mate se Instrument Transformers SSeS renret veoh tow Guprartien woms a teh Sine ints ond onewe Caprag E DR by Gee ieee of eames ond Emre mes Reger bee Align morad Pubes Ord Fd pee AAA pen tn ad be pradanda m RW Oe olen eT TAT NE OR he Fe er perme tee oe pene phe IEC 60044 6 GUESSING NAMEPLATES If the nameplate data are no longer available the CT Analyzer can determine that data if It is correctly connected to the CT Thus an older CT can confidently be
14. m a wide variety of measurements which are usually necessary for fault finding measurement of L Z ratio polarity burden etc QuickTest is also available as a PC tool The QuickTest Interface was added to the CT Analyzer packages in 2009 Users who purchased CT Analyzer at an earlier date can upgrade their device with a QuickTest license Part of the Advanced Package GRA Resi Exci Ra Asse Cor Eo E e EEE A E T Clear m See Zaye 1 00548 O06 O 02VA Cosy 15 59m lt ETA QuickTest El x File Dei Paauaten ciptons 7 Advanced CT Fists WT Fala Alschtsrce Lace Flgeetance Output Hode wr ac DC OFF y Amphiude 1 00 y Frequencar fl no Hz OFF gt Measaemert bode Regdation Parameter DE Inducitre Load Ras A LOO f Frequerecsy calecins Bandwidth r Hz L enor H Mesmuremeni PRIH 0 0 159 0400 uy 2 1000 pi 1 6069 m4 JFET mi 6 23159 mY 4 0304 mA KES EHE mi 2 0572 mes Adamy AE mi A d25d m SEC 3 Oddity tardd oh 995 6rnl BE 6 232mnM pe a rd ara Esl EN Heas emenk in proge Likens avalible OMICRON NETWORK SIMULATION Correct CT parameters are often required for accurate modeling of power systems in network studies and simulation testing of protection relays NetSim is a software tool for network simulation using OMICRON s three phase rela
15. n only measure the signals they receive from a measurement CT and so depend on Its accuracy The accuracy class of a measurement CT has been defined in the relevant international standards depending on the installed burden and the actual percentage of the nominal current The CT Analyzer is the first device that can automatically determine whether the performance of the CT is compliant with the relevant IEC or IEEE standard Its high accuracy enables the testing of measurement CTs of all accuracy classes on site including classes 0 1 and 0 2 When the magnetic flux within a CT reaches a certain value its core will saturate Saturation protects a measurement device against heavy overcurrents Thus It is critical for the safety of the device that the actual burden is known The CT Analyzer is the first device that can automatically determine the ratio error and the instrument security factor FS FSi for all load conditions METHOD I PRIMARY NOMINAL CURRENT INJECTION CT as a black box current source amp meters phase meter reference CT burden box etc considers burden suitable for on site calibration V knee point limited ADVANTAGES OVER METHODS II amp Ill Precise results as magnetic losses are accounted for Can be used for on site calibration DISADVANTAGES Time consuming Alot of equipment is involved Requires heavy equipment such as large cables current booster equipment etc
16. port is available in ten different languages selectable by the user So for e g project companies it is easy to provide the test report in their clients language independent in which language the test was performed The templates can be modified by the customer Included report templates STANDARD PACKAGE e On Site Off Site Measurement of all types of protection CTs with connected burden all types of measurement CTs bushing CTs and CTs within a GIS CTs considering the connected burden e Automatic assessment of compliance with IEC 60044 1 and or IEEE C57 13 for CTs of classes gt 0 2 Features CT ratio measurement with consideration of nominal and connected secondary burden CT phase and polarity measurement CT excitation saturation characteristic recording CT winding resistance measurement Secondary burden measurement Measurement of ratio ratio error and phase displacement at currents of up to 400 the rated value and for different burdens without the need to re connect burden hardware independent of the application e g bushings and GIS Determination of the following CT parameters Accuracy limiting factor ALF Instrument security factor FS Secondary time constant Ts Remanence factor Kr Knee point voltage current Saturated and non saturated inductance Assessment according to defined standards IEC 60044 1 and or IEEE C57 13 Small and ligh
17. trument Transformers Part 6 Requirements for Protective Transformers for Transient Performance OMICRON TESTING AND ASSESSING A PROTECTION CT A protection CT is used to produce a secondary current proportional to the actual current flowing in the power system This is then used as an input signals to the system protection The magnitude of the current may range from several milliamps to up to 30 times the rated current In order for a relay to operate properly the protection CT must have a linear characteristic over its specified operating range The CT can be driven into saturation by too much primary current excessive secondary burden or currents with a high dc offset e g transformer inrush current Since the operation of the relay can become unpredictable during CT saturation the excitation or saturation characteristic of the CT is a very important consideration for the relay engineer A protection CT is specified by an accuracy limiting factor ALF which the relay engineer can use to choose the correct CT for the application The ALF is determined by the excitation saturation characteristic of the CT its winding resistance and the secondary burden resulting from the connecting leads and the attached relays It is therefore important to measure all of the parameters and determine the ALF for a particular connected burden The CT Analyzer automatically measures these parameters and determines the value of the A
18. tweight lt 8 kg 17 Ib Short testing time due to fully automatic testing with results in seconds Allows testing of CTs for power frequencies from 16 to 400 Hz High level of safety due to using low voltages for all tests max 120 V with patented variable frequency method Measuring CTs with knee points from 1 mV up to 4 kV Automatic demagnetization of the CT after the test Nameplate guesser function for CTs with unknown data see page 8 QuickTest see page 8 Remote control interface see page 9 Display readable in bright sunlight 10 ADVANCED PACKAGE e All options of the standard package plus e Automatic assessment of compliance with IEC 60044 1 and or IEEE C57 13 for CTs of accuracy classes 0 2 and 0 1 with IEC 60044 6 for CTs with defined transient behavior Features e All options of the STANDARD package plus e Automatic assessment according to IEC 60044 1 and or IEEE C57 13 for CTs of all accuracy classes including 0 2 and 0 1 Simulation of measured data with different burdens and currents see page 8 Measurement of the transient behavior of CTs where this behavior is defined such as TPS TPX TPY and TPZ according to IEC 60044 6 Measurement of knee point voltages of up to 30 kV e Automated determination of transient dimensioning factor Ktd Kif ip Kat acc 44 6 _ Ktd Omicron Ktf OMICRON timeins Automated cal
19. y test sets CT Analyzer can export its measurement data to NetSim which then builds its simulation on measured CT data instead of just nameplate data values This is especially useful in analyzing the behavior of protective relays due to CT saturation a et ng REMOTE CONTROL FOR FULL PRODUCTION INTEGRATION With the remote control it is possible to integrate the device in a fully automated test environment The device can be completely controlled from a PC A test can be defined started and the results can be imported back into Excel where customer specific test reports and templates can be prepared The remote control also allows for writing a customer specific user interface For an easy start with creating the remote interface working samples are delivered with the device in Visual Basic and C REPORTING All results are saved on a removable Compact Flash card and can be transferred to a PC for further processing viewing and printing e g Excel Word Microsoft HTML Excel Report templates are available for different standards classes and applications including single core CTs multicore CTs or three phase test Via the templates the user interface and report language can be changed instantly e g for testing in one language and printing in another The test re
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