IEC +A+A(E). Edition consolidated with amendments and This English-language version is derived from the. This standard applies to all high-voltage switchgear and controlgear except as otherwise specified in the relevant IEC standards for the particular type of. Find the most up-to-date version of IEC at Engineering
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For outdoor installation without additional mechanical protection, higher impact levels may be specified, subject to an agreement between manufacturer and user. Identification of conductors shall be in agreement with the wiring diagrams and drawings, and the specification of the user, if applicable.
NOTE For convenience of testing, wider tolerances of the rated frequency may be necessary. It shall be in the closed position and fitted with clean contacts in new condition. Switches, disconnectors, switch-disconnectors and fuse-combination units IEC Particular requirements for temperature sensing controls IEC Each 6694 shall be considered as a part of auxiliary and control equipment see idc. Where an electromechanical contactor is combined with suitable relays, to 6694 short-circuit protection, it shall also satisfy the relevant conditions for LV circuit-breakers, as specified in IEC Where appropriate, identification of wiring according to IEC may be applied.
NOTE 1 Condensation can be expected where sudden temperature changes occur in periods of high humidity.
This filter also reduces circulating radio-frequency currents in the test circuit, generated by the high-voltage transformer or picked up from extraneous sources. Otherwise, the contacts shall be regarded as “bare”. Other characteristics such as type of gas or temperature class being specialized shall be represented by the symbols which are used in the relevant standards.
Use and handling of sulphur hexafluoride SF 6 in high-voltage switchgear and controlgear IEC all partsElectromechanical non-specified time all-or-nothing relays IEC NOTE 5 An auxiliary contact which complies with class 1, 2 or 3 for d. Sealed pressure systems are completely assembled and tested in the factory.
C Closed pressure system for gas For an operating device combined with a switching device, it may be sufficient to use only one combined nameplate. In this case, the test shall be performed by applying three consecutive impulses for each polarity.
For sulphur hexafluoride-filled switchgear and controlgear, new sulphur hexafluoride shall comply with IEC In order to avoid indication errors because of rapid temperature changes, the thermometers or thermocouples may be put into small bottles containing about 0,5 l of oil. Electromechanical contactors and motor-starters IEC This value is applicable to controlled pressure systems 3. Terminal blocks for wiring components inside the enclosure shall be chosen according to the cross-section of the conductors used.
Performance of relay contacts shall comply with the requirements of IEC Procedure C of IEC may be applied as an alternative to ic 15 impulses withstand test. As no IEC standard exists for shunt releases, they should satisfy the requirements of the relevant equipment standard. It shall be possible to easily 600694 the state of the position-indicating device when operating locally.
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When the arcing contacts are bare copper contacts and are separate from but in parallel with the main contacts, the temperature rise of the main contacts and of the arcing contacts shall not exceed the values given in table 3. NOTE 2 To withstand the effects of high humidity and condensation, such as breakdown of insulation or corrosion of metallic parts, switchgear designed for such conditions and tested accordingly should be used.
Reconditioning during individual type tests may be allowed, according to the relevant IEC standard. Test conditions 7, 8 and 9 may be omitted if the arrangement of iex terminals of each pole is symmetrical with respect to the base. For three-pole switchgear and controlgear, the test shall be made in a three-phase circuit with the exceptions mentioned above. On-line information iecc also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda.
Lever toggle switches shall comply with the requirements of IEC When, however, the characteristics of the test plant are such that the peak and r.
The recommended values are 0,5 irc, 2 s and 3 s. Point 11 The temperature shall not reach a value where the elasticity of the material is impaired. When tests are performed at 60 Hz, they should be considered valid for the same current rating with 50 Hz rated frequency.
For most of the rated voltages, several rated insulation levels exist to allow for application of different performance criteria or overvoltage patterns. Refer to instrument transformer standards for adequate performances of these devices. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. Care should be taken to avoid influencing the measurements by earthed or unearthed objects near to the switchgear and controlgear and to the test and measuring circuits.
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Identification of terminals shall comply with the requirements of IEC and shall be in agreement with the indications on the wiring diagrams and drawings, and the specification of the user, if applicable. A device indicating when the spring or weight is charged shall be mounted on the switching device except in the case of an independent manual closing operation.
The measured value of the d. Contact performance IEC The difference of temperature rise shall not exceed 5 K. Auxiliary and control contacts shall be suitable for the number of electrical and mechanical operating cycles specified for the switching device.
Point 1 According to its function, the same part may belong to several categories as listed in table 3. NOTE Attention is drawn to the need to comply with local regulation relevant to pressure vessels. Installation and mitigation guidelines IEC NOTE Several gas-filled compartments may be permanently interconnected to form a common gas-system gastight assembly. For switchgear and controlgear having a minimum functional pressure not higher than 0,2 MPa absolute pressuresuch means should be subject to agreement between manufacturer and user.