Switch cabinet primary plug-in three-phase contact temperature monitoring device

Abstract

The application discloses a kind of switchgear primary plug-in three-phase contact temperature monitoring devices, including shell and the three-phase contact unit being arranged in shell, each phase contact unit includes contact and the first contact piece, second contact piece and temperature monitoring unit being connected in the one end of contact, temperature monitoring unit includes temperature measuring probe being connected on the one end of contact, temperature acquisition and emission circuit being connected with temperature measuring probe, power supply unit for temperature acquisition and emission circuit, protective shell, temperature acquisition and emission circuit, power supply unit are arranged in protective shell.The temperature measuring probe of the application is embedded at contact point, close to heat spot to make heat transfer loss minimum, transmission response speed fastest.Temperature acquisition and emission circuit are installed in independent protective shell, then prepositioned in the inside of primary plug-in, ensure that A, B, C three-phase phase and phase are independent of each other, there is no lead wire between phase and phase, do not affect the insulation and withstand voltage requirement of original plug-in.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch cabinet, in particular to a switch cabinet primary plug-in three-phase contact temperature monitoring device. BACKGROUND

[0002] The primary plug-in is a commonly used product of the switch cabinet, but in the process of use, the contact resistance becomes large due to excessive load or poor contact of the contact point, which causes heating and burning, and is one of the common faults of the switch cabinet. Therefore, real-time monitoring of the temperature of each phase A, B and C in the primary plug-in can avoid loss or failure caused by heating without taking measures. The current temperature monitoring method of the primary plug-in of the switch cabinet mainly has the following two kinds:

[0003] 1. The three temperature measurement elements of the primary plug-in are installed outside the plug-in, and the heating part of the primary plug-in is the connection part of the moving contact and the static contact inside the plug-in. The measured part is far away from the real heating point (more than 60mm), and the temperature of the plug-in inside and the heating point is transmitted to the temperature measurement element of the collection part through the busbar of the primary plug-in. This method has a delay and heat loss, so the actual temperature of the heating part cannot be obtained in time and accurately.

[0004] 2. The three thermistors used for temperature collection of the A, B and C three phases of the primary plug-in are pre-buried at the heating points of each phase, and the signal processor is installed outside the plug-in. The thermistor and the signal processor are connected through a wire. Although this method can collect the temperature inside the plug-in, the thermistors installed in each phase A, B and C are connected to the same signal processor through a lead wire. If the element is damp, the signal processor is damaged, etc., it is one of the hidden dangers affecting the safety of the switch cabinet, and the workload of wiring is additionally increased. SUMMARY

[0005] The present application aims at the above-mentioned deficiencies and defects of the prior art, and provides a switch cabinet primary plug-in three-phase contact temperature monitoring device to solve the above-mentioned problems.

[0006] The technical problem solved by the present application can be realized by the following technical scheme:

[0007] The switch cabinet primary plug-in three-phase contact temperature monitoring device comprises an outer shell and three-phase contact units arranged in the outer shell. Each phase contact unit comprises a contact, a first contact piece and a second contact piece connected to one end of the contact, and a temperature monitoring unit. The temperature monitoring unit comprises a temperature measurement probe connected to one end of the contact, a temperature collection and emission circuit connected to the temperature measurement probe, a power supply unit for supplying power to the temperature collection and emission circuit, and a protective shell. The temperature collection and emission circuit and the power supply unit are arranged in the protective shell.

[0008] In a preferred embodiment of the present application, the temperature measuring probe comprises a thermistor.

[0009] In a preferred embodiment of the present application, the power supply unit comprises an electromagnetic induction power supply component.

[0010] In a preferred embodiment of the present application, the electromagnetic induction power supply component comprises a magnetic ring wound around the contact, and an iron core and a coil matched with the magnetic ring.

[0011] In a preferred embodiment of the present application, the magnetic ring is made of a new type of nanocrystalline magnetic material.

[0012] In a preferred embodiment of the present application, the magnetic ring is made of an iron-based microcrystalline material.

[0013] In a preferred embodiment of the present application, the protective shell comprises a first half shell and a second half shell respectively covering two sides of each phase contact unit, and the first half shell and the second half shell are connected by a screw passing through the contact.

[0014] As the above technical solution is adopted, the temperature measuring probe of the present application is embedded at the contact point, close to the heat generating point to minimize the heat transfer loss and maximize the response speed. The temperature collection and transmission circuit is installed in an independent protective shell and pre-installed inside the primary plug-in, ensuring that the A, B and C phases are independent of each other, and there is no lead wire between the phases, which does not affect the insulation and voltage withstand requirements of the original plug-in. In addition, since the temperature measuring probe and the temperature collection and transmission circuit are pre-installed inside the primary plug-in, the power supply cannot use a battery, otherwise the user cannot replace the battery, so the present application uses the principle of electromagnetic induction to obtain the power of the internal power supply. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 is a structural schematic diagram of an embodiment of the present application (with a partial section).

[0017] Figure 2 is a structural schematic diagram of a phase contact unit of an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the present application will be further described below.

[0019] Referring to Figure 1 and Figure 2 The switch cabinet primary plug-in three-phase contact temperature monitoring device shown in the figure comprises an outer shell 100 and three-phase contact units arranged in the outer shell 100. Each phase contact unit 200 comprises a contact 210 and a first contact sheet 221, a second contact sheet 222 and a temperature monitoring unit 230 connected to one end of the contact 210. The temperature monitoring unit 230 comprises a temperature measuring probe 231, a temperature acquisition and emission circuit 232, a power supply unit 233 and a protective shell 234. The temperature measuring probe 231 comprises a thermistor. The temperature measuring probe 231 is connected to one end of the contact 210. The temperature acquisition and emission circuit 232 is connected to the temperature measuring probe 231 and can convert the detection signal of the temperature measuring probe 231 into other signals and wirelessly connect to external monitoring equipment. The power supply unit 233 supplies power to the temperature acquisition and emission circuit 232. The temperature acquisition and emission circuit 232 and the power supply unit 233 are arranged in the protective shell 234. The protective shell 234 in the embodiment comprises a first half shell 234a and a second half shell 234b respectively covering both sides of each phase contact unit. The first half shell 234a and the second half shell 234b are connected by a screw 240 passing through the contact 210. The protective shell 234 can fix the temperature acquisition and emission circuit 232 and the temperature measuring probe 231 to ensure that the drawer is not affected by impact during the in-out operation. In addition, the protective shell 234 can also ensure the safety between phases.

[0020] The power supply unit 233 in the embodiment comprises an electromagnetic induction power supply component, which comprises a magnetic ring 233a wound around the contact 210 and an iron core and a coil 233b matched with the magnetic ring 233a. The magnetic ring 233a is made of a new type of nanocrystalline magnetic material to obtain a larger initial magnetic permeability. The magnetic ring 233a in the embodiment is made of an iron-based microcrystalline material. The present application can obtain relatively more induced power by reasonably configuring the cross-sectional area of the iron core, the number of turns of the secondary winding and other parameters. It solves the problem of obtaining sufficient power under small current and provides a discharge channel under large current (such as short-circuit current).

[0021] The basic principles and main features of the present application and the advantages of the present application have been shown and described. It should be understood by those skilled in the art that the present application is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A switch cabinet primary plug-in three-phase contact temperature monitoring device, comprising an outer shell and a three-phase contact unit arranged in the outer shell, characterized in that, Each phase contact unit comprises a contact and a first contact sheet, a second contact sheet and a temperature monitoring unit connected at one end of the contact, the temperature monitoring unit comprising a temperature measuring probe connected at one end of the contact, a temperature acquisition and transmission circuit connected with the temperature measuring probe, a power supply unit for supplying power to the temperature acquisition and transmission circuit, and a protective shell, the temperature acquisition and transmission circuit and the power supply unit being arranged in the protective shell; The temperature measuring probe comprises a thermistor. The power supply unit comprises an electromagnetic induction power supply component. The electromagnetic induction power supply component comprises a magnetic ring wound around the contact and an iron core and a coil cooperating with the magnetic ring. The protective shell comprises a first half shell and a second half shell respectively covering two sides of each phase contact unit, and the first half shell and the second half shell are connected by a screw passing through the contact.

2. The switchgear primary insert three-phase contact temperature monitoring device of claim 1, wherein, The magnetic ring is made of a new type of nano product magnetic material.

3. The switchgear primary insert three-phase contact temperature monitoring device of claim 2, wherein, The magnetic ring is made of an iron-based microcrystalline material.

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