VOLTWERK VC 200 Instrucciones De Servicio página 137

AC circuit breaker
LV HRC disconnector
Transformerless central inverter
AC-side fuses
There is no fuse integrated in the central inverter. Therefore, fuses (LV HRC
disconnector) or an AC circuit breaker must be connected between each
central inverter and the medium voltage transformer. The fusing must be
according to the rated current specified on the type plate. The AC cables
are to be dimensioned accordingly.
An AC circuit breaker with isolating properties or a fuse switch with a
fusible cut-out of gG standard must be connected upstream of each
central inverter. Please note:
AC circuit breaker must be adjusted to the rated current of the device.
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If the AC circuit breaker meets the requirements of an AC disconnector,
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check if a further AC disconnector is required.
If the AC circuit breaker meets the requirements for fusing the device,
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do not insert a fuse on the AC side.
When selecting the fuse (LV HRC disconnector) note:
Local directives and regulations.
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The ambient temperature influences the trigger behaviour of the fuse.
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If the rated current on the type plate differs from the rated current for
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the fuse inserts, use a fuse insert with the next highest rated current.
If the LV HRC disconnector meets the requirements of an AC
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disconnector, check if a further AC disconnector is required.
If the LV HRC disconnector meets the requirements for fusing the
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device, do not insert an AC circuit breaker.
If you have any questions regarding the dimensioning of the fuses,
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please contact the fuse manufacturer. Please note:
There are fuses which cannot support the rated current
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continuously.
Level of performance 200 kVA: Maximum 450 A, use type gG.
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Level of performance 300 kVA: Maximum 630 A, use type gG.
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Level of performance 350 kVA: Maximum 722 A, use type gTR or
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gG.
Insulation and earth fault monitoring of the IT grid
The reliability of the IT grid must be guaranteed with insulation and earth
fault monitoring. Monitoring detects an insulation fault or a short to earth
even as it is developing and reports it before a second fault interrupts
operation. Please note:
Only use insulation and earth fault monitoring with unearthed solar
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generators.
Insulation and earth fault monitoring must comply with the local
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regulations and the accident prevention regulations.
Insulation and earth fault monitoring must be suitable for operation in
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mixed networks (AC and DC). Otherwise, incorrect triggering or
incorrect measurements can occur due to the operating behaviour of
the inverter.
Measurement range from approx. 2 kΩ.
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Trigger value 4 kΩ (manufacturer's recommendation). Otherwise,
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device-internal leakage resistances and leakage currents in the solar
generator can result in incorrect triggering.
Operating manual
4 Installation location
47