technical specifications current voltage … specification altea cvs-24-g... · 8.1.6 general...
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Smart Termination
Rev.
Date
Revision
Description Prepared
by Checked by Approved by
0 13/06/16 First issue E. Scala L. Peretto 1 27/12/2016 Drawing update,
cable features added E. Scala
TECHNICAL SPECIFICATIONS
CURRENT VOLTAGE
INSTRUMENT TRANSFORMER
CVS - 24 - G - ST
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INDEX
1. SCOPE OF THE DOCUMENT 4
2. CVS-24-G-ST DESCRIPTION 5
3. REFERENCE DOCUMENTS 6
4. OPERATIONAL CHARACTERISTICS of CVS-24-G-ST 6
5. SERVICE CONDITIONS OF THE CVS-24-G-ST 6
5.1 Service conditions 6
5.1.1 Ambient air temperature 6
5.1.2 Service conditions for indoor CVS-24-G-ST 6
5.2 Earthing system 7
5.3 Materials 7
5.4 Safety 7
6. RATING OF THE CURRENT INSTRUMENT
TRANSFORMER CVS-24-G-ST 7
6.1 Standard values of rated primary current Ipr 7
6.2 Rated continuous thermal current Icth 7
6.3 Short-time current ratings 8
6.3.1 Standard values for symmetrical short-circuit current 8
6.3.1.1 Rated short-time thermal current Ith 8
6.3.1.2 Rated dynamic current Idyn 8
6.4 Standard frequency range 8
6.5 Rated auxiliary power supply voltage Uar 8
6.6 Rated auxiliary power supply frequency 8
6.7 Standard reference range of auxiliary power supply voltage 8
6.8 Standard reference range of temperature 8
6.9 Standard values for rated phase offset 8
6.10 Rating for analogue voltage output 8
6.10.1 Standard value of rated secondary voltage Usr 9
6.10.2 Rated burden Rbr 9
7. RATING OF THE VOLTAGE INSTRUMENT TRANSFORMER
CVS 24.03.16-S 9
7.1 Standard values of rated voltages 9
7.1.1 Rated primary voltage 9
7.1.2 Rated secondary voltage 9
7.2 Standard values of rated voltage factor ku 9
7.2.1 Earthed voltage instrument transformer 9
7.3 Standard values of rated auxiliary power supply voltage 9
7.4 Standard reference values of other influencing parameters 9
7.4.1 Standard reference range of frequency 9
7.4.2 Standard reference range of auxiliary power supply voltage 9
7.4.3 Standard reference range of burden 9
7.4.4 Standard reference range of temperature 9
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8. DESIGN FEATURES OF THE CURRENT VOLTAGE INSTRUMENT
TRANSFORMER CVS-24-G-ST 9
8.1 General design features of current INSTRUMENT transformer 9
8.1.1 Rated insulation levels for primary terminals 9
8.1.2 Power-frequency withstand voltage 9
8.1.3 Lightning impulse capability 10
8.1.4 Partial discharges 10
8.1.5 Low-voltage components voltage withstand capability 10
8.1.6 General requirements for temperature rise 10
8.1.7 Electromagnetic compatibility requirements 10
8.1.7.1 Emission requirements 10
8.1.7.2 Immunity requirements 10
8.1.8 Signal-to-noise ratio 10
8.1.9 Wake-up current 11
8.2 General design features of voltage instrument transformer 11
8.2.1 Rated insulation levels for primary terminals 11
8.2.2 Power-frequency withstand voltage 11
8.2.3 Lightning impulse capability 11
8.2.4 Partial discharges 11
8.2.5 Insulation requirements for low-voltage components 11
8.2.6 Short-circuit withstand capability 11
8.2.7 Limits of temperature rise 11
8.2.7.1 General requirements 11
8.2.8 Transmitted overvoltage requirements 11
8.2.9 Electromagnetic compatibility requirements 11
8.2.9.1 Emission requirements 11
8.2.9.2 Immunity requirements 11
8.3 Reliability 12
8.4 Abnormal condition signaling 12
9. CLASSIFICATION OF TESTS 12
9.1 Type tests for current instrument transformer 12
9.2 Routine tests for the current instrument transformer 12
9.3 Type tests for the voltage instrument transformer 12
9.4 Routine tests for the voltage instrument transformer 13
10. TERMINALS MARKINGS 13
10.1 Connector type 13
10.2 Cable main features 13
11. RECORDING 13
12. MAINTENANCE REQUIREMENTS 13
13. ACCURACY FOR SINGLE-PHASE CVS-24-G-ST MEASURING
VOLTAGE INSTRUMENT TRANSFORMER 14
14 ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE PROTECTIVE
VOLTAGE INSTRUMENT TRANSFORMERS 14
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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-ST. The CVS-24-G-ST 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-ST
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2. CVS-24-G-ST 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-ST voltage instrument transformer features
Rated insulation level 24/50/125 kV
Rated primary voltage, Upn 20/√3 kV, 15/√3 kV, 10/√3 kV
Maximum voltage, Um 24 kV
Rated voltage factor, Ku 1,9 for 8h
Voltage transformer
Nominal transformation ratio, Kn 10000:1
Accuracy class 0,5 for measurement 3P for
protection.
The maximum deviation with respect to the prototype is 0.1% for ratio
error and 0,1° for phase error.
CVS-24-G-ST current instrument transformer features
Rated primary current, Ipr 300 A
Rated primary time constant for transient performance, τpr 40 ms
Rated short time withstand thermal current, Ith 16 kA / 3s
Rated Dynamic current, Idyn 31,5 kA
Current transformer
Nominal transformation ratio, Kra 1000 A / 31 mV
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-ST other features
Nominal frequency 50 - 60 Hz
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Weight 1,5 kg
Applicable Standards IEC 60044-7; 60044-8
3. REFERENCE DOCUMENTS
The following reference documents were taken into consideration for the definition of CVS-24-GST
operational characteristics:
1. IEC 60044-7 (1999) "Instrument transformers ‐ Part 7: voltage transformers";
2. IEC 60044-8 (2002) "Instrument transformers ‐ Part 7: current transformers";
3. IEC 60060‐1 (2010) “High voltage test techniques – Part 1: General definitions and test requirements”;
4. IEC 60815 (1986) “Guide for the selection of insulator in respect of polluted conditions”
5. IEC 60071-2 (1996) “Insulation co‐ordination ‐ Part 2: Application guide”
6. IEC 60044-6 “Instrument transformers – Part 6: Requirements for protective current transformers for transient performance”
7. IEC 60044-1, Instrument transformers – Part 1: Current transformers
8. ENEL Spec. DJ5400 rev 0 (2013) “Smart Termination”
4. OPERATIONAL CHARACTERISTICS of CVS-24-G-ST
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-ST measuring current voltage instrument
transformer;
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- Additional requirements for single-phase CVS-24-G-ST protective current voltage
transformer.
5. SERVICE CONDITIONS OF THE CVS-24-G-ST
According to [1, 2 and 3] CVS-24-G-ST 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.
5.1.2 Service conditions for indoor CVS-24-G-ST CVS-24-G-ST is in compliance with the requirements of [1, 4.1.4 and 2, 4.2.4] 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 and 2, 4.3]
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The CVS-24-G-ST 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-ST 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-ST 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 INSTRUMENT TRANSFORMER CVS-24-G-ST
6.1 Standard value for rated primary current Ipr [2, 5.1.1]
The CVS-24-G-ST 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]
6.3.1 Standard values for symmetrical short-circuit current
6.3.1.1 Rated short-time thermal current Ith. The standard r.m.s. value is 16 kA and is in
compliance with [7].
6.3.1.2 Rated dynamic current Idyn. The value of rated dynamic current is 31,5 kA.
6.4 Standard frequency range [2, 5.1.5]
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The accuracy class of the CVS-24-G-ST 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-ST does not need auxiliary power supply.
6.6 Rated auxiliary power supply frequency [2, 5.1.8] The combined sensor CVS-24-G-ST 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, 5.1.10]
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.
6.10 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 INSTRUMENT TRANSFORMER CVS-24-G-ST
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7.1 Standard values of rated voltages [1, 5.1]
7.1.1Rated primary voltage
The CVS-24-G-ST can operate with rated primary voltage values equal to 20/√3 kV, 15/√3 kV or
10/√3 kV.
7.1.2 Rated secondary voltage
The CVS-24-G-ST output voltage is up to 2/√3 V, 1.5/√3 V or 1/√3 V in accordance with 7.1.1.
7.2 Standard values of rated voltage factor ku [1, 5.3]
7.2.1 Earthed current voltage transformers The voltage Factor of the CVS-24-G-ST is 1,9.
7.3 Standard values of rated auxiliary power supply voltage [1, 5.4] The
combined sensor CVS-24-G-ST does not need auxiliary power supply.
7.4 Standard reference values of other influencing parameters [1, 5.5]
7.4.1 Standard reference range of frequency
The accuracy class of the CVS-24-G-ST is assured for frequencies ranging from 99 % to 101 % of
the rated frequency for measurements purposes and from 96 % to 102 % for protection purposes.
7.4.2 Standard reference range of auxiliary power supply voltage
NA
7.4.3 Standard reference range of burden
The minimum value for rated burden is 1 MΩ -2%.
7.4.4 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 INSTRUMENT
TRANSFORMER CVS-24-G-ST
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-ST is 24/50/125 kV.
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8.1.2Power-frequency withstand voltage
Power-frequency withstand voltage is 50 kV.
8.1.3Lightning impulse capability
The lighting impulse capability is 125 kV.
8.1.4Partial discharges
The CVS-24-G-ST features partial discharge levels below 10 pC at 20 kV.
8.1.5Low-voltage components voltage withstand capability [2, 6.1.1.3]
NA
8.1.6 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%).
8.1.7 Electromagnetic compatibility requirements [2, 6.1.5] The CVS-24-G-ST is in compliance with all the requirements concerning the immunity and
emissions. In particular the following tests have been carried out and passed.
8.1.7.1 Emission requirements
NA
8.1.7.2 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.
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8.1.8 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-ST is 24/50/125 kV.
8.2.2Power-frequency withstand voltage
Power-frequency withstand voltage is 50 kV.
8.2.3Lightning impulse capability
The lighting impulse capability is 125 kV.
8.2.4Partial discharges
The CVS-24-G-ST features partial discharge levels below 10 pC at 20 kV.
8.2.5Insulation requirements for low-voltage components [1, 6.2]
NA
8.2.6Short-circuit withstand capability for low-voltage components [1, 6.3]
NA
8.2.7 Limits of temperature rise [1, 6.4]
8.2.7.1 General requirements
The CVS-24-G-ST 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-ST is protected against the emissions of overvoltages transmitted from the primary to
the secondary output or to the power supply.
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8.2.9 Electromagnetic compatibility requirements [1, 6.7]
The CVS-24-G-ST 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.
8.2.9.1 Emission requirements
NA
8.2.9.2 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.
8.3 Reliability [1, 6.8 – 2, 6.1.9]
The estimated MTTF of the CVS-24-G-ST is > 250.000 h.
8.4 Abnormal condition signalling [1, 6.10]
The CVS-24-G-ST is designed in order to avoid spurious tripping of protective relays in presence of
impulse voltages.
9. CLASSIFICATION OF TESTS
In the following the Type tests and Routine tests performed for the CVS-24-G-ST are listed.
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9.1 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
1 GND 2 GND
3 Vout- (CS)
4 Vout+ (CS)
5 Vout- (VS)
6 Vout+ (VS)
7 NC
8 NC
The connector is RJ45 type. Refer to the Figure for connections pin-out.
PI N 1
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10.2 Cable main features
Output signal cable S/UTP patch cable - Cat. 5E
Temperature range [-40; +105]°C; industrial use
Cable length 4,00 m (-0,00; +0,20) m
Signal cable termination 8 pins RJ45 plug
11 RECORDING
Records of all produced CVS-24-G-ST 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-ST is a disposable device. No sub-parts can be
replaced.
13 ACCURACY FOR SINGLE-PHASE CVS-24-G-ST MEASURING CURRENT
VOLTAGE INSTRUMENT TRANSFORMER [1, 12 – 2, 12]
The current voltage instrument transformer CVS-24-G-ST is in the accuracy class reported in the
Table 13.1 both for current and voltage measurements.
Table 13.1
Accuracy
class
Percentage current (ratio) error (±)
at the harmonics shown below Phase displacement (±) at harmonics shown below
(degree)
1st to 2nd harmonic
3rd to 50th harmonic
1st to 2nd harmonic
3rd to 50th harmonic
Special
quality
metering
1%
5 %
1
5
See Appendix D.4.1.2. of [2].
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14 ADDITIONAL REQUIREMENTS FOR SINGLE-PHASE ALTEA CVS-24-G-ST
PROTECTIVE CURRENT VOLTAGE INSTRUMENT TRANSFORMERS [1, 13 –
2, 13]
The current voltage instrument transformer CVS-24-G-ST is in the accuracy class 3P for the voltage
and 5P20 for the current.
END OF DOCUMENT