Testing device for radio interference test of high-voltage electrical equipment

Abstract

The utility model discloses a test device for radio interference test of high-voltage electrical equipment, which comprises two drum-shaped voltage-sharing mechanisms with the same structure, the two voltage-sharing mechanisms are connected through four long connecting rods, a four-split spacer is mounted in the middle of each long connecting rod, and a test object is mounted on the four-split spacer; each pressure equalizing mechanism comprises a plurality of concentric metal rings, the inner walls of the rings are welded to the supporting rings, the diameter of the middle ring is the largest, and the diameters of the rings symmetrically arranged on the front side and the rear side of the middle ring are gradually decreased. According to the utility model, the two symmetrically arranged drum-shaped voltage-sharing mechanisms are connected through the long connecting rod, and a test object is installed on the voltage-sharing device or is connected in series with the voltage-sharing device, so that a voltage-sharing protection effect on unbalanced voltage possibly generated at two ends of a test loop in a radio interference test of high-voltage electrical equipment is achieved; and the influence on the radio interference measurement result of the test object is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage electrical equipment detection, in particular to a test device for radio interference testing of high-voltage electrical equipment. Background Art

[0002] According to the requirements of the test conditions of clause 4 of the standard GB / T11604-2015 "High Voltage Electrical Equipment Radio Interference Test Method", high voltage electrical test products generate electromagnetic interference with radio frequency components under normal operating voltage. Ideally, the measurement conditions and measurement circuit layout should be as close to the actual operating conditions as possible. The level of radio interference generated by high voltage electrical equipment depends largely on the surface state of the equipment. The test products mainly include high voltage switchgear, mutual inductors, voltage dividers, coupling capacitors, lightning arresters, bushings, insulators, etc. The level of radio interference generated by the test products does not completely depend on the instantaneous value of the test voltage. Sometimes there is a hysteresis effect. Whether the interference occurs at a given voltage depends on whether the voltage rises or falls to a given value. The test product pretreatment by applying a test voltage equal to or greater than the specified test voltage to the test product within a specified time will affect the measurement of the radio interference level.

[0003] It is particularly important to install and arrange the test product in the test circuit in a way that not only meets the requirements of standard test conditions, but also satisfies the layout of insulation tests for similar products and maintains equivalence with the actual conditions during the actual operation of high-voltage electrical equipment. Utility Model Content

[0004] The utility model aims to provide a test device for radio interference testing of high-voltage electrical equipment, which is used to eliminate factors that may affect the electric field distribution on the surface of the test product and facilitates the installation of the test product to be connected to the test circuit.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A test device for radio interference testing of high-voltage electrical equipment comprises two drum-shaped equalizing mechanisms of identical structure, the two equalizing mechanisms being connected by four long connecting rods, a four-split spacer bar being installed in the middle of the long connecting rod, and a test piece being installed on the four-split spacer bar; each equalizing mechanism comprises several concentric metal rings, the inner walls of the rings are welded to several supporting rings, the middle ring has the largest diameter, and the diameters of the rings symmetrically arranged on the front and rear sides of the middle ring gradually decrease.

[0007] Preferably, a plurality of brackets are installed on the long connecting rod.

[0008] Preferably, a circular or elliptical specimen mounting hole is provided on the four-split spacer bar.

[0009] When the utility model is used, the test device needs to be hoisted in the air and connected to the test circuit to form insulation to the ground. Smaller test pieces such as insulators and lightning arresters can be directly installed on the four-split spacer rods, and larger test pieces can be connected in series with the test device and connected to the test circuit to conduct radio interference tests on high-voltage electrical equipment.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] The utility model connects two symmetrically arranged drum-shaped voltage-equalizing mechanisms through a long connecting rod. A test sample is mounted on the utility model or connected in series with the utility model, which plays a voltage-equalizing protection role for the unbalanced voltage that may be generated at both ends of the test circuit in the radio interference test of high-voltage electrical equipment, thereby reducing the influence on the radio interference measurement result of the test sample.

[0012] The voltage equalizing mechanism in the utility model is composed of a plurality of concentric metal rings without any sharp corners, and will not produce the phenomenon of tip discharge. At the same time, it also plays an arc-starting role, thereby avoiding the influence of the high-voltage arc on the radio interference measurement result.

[0013] In the utility model, the four-split spacer rod installed in the middle of the long connecting rod is made of aluminum alloy and is provided with round or elliptical holes, which is convenient for installing test pieces such as insulators and lightning arresters, thereby improving the detection time efficiency.

[0014] The utility model installs a plurality of brackets in the middle of the long connecting rod, which can prevent the long connecting rod from deflecting downward after the utility model is hoisted, thereby affecting the measurement result of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a test circuit schematic diagram of the utility model and the test product.

[0017] In the figure: 1. pressure equalizing mechanism, 2. long connecting rod, 3. four-split spacer rod, 4. circular ring, 5. supporting ring, 6. bracket. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1A test device for radio interference testing of high-voltage electrical equipment is shown, comprising two drum-shaped voltage-equalizing mechanisms 1 of identical structure, the two voltage-equalizing mechanisms 1 being connected by four long connecting rods 2, a four-split spacer 3 being installed in the middle of the long connecting rods 2, and the test sample being installed on the four-split spacer 3; each voltage-equalizing mechanism 1 comprises several concentric metal rings 4, the inner walls of the rings 4 are welded to several support rings 5, the middle ring 4 has the largest diameter, and the diameters of the rings 4 symmetrically arranged on the front and rear sides of the middle ring 4 gradually decrease.

[0020] Several brackets 6 are installed on the long connecting rod 2.

[0021] A circular or elliptical specimen mounting hole is provided on the four-split spacer bar 3 .

[0022] When the utility model is used, the test device needs to be hoisted in the air and connected to the test circuit to form insulation to the ground. Smaller test pieces such as insulators and lightning arresters can be directly installed on the four-split spacer rod 3, and larger test pieces are connected in series with the test device and connected to the test circuit to perform radio interference tests on high-voltage electrical equipment.

[0023] The utility model connects two symmetrically arranged drum-shaped voltage-equalizing mechanisms through a long connecting rod. A test sample is mounted on the utility model or connected in series with the utility model, which plays a voltage-equalizing protection role for the unbalanced voltage that may be generated at both ends of the test circuit in the radio interference test of high-voltage electrical equipment, thereby reducing the influence on the radio interference measurement result of the test sample.

[0024] The above are only preferred examples of the present invention. It should be noted that for ordinary technicians in this field, under the technical enlightenment provided by the present invention, other equivalent deformations and improvements can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A test device for radio interference testing of high voltage electrical equipment, Features: The invention comprises two drum-shaped pressure equalizing mechanisms (1) of the same structure, the two pressure equalizing mechanisms (1) being connected via four long connecting rods (2), a four-split spacer (3) being installed in the middle of the long connecting rod (2), and the test piece being installed on the four-split spacer (3); each pressure equalizing mechanism (1) comprises a plurality of concentric metal rings (4), the inner walls of the rings (4) being welded to a plurality of support rings (5), the diameter of the middle ring (4) being the largest, and the diameters of the rings (4) symmetrically arranged on the front and rear sides of the middle ring (4) gradually decreasing.

2. A test device for radio interference testing of high-voltage electrical equipment according to claim 1, Features: A plurality of brackets (6) are mounted on the long connecting rod (2).

3. A test device for radio interference testing of high-voltage electrical equipment according to claim 1, Features: The four-split spacer bar (3) is provided with a circular or elliptical specimen mounting hole.

Images