IEC 61958:2000 pdf free download – High-voltage prefabricated switchgear andcontrolgear assemblies
1.1Scope
This International Standard is applicable to voltage presence indicating systems (vPIS) incor-porated in a.c.switchgear and controlgear covered by IEC 60298 or lEC 60466.
Voltage presence indicating systems are devices used to provide information to operatorsabout the voltage condition of the main circuit of the switchgear in which they are installed.
The indication of VPlS alone is not sufficient to prove that the system is dead: if operatingprocedures make it mandatory，relevant voltage detectors according to lEC 61243 shall beused.
This standard is also applicable to phase comparators specifically designed for use with VPIS.
1.2 Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this International ‘Standard. For dated references，subsequentamendments to,or revisions of， any of these publications do not apply. However，parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the normative documents indicated below.For undatedreferences，the latest edition of the normative document referred to applies.Members of lECand lso maintain registers of currently valid lnternational Standards.
IEC 60050(601)，International Electrotechnical Vocabulary (IEVv) -Chapter 601: Generation.transmission and distribution of electricity – General
IEC 60060-1,High-voltage test techniques – Part 1:General definitions and test requirementsIEC 60068-2-14，Environmental testing – Part 2:Tests – Test N: Change of temperature
IEC 60068-2-75，Environmental testing – Part 2:Tests – Test Eh: Hammer tests
IEC 60298,A.C. metal-enclosed switchgear and controlgear for rated voltages above 1 kV andup to and including 52 kv
IEC 60466,A.C. insulation-enclosed switchgear and controlgear for rated voltages above 1 kVand up to and including 38 kv
IEC 60529，Degrees of protection provided by enclosures (IP code)
IEC 60694,Common specifications for high-voltage switchgear and controlgear standards
IEC 61243-1，Live working – Voltage detectors – Part 1: Capacitive type to be used forvoltages exceeding 1 kv a.c.
IEC 61243-2,Live working – Voltage detectors – Part 2: Resistive type to be used for voltagesof 1 kV to 36 kv a.c.
IEC 61243-5,Live working – Voltage detectors – Part 5: Voltage detecting systems (VDs)
3.1 voltage presence indicating system (vPIs)
device used to indicate the presence of operating voltageNOTE 1VPIS may also be used in conjunction with phase comparators.
NOTE 2 vPIS are not designed to detect reliably the absence of voltage: for this purpose, only voltage detectorsor voltage detecting systems (VDS according to lEC 61243-5) should be used.
3.2 coupling element
part of the VPIS connected to the main circuit which transmits to the indicating element asignal related to the voltage condition of this circuit. Different physical principles can be usedfor the coupling element, for example, capacitive, resistive, optical, etc.
3.3 indicating element
part of the VPIS which gives a visual indication depending on the input signal received from thecoupling element
5.3.2Frequency of repetition
ln the case of a repetitive visual indication, the frequency of repetition shall be at least 1 Hz.This requirement shall be met for an actual line-to-earth voltage equal to, or greater than,45 %of the nominal voltage.For a line-to-earth voltage lower than 10 % of the nominal voltage, theindication corresponding to “voltage not present” shall appear with no active signal allowed fora VPIS having no built-in power source.
For single-phase systems, the applicable threshold values according to 5.2 shall be used.