IEC 60947-9-1 pdf free download
IEC 60947-9-1 pdf free download.Low-voltage switchgear and controlgear – Part 9-1: Active arc-fault mitigation systems – Arc quenching devices.
Parts of insulating materials necessary to retain current-carrying parts in position shall be compatible with the maximum permissible main circuit terminal temperature declared by the manufacturer (see item 17 of Table 1). Where, in 7.1.2.2 of IEC 60947-1:2007, lEG 60947-1:2007!AMD1:2010 and IEC 60947-1:2007/AMD2:2014, the test temperature is to be specified, the value required by this standard is 850 °C.
AQDs shall be provided with a local indicator showing the state (open or closed) of the device. This indicator shall be visible when installed and with the AQD compartment door open. This information shall also be available remotely, through an auxiliary contact or equivalent, to provide electrical interlocking with the upstream SCPD.
NOTE 1 This interlocking is to ensure that the circuit protected by the AQD cannot be re-energized until the device has been replaced, re-opened or reset.
NOTE 2 One or more additional auxiliary contacts can also be provided for optional interlocking with other devices, such as the external detection device.
Single shot AQDs able to be re-opened after operating shall be provided with an additional indicator showing, after re-opening, that the device is “open”, but not ready to operate anymore. This indicator shall be visible when installed and with the AQD compartment door open.
Resettable AQDs shall be provided with means to count the number of operations. A means to indicate that the maximum number of operations has been reached shall be provided in that case.
AQDs that have provisions for disabling the quenching function shall have provisions for local and remote indication that the device has been disabled.
If AQDs contain items that have stored charges after disconnection from the power supply (capacitors, etc.), means shall be provided either to prevent access to these items during normal service, or to discharge them before access is possible. This requirement does not apply if the stored charges voltage falls below 60 V DC in less than 5 s after disconnection from the power supply.
8.2 Performance requirements
Subclause 7.2 of IEC 60947-1:2007, IEC 60947-1:2007/AMDI:2010 and
IEC 60947-1 :2007/AMD2:2014 applies with the following modifications:
The maximum operating time shall comply with the value stated by the manufacturer.
It shall not be possible to reset a resettable AQD while the triggering signal is present.
As AQDs do not permanently carry current, the temperature-rise requirements of 7.2.2.4 of
IEC 60947-1:2007 for the main circuit do not apply.
Subclause 7.2.4 of IEC 60947-1:2007 does not apply, since an AQD is not intended to make,
carry or break currents under no-load, normal load or overload conditions.
Subclause 7.2.5 of IEC 60947-1:2007 applies only to the rated short-time withstand current.
9.3.1.2.5 Rated short-time withstand current test
Subclause 8.3.4.3 of IEC 60947-1:2007 applies with the following modifications:
The metallic screen of 8.3.2.1 of IEC 60947-1:2007 and IEC 60947-1:2007/AMD2:2014 shall be used.
With the AQD in the open state, the AQD shall be closed onto the test circuit by applying a triggering signal in accordance with the manufacturer’s instructions under the most severe conditions, considering, for example, minimum voltage, minimum current, maximum length of cable or optical fibre, and minimum signal duration. If the operation of the AQD depends on an auxiliary power supply, the supply voltage shall be set to 70 % of the minimum rated supply voltage of the AQD.
The voltage between poles shall be recorded throughout the test; the maximum voltage drop (see 5.5) and the operating time (see 5.6) shall comply with the values stated by the manufacturer.
The correct functioning of the local and remote indicators (see 8.1) shall be verified before and after the test.
During the test, there shall be neither arcing nor flashover between poles, or between poles and frame, and no melting of the fusible element F in the leakage detection circuit (see 8.3.4.1.7 of IEC 60947-1:2007). There shall be no ejected parts likely to cause a hazard to the operator.IEC 60947-9-1 pdf download.
