IEC TR 63021:2016

Name: IEC TR 63021:2016 — Rotating electrical machinery - Natural graphite brush for slip-ring in wound rotor-type induction motor - Application information
SKU: IEC TR 63021:2016
Price: 35 EUR
Availability: InStock

Rotating electrical machinery - Natural graphite brush for slip-ring in wound rotor-type induction motor - Application information

Название (английский):

IEC TR 63021:2016

Rotating electrical machinery - Natural graphite brush for slip-ring in wound rotor-type induction motor - Application information

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 6 сентября 2016 г.
Издание:: IEC TR 63021 edition 1 version 1
ICS:: 29.160.01

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Язык документа:

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Срок поставки:1 рабочий день

Цена:35 €

Описание (английский):

IEC TR 63021:2016(E) presents technical characteristics, application results and practical information on NG-brush for slip-ring obtained through the application of NG-brush in various kinds of wound rotor-type induction motor (large-size water pump, belt conveyer, lift, winder motor, grinding mill and crusher in coal or ore mine; crane, rolling mill, compressor and winder motor for boring in oil or gas facility).

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты IEC

Overview - IEC TR 63021:2016 (Natural graphite brush for slip-ring)

IEC TR 63021:2016 is a technical report from the IEC on the use of natural graphite (NG) brushes for slip-rings in wound rotor-type induction motors. The report compiles technical characteristics, practical test results and application guidance obtained from field use of NG-brushes across heavy-duty installations (e.g., large water pumps, belt conveyors, lifts, winders, grinding mills, crushers, cranes, rolling mills, compressors and oil/gas boring motors). It compares NG‑brush performance with traditional copper brushes and summarizes operational benefits and constraints.

Key topics and technical requirements

Performance characteristics

Current density: NG‑brushes deliver comparable current density to copper brushes (typical NG range cited).
Electrical resistivity and bulk density: NG-brush resistivity is higher (documented ranges: NG 5–15 µΩm vs copper 0.05–3 µΩm) and NG bulk density is lower (NG ≈ 1.35 g/cm3 vs copper 4.5–5.5 g/cm3), affecting heat and wear behavior.

Operational issues addressed

Fire-spark: reduced sparking between NG-brush and slip-ring versus metal brushes, lowering ring damage and ignition risk.
Wear and life: brush wear, expected life of brush and slip-ring, and influence on maintenance intervals.
Dust diffusion: lower particulate generation from NG wear, reducing contamination risk and insulation degradation.
Noise and vibration: NG-brush porosity and friction characteristics contribute to vibration-absorbing ability and can reduce acoustic noise.
Temperature and brush pressure: guidance on managing brush temperature and contact forces for stable operation.

Testing and data

References test methods such as IEC 60413 and IEC 60773; includes application data in Annex A for real installations.

Practical applications and users

Where to apply: Slip-rings of wound rotor induction machines in mining, material handling, lifting, pumping, rolling and oil/gas drilling equipment - especially where sparking, dust or maintenance downtime are critical concerns.

Who benefits:

Electrical designers and rotating machinery engineers assessing brush material selection.
Maintenance and reliability teams aiming to reduce unplanned outages and slip‑ring damage.
Plant managers in heavy industries seeking improved safety (reduced fire-spark) and lower environmental contamination.

Economic considerations: NG-brushes may offer reduced lifecycle costs through longer slip-ring life, lower wear debris and fewer fire-related incidents despite differences in initial unit price.

Related standards

IEC 60413 - Test procedures for brush material physical properties

IEC 60773 - Test methods and apparatus for operational characteristics of brushes

IEC TR 63021:2016 is a practical reference for engineers choosing brush materials and defining inspection, testing and maintenance strategies for slip-ring systems.

IEC TR 63021:2016

Abstract

Похожие стандарты

Overview - IEC TR 63021:2016 (Natural graphite brush for slip-ring)

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

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