Vysokonapěťové spínací a řídicí zařízení

Komise : IEC/SC 17A (High-voltage switchgear and controlgear)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 19.05.2020
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Clause 1 of IEC 62271‑1:2017 does not apply, and is replaced as follows:

This part of IEC 62271 applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches composed of switches or switch-disconnectors and current-limiting fuses designed so as to be capable of

breaking, at the rated voltage, any current up to and including the rated short-circuit breaking current;

making, at the rated voltage, circuits to which the rated short-circuit breaking current applies.

It does not apply to combinations of fuses with circuit-breakers, contactors or circuit switchers, nor for combinations for motor-circuits nor to combinations incorporating single capacitor bank switches.

This standard applies to combinations designed with rated voltages above 1 kV up to and including 52 kV for use on three-phase alternating current systems of either 50 Hz or 60 Hz.

In this standard, the word “combination” is used for a combination in which the components constitute a functional assembly. Each association of a given type of switch and a given type of fuse defines one type of switch-fuse combination. Different types of fuses may be combined with one type of switch, which give several combinations with different characteristics, in particular concerning the rated continuous currents.

A switch-fuse combination is then defined by its type designation and a list of selected fuses defined by the manufacturer, the so-called “reference list of fuses”. Compliance with this standard of a given combination means that every combination using one of the selected fuses is proven to be in compliance with this standard.

The fuses are incorporated in order to extend the short-circuit breaking rating of the combination beyond that of the switch alone. They are fitted with strikers in order both to open automa­tically all three poles of the switch on the operation of a fuse and to achieve a correct operation at values of fault current above the minimum melting current but below the minimum breaking current of the fuses. In addition to the fuse strikers, the combination may be fitted with either an over-current release or a shunt release.

NOTE In this standard the term “fuse” is used to designate either the fuse or the fuse-link where the general meaning of the text does not result in ambiguity.

Fuses shall be in accordance with IEC 60282-1:2009/AMD1:2014.

Devices that require dependent manual operation are not covered by this standard.

Switches, including their specific mechanism, shall be in accordance with IEC 62271-103:20xx except for the short-time current and short-circuit making requirements where the current-limiting effects of the fuses are taken into account.

Earthing switches forming an integral part of a combination are covered by IEC 62271‑102.

Switches which include other functions (not covered by IEC 62271‑103) have to fulfil the requirements of their relevant standards additionally (e.g. IEC 62271‑102 Disconnectors and Earthing switches).

Komise : IEC/SC 17A (High-voltage switchgear and controlgear)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 19.05.2020
Zobraz více Zobraz méně
 

This part of IEC 62271 is applicable to AC circuit-breakers designed for indoor or outdoor installation and for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above 1 000 V to be tested with direct testing methods.

NOTE In a direct testing method one source is used to supply the voltage and current during the making and breaking tests.

This part of IEC 62271 is not applicable to:

circuit-breakers with a closing mechanism for dependent manual operation;

circuit-breakers intended for use on motive power units of electrical traction equipment; these are covered by IEC 60077 [1][1];

generator circuit-breakers installed between generator and step-up transformer; these are covered by the IEC 62271-37-013 [2];

self-tripping circuit-breakers with tripping devices that cannot be made inoperative during testing. Tests on automatic circuit reclosers are covered by IEC 62271-111 [3];

tests to prove the performance under abnormal conditions that are not described in this part are subject to agreement between manufacturer and user. Such abnormal conditions are, for example, cases where the voltage is higher than the rated voltage of the circuit-breaker, conditions which may occur due to sudden loss of load on long lines or cables.

 

[1]  Numbers in square brackets refer to the bibliography.