TECHNICAL SPECIFICATIONS VOLTAGE LOW-POWER … Specifications VS-24-I Altea.pdf · IEC 60815 (1986) uide for the selection of insulator in respect of polluted conditions 6. IEC 60071-2

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF ALTEA B.V. NOT DISCLOSABLE, NOT REPRODUCIBLE. ALL RIGHTS RESERVED Altea B.V. – Hoogoorddreef 15, 1101 BA Amsterdam, The Netherlands

Date: 12/03/2017

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TECHNICAL SPECIFICATIONS

VOLTAGE LOW-POWER TRANSFORMER

VS-24-I

Rev. Date Revision

Description Prepared by Checked by Approved by

0 24/09/12 First issue A. Peretto L. Peretto 1 24/06/16 All text review E. Scala L. Peretto J. L. Kennedy


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INDEX

1. SCOPE OF THE DOCUMENT 4

2. VS-24-I DESCRIPTION 4

3. REFERENCE DOCUMENTS 6

4. OPERATIONAL CHARACTERISTICS of ALTEA VS-24-I 6

5. SERVICE CONDITIONS OF THE ALTEA VS-24-I 6

5.1 Service conditions 6

5.1.1 Ambient air temperature 6

5.1.2 Altitude 6

5.1.3 Vibration and earth tremors 7

5.1.4 Service conditions for the ALTEA VS-24-I 7

5.2 Earthing system 7

5.3 Materials 7

5.4 Safety 10

6. RATING OF THE LOW-POWER VOLTAGE TRANSFORMER VS-24-I 10

6.1 Standard values of rated voltages 10

6.1.1 Rated primary voltage 10

6.1.2 Rated secondary voltage 10

6.2 Standard values of rated voltage factor ku 10

6.2.1 Earthed low-power voltage transformer 10

6.2.2 Unearthed low-power voltage transformer 10

6.3 Standard values of rated auxiliary power supply voltage 10

6.4 Standard reference values of other influencing parameters 10

6.4.1 Standard reference range of frequency 10

6.4.2 Standard reference range of auxiliary power supply voltage 10

6.4.3 Standard reference range of burden 10

6.4.4 Standard reference range of temperature 10

7. DESIGN FEATURES OF THE LOW-POWER VOLTAGE TRANSFORMER

VS-24-I 11

7.1 Insulation requirements for primary voltage 11

7.1.1 Rated insulation levels for primary terminals 11

7.1.2 Power-frequency withstand voltage 11

7.1.3 Lightning impulse capability 11

7.1.4 Power-frequency withstand voltage for earthed terminal 11

7.1.5 Partial discharges 11

7.1.6 Chopped lightning impulse 11

7.1.7 Capacitance and dielectric dissipation factor 11


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7.2 Insulation requirements for low-voltage components 11

7.2.1 Power-frequency voltage withstand capability 11

7.2.2 Impulse voltage withstand capability 11

7.3 Short-circuit withstand capability 12

7.4 Limits of temperature rise 12

7.4.1 General requirements 12

7.5 Radio interference voltage requirements 12

7.6 Transmitted overvoltage requirements 12

7.7 Electromagnetic compatibility requirements 12

7.7.1 Emission requirements 12

7.7.2 Immunity requirements 13

7.8 Reliability 13

7.9 Abnormal conditions withstand capability 13

7.10 Abnormal condition signalling 13

7.11 Mechanical requirements 13

7.12 Earthing terminals 13

7.12.1 Earthing of the primary voltage and primary converter 14

7.12.2 Earthing of the secondary converter 14

8. CLASSIFICATION OF TESTS 14

8.1 Type tests 14

8.2 Routine tests 14

8.3 Special tests 14

8.4 Type tests for indoor post insulator installation 15

8.5 Sample tests for indoor post insulator installation 15

8.6 Routine test indoor installation 15

9. MARKINGS 16

9.1 Rating plate markings 16

9.2 Terminals markings 16

9.2.1 Connector type RJ45 16

9.3 Record of Insulator 16

9.4 Maintenance requirement 17

10. ACCURACY FOR SINGLE-PHASE ALTEA VS-24-I ELECTRONIC

MEASURING VOLTAGE TRANSFORMER 17

11. ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE ELECTRONIC

PROTECTIVE VOLTAGE TRANSFORMERS 18

11.1 Standard accuracy classes for electronic protective voltage transformers 18

11.2 Transient performance requirements 18

11.2.1 Primary short circuit 18

11.3 Opening on a line 18

11.4 Reclosing on a line with trapped charges 18


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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-24-I in accordance with reference documents listed in Chapter

3.

1. VS-24-I DESCRIPTION

The device under specification (Fig.1) 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 24/50/125 kV

Rated primary voltage, Upn * 20/√3 kV

Maximum voltage, Um 24 kV

Rated secondary voltage, Usn * 1 V

Rated voltage factor, Ku 1,9 for 8h

Nominal frequency 50 / 60 Hz

Nominal transformation ratio, Kn * 20/√3 kV / 1 V

Accuracy class * 3P for protection

0.5 for measurements

Accuracy on Harmonics Special Quality metering

Auxiliary Supply voltage ±12 Vdc

Max. Auxiliary Supply current 15 mA

Bandwidth (-3 dB) 100 kHz

Creepage 375 mm

Primary terminal capacity 1 pF

Weight 1,6 kg

Applicable Standards IEC 60044-7, IEC 60660


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Fig.1 – Low-power voltage transformer VS-24-I


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3. REFERENCE DOCUMENTS

The following reference documents were considered for the definition of Altea VS-24-I operational

characteristics:

1. IEC 60044-7 (1999-12) "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 1 000 V up to but Not Including 300 kV;

3. IEC 60044-8 (2002) "Instrument transformers - Part 8: Electronic current transformers";

4. IEC 60060-1 (2010) “High voltage test techniques – Part 1: General definitions and test requirements”;

5. IEC 60815 (1986) “Guide for the selection of insulator in respect of polluted conditions”

6. IEC 60071-2 (1996) “Insulation co-ordination - Part 2: Application guide”

4. OPERATIONAL CHARACTERISTICS of ALTEA VS-24-I

According to [1], the operational characteristics are collected into six main sessions:

5. Service conditions;

6. Rating,

7. Design features;

8. Test performed;

9. Markings;

10. Accuracy for single-phase Altea VS-24-I electronic measuring voltage transformer;

11. Additional requirements for single-phase Altea VS-24-I electronic protective

voltage transformer.

5. SERVICE CONDITIONS OF THE ALTEA VS-24-I

According to [1 and 2] the low-power voltage transformer Altea VS-24-I is suitable for both

measuring and protection purposes.

5.1 Service conditions

5.1.1 Ambient Air Temperature

The ambient air temperature range is the standard one for indoor applications: [-5; + 40] °C.


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5.1.2 Altitude

For installations at an altitude higher than 1000 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 [1].

5.1.3 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-24-I.

5.1.4 Service conditions for indoor ALTEA VS-24-I

Altea VS-24-I is compliant with the requirements of [1, 4.1.4] regarding the service conditions for

indoor use:

Table 5.1

Solar radiation Negligible

Humidity and water vapour

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]

The Altea VS-24-I is an earthed low-power voltage transformer. The output voltage of the Altea

VS-24-I is representative of the phase to ground primary voltage.

5.3 Material

The Altea VS-24-I is epoxy resin material named EA-2470/NA whose features are reported in

Table 5.2.


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Table 5.2


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TEST

SPECIFICATION UNIT

VALUE

Note

indicative nominal **

Tollerance

Specific heat j

kg * °C

Thermal conductivity ASTM D-2303 DIN 53612

UNI 4289

W

m * °C

0,6 ÷ 0,9

Coefficient of linear

thermal expansion ASTM D-696

UNI 6061 ° C-1 ≈ 4 * 10-5

Index of temperature

( 50% flexural

resistance 20000 h) IEC 60216

DIN 53446

° C

130 -6

Glass transition

temperature IEC 61006 110 +10 -5

Heat deformation

resistance according to

Martens DIN 53458

UNI 4281 100 +15 -0

Flammability

temperature DIN 51584 > 250

of sample Glow resistance

ASTM igniz. s

D-229

Met. II spegn.

finished

piece IEC 60695

positive result

Optical density

max ASTM E 662

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 G21-G22 good

Resistance of oils, solvents, detergents, hot and cold water

good


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5.4 Safety

The Low-power voltage transformer Altea VS-24-I 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-24-I

6.1 Standard values of rated voltages [1, 5.1]

6.1.1 Rated primary voltage

The Altea-VS-24-I operates with rated primary voltage values from 6 to 20/√3 kV.

6.1.2 Rated secondary voltage

The Altea-VS-24-I rated output voltage is 1 V.

6.2 Standard values of rated voltage factor ku [1, 5.3]

6.2.1 Earthed low-power voltage transformers The

voltage factor of the Altea VS-24-I is 1,9.

6.2.2 Unearthed low-power voltage transformers N/A

for Altea VS-24-I.

6.3 Standard values of rated auxiliary power supply voltage [1, 5.4]

Power supply voltage for the Altea VS-24-I is 12 Vdc.

6.4 Standard reference values of other influencing parameters [1, 5.5]

6.4.1 Standard reference range of frequency

The accuracy class of the Altea VS-24-I is assured for frequencies ranging from 99 % to 101 % of

the rated frequency for measurements purposes and from 96 % to 102 % for protection purposes.

6.4.2 Standard reference range of auxiliary power supply voltage

The accuracy class of the Altea VS-24-I is assured for auxiliary power supply ranging from 90 % to

110 % of the rated auxiliary power supply voltage.


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6.4.3 Standard reference range of burden

The accuracy class of the Altea VS-24-I is assured for load impedances above 100 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-24-I

7.1 Insulation requirements for primary voltage [1, 6]

7.1.1 Rated insulation levels for primary terminals

The rated insulation level of the primary voltage of VS-24-I is 24 kV.

7.1.2 Power-frequency withstand voltage Power-frequency

withstand voltage is 50 kV.

7.1.3 Lightning impulse capability

The lighting impulse capability is 125 kV.

7.1.4 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 1 min.

N/A for Altea VS-24-I since one of the input terminals is connected to ground and to the case.

7.1.5 Partial discharges

The Altea VS-24-I features partial discharge levels are below 50 pC at 28,8 kV (equal to 1,2 24)

and below 20 pC at 16,6 kV (equal to 1,2 24/√3). Partial Discharge extinction level is 15,2 kV (equal to

1,1 24/√3).

7.1.6 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 115 % of the full lightning-impulse voltage.

N/A for Altea VS-24-I.


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7.1.7 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. N/A for Altea VS-24-I.

7.2 Insulation requirements for low-voltage components [1, 6.2] Available

upon special customer request.

This insulation shall meet the following requirements:

7.2.1 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 [1, 6.3]

Altea VS-24-I 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 [1, 6.4]

7.4.1 General requirements

Altea VS-24-I withstands the thermal effects caused by the following conditions:

– maximum specified ambient temperature (+ 40 °C);

– rated frequency (50/60 Hz);

– 1,2 times the rated primary voltage [1,2 20/ 3 = 13,85 kV];

– the combination of auxiliary power supply voltage and secondary burden which causes the

maximum internal power dissipation of the secondary converter (±12 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 ≥ 123 kV. N/A for Altea VS-24-I.


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7.6 Transmitted overvoltage requirements [1, 6.6]

Alta VS-24-I 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 [1, 6.7]

Altea VS-24-I 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.

7.7.1 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 [1, 6.8]

The estimated MTTF of the Altea VS-24-I is 250.000 h.

7.9 Abnormal conditions withstand capability [1, 6.9]

Depending on the technology used, the short-circuit withstand capability and overheating withstand

capability only apply to the secondary converter.



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7.10 Abnormal condition signalling [1, 6.10]

Altea VS-24-I is designed in order to avoid spurious tripping of protective relays in presence of

impulse voltages.

7.11 Mechanical requirements [1, 6.11]

These requirements apply only to low-power voltage transformers which have a highest voltage for

equipment of 72,5 kV and above.


7.12 Earthing terminals [1, 6.12]

7.12.1 Earthing of the primary voltage and primary converter

Altea VS-24-I is earthed thought the two clamping screws with diameter of 10 mm (see Fig. 1).

7.12.2 Earthing of the secondary converter N/A

for Altea VS-24-I.

8. CLASSIFICATION OF TESTS

In the following the Type tests and Routine tests performed for Altea VS-24-I are listed.

8.1 Type tests [1, 7.1]

a) lightning impulse test [1, 8.1.2];

b) switching impulse test [1, 8.1.3];

c) wet test for outdoor type low-power voltage transformers [1, 8.2]; N/A for Altea VS-24-S.

d) tests for accuracy [1, 8.3];

e) abnormal conditions withstand capability test [1, 8.4]; N/A for Altea VS-24-S.

f) radio interference voltage test [1, 8.5]; N/A for Altea VS-24-S.

g) transmitted overvoltage test [1, 8.6]; N/A for Altea VS-24-S.

h) electromagnetic compatibility tests: emission [1, 8.7.1]

i) electromagnetic compatibility tests: immunity [1, 8.7.2]

j) impulse voltage withstand test for low-voltage components [1, 8.8]

k) transient performance test [1, 8.9]:

- primary short-circuit [1, 8.9.1];


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- reclosing on a line with trapped charges [1, 8.9.2];


8.2 Routine tests [1, 7.2]

a) verification of terminal markings [1, 9.1]

b) power-frequency withstand tests on primary voltage terminals [1, 9.2]

c) partial discharge measurement [1, 9.2.4];

d) power-frequency voltage withstand test for low-voltage components [1, 9.3] Only on

insulators with sensor equipped with galvanic insulation.

e) tests for accuracy [1, 9.4]

8.3 Special tests [1, 7.3] *

a) chopped lightning-impulse test on primary voltage terminals [1, 10.1];

b) measurement of capacitance and dielectric dissipation factor [1, 10.2];

c) mechanical strength tests [1, 10.3];

* 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 1 000 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, 3.10];

b) flammability test [2, 3.12];

c) ageing and humidity test [2, 3.11].

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, 3.13];

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].


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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, 3.10];

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]; N/A for Altea VS-24-I.

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 [1, 11 – 2, 1.5]

9.1 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-24-I 1.6 kg 60044-7

Electrical Characteristics Auxiliary Power Supply

Rated Insulation Level = 24/50/125 kV Uar = ±12 V DC


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fr = 50/60 Hz Iar = 10 mA

Ia max = 15 mA

EVT Characteristics

Upr/Usr = 20/3kV / 1V φor = 0 º

Rbr = 100 kΩ ku = 1,9 / 8h

Class 0.5

9.2 Terminal markings

9.2.1 Connector type RJ45

Altea BV maintains records of all produced insulators in accordance with this standard for a

minimum of 10 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.

10. ACCURACY FOR SINGLE-PHASE ALTEA VS-24-I ELECTRONIC

MEASURING VOLTAGE TRANSFORMER [1, 12]

1 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

https://www.google.it/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjxj-LD6MTSAhWB1RoKHU0lAVwQjRwIBw&url=http://www.pacificnorthwestspine.com/rj-45-wiring-diagram-cat6/rj45-pinout-and-wiring-diagrams-t568a-pinout-cable-color-white-green-orange-blue-brown-rj-45-wiring-diagram/&psig=AFQjCNESSB2EgZwCqxKl6AqyMT2iopm5BQ&ust=1488990570429462


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The low-power voltage transformer Altea VS-24-I is in the Accuracy class 3P for protection and 0,5

for measurement, in the range of temperature ranging from - 25 to + 65 °C.

11. ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE ELECTRONIC

PROTECTIVE VOLTAGE TRANSFORMERS [1, 13]

11.1 Standard accuracy classes for electronic protective voltage transformers

Standard accuracy class for Altea VS-24-I is 3P.

11.2 Transient performance requirements

11.3.1 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-24-I will decay, within one cycle

of rated frequency, to a value of less than 10 % of the peak value before short circuit.

11.3 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.


11.4 Reclosing on a line with trapped charges N/A

for Altea VS-24-I.

END OF DOCUMENT


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Documents

TECHNICAL SPECIFICATIONS VOLTAGE LOW-POWER … Specifications VS-24-I Altea.pdf · IEC 60815 (1986) uide for the selection of insulator in respect of polluted conditions 6. IEC 60071-2