Smart Termination TECHNICAL SPECIFICATIONS CURRENT VOLTAGE INSTRUMENTRANSFORMER
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1 Customer : REV. 0 Page 1/16 Smart Termination TECHNICAL SPECIFICATIONS CURRENT VOLTAGE INRUMENTRANSFORMER CVS G - Revision Prepared Description Checked by Rev. Date by 0 13/06/16 First issue E. Scala L. Peretto 1 27/12/2016 Drawing update, cable features added E. Scala Approved by
2 Customer : REV. 0 Page 2/16 INDEX 1. SCOPE OF THE DOCUMENT 4 2. CVS-24-G- DESCRIPTION 5 3. REFERENCE DOCUMENTS 6 4. OPERATIONAL CHARACTERIICS of CVS-24-G SERVICE CONDITIONS OF THE CVS-24-G Service conditions Ambient air temperature Service conditions for indoor CVS-24-G Earthing system Materials Safety 7 6. RATING OF THE CURRENT INRUMENT TRANSFORMER CVS-24-G Standard values of rated primary current Ipr Rated continuous thermal current Icth Short-time current ratings Standard values for symmetrical short-circuit current Rated short-time thermal current Ith Rated dynamic current Idyn Standard frequency range Rated auxiliary power supply voltage Uar Rated auxiliary power supply frequency Standard reference range of auxiliary power supply voltage Standard reference range of temperature Standard values for rated phase offset Rating for analogue voltage output Standard value of rated secondary voltage Usr Rated burden Rbr 9 7. RATING OF THE VOLTAGE INRUMENT TRANSFORMER CVS S Standard values of rated voltages Rated primary voltage Rated secondary voltage Standard values of rated voltage factor ku Earthed voltage instrument transformer Standard values of rated auxiliary power supply voltage Standard reference values of other influencing parameters Standard reference range of frequency Standard reference range of auxiliary power supply voltage Standard reference range of burden Standard reference range of temperature 9
3 Customer : REV. 0 Page 3/16 8. DESIGN FEATURES OF THE CURRENT VOLTAGE INRUMENT TRANSFORMER CVS-24-G General design features of current INRUMENT transformer Rated insulation levels for primary terminals Power-frequency withstand voltage Lightning impulse capability Partial discharges Low-voltage components voltage withstand capability General requirements for temperature rise Electromagnetic compatibility requirements Emission requirements Immunity requirements Signal-to-noise ratio Wake-up current General design features of voltage instrument transformer Rated insulation levels for primary terminals Power-frequency withstand voltage Lightning impulse capability Partial discharges Insulation requirements for low-voltage components Short-circuit withstand capability Limits of temperature rise General requirements Transmitted overvoltage requirements Electromagnetic compatibility requirements Emission requirements Immunity requirements Reliability Abnormal condition signaling CLASSIFICATION OF TES Type tests for current instrument transformer Routine tests for the current instrument transformer Type tests for the voltage instrument transformer Routine tests for the voltage instrument transformer TERMINALS MARKINGS Connector type Cable main features RECORDING MAINTENANCE REQUIREMENTS ACCURACY FOR SINGLE-PHASE CVS-24-G- MEASURING VOLTAGE INRUMENT TRANSFORMER ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE PROTECTIVE VOLTAGE INRUMENT TRANSFORMERS 14
4 Customer : REV. 0 Page 4/16 1. SCOPE OF THE DOCUMENT The scope of the present document is the definition of technical characteristics of the Low Power Current Voltage Instrument Transformer CVS-24-G-. The CVS-24-G- is for INDOOR use. In the document the term Low Power will be omitted for sake of brevity. Fig.1 Current voltage instrument transformer CVS-24-G-
5 Customer : REV. 0 Page 5/16 2. CVS-24-G- DESCRIPTION The device under specification (Fig.1) is a current voltage transformer. It has the main electrical and mechanical characteristics listed in the table below. CVS-24-G- voltage instrument transformer features Rated insulation level Rated primary voltage, Upn Maximum voltage, Um Rated voltage factor, Ku 24/50/125 kv 20/ 3 kv, 15/ 3 kv, 10/ 3 kv 24 kv 1,9 for 8h Nominal transformation ratio, Kn 10000:1 Voltage transformer 0,5 for measurement 3P for Accuracy class protection. The maximum deviation with respect to the prototype is 0.1% for ratio error and 0,1 for phase error. CVS-24-G- current instrument transformer features Rated primary current, Ipr Rated primary time constant for transient performance, τpr Rated short time withstand thermal current, Ith Rated Dynamic current, Idyn Nominal transformation ratio, Kra 300 A 40 ms 16 ka / 3s 31,5 ka 1000 A / 31 mv Current transformer Accuracy class (Ratio error, Phase displacement, Deviation respect to the prototype accuracy) In compliance with the table 7.2 of the technical specification DJ5400 CVS-24-G- other features Nominal frequency Hz
6 Customer : REV. 0 Page 6/16 Weight 1,5 kg Applicable Standards IEC ; REFERENCE DOCUMENTS The following reference documents were taken into consideration for the definition of CVS-24-G operational characteristics: 1. IEC (1999) "Instrument transformers Part 7: voltage transformers"; 2. IEC (2002) "Instrument transformers Part 7: current transformers"; 3. IEC (2010) High voltage test techniques Part 1: General definitions and test requirements ; 4. IEC (1986) Guide for the selection of insulator in respect of polluted conditions 5. IEC (1996) Insulation co ordination Part 2: Application guide 6. IEC Instrument transformers Part 6: Requirements for protective current transformers for transient performance 7. IEC , Instrument transformers Part 1: Current transformers 8. ENEL Spec. DJ5400 rev 0 (2013) Smart Termination 4. OPERATIONAL CHARACTERIICS of CVS-24-G- According to [1] and [2], the operational characteristics may be collected into six main sessions: - Service conditions; - Ratings, - Design features; - Test performed; - Markings; - Accuracy for single-phase CVS- 24-G- measuring current voltage instrument transformer;
7 Customer : REV. 0 Page 7/16 - Additional requirements for single-phase CVS-24-G- protective current voltage transformer. 5. SERVICE CONDITIONS OF THE CVS-24-G- According to [1, 2 and 3] CVS-24-G- is suitable for both measuring and protection purposes. 5.1 Service conditions 5.1.1Ambient Air Temperature The Supplier declares that the combined sensor operates in the standard range of ambient air temperature [-5; +40] C Service conditions for indoor CVS-24-G- CVS-24-G- is in compliance with the requirements of [1, and 2, 4.2.4] regarding the service conditions for indoor use: Table 5.1 Solar radiation Humidity and water vapour Negligible 1) the average value of the relative humidity, measured during a period of 24 h does not exceed 95 %; 2) the average value of the relative humidity for a period of one month does not exceed 90 %; 3) the average value of the water vapour pressure for a period of 24 h does not exceed 2,2 kpa; 4) the average value of the water vapour pressure for a period of one month does not exceed 1,8 kpa. 5.2 Earthing system [1, 4.3 and 2, 4.3]
8 Customer : REV. 0 Page 8/16 The CVS-24-G- is an earthed current voltage transformer. The output voltage of CVS is representative of the phase to ground primary voltage. 5.3 Material The CVS-24-G- is mounted on the Cooper plug-in termination DTS636. The material is EPDM rubber. The plug-in termination is already certified as per CENELEC HD 629. Metallic lug can be either crimping or mechanical one upon customer specifications. 5.4 Safety The CVS-24-G- has an intrinsically safe failure mode. In case of failure, avoids explosive shattering of the housing. The Supplier is able to provide sufficient service experience evidence to support a particular design is not associated with brittle fracture problems. 6. RATING OF THE CURRENT INRUMENT TRANSFORMER CVS-24-G- 6.1 Standard value for rated primary current Ipr [2, 5.1.1] The CVS-24-G- operates with standard value of rated primary current equal to 300 A. 6.2 Rated continuous thermal current Icth [2, 5.1.3] The rated continuous thermal current is 360 A (1,2 300). 6.3 Short-time current ratings [2, 5.1.4] Standard values for symmetrical short-circuit current Rated short-time thermal current Ith. The standard r.m.s. value is 16 ka and is in compliance with [7] Rated dynamic current Idyn. The value of rated dynamic current is 31,5 ka. 6.4 Standard frequency range [2, 5.1.5]
9 Customer : REV. 0 Page 9/16 The accuracy class of the CVS-24-G- is assured for frequencies ranging from 99 % to 101 % of the rated frequency for measurements purposes and from 96 % to 102 % for protection purposes in accordance with [1]. 6.5 Rated auxiliary power supply voltage Uar [2, 5.1.7] The combined sensor CVS-24-G- does not need auxiliary power supply. 6.6 Rated auxiliary power supply frequency [2, 5.1.8] The combined sensor CVS-24-G- does not need auxiliary power supply. 6.7 Standard reference range of auxiliary power supply voltage [2, 5.1.9] N.A. 6.8 Standard reference range of temperature [2, ] The device withstands the thermal effects caused by the following conditions: maximum specified ambient air temperature (+ 40 C); rated frequency (50/60 Hz); - rated continuous thermal current (360 A) 6.9 Standard values for rated phase offset [2, 5.2] The standards value for rated phase offset is 90 degrees Rating for analogue voltage output [2, 5.4] The Standard values for rated secondary voltage, Usr, is 9,3 mv. The minimum value for rated burden is 10 kω -2%. 7. RATING OF THE VOLTAGE INRUMENT TRANSFORMER CVS-24-G-
10 Customer : REV. 0 Page 10/ Standard values of rated voltages [1, 5.1] 7.1.1Rated primary voltage The CVS-24-G- can operate with rated primary voltage values equal to 20/ 3 kv, 15/ 3 kv or 10/ 3 kv Rated secondary voltage The CVS-24-G- output voltage is up to 2/ 3 V, 1.5/ 3 V or 1/ 3 V in accordance with Standard values of rated voltage factor ku [1, 5.3] Earthed current voltage transformers The voltage Factor of the CVS-24-G- is 1, Standard values of rated auxiliary power supply voltage [1, 5.4] The combined sensor CVS-24-G- does not need auxiliary power supply. 7.4 Standard reference values of other influencing parameters [1, 5.5] Standard reference range of frequency The accuracy class of the CVS-24-G- is assured for frequencies ranging from 99 % to 101 % of the rated frequency for measurements purposes and from 96 % to 102 % for protection purposes Standard reference range of auxiliary power supply voltage NA Standard reference range of burden The minimum value for rated burden is 1 MΩ -2% Standard reference range of temperature Unless otherwise specified, the standard reference range of temperature is from -5 to + 40 C. 8. DESIGN FEATURES OF THE CURRENT VOLTAGE INRUMENT TRANSFORMER CVS-24-G- 8.1 General design features of current Instrument transformer [2, 6.1] 8.1.1Rated insulation levels for primary terminals The rated insulation level of the primary voltage of CVS-24-G- is 24/50/125 kv.
11 Customer : REV. 0 Page 11/ Power-frequency withstand voltage Power-frequency withstand voltage is 50 kv Lightning impulse capability The lighting impulse capability is 125 kv Partial discharges The CVS-24-G- features partial discharge levels below 10 pc at 20 kv Low-voltage components voltage withstand capability [2, ] NA General requirements for temperature rise [2, 6.1.2] The current transformer is designed and constructed to withstand, without exceeding the specified limit for temperature rise and without damage, the thermal effects caused by the following conditions: maximum specified ambient temperature; rated frequency; rated continuous thermal current; 1,2 times the rated primary voltage [1,2 20/ 3 = 13,9 kv]; secondary burden which causes the maximum internal power dissipation of the secondary converter (10 KΩ -2%) Electromagnetic compatibility requirements [2, 6.1.5] The CVS-24-G- is in compliance with all the requirements concerning the immunity and emissions. In particular the following tests have been carried out and passed Emission requirements NA Immunity requirements - Harmonic and interharmonic disturbance - Slow voltage variation - Voltage dips and short interruptions - Surge immunity - Electrical fast transient / burst - Oscillatory wave immunity - Electrostatic discharge - Power frequency magnetic field immunity - Pulse magnetic field immunity - Damped oscillatory magnetic field immunity - Radiated radio-frequency electromagnetic field immunity.
12 Customer : REV. 0 Page 12/ Signal-to-noise ratio [2, 6.1.6] The minimum signal-to-noise ratio of the ECT output is 40 db (relative to rated secondary output). 8.2 General design features of voltage instrument transformer [1, 6.1] 8.2.1Rated insulation levels for primary terminals The rated insulation level of the primary voltage of CVS-24-G- is 24/50/125 kv Power-frequency withstand voltage Power-frequency withstand voltage is 50 kv Lightning impulse capability The lighting impulse capability is 125 kv Partial discharges The CVS-24-G- features partial discharge levels below 10 pc at 20 kv. NA 8.2.5Insulation requirements for low-voltage components [1, 6.2] 8.2.6Short-circuit withstand capability for low-voltage components [1, 6.3] NA Limits of temperature rise [1, 6.4] General requirements The CVS-24-G- withstands the thermal effects caused by the following conditions: maximum specified ambient temperature (+ 40 C); rated frequency (50/60 Hz); rated continuous thermal current (360 A); 1,2 times the rated primary voltage [1,2 20/ 3 = 13,85 kv]; secondary burden which causes the maximum internal power dissipation of the secondary converter (1 MΩ -2%) 8.2.8Transmitted overvoltage requirements [1, 6.6] The CVS-24-G- is protected against the emissions of overvoltages transmitted from the primary to the secondary output or to the power supply.
13 Customer : REV. 0 Page 13/ Electromagnetic compatibility requirements [1, 6.7] The CVS-24-G- is in compliance with all the requirements reported in [1], both concerning the immunity and emissions. In particular the following tests have been carried out and passed Emission requirements NA Immunity requirements - Harmonic and interharmonic disturbance - Slow voltage variation - Voltage dips and short interruptions - Surge immunity - Electrical fast transient / burst - Oscillatory wave immunity - Electrostatic discharge - Power frequency magnetic field immunity - Pulse magnetic field immunity - Damped oscillatory magnetic field immunity - Radiated radio-frequency electromagnetic field immunity. 8.3 Reliability [1, 6.8 2, 6.1.9] The estimated MTTF of the CVS-24-G- is > h. 8.4 Abnormal condition signalling [1, 6.10] The CVS-24-G- is designed in order to avoid spurious tripping of protective relays in presence of impulse voltages. 9. CLASSIFICATION OF TES In the following the Type tests and Routine tests performed for the CVS-24-G- are listed.
14 Customer : REV. 0 Page 14/ Type tests for the current instrument transformer [2, 7.2] a) short-time current tests [2, 8.1]; b) temperature-rise test [2, 8.2]; c) lightning-impulse test [2, 8.3.2]; d) EMC tests: immunity [2, 8.8.4]; e) accuracy test [2, 8.9]; 9.2 Routine tests for the current instrument transformer [2, 7.3] a) accuracy tests [2, 9.4]; 9.3 Type tests for the voltage instrument transformer [1, 7.1] a) lightning impulse test [1, 8.1.2]; b) tests for accuracy [1, 8.3]; 9.4 Routine tests for the voltage instrument transformer [1, 7.2] a) verification of terminal markings [1, 9.1] b) partial discharge measurement [1, 9.2.4]; c) tests for accuracy [1, 9.4] 10 TERMINAL MARKINGS 10.1 Connector type PI N 1 1 GND 2 GND 3 V out - (CS) 4 V out + (CS) 5 V out - (VS) 6 V out + (VS) 7 NC 8 NC The connector is RJ45 type. Refer to the Figure for connections pin-out.
15 Customer : REV. 0 Page 15/ Cable main features Output signal cable Temperature range Cable length Signal cable termination S/UTP patch cable - Cat. 5E [-40; +105] C; industrial use 4,00 m (-0,00; +0,20) m 8 pins RJ45 plug 11 RECORDING Records of all produced CVS-24-G- in accordance with this standard are recorded for a minimum of 10 years. The records include the following information: type reference number; year of manufacture; type tests, date and results; sample tests, date and results; routine tests, date and results. 12 MAINTENANCE REQUIREMENT Current Voltage Instrument Transformer CVS-24-G- is a disposable device. No sub-parts can be replaced. 13 ACCURACY FOR SINGLE-PHASE CVS-24-G- MEASURING CURRENT VOLTAGE INRUMENT TRANSFORMER [1, 12 2, 12] The current voltage instrument transformer CVS-24-G- is in the accuracy class reported in the Table 13.1 both for current and voltage measurements. Table 13.1 Accuracy class Special quality metering Percentage current (ratio) error (±) at the harmonics shown below Phase displacement (±) at harmonics shown below (degree) 1 st to 2 nd harmonic 3 rd to 50 th harmonic 1 st to 2 nd harmonic 3 rd to 50 th harmonic 1% 5 % 1 5 See Appendix D of [2].
16 Customer : REV. 0 Page 16/16 14 ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE ALTEA CVS-24-G- PROTECTIVE CURRENT VOLTAGE INRUMENT TRANSFORMERS [1, 13 2, 13] The current voltage instrument transformer CVS-24-G- is in the accuracy class 3P for the voltage and 5P20 for the current. END OF DOCUMENT
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