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Laboratories for Power Tests
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High power facilities allow the performance of tests on electrical equipment in order to check their capability to withstand electrodynamic and thermal stresses caused by high currents, and in case of circuit-breakers, to verify their capability to break such currents, that correspond to short circuit conditions which may occur in operation.
In the following the characteristics of the main test facilities are outlined.
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| Power supply |
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| Main technical features: Generator |
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| Maximum short circuit power |
three-phase tests 2000 MVA |
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| single-phase tests 1200 MVA |
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| Frequencies |
16 2/3 - 50 - 60 Hz |
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| MV equipment testing plant |
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| Test cell dimensions |
N.1 9x7x8 (h)m |
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| N.2 6x7x8 (h) m |
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| Maximum laboratory test parameters |
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| Test voltage (three-phase) |
38 kV |
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| Test voltage (single-phase) |
52 kV |
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| Test current |
130 kA |
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| Reactive power of the capacitor bank |
2x53 Mvar |
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HV equipment testing plant
In this plant the synthetic testing method is used which allows to reach high short circuit powers taking advantages of the correct combination of two different circuits, each one having a relatively low power.
This testing method offers the advantage of:
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making possible laboratory testing of circuit breakers which, given their high short circuit power, could not be tested but in the network;
undertaking a non-destructive testing method which allows the test of various technological solutions without the inconvenience of substituting components which would certainly be damaged by direct testing methods;
obtaining in most cases a better accuracy in the regulation of transient recovery voltage.
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| Main technical characteristics |
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| Current circuit |
Maximum voltage |
72 kV rms |
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Maximum test current |
120 kA rms |
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Frequency |
network supply 50 Hz
generator supply
16 2/3, 50 e 60 Hz |
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| Voltage circuit |
Total installed
capacitive energy |
3000 kJ |
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Max charging voltage |
550 kV DC |
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Max injected current |
32 kA (cresta) |
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Injection frequency |
da 250 a 1000 Hz |
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| Making circuit |
Max applied voltage |
315 kV rms |
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Max short-circuit current |
63 kA rms |
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| Test cell dimensions |
20x20x 17 (h) m
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