GB/T 34929-2017 in English

VALID

Unit cascaded soft-start device

Issued on:2017-11-01
Implemented on:2018-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $220.00
$214.00

Standard No:	GB/T 34929-2017
Document status:	VALID
Title in English:	Unit cascaded soft-start device
Title in Chinese:	单元级联型软起动装置
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-11-01
Implemented on:	2018-05-01
ICS Classification:	29.200-Rectifiers. Convertors. Stabilized power supply
Professional Classification:	GB-National Standard
Related Keywords:	unit cascade soft starter soft-start device introduction unit cascade unit cascade structure other soft starter device standards
Related Topics:	cascade model Single stage multiple stage cascade model Cross-linking device GBT34929 GB/T 34929-2017

《GB/T 34929-2017单元级联型软起动装置》由TC60（全国电力电子系统和设备标准化技术委员会）归口，TC60SC5（全国电力电子系统和设备标准化技术委员会电机软起动分会）执行，主管部门为中国电器工业协会。

Introduction

1. Standard Overview

GB/T 34929-2017 "Unit Cascade Soft Starter" specifies the terms and definitions, system integration and model naming, technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of unit cascade soft starters. This standard applies to unit cascade soft starters for three-phase AC motors with a rated input AC voltage of 3kV to 10kV and a rated input frequency of 50Hz or 60Hz.

2. Comparison of standard frameworks

Standard dimensions	GB/T 34929—2017	Comparative analysis
Technical requirements	Cover output voltage range, harmonic requirements, protection functions, etc.	Compared with other soft starter device standards, detailed provisions for unit cascade structure are added.
Test methods	Include insulation resistance test, dielectric strength test, temperature rise test, etc.	The test requirements are more stringent, focusing on the performance verification of the device in a complex environment.
Protection functions	Including overvoltage protection, undervoltage protection, short circuit protection and more than 10 other functions.	The protection mechanism is more comprehensive and adapts to complex working conditions.

3. Background of standard formulation

With the rapid development of industrial automation and power electronics technology, soft starters play an increasingly important role in the field of motor control. The formulation of GB/T 34929-2017 is mainly based on the following background:

Driven by market demand: With the increasing application of high-performance motors, traditional starting methods can no longer meet the needs of complex working conditions.
Driven by technological evolution: Innovations in power semiconductors, PWM technology and topology provide better solutions for soft starters.
Necessity of standardization: Unify technical specifications to ensure product quality and safety performance.

4. Analysis of technological evolution

The technological evolution of unit cascade soft starter is mainly reflected in the following aspects:

Case analysis:The transition from traditional single-phase thyristor voltage regulator to modern multi-phase PWM inverter.

Early technology: Voltage regulation based on SCR (silicon controlled rectifier) has problems of harmonic pollution and slow response speed.
Mid-term technology: The use of three-phase PWM inverter significantly improves the power factor and dynamic response performance.
Modern technology: The introduction of unit cascade structure realizes multiple input current, further reduces the harmonic content and improves system reliability.

5. Implementation Recommendations

To ensure the effective implementation of GB/T 34929-2017, the following measures are recommended:

Selection phase: Select a device with the appropriate voltage level and number of power units according to the rated parameters and operating conditions of the motor.
Installation requirements: Install in strict accordance with the environmental conditions (such as temperature and humidity) in the standard, and ensure that grounding protection measures are in place.
Maintenance recommendations: Regularly check the wire connection, component status and insulation performance to ensure long-term and stable operation of the device.

More samples: DL/T 5154-2012 QC/T 942-2021 NB/T 47013.2-2015

Sample only — not a preview of GB/T 34929-2017