NXCT 345 kv Test Performance Record For LAPEM
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1 2005 NxtPhase T&D Corporation 2635 Lillooet St. Vancouver, Canada, V5M 4P7 Tel: Fax: NXCT 345 kv Test Performance Record For LAPEM
2 Information in this document is subject to change without notice NxtPhase T&D Corporation. All rights reserved. Reproduction in any manner whatsoever without the written permission of the NxtPhase Corporation is strictly forbidden. This document is part of the complete set of product documentation that includes detailed drawings, installation, operation, service and maintenance manuals, and acceptance test results. Users should evaluate the information in the context of the complete set of product documentation and their particular applications. NxtPhase assumes no liability for any incidental, indirect, or consequential damages arising form the use of this documentation. While all information presented is believed to be reliable and in accordance with accepted engineering practices, NxtPhase makes no warranties as to the completeness of the information. All trademarks used in association with NXCT, NXVT and NXVCT are trademarks of NxtPhase T&D Corporation NxtPhase T&D Corporation Page 2
3 Contents Chapter 1: NXCT System Overview Chapter 2: IEC Requirements and Test Results...6 Appendix A: NXCT Gen 3.0 Project, Current Transducer System for Metering and Protection Applications, EMC Compliance Test Report D00559R NxtPhase T&D Corporation Page 3
4 Preface About this Document The NXCT-345 kv was tested for conformance with international engineering standards. For a list of standards to which the NXCT system conforms, please refer to the Industry Standards section in this manual. This document contains summaries of the results of the testing conducted on the NXCT system and copies of the original test reports. The document is formatted to flow easily through the required tests of the IEC Each section begins with the IEC Standard text, followed by a summary of the applicable test results, and ending with a copy of the original, signed test report. Related Documentation The complete set of manuals consists of the following Documents: NXCT Installation, Maintenance and Operation Manual D00352R01.01 NXCT Product Drawings Manual D01702R01.00 NXCT Type Test Report D01700R00.01 Note: Information updates and supplementary drawings related to the NXCT system will be provided as required. These supplementary documents should be consulted first as they will contain the most current information. NxtPhase Customer Support For further assistance, contact NxtPhase Customer Support at: Tel: (604) support@nxtphase.com 2005 NxtPhase T&D Corporation Page 4
5 Chapter 1: NXCT System Overview Introduction The NXCT system is built according to stringent electronic and electrical industry standards and/or codes. Important environmental and safety features are also included in the system design. Before leaving the NxtPhase factory, each NXCT system is tested to ensure the system meets a set of performance standards to ensure reliable field operation. The type test reports provide evidence of the type tests, results, and these test documents are important reference documents. Future performance tests may be compared to these benchmarks for maintenance, calibration and other similar routine activities. Industry Standards The NXCT is built according to relevant standards published and maintained by the following institutes: International Electro-technical Commission (IEC): International IEC , 2, 3, 4, 5, 6, 7, 8 IEC IEC IEC , -3, -4, -5, -8, -9, -10, -12, -29 IEC CISPR 11 Institute of Electrical and Electronic Engineers (IEEE): North America IEEE C IEEE C37.92/D8.4 IEEE C37.90 IEEE Canadian Standards Association (CSA): Canada. CAN3-C13-M NxtPhase T&D Corporation Page 5
6 Chapter 2: IEC Requirements & Test Results General Comments on NXCT Type Tests: Only the insulator and accompanying corona rings change between voltage classes in the NXCT design, the optical circuit remains the same. The metrology components or components that would effect metrology do not change in the NXCT design between voltage classes. Thus, the type tests applicable to the optical design on a unit in one voltage class are used to claim compliance to the standards for all voltage classes. 1. Classifications of Tests The IEC Standards Requirements The IEC Ed. 1: Instrument transformers Part 8:Electrical Current Transducers, Clause 7 defines the classifications of tests as follows: 7 Classification of tests 7.1 General The tests specified in this standard are classified as type tests, routine tests, and special tests. Type test: A test made on an electronic current transformer of one type to demonstrate that all electronic current transformers made to the same specification comply with the requirements not covered by routine tests. The validity of a type test, which has been made on a transformer, which has minor modifications, or a type test made on an unmodified subassembly shall be subject to agreement between manufacturer and purchaser. Routine test: A test to which each individual electronic current transformer is subjected. Special test: A test other than a type test or a routine test, agreed on by manufacturer and purchaser. 7.2 Type tests General type tests The following tests are type tests; for details reference should be made to the relevant subclauses: a) short-time current tests (see 8.1); b) temperature-rise test (see 8.2); c) lightning-impulse test (see 8.3.2); d) switching-impulse test (see 8.3.3); e) wet test for outdoor type electronic current transformers (see 8.4); f) RIV test (see 8.5); g) transmitted overvoltage test (see 8.6); Tests listed a) to g) are high voltage component dependent and will change with the voltage class. h) low-voltage components voltage withstand test (see 8.7) i) EMC tests: emission (see 8.8.3); 2005 NxtPhase T&D Corporation Page 6
7 j) EMC tests: immunity (see 8.8.4); k) accuracy test (see 8.9); l) additional accuracy tests for protective electronic current transformer (see 8.10); m) verification of the protection (see 8.11); n) tightness tests (see 8.12); o) vibration test (see 8.13). All the dielectric type tests should be carried out on the same electronic current transformer, unless otherwise specified. After electronic current transformers have been subjected to the dielectric type tests of 7.2, they shall be subjected to all the routine tests of Additional type tests for digital output a) Verification of the driver characteristics. b) Verification of the receiver characteristics. c) Verification of timing accuracy. The NXCT has only analog outputs. These tests are not applicable. 7.3 Routine tests General routine tests The following tests apply to each individual electronic current transformers: a) verification of terminal markings (see 9.1); b) power-frequency withstand test on primary terminals (see 9.2); c) partial discharge measurement (see 9.2.2); d) power-frequency withstand test for low-voltage components (see 9.3); e) accuracy tests (see 9.4); f) tightness tests (see 9.5). The order of the tests is not standardized, but determination of errors shall be performed after the other tests. Repeated power-frequency tests on primary terminals should be performed at 80 % of the specified test voltage Additional routine tests for digital output The NXCT has only analog outputs. These tests are not applicable Fibre optic transmission a) Measurement of transmission power Copper-wire transmission a) Measurement of signal amplitude at output of line driver NxtPhase T&D Corporation Page 7
8 7.3.3 Additional routine tests for analogue output a) Measurement of secondary direct voltage offset (Usdc0). b) If applicable (ECT powered by line current), measurement of the minimum wake -up current needed to ensure nominal performance of the ECT. c) 7.4 Special tests General special tests The following tests are performed upon agreement between manufacturer and purchaser: a) chopped lightning impulse test (see 10.1); b) measurement of capacitance and dielectric dissipation factor (see 10.2); c) multiple chopped impulse test on primary terminals (see IEC annex B); d) mechanical tests (see 10.3); e) accuracy test versus harmonics (see 10.4); f) tests in accordance with the technology applied (see 10.5). 2. Type Tests - The IEC Standard Requirements The IEC Ed. 1: Instrument transformers Part 8:Electrical Current Transducers, Section 8 states the following required tests: 8 Type test 8.1 Short-time current tests For the thermal short-time current Ith test, the electronic current transformer shall initially be at a temperature between 10 C and 40 C. This test shall be made with the combination of auxiliary power supply voltage and secondary burden which causes the maximum internal power dissipation of the secondary converter, and at a current I for a time t, such that (I 2 t) is not less than (I th ) 2 and provided t has a value between 0,5 s and 5 s. The dynamic test shall be made with the combination of auxiliary power supply voltage and secondary burden which causes the maximum internal power dissipation of the secondary converter, and with a primary current the peak value of which is not less than the rated dynamic current (I dyn ) for at least one peak. The dynamic test may be combined with the thermal test above provided the first major peak current of that test is not less than the rated dynamic current (I dyn ) NxtPhase T&D Corporation Page 8
9 The transformer shall be deemed to have passed these tests if, after cooling to ambient temperature (between 10 C and 40 C), it satisfies the following requirements. a) It is not visibly damaged. b) It withstands the dielectric tests specified in but with the test voltages reduced to 90 % of those given for the primary terminals. c) On examination, the insulation next to the surface of the conductor does not show significant deterioration (for example, carbonization). Acceptance criteria b) and c) may not be relevant depending on the design, for example, electronic current transformer with separated insulator. The examination c) is not required if the current density in the primary conductor, corresponding to the rated short-time thermal current, does not exceed 180 A/mm² where the primary conductor is of copper of conductivity not less than 97 % of the value given in IEC 60028; 120 A/mm² where the primary conductor is of aluminum of conductivity not less than 97 % of the value given in IEC NOTE Experience has shown that in service the requirements for thermal rating are generally fulfilled in the case of Class A insulation provided that the current density in the primary conductor, corresponding to the rated short time current, does not exceed the above-mentioned values. Consequently, compliance with this requirement may take the place of the insulation examination, if agreed between manufacturer and purchaser. Summary of Short-time Current Tests: Test Result: Pass CT Serial #: D0XXXXR Rated Voltage: 345 kv Rated Current: 2000 A Powertech Report Number: Date: 02/03 Test date: 01/21/03 A series of high power tests were performed on the NXCT in accordance with the IEC and documented in Powertech reports. Tests Momentary 179 kapeak Short time 63 karms (1s) Accuracy Original Short-time Current Tests Report: 2005 NxtPhase T&D Corporation Page 9
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12 The IEC Standard Requirements 8.2 Temperature-rise test A test shall be made to prove compliance with the requirements of For the purpose of this test, electronic current transformers shall be deemed to have attained a steady temperature when the rate of temperature rise does not exceed 1 K per hour. The test-site ambient temperature shall be between 10 C and 30 C. For the test, the transformers shall be mounted in a manner representative of the mounting in service. The temperature rise may be measured by thermometers, thermocouples or other suitable device. In the case of an electronic current transformer having more than one secondary converter, the test is to be performed on each secondary converter. The electronic current transformer shall be deemed to have passed this test if a) the temperature rise is in accordance with the rating values given in b) after cooling to ambient temperature, it satisfies the following requirements: 1) it is not visibly damaged, 2) its errors do not differ from those recorded before the test by mo re than half the limits of error to its accuracy class. Summary of Temperature Rise Tests: 3000 A Rating Test Result: Pass CT serial #: D0XXXXR Rated Voltage: 345 kv Rated Current: 2000 A. Powertech report #: REP1 Date: 4/16/03 Test date: 1/24/03 A temperature rise test at 3000 A was performed on the NXCT in accordance with IEC (2002) and IEEE C The results are presented in the table below. Temperature Rise Test Results: Location Maximum Absolute Temperature ( C) Maximum Temperature Rise Above Ambient ( C) Conductor bus (left end) Conductor bus (mid point) Conductor bus (right end) Bottom of CT ring Top of CT ring Accuracy Test Results at 2000 A: Ratio Error Before Test: +0.05% Phase Error Before Test: 0.6 minutes Ratio Error After Test: +0.05% Phase Error After Test: 1.2 minutes 2005 NxtPhase T&D Corporation Page 10
13 4000 A Rating Test Result: Pass, class A CT serial #: D00246R Rated Voltage: 420 kv Rated Current: 2000 A. NxtPhase Doc. #: D00341R00.00 Date: 8/29/03 Test date: 9/21/03 A temperature rise test at 4000 A was performed on the NXCT in accordance with IEC (2002) and IEEE C The NXCT was a protection class CT with a 0.2 V output at rated current. Temperature Rise Test Results: Location Maximum Absolute Temperature ( C) Maximum Temperature Rise Above Ambient ( C) 4 circular bus Top of CT head 32 0 Accuracy Test Results at 2000 A: Ratio Error Before Test: 0.02 ± 0.12 % Phase Error Before Test: -0.7 minutes Ratio Error After Test: 0.13 % ± 0.12 % Phase Error After Test: -0.7 minutes The NXCT passed the temperature rise test at 4000 A rms thermal current with a A class of insulation (60 C temperature rise of the bus) for classes not immersed in oil or bituminous compound according to the IEC industry standard. Original Temperature Rise Test Report: 2005 NxtPhase T&D Corporation Page 11
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15 T1-Other Document TEMPERATURE-RISE TEST (4000 A) Doc #: D00341R00.00 Released Status: Preliminary Author: Allen Rose Approver(s): Eric Hadley, Jim Blake 1. Revision History Revision Revision Date: Sections Description of Change: Revised by: Level: (YYYY-MM-DD) Affected: R all First Document Release AHR 2. Introduction This document reports the results of a temperature-rise test performed on a 2 turn protection NXCT on September 21, The test witnesses are Allen Rose, Eric Hadley, and Jim Blake. The NXCT has a serial number of D00246R Scope The test was performed in accordance with sections 5.1.6, 6.1.2, and 8.2 of the IEC industry standard with a 4000 A rms thermal current. The NXCT was fitted with a standard 4.5 round bus and 4 hole NEMA pad connectors. (See photos below.) 4. Results The NXCT #D00246R passed the temperature rise test at 4000 A rms thermal current with a A class of insulation (60 C temperature rise of the bus) for classes not immersed in oil or bituminous compound according to the IEC industry standard. Scale factor error, measured at the rated current of 2000 A, before test was 0.02% ± 0.12% and after test and cool down, 0.13% ± 0.12%. The actual rise of the bus was 47 C above ambient temperature. The phase offset is about -0.7 and remained constant throughout the test. The performance of the sensor before and after the 4000 A heat rise test did not change within the uncertainty of the measurements. 5. Related Standard Document Number IEC Definitions NXCT DVM Term 7. Test Metrology Title Instrument transformers Part 8: electrical current transducers NxtPhase Current Transducer Digital volt meter Definition The NXCT was tested for scale factor accuracy using a Knopp CT-5000 (with a 0.1Ω burden), Arbiter, and Agilent DVM 3458A. A SRS 530 lockin amplifier was used to monitor the scale factor during the test. AD590 temperature probes provided the temperature readings. The accuracy of the AD590s are ±1 C. The accuracy of the combined Knopp and arbiter is 510 ppm for the current reading. The accuracy of the Agilent 3458A in this test arrangement is about 0.10 %. All instruments are NIST traceable. Total uncertainty on the current ratio or scale factor error is about 0.12 %. C:\Documents and Settings\arose\My Documents\power tech\gen 2\Temperature rise test D00341.doc PROPRIETARY INFORMATION. Do Not Disseminate Without The Consent Of NxtPhase Copyright 2003 Last Saved: 9/11/2003 2:34 PM Page 1 of 4
16 8. Test diagram Transformer Isolated Current Source 4000 A Knopp 5000:1 NXCT 2000 A :0.2 V 0.1 Ω Arbiter DVM Lockin Amplifier with difference amp *The lockin difference amplifier should not be connected to the NXCT output when reading the DVM output. The common mode noise on the NXCT output biases the DVM reading by about 20 mv, because the lockin difference amplifier grounds one side of the NXCT differential output. The DVM should have a filter function of 20 to 100 Hz on. 9. Test Photographs C:\Documents and Settings\arose\My Documents\power tech\gen 2\Temperature rise test D00341.doc PROPRIETARY INFORMATION. Do Not Disseminate Without The Consent Of NxtPhase Copyright 2003 Last Saved: 9/11/2003 2:34 PM Page 2 of 4
17 10. Temperature profile of test The slope of the bus bar temperature from 13.5 to 14.5 hours is 0.45 C/h within the IEC standard of 1 C/h. The test was performed in still air. The head shows no steady state temperature rise above the air temperature with the 4000 A heating current. Temperature ( o C) Temperature rise test data Slope 0.45 o C/h Bus Bar Clamp Base Air Head Time (h) C:\Documents and Settings\arose\My Documents\power tech\gen 2\Temperature rise test D00341.doc PROPRIETARY INFORMATION. Do Not Disseminate Without The Consent Of NxtPhase Copyright 2003 Last Saved: 9/11/2003 2:34 PM Page 3 of 4
18 11. NXCT performance during the heat rise test The scale factor error performance during the test shows that the head temperature rose with the heated air around the current source. The scale factor change shown below represents 10 C differential between the base, and the head. Our sensor is known to exhibit a scale factor sensitivity to this difference of about 200 ppm/ C Scale Factor Error (%) Scale factor error Calibration points Bus Bar Head Temperature ( o C) Time (h) 14 C:\Documents and Settings\arose\My Documents\power tech\gen 2\Temperature rise test D00341.doc PROPRIETARY INFORMATION. Do Not Disseminate Without The Consent Of NxtPhase Copyright 2003 Last Saved: 9/11/2003 2:34 PM Page 4 of 4
19 The IEC Standard Requirements 8.3 Impulse tests on primary terminals General conditions Ambient air Reference is made to IEC regarding standard reference atmospheric conditions and atmospheric factors. For electronic current transformers where external insulation in free air is of principal concern, the correction factor K t shall be applied. For electronic current transformers having external and internal insulation, the correction factor K t shall be applied if its value is between 0,95 and 1,05. However, in order to avoid overstressing of internal insulation, the application of the correction factor K t may be omitted where the satisfactory performance of external insulation has been established. In the case where the correction factor is outside the range of 0,95 and 1,05, details of dielectric tests shall be subject to agreement between manufacturer and user. For electronic current transformers having internal insulation only, the ambient air conditions are of no influence and the correction factor K t shall not be applied Wet test procedure No humidity correction factor shall be applied for wet tests. The wetting procedure shall be in accordance with IEC Condition of electronic current transformers Dielectric tests shall be made on electronic current transformers completely assembled, as in service; the outside surfaces of insulating parts shall be carefully cleaned. The electronic current transformers shall be mounted for test with minimum clearances and height as specified by the manufacturer. Equipment tested at one distance above ground surface level will be deemed to be satisfactory if mounted at a greater distance above ground surface level in service. For electronic current transformers using compressed gas for insulation, dielectric tests shall be performed at minimum functional density p me. The minimum functional density may be expressed as the pressure at the reference temperature of 20 C. If, at the time of the test, the temperature differs from 20 C, the pressure must be adjusted to correspond to the minimum functional density. The temperature and pressure of the gas during the tests shall be noted and recorded in the test report Records The peak value and the wave shape of each impulse shall be recorded Lightning-impulse test In order to comply with , the electronic current transformer shall be subjected to a lightning-impulse test. The test voltage shall have the appropriate value given in tables 3, NxtPhase T&D Corporation Page 12
20 and 5 of IEC depending on the highest voltage for equipment and the specified insulation level. The test voltage shall be applied between the line terminals of the primary current sensor connected together and earth. The frame (if any), the case (if any), and all secondary terminals (if any) shall be connected together and to earth. Improvements in failure detection may be obtained by the recording of an additional quantity. At the option of the manufacturer, the earth connection may be made through a suitable current-recording device; the secondary terminals (if any) may be connected together and earthed or may be connected to a suitable device for recording the appropriate output quantity during the test. NOTE If not specified otherwise, the test shall be performed with the electronic current transformer completely assembled, including the transmission system and secondary converter Primary terminals having U m < 300 kv The test shall be performed with both positive and negative polarities. Fifteen consecutive impulses of each polarity not corrected for atmospheric conditions shall be applied. The electronic current transformer passes the test if no disruptive discharge occurs in the non-self-restoring internal insulation; no flashovers occur along the non-self-restoring external insulation; no more than two flashovers for each polarity occur across the self-restoring external insulation; no other evidence of insulation failure is detected (for example, variations in the wave shape of the recorded quantities). NOTE The application of 15 positive and 15 negative impulses is specified for testing the external insulation. If other tests are agreed between manufacturer and purchaser to check the external insulation, the number of lightning impulses should be reduced to three of each polarity, not corrected for atmospheric conditions Primary terminals having U m?300 kv The tests shall be performed with both positive and negative polarities. Three consecutive impulses of each polarity, not corrected for atmospheric conditions, shall be applied. The electronic current transformer passes the test if no disruptive discharge occurs; no other evidence of insulation failure is detected (for example, variations in the wave shape of the recorded quantities) NxtPhase T&D Corporation Page 13
21 Summary of Lightning-Impulse Test: Test Result: Pass CT serial #: D0XXXXR Rated Voltage: 345 kv Rated Current: 2000 A Powertech reports #: /A; /C, 05/06/03 Test date: 01/28/03 An NXCT with a 345 kv class insulator was tested in accordance with IEC , -7, -2, -1, IEEE C , and CAN3-C13-M83. The following is a summary of the tests performed. Lightning impulse tests 1300 kv - positive polarity 1 reduced and 3 full impulses 1300 kv - negative polarity 1 reduced and 3 full impulse 1450 kv - negative polarity 2 chopped impulses 1300 kv - positive polarity 1 reduced and 2 full impulses Original Lighting Impulse Test Report: 2005 NxtPhase T&D Corporation Page 14
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23 The IEC Standard Requirements Switching-impulse test In order to comply with the electronic current transformer shall be subjected to a switching-impulse test. The test voltage shall have the appropriate value given in table 4 of IEC , depending on the highest voltage for equipment and the specified insulation level. The test voltage shall be applied between the line terminals of the primary current sensor connected together and earth. The frame (if any), the case (if any), and all secondary terminals (if any) shall be connected together and to earth. At the option of the manufacturer the connection to earth may be made through a suitable current recording device the secondary terminals (if any) may be connected together and earthed or may be connected to a suitable device for recording the appropriate output quantity during the test. The test shall be performed with both positive and negative polarities. Fifteen consecutive impulses of each polarity, corrected for atmospheric conditions, shall be applied. Outdoor type electronic current transformer passes the test if no disruptive discharge occurs in the non-self-restoring internal insulation; no flashovers occur along the non-self-restoring external insulation; no more than two flashovers for each polarity occur across the self-restoring external insulation; no other evidence of insulation failure is detected (for example, variations in the wave shape of the recorded quantities). Summary of Switching-Impulse Test: See Summary of Wet Switching Withstand Test, below. The IEC Standard Requirements 8.4 Wet test for outdoor type electronic current transformers In order to verify the performance of the external insulation, outdoor type transformers shall be subjected to a wet test. The wetting procedure shall be in accordance with IEC Primary terminals having U m < 300 kv The test shall be performed in accordance with table 3 of IEC with power-frequency voltage corrected for atmospheric conditions Primary terminals having U m?300 kv The test shall be performed with switching-impulse voltage in accordance with table 4 of IEC NxtPhase T&D Corporation Page 15
24 Summary of Wet Switching Withstand Test: Test Result: Pass CT serial #: D0XXXXR Rated Voltage: 345 kv Rated Current: 2000 A Powertech reports #: /I, Date: 05/06/03 Test date: 01/29/2003 An NXCT with a 345 kv class insulator was tested in accordance with IEC , -2, -1, IEC , and CAN3-C13-M83. The following is a summary of the tests performed. Wet switching impulse withstand tests: 950 kvrms, positive polarity, 15 full impulse waves while subjected to artificial rain. Original Wet Withstand Test Report: 2005 NxtPhase T&D Corporation Page 16
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26 The IEC Standard Requirements 8.5 RIV tests See IEC IEC , Section reads: Summary of RIV Test: Partial discharge measurement Test circuit and instrumentation The test circuit and the instrumentation used shall be in accordance with IEC 270. Some examples of test circuits are shown in figures 2 to 4. The instrument used shall measure the apparent charge q expressed in picocoulomb (pc). Its calibration shall be performed in the test circuit (see an example in figure 5). A wide-band instrument shall have a bandwidth of at least 100 khz with a upper cut-off frequency not exceeding 1,2 MHz. Narrow-band instruments shall have their resonance frequency in the range 0,15 to 2 MHz. Preferred values should be in the range from 0,5 to 2 MHz but, if feasible, the measurement should be performed at the frequency which gives the highest sensitivity. The sensitivity shall allow to detect a partial discharge level of 5 pc. NOTES 1 The noise shall be sufficiently lower than the sensitivity. Pulses that are known to be caused by external disturbances may be disregarded. 2 For the suppression of external noise, the balanced test circuit (see figure 4) is appropriate. 3 When electronic signal processing and recovery are used to reduce the background noise, this shall be demonstrated by varying its parameters so that it allows the detection of repeatedly occurring pulses. Test Result: Pass CT Serial Number: D0XXXXR Rated Voltage: 345 kv Rated Current: 2000 A Powertech Report Number: /F Date: 05/06/03 Test date: 01/30/03 An NXCT with a 345 kv class insulator was tested in accordance with IEC , -7, -2, -1, IEEE C , and CAN3-C13-M83. The following is a summary of the tests performed NxtPhase T&D Corporation Page 17
27 RIV Tests: 575 kvrms for 60 s 362 kvrms 185,000 mv 251 kvrms 37 mv 209 kvrms 13 mv Original RIV Test Report: 2005 NxtPhase T&D Corporation Page 18
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29 The IEC Standard Requirements 8.6 Transmitted overvoltage test See IEC IEC , Section 8.4 reads: 8.4 Inter-turn overvoltage test The inter-turn overvoltage test shall be performed in accordance with one of the following procedures. If not otherwise agreed, the choice of the procedure is left to the manufacturer. Procedure A: with the secondary windings open-circuited (or connected to a high impedance device which reads peak voltage), a substantially sinusoidal current at a frequency between 40 Hz and 60 Hz (in accordance with IEC 60-1) and of r.m.s. value equal to the rated primary current (or rated extended primary current (see 11.3) when applicable) shall be applied for 60 s to the primary winding. The applied current shall be limited if the test voltage of 4,5 kv peak is obtained before reaching the rated current (or extended rated current). Procedure B: with the primary winding open-circuited, the prescribed test voltage (at some suitable frequency) shall be applied for 60 s to the terminals of each secondary winding, providing that the r.m.s. value of the secondary current does not exceed the rated secondary current (or rated extended current). The value of the test frequency shall be not greater than 400 Hz. At this frequency, if the voltage value achieved at the rated secondary current (or rated extended current) is lower than 4,5 kv peak, the obtained voltage is to be regarded as the test voltage. When the frequency exceeds twice the rated frequency, the duration of the test may be reduced from 60 s as below: duration of test (in s) = twice the rated frequency x 60 test frequency with a minimum of 15 s. Summary of Transmitted Overvoltage Test: This test is not applicable to fiber optic sensors. The NXCT is not required to meet this test NxtPhase T&D Corporation Page 19
30 The IEC Standard Requirements 8.7 Low-voltage components voltage withstand test Test conditions The atmospheric conditions during the test shall be ambient air temperature: 15 C to 35 C; relative humidity: 45 % to 75 %; air p ressure: 86 kpa to 106 kpa Application of the test voltage The test voltage shall be applied to the connecting points of the electronic current transformer in a new and dry condition without self-heating. Each circuit shall be tested at the prescribed test voltage in relation to all other circuits connected together and to earth. a) For the test between a given circuit and all other circuits, all the connecting points of the single circuit shall be connected together; b) For all tests, the circuits which are to be connected to earth shall be thus connected. Unless obvious, the independent circuits are described by the manufacturer. For example, secondary converter and merging unit can be independent circuits. The test voltages shall be applied directly to the terminals. For devices with an insulating enclosure the exposed conductive parts shall be represented by a metal foil covering the whole enclosure except the terminals around which a suitable gap shall be left so as to avoid flashover to the terminals Power-frequency voltage withstand test The power-frequency voltage withstand tests shall be made by applying the voltages given in The test voltage source shall be such that, when applying half the specified value to the device under test, the voltage drop observed is less than 10 %. The source voltage shall be verified with an accuracy better than 5 %. The test voltage shall be either substantially sinusoidal with a frequency between 45 Hz and 65 Hz or d.c. The open-circuit voltage of the voltage source is initially set to not more than 50 % of the specified test voltage. It is then applied to the device under test. From this initial value the voltage shall be raised to the specified value in such a manner, that no appreciable transients occur and maintained for 1 min. It shall then be reduced smoothly to zero as rapidly as possible. Acceptance criteria: no breakdown or flashover shall occur NxtPhase T&D Corporation Page 20
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