This standard specifies terms and definitions as well as technical and test requirements of low-voltage reactive power compensation assemblies.
This standard is applicable to low-voltage reactive power compensation assemblies (hereinafter referred to as assemblies) with alternating voltage not exceeding 1000V (or 1140V) and frequency not exceeding 1000Hz.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties who enter into agreement according to this standard are encouraged to research whether the latest editions of these documents apply. For undated references, the latest edition of the normative document referred to applies.
GB/T 4025 Basic and Safety Principles for Man-machine Interface, Marking and Identification--Coding Principles for Indication Devices and Actuators (GB/T 4025-2003, IEC 60073: 1996, IDT)
GB 4208 Degrees of Protection Provided by Enclosure (IP Code) (GB 4208-2008, IEC 60529: 2001, IDT)
GB 7251.1 2005 Low-voltage Switchgear and Controlgear Assemblies-Part 1: Type-tested and Partially Type-tested Assemblies (IEC 60439-1: 1999, IDT)
GB 7947 Identification of Conductors by Colous or Numerals (GB/T 7947-1997, idt IEC 60446: 1989)
GB 10229 Reactors (GB/T 10229-1988, eqv IEC 60289: 1987)
GB/T 10233-2005 "Basic Testing Method for Low-voltage Switchgear and Controlgear Assemblies"
GB 12747.1 Shunt Power Capacitors of the Self-healing Type for A.C. Systems Having a Rated Voltage up to and including 1000V-Part 1: General-Performance, Testing and Rating-Safety Requirements-Guide for Installation and Operation (GB/T 12747.1-2004, IEC 60831-1: 1906, IDT)
GB/T 14549-1993 Quality of Electric Energy Supply-Harmonics in Public Supply Network
GB/T 20641 Empty Enclosures for Low-voltage Switchgear and Controlgear Assemblies - General Requirements (GB/T 20641-2006, IEC 62208: 2002, IDT)
JB/T 2436.1 Copper Crimped Terminal - Part 1: 0.5-6.0mm2 Wire Used Copper Crimped Terminal
JB/T 2436.2 Copper Crimped Terminal - Part 2: 10-300mm2 Wire Used Copper Crimped Terminal
JB/T 3085 Code for Package and Transport of Electric-drive Controlgear
JB/T 9663 Low Voltage Reactive Power Automatic Compensation Controller
3 Terms and Definitions
For the purposes of this standard, the terms and definitions given in GB 7251.1-2005 and the following apply.
3.1
Low-voltage reactive power compensation assembly
It refers to a kind of assembly of low-voltage switchgear(s), low voltage capacitor(s) and their relevant control, measurement, signal, protection and adjustment equipments, assembled with structural components integrally through internal electrical and mechanical connections completed by the manufacturer.
3.2
Integrative compensation assembly
It refers to a device used to conduct reactive power integrative compensation for the low-voltage reactive power compensation assemblies installed in the substation.
3.3
Paragraph compensation assembly
It refers to a device used to conduct reactive power of compensation in sections (areas) in a part (area) of the power supply and distribution system for low-voltage reactive power compensation assemblies installed on the power utilization unit or busbar at lower power factor.
3.4
Terminal compensation assembly
It refers to a device used to conduct reactive power compensation for low-voltage reactive power compensation assemblies directly mounted nearby the inductive electrical equipments.
3.5
Transient inrush current
It refers to the maximum transient current generated instantaneously once switching the capacitor.
3.6
Dynamic response time
T
It refers to the time interval from the time that the reactive variation reaches the set value to the time that the device outputs reactive power.
3.7
Fundamental (component)
The frequency component, obtained through Fourier series decomposition for the distorted power frequency alternating-current component, which is the same as that of the power frequency.
3.8
Harmonic (component)
It refers to the frequency component obtained through Fourier series decomposition of periodicity alternating current component where the fundamental frequency is the integral multiple larger than 1.
3.9
Harmonic order
h
It refers to the ratio of the harmonic frequency to the fundamental frequency.
3.10
Harmonic content (for voltage or current)
It refers to the quantity obtained by deducting the fundamental component from periodicity alternating current component.
3.11
Harmonic ratio; HR
It refers to the ratio of the root-mean-square value of the hth harmonic component included in periodicity alternating current component to that of the fundamental component (expressed in percent).The hth harmonic ratio for voltage is expressed as HRUh and the hth harmonic ratio for current is expressed as HRIh.
3.12
Total harmonic distortion; THD
It refers to the ratio of the root-mean-square value of the harmonic content in periodicity alternating current component to that of the fundamental component (expressed in percent).
The total harmonic distortion for voltage is expressed as THDu and the total harmonic distortion for current is expressed as THDi.
3.13
Rated capacity
It refers to the rated capacity (or nominal capacity) of the capacitor bank.
