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Device and method for confirming connection state of antenna and cable

A technology of connection status and confirmation device, applied in the direction of electrical connection test, measurement device, measurement of electricity, etc., can solve the problem of inability to confirm the correct connection of antenna and coaxial cable, etc., and achieve the effect of improving insulation monitoring performance and reliability.

Active Publication Date: 2017-11-07
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the prior art, there is a problem that it is impossible to confirm whether the antenna and the coaxial cable installed in the device are correctly connected in the operating state.

Method used

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  • Device and method for confirming connection state of antenna and cable
  • Device and method for confirming connection state of antenna and cable
  • Device and method for confirming connection state of antenna and cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] Use the following Figure 1 to Figure 3 An example of the device for confirming the connection state of the antenna and the coaxial cable provided in the electric equipment according to Embodiment 1 of the present invention will be described. Such as figure 1 As shown, in the electrical equipment frame 1 (within the equipment of the electrical equipment): an example for measuring the partial discharge from the electrical equipment is a microstrip antenna 2; in the equipment connected with the microstrip antenna 2 Coaxial cable 3a; through terminal 4, the through terminal 4 is installed in the electrical equipment frame (or access hole etc.), connects above-mentioned coaxial cable 3a and the coaxial cable 3b that is positioned at the outside of electronic equipment frame 1; And through coaxial cable 3 And a detector 5 penetrating through the terminal 4 to detect the partial discharge of the electronic equipment received by the microstrip antenna 2 .

[0039] figure 2...

Embodiment approach 2

[0078] In Embodiment 1 above, the following detection method is described: that is, when the microstrip antenna and the coaxial cable have a parallel structure and the respective capacitances are C1 and C2, measure the combined electrostatic capacitance C (unit F: farad), where In this case, if a cable is disconnected or an antenna is disconnected, an abnormality is detected based on a change in the combined electrostatic capacitance C. In this Embodiment 2, the use of Figure 11 The equivalent circuit shown is a method to detect anomalies. That is, in Figure 11 In this process, an AC voltage Ea (unit: V, the same below) of frequency f (unit: Hz, the same below) is applied to the circuit, and a flowing current i (unit: A, the same below) is measured. At this time, if Figure 11 As shown in the equivalent circuit of , the frequency f needs to be low to obtain a lumped constant circuit. If the composite electrostatic capacitance C (unit F) of C1 and C2 is set in this figure...

Embodiment approach 3

[0081] use Figure 12 Embodiment 3 will be described. Such as Figure 12 As shown in (a), Embodiment 3 discloses a method in which a DC voltage E(V) is applied to a circuit instead of the AC voltage Ea(V) in Embodiment 2, and the resistance R (unit: Ω ) are connected to measure the time constant of this circuit, so that abnormalities of cables and antennas can be detected. In this case, when the capacitances of the microstrip antenna and the coaxial cable are C1 and C2, respectively, and the combined electrostatic capacitance C(F), the following mathematical expression (6) holds.

[0082] [mathematical formula 6]

[0083]

[0084] The following formula (7) can be obtained by performing Laplace transform on the formula (6).

[0085] [mathematical formula 7]

[0086]

[0087] Mathematical formula (8) can be obtained by performing inverse Laplace transform on Mathematical formula 7.

[0088] [mathematical formula 8]

[0089]

[0090] According to the above formula...

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Abstract

In insulation monitoring of electrical equipment, etc., an antenna used for partial discharge measurement of electrical equipment is usually installed in the equipment, and signals are transmitted and received through a signal processing device and a coaxial cable outside the equipment. The inside is filled with air, hydrogen gas, SF6 gas, etc. to seal the frame for operation. Therefore, it is not easy to confirm whether the antenna installed in the equipment and the coaxial cable are properly connected during operation. The frame of the electrical equipment is provided with a through terminal for connecting the coaxial cable inside and outside the equipment, and the combined electrostatic capacitance of the antenna and the coaxial cable inside the equipment can be measured from outside the equipment, so as to determine whether the connection of the antenna installed in the electrical equipment is at any time. appropriate.

Description

technical field [0001] The present invention relates to a device for confirming the connection state of the antenna and the cable outside the electrical equipment when an antenna for receiving partial discharge of the electrical equipment and a cable for transmitting and receiving signals are installed in the electrical equipment, And a method for confirming the connection state of the electrical equipment on the outside of the electrical equipment using the device. Background technique [0002] Antennas for measuring partial discharge of electrical equipment are usually installed inside the equipment of the electrical equipment, that is, inside the frame (inside the frame), and transmit and receive signals with a signal processing device installed outside the equipment through a coaxial cable. In this case, air, hydrogen gas, SF6 gas, etc. are often filled into the equipment for the purpose of cooling, insulation, sound insulation, etc., and the frame is sealed for operatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
CPCG01R35/00G01R31/1254G01R27/2605G01R31/69
Inventor 佐古浩
Owner MITSUBISHI ELECTRIC CORP