YD/T 777-2006 PDF in English
YD/T 777-2006 (YD/T777-2006, YDT 777-2006, YDT777-2006)
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| YD/T 777-2006 | English | 160 |
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Inversion equipment for telecommunications
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Newer version: YD/T 777-2021 Standards related to: YD/T 777-2021
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YD/T 777-2006: PDF in English (YDT 777-2006) YD/T 777-2006
YD
Communication Industry Standard
of the People’s Republic of China
Replacing YD/T 777-1999
Inversion equipment for telecommunications
ISSUED ON. MAY 31, 2006
IMPLEMENTED ON. OCTOBER 1, 2006
Issued by. The Ministry of Industry and Information Technology of the
People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Definitions ... 6
4 Product classification ... 7
5 Requirements ... 8
6 Test methods ... 15
7 Inspection rules ... 23
8 Marks, packaging, transportation and storage ... 25
Appendix A ... 26
Appendix B ... 27
Appendix C ... 30
Foreword
This Standard replaces YD/T 777-1999 Inversion equipment for
telecommunications.
Compared with the YD/T 777-1999, this Standard has the following major
changes.
— This Standard is drafted according to the format requirements specified
in the GB/T 1.1-2000.
— DELETE the reference to the GB 7260.
— ADD the definition “3.7 Peak factor”.
— REVISE “4.1.3.1” of the original version. ADD “1.5” and “4” to this
Standard.
— REVISE “5.2” of the original version. MODIFY the allowable variation
range of the input voltage to 40 ~ 57.6V.
— DELETE “5.2.2” of the original version.
— REVISE the contents in the “5.4.2” of the original version. MODIFY the
“power factor 0.7” to “power factor 0.8” in Note 2 of the table. DECREASE
the AC output current rating.
— REVISE the contents in the “5.4.8” of the original version. STIPULATE
the AC output frequency rating as 50Hz. SEE 5.4.7 of this version.
— REVISE “5.4.9” of the original version. CANCEL the restriction of “2MHz”.
SEE 5.4.8 of this version.
— REVISE the headline of the “5.4.12” of the original version. MODIFY the
“conversion mode” to the “conversion time”. SEE 5.4.11 of this version.
— REVISE the contents in the “5.4.13” of the original version. ADD the input
requirements for inrush starting current. SEE 5.4.12 of this version.
— REVISE “5.4.14” of the original version. MODIFY the sentences. SEE
5.4.13 of this version.
— REVISE the contents in the “5.4.15” of the original version. MAKE the
grading rules for overload capacity. SEE 5.4.14 of this version.
— DELETE the requirements for temperature rise specified in the “5.4.16”
Inversion equipment for telecommunications
1 Scope
This Standard specifies the technical conditions, test methods, and inspection
rules of the DC-AC sine wave inversion equipment for telecommunications
(hereinafter referred to as “inversion equipment”), which are required for
accommodating the special requirements for communication equipment.
This Standard applies to the sine wave inversion equipment providing power
supply for the communication equipment.
2 Normative references
The provisions in the following documents become the provisions of this
Standard through reference in this Standard. For dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, parties who reach an agreement based on this
Standard are encouraged to study if the latest versions of these documents are
applicable. For undated references, the latest versions apply to this Standard.
GB/T 191 Packaging – Pictorial marking for handling of goods
GB/T 2423.1-2001 Environmental testing for electric and electronic products
– Part 2. Test methods – Tests A. Cold
GB/T 2423.2-2001 Environmental testing for electric and electronic products
– Part 2. Test methods – Tests B. Dry heat
GB/T 2423.9-2001 Environmental testing for electric and electronic products
– Part 2. Test methods – Test Cb. Damp heat, steady state, primarily for
equipment
GB/T 2829-2002 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of process stability)
GB/T 3047.1 Series of basic dimensions of panels, rack and cabinets for
vertical increment of 20mm
GB/T 3859.2 Semiconductor convertors – Application guide
GB/T 3873 General specifications for products packaging of communication
equipment
3.7 Peak factor
It refers to the ratio OF the peak value of the periodic load current TO its
effective value, which is generally used for measuring the inversion equipment’s
ability of carrying non-linear loads.
3.8 Total harmonic distortion (THD)
It refers to the percentage OF the root mean square value of the distortion
content TO that of the fundamental component in the AC quantity.
3.9 Harmonic content
It refers to the value obtained after the fundamental component is subtracted
from the AC quantity.
Note. Harmonic content can be expressed as time functions or root mean square values.
4 Product classification
4.1 Product types, specifications and series
4.1.1 Product types
a) Single-phase sine wave inversion equipment;
b) Three-phase sine wave inversion equipment;
c) Redundant single-phase or three-phase sine wave inversion equipment in
parallel.
4.1.2 Input voltage rating series
SELECT 48V from the following numerical values as the DC input voltage rating
of inversion equipment.
Note. After the user puts forward the requirement and negotiates with the manufacturer, the products
beyond the above numerical values can also be produced.
4.1.3 Output power rating series (in unit of kVA)
4.1.3.1 Single-phase sine wave inversion equipment or single-phase
sine wave inverter unit
0.5, 1, 1.5, 2, 3, 4, 5 and 10.
Note. After the user puts forward the requirement and negotiates with the manufacturer, the products
from the heat sources.
5.1.2 Special operating conditions
If it is necessary to use the inverter under the conditions which are different
from the normal operating conditions specified in the Section 5.1.1, the user
shall put forward when placing orders, and shall make an agreement with the
manufacturer. For instance.
a) The inversion equipment used in abnormal mechanical stress, such as
vehicular communication;
b) The inversion equipment operating in tropical climates with high humidity and
high temperature;
c) The inversion equipment used in the environments where the atmospheric
pressure exceeds the range of 86kPa ~ 106kPa;
d) Marine inversion equipment, or the inversion equipment operating in
maritime climates.
5.2 Input conditions of DC power supplies
The DC input voltage is 48V. The allowable variation range is 40V~ 57.6V.
Note. After the user puts forward the requirement and negotiates with the manufacturer, the inversion
equipment beyond the above numerical values can also be produced.
5.3 Input conditions of AC power supplies
The inversion equipment can be provided with bypass power supply devices.
The AC power supplies providing power supply for the bypass devices shall
conform to the following requirements.
a) The allowable variation range of AC voltage shall be 85% to 110% of the
rated value;
b) The frequency rating and the allowable deviation of AC voltage shall be
respectively 50Hz and ± 5%;
c) The unbalance degree of three-phase AC voltage shall not be greater than
10%;
d) The phase deviation of three-phase AC voltage shall not be greater than 5°
electrical degree.
Note. After the user puts forward the requirement and negotiates with the manufacturer, the products
beyond the above numerical values can also be produced.
Table 2 Conduction Disturbance Limits of AC Output Voltage
Frequency range (MHz) Limits dB (μV) Quasi-peak Mean value
0.15~0.5 79 66
0.5~30 73 60
5.4.5 Unbalance degree of three-phase output voltage
During the nominal voltage input, and under the load conditions specified in the
specific product standards, the unbalance degree of three-phase output voltage
shall not be greater than 5%.
5.4.6 Phase deviation of three-phase output voltage
During the nominal voltage input, and under the load conditions specified in the
specific product standards, the phase deviation of three-phase output voltage
shall not be greater than 5° electrical degree.
5.4.7 Output frequency ratings and stabilizing accuracy
The AC output frequency rating is 50Hz. When the input voltage and load
current (resistive load) are within the allowable variation range, the stabilizing
accuracy of the output frequency shall not be greater than ± 2%.
5.4.8 Reflected wide band noise current at the input
When the input voltage, output voltage, and output current (resistive load)
operate at rated values, the wide band noise component in the DC current (root
mean square value) shall be less than 10% of the DC current.
5.4.9 Reflected relative psophometrically weighted noise current at the
input
When the input voltage, output voltage, and output current (resistive load)
operate at rated values, the reflected relative psophometrically weighted noise
current at the input s...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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