GB/T 999-2021 (English Version) PDF

Scope: This document specifies the basic voltages and test methods used in DC electric traction systems. This document applies to the supply line voltage of DC electric traction systems under normal operating conditions. This document is mainly applied to the following electrified transportation: a) electrified transportation of industrial and mining enterprises (including underground roadway transportation); b) urban rail transit, such as subway electric vehicles, light rail trains, trams, low-speed maglev trains, etc.; c) urban trolleybus , Dual-energy trams; d) Suburban (including satellite towns) and electrified railways of local railways. This document does not apply to: a) rated voltages for expressing or transmitting signals (measured values); b) rated voltages for components or equipment units in electrical equipment; c) rated voltages for cranes, mobile platforms, funiculars. Note 1: The DC voltages involved in this document are average values. Note 2: The DC voltage in this document is the ripple-free DC voltage value, and the DC whose sinusoidal ripple content does not exceed 10% of the root-mean-square value is usually called "ripple-free DC".

GB/T 999-2021 Referenced Document

GB/T 156 Standard voltages
IEC 61133:2016 Railway applications - Rolling stock - Testing of rolling stock on completion of construction and before entry into service