HT Instruments PV-ISOTEST 1500V Solar Insulation Test and Ground Fault Locator

HT Instruments PV-ISOTEST 1500V Solar Insulation Test and Ground Fault Locator

Photovoltaic technology is changing.

The design and production of installations increasingly takes into consideration the increase in rated voltage, which allows for the realization of strings up to 30% longer, for a higher generated power and, at the same time, uses a smaller number of components, which allows for the reduction of energy loss (BoS) up to 30%, while improving profitability.

In this way, an increasing number of photovoltaic installations are realized with a rated voltage close to 1500VDC, with a view to obtaining the maximization of all the relevant benefits, while falling, at the regulatory level, in the classification of Low Voltage systems.

Consequently, the probability of a stress on each part of the photovoltaic system generates the need of having suitable and highly performing tools for an accurate and appropriate verification of these new parameters.

The first and only instrument suitable to carry out, on a photovoltaic system up to 1500VDC, the most important safety checks required by standard IEC/EN62446-1, and to guarantee the quality performance a professional nowadays considers as highly indispensable.

INSULATION IN DUAL MODE:

VERIFIES - Verification with an immediate result (OK | NO) of the insulation resistance of the active conductors of a module, string or entire photovoltaic field, according to the requirements of standard IEC/EN62446, with no need for an external switch to short-circuit the positive and negative terminals.

IDENTIFIES - Automatic identification, with one single test, of the conformity of the total insulation of a whole photovoltaic field, with respect to expectations. PV-ISOTEST is the only verification instrument capable of simultaneously indicating the insulation resistance values of both the positive and negative poles, thus giving the operator the possibility to direct his search to the real location of the fault.

INSULATION IN TIMER MODE:

VERIFIES - Verification with immediate result (OK | NO) of the insulation resistance of a cable with calculation of the Dielectric Absorption Ratio (DAR = R1min / R30s) and of the Polarization Index (PI = R10min/R1min), which indicate the state of deterioration of the insulation.

IDENTIFIES - Evaluation of the values of parameters DAR and PI, specifically useful in case the insulation of particularly long or old cables is to be tested.

GROUND FAULT LOCATOR MODE:

PV-ISOTEST provides the precise position of a possible single fault of low insulation found on a string of the PV system due, for example, to water or humidity infiltrations.

RPE MODE:

Verification with an immediate result (OK | NO) of the continuity of the protective conductors and of the relevant connections with test current >200mA

DMM MODE:

Immediate display of the DC and RMS voltages (also including possible AC components) between the poles and the earth.