IEC 60310-2016 pdf download
IEC 60310-2016 pdf download.Railway applications – Traction transformers and inductors on board rolling stock.
4 Classification
4.1 Classification of transformers
The transformers mentioned above may be:
— traction transformers to supply the propulsion circuits, and optionally also other equipment;
— auxiliary transformers to supply electrical equipment except propulsion circuits. Windings mentioned in the standard may be:
— line side windings which are directly connected to the power supply line;
— traction windings which supply the propulsion circuits:
— auxiliary windings which are used for other purposes
4.2 Classification of inductors
According to their use, inductors can be classified as follows:
— inductors for alternating current:
inductors that carry alternating current, such as transition inductors used for transition between tappings of tap changers, inductors for a.c. commutator motor braking circuits, interference suppression inductors, tuned filter inductors, etc.;
— inductors for direct current:
inductors that carry direct current with small or negligible a.c. components, such as d.c. line filter inductors, inductive shunts for traction motors, inductors for d.c. motor braking circuits, etc.;
— inductors for pulsating current:
inductors that carry direct or alternating current with a significant periodic ripple, such as smoothing inductors for traction motors, sinusoidal filter inductors in auxiliary converters, etc.
5 Service conditions
The normal service conditions for transformers and inductors shall be in accordance to IEC 62498-1. Special service conditions shall be agreed between the purchaser and manufacturer.
6.1 Load profile
A transformer/inductor is designed to operate on the train in steady-state and transient (surge) conditions, both in normal and overload conditions.
The purchaser should specify the load profile according to Annex E (informative). The current frequency spectrum shall be specified by the responsible party.
6.2 Rated current
The rated current of a winding is the current this winding can sustain permanently at the reference temperature for continuous load.
The rated current shall be calculated according to either of following methods:
a) r.m.s. current derived from the load profiles:
b) considering thermal ageing of insulating materials according to Annex B (informative).
Special attention should be paid to varying cooling modes and to the averaging time window.
The reference temperature for continuous load is the cooling medium temperature at the external interface of the transformer/inductor. It shall:
C) either be directly specified by the purchaser:
Specified values should be based on the air temperature external to vehicle as defined in
lEG 62498-1.
d) or calculated by the manufacturer based on the temperature histogram provided by the purchaser and the method of Annex B (informative): see cooling medium reference temperature for lifetime calculation in B.4.2.
For a traction winding, the rated current shall correspond to the principal tapping. This definition of rated current applies when other windings. which are normally on load, deliver their rated loads.
7 Rated voltage and power of transformer windings
7.1 Rated line-side voltage
The rated line-side voltage is the r.m.s. voltage applicable in normal operating conditions to the line-side winding group. If this winding has tappings, the rated voltage shall be referred to the principal tapping.
Unless otherwise agreed between purchaser and manufacturer, the rated line-side voltage is specified as being equal to the nominal voltage of the traction system.IEC 60310 pdf download.
