GB 16926-2009
High-voltage alternating current switch-fuse combinations (English Version)

Standard No.

GB 16926-2009

Language

Chinese, Available in English version

Release Date

2009

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB 16926-2009

Replace

GB 16926-1997

Scope

This standard is applicable to the load switch used in public and industrial power distribution systems, including the three-pole unit with the function combination of load disconnector and current-limiting fuse. And include any current of the rated short-circuit breaking current; - making capacity: make the circuit for which the rated short-circuit breaking current is applicable at the rated voltage. This standard does not apply to fuse-circuit-breaker, fuse-contactor combinations in motor circuits, or combinations containing a single capacitor bank load switch. In this standard, the use of "combination" means that each component in a combined electrical appliance constitutes a functional assembly. The combination of a given type of switch-disconnector and a given type of fuse determines a type of combination. In fact, different types of fuses can be combined with a load switch to obtain a series of combined electrical appliances with different characteristics, especially related to the rated current. Furthermore, for maintenance purposes, the user shall be aware of the types of fuses which may be combined with a switch-disconnector without affecting compliance with this standard, and shall be aware of the corresponding characteristics of such combination devices. The load switch-fuse combination is identified by its type and a series of alternative fuses determined by the manufacturer (the so-called "reference fuse list"). Compliance with this standard for a given combination means that every combination using any of the alternative fuses can be shown to comply with this standard. The purpose of installing fuses is to expand the short-circuit rating of the combined electrical appliance and make it exceed the short-circuit rating when the load switch is used alone. The striker is installed not only to automatically separate the three-phase load switch by relying on the action of the fuse, but also to operate correctly when the fault current is greater than the minimum melting current and the minimum breaking current of the small fuse. In addition to the striker of the fuse, the combined electrical appliance can also be equipped with an overcurrent release or a parallel release. This standard applies to combined electrical appliances installed indoors or outdoors in a three-phase AC system with a frequency of 50 Hz and a nominal voltage of 3 kV and above and 35 kV and below. The fuse shall comply with GB 15166.2. Load switches, including their specific operating mechanisms, should comply with GB 3804, except for short-time current and short-circuit making requirements, taking into account the current-limiting effect of fuses. The grounding switch that becomes an integral part of the combined electrical appliance shall comply with GB 1985.

GB 16926-2009 Referenced Document

• GB 1984-2003 High-voltage alternating-current circuit-breakers
• GB 1985-2004 High-voltage alternating-current disconnectors and earthing switches
• GB 3804-2004 High-voltage alternating-current switches for rated voltage above 3.6 kV and less than 40.5 kV
• GB/T 11022 Common specifications for high-voltage alternating-current switchgear and controlgear standards*， 2020-12-14 Update
• GB/T 15166.1 High-voltage alternating-current fuses—Part 1:Terminology*， 2019-06-04 Update
• GB/T 15166.2-2008 High-voltage alternating-current fuses.Part 2:Current-limiting fuses
• GB/T 15166.6-2008 High-voltage alternating-current fuses.Part 6:Application guide for the selection of fuse-links of high-voltage fuses for transformer circuit applications
• GB/T 2900.20 Electrotechnical terminology.High-voltage switchgear and controlgear*， 2016-02-24 Update

GB 16926-2009 history

• 2009 GB 16926-2009 High-voltage alternating current switch-fuse combinations
• 1997 GB 16926-1997 High-voltage alternating current switch-fuse combinations