YD/T 777-2006Inversion equipment for telecommunications (English PDF)

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

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.

4.1 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...

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