CN203838228U - A spherical voltage sensor - Google Patents

Abstract

The utility model provides a spherical voltage sensor, which includes a detachable flexible conductive ball, a bearing, a connecting frame, a fixing piece and a metal connecting piece, wherein the bearing is electrically connected to the connecting frame after passing through the flexible conductive ball, and the metal connecting piece One end is electrically connected to the connecting frame through a fixing piece; when the detachable flexible conductive ball is squeezed, its shape will change accordingly; when the detachable flexible conductive ball is squeezed, the resistance of the ball sensor remains at Within the resistance range of 0.1 to 50 ohms. The utility model can solve the problem that the fault point cannot be accurately located in the test of the ground potential of the handbag insulation of the existing generator.

Description

A spherical voltage sensor

technical field

The utility model relates to the field of electrical technology, in particular to a spherical voltage sensor.

Background technique

The generator is one of the important equipment in the power grid, and its safe operation is related to the safety of the whole power grid. The insulation of the handbag of the generator needs to be tested to the ground potential. The existing potential shift test technology is an insulation test method to detect the insulation defects of the handbag, by testing the compactness and relative insulation strength of the handbag insulation at the end. It can make up for the lack of terminal insulation defects that cannot be found in the AC and DC withstand voltage tests of the equipment; it can find poor insulation of the lead wire package, defects in the insulation wrapping of the coil nose, insufficient filling of the insulating box filling mud, poor curing of the binding polyester glass rope and terminal Defects such as penetration and other defects caused by poor welding quality of stator hollow copper wires at the internal joints. But the existing test method can't accurately locate the fault point.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a spherical voltage sensor, which is used to solve the problem that the failure point cannot be accurately located in the existing electric generator handbag insulation-to-ground potential test.

In order to achieve the above object, the utility model is realized through the following technical solutions:

A spherical voltage sensor includes a detachable flexible conductive ball, a bearing, a connecting frame, a fixing piece and a metal connecting piece, wherein the bearing is electrically connected to the connecting frame after passing through the flexible conductive ball, and one end of the metal connecting piece is connected to the connecting frame through the fixing piece. Connecting the frame for electrical connection;

When the detachable flexible conductive ball is squeezed, its shape will change accordingly;

When the detachable flexible conductive ball is squeezed, the resistance of the ball sensor remains within the resistance value range of 0.1-50 ohms.

Wherein, the other end of the metal connecting piece is connected with other external devices through threads and bolts.

Wherein, the diameter of the flexible conductive ball is in the range of 1 cm to 10 cm.

The utility model has at least the following beneficial effects:

The spherical voltage sensor described in the utility model can form a ground potential detection device together with a high-voltage insulating support rod, a standard resistor, and an ammeter, and is used to insulate the end of the generator stator handbag, including the insulation end of the stator coil handbag and the high-voltage output terminal. Handbag insulation, neutral terminal handbag insulation, accurate location of fault points. The shape of the spherical voltage sensor described in the utility model changes correspondingly as it is squeezed, which can meet the requirement of accurately locating the fault point of the insulation end of the generator stator handbag under different test environments.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present utility model. Those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a schematic structural diagram of a spherical voltage sensor in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the structure of the generator stator handbag insulation end-to-ground potential detection device in the embodiment of the utility model;

Fig. 3 is a schematic diagram of detecting the ground potential of the generator stator handbag insulation end in the embodiment of the utility model;

In Fig. 1, a detachable flexible conductive ball 1, a bearing 2, a connecting frame 3, a fixing piece 4, a metal connecting piece 5 and a threaded hole 6;

In Fig. 2, a spherical voltage sensor 1, a connecting conductor 2, a high-voltage insulating support rod 3, a standard resistor 4, a voltage measurement display device 5 and a grounding system 6;

In Fig. 3, handbag insulation resistance 1, standard resistance 2, mA meter 3, sounding device 4 and grounding system 5.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Fig. 1, the embodiment of the utility model proposes a spherical voltage sensor, including a detachable flexible conductive ball 1, a bearing 2, a connecting frame 3, a fixing part 4 and a metal connecting part 5, wherein the bearing 2 passes through the flexible conductive The ball 1 is electrically connected to the connecting frame 3, and one end of the metal connecting piece 5 is electrically connected to the connecting frame 3 through the fixing piece 4;

Wherein, the flexible conductive ball is made of a flexible conductive material, and the material satisfies the following conditions: first, the resistance value is small. Compared with the resistance value of the standard resistance, the resistance value of the voltage sensor made of this material is very small, almost Negligible, the second property is variable, when it is squeezed by external force, its shape can change accordingly to adapt to the detection under different space conditions, and the resistance value will not change too much, generally can be kept within a certain resistance value range Inside.

When the detachable flexible conductive ball is squeezed, the resistance of the ball sensor remains within the resistance value range of 0.1-50 ohms, so the test result of the ground potential will not be affected. This range of resistance makes it easier to manufacture the flexible conductive plate and lowers the requirements for materials.

Wherein, the other end of the metal connecting piece is connected with other external devices through threads and bolts.

Wherein, the diameter of the detachable flexible conductive ball is in the range of 1 cm to 10 cm.

This range of diameter can meet the requirement that the space between the hand-wrap insulation at the end of different generators is different, but the sensor only measures the specified hand-wrap insulation during measurement without connecting the hand-wrap insulation in series. At the same time, this range can meet the requirements of different generator end hand-wrap insulation Measurement requirements and measurement range requirements for different shapes.

In an actual test, according to test requirements, the parameters of the spherical voltage sensor can be flexibly adjusted, for example, its diameter can be changed as needed to meet the requirements of different test environments. For example, to accurately determine the fault point, it is necessary to continuously change its diameter to make its contact range smaller, so as to obtain a more accurate fault point location.

The conductive ball in the spherical voltage sensor is made of flexible material, which can meet the needs of different test environments. This demand, because it will change accordingly with the extrusion of external force.

The spherical voltage sensor described in the embodiment of the utility model can form a ground potential detection device together with a high-voltage insulating support rod, a standard resistor, and an ammeter, and is used to insulate the end of the hand wrap of the stator of the generator, including the end of the hand wrap of the stator coil, The high-voltage output terminal is insulated with a handbag, and the neutral terminal is insulated with a handbag to accurately locate the fault point. Refer to Fig. 2 for details. Fig. 2 is a ground potential detection device composed of a spherical voltage sensor, including: a spherical voltage sensor 1, a metal connecting conductor 2, a high-voltage insulating support rod 3, a standard resistor 4, a voltage measurement display device 5 and a grounding system 6.

The principle diagram of using the above-mentioned device to accurately locate the fault point at the insulation end of the generator stator handbag is shown in Figure 3, the handbag insulation resistance 1, the standard resistance 2, the mA meter 3, the sounding device 4 and the grounding system 5. The handbag insulation resistance is the equivalent resistance of the handbag insulation of the generator stator. If the handbag insulation is good, its resistance value is much greater than the standard resistance; if the handbag insulation breaks down or is defective, its resistance value drops by the same order of magnitude as the standard resistance or even far less than the standard resistance. According to the deflection of the pointer of the mA meter and whether the generating device makes a sound, it can be judged whether the insulation of the generator stator handbag is good. Since the contact point between the spherical voltage sensor and the insulation of the generator stator handbag is formed, the fault point can be accurately located by using the ground potential measuring device installed with the spherical voltage sensor.

The spherical voltage sensor described in the utility model can form a ground potential detection device together with a high-voltage insulating support rod, a standard resistor, and an ammeter, and is used to insulate the end of the generator stator handbag, including the insulation end of the stator coil handbag and the high-voltage output terminal. Handbag insulation, neutral terminal handbag insulation, accurate location of fault points. The shape of the spherical voltage sensor described in the utility model changes correspondingly as it is squeezed, which can meet the requirement of accurately locating the fault point of the insulation end of the generator stator handbag under different test environments.

The above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be applied to the foregoing implementations. The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (3)

1. a spherical voltage sensor, it is characterized in that, comprise removable compliant conductive ball, bearing, connecting frame, fixture and metal connecting piece, wherein, bearing is electrically connected with connecting frame through after compliant conductive ball, and one end of metal connecting piece is electrically connected with connecting frame by fixture;

When described removable compliant conductive ball is squeezed, can there is respective change in its shape;

In the time that described removable compliant conductive ball is squeezed, the resistance of spherical sensor remains in the Standard resistance range in 0.1～50 Europe.

2. spherical voltage sensor according to claim 1, is characterized in that, the other end of described metal connecting piece utilizes bolt to be connected with outside other devices by screw thread.

3. spherical voltage sensor according to claim 1, is characterized in that, the diameter of described removable compliant conductive ball is within the scope of 1cm～10cm.