Test Performance Record for LAPEM
NXCT 345 kV
8.7.4 Impulse-voltage withstand test
The impulse-voltage withstand tests shall be made by applying the voltage given in 6.1.1.3.
A standard lightning impulse in accordance with IEC 60060 shall be used. The parameters
are:
•
front time: 1,2 µs ± 30 %
•
time to half value: 50 µs ± 20 %
•
output impedance: 500 ?± 10 %
•
output energy: 0,5 J ± 10 %
The length of each test lead shall not exceed 2 m.
The impulse voltage shall be applied to the appropriate points accessible from the outside of
the device, the other circuits and the exposed conductive parts being connected to earth.
During the test, no input or auxiliary energizing quantity shall be applied to the device.
Three positive and three negative impulses shall be applied at intervals of not less than 5 s.
Acceptance criteria: no flashover is accepted and after the test, the ECT shall still comply
with basic accuracy tests.
Summary of Low Voltage Components Voltage Withstand Test:
All of NxtPhase Generation 3 electronics have been designed to meet the requirements of this
section of the IEC Standard. At this time, no test results are available, as the testing is not
completed. Test results will be provided as soon as reports are generated once testing is
complete.
Original Low Voltage Components Voltage Withstand Test Report:
See comment above.
© 2005 NxtPhase T&D Corporation
Page 21
Test Performance Record for LAPEM
NXCT 345 kV
The IEC Standard Requirements
8.8 EMC tests
8.8.1 General
The tests shall be made to prove the compliance with 6.1.5.
In many cases an electronic transformer may be divided into a number of major
subassemblies such as, for example, circuits located in control cubicles and circuits located in
the switchgear area. EMC tests relevant for the applied technology of electronic transformer
have to be carried out on each major subassembly the full electronic transformer being in
operation or the missing subassemblies being simulated. An example of major subassembly
division is given in figure 15.
(1)
(2)
Sub-assembly 2
Sub-assembly 1
(2)
(7), (8)
(3)
(4), (5), (6)
(4), (5), (6),(7), (8)
Link between
(3)
Sub-assembly 1 and 2
Switchyard area
Control cubicle area
(1) HV line
(2) Enclosure port
(3) Ground port
(4) Signal port
(5) Command port
(6) Communication port
(7) a.c. power port
(8) d.c. power port
Sub-assembly 1 : "outdoor part" in switchgear area
Sub-assembly 2 : "indoor part" in control cubicle area
Figure 15 – Example of subassembly subjected to EMC tests
© 2005 NxtPhase T&D Corporation
Page 22
Test Performance Record for LAPEM
NXCT 345 kV
8.8.2 General conditions during EMC tests
The general conditions for EMC tests are described in IEC 61000-4-1 and CISPR 11.uring the
EMC tests, the length of cable between the ECT and test equipment and between subassembly
1 and 2 should be the maximum specified by the manufacturer and the arrangement of the
cable shall, as far as practicable, represent in-service conditions.
8.8.3 EMC emission tests
An emission test will be performed according to the CISPR 11 testing procedure. The test
limits will be those of group 1 class A. The test shall preferably be performed on the complete
assembly but for ease of testing in case one of the possible subassemblies contains no
electrical parts, that test can be performed on the remaining subassemblies.
Summary of EMC Emission Tests:
Test Result: Pass
Generation 3 Electronics Serial # Prototype
Rated Voltage: 69 kV Rated Current: 2000 A
Protocol Labs report #: 03056, Date: 4/26/2005
Test date: 1/31/2005 through 2/25/2005
Basic Standards:
Conducted Emissions (CISPR 11/22 Class A):
Radiated Emissions (CISPR 11/22 Class A):
Conducted Emissions (FCC Part 15/B Class A):
Radiated Emissions (FCC Part 15/B Class A):
Conducted Emissions (ICES 003 Class A):
Radiated Emissions (ICES 003 Class A):
Conducted Emissions (EN55011/22 Class A):
Radiated Emissions (EN55011/22 Class A):
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Electrostatic Discharge (61000-4-2) Level 4:
Electrostatic Discharge (IEEE C37.90.3) Level 4:
Electrostatic Discharge (IEC 60255-22-2) Level 4:
Pass [X]
Pass [X]
Pass [X]
Fail [ ]
Fail [ ]
Fail [ ]
[
[
[
[
[
[
[
[
]
]
]
]
]
]
]
]
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
[
[
[
[
[
[
[
[
]
]
]
]
]
]
]
]
N/A [ ]
N/A [ ]
N/A [ ]
Testing was performed per the following standards, pursuant to IEC 60044-8:2002 and EN
50263:2000.
Radiated and Power Line Conducted Emission tests were performed using measurement
procedure CISPR 11. Radiated emissions were performed on an open area 10m test site.
Table 5.2-1 Emissions Test Results - International
Test
Standard
Description
Result
Conducted
Emissions
CISPR 11/22
Class A Limits
EN55011/22
Class A Limits
The Conducted Emissions are measured
on the phase and Neutral Power lines in
the 0.15 - 30.0 MHz range.
Pass
Radiated
Emissions
CISPR 11/22
Class A Limits
EN55011/22
Class A Limits
The radiated emissions are measured in
the 30-1000MHz range.
Pass
© 2005 NxtPhase T&D Corporation
Page 23
Test Performance Record for LAPEM
NXCT 345 kV
Test
Standard
Description
Result
Power Line
Harmonics
EN 61000-3-2
Class D Limits
Maximum 1.08, 2.3, 0.43, 1.14, 0.3, 0.77,
0.23 A.... for 2nd to nth Harmonic
N/A
DC
Powered
Power line
Fluctuations
(Flicker)
EN 61000-3-3
Pst <1, Plt < 0.65
Maximum 3% total Harmonic Distortion
N/A
DC
Powered
Original EMC Emission Test Report:
See Appendix A – NXCT Gen 3.0 Project, Current Transducer Systems for Metering and
Protection, Applications EMC Compliance Test Report –
D00559R00.00
The IEC Standard Requirements
8.8.4 EMC immunity tests
The test shall be performed on a port-by-port basis, guidance for the identification of ports
being given in figure 15.
8.8.4.1 Harmonic and interharmonic disturbance test
The test shall be performed according to the test procedure of IEC 61000-4-13. The severity
level is class 2 (full harmonic distortion 10 %). The assessment criterion is given in 6.1.5.3.
8.8.4.2 Slow voltage variation test
The test shall be performed according to the test procedure of IEC 61000-4-11 for a.c. power
supply and IEC 61000-4-29 for d.c. power supply. The voltage variations used are from +10
% to 20 % of the nominal voltage of the a.c. power supply and from +20 % to 20 % of the
nominal voltage of the d.c. power supply. The assessment criterion is given in 6.1.5.3.
8.8.4.3 Voltage dips and short interruption test
The test shall be performed according to the test procedure of IEC 61000-4-11 for a.c. power
supply and IEC 61000-4-29 for d.c. power supply.
•
The voltage dip used for the test is 30 % of the nominal voltage of the a.c. power supply
during 0,02 s. The voltage interruption test is performed during 0,1 s for a.c. power
supply.
•
The voltage dip used for the test is 40 % of the nominal voltage of the d.c. power supply
during 0,05 s.
•
The voltage interruption test is performed during 0,05 s or 0,02 s for d.c. power supply.
•
The assessment criterion is given in 6.1.5.3.
© 2005 NxtPhase T&D Corporation
Page 24
Test Performance Record for LAPEM
NXCT 345 kV
8.8.4.4 Surge immunity test
The test shall be performed according to the test procedure of IEC 61000-4-5. The test
generator to be used is the combination wave (hybrid) generator (IEC 61000-4-5, 6.1) with
standard 1,2/50 s voltage waveform (open-circuit) and 8/20 s current waveform (shortcircuit). The test level is according to installation class 4 (4 kV common mode, 2 kV
differential mode). The assessment criterion is given in 6.1.5.3.
8.8.4.5 Electronic fast transient/burst test
The test shall be performed according to the test procedure of IEC 61000-4-4, the test level
being class 4 (4 kV test voltage at 2,5 k Hz repetition rate on power supply port and 2 kV at 5
k Hz repetition rate on input/output signal, data and control ports – common mode). The test
will be carried out using the coupling/decoupling network on the power supply port and the
capacitive coupling clamp on I/O and communication ports. The assessment criterion is given
in 6.1.5.3.
8.8.4.6 Oscillatory waves immunity test
The test shall be performed according to the test procedure of IEC 61000-4-12. The test
generator to be used is the damped oscillatory wave generator (IEC 61000-4-12, 6.1.2). The
test voltage will be 2,5 kV common mode and 1 kV differential mode both for power supply
and control/signal lines (as in IEC 60255-22-1). Test frequency will be 1 M Hz at 400/s
repetition rate (as in IEC 60255-22-1). The assessment criterion is given in 6.1.5.3.
8.8.4.7 Electrostatic discharge test
The test shall be performed according to the test procedure of IEC 61000-4-2. The test level is
class 2 (4 kV test voltage), which gives protection in antistatic environments (like concrete)
for relative humidity as low as 10 % (see also IEC 61000-4-2, clause A.4). The assessment
criterion is given in 6.1.5.3.
8.8.4.8 Power-frequency magnetic field immunity test
The test shall be performed according to the test procedure of IEC 61000-4-8. Test level is 5
(100 A/m steady state and 61 000 A/m ? ?1). The assessment criterion is given in 6.1.5.3.
8.8.4.9 Pulse magnetic field immunity test
The test shall be performed according to the test procedure of IEC 61000-4-9. Test level is 5
(61 000 A/m peak). The assessment criterion is given in 6.1.5.3.
8.8.4.10 Damped oscillatory magnetic field immunity test
The test shall be performed according to the test procedure of IEC 61000-4-10. Test level is
class 5 (100 A/m test field). The assessment criterion is given in 6.1.5.3.
8.8.4.11 Radiated, radiofrequency, electromagnetic field immunity test
The test shall be performed according to the test procedure of IEC 61000-4-3. Test level is
class 3 (10 V/m field strength). The assessment criterion is given in 6.1.5.3.
© 2005 NxtPhase T&D Corporation
Page 25
Test Performance Record for LAPEM
NXCT 345 kV
Summary of EMC Immunity Tests:
Test Result: Pass
Generation 3 Electronics Serial # Prototype
Rated Voltage: 69 kV Rated Current: 2000 A
Protocol Labs report #: 03056, Date: 4/26/2005
Test date: 1/31/2005 through 2/25/2005
Radiated RF Susceptibility (61000-4-3) Level 3:
Radiated RF Susceptibility (IEC 60255-22-3) Level 3:
Radiated RF Susceptibility (IEEE C37.90.2) 35V/m:
Radiated RF Susceptibility (IEEE C37.92) 35V/m:
Electrical Fast Transient/Burst (61000-4-4) Level 4:
Electrical Fast Transient/Burst (IEEE C37.90.1) Level 4:
Electrical Fast Transient/Burst (IEC 60255-22-4) Level 4:
Surge Immunity (61000-4-5) Level 4:
Surge Immunity (IEC 60255-22-5) Level 4:
Conducted RF Immunity (61000-4-6) Level 3:
Conducted RF Immunity (IEC 60255-22-6) Level 3:
Power Frequency Magnetic Field Immunity (61000-4-8)
Level 5:
Pulse Magnetic Field Immunity (61000-4-9) Level 5:
Damped Oscillatory Magnetic Field (61000-4-10) Level 5:
Oscillatory Waveforms Immunity (61000-4-12) Level 3:
Oscillatory Waveform Immunity (IEC 60255-22-1) Level 3:
Surge Withstand Capability, Oscillatory Waveform (IEEE
C37.90.1)
Voltage Dips Interruptions & Variations (61000-4-29),
200ms Interrupt
Voltage Dips Interruptions & Variations (61000-4-29),
1200ms Interrupt
Voltage Interruptions (IEC 60255-11) 200ms Interrupt
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Fail
[
[
[
[
[
[
[
[
[
[
[
]
]
]
]
]
]
]
]
]
]
]
N/A [
N/A [
N/A [
N/A [
N/A [
N/A [
N/A [
N/A [
N/A [
N/A [
N/A [
]
]
]
]
]
]
]
]
]
]
]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Pass [X]
Fail
Fail
Fail
Fail
Fail
[
[
[
[
[
]
]
]
]
]
N/A
N/A
N/A
N/A
N/A
]
]
]
]
]
Pass [X]
Fail [ ]
N/A [ ]
Pass [X]
Fail [ ]
N/A [ ]
Pass [X]
Pass [X]
Fail [ ]
Fail [ ]
N/A [ ]
N/A [ ]
[
[
[
[
[
Tests were conducted on a sample of the equipment for the purpose of demonstrating
compliance with the following standards.
Testing was performed per the following standards, and the EUT responded as noted.
© 2005 NxtPhase T&D Corporation
Page 26
Test Performance Record for LAPEM
NXCT 345 kV
Table 7.1-1 Immunity Test Summary
Criterion
Applicable
Standard
ESD
EN 61000-4-2
IEC 60255-222
IEEE C37.90.3
Radiated
Immunity
EN 61000-4-3
IEC 60255-223
Radiated
Immunity
IEEE C37.90.2
IEEE C37.92
EFT/Burst
EN 61000-4-4
IEC 60255-224
IEEE C37.90.1
Surge
Immunity
EN 61000-4-5
IEC 60255-225
Conducted RF
EN 61000-4-6
IEC 60255-226
Power
Frequency
Magnetic Field
EN 61000-4-8
Magnetic
Pulse
EN 61000-4-9
Damped
Oscillatory
Magnetic Field
EN 61000-4-10
Oscillatory
Immunity
EN 61000-4-12
IEC 60255-221
IEEE C37.90.1
Slow Voltage
Variations
EN 61000-4-29
Voltage
Interruptions
EN 61000-4-29
IEC 60255-11
Voltage Dips
EN 61000-4-29
Test or
Measurement
Required
Level
Air Discharge
+/- 15 kV
Contact Discharge
+/- 8 kV
Modulated
Frequency
Field
1 kHz 80% AM
10 V/m
Subject to electromagnetic field
of 35 V/m from 25 MHz to 1000
MHz
Keyed
Keyed
35 V/m
EFT/Burst of 4.0 kV is coupled to
the all I/O and control signals,
respectively and 4.0 kV is
injected on the Power Line.
Direct injection
+/- 4.0 kV
Coupling Clamp
4 kV Positive and Negative
Surges are injected in Common
Mode, Differential Mode, as well
as shielded lines
All lines are RF coupled to
10Vrms level from 0.150 – 80
MHz.
Description
Air Discharge up to 15 kV and
Contact Discharge at 8 kV at
several locations with 10 positive
and 10 negative discharges per
location.
Subject to electromagnetic field
of 10V/m from 80 MHz to 1000
MHz and 1.4 GHz to 2.0 GHz.
For magnetically susceptible
apparatus only. Subject to a
magnetic Field of 100A (RMS)
A/m for 60 seconds and 1000
(RMS) A/m for 3 seconds.
For magnetically susceptible
apparatus only. Subject to
magnetic s pulse Field of 1000
A/m is applied
Magnetic field-tests for electronic
equipment in H.V. sub-stations.
Applied on the X, Y and Z-axis.
Repetitive, damped oscillatory
waves occurring mainly in power,
control and cables installed in
H.V. and M.H. sub –stations.
The DC voltage is varied
The voltage on the power supply
is interrupted for a set amount of
time
The voltage and current are
varied for a set amount of time
© 2005 NxtPhase T&D Corporation
(See Pass/Fail
Criteria Section)
Result
Metering
Protection
B
A
Complies
A
A
Complies
A
A
Complies
+/- 4.0 kV
B
A
Complies
Line to Ground
Line to Line
Applied to the
Shield
+/- 4.0 kV
+/- 2.0 kV
+/- 4.0 kV
B
A
Complies
Modulated
Frequency
Field
1 kHz 80% AM
10 Vrms
B
A
Complies
A
A
Complies
B
A
Complies
B
A
Complies
B
A
Complies
A
A
Complies
A
50ms
A
200m
s
Complies
A
A
Complies
Applied on all 3
axis
100 A/m for 60
sec
1000 A/m for 3
sec
Applied on all 3
axis
1000 A/m
Applied on all 3
axis
100 A/m
Common Mode:
2.5 kV
Differential Mode
2.5 kV
Voltage Varied
+/- 20%
Voltage interrupted
100% for up to
200ms
Voltage Dips
50% for 100ms
Current Dips
60% for 50ms
Page 27
Test Performance Record for LAPEM
NXCT 345 kV
Original EMC Emission Test Report:
See Appendix A – NXCT Gen 3.0 Project, Current Transducer Systems for Metering and
Protection, Applications EMC Compliance Test Report –
D00559R00.00
The IEC Standard Requirements
8.9 Accuracy test
8.9.1 General
The following accuracy tests are applied to measuring electronic current transformer and to
protective electronic current transformer. Test circuits are given in annex B for digital output
and annex C for analogue output.
Basic accuracy tests
8.9.1.1 Basic accuracy tests for measuring electronic current transformer
To prove compliance with 12.2, tests shall be made at each value of current given in tables 19,
20 and 21 at rated frequency, at rated burden (if relevant), and at ambient temperature, unless
otherwise specified. Current transformers having rated primary current factor greater than 1,2
shall be tested at rated primary extended current instead of 1,2 times the rated primary current.
NOTE The test can be carried out using a pure delay time device inserted between the reference transformer and the
accuracy measurement system.
8.9.1.2 Basic accuracy test for protective electronic current transformer
To prove compliance with 13.1.3, the test shall be made at rated primary current (see table
22), at rated frequency, at rated burden (if relevant) and at ambient temperature.
NOTE The test can be carried out using a pure delay time device inserted between the reference transformer and the
accuracy measurement system.
8.9.2 Temperature cycle accuracy test
In addition to the basic accuracy tests made in accordance with 8.9.2, the temperature cycle
accuracy test shall be performed in the following conditions:
?
• at rated frequency;
•
?at rated current or rated primary extended current applied continuously;
•
?at rated burden (if relevant);
•
?with indoor and outdoor components exposed to their specific maximum and minimum
ambient air temperature. A cycle test in accordance with figure 16 shall be performed.
© 2005 NxtPhase T&D Corporation
Page 28
Test Performance Record for LAPEM
NXCT 345 kV
Figure 16 – Temperature cycle accuracy test
Minimum temperature variation rate is 5 K/h. It can be higher only if allowed by the
manufacturer.
The thermal time constant shall be declared by the manufacturer.
NOTE Time needed to stabilize the temperature of the electronic current transformer depends mainly on the size and
construction of the transformer.
For electronic current transformers, partially indoor, partially outdoor, the tests shall be made
for indoor and outdoor parts, each one at both extremes of relevant temperature range,
respecting the following rules:
•
ambient air temperature for both parts;
•
•
maximum temperature for indoor part when maximum temperature for outdoor part;
minimum temperature for indoor part when minimum temperature for outdoor part.
In normal service conditions the measured error of every measuring point should be within
the limits of the relevant accuracy class.
8.9.3 Test for accuracy versus frequency
In addition to the basic accuracy tests made in accordance with 8.9.2, tests for accuracy shall
be made at the two extremes of standard reference range of frequency given in 5.1.5, at rated
current, at rated burden (if relevant) and at constant ambient temperature.
The error shall be within the limits of the relevant accuracy class.
NOTE Measurement with different frequencies are performed with a test circuit . For the tests, accuracy
measurement system calibrated at rated frequency may be acceptable.
8.9.4 Test for accuracy in relation to replacement of components
To prove compliance with clause 0 the following test shall be performed. The ability of the
electronic current transformer to fulfill its accuracy class when some of its components are
replaced shall be proven by means of an accuracy test at room temperature, rated frequency,
rated current and rated burden (if relevant).
© 2005 NxtPhase T&D Corporation
Page 29
Test Performance Record for LAPEM
NXCT 345 kV
8.9.5 Test for signal-to-noise ratio
To prove compliance with 6.1.9 a test for signal-to-noise ratio shall be performed. The test
procedure shall be agreed upon between manufacturer and user. See D.2.3 for guidance.
8.10 Additional accuracy tests for protective electronic current transformers
8.10.1 Test for composite error
Tests shall be made at rated primary current to prove compliance with 13.1.3 in respect of
current error and phase error.
Compliance with the limits of composite error given in table 21 shall be demonstrated by a
direct test in which a substantially sinusoidal current equal to the rated accuracy limit primary
current is passed through the primary terminals with rated burden (if relevant).
The test may be carried out on an ECT similar to the one being supplied, except that reduced
insulation may be used provided that the same geometrical arrangement is retained.
NOTE Where very high primary currents and a single-bar primary conductor of ECT are concerned, the distance
between the return primary conductor and the ECT should be taken into account from the point of view of
reproducing service conditions.
8.10.2 Test for transient performance
Compliance with the limits of instantaneous error up to t′?and/or t” and at accuracy limit
condition given in table 21 shall be demonstrated by a direct test in which a transient current
defined in 3.3.11 is passed through the primary terminals with rated burden (if relevant), rated
primary short-circuit current, rated primary time constant and rated duty cycle.
NOTE Where very high primary currents and a single-bar primary conductor of ECT are concerned, the distance
between the return primary conductor and the ECT should be taken into account from the point of view of
reproducing service conditions.
© 2005 NxtPhase T&D Corporation
Page 30
Test Performance Record for LAPEM
NXCT 345 kV
Summary of Accuracy Tests:
Test Result: Pass, meets 0.2S class
CT serial #: D0XXXXR00.00-001
Rated Voltage: 345 kV Rated Current: 2000 A
Powertech report #: 14132-03-REP2, Date: 4/25/2003
Test date: 1/23/2003 through 1/27/2003
NXCT accuracy tests, in accordance with IEC 60044-8 (2002), were performed throughout a
battery of type tests required by the IEC standard. The NXCT was a metering class CT with 4V
and 1A outputs at rated current.
© 2005 NxtPhase T&D Corporation
Page 31
Test Performance Record for LAPEM
NXCT 345 kV
Test Result: Pass, meets 0.2S class
CT serial #: D0XXXXR00.00-001
Rated Voltage: 345 kV Rated Current: 2000 A
Powertech report #: 14132-03-REP3, Date: 4/25/2003
Test date: 1/23/2003
A linearity test was performed on the NXCT in accordance with IEC 60044-8 (2002). The results
are presented in the table below.
Linearity Test Results:
© 2005 NxtPhase T&D Corporation
Page 32
Test Performance Record for LAPEM
NXCT 345 kV
Test Result: Pass, meets 0.2S class
CT serial #: D0XXXXR00.00-001
Rated Voltage: 345 kV Rated Current: 2000 A
Powertech report #: 14132-03-REP4, Date: 4/25/2003
Test date: 3/28/2003
A temperature cycle test was performed on the NXCT in accordance with IEC 60044-8 (2002).
The results are presented in the charts below.
The test current was 1200A.
© 2005 NxtPhase T&D Corporation
Page 33
Test Performance Record for LAPEM
NXCT 345 kV
Test Result: Pass
CT serial #: D0XXXXR00.00-001
Rated Voltage: 345 kV Rated Current: 2000 A
Powertech report #: 14132-03-REP1, Date: 4/25/2003
Test date: 1/24/2003
A temperature rise test at 3000 A was performed on the NXCT in accordance with IEC 60044-8
(2002) and IEEE C57.13. The results are presented in the table below.
© 2005 NxtPhase T&D Corporation
Page 34
Test Performance Record for LAPEM
NXCT 345 kV
Test Result: Pass, class A
CT serial #: D00246R00-420-001.
Rated Voltage: 420 kV Rated Current: 2000 A
NxtPhase Document #: D00341R00.00, Date8/29/2003
Test date: 9/21/2003
A temperature rise test at 4000 A was performed on the NXCT in accordance with IEC 60044-8
(2002) and IEEE C57.13. The NXCT was a protection class CT with a 0.2 V output at rated
current.
The NXCT passed the temperature rise test at 4000 Arms 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 60044-8 industry standard.
Original Accuracy Test Reports:
© 2005 NxtPhase T&D Corporation
Page 35
T1-Other Document
TEMPERATURE-RISE TEST (4000 A)
Doc #: D00341R00.00
Released Status: Preliminary
Author: Allen Rose
1.
Revision History
Revision
Level:
R00.00
2.
Approver(s): Eric Hadley, Jim Blake
Revision Date:
(YYYY-MM-DD)
2003-08-29
Sections
Affected:
all
Description of Change:
First Document Release
Revised by:
AHR
Introduction
This document reports the results of a temperature-rise test performed on a 2 turn protection
NXCT on September 21, 2003. The test witnesses are Allen Rose, Eric Hadley, and Jim
Blake. The NXCT has a serial number of D00246R00-420-001.
3.
Scope
The test was performed in accordance with sections 5.1.6, 6.1.2, and 8.2 of the IEC
60044-8 industry standard with a 4000 Arms 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 #D00246R00-420-001 passed the temperature rise test at 4000 Arms 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 60044-8 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 60044-8
6.
Title
Instrument transformers – Part 8: electrical current transducers
Definitions
Term
NXCT
DVM
7.
Definition
NxtPhase Current Transducer
Digital volt meter
Test Metrology
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 %.
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8.
Test diagram
Transformer
Isolated
Current
Source
4000 A
NXCT
2000 A :0.2 V
Knopp
5000:1
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
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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 rise test data
80
Slope 0.45 oC/h
Temperature (oC)
70
Bus Bar
Clamp Base
Air
Head
60
50
40
30
20
8
10
12
14
16
18
20
Time (h)
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22
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.
84
Scale Factor Error (%)
0.8
Scale factor error
Calibration points
Bus Bar
Head
0.6
0.4
0.2
70
56
0
-0.2
42
-0.4
-0.6
28
-0.8
-1
14
10
15
20
25
30
Time (h)
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Temperature (oC)
1
Test Performance Record for LAPEM
NXCT 345 kV
The IEC Standard Requirements
8.11 Verification of the protection
8.11.1 Verification of the IP coding
In accordance with the requirements specified in 6.1.13.1 and 6.1.13.2, tests shall be
performed in accordance with IEC 60529 on the enclosures of all parts of the ECT fully
assembled as under service conditions.
8.11.2 Mechanical impact test
In accordance with the requirements specified in 6.1.13.3, enclosures for indoor installation
shall be subjected to an impact test. Three blows are applied to points of the enclosure that are
likely to be the weakest points. Devices such as connectors, displays, etc. are excepted.
The use of a spring-operated impact test apparatus as defined in IEC 60068-2-75 is
recommended.
After the test, the enclosure shall show no breaks and the deformation of the enclosure shall
not affect the normal function of the electronic current transformer, and shall not reduce the
specified degree of protection. Superficial damage, such as removal of paint, breaking of
cooling ribs or similar parts, or depression of small dimension can be ignored.
Summary of Verification of the Protection Tests:
All of NxtPhase Generation 3 electronics have been designed to meet all of the
requirements of this section of the IEC Standard. At this time, no test results are
available, as the testing is not completed. Test results will be provided once testing is
complete and as soon as reports are generated
Original Verification of the Protection Test Report:
See comment above.
The IEC Standard Requirements
8.12 Tightness tests
The purpose of tightness tests is to demonstrate that the absolute leakage rate F does not
exceed the specified value of the permissible leakage rate Frel (6.1.11).
For gas-filled electronic current transformer, in general, only cumulative leakage
measurements allow calculation of leakage rates. For the application of an adequate test
method, reference is made to IEC 60694, 6.8 and to IEC 60068-2-17.
For oil-filed electronic current transformer, the tightness test shall be a type test on the
electromagnetic unit assembled as for normal service, filled with the liquid specified. A
minimum pressure of (0,5 ±0,1) X105 Pa above the maximum operating pressure shall be
maintained during 8 h inside the e.m.u. The e.m.u. shall be considered to have successfully
passed the test if there is no evidence of leakage.
© 2005 NxtPhase T&D Corporation
Page 36
Test Performance Record for LAPEM
NXCT 345 kV
Summary of Tightness Tests:
These tests are not applicable to the NXCT equipment, as they use no oil or gas for
insulation. The NXCT is built with a solid dielectric composite column insulator.
The IEC Standard Requirements
8.13 Vibration tests
8.13.1 Vibrations test for secondary parts
The secondary converter, the merging unit and secondary power supply are generally
comparable to electrical secondary equipment in the substation and shall be tested in
accordance with IEC 60068-2-6 with the secondary parts operating in the normal service
condition.
8.13.2 Vibration test for primary parts
The test arrangement shall, as far as reasonably practicable, represent the worst-case service
condition in respect of vibration. Vibration levels will vary depending on connection
arrangements, insulation type, and for circuit breakers, the actuation principle (spring
mechanisms are considered to generate higher vibration levels).
8.13.3 Vibration test for primary parts during short-time current
This test is performed to determine that the ECT operates correctly in the presence of
vibration resulting from busbar vibration caused by short-time current electromagnetic forces.
This test can be carried out in conjunction with short-time current test or composite error test.
5 ms after the last opening of the circuit-breaker, the r.m.s. value of the secondary output
signal of the ECT at rated frequency calculated over one period, which should theoretically be
“0”, shall not exceed 3 % of the rated secondary output. To represent the worst-case condition
with respect to vibration, the ECT should be connected via a rigid connection to the circuitbreaker.
8.13.4 Vibration tests for primary parts mechanically coupled to a circuit- breaker
8.13.4.1 General
These tests shall also apply to GIS switchgear, medium voltage switchgear and dead tank
circuit -breaker mounted ECTs.
8.13.4.2 During operation
This test is performed to determine that the ECT operates correctly in the presence of
vibration resulting from circuit-breaker operation.
The circuit -breaker shall be operated through one duty cycle (open-close-open) without
current. 5 ms after the last opening of the circuit -breaker, the output signal of the ECT which
should theoretically be “0”, shall not exceed 10 % of peak value of the rated secondary
output. To represent the worst-case condition in respect of vibration, the circuit-breaker
should be connected via a flexible conductor.
© 2005 NxtPhase T&D Corporation
Page 37
Test Performance Record for LAPEM
NXCT 345 kV
8.13.4.3 Vibration endurance test
The circuit -breaker shall be operated without primary current 3 000 times as described in IEC
60056. ECT accuracy at rated current shall be measured before and after the test. The ECT
error following the test must not differ from that recorded before the test by more than half the
limit of error appropriate to its accuracy class.
NOTE Vibration levels generated by circuit -breakers have been found to be principally dependant on the actuation
principle. A circuit-breaker having a spring mechanism will generally produce higher levels of vibration, thus an ECT
test on such a circuit-breaker may be considered valid for other circuit-breakers, subject to agreement between
manufacturer and purchaser.
Summary of Vibration Tests:
Test Result: Pass
CT serial #: D0XXXXR00.00-001
Rated Voltage: 345 kV Rated Current: 2000 A
Powertech report #: 14114-27-00, Date: 8/27/2003
Test date: 1/22/2003
The NXCT was subjected to horizontal and vertical acceleration. A summary of the Powertech
test report is given below.
Vibration conditions were as follows:
•
Sine sweep 5 to 500 Hz in horizontal and vertical directions
•
Sweep cycle is 1 octave/min.
•
Amplitude 0.707 gs peak
•
Test duration – one sweep (6 minutes 38 seconds)
Sensor output measurements were taken at 5, 10, 30, 50, 60, 70, 120 and the dominant
frequency for the orientation being tested. The maximum vertical resonance was at 436.8 Hz and
the maximum horizontal resonance was at 137.14 Hz.
Original Vibration Test Report:
© 2005 NxtPhase T&D Corporation
Page 38