IEC 62505-3-3:2009 pdf free download

IEC 62505-3-3:2009 pdf free download Railway applications – Fixed installations – Particular requirements for a.c. switchgear – Part 3-3: Measurement, control and protection devices for specific use in a.c. traction systems – Single-phase inductive voltage transformers
1 Scope
This part of IEC 62505 gives particular requirements for voltage transformers used in a.c.single-phase railway applications, fixed installations.
This International Standard applies to inductive voltage transformers used at traction voltages and frequencies according to IEC 60850.
The main uses of these voltage transformers are:
− voltage indication;
− measurement;
− protection.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60044-2:1 997, Instrument transformers – Part 2: Inductive voltage transformers
IEC 60529:2001 , Degrees of protection provided by enclosures (IP Code)
IEC 60850, Railway applications – Supply voltages of traction systems
IEC 62236-5, Railway applications – Electromagnetic compatibility – Part 5: Emission and immunity of fixed power supply installations and apparatus
IEC 62497-1 , Railway applications – Insulation coordination – Part 1: Basic requirements – Clearances and creepage distances for all electrical and electronic equipment
IEC 62505 (all parts), Railway applications – Fixed installations – Particular requirements for a.c. switchgear
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62505-1 , Clause 3 and in IEC 60044-2:1 997, Clause 2, apply.
4 Service conditions
Where the equipment described in this part of the standard is mounted on circuit breakers to IEC 62505-1 , then the service conditions of that standard apply. Where they are separately mounted and are used in association with switchgear then the same service conditions as the switchgear apply.
5 Characteristics and use
The voltage transformer shall be: a) either mounted inside the circuit breaker specified in IEC 62505-1 ;
technical requirements of this IEC 62505-3-3 apply together with the construction and test requirements (as applicable) of IEC 62505-1 ;
b) or separately mounted, free standing; technical requirements of this IEC 62505-3-3 apply.
6 Rating and design requirements
Clauses 5 and 6 of IEC 60044-2:1 997 apply with the following exceptions:
− In subclause 5.1 .2 the following shall be added at the end of the subclause:
The secondary voltage values of 1 00 V or 1 1 0 V shall be preferred.
The rated ratio is given by the primary nominal voltage, as defined in IEC 60850, divided by the rated secondary voltage.
− In Clause 6 the entire subclause 6.1 .1 shall be replaced by:
6.1.1 Rated insulation levels for the primary winding
Voltage transformers covered by this standard shall have the same insulation ratings and test values as the equipment into which they are installed. See Table 1 of IEC 62505-1 and IEC 62505-2. Free standing voltage transformers shall meet the same requirements.
− Subclause 6.1 .5 of IEC 60044-2 is valid unless inconsistent with 9.1 of this International Standard.