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IEC 62109-2-2011 pdf free download

IEC 62109-2-2011 pdf free download.Safety of power converters for use in photovoltaic power systems – Part 2: Particular requirements for inverters.
4 General testing requirements
This clause of Part 1 is applicable except as follows:
NOTE In IEC 62109-1 and therefore in this Part 2, test requirements that relate only to a single type of hazard (shock, tire, etc.) are located in the clause specific to that hazard type. Test requirements that relate to more than one type of hazard (for example testing under fault conditions) or that provide general test conditions, are located in this Clause 4.
4.4 Testing in single fault condition
4.4.4 SIngle fault conditions to be applied
Additional subciauses:
4.4.4.15 Fault-tolerance of protection for grid-Interactive Inverters
4.4.4.15.1 Fault-tolerance of residual current monitoring
Where protection against hazardous residual currents according to 4.8.3.5 is required. the residual current monitoring system must be able to operate properly with a single fault applied, or must detect the fault or loss of operability and cause the inverter to indicate a fault in accordance with 13.9, and disconnect from, or not connect to, the mains, no later than the next attempted re-start.
NOTE For a PV inverter, the next attempted re-start will occur no later than the morning following the fault occurring Operation during that penod of less than one day is allowed because it is considered highly unlikely that a fault in the monitoring system would happen on the same day as a person coming into contact with normally enclosed hazardous live parts of the PV system. or on the same day as a fire-hazardous ground fault.
Compliance is checked by testing with the grid-interactive inverter connected as in reference test conditions in Part 1. Single faults are to be applied in the inverter one at a time, for example in the residual current monitoring circuit, other control circuits, or in the power supply to such circuits.
For each fault condition, the inverter complies if one of the following occurs:
a) the inverter ceases to operate, indicates a fault in accordance with 13.9, disconnects from the mains, and does not re-connect after any sequence of removing and reconnecting PV power, AC power, or both,or
b) the inverter continues to operate, passes testing in accordance with 4.8.3.5 showing that the residual current monitoring system functions properly under the single fault condition, and indicates a fault in accordance with 13.9,or
c) the inverter continues to operate, regardless of loss of residual current monitoring functionality, but does not re-connect after any sequence of removing and reconnecting PV power, AC power, or both, and indicates a fault in accordance with 13.9.
4.4.4.15.2 Fault-tolerance of automatic disconnecting means
4.4.4.15.2.1 General
The means provided for automatic disconnection of a grid-interactive inverter from the mains shall:
— disconnect all grounded and ungrounded current-carrying conductors from the mains, and
— be such that with a single fault applied to the disconnection means or to any other location in the inverter, at least basic insulation or simple separation is maintained between the PV array and the mains when the disconnecting means is intended to be in the open state.
4.44.152.2 Design of insulation or separation
The design of the basic insulation or simple separation referred to in 4.4.415.2.1 shall comply with the following:
— the basic insulation or simple separation shall be based on the PV circuit working voltage, impulse withstand voltage, and temporary over-voltage, in accordance with 7.3.7 of Part 1;
— the mains shall be assumed to be disconnected;
— the provisions of 7.3.7.1.2 g) of Part 1 may be applied if the design incorporates means to reduce impulse voltages, and where required by 7.3.7.1.2 of Part 1, monitoring of such means:
— in determining the clearance based on working voltage in 7.3.7 of Part 1. the values of column 3 of Table 13 of Part 1 shall be used.IEC 62109-2 pdf download.

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