CN115173317B - Remote AC/DC cable wiring method - Google Patents
Remote AC/DC cable wiring method Download PDFInfo
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- CN115173317B CN115173317B CN202210906102.4A CN202210906102A CN115173317B CN 115173317 B CN115173317 B CN 115173317B CN 202210906102 A CN202210906102 A CN 202210906102A CN 115173317 B CN115173317 B CN 115173317B
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- cable
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
Abstract
The application provides a remote AC/DC cable wiring method, which comprises the following steps of: adopting four cable wires for wiring, wherein a load is hung between a first cable wire and a second cable wire at intervals, the first cable wire and a third cable wire are connected to the positive output wiring side of the power supply, and a fourth cable wire is connected to the negative output wiring side of the power supply; step 2: the second cable is connected to the first load negative electrode terminal, the lead is started from the first load negative electrode terminal, and then a positive-negative line interval is formed between the second cable and the first cable to hang the load until the end of the line; step 3: the third cable is connected to the positive side of the load after reaching the tail end of the line and is connected in parallel with the first cable; step 4: the fourth cable lead is connected to the negative side of the load at a position of one half to three quarters of the total length of the first cable line and is connected with the second cable line in parallel; the remote AC/DC cable wiring method provided by the application has the advantages of simple construction, low cost, simple implementation and high reliability, and effectively improves the balance of voltages at two ends of a load.
Description
Technical Field
The application belongs to the technical field of cable wiring, and particularly relates to a remote AC/DC cable wiring method.
Background
In the remote power supply or communication control, the load proportion of the cable equivalent resistor station is obvious, so that the transmission electric energy in the line occupies the load consumption energy to be taken into consideration. The traditional wiring generally adopts a two-core cable, is laid from a power output end to an end load in a long distance, and is connected with the load at intervals along the cable, and the wiring mode is widely applied to site construction due to the characteristics of simplicity in operation, lower cost, easy understanding of constructors and the like. However, in the application of remote power supply or communication control, the defects of the wiring mode are more remarkable as the wiring is longer: under the long distance condition, the voltage drop of the line is large, the load voltage at the tail end of the line is very different from the load voltage at the output end of the power supply, and serious unbalance exists among the load voltages in the line. The use of the load on the line is seriously affected, for example, the voltage at the end of the line is insufficient to maintain the stable operation of the equipment in the power supply occasion, and the consistency of the line control signal is poor in the communication control occasion, so that the control effect is seriously distorted. The application aims to overcome the defects of the traditional wiring and provides a wiring method with simple construction, low cost, simple implementation and high reliability. The method can be suitable for the transformation of the traditional wiring mode and the wiring of the new wiring occasion.
Disclosure of Invention
The application aims to provide a remote AC/DC cable wiring method, which aims to solve the problems of low terminal voltage and unbalanced load voltage in a circuit in remote power supply or communication control.
In order to achieve the technical purpose and the technical effect, the application is realized by the following technical scheme:
the application provides a remote AC/DC cable wiring method, which comprises the following steps:
step 1: adopting four cable wires for wiring, wherein a load is hung between a first cable wire and a second cable wire at intervals, the first cable wire and a third cable wire are connected to the positive output wiring side of the power supply, and a fourth cable wire is connected to the negative output wiring side of the power supply;
step 2: the second cable is connected to the first load negative electrode terminal, the lead is started from the first load negative electrode terminal, and then a positive-negative line interval is formed between the second cable and the first cable to hang the load until the end of the line;
step 3: the third cable is connected to the positive side of the load after reaching the tail end of the line and is connected in parallel with the first cable;
step 4: and the fourth cable lead is connected to the negative side of the load on the second cable line at a position of one half to three quarters of the total length of the first cable line.
As a further development of the application, the method is used for wiring ac/dc supply lines or for wiring communication control lines.
The application has the advantages that:
the remote AC/DC cable wiring method provided by the application has the advantages of simple construction, low cost, simple implementation and high reliability, and effectively improves the balance of voltages at two ends of a load.
Drawings
FIG. 1 is a schematic wiring diagram of the method of the present application;
FIG. 2 is a schematic diagram of the equivalent resistance of FIG. 1;
FIG. 3 is a schematic diagram of a delta-junction and star-junction equivalent transformation (delta-Y transformation) method of the equivalent resistance of FIG. 2;
FIG. 4 is a schematic diagram of the equivalent resistance of FIG. 2 after being illustrated using the delta-Y variation method;
FIG. 5 is a schematic diagram of equivalent resistance after prior art wiring;
fig. 6 is a schematic diagram of the voltage drop after wiring using the method of the present application.
Detailed Description
For the purpose of making the technical solutions and advantages of the present application more apparent, the present application will be further described in detail by way of specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The embodiment of the application provides a remote AC/DC cable wiring method, which comprises the following steps:
step 1: as shown in fig. 1, four cable wires are adopted for wiring, wherein a load is hung between a first cable wire and a second cable wire at intervals, the first cable wire and a third cable wire are connected to a positive power output wiring side, and a fourth cable wire is connected to a negative power output wiring side; the total length of the first cable and the third cable is the same;
step 2: the second cable is connected to the first load negative electrode terminal, the lead is started from the first load negative electrode terminal, and then a positive-negative line interval is formed between the second cable and the first cable to hang the load until the end of the line;
step 3: the third cable is connected to the positive side of the load after reaching the tail end of the line and is connected in parallel with the first cable;
step 4: the fourth cable lead is connected to the negative side of the load on the second cable wire at a position of one half to three quarters of the total length of the first cable wire;
the equivalent resistance after wiring is shown in FIG. 2, R in FIG. 2 1 For the power supply side to the first load R L1 Is equal to the cable equivalent resistance R 2 For the first load R L1 To a second load R L2 And so on, R k For the kth load R Lk Is a cable equivalent resistance of (2); the traditional wiring mode is load R L1 、R L2 、…、R Lk Is hung between the first cable and the second cable at intervals, and is characterized by the presence of resistance (R in FIGS. 2 and 5 1 、R 2 、…、R k ) The mode on the remote power supply line has larger loss, the voltage drop is increased layer by layer and is in nonlinear increment, and the unbalance of each load voltage in the line is serious; the wiring method provided by the application is characterized in that a third cable and a fourth cable are additionally added on the basis of original wiring, as shown in the schematic diagram of fig. 1, the third cable is connected to the positive output wiring side of a power supply, then is directly led to the tail end of the line, is connected to the positive side of a load and is connected in parallel with the first cable, and the equivalent resistance is R x3 The fourth cable is connected to the negative output wiring side of the power supply, then is directly led to the position of one half to three quarters of the total length of the second cable, is connected to the negative side of the load on the second cable, and the equivalent resistance of the fourth cable is R x4 ；
To further illustrate the calculation of the present method, FIG. 3 shows a meter of the present methodThe equivalent resistance triangle connection and star connection equivalent transformation (delta-Y transformation) used in time is hereinafter referred to as delta-Y transformation. Obviously, R 2 、R L1 And satisfy R L2 Delta connection of the three-terminal passive network is suitable for delta-Y conversion, and the equivalent resistance after conversion is shown in a star-shaped connection part on the right side of the figure 3, wherein:
R B1 ＝(R L1 +R 2 )×R 2 /(R L1 +2×R 2 +R L2 ) (1)
R B2 ＝R 2 ×R L2 /(R L1 +2×R 2 +R L2 ) (2)
R B3 ＝R L2 ×(R L1 +R 2 )/(R L1 +2×R 2 +R L2 ) (3)
equivalent resistance after transformation and R 3 、R L3 And a new delta-connection can be formed, and other equivalent resistances in the circuit can be calculated by analogy according to the calculation mode.
According to the schematic and transformation method of fig. 3, the equivalent resistance of fig. 2 can always be equivalent to the equivalent resistance of fig. 4. In the equivalent resistance diagram of FIG. 4, it can be seen that the current flows from the positive electrode to R X3 And R is 1 Finally at R LBM Summarized and passed through R X4 And flows back to the negative electrode. And it can be seen that the equivalent resistance R is compared from the head end and the tail end of the cable to the middle k And R is B1 Resistance value is consistent, resistance R k-1 And R is B2 Resistance is uniform until R x4 And the front equivalent resistance and the rear equivalent resistance in the circuit are symmetrical in pairs until the wiring is positioned. If R is x4 Just access to the middle of the cable, and R x3 Resistance value and R 1 In agreement, it is apparent that the line end voltage and the line start point are substantially in agreement. In practical application, R x4 Ratio R 1 The resistance value is large, and in order to better improve the line terminal voltage, a fourth cable R x4 The cable is generally connected to the total length position of the first cable of 0.5 to 0.75, so that the voltage lifting effect of the circuit is optimal;
the equivalent circuit after wiring by the prior art is shown in the figure5, calculating the front and rear load voltages, here denoted by R L3 Load as an example, load R L3 The relation between the front load voltage and the rear load voltage is shown as a formula (4):
UR L3 ＝UR L2 +(I 3+ +I 3- )×R 3 (4)
wherein: UR (UR) L3 For the load R L3 Voltage at two ends, UR L2 For the load R L2 Voltage at two ends R 3 Is the resistance of the cable, I 3+ And I 3- For flowing through cable resistance R 3 The current flow of (2) is opposite; it can be seen that the back-stage load is increased along with the increase of the number of the front-stage loads and the increase of the cable lines, and the loop ends of the front-stage cables bear the total current of all the back-stage loads, so that the voltage drop of the lines is gradually increased; for example, R n Resistance withstand flow through R Ln And R is Lk R, R 2 Resistance withstand flow through R L2 After which the current of all load resistors. The larger the bearing current is, the faster the voltage drop is, so the voltage drop slope of the two ends of the load is inclined at the beginning, the voltage balance of the two ends of the load is poor, and the voltage balance of the two ends of the load is improved more generally even if the line diameter multiple is increased like the curve in the middle of the graph in the graph 6;
after the wiring method of the application is applied, the equivalent circuit according to FIG. 2 shows that the current flowing through the cable resistance is uniform in the up-down direction and finally in R x4 Collecting the positions, flowing into the cathode, calculating the load voltage before and after the load voltage, and using R L3 Load as an example, load R L3 The relation between the front load voltage and the rear load voltage is shown in the formula (5):
UR L3 ＝UR L2 +(I 3+ -I 3- )×R 3 (5)
wherein: UR (UR) L3 For the load R L3 Voltage at two ends, UR L2 For the load R L2 Voltage at two ends R 3 Is the resistance of the cable, I 3+ And I 3- For flowing through cable resistance R 3 As shown in fig. 3;
as can be seen from equation (5), the front-to-back voltage relationship of each cable segmentThe current value difference is only related to the cable equivalent resistance, and the current direction flowing through the cable is consistent, so that the voltage drop of the loop load at the rear stage relative to the loop load at the front stage is very small, and R is added x3 The shunt effect of the circuit, the voltage in the whole circuit is relatively balanced; compared with the traditional wiring formula (4), the voltage drop is obvious. According to an actual test, a 50-stack lamp is connected for 2 km, the voltages at the front end and the rear end are the same, the voltage at the middle part is only 2V different from the voltage at the front end and the rear end, and the effect is very good.
It can be seen that the wiring method provided by the application thoroughly changes the equivalent resistance of the original whole wiring line, and the voltage drop at the tail end of the line can be effectively reduced through testing, as shown in the uppermost curve shown in fig. 6, the abscissa in fig. 6 is the load number uniformly connected in the cable line, and the ordinate is the voltage at two ends of the corresponding load, so that the balance of the load voltage in the line can be ensured.
In one embodiment, the method is used for wiring of ac/dc power supply lines or communication control lines.
Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in some embodiments," "in one embodiment," or "in an embodiment" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Additionally, the various elements of the drawings are for illustrative purposes only and are not drawn to scale.
Having thus described several aspects of at least one embodiment of this application, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the application.
Claims (2)
1. A remote AC/DC cable wiring method is characterized by comprising the following steps:
step 1: adopting four cable wires for wiring, wherein a load is hung between a first cable wire and a second cable wire at intervals, the first cable wire and a third cable wire are connected to the positive output wiring side of the power supply, and a fourth cable wire is connected to the negative output wiring side of the power supply;
step 2: the second cable is connected to the first load negative electrode terminal, the lead is started from the first load negative electrode terminal, and then a positive-negative line interval is formed between the second cable and the first cable to hang the load until the end of the line;
step 3: the third cable is connected to the positive side of the load after reaching the tail end of the line and is connected in parallel with the first cable;
step 4: and the fourth cable lead is connected to the negative side of the load on the second cable line at a position of one half to three quarters of the total length of the first cable line.
2. The remote ac/dc cable routing method according to claim 1, wherein: the method is used for wiring of AC/DC power supply lines or communication control lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210906102.4A CN115173317B (en) | 2022-07-29 | 2022-07-29 | Remote AC/DC cable wiring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210906102.4A CN115173317B (en) | 2022-07-29 | 2022-07-29 | Remote AC/DC cable wiring method |
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| CN115173317A CN115173317A (en) | 2022-10-11 |
| CN115173317B true CN115173317B (en) | 2023-08-11 |
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