JPH1164422A - Power receiving distributing machine having inner conductor contact monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor the contact state constantly by disposing an insufficient contact detector easily at a joint. SOLUTION: An inner conductor contact monitor 18 comprises a monitor 16, and an insufficient contact detector 14 having a shape-memory needle. The insufficient contact detector 14 is disposed at a joint 7 and comprises a base being fixed to a copper plate 6, and a shape memory needle to be set on the base. The shape-memory needle is made of a shape-memory material deformable at a set temperature. The shape-memory needle comes into contact with the copper plate 6 before deformation but when heat is generated due to insufficient contact, it is deformed and a partial discharge takes place at the forward end thereof. A power receiving/distributing machine 1 comprises the insufficient contact detector 14 employing shape-memory material deformable at a set temperature, and a partial discharge measuring unit 9 for detecting a current discharged to the frame 15 of power receiving/distributing machine, and a contact state monitor 16. According to the arrangement, contact state can be monitored constantly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution device having an internal conductor contact monitoring device.

[0002]

2. Description of the Related Art FIG. FIG. 5 shows a conventional internal conductor contact diagnosis device of a power receiving and distribution device. The conventional power receiving and distribution device 100 includes a current detector 2 that detects a current flowing through a copper plate 6, a voltage detector 3 that detects a voltage, a circuit breaker 4 that performs overcurrent protection, a disconnector 5, and a current that flows. Copper plate 6
And a connection section 7 for connecting a cable 8.

When inspecting the contact between the copper plate 6 of the connecting portion 7 of the conventional power receiving and distribution device 100 and the cable 8, X
X-rays are irradiated from the X-ray device 12 of the X-ray fluoroscopic contact failure diagnosis device 11, and the data obtained by the X-ray irradiation is converted to an X-ray data processing device 1.
3 was performed.

[0004]

The prior art has the following problems. (1) Since the X-ray fluoroscopic contact failure diagnosis device 11 diagnoses using X-rays, the X-ray fluoroscopic contact failure diagnosis device 11 is installed and removed every time a diagnosis is performed, and the contact portion 7 of the power receiving and distribution device 1 is removed.
It took a lot of construction work to shield the area around. (2) Therefore, a high cost was required. An object of the present invention is to provide a device that can solve these problems.

[0005]

[Means for Solving the Problems]

(First Means) A power receiving / distributing device having an internal conductor contact monitoring device according to the present invention includes: (A) a current detector 2 for detecting a current flowing through a copper plate 6 and a voltage applied to the power receiving / distributing device 1 Voltage measuring device 3 to perform, and circuit breaker 4 to perform overcurrent protection
A disconnector 5, a connection portion 7 for connecting the copper plate 6 and the cable 8, and a partially discharged current of the power receiving / distributing device to the power receiving / distributing device frame 1.
5, a ground wire 10 flowing to the ground through the ground wire 5, a partial discharge measuring device 9 for detecting a current flowing through the ground wire 10, and an internal conductor contact monitoring device 18. (B) The internal conductor contact monitoring device 18 It comprises a monitoring device 16 and a contact failure detector 14 having a shape memory needle 17. (C) The monitoring device 16 includes a partial discharge threshold value creating device 20,
It comprises a comparator 21, a partial discharge display device 22, an abnormal signal output device 23, and a data trend display device 24. The output signal 19 of the partial discharge measuring device 9 is input to the comparator 21,
The threshold value is compared with the threshold value input from the partial discharge threshold value creating device 20, and if it is equal to or greater than the partial discharge threshold value, it is displayed on the partial discharge display device 22 and output from the abnormal signal output device 23 as an abnormal signal. Cut off by circuit breaker 4,
(D) The poor contact detector 14 includes a pedestal 30 attached to the copper plate 6 and a shape memory needle 17 installed on the pedestal 30. (E) The shape memory needle 17 has a shape that changes according to a set temperature. It is formed using a memory material and is bent to the copper plate 6 before deformation, but is deformed when heat is generated due to poor contact, and a partial discharge is generated from the tip.

That is, the power receiving / distributing device having the internal conductor contact monitoring device of the present invention is provided with the power receiving / distributing device frame 1 by the poor contact detector 14 using the shape memory material which changes according to the set temperature.
The current discharged to 5 is detected by the partial discharge measuring device 9 and the monitoring state is monitored by the monitoring device 16.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
4 to FIG. FIG. 1 is a configuration diagram of an internal conductor contact monitoring device of a power receiving and distribution device of the present invention.

FIG. 2 is a configuration diagram of a contact failure detector of the apparatus of the present invention. FIG. 3 is an explanatory view of the operation of the contact failure detector of the device of the present invention. FIG. 4 is a configuration diagram of the monitoring device of the device of the present invention.

As shown in FIG. 1, a power receiving and distribution device 1 includes a current detector 2 for detecting a current flowing through a copper plate 6, a voltage measuring device 3 for measuring a voltage applied to the power receiving and distribution device, and an overcurrent protection device. Circuit breaker 4, disconnecting switch 5, copper plate 6, connecting portion 7 for connecting cable 8, and ground wire 10 through which the partially discharged current of the power receiving / distributing device flows to the ground through the power receiving / distributing device frame.
And a partial discharge measuring device 9 for detecting a current flowing through a ground line.
And an internal conductor contact monitoring device 18.

The internal conductor contact monitoring device 18 includes the monitoring device 1
6 and a poor contact detector 14 having a shape memory needle 17
It consists of. The poor contact detector 14 is shown in FIGS.
As shown in FIG. 3, the pedestal 30 includes a pedestal 30 attached to the copper plate 6 and a shape memory needle 17 installed on the pedestal 30.

The shape memory needle 17 is refracted by the copper plate 6 before deformation, but deforms when contact failure occurs and heat is generated, causing partial discharge from the tip. Shape memory needle 17
Is a shape memory alloy. The working temperature is, for example, processed and manufactured so that the transformation changes at 100 ° C.

As shown in FIG. 4, the monitoring device 16 comprises a partial discharge detection threshold value creating device 20, a comparator 21, a partial discharge display device 22, an abnormal signal output device, and a data trend display device. Output signal 19 of partial discharge measuring instrument 9
Is input to the comparator 21 and the partial discharge threshold value creation device 20
If the threshold value is equal to or greater than the partial discharge threshold value, "partial discharge is present" is displayed on the partial discharge display device 22. Then, as an abnormal signal, the abnormal signal output device 2
3 and is interrupted by the circuit breaker 4.

Therefore, the operation is as follows. FIG.
The state of the poor contact detector 14 in (A) is a case where the contact state is good, and the shape memory needle 17 is in contact with the connection portion 7.

In this state, the monitoring device 16 does not generate a discharge in the power receiving / distributing device frame 15, so that the current detected by the partial discharge measuring device 9 is input to the monitoring device 16 and diagnosed as normal.

FIG. 3B shows the state of the contact failure device 14 when the cable 8 has a contact failure at the connection portion 7. At this time, heat is generated at the connection portion 7, and the shape memory needle 17 of the poor contact detector 14 made of a shape memory material whose shape changes at or above the set temperature extends toward the power receiving / distributing device frame 15.

The shape memory needle 17 and the power receiving / distributing device frame 1
A discharge 19 occurs between the five. By this discharge 19, the current of the discharge 19 detected by the partial discharge measuring instrument 9 through the power receiving / distributing equipment frame 15 and the ground wire 10 is input to the monitoring device 16, and the current of the discharge 19 is diagnosed in the monitoring device 16. It is determined that the internal conductor is in poor contact.

[0017]

Since the present invention is configured as described above, it has the following effects. (1) According to the device of the present invention, the contact failure detector 14 is easily
Can be installed in the connection part 7, and the contact state can be constantly monitored. (2) At the same time, costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a contact failure detector of the device according to the first embodiment of the present invention.

FIG. 3 is an operation explanatory view of a contact failure detector of the device according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of a monitoring device of the device according to the first embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional internal conductor contact diagnosis device of a power receiving and distribution device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Power receiving and distribution equipment 2 ... Current detector 3 ... Voltage detector 4 ... Circuit breaker 5 ... Disconnector 6 ... Copper plate 7 ... Connection part 8 ... Cable 9 ... Partial discharge measuring instrument 10 ... Ground wire 11 ... X-ray fluoroscopic contact failure Diagnostic device 12 X-ray device 13 X-ray data processing device 14 Contact failure detector 15 Power receiving and distribution equipment frame 16 Monitoring device 17 Shape memory needle 18 Internal conductor contact monitoring device 19 Output of partial discharge measuring device Signal 20: Partial discharge threshold creating device 21: Comparator 22: Partial discharge display device 23: Abnormal signal output device 24: Data trend display device 30: Base 100: Power receiving and distribution device

Claims (1)

[Claims] (A) A current detector (2) for detecting a current flowing through a copper plate (6), a voltage measuring device (3) for measuring a voltage applied to a power receiving and distributing device (1), and an overcurrent A circuit breaker (4) for protection, a disconnector (5), a connection part (7) for connecting a copper plate (6) and a cable (8), and a partially discharged current of the power receiving / distributing device, the power receiving / distributing device frame ( 15) a ground wire (10) flowing to the ground through the ground wire (15), a partial discharge measuring device (9) for detecting a current flowing through the ground wire (10), and an internal conductor contact monitoring device (18); The internal conductor contact monitoring device (18) includes a monitoring device (16) and a poor contact detector (14) including a shape memory needle (17). (C) The monitoring device (16) A partial discharge threshold value creating device (20), a comparator (21), and a partial discharge display device (22); An abnormal signal output device (23) and a data trend display device (24). The output signal (19) of the partial discharge measuring device (9) is input to the comparator (21), and the partial discharge threshold value generating device ( Compared with the threshold value inputted from 20), if it is equal to or greater than the partial discharge threshold value, it is displayed on the partial discharge display device (22), and is output from the abnormal signal output device (23) as an abnormal signal to the circuit breaker. (D) cut off, (D) said contact failure detector (1)
4) is composed of a pedestal (30) attached to the copper plate (6), and a shape memory needle (17) installed on the pedestal (30). (E) The shape memory needle (17) is set according to a set temperature. It is made using a shape memory material that changes, and is deformed by the copper plate (6) before deformation, but deforms when heat is generated due to poor contact, causing partial discharge from the tip. Power distribution equipment having an internal conductor contact monitoring device.