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Bender Renewable Energy

  • Text
  • Insulation
  • Monitoring
  • Photovoltaic
  • Electrical
  • Faults
  • Installation
  • Unearthed
  • Voltage
  • Availability
  • Residual

G High availability of

G High availability of unearthed photovoltaic systems Photovoltaic inverters with galvanic isolation For photovoltaic systems with galvanic separation in the inverter, an ISOMETER® of the middle price and performance category is the choice for monitoring the unearthed system (IT system) in compliance with DIN VDE 0100-410. Independently from any insulation measurement carried out by the inverter prior to connection, the entire photovoltaic array is permanently monitored by the ISOMETER® which satisfies the requirements of DIN VDE 0100-410 (IEC 60364-4-41). The IEC 61557-8 requires that also symmetrical insulation faults are to be detected. Symmetrical faults are caused by moisture and dirt, for example – particularly in the case of photovoltaic systems these faults are more common. The isoPV485 uses the Bender AMP measurement method and also detects reliably insulation faults with a maximum leakage capacitance of up to 500 µF. The recommended size of installation therefore is max. 500 kW. ISOMETER® isoPV ■■ ■■ Precisely measure the insulation resistance using the patented measurement method Are perfectly tailored to the requirements of photovoltaic systems (presetting for PV systems) Your advantages ■■ ■■ ■■ ■■ ■■ GUARANTEED ELECTRICAL SAFETY Insulation monitoring device for unearthed AC/DC IT systems in small and medium-sized photovoltaic systems: isoPV425 No operational interruption on the occurrence of the first insulation fault High level of efficiency of the photovoltaic system through the whole service life Unexpected maintenance measures are avoided Optimised deployment of personnel and planning of time resources Insulation fault location during operation PV-Array DC-IT-System 0...1000 V Inverter with transformer R f DC+ ISOMETER ® isoPV425 C e < 500 µF Alarm Typical design of an unearthed photovoltaic system in the range < 500 kVA 6

G Equipment for insulation fault location during operation The insulation monitoring of an unearthed installation (IT system) in compliance with the requirements of DIN VDE 0100-410 can be realised with an ISOMETER®. Insulation faults are recognised and signalled reliably. The subsequent localisation of an insulation fault, however, can be an extremely time-consuming and costly affair– in particular in photovoltaic systems that are physically very large. This problem can be remedied with insulation fault location systems (IEC 61557-9), Bender's EDS systems. Portable solutions With the portable insulation fault location system EDS3090 from Bender, insulation faults can be localised in a fast and uncomplicated way. For this purpose, a locating current injector (PGH) has to be connected to the photovoltaic system. It generates a specific pulsed locating current which is always limited to a maximum value. Using the mobile insulation fault locator EDS195P and a measuring clamp with the appropriate diameter, the location of the fault can be narrowed down to the string level. Using two measuring clamps makes it even possible to locate the damaged module. Localising insulation faults by means of the insulation fault location system not only is much easier and faster but can also be carried out during operation. The portable insulation fault location system EDS3096PV in a compact case which weighs just 7 kg is especially suitable for maintenance work of different photovoltaic systems (e.g. service providers for technical management). Also for individual large-scale systems, the EDS3096PV will pay for itself within a relatively short period. The graphic on page 8 illustrates how to combine portable and permanently installed equipment for insulation fault location. Portable equipment for insulation fault location EDS3090 PV-String R F I T PGH18x EDS195P PV inverter Your advantages ■■ ■■ ■■ GUARANTEED ELECTRICAL SAFETY Precise fault location within a relatively short period Significantly lower outlays in terms of personnel and time Modular system concept for optimal adaptation to the electrical installation Principle of manual insulation fault location in a photovoltaic string 7

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