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NB/T 31004-2011

Chinese Standard: 'NB/T 31004-2011'
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Standard ID NB/T 31004-2011 (NB/T31004-2011)
Description (Translated English) Guidelines for vibration condition monitoring and diagnose of wind turbine generator
Sector / Industry Energy Industry Standard (Recommended)
Classification of Chinese Standard F11
Classification of International Standard 27.180
Word Count Estimation 16,122
Date of Issue 2011-08-06
Date of Implementation 2011-11-01
Quoted Standard GB/T 19873.1-2005; GB/T 19873.2-2009; IEC 61850-2002
Drafting Organization Power Technology Development Co., Ltd. in the can
Administrative Organization Wind energy industry Standardization Technical Committee
Regulation (derived from) ?National Energy Board Announcement 2011 No.5
Summary This standard specifies the wind turbine vibration monitoring system types, sensor installation guidelines, vibration assessment and signal processing and analysis methods, vibration condition monitoring system technical conditions, measurement type and value. This standard applies to single 1. 5MW capacity greater than or equal to the horizontal axis wind turbine. Other wind turbine according to its own characteristics with reference to use.

NB/T 31004-2011
ICS 27.180
F 11
Record Number. 33240-2011
Guidelines for vibration condition monitoring and
diagnose of wind turbine generator
Issued by. National Energy Administration
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Vibration condition monitoring system ... 7 
5 Sensor ... 8 
6 Technical conditions for vibration condition monitoring system ... 9 
7 Measurement and evaluation ... 13 
Appendix A ... 15 
Appendix B ... 18 
Appendix C ... 20 
This Standard was proposed by National Energy Administration.
This Standard shall be under the jurisdiction of Wind Power Standardization Technical
Drafting organizations of this Standard. Zhong Neng Power-tech Development Co., Ltd.
Main drafters of this Standard. Shen Zhu, Zhou Jicheng, Zhang Baoquan, Sheng
Yingxin, Xia Hui, Yue Junhong and Meng Kaifeng.
During implementation of this Standard, any comments or suggestions shall be feed-
backed to China Electricity Council Standardized Management Center (No.1, 2nd lane,
Baiguang Road, Beijing, 100761).
Vibration condition monitoring of wind turbine generator (hereinafter referred to as
“wind turbine”) refers to monitoring the variation of wind turbine’s vibration condition,
assessing the condition of wind turbine, detecting and tracking equipment failure in
early stage by selecting different monitoring position according to the type of wind
turbine that shall be monitored.
This Standard is used to provide corresponding provisions and guidance for
manufacturer, installer, user, certification organization as well as relative technical staff
of wind turbine’s vibration condition monitoring.
Guidelines for vibration condition monitoring and
diagnose of wind turbine generator
1    Scope   
This Standard specifies the system type of wind turbine’s vibration condition monitoring,
sensor installation principle, measurement type and measured value, technical
conditions of vibration condition monitoring system, evaluation of vibration value as
well as signal treatment and analysis method.
This Standard is applicable to the horizontal axis wind turbine of which the unit capacity
is greater than or equals to 1.5 MW. Other wind turbines may reference to this Standard
according to their own features.
2    Normative references 
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 19873.1-2005 Condition monitoring and diagnostics of machines - Vibration
condition monitoring - Part 1. General procedures
GB/T 19873.2-2009 Condition monitoring and diagnostics of machines - Vibration
condition monitoring - Part 2. Processing analysis and presentation of vibration data
IEC 61850-2002 Communication networks and systems in substations
3    Terms and definitions 
The following terms and definitions apply to this Standard.
3.1 Breakdown maintenance
Maintenance after wind turbine failure.
3.2 Condition-based maintenance
Maintenance determined according to wind turbine condition.
3.3 Condition monitoring
Detected and gathered information and data that reflect wind turbine condition.
3.4 Diagnostics
Symptom and syndrome inspections for determination of nature (type, condition,
degree) of the fault or failure.
3.5 Failure
The ability of failing to perform certain specified function.
3.6 Fault
The condition of parts when a part or a module of wind turbine degrades, or anomalous
condition occurs, which may cause wind turbine failure.
3.7 Alarm
The operating signal or message designed for informing staff when selected parameter
or its logical combination is abnormal.
3.8 Alert
The operating signal or message designed for informing staff when selected parameter
or its logical combination is abnormal and requires more attention.
3.9 Sign
Characteristic parameters of signal that indicate the condition of relative information.
3.10 Vibration signal
Measurement of all frequency components that are contained in a system vibration.
3.11 Frequency domain
Physical quantity that takes frequency as measurement.
3.12 Time domain
Physical quantity that takes time as measurement.
3.13 Cross-channel analysis
Using two or more analyzers of input channel to realize functions such as phase,
relevance and transfer function calculation.
3.14 Baseline
Single or a group of descriptors that provides baseline for wind turbine’s normal
condition in various processes.
3.15 Waterfall
Three-dimensional multi-spectral display of relative time or speed.
4    Vibration condition monitoring system 
4.1 Types of vibration condition monitoring system
Vibration condition monitoring system is divided into fixed installation system, semi-
fixed installation system and portable system.
4.1.1 Fixed installation system
System sensor and data collection device adopt fixed installation. Data collection shall
be continuous or periodic. Fixed installation system usually is used for wind turbine
with complex monitoring tasks.
4.1.2 Semi-fixed installation system
System sensor adopts fixed installation. Data collection device adopts non-fixed
installation; connect only during data collection. Data collection is periodic.
4.1.3 Portable system
System sensor and data collection device all adopt non-fixed installation. Data shall be
collected by portable data collector. Data collection is periodic.
4.1.4 System selection principle
a) Offshore wind turbine shall adopt fixed installation system;
b) Onshore wind turbine of over 2 MW (including 2 MW) shall adopt fixed installation
c) Onshore wind turbine of under 2 MW can choose semi-fixed installation or
portable system;
d) When the warranty expires, during the acceptance of wind turbine, it shall present
the vibration condition report that is provided by wind turbine vibration condition
monitoring system.
4.2 Procedure of condition monitoring
The procedure of wind turbine vibration condition monitoring includes pre-test of
vibration, vibration monitoring technology, vibration baseline test, vibration routine test,
3) Harmonic content. not less than 5%.
f) Voltage caused by ground potential rise that monitoring system shall be able to
withstand. not less than 2000 V.
6.2 Extreme ambient temperature for storage and transport
Permissible extreme ambient temperature for device’s storage and transport is -45°C
~ +85°C.
6.3 Detection unit
6.3.1 Overview
Detection unit is in wind turbine’s cabin to realize the measured parameter’s collection,
signal conditioning, modulus conversion and data pre-processing.
6.3.2 Uncertainty
The uncertainty of sensor measurement shall be within ±1%. The uncertainty of
detection unit shall be within ±2%.
6.3.3 Frequency range
Sensor’s linear frequency range shall cover from 0.2 times the minimum rotation
frequency to 3.5 times concerned highest signal frequency (usually it shall not exceed
40 kHz).
a) Frequency range of accelerometer sensor. 0.1Hz ~ 30kHz;
b) Frequency range of speed sensor. 1Hz ~ 2kHz;
c) Frequency range of displacement sensor. 0Hz ~ 10kHz.
6.3.4 Insulating properties
Under normal test atmospheric conditions (ambient temperature. +15°C ~ +35°C;
relative humidity. 30%~60%; atmospheric pressure. 86kPa~106kPa), detect unit’s
energized parts such as BETWEEN power, signal and data input loop-circuit AND non-
conductive metal and shell, BETWEEN unconnected electrical circuits; the insulation
shall meet requirements in ~ Insulation resistance
Under normal test atmosph......
Related standard:   NB/T 31003-2011  NB/T 31005-2011
Related PDF sample:   NB/T 31006-2011  GB/T 25385-2019
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