JP2000304727A - Method and device for judging conformity/non-conformity of connection part of aluminum cable steel reinforced - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make detectable whether a connection state is conforming or not by a non- destructive inspection method by comparing detection output that is obtained by performing detection with a specific phase from the output of a detection coil that is moved to the connection part of an aluminum cable steel reinforced with a specific interval with a standard value. SOLUTION: A mutual induction coil 11 of a detection means 10 is assembled in a flex saddle shape so that coils L1-L4 are wound and overlapped in a long circle diameter shape and an aluminum cable steel reinforced 1 is surrounded with a specific interval. The coils L1 and L3 that are retained in an air-core state are also in the same structure. Variable resistors R1 R2 are subjected to bridge connection to the secondary coils L3 and L4, and each pair is retained in an air-core state and zero-point adjustment is made. The other pair L2 and L4 are allowed to oppose a target, one pair L1 and L3 are retained in an air-core state, the primary coils L1 and L2 are energized by a low-frequency power supply for generating an eddy current in the target, and the difference in induction output appearing at the secondary coils L3 and L4 is taken out. A phase detection circuit 12 performs the phase detection of the output difference with a specific phase. A judgment circuit 14 compares the detection output with a specific threshold to judge whether connection is appropriate or not by judging the compression of an aluminum sleeve 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a steel core aluminum stranded wire (hereinafter referred to as ACSR) using a steel sleeve and an aluminum sleeve.
The method and apparatus for determining the quality of the connection section.

[0002]

2. Description of the Related Art ACSR is a single electric wire in which an aluminum wire is wrapped around a galvanized steel wire in a stranded state. The aluminum wire is used as a main conductor, and is provided with corrosion resistance by zinc plating. The steel wire gives tensile strength. This ACSR
Is widely used in power transmission and distribution equipment including electric railways, especially in the tunnel of a train line, to detect early in the event of a ground fault, etc. AT protection wire, ground fault conductor, etc.

[0003] This ACSR is usually 300 m for a transmission line.
It is supported in every degree, and it is generally 50m
It is supported at intervals and connected every 1000 m for use.

The connection of the ACSR is performed as follows. First, as shown in FIG.
The aluminum stranded wire 2 at the end of R1 is cut to expose the steel core 3. Next, as shown in FIG. 8, the steel core 3 at the exposed end is inserted into the steel sleeve 4 so as to abut each other, and the steel sleeve 4 is compressed by a die or the like, so that the inner steel core 3 Closely integrated with the steel sleeve 4. Further, as shown in FIG. 9, an aluminum wire 5 is tightly wound and buried in a gap between the steel sleeve 4 and the aluminum stranded wire 2. Prior to the close winding, a compression display piece 6 made of aluminum is fitted on the cut end of the aluminum stranded wire 2 as shown in FIG. The compressed display piece 6 is formed by a pair of thin strips 6c, 6c extending in the longitudinal direction along the outer surface of the aluminum stranded wire 5 from both sides of a disc-shaped base 6b having a cutout hole 6a fitted in the steel core 3. Is extended, and a mark 6d for alignment is printed on the end of the strip 6c.

[0005] Next, as shown in FIG. 10, an aluminum sleeve 7 is put over the connection portion, and the edge of the aluminum sleeve 7 is made to coincide with the mark 6d of the compression display piece, and is compressed by a die or the like. The wire 2 and the aluminum sleeve 7 are tightly integrated.

Thereafter, as shown in FIG. 11, zinc chromate 8 as a filling adhesive is injected into an internal gap from an injection screw hole 7a formed on one side of the central portion of the aluminum sleeve 7. This is to eliminate internal gaps, prevent water from entering inside, prevent corrosion, and increase mechanical strength by eliminating internal rattling. In this operation, first, a threaded nozzle of a tube containing a zinc chromate (not shown) is screwed into the screw hole 7a, and the zinc chromate is injected until no internal gap is left. Next, an aluminum screw 9a for closing is screwed into the screw hole 7a.
Break off b. Thus, the connection operation is completed.

[0007] The pass / fail inspection of the connection portion performed in this manner is as follows.
Conventionally, visual inspection was performed only by visual inspection.

[0008]

The above connection of the ACSR requires the steel sleeve 4 to be located at the center of the aluminum sleeve 7 in the longitudinal direction. If the position is deviated, the contact resistance between the aluminum sleeve 7 and one of the connecting portions of the aluminum stranded wire 2 increases, which causes a decrease in the power supply voltage and also causes a disconnection due to heat generation.

Although the positioning is performed by the above-mentioned compression indicating piece 6, the length of cutting off the aluminum stranded wire 2 may be different on the left and right, or the interval between the steel sleeve 4 and the aluminum stranded wire 2 may be different on the left and right. 4 may not be located at the center of the aluminum sleeve 7 in the longitudinal direction. Also, the usage of the compressed display piece 6 may not be erroneously attached to a regular position,
In some cases, work is performed without using this.

In some cases, the aluminum winding 5 for filling the gap between the steel sleeve 4 and the aluminum stranded wire 2 shown in FIG. 9 may be forgotten. Also in this case, the resistance value increases, the power supply voltage decreases, and heat is generated, which causes disconnection.

Further, the compression of the aluminum sleeve 7 may be insufficient due to the use of a wrong die or the like.
In addition, the contact with the aluminum winding 5 becomes insufficient, the resistance of this portion becomes large, the power supply voltage is reduced, and there is a case where the wire is broken due to heat generation.

However, in the visual inspection, the internal state of the connection portion,
That is, the position of the steel sleeve 4, the presence or absence of the aluminum winding 5,
Also, the connection state between the aluminum sleeve 7 and the aluminum stranded wire 2 cannot be seen. Therefore, these connection failures cannot be found, and conventionally, it has been determined that the construction of the ACSR connection portion was incomplete before the inconvenience such as an accident occurred.

[0013] Therefore, the present invention, after the ACSR connection work,
An object of the present invention is to provide a determination method and a device capable of detecting a good or bad connection state in an aluminum sleeve by a nondestructive inspection method.

[0014]

According to a first aspect of the present invention, there is provided a method for judging the quality of a connection portion of a steel core aluminum stranded wire according to the first aspect of the present invention. Exposed by cutting and removing the aluminum stranded wire, the steel core was butt-inserted into the steel sleeve and connected by compressing the steel sleeve. A method of judging the quality of the connection part of a steel core aluminum stranded wire, in which an aluminum sleeve is fitted so as to extend to compress the aluminum sleeve and connect the aluminum stranded wire. Is moved along the connection of the steel core aluminum stranded wire at a predetermined interval, and the output of the detection coil is detected at a predetermined phase, and the detected output is compared with a standard value. Internal state It detects, and performs quality determination of the connection portion.

The method of the present invention detects a connection state of a steel core aluminum stranded wire by applying a standard comparison type eddy current testing method. In the standard comparison method, an AC magnetic field is applied to the object to be detected, the induced output due to the eddy current generated at that time is detected at a predetermined phase, and under the same conditions, the detected output is compared with the detected output when the standard object is detected. In addition, it observes the state of an object to be detected, and has a feature that high detection accuracy can be obtained. Detecting at the predetermined phase means fixing the detection phase, which can simplify the detection circuit. As this phase, for example, a phase having the maximum sensitivity with respect to the steel sleeve in the aluminum sleeve is used.

According to a second aspect of the present invention, the method of the first aspect is embodied as an apparatus, and the detection coil of the standard comparison system and the detection coil are made of a steel core aluminum which is an object to be detected. A moving means for moving the wire along the connection portion at a predetermined interval, a detection circuit for detecting the output of the detection coil at a predetermined phase, and an internal state of the connection portion by comparing the detection output with a standard value And a judgment circuit for judging the quality of the connection portion.

According to a third aspect of the present invention, in the apparatus for judging the quality of a connection portion of a steel core aluminum stranded wire according to the second aspect, the judgment circuit includes a steel core whose detection target is a detection output of the detection circuit. Measure the position of both ends of the steel sleeve with respect to the aluminum sleeve in comparison with the standard value prepared as a value when the wire diameter is normally connected to aluminum, and judge the quality of the position of the steel sleeve with respect to the aluminum sleeve Characterized in that:

According to a fourth aspect of the present invention, in the apparatus for judging the quality of the connection portion of the steel cored aluminum stranded wire according to the second aspect, the judgment circuit is provided between the aluminum stranded wire and the steel sleeve within the aluminum sleeve. Compare the detection output of the detection circuit in the range where the aluminum winding in the gap is wound with the standard value prepared as the value when the wire diameter of the steel core aluminum to be inspected is normally connected. The present invention is characterized in that the presence or absence of an aluminum winding at a connection portion of an aluminum stranded wire is determined.

According to a fifth aspect of the present invention, there is provided a method for judging the quality of a connection portion of a steel core aluminum stranded wire, wherein the maximum output is determined by the size of the space (including the case where the space is filled with an adhesive) on the inner surface of the aluminum sleeve. By using the fact that the detection phase obtained varies, it provides a method of judging the quality of the connection part of the steel core aluminum stranded wire.
While changing the detection phase, it is moved at a predetermined interval along the connection of the steel core aluminum stranded wire, which is the detection target, and the detection output obtained by detecting each part at the phase where the maximum output is obtained is obtained. Compared with a standard value, the quality of the connection failure due to the poor compression of the aluminum sleeve is determined from the phase difference.

According to a sixth aspect of the present invention, there is provided an apparatus for judging the quality of a connection portion of a steel core aluminum stranded wire, comprising the steps of:
FIG. 4 shows an embodiment configured as an apparatus, in which a detection coil of a standard comparison method and a moving means for moving the detection coil along a connection portion of a steel core aluminum stranded wire which is a detection target at a predetermined interval. And a detection circuit that detects the phase of the output of the detection coil while changing the detection phase, measures the phase at which the maximum output of each part is obtained, and compares this phase with a standard value. It is characterized by including a judgment circuit for judging the quality of connection failure due to compression failure.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The detection principle in the present invention will be described. For example, as shown in FIG. 1, the detection position is changed to A, B, and C with respect to the steel cored aluminum stranded wire 1 and the phase is changed to check the phase at which the maximum output is obtained and the voltage amplitude at that time. FIG. 2 shows a secondary plane. FIG. 2A shows a case where the excitation frequency of the primary coil is low, and FIG. 2B shows a case where the excitation frequency is high. In the drawing, a1 is a value obtained by measuring the steel sleeve 4 through the aluminum sleeve 7, b1 is a value obtained by measuring the aluminum stranded wire 2 through the aluminum sleeve 7, c1
Is a value obtained by measuring the aluminum winding 5 via the aluminum sleeve 7.

When there is a gap between the aluminum sleeve 7 and the connection part of the steel core aluminum stranded wire due to poor compression of the aluminum sleeve 7, the output when phase detection is similarly performed at the positions A, B, and C is as follows. , A2, b2, c2. Further, when the compression of the aluminum sleeve 7 is normal but the phase of the gap between the steel sleeve 4 where the aluminum winding is not wound and the aluminum stranded wire 2 is detected, the output is c3.

2 (a) and 2 (b), the excitation frequency is different, and the detection phase at which the maximum output is obtained is different. However, if there is a gap between the aluminum sleeve 7 and the internal connection, the maximum output will be lower. It can be seen that the phase obtained is shifted. Regardless of the presence or absence of the gap, the values a1, a2 measured on the steel sleeve 4 via the aluminum sleeve, the values b1, b2 measured on the aluminum stranded wire 2 via the aluminum sleeve, and the aluminum winding via the aluminum sleeve 7 The amplitude is clearly different from the measured values c1 and c2 of the line 5. Output c when phase detection is performed in the gap between the steel sleeve 4 where the aluminum winding 5 is not wound and the aluminum stranded wire 2
In the case of (a), the amplitude of 3 is clearly different from the other portions, but the phase change is small. In the case of (b), the phase is clearly different, but the change in amplitude is small. This indicates that there are excitation frequencies suitable for detecting the amplitude and detecting the phase, respectively.

Therefore, the excitation frequency is selected to an appropriate value, and the above-mentioned a is set in advance with respect to the steel core aluminum stranded wire in which the aluminum sleeve 7 is normally compressed and fixed for each wire having a different wire diameter.
1, b1, c1, and c3 are measured, and the respective values are recorded as standard values. Then, the detection coil is moved along the aluminum sleeve of the steel core aluminum stranded wire that is the test object, the detection phase is changed, and the phase and amplitude at which the maximum output is obtained are examined. Compare with value. For example, it is possible to determine the position of both ends of the steel sleeve 4 with respect to the aluminum sleeve 7 by comparing the amplitudes, determine the quality of the position, and determine the presence or absence of the aluminum winding 5 at the same time. Also, by comparing the phases, it is possible to determine whether there is a connection failure due to the quality of the compression of the aluminum sleeve 7.

In the above method, the detection phase is changed. However, when only the standard value and the amplitude are compared, the configuration of the detection circuit and the judgment circuit is simplified by fixing the detection phase, thereby reducing the cost. Becomes possible.

The fixed detection phase is, for example, a phase at which the detection sensitivity of the steel sleeve 4 in the aluminum sleeve 7 is maximized. At this time, as shown in FIG. 1 (c), the detection output of the air core is taken at the origin O, and the vector T extending from the origin O to a1 is the phase at which the steel sleeve in the aluminum sleeve has the maximum sensitivity. It becomes the detection output. At this time, when the positions of the aluminum stranded wire 2 in the aluminum sleeve 2, the aluminum winding 5 in the aluminum sleeve, and the forgotten aluminum winding 5 are measured at this phase, the phase detection output is as follows.
The point, c1 point, and c3 point are projected onto the vector T, and each part can be identified only by this amplitude.

FIG. 3 shows an embodiment of an apparatus for performing the method of the present invention. In FIG. 3, reference numeral 10 denotes a detecting means, which comprises a mutual induction coil 11 and a phase detection circuit 12. 1
Numeral 3 denotes a moving means for moving the detecting means 10 along the aluminum sleeve 7 of the steel core aluminum wire connecting portion at a predetermined interval. Reference numeral 14 denotes a determination circuit which determines whether or not the longitudinal position of the steel sleeve is good, whether or not there is an aluminum winding in the aluminum sleeve, and whether or not the compression of the aluminum sleeve 7 is good, from the output of the detection means 10 according to a predetermined threshold value. The presence or absence of a connection failure is determined.

The mutual induction coil 11 is, for example, shown in FIG.
Use the one with the configuration shown in. For example, as shown in FIG. 5A, each of the coils L1, L2, L
3 and L4 are wound into an elliptical shape having a large ratio of the major axis to the minor axis, and then overlapped. Then, as shown in FIG. It is assembled in a saddle shape bent in an inverted U-shape so as to surround it at an interval.
The coils L1, L3 kept in the air-core state are also coils L2, L4.
And the same structure. FIG. 5C shows a state where both the coils L1 and L3 and the coils L2 and L4 are in the air-core state for zero-point adjustment. Such a winding structure is used to excite the steel cored aluminum stranded wire 1 from the entire circumference to improve the sensitivity. In this embodiment, since the mutual induction coil 11 is employed, the self-induction type Stable and high-precision inspection is possible as compared with the case where a coil is used.

The coil winding structure may be a flat structure as shown in FIG. This structure is suitable for testing the connection of a steel core aluminum stranded wire having a relatively small diameter.

In the detection coil, variable resistors R1, R2 are bridge-connected to the secondary coils L3, L4, and each pair is kept in an air-core state to perform zero point adjustment. The other pair L2, L4 wound facing the object to be detected (or a standard object) is kept facing the object to be detected (or a standard object), while the other pair L1, L3 wound is kept in an air-core state, and a low frequency (1 Hz to 10 KHz) AC power source From the primary coil L
1 and L2 are energized to excite the object to be detected to generate an eddy current, to extract the difference between the induced outputs appearing in the secondary coils L3 and L4, and to perform phase detection at a predetermined phase. This detection output is
The state of the detection target can be detected by comparing the detection output obtained when the standard is measured.

The detection coil of this standard comparison system is
In addition, a self-induction coil as shown in FIG. 6 can be employed. This is because a single coil performs both the excitation and the induction, and the coil L maintained in the air-core state
5 and a coil L6 facing the detection target (standard). The coils L5 and L6 are connected to variable resistors R3 and R4 to form a bridge, and a low-frequency AC power supply 8 applies a low-frequency voltage. When both coils are kept in the air-core state and the zero-point adjustment is performed by the variable resistors R3 and R4, and the measurement is performed with the object to be detected facing one of the coils L6, the impedance is impaired due to the difference in the opposed materials. An equilibrium occurs, which is extracted as a voltage. This voltage is subjected to phase detection at a predetermined phase, and the state of the detection target can be detected by comparing the voltage with a detection output obtained by measuring a standard.

The mutual induction coil 11 is provided with a magnetic saturation device (not shown) to magnetically saturate the steel part of the ACSR in the detection range to perform eddy detection under the same conditions as aluminum, which is a nonmagnetic material. May be added.

The phase detection circuit 12 is composed of a phase shift circuit 12a and a detection circuit 12b. The difference between the inductive outputs generated in the secondary coils L3 and L4 is used to fix the detection phase. Detection is performed at the phase at which the maximum output is obtained when the sleeve is detected. When the detection phase is changed, the detection phase is changed within a preset angle range.

The moving means 13 has a guide roller for keeping a constant distance from the steel core aluminum strand 1 and is moved from one end of the aluminum sleeve 7 to the other end by, for example, an operator. This moving means 13 generates a signal indicating the moving distance, and this signal can be used as a reference signal for specifying the detection position of the steel cored aluminum stranded wire connection.

The judgment circuit 14 compares the output of the phase detection circuit 12 with a predetermined threshold value, and based on the reference signal output from the moving means 13, determines whether the longitudinal position of the steel sleeve 4 with respect to the aluminum sleeve is good or bad. The determination, the presence / absence of the aluminum winding 5, and the presence / absence of a connection failure based on the quality of the compression of the aluminum sleeve 7 are performed.

Whether the longitudinal position of the steel sleeve 4 with respect to the aluminum sleeve in the longitudinal direction and the presence / absence of the aluminum winding 5 by the determination circuit 14 are determined at each part of the aluminum sleeve 7 as shown in FIGS. By comparing the amplitude of the detected detection output with the standard value, the position of both ends of the steel sleeve 4 is specified and the detection is performed.

The determination of the quality of the compression of the aluminum sleeve 7 by the determination circuit 14 is based on the fact that the phase at which the maximum output is obtained when the detection phase is changed changes as shown in FIG. A pass / fail judgment is made based on the magnitude of the phase fluctuation. This phase comparison can be performed on the measured values of each part of the aluminum sleeve. For example, the phase comparison can be performed using only the detection outputs a1 and a2 of the steel sleeve.

These judgment outputs can be output and displayed as detection output values in addition to a mere quality judgment, and can be recorded in a recorder as required.

[0039]

The invention according to claim 1 of the present invention is based on the standard comparison method, and determines whether or not the position of the steel sleeve relative to the aluminum sleeve at the connection portion of the steel core aluminum stranded wire at a predetermined detection phase and the aluminum filling the gap. The completion inspection after the connection work regarding the presence or absence of the winding can be performed with high accuracy by the non-destructive inspection method, and the accident that has occurred due to leaving the connection part in the poor construction state for a long time can be prevented.

According to a second aspect of the present invention, the method of the first aspect is embodied as an apparatus, and this configuration allows a specific inspection.

According to a third aspect of the present invention, there is provided specific means for determining whether or not the position of the steel sleeve relative to the aluminum sleeve is good in the apparatus of the second aspect.

According to a fourth aspect of the present invention, there is provided specific means for judging the presence or absence of an aluminum winding, which is performed in the apparatus of the second aspect.

According to a fifth aspect of the present invention, there is provided a method for judging the quality of a connection portion of a steel cored aluminum stranded wire by utilizing the fact that a detection phase at which a maximum output is obtained fluctuates. Pass / fail judgment can be made.

According to a sixth aspect of the present invention, the method of the fifth aspect is embodied as an apparatus. With this configuration, a specific inspection of a connection failure due to a compression failure of the aluminum sleeve becomes possible. .

[Brief description of the drawings]

FIG. 1 is a diagram showing a detection position and a standard value of a phase detection output when a connection portion of a steel core aluminum stranded wire is inspected according to the present invention.

FIG. 2 is a diagram illustrating a phase and a voltage amplitude at which a maximum output is obtained when a connection portion of a steel core aluminum stranded wire is subjected to phase detection in a two-dimensional voltage plane.

FIG. 3 is a diagram showing a configuration example of a device of the present invention.

FIG. 4 is a diagram showing an example of a mutual induction coil of a standard comparison method.

FIG. 5 is a diagram illustrating the coil structure of FIG. 4;

FIG. 6 is a diagram showing an example of a self-induction coil of a standard comparison method.

FIG. 7 is a diagram showing a steel core aluminum stranded wire obtained by cutting and removing an aluminum stranded wire at an end portion.

FIG. 8 is a view for explaining connection of a steel core by a steel sleeve.

FIG. 9 is a diagram showing a state in which aluminum wires are wound on both sides of a steel sleeve in a steel core aluminum stranded wire connected by a steel sleeve.

FIG. 10 is a sectional view of a connection portion of a steel core aluminum stranded wire to be tested according to the present invention.

FIG. 11 is a sectional view illustrating a method of injecting an adhesive into a gap inside a connection portion of a steel core aluminum stranded wire;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Steel core aluminum stranded wire (ACSR) 2 Aluminum stranded wire 3 Steel core 4 Steel sleeve 5 Aluminum winding 7 Aluminum sleeve 10 Detecting means 11 Mutual induction type coil 12 Phase detection circuit 13 Moving means 14 Judgment circuit a1: Inside of aluminum sleeve Phase detection output of steel sleeve (normal compression) a2: Phase detection output of steel sleeve in aluminum sleeve (insufficient compression) b1: Phase detection output of aluminum stranded wire in aluminum sleeve (normal compression) b1: Inside of aluminum sleeve Phase detection output of aluminum stranded wire (insufficient compression) c1: Phase detection output of aluminum winding in aluminum sleeve (normal compression) c1: Phase detection output of aluminum winding in aluminum sleeve (insufficient compression) c3: winding Phase detection output of forgotten aluminum winding position

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[Procedure amendment]

[Submission date] May 15, 2000 (2000.5.1)
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

The connection of the ACSR is performed as follows. First, as shown in FIG.
The aluminum stranded wire 2 at the end of R1 is cut to expose the steel core 3. Next, as shown in FIG. 8, the steel core 3 at the exposed end is inserted into the steel sleeve 4 so as to abut each other, and the steel sleeve 4 is compressed by a die or the like, so that the inner steel core 3 Closely integrated with the steel sleeve 4. Further, as shown in FIG. 9, an aluminum wire 5 is tightly wound and buried in a gap between the steel sleeve 4 and the aluminum stranded wire 2. Prior to the close winding, a compression display piece 6 made of aluminum is fitted on the cut end of the aluminum stranded wire 2 as shown in FIG. The compression indicating piece 6 is formed by a pair of thin strips 6c, 6c extending in the longitudinal direction along the outer surface of the aluminum stranded wire 2 from both sides of a disc-shaped base 6b having a cutout hole 6a fitted into the steel core 3. Is extended, and a mark 6d for alignment is printed on the end of the strip 6c.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

2 (a) and 2 (b), the excitation frequency is different, and the detection phase at which the maximum output is obtained is different. However, if there is a gap between the aluminum sleeve 7 and the internal connection, the maximum output will be lower. It can be seen that the phase obtained is shifted. Regardless of the presence or absence of the gap, the values a1, a2 measured on the steel sleeve 4 via the aluminum sleeve, the values b1, b2 measured on the aluminum stranded wire 2 via the aluminum sleeve, and the aluminum winding via the aluminum sleeve 7 The amplitude is clearly different from the measured values c1 and c2 of the line 5. Output c when phase detection is performed in the gap between the steel sleeve 4 where the aluminum winding 5 is not wound and the aluminum stranded wire 2
In the case of (a), the amplitude of 3 is clearly different from the other portions, but the phase change is small. In the case of (b), the phase is clearly different, but the change in amplitude is small. From this result , it can be seen that there are excitation frequencies suitable for detecting the amplitude and for detecting the phase, respectively.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

The fixed detection phase is, for example, a phase at which the detection sensitivity of the steel sleeve 4 in the aluminum sleeve 7 is maximized. At this time, as shown in FIG. 2 (c), the detection output of the air core is taken at the origin O, and the vector T extending from the origin O to a1 is the phase T at which the steel sleeve in the aluminum sleeve has the maximum sensitivity. It becomes the detection output. At this time, when the positions of the aluminum stranded wire 2 in the aluminum sleeve 2, the aluminum winding 5 in the aluminum sleeve, and the forgotten aluminum winding 5 are measured at this phase, the phase detection output is as follows.
The point, c1 point, and c3 point are projected onto the vector T, and each part can be identified only by this amplitude.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

The mutual induction coil 11 is, for example, shown in FIG.
Use the one with the configuration shown in. For example, as shown in FIG. 5A, each of the coils L1, L2, L
3, overlapping L4 respectively of after forming the wound in an oval shape larger diameter and the ratio of the minor, as further shown in FIG. 5 (b), the coil L2, L4, predetermined intervals from the line steel core aluminum Is assembled in a saddle shape bent in an inverted U-shape so as to surround the same. The coils L1, L3 maintained in the air-core state have the same structure as the coils L2, L4. FIG. 5C shows a state where both the coils L1 and L3 and the coils L2 and L4 are in the air-core state for zero-point adjustment. Such a winding structure is used to excite the steel core aluminum stranded wire from the entire circumference to improve the sensitivity. In this embodiment, since the mutual induction type coil 11 is adopted, the self induction type coil is used. A stable and highly accurate inspection can be performed as compared with the case of using.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

In the detection coil, variable resistors R1, R2 are bridge-connected to the secondary coils L3, L4, and each pair is kept in an air-core state to perform zero point adjustment. Overlapping the other pair L2, L4 wound to face the detection object (or standards), keeping the one of the pair L1, L3 wound superimposed on an air-core state, or AC power of a low frequency (1 Hz to 10kHz) Primary coil L
1 and L2 are energized to excite the object to be detected to generate an eddy current, to extract the difference between the induced outputs appearing in the secondary coils L3 and L4, and to perform phase detection at a predetermined phase. This detection output is
The state of the detection target can be detected by comparing the detection output obtained when the standard is measured.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

The detection coil of this standard comparison system is
In addition, a self-induction coil as shown in FIG. 6 can be employed. This is because a single coil performs both the excitation and the induction, and the coil L maintained in the air-core state
5 and a coil L6 facing the detection target (standard). This coil L5, L6 constitute a bridge by connecting a variable resistor R3, R4, adding low-frequency AC power supply or al low frequency voltage. After keeping both coils in the air-core state and performing zero-point adjustment with variable resistors R3 and R4, one coil L
When measurement is performed with the object to be detected facing 6, an imbalance in impedance occurs due to the difference in the facing material, and this is taken out as a voltage. This voltage is subjected to phase detection at a predetermined phase, and the state of the detection target can be detected by comparing the voltage with a detection output obtained by measuring a standard.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 Aluminum core stranded wire (ACSR) 2 Aluminum stranded wire 3 Steel core 4 Steel sleeve 5 Aluminum winding 7 Aluminum sleeve 10 Detecting means 11 Mutual induction coil 12 Phase detection circuit 13 Moving means 14 Judgment circuit a1 : Phase detection output of steel sleeve in aluminum sleeve (normal compression) a2: Phase detection output of steel sleeve in aluminum sleeve (insufficient compression) b1: Phase detection output of aluminum stranded wire in aluminum sleeve (normal compression) b 2: phase detection output of the line of aluminum in the aluminum sleeve (compression insufficient) c1: phase detection output of aluminum windings in aluminum sleeve (normal compression) c 2: phase detection output of aluminum windings in aluminum sleeve ( C3: Phase detection output of the aluminum winding position that was forgotten to be wound

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

[Procedure amendment 9]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 10

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yusuke Sato 2-8-8 Hikarimachi, Kokubunji-shi, Tokyo Inside the Railway Technical Research Institute (72) Inventor Goro Yokota 13 1 F-term in Electronics Kyoto Co., Ltd. (reference) 2G053 AA26 AB21 CA03 CB16 CB24

Claims (6)

[Claims] A steel core at each end of a steel core aluminum stranded wire to be connected is exposed by cutting and removing an aluminum stranded wire on an outer periphery, and this steel core is inserted into a steel sleeve by butt insertion. The aluminum core wire is connected by compressing the aluminum sleeve, and the aluminum sleeve is fitted to the outer circumference of the steel sleeve so as to extend to the outer circumference of the aluminum stranded wire on both sides. A method of judging the quality of the connection part of the above, wherein the detection coil of the standard comparison method is moved along a connection part of the steel core aluminum stranded wire to be detected with a predetermined interval, and the output of the detection coil The detection section detects the internal state of the connection section by comparing the detection output obtained by detecting at a predetermined phase with a standard value, and determines the quality of the connection section. Good or bad Constant method. 2. The steel core at each end of a steel core aluminum stranded wire to be connected is exposed by cutting and removing the aluminum stranded wire on the outer periphery, and this steel core is inserted into a steel sleeve by butt insertion. The aluminum core wire is connected by compressing the aluminum sleeve, and the aluminum sleeve is fitted to the outer circumference of the steel sleeve so as to extend to the outer circumference of the aluminum stranded wire on both sides. A device for judging the quality of the connection part of the above, comprising a detection coil of a standard comparison method, and a movement for moving the detection coil along a connection part of a steel core aluminum stranded wire to be detected at a predetermined interval. Means, a detection circuit for detecting the output of the detection coil at a predetermined phase, and detecting the internal state of the connection by comparing the detected output with a standard value,
An apparatus for determining the quality of a connection portion of a steel cored aluminum stranded wire, comprising a determination circuit for determining the quality of a connection portion. 3. A judgment circuit compares a detection output of the detection circuit with a standard value prepared as a value when a wire diameter is normally connected to a steel core aluminum to be inspected,
3. The apparatus according to claim 2, wherein the position of the steel sleeve relative to the aluminum sleeve is measured, and the quality of the position of the steel sleeve relative to the aluminum sleeve is determined. 4. A determination circuit determines a detection output of a detection circuit in a range where an aluminum winding is wound in a gap between an aluminum stranded wire and a steel sleeve in an aluminum sleeve with respect to a steel core aluminum stranded wire diameter to be inspected. 3. The steel core according to claim 2, wherein a determination is made as to whether or not there is an aluminum winding at a connection portion of the steel core aluminum stranded wire, as compared with a standard value prepared as a value when the connection is normal. Apparatus for judging the quality of aluminum stranded wire connection. 5. The steel core at each end of a steel core aluminum stranded wire to be connected is exposed by cutting and removing the aluminum stranded wire on the outer periphery, and this steel core is butt-inserted into a steel sleeve. The aluminum core wire is connected by compressing the aluminum sleeve, and the aluminum sleeve is fitted to the outer circumference of the steel sleeve so as to extend to the outer circumference of the aluminum stranded wire on both sides. A method of judging the quality of the connection part of the method, wherein the detection coil of the standard comparison method, while changing the detection phase, so as to keep a predetermined interval along the connection part of the steel core aluminum stranded wire that is the detection target It is characterized in that it detects whether each part is moved at the phase where the maximum output is obtained and compares the detected output with the standard value to judge the quality of connection failure due to poor compression of the aluminum sleeve. Quality determination method of connection of the line from the steel core aluminum. 6. The steel core at each end of a steel core aluminum stranded wire to be connected is exposed by cutting and removing the aluminum stranded wire on the outer periphery, and this steel core is butt-inserted into a steel sleeve and inserted. The aluminum core wire is connected by compressing the aluminum sleeve, and the aluminum sleeve is fitted to the outer circumference of the steel sleeve so as to extend to the outer circumference of the aluminum stranded wire on both sides. A device for judging the quality of the connection part of the above, comprising a detection coil of a standard comparison method, and a movement for moving the detection coil along a connection part of a steel core aluminum stranded wire to be detected at a predetermined interval. Means, a detection circuit that detects the phase of the output of the detection coil while changing the detection phase, measures the phase at which the maximum output of each part is obtained, compares this phase with a standard value, and determines whether the phase difference Diagnosis device of the connection portion of the steel core aluminum stranded wires, characterized by comprising a determination circuit that performs failure of quality determination connection by compression failure of the aluminum sleeve.