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GCC electrical test laboratories HV & HP laboratory

Ebbo de Meulemeester 25 May 2011


Contents • The need for testing in the GCC countries • Technical outline High Voltage Laboratory • Technical outline High Power Laboratory • Dependency between laboratory sections

25 May 2011

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HV & HP Laboratory The need for testing in the GCC countries


Background • Questionnaire results • Technical discussions with the Committee • Terms of Reference – Requirements for the laboratories • Equipments, tests, test ratings, standards, …

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Equipments to be tested • Switchgears, including – Circuit breakers – Switches – Pre-fabricated MV/LV switchgears

• Cables • Distribution transformers • Power Transformers

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Tests to be performed All main tests for electrical T&D equipments • Dielectric

• • • • • •

– AC, LI, SI, PD, … – dry & wet

Temperature rise Mechanical endurance Short-time withstand current (STC) Making and breaking Switching Other tests – environmental, …

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Required tests High Power Lab • Short time withstand tests • Making and Breaking tests

High Voltage Lab • Dielectric tests

General Test Lab • Temperature rise tests • Mechanical endurance tests • Other 25 May 2011

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Evaluation of voltage rating • Comparable usage manufacturers and users

• Usage: – ≤145 kV  75% – ≤245 kV  80-100% – 420kV  100%

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Evaluation of voltage rating Different estimations : • Usage users – ≤36 kV  40% – ≤145 kV  75% – 420kV  100%

• Usage manufacturers – ≤36 kV  95% – ≤245 kV  98% – 420kV  100%

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Terms of Reference - Switchgears Rated voltage

[kV]

Frequency

[Hz]

Rated current

[A]

SC current

[kA]

50

Rated voltage

[kV]

72.5 - 245

Frequency

[Hz]

50

Rated current

[A]

SC current

[kA]

12 - 24 50

60

60 6300

50

60

40

50

60 6300

31.5

31.5

≤420 50

6300 50

40.5

50

6300

60 6300

50

3-phase

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63

1-phase

10

31.5


Terms of Reference - Cables Rated voltage

[kV]

Frequency

[Hz]

Rated current

[A]

2500

SC current

[kA]

63

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12 - 420 50

60

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Terms of Reference - Transformers Rated voltage

[kV]

Frequency

[Hz]

Rated power

60 10

4 - 20%

Rated voltage

[kV]

Frequency

[Hz]

SC impedance

50

[MVA]

SC impedance

Rated power

12 - 36

[MVA]

72.5 50

145 60

50

60

50

70

>10%

>12.5%

STC & routine tests

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High Voltage Laboratory Technical outline


HV Laboratory • Types of tests • Design considerations • Test capabilities – HV test cell – MV test area

• Lay-out

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Dielectric & general tests • Dielectric – AC, LI, SI, PD, … – dry & wet

• Temperature rise / cycles • Mechanical endurance • Other – pollution, loss angle, …

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Design considerations • International standards (IEC, …) • Suitable for main equipments • Type tests • Routine tests for power transformers (after STC) • Tests at 50 & 60Hz (where applicable)

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Design considerations Four test areas: 1. HV test cell – dedicated to dielectric tests for HV equipments – Including pollution cell

2. MV test area (52kV) – test area with flexible test locations for MV applications – also capable for HV cable testing (<145kV) for flexibility

3. Mechanical endurance test cell – separate acoustic damping cell – thermal insulated for tests at elevated ambient temperature

4. Pre-qualification test field (cables) – Outside tests area 25 May 2011

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HV lab â&#x20AC;&#x201C; lay-out

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HV test cell - Main test capabilities • Lightning impulse generator – Lightning impulse – Switching impulse – Chopping gap

: :

(2400kV / 120kJ) 1725 kV 1175 kV

• AC transformer -1-

(750kV / 1500kVA)

• AC transformer -2-

(400kV / 400kVA)

– Applied voltage tests – Cables / Switchgears / Power transformers

– phase opposition tests – pollution cell

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HV test cell - Main test capabilities • Transformer test platform

(145kV / 70MVA)

• DC test set

(700kV / 0.1A)

• Pollution cell

(400kV / 1A)

– Induced voltage – Transformer losses / impedance – Temperature rise tests (limited)

– Add-on to AC transformer -2-

– Insulators, switches – Dimensions 8 x 6 x 8 m

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MV test area - Main test capabilities • Lightning impulse generator – Lightning impulse

:

(800kV / 40kJ) 650

kV

• AC transformer -1-

(300kV / 450kVA)

• AC transformer -2-

(200kV / 200kVA)

– Applied voltage tests – Cables, …

– applied voltage tests – Switchgears, …

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MV test area - Main test capabilities • Temperature rise tests – Current – Power – Frequency

(3-phase) : : :

• Transformer test platform – – – – –

7000 A 105 kVA / phase 50-60 Hz

(36kV / 10MVA)

Induced voltage Applied voltage Transformer losses / impedance Temperature rise tests Variable frequency power source for other temperature rise tests

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Transformer test platform

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Mobile test facilities • Transformer test platform (power transformers) – (HV test cell, without reactive power compensation – Induced voltage test – Impedances / losses – limited

• Mobile resonant cable test set – Future extension – Combination with HV lab usage – Regulating reactors

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Phasing 1. MV test area –

Includes general tests: •

mechanical, temperature rise, …

1. HV test cell –

Typetesting also require general tests

1. Pre-qualification test field

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High Power Laboratory Technical outline


Contents • High power tests • SC power source • Laboratory principle – Directe testen – Synth testen – Transf. testen

• Test capabilities • Lay-out 25 May 2011

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High power tests • SC making & breaking tests – Terminal fault – Short line fault – Out of Phase

• Switching tests – Capacitive charging currents – Inductive currents – Mainly active load (LBS)

• STC tests (short-time withstand current tests) – Switchgears – Transformers

• Internal arcing tests 25 May 2011

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HP laboratory SC power source


Grid fed laboratory

• Grid fed lab not feasible: – Shortage of SC power • Voltage dip (5 / 10%)

– Inflexible test frequency – Operational constraints

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Rated voltage [kV]

STC [kA]

12 12 12 12 17.5 17.5 17.5 17.5 24 24 24 24 36 36 36

50 40 31.5 25 50 40 31.5 25 50 40 31.5 25 40 31.5 25

30

SC test power [MVA] 50 Hz

60 Hz

1039

1039

831

831

655

655

520

520

1516

1516

1212

1212

955

955

758

758

2078

2078

1663

1663

1309

1309

1039

1039

2494

2494

1964

1964

1559

1559


SC generator fed laboratory

• SCG fed lab feasible: – 2 SC generators – Sufficient power – Flexible power frequency (50 & 60 Hz) – Flexible operation

– Power limited to MV applications 25 May 2011

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Rated voltage [kV]

STC [kA]

12 12 12 12 17.5 17.5 17.5 17.5 24 24 24 24 36 36 36

50 40 31.5 25 50 40 31.5 25 50 40 31.5 25 40 31.5 25

31

SC test power [MVA] 50 Hz

60 Hz

1039

1039

831

831

655

655

520

520

1516

1516

1212

1212

955

955

758

758

2078

2078

1663

1663

1309

1309

1039

1039

2494

2494

1964

1964

1559

1559


Synthetic testing Lv

G

L s

aux

Ig Ug

R UTR V

TO

C

G

Ii +

-

Ch

• Synthetic installation:

– Required for testing HV equipments

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3-Phase synthetic tests Rated STC SC test power voltage [kA] [MVA] [kV] 50 Hz 60 Hz 72.5 63 3024 3024 72.5 50 2400 2400 145 63 3024 3024 145 50 2400 2400 245 63 3024 3024 245 50 2400 2400 1-Phase synthetic tests Rated STC SC test power voltage [kA] [MVA] [kV] 50 Hz 60 Hz 245 63 1008 1008 245 50 800 800 300 63 1512 1512 300 50 1200 1200 420 63 1733 1733 420 50 1375 1375

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Resume • Power supply provided by SC generators is

required to meet the requests as indicated in the questionnaires

• Synthetic installation required to test HV switchgears

• Testing 400kV / 63kA at 60Hz may require an additional (3rd) SC generator

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Phasing 1 2

3

1. 1st SC generator 2. 2nd SC generator

 17.5kV / 31.5 kA  40.5kV / 40 / 31.5 kA power transformers 3. Synthetic installations  420 kV / 63 kA

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HP laboratory Laboratory principle


Design • Main equipments

– 2 SC generators – synchronisation – 6 single phase MV SC – – – –

transformers LV SC transformer Synthetic installation Current limiters, switches, … Loads, TRV control

• Test areas – – – –

MV/LV test bay MV/HV test bay Internal arcing test bay Power transformer test area

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Direct tests • Parallel or independent operating SC generators

• Limited power at 1 SC generator operation

• MV testing

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Synthetic tests • Combination direct circuit and synthetic installations

• Parallel operation of SC generators

• Highest power ratings

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LV tests • Single SC generator operation

• Dedicated LV SC transformer

• SRC and LV breaking tests

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Internal arcing tests • Single or parallel SC generator operation

• Dedicated test bay (pollution, waste, …)

• SRC and LV breaking tests

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Transformer tests • Series connection SC transformers (72-145kV) • Optimum power • impedance matching • Zs = Ztr • 25% of installed power Power transfer from source to transformer under test 30%

Power transfer ratio (%)

25%

20%

15% 10%

5%

0% 0,2

1

1,8

2,6

3,4

4,2

Ratio Str/Ss

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Proposed lay-out HP lab


Lay-out

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Maximum output power HPL Output power HPL at 50 Hz 120

Current (kA)

100 80 60 40 20 0 0

10

20

30

40

50

60

70

Voltage (kV) standard SCTR tapping Additional tap of -28%

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Maximum output power HPL Output power HPL at 60 Hz

100

Current (kA)

80

60

40

20

0 0

10

20

30

40

50

60

70

80

Voltage (kV) standard SCTR tapping Additional tap of -28%

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HV & HP Laboratory Technical dependency HVL and HPL


Phasing â&#x20AC;˘ Refer phasing of

separate laboratories

â&#x20AC;˘ Optimal utilisation of 2nd SC generator requires HV test cell for routine testing of power transformers

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GCC electrical test laboratories Concluding remark


Concluding remark â&#x20AC;˘ The preliminary design results in test capabilities for both the HV and HP laboratory which comply with the testing needs in the GCC countries

â&#x20AC;˘ Based on the design of the laboratories a technical phasing is identified

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End sheet Questions?


GCC Lab