/9 TECHNICAL SPECIFICATIONS VOLTAGE LOW-POWER TRANSFORMER VS- Rev. Date Revision Description Prepared by Checked by Approved by 0 24/09/2 First issue A. Peretto L. Peretto 24/06/6 All text review E. Scala L. Peretto J. L. Kennedy
2/9 INDEX. SCOPE OF THE DOCUMENT 4 2. VS- DESCRIPTION 4 3. REFERENCE DOCUMENTS 6 4. OPERATIONAL CHARACTERISTICS of ALTEA VS- 6 5. SERVICE CONDITIONS OF THE ALTEA VS- 6 5. Service conditions 6 5.. Ambient air temperature 6 5..2 Altitude 6 5..3 Vibration and earth tremors 7 5..4 Service conditions for the ALTEA VS- 7 5.2 Earthing system 7 5.3 Materials 7 5.4 Safety 0 6. RATING OF THE LOW-POWER VOLTAGE TRANSFORMER VS- 0 6. Standard values of rated voltages 0 6.. Rated primary voltage 0 6..2 Rated secondary voltage 0 6.2 Standard values of rated voltage factor ku 0 6.2. Earthed low-power voltage transformer 0 6.2.2 Unearthed low-power voltage transformer 0 6.3 Standard values of rated auxiliary power supply voltage 0 6.4 Standard reference values of other influencing parameters 0 6.4. Standard reference range of frequency 0 6.4.2 Standard reference range of auxiliary power supply voltage 0 6.4.3 Standard reference range of burden 0 6.4.4 Standard reference range of temperature 0 7. DESIGN FEATURES OF THE LOW-POWER VOLTAGE TRANSFORMER VS- 7. Insulation requirements for primary voltage 7.. Rated insulation levels for primary terminals 7..2 Power-frequency withstand voltage 7..3 Lightning impulse capability 7..4 Power-frequency withstand voltage for earthed terminal 7..5 Partial discharges 7..6 Chopped lightning impulse 7..7 Capacitance and dielectric dissipation factor
3/9 7.2 Insulation requirements for low-voltage components 7.2. Power-frequency voltage withstand capability 7.2.2 Impulse voltage withstand capability 7.3 Short-circuit withstand capability 2 7.4 Limits of temperature rise 2 7.4. General requirements 2 7.5 Radio interference voltage requirements 2 7.6 Transmitted overvoltage requirements 2 7.7 Electromagnetic compatibility requirements 2 7.7. Emission requirements 2 7.7.2 Immunity requirements 3 7.8 Reliability 3 7.9 Abnormal conditions withstand capability 3 7.0 Abnormal condition signalling 3 7. Mechanical requirements 3 7.2 Earthing terminals 3 7.2. Earthing of the primary voltage and primary converter 4 7.2.2 Earthing of the secondary converter 4 8. CLASSIFICATION OF TESTS 4 8. Type tests 4 8.2 Routine tests 4 8.3 Special tests 4 8.4 Type tests for indoor post insulator installation 5 8.5 Sample tests for indoor post insulator installation 5 8.6 Routine test indoor installation 5 9. MARKINGS 6 9. Rating plate markings 6 9.2 Terminals markings 6 9.2. Connector type RJ45 6 9.3 Record of Insulator 6 9.4 Maintenance requirement 7 0. ACCURACY FOR SINGLE-PHASE ALTEA VS- ELECTRONIC MEASURING VOLTAGE TRANSFORMER 7. ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE ELECTRONIC PROTECTIVE VOLTAGE TRANSFORMERS 8. Standard accuracy classes for electronic protective voltage transformers 8.2 Transient performance requirements 8.2. Primary short circuit 8.3 Opening on a line 8.4 Reclosing on a line with trapped charges 8
4/9 SCOPE OF THE DOCUMENT The scope of the present document is the definition of technical characteristics of the Low-Power Voltage Transformer for indoor use Altea VS- in accordance with reference documents listed in Chapter 3.. VS- DESCRIPTION The device under specification (Fig.) is a MV low-power voltage transformer. It has the main electrical and mechanical characteristics listed in the table below. * marks the characteristics that can be set to different values upon request. Rated insulation level 24/50/25 kv Rated primary voltage, Upn * 20/ 3 kv Maximum voltage, Um 24 kv Rated secondary voltage, Usn * V Rated voltage factor, Ku,9 for 8h Nominal frequency 50 / 60 Hz Nominal transformation ratio, Kn * 20/ 3 kv / V Accuracy class * 3P for protection 0.5 for measurements Accuracy on Harmonics Special Quality metering Auxiliary Supply voltage ±2 Vdc Max. Auxiliary Supply current 5 ma Bandwidth (-3 db) 00 khz Creepage 375 mm Primary terminal capacity pf Weight,6 kg Applicable Standards IEC 60044-7, IEC 60660
5/9 Fig. Low-power voltage transformer VS-
6/9 3. REFERENCE DOCUMENTS The following reference documents were considered for the definition of Altea VS- operational characteristics:. IEC 60044-7 (999-2) "Instrument transformers - Part 7: Electronic voltage transformers"; 2. IEC 60660: Insulators - Tests on Indoor Post Insulators of Organic Material for Systems with Nominal Voltages Greater Than 000 V up to but Not Including 300 kv; 3. IEC 60044-8 (2002) "Instrument transformers - Part 8: Electronic current transformers"; 4. IEC 60060- (200) High voltage test techniques Part : General definitions and test requirements ; 5. IEC 6085 (986) Guide for the selection of insulator in respect of polluted conditions 6. IEC 6007-2 (996) Insulation co-ordination - Part 2: Application guide 4. OPERATIONAL CHARACTERISTICS of ALTEA VS- According to [], the operational characteristics are collected into six main sessions: 5. Service conditions; 6. Rating, 7. Design features; 8. Test performed; 9. Markings; 0. Accuracy for single-phase Altea VS- electronic measuring voltage transformer;. Additional requirements for single-phase Altea VS- electronic protective voltage transformer. 5. SERVICE CONDITIONS OF THE ALTEA VS- According to [ and 2] the low-power voltage transformer Altea VS- is suitable for both measuring and protection purposes. 5. Service conditions 5.. Ambient Air Temperature The ambient air temperature range is the standard one for indoor applications: [-5; + 40] C.
7/9 5..2 Altitude For installations at an altitude higher than 000 m, the arcing distance under the standardized reference atmospheric conditions is determined by multiplying the withstand voltages required at the service location by a factor k in accordance with Figure 3 of []. 5..3 Vibrations on earth tremors Typical vibrations to the low-power voltage transformer due to external causes or earth tremors do not affect the operation of VS-. 5..4 Service conditions for indoor ALTEA VS- Altea VS- is compliant with the requirements of [, 4..4] regarding the service conditions for indoor use: Table 5. Solar radiation Humidity and water vapour Negligible ) 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,8 kpa. 5.2 Earthing system [, 4.3] The Altea VS- is an earthed low-power voltage transformer. The output voltage of the Altea VS- is representative of the phase to ground primary voltage. 5.3 Material The Altea VS- is epoxy resin material named EA-2470/NA whose features are reported in Table 5.2.
8/9 Table 5.2
9/9 VALUE TEST SPECIFICATION UNIT indicative nominal ** Tollerance Note Specific heat Thermal conductivity Coefficient of linear thermal expansion Index of temperature ( 50% flexural resistance 20000 h) ASTM D-2303 DIN 5362 UNI 4289 j kg * C W 0,6 0,9 m * C ASTM D-696 UNI 606 C- 4 * 0-5 IEC 6026 DIN 53446 30-6 Glass transition temperature Heat deformation resistance according to Martens IEC 6006 0 C DIN 53458 UNI 428 Flammability temperature DIN 5584 > 250 Glow resistance of sample finished piece ASTM igniz. D-229 Met. II spegn. IEC 60695 Optical density max ASTM E 662 s 00 positive result +0-5 +5-0 Acid alogenidric gaseous CEI 20-37 Parte I mg/g absent index of tosicity CEI 20-37 Parte II Action resistance of micro-organisms ASTM G2-G22 good Resistance of oils, solvents, detergents, hot and cold water good
0/9 5.4 Safety The Low-power voltage transformer Altea VS- 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 LOW-POWER VOLTAGE TRANSFORMER VS- 6. Standard values of rated voltages [, 5.] 6.. Rated primary voltage The Altea-VS- operates with rated primary voltage values from 6 to 20/ 3 kv. 6..2 Rated secondary voltage The Altea-VS- rated output voltage is V. 6.2 Standard values of rated voltage factor ku [, 5.3] 6.2. Earthed low-power voltage transformers The voltage factor of the Altea VS- is,9. 6.2.2 Unearthed low-power voltage transformers for Altea VS-. 6.3 Standard values of rated auxiliary power supply voltage [, 5.4] Power supply voltage for the Altea VS- is 2 Vdc. 6.4 Standard reference values of other influencing parameters [, 5.5] 6.4. Standard reference range of frequency The accuracy class of the Altea VS- is assured for frequencies ranging from 99 % to 0 % of the rated frequency for measurements purposes and from 96 % to 02 % for protection purposes. 6.4.2 Standard reference range of auxiliary power supply voltage The accuracy class of the Altea VS- is assured for auxiliary power supply ranging from 90 % to 0 % of the rated auxiliary power supply voltage.
/9 6.4.3 Standard reference range of burden The accuracy class of the Altea VS- is assured for load impedances above 00 k. 6.4.4 Standard reference range of temperature The standard reference range of ambient air temperature is from -5 to +40 C. 7. DESIGN FEATURES OF THE LOW-POWER VOLTAGE TRANSFORMER VS- 7. Insulation requirements for primary voltage [, 6] 7.. Rated insulation levels for primary terminals The rated insulation level of the primary voltage of VS- is 24 kv. 7..2 Power-frequency withstand voltage Power-frequency withstand voltage is 50 kv. 7..3 Lightning impulse capability The lighting impulse capability is 25 kv. 7..4 Power-frequency withstand voltage for earthed terminal The terminal of the primary voltage sensor intended to be earthed must, when insulated from the case or frame, be capable of withstanding a rated power-frequency short-duration withstand voltage of 3 kv (r.m.s.) for min. for Altea VS- since one of the input terminals is connected to ground and to the case. 7..5 Partial discharges The Altea VS- features partial discharge levels are below 50 pc at 28,8 kv (equal to,2 24) and below 20 pc at 6,6 kv (equal to,2 24/ 3). Partial Discharge extinction level is 5,2 kv (equal to, 24/ 3). 7..6 Chopped lightning impulse If additionally specified, the primary voltage terminals shall also be capable of withstanding a chopped lightning-impulse voltage which has a peak value of 5 % of the full lightning-impulse voltage. for Altea VS-.
2/9 7..7 Capacitance and dielectric dissipation factor These requirements apply only to low-power voltage transformers with liquid-immersed primary voltage sensor insulation having Um 72,5 kv. for Altea VS-. 7.2 Insulation requirements for low-voltage components [, 6.2] Available upon special customer request. This insulation shall meet the following requirements: 7.2. Power-frequency voltage withstand capability Withstand voltage level: 2,8 kv r.m.s. 7.2.2 Impulse voltage withstand capability Withstand voltage level: 5 kv. 7.3 Short-circuit withstand capability [, 6.3] Altea VS- is capable of withstanding short circuit between secondary voltage terminals for the duration of 60 s, when energized at rated voltage. 7.4 Limits of temperature rise [, 6.4] 7.4. General requirements Altea VS- withstands the thermal effects caused by the following conditions: maximum specified ambient temperature (+ 40 C); rated frequency (50/60 Hz);,2 times the rated primary voltage [,2 20/ 3 = 3,85 kv]; the combination of auxiliary power supply voltage and secondary burden which causes the maximum internal power dissipation of the secondary converter (±2 V power supply and 5 k minimum load impedance value). 7.5 Radio interference voltage requirements [6.5] The purpose of the radio interference voltage test is to verify the emission of corona discharges created by the low-power voltage transformer. The main cause of corona discharges are high-voltage parts and partial discharges at the surface of the insulator housing. This test is relevant for low-power voltage transformers having Um 23 kv. for Altea VS-.
3/9 7.6 Transmitted overvoltage requirements [, 6.6] Alta VS- is protected against the emissions of overvoltages transmitted from the primary to the secondary output or to the power supply. 7.7 Electromagnetic compatibility requirements [, 6.7] Altea VS- is in compliance with all the requirements reported in [], both concerning the immunity and emissions. In particular the following tests have been carried out and passed. 7.7. Emission requirements 7.7.2 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. 7.8 Reliability [, 6.8] The estimated MTTF of the Altea VS- is 250.000 h. 7.9 Abnormal conditions withstand capability [, 6.9] Depending on the technology used, the short-circuit withstand capability and overheating withstand capability only apply to the secondary converter. for Altea VS-.
4/9 7.0 Abnormal condition signalling [, 6.0] Altea VS- is designed in order to avoid spurious tripping of protective relays in presence of impulse voltages. 7. Mechanical requirements [, 6.] These requirements apply only to low-power voltage transformers which have a highest voltage for equipment of 72,5 kv and above. for Altea VS-. 7.2 Earthing terminals [, 6.2] 7.2. Earthing of the primary voltage and primary converter Altea VS- is earthed thought the two clamping screws with diameter of 0 mm (see Fig. ). 7.2.2 Earthing of the secondary converter for Altea VS-. 8. CLASSIFICATION OF TESTS In the following the Type tests and Routine tests performed for Altea VS- are listed. 8. Type tests [, 7.] a) lightning impulse test [, 8..2]; b) switching impulse test [, 8..3]; c) wet test for outdoor type low-power voltage transformers [, 8.2]; for Altea VS-24-S. d) tests for accuracy [, 8.3]; e) abnormal conditions withstand capability test [, 8.4]; for Altea VS-24-S. f) radio interference voltage test [, 8.5]; for Altea VS-24-S. g) transmitted overvoltage test [, 8.6]; for Altea VS-24-S. h) electromagnetic compatibility tests: emission [, 8.7.] i) electromagnetic compatibility tests: immunity [, 8.7.2] j) impulse voltage withstand test for low-voltage components [, 8.8] k) transient performance test [, 8.9]: - primary short-circuit [, 8.9.];
5/9 - reclosing on a line with trapped charges [, 8.9.2]; for Altea VS-. 8.2 Routine tests [, 7.2] a) verification of terminal markings [, 9.] b) power-frequency withstand tests on primary voltage terminals [, 9.2] c) partial discharge measurement [, 9.2.4]; d) power-frequency voltage withstand test for low-voltage components [, 9.3] Only on insulators with sensor equipped with galvanic insulation. e) tests for accuracy [, 9.4] 8.3 Special tests [, 7.3] * a) chopped lightning-impulse test on primary voltage terminals [, 0.]; b) measurement of capacitance and dielectric dissipation factor [, 0.2]; c) mechanical strength tests [, 0.3]; * To be performed on client request. In addition, for post insulators of organic material for indoor service in electrical installations or equipment operating in air at atmospheric pressure on alternating current with a nominal voltage greater than 000 V up to, but lower than 300 kv, test foreseen by the standard [2] are applied. 8.4 Type tests for indoor post insulator installation [2, 3] a) water absorption test [2, 3.0]; b) flammability test [2, 3.2]; c) ageing and humidity test [2, 3.]. d) test for mechanical bending strength as a function of temperature [2, 3.9]; e) dry lightning impulse withstand voltage test [2, 3.3]; (covered by test a) of Type tests) f) dry power-frequency withstand voltage test [2, 3.4]; g) lightning impulse puncture test [2, 3.6]; h) temperature cycle test [2, 3.3]; i) partial discharge extinction voltage test [2, 3.5]; j) test for deflection under load at normal ambient temperature conditions [2, 3.8]; k) mechanical failing load test (bending test, tensile test, torsion test, compres. test) [2, 3.7].
6/9 8.5 Sample tests for indoor post insulator installation [2, 4] The samples shall then be subjected to the following tests in the order given: a) verification of dimensions [2, see 4.2]; b) water absorption test for materials other than cast epoxy resin or PUR resin only [2, 3.0]; c) partial discharge extinction voltage test [2, 3.5]; (covered by test c) of Routine tests) d) test for deflection under load at normal ambient temperature conditions [2, 3.8] *; e) test for mechanical strength at normal ambient temperature conditions [2, 3.7] *. * To be performed on client request. 8.6 Routine tests for indoor installation [2, 5] a) visual examination [2, 5.2]; b) mechanical routine test for insulators of design category A; for insulators intended to be used at rated voltage 72,5 kv and above only [2, 5.3]; for Altea VS-. c) electrical routine test and partial discharge measurement for post insulators of design category B [2, 5.4]; (covered by test c) of Routine tests) 9. MARKINGS [, 2,.5] 9. Rating plate markings The rating plate of the electronic device is reported in the below figure. Designation: Electronic Voltage Transformer (EVT) Type: Weight: Serial/year: Ref. Std.: VS-.6 kg 60044-7 Electrical Characteristics Auxiliary Power Supply Rated Insulation Level = 24/50/25 kv Uar = ±2 V DC
7/9 fr = 50/60 Hz Iar = 0 ma Ia max = 5 ma EVT Characteristics Upr/Usr = 20/ 3kV / V φor = 0 º Rbr = 00 kω ku =,9 / 8h Class 0.5 9.2 Terminal markings 9.2. Connector type RJ45 GND 2 GND 3 GND 4 GND 5 V out 6 V out + 7 + V cc 8 - V SS 9.3 Record of Insul ator Altea BV maintains records of all produced insulators in accordance with this standard for a minimum of 0 years. These records contains the following information: type reference number; year of manufacture; type tests, date and results; sample tests, date and results; routine tests, date and results. 9.4 Maintenance requirement Altea Low-power voltage transformer Altea VS-I is a disposable device. No sub-parts can be replaced. 0. ACCURACY FOR SINGLE-PHASE ALTEA VS- ELECTRONIC MEASURING VOLTAGE TRANSFORMER [, 2]
8/9 The low-power voltage transformer Altea VS- is in the Accuracy class 3P for protection and 0,5 for measurement, in the range of temperature ranging from - 25 to + 65 C.. ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE ELECTRONIC PROTECTIVE VOLTAGE TRANSFORMERS [, 3]. Standard accuracy classes for electronic protective voltage transformers Standard accuracy class for Altea VS- is 3P..2 Transient performance requirements.3. Primary short circuit Following a short circuit of the supply between the high-voltage terminal and the low-voltage terminal connected to earth, the secondary output voltage of Altea VS- will decay, within one cycle of rated frequency, to a value of less than 0 % of the peak value before short circuit..3 Opening on a line When opening a line results in a trapped charge, the secondary voltage component Us dc(t) shall decay to zero in order to prevent saturation of input transformers of the connected equipments. This time constant must be declared by the manufacturer. for Altea VS-..4 Reclosing on a line with trapped charges for Altea VS-. END OF DOCUMENT
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