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Method for calculating voltage loss of direct-current distribution line

A line voltage, DC power distribution technology, applied in the direction of DC network circuit devices, circuit devices, electrical components, etc., can solve the problem of calculating the DC power distribution lines of fire emergency lamps

Pending Publication Date: 2020-10-23
JIANGSU ZHUSEN BUILDING DESIGN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, since the common method cannot be used to calculate the current on the DC distribution line of fire emergency lamps, other methods must be used to calculate the voltage loss of the line

Method used

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  • Method for calculating voltage loss of direct-current distribution line
  • Method for calculating voltage loss of direct-current distribution line
  • Method for calculating voltage loss of direct-current distribution line

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] The iterative method is used to calculate the voltage loss of the DC distribution line of fire emergency lamps.

[0054] Step 1) By the voltage U at the end of the line T Calculate the voltage U at the beginning of the line S :

[0055] The formula for calculating the voltage loss of DC distribution lines:

[0056] ΔU=IR (1)

[0057] In the formula: ΔU - the voltage loss of the line

[0058] I - the current of the line

[0059] R——The DC resistance of the line, which can be calculated according to the relevant data in the manual

[0060] The current of the lamp can be calculated according to the current-voltage characteristics of the lamp. The calculation formula of the constant power lamp is:

[0061]

[0062] In the formula: I E - the current of the lamp

[0063] P - the rated power of the lamp

[0064] U——the input volt...

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Abstract

The invention discloses a method for calculating voltage loss of a direct-current distribution line, which adopts an iterative method to calculate voltage loss of the direct-current distribution line.The method comprises the following steps of calculating a voltage US of an initial end of a line according to the voltage UT of a tail end of the line, and setting a voltage value of a tail end of the line as UT; when the direct-current distribution line is not provided with a branch line, the line tail end voltage UT when the line starting end voltage US is equal to Un being calculated, and Un being the rated voltage of the distribution line; when the direct-current distribution line has a branch line, recalculating the voltage UT at the tail end of the branch line, and voltage loss delta uof a DC distribution line is equal to UN-UT. The method is applied to a fire-fighting emergency lighting lamp, the voltage loss of the direct-current distribution line is calculated through an iterative method, a calculation error is reduced, and therefore the current on the direct-current distribution line of the fire-fighting emergency lighting lamp is calculated more accurately.

Description

technical field [0001] The invention relates to building electrical design, in particular to a calculation method for voltage loss of DC power distribution lines. Background technique [0002] The fire emergency lighting and evacuation indication system in the building is a system that provides lighting and evacuation indication for personnel evacuation and places that still need to work in case of fire. The lamps and lanterns are powered by the emergency lighting centralized power supply or the emergency lighting distribution box. [0003] With the implementation of the national standard "Technical Standards for Fire Emergency Lighting and Evacuation Indication System" GB51309-2018, most fire emergency lamps are required to use A-type lamps (that is, DC36V and below voltage power supply to avoid electric shock during evacuation) , the new product standard GB17945 after the implementation of GB51309-2018 stipulates that the operating voltage fluctuation range of fire emerge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00G06F17/15
CPCH02J1/00G06F17/15
Inventor 杨晓东
Owner JIANGSU ZHUSEN BUILDING DESIGN