JPH0434377A - Apparatus and method for testing connection of cable conductor - Google Patents

Abstract

PURPOSE:To carry out measurement by simply arranging a measuring person at one end of a cable by respectively preparing constant current elements having different limit current values by the number corresponding to the number of cable conductor pairs. CONSTITUTION:Currents having different known values (g.g., 1mA in a constant current element 6a, 2mA in 6b, NmkA in 6N) are allowed to flow to the respective cable conductor pairs 2a - 2N at one end of a metallic cable 1 having cable conductor pairs 2a - 2N from constant voltage sources 7a - 7N and the current values and directions from the cable conductors 2a - 2N at the other end of the cable 1 are measured by ammeters 8a - 8N to collate and detect the both corresponding ends of the cable conductors 2a - 2N. Further, the shunt crossing of the cable conductors 2 in the cable conductor pairs 2a - 2N is detected.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for installing metallic cables having a plurality of core pairs, and for connecting the cables to each other or attaching connectors to the ends of the metallic cables. The present invention relates to a core wire connection testing device and method for determining whether there are any errors.

[Prior Art] FIG. 5 shows a conventional test apparatus A for determining whether or not a core wire connection of a metallic cable is possible. In the figure, 1 is the cable, 2a to 2N are the core pairs of the cable 1, and here N
A cable 1 having a pair of core wires is shown, and 3.4 is a core switch, 3a.

4a is a section of the core wire switch 3.4, and 5 is a conduction needle.

Whether or not the cable 1 is connected without error can be determined if the conduction needle 5 is conductive with the segments 3a and 4a of the core switchers 3 and 4 in the same position.

[Problem to be solved by the invention] However, in such a connection test equipment WIA, the switching device 3.4
The positions of sections 3a and 4a must always be the same,
A worker is placed on both sides of the switch 3.4, and the section 3a is cut using a communication means such as a transceiver.

4a or by opening a separate communication line to automatically synchronize the two, requiring a large number of workers and making the equipment unnecessarily complex, leading to increased costs.

In this respect, the present invention solves the problem of having to perform measurements by placing working sounds at both ends of the cable, and provides a core connection testing device and method that can perform measurements by simply placing a measuring person at one end of the cable. Our goal is to provide the following.

[Means for Solving the Problems 1 The above problems are achieved by the present invention adopting the following characteristic configuration means and techniques.

First, the first feature of the present invention is that each core wire pair at one end of a metallic cable having a plurality of core wire pairs has a constant current that does not change even when the voltage changes and only the N current value unique to the element flows. A current element and a constant voltage source are installed in a loop for each core pair so that each core pair has a different limiting current value depending on the number of core pairs, and an ammeter is attached to the core pair at the other end of the cable. In other words, constant current elements with different limiting current values are prepared as many as the number of cable core pairs.

A second feature of the present invention is that, under the first feature, the constant voltage source attached to each core wire pair at one end of the metallic cable is replaced with a rectifying element, and an ammeter and a constant voltage source are connected to the core wire pair at the other end. This is a wire connection test device that connects a power source, that is, a constant current element and a rectifier element in series are installed between each pair of core wires at one end of the cable, and an ammeter and a rectifier are installed between each pair of core wires at the other end. A constant voltage source is installed, and the polarity of the voltage source can be reversed by a switching means, and the limiting current values of each constant current element are different from each other, and are prepared in proportion to the number of cable core pairs.

A third feature of the present invention is that, under the second feature, a constant current element is attached to each core pair at one end of the metallic cable, so that even if the current flowing through the element changes, the voltage between the elements does not change. A voltmeter and constant current source were connected to each core pair from the other end of the cable instead of an ammeter and constant voltage source. This is a core wire connection test device, in which a constant voltage element and a rectifier element are connected in series, and an ammeter and a constant current source are installed between the pair of core wires at one end of the cable, and between the pair of core wires at the other end. The limiting voltage values of each constant voltage element are different from each other, and the number of constant voltage elements is prepared in proportion to the number of cable core pairs.

A fourth feature of the present invention is to conduct or apply a current or voltage of a different known value to each core wire pair at one end of a metallic cable having a plurality of core wire pairs, and to conduct or apply a current or voltage of a different known value to each core wire pair at the other end of the metallic cable. A fiber connection test method comprising comparing and detecting the corresponding ends of each core wire pair by measuring the current value and direction from the pair, and detecting wire swapping and crossing within each core wire pair. be.

A fifth feature of the present invention is that a current or voltage of a different known value is conducted or applied in only one direction to each core wire pair at one end of a metallic cable having a plurality of core wire pairs, and the other end of the metallic cable is By measuring the current value or voltage value from each core wire pair and determining the polarity of each core wire, the corresponding ends of each core wire pair are collated and detected, and the core wires are exchanged and crossed within each core wire pair. This is a core wire connection test method characterized by detecting.

[Function] The present invention takes the above-mentioned means and techniques, and in the first characteristic means, constant current elements and constant voltage sources with different limiting current values are attached to all core pairs at one end of the cable, and at the other end. In addition, according to the second characteristic means, constant current elements and rectifying elements are attached to all the core pairs at one end of the cable, and at the other end, ammeters are attached to all the core pairs. By attaching an ammeter and a constant voltage source to the terminal, the fourth characteristic method is realized, and it is possible to check and detect the corresponding ends of each core pair from only the other end without placing an operator at one end and the other end. Replacement of core wires within a core pair, swapping of core wire pairs with each other,
It becomes possible to measure incorrect combinations of core wire pairs. In the case of the second characteristic means, a rectifying element is inserted in series with the constant current element, and even though no cable is inserted between the constant voltage source and the ammeter, the core wires in the core pair can be replaced. Since no current flows in the case of , the fifth characteristic method described above is implemented, and by determining the polarity of each core wire, it is possible to identify the core swapping intersection within the core wire pair.

Further, in the third characteristic means, a constant voltage element and a rectifier whose limiting voltage values are mutually dependent are attached to all the core wire pairs at one end of the cable, and a constant current source is attached to all the core wire pairs at the other end. By attaching a voltmeter, the fourth and fifth characteristic methods described above are realized, and the polarity of each core wire is determined in addition to matching and detecting the corresponding opposite ends of each core wire pair. This makes it possible to replace core wires within a core pair, replace core wire pairs with each other, and measure incorrect combinations of core wire pairs from only the other end without placing a person there.

[Example] (Device example 1) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram illustrating a first embodiment of the device rBe of the present invention, in which 6a to 6N are constant current elements, 1 is a cable,
2a to 2N are cable core pairs, 7a to 7N are constant voltage sources,
88-8N is an ammeter.

The constant current elements 6a to 6N are constant current elements with different limiting current values, and typical devices include constant current diodes and FETs (field effect transistors), and regardless of the magnitude of the applied voltage, the limiting current values are constant. The limiting current value corresponds to the core number and, for example, constant current element 68
An element whose current limit is 1 mA is used for , 2 mA for 6b, and NmA for 6N. It is assumed that the voltage VB generated by the constant voltage sources 7a to 7N is larger than the voltage drop caused by the product of the DC resistance of the cable core 2 and the limit current value.

(Device Example 2) Fig. 2 (a) is a diagram for explaining the second embodiment of the invention C, in which 1 is a cable, 2a to 2N are cable core pairs, and 6a to 6N are constants. Current elements 7a to 7N are constant voltage sources, 8a to 8N are ammeters, 9a to 9N are rectifying elements that allow current to flow in only one direction, and 10a to 1ON are polarity changeover switches.

The limiting current values of the constant current elements 6a to 6N are the same as those in the first embodiment shown in FIG. 1(a), and the constant current I'f sources 7a to
It is assumed that the generated voltage VB of 7N is larger than the voltage loss value expressed by the product of the direct current resistance of the cable core 2 and the limiting current value, and the sum of the voltage drop of the rectifying element.

(Apparatus Example 3) FIG. 3 shows a third embodiment of the present invention, in which the core polarity distribution distribution board 11 is inserted in the second embodiment of FIG. By switching the connection of the core wire pairs 2a to 2N using the changeover switches 12a and 12b, it is possible to share the constant voltage source 7, the ammeter 8, and the polarity changeover switch 10, thereby realizing cost reduction.

(Device Example 4) FIG. 4(a) is a diagram illustrating a fourth embodiment device fE of the present invention, in which 1 is a cable, 2a to 2N are cable core pairs, and 9a to 9N are rectifiers. Elements 138 to 13N are constant voltage elements, 148 to 14N are voltmeters, and 158 to 15N are constant current sources. The constant voltage elements 138 to 13N produce a constant voltage drop regardless of the magnitude of the flowing current, and typical elements include Zener diodes and discharge tubes, and the voltage drop is determined by the respective core numbers a-N. For example, the constant voltage element 13a is set to 1V, 13
b has a voltage drop of 2V and 13N has a voltage drop of NV. It is assumed that the currents generated by the constant current sources 158 to 15N have the same current value.

(Method Example 1) The case where the method of the first embodiment of the present invention is applied to the device N8 of the first embodiment shown in FIG. 1 will be described.

In the connection shown in Fig. 1(a), the current corresponding to the cable core numbers a-N flows through the ammeters 8a to 8N in the direction of the arrow, regardless of the magnitude of the DC resistance of cable 1, and the core wire 2 normally flows. You can see that it is connected.

On the other hand, in the connection shown in Fig. 1(b), the ammeter 8a carries the current corresponding to the core wire number A, and the ammeter 8b carries the current corresponding to the core wire number a, and the other ammeters 8a, 8c to 8N. flows in the opposite direction, the core wire pair 2a and the core wire pair 2b are exchanged, and furthermore, it is found that the core wire 2 intersects within the core wire pair 2b.

In short, the method of this embodiment is based on each core wire pair 2a at one end of the metallic cable 1 having a plurality of core wire pairs 2a to 2N.
~2N respectively different known values (for example, as described above, the constant current element 6a is 1 mA.

6b is 2mA, 6N is NmA) from constant voltage source 7a~
7N, and by measuring the current value and direction from each core wire pair 2a to 2N at the other end of the cable 1 using ammeters 8a to 8N, the corresponding ends of each core wire pair 2a to 2N are collated and detected. At the same time, interchanging of cores 1 and 2 within each fiber pair 2a to 2N is detected.

(Method Example 2) A case will be described in which the method of the second embodiment of the present invention is applied to the apparatuses B to E of the second to fourth embodiments shown in FIGS. 2 to 4.

FIG. 2(a) showing the second and third embodiment devices C to C.
In the connection shown in Figure 3, currents corresponding to cable core numbers a to N flow through ammeters 8a to 8N and 8 in the direction of the arrows regardless of the magnitude of the DC resistance of cable 1, and core wire 2 normally flows. You can see that it is connected.

On the other hand, in the connection shown in FIG. 2(1)), since a reverse voltage is applied to the rectifying element 9a, no current flows through the ammeters 8b, 8, and an abnormality is revealed. At this stage, it is not clear from the indication of the ammeter whether the wire is broken or the core wires 2 are crossed, so switch 10t) and 10 are switched to connect the constant voltage source 7b.

When the polarity of 7 is reversed, a current flows and the intersection of the two core wires in the core wire pair 2a is revealed. Also, the current value corresponds to the wire pair 2a, and on the other hand, the current corresponding to the wire pair 2b flows through the 'R current meters 8a and 8, so the wire pair 2a and the wire pair 2b are exchanged. It turns out that

Next, in the connection shown in FIG. 4(a) showing the fourth embodiment device E, each of the constant voltage elements 13a to 13 is connected to the voltmeters 14a to 14N.
The voltage represented by the sum of the voltage drop of N, the voltage drop of the rectifying elements 9a to 9N, the current from the constant current sources 15a to 15N, and the product of the direct current resistance of the cable core 2 is specified. The voltage under each rectifying element 98 to 9N is the same because the current value is constant, and the DC resistance of each cable core 1i12 is
There is no big difference between them, and the voltage drop due to the DC resistance of the cable core 2 calculated from the length of the cable 1 can be used as a representative value. By subtracting the voltage drop of the rectifying elements 9a to 9N and the voltage drop due to the DC resistance of the cable core wA2 from the indications of the voltmeters 14a to 14N, each constant voltage element 13
A voltage drop of 13N is found, indicating that the connection is normal.

On the other hand, in the connection shown in FIG. 4(b), since a reverse voltage is applied to the rectifying element 9a, no current flows through the core wire 2, and the constant current power supply 1ga
A miserable and large voltage is generated at both ends of ~15N (infinite voltage with an ideal constant current power supply of 158~15N).
! 2. An abnormality in the connection is found. At this stage, the wire is broken or the wire is broken.
Since it is not clear from the indication of voltmeter 14t) whether it is a crossing of 12, switch 1ob is changed to set the constant current
When the polarity is reversed, a voltage corresponding to the constant voltage element 13a appears, and it becomes clear that the two core wires in the core wire pair 2a intersect. Further, the voltage value corresponds to the core wire pair 2a, and since the voltage corresponding to the core wire pair 2b appears on the square voltmeter 148, it is clear that the core wire pair 2a and the core wire pair 2b have been swapped. .

In short, the method of this embodiment is based on each core wire pair 2 at one end of the metallic cable 1 having a plurality of core wire pairs 2a to 2N.
A to 2N have different known values (for example, constant current element 6a is 1mA, 6b is 2mA, 6N is NmA, constant voltage element 13a is 1V, 13b is 2V, 13N is NV) current or voltage is connected to the other end of cable 1. The constant voltage sources 7a to 7N, 7 or the constant current sources 15a to 15N are electrically connected or applied only in one direction by the rectifying elements 9a to 9N, so that each of the core wire pairs 2a to 2N at the other end of the cable 1 is connected. ! If or the voltage value, check the ammeter 8a to 8N, 8 or voltmeter 14a to the other end of the cable 1.
14N and by determining the polarity of each of the core wires 2, the corresponding ends of each of the core wire pairs 2a to 2N are collated and detected, and the replacement and intersection of the core wires 2 in each of the core wire pairs 28 to 2N is determined. Also detected.

[Effects of the Invention] Thus, according to the present invention, a cable connection test can be performed by placing an operator only at one end of the cable without separately installing the device itself, and the cable core wire It is possible to improve the efficiency of connection tests and reduce operator labor.

Furthermore, in the devices of the first and third embodiments of the present invention, the magnitude of the direct current resistance of the cable does not affect the operation of the measuring instrument, so there is no need to correct the measurement results depending on the cable length.
It has excellent effects such as being able to easily obtain stable measurement results.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram of the device according to the first embodiment of the present invention, FIG. 1(b) is an explanatory diagram of a measurement example thereof, and FIG. Configuration diagrams. FIG. 2(b) is an explanatory diagram of a measurement example, FIG. 3 is a configuration diagram of a third embodiment of the device of the present invention, and FIG. 4(a) is a diagram of the fourth embodiment of the device of the present invention. The configuration diagram, FIG. 4(b) is an explanatory diagram of a measurement example, and FIG. 5 is a configuration diagram of a conventional device.A, B, C, D, E...Core connection test devices a to N...
・Core number 1...Metallic cable 2...Core wire 2a to 2N...Core pair 6
a~6N... constant current element 7a~7N, 7... constant voltage source 8a~8N... ammeter 9a~9N... rectifier element 10a~1ON, 10... polarity changeover switch 11...
・Core polarity distribution distribution board 12a, 12b...Plug-in changeover switch 13a to 13N
... Constant voltage element 14a to 14N... Voltmeter 15a to 15N... Constant current source

Claims (1)

[Scope of Claims] 1. A constant current element in which only a current value specific to the element flows through each core wire pair at one end of a metallic cable having a plurality of core wire pairs without changing the current even if the voltage changes; A constant voltage source is installed in a loop for each core pair so that each core pair has a different limiting current value depending on the number of core pairs, and an ammeter is connected to the core pair at the other end of the cable. Core wire connection test device 2, characterized in that the constant voltage source attached to each core wire pair at one end of the metallic cable is replaced with a rectifying element, and an ammeter and a constant voltage source are connected to the core wire pairs at the other end. The core wire connection test device 3 according to claim 1, wherein the constant current element attached to each core wire pair at one end of the metallic cable is configured such that the voltage between the elements does not change even if the current flowing through the element changes, and the constant current element is attached to each core wire pair at one end of the metallic cable. It is characterized by replacing it with a constant voltage element that only generates a voltage drop, and by connecting a voltmeter and constant current source instead of the ammeter and constant voltage source to each core pair from the other end of the cable. The fiber connection test device 4 according to claim 2, conducts a current of a different known value to each core wire pair at one end of a metallic cable having a plurality of core wire pairs, and conducts a current of a different known value to each core wire at the other end of the metallic cable. A fiber connection characterized in that by measuring the current value and direction from the pair, matching and detecting the corresponding ends of each core wire pair and detecting a core swapping and crossing within each core wire pair. Test method 5: Conducting or applying a current or voltage of a different known value to each core pair at one end of a metallic cable having a plurality of core wire pairs in only one direction, and testing each core wire pair at the other end of the metallic cable. By measuring the current value or voltage value and determining the polarity of each core wire, the corresponding ends of each core wire pair are collated and detected, and also the wire swapping and crossing within each core wire pair is detected. Core wire connection test method characterized by