CN102621415A - Electrical fast transient (EFT) disturbance experimental system - Google Patents

Abstract

The invention discloses an electrical fast transient burst disturbance experiment system, which comprises a rectangular reference ground plate, an insulating table with a height of 0.8 meters placed on the reference ground plate, and a signal generator placed on the insulating table and connected in sequence , the coupling/decoupling network and the device under test, wherein: the lengths of several signal cables connecting the coupling/decoupling network and the device under test are all less than 1 meter; the desktop of the insulating table is rectangular; the reference ground plate It is an aluminum plate or a copper plate, connected to the ground, and the length of each side exceeds the length of each side of the insulating table by 0.1 meters; the grounding cable of the device under test is connected to the reference grounding plate. The invention can accurately verify the immunity of the tested equipment to various types of transient disturbances such as from the switching transient process.

Description

An Experimental System of Electrical Fast Transient Burst Disturbance

technical field

The invention relates to an electrical fast transient pulse group disturbance experiment system.

Background technique

Electrical Fast Transient/burst (EFT, Electrical Fast Transient/burst) is mainly caused by cutting off inductive loads, relay contact jitter, high-voltage switch switching, etc. This transient disturbance is composed of a large number of pulses. The contacts of the mechanical switch are separated. When the voltage between the contacts exceeds the insulation voltage, the spark discharge begins. The voltage between the contacts drops rapidly and then rises again. Due to the increase in the distance between the contacts, the voltage at which the spark discharge occurs again increases accordingly. analogy. When the distance is large enough, a glow discharge occurs between the contacts, which consumes the energy in the inductor. In order to verify the immunity of electrical and electronic equipment to various types of transient disturbances such as from switching transients, electrical fast transient burst disturbance experiments can be performed on the equipment. Therefore, it is a problem to be solved to develop a system for the experiment of electrical fast transient burst disturbance.

Contents of the invention

The object of the present invention is to overcome the defects of the prior art and provide a kind of electric fast transient burst disturbance experiment system, can do electric fast transient burst disturbance experiment to the equipment under test, accurately verify that the equipment under test is sensitive to such as from switching Immunity to various types of transient disturbances during transients.

The technical scheme for realizing the above-mentioned purpose is:

An electrical fast transient burst disturbance experimental system, the experimental system includes a rectangular reference ground plate, an insulating table with a height of 0.8 meters placed on the reference ground plate, a signal generator placed on the insulating table and connected in sequence , coupling/decoupling network and equipment under test (EUT), where:

The lengths of several signal cables connecting the coupling/decoupling network and the equipment under test are all less than 1 meter;

The desktop of the insulating table is rectangular;

The reference grounding plate is an aluminum plate or a copper plate, which is connected to the ground, and the length of each side exceeds the length of each side of the insulating table by 0.1 meters;

The ground cable of the device under test is connected to the reference ground plane.

In the aforementioned electrical fast transient burst disturbance experimental system, the thickness of the reference ground plate is greater than 0.25 mm.

In the aforementioned electrical fast transient burst disturbance experimental system, the thickness of the reference ground plate is 0.3 mm.

The beneficial effects of the present invention are: the present invention can conduct electrical fast transient burst disturbance experiments on the tested equipment, and accurately verify the immunity of the tested equipment to various types of transient disturbances such as from the switching transient process. At the same time, the present invention has a simple structure and is easy to implement.

Description of drawings

Fig. 1 is a system schematic diagram of the electrical fast transient burst disturbance experimental system of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

Please refer to Fig. 1, the electrical fast transient burst disturbance experimental system of the present invention, described experimental system comprises rectangular reference ground plate 1, height is 0.8 meters and places the insulation table 2 on reference ground plate, places insulation table 2 and the signal generator 3, the coupling/decoupling network 4 and the device under test 5 connected in sequence, wherein:

The lengths of several signal cables connecting the coupling/decoupling network 4 and the device under test 5 are all less than 1 meter;

The desktop of the insulating table 2 is rectangular, and each side of the desktop corresponds to each side of the rectangular reference grounding plate 1;

The reference ground plate 1 is an aluminum plate or a copper plate, and its thickness is greater than 0.25 mm. In this embodiment, the thickness is 0.3 mm; 0.1 m on each side;

The grounding cable connection of the equipment under test 5 refers to the grounding plate 1;

The signal generator 3 sends out EFT signals, that is, electrical fast transient bursts.

In the present invention, the electrical fast transient burst disturbance is applied to all input and output circuits of the device under test 5 in a common mode, as shown in FIG. 1 . In the experiment, when adding from the power line, the equipment under test 5 requires to add EFT signal on only one signal cable at a time, instead of adding on each signal cable at the same time, using coupling/decoupling network 4 to apply EFT Signal. Each signal cable is required to be tested three times under one test voltage polarity, each time for one minute, with an interval of one minute in between. After one polarity is done, switch to the other polarity. After one signal cable is done, change to another signal cable.

In the present invention, the equipment used in different occasions has different specific requirements for the test level of electrical fast pulse transient group immunity, as shown in Table 1:

Table 1

The level of severity to be imposed by the experiment depends on the conditions under which the equipment is used:

Level 1: Better protection of the environment, the surge voltage does not exceed 500V, such as the control room in a factory or power station.

Level 2: The protection environment is slightly worse than Level 1, and the surge voltage does not exceed 1kV, such as factories without strong interference.

Level 3: General electromagnetic disturbance environment, no special installation requirements, surge amplitude not exceeding 2kV, such as ordinary installed cable networks, industrial workplaces and substations, etc.

Level 4: The surge voltage can reach 4kV in the environment subject to serious harassment, such as civil overhead lines, unprotected high-voltage substations, etc.

The above embodiments are only for the purpose of illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent The technical solutions should also belong to the category of the present invention and should be defined by each claim.

Claims (3)

1. An electrical fast transient burst disturbance experimental system is characterized in that, the experimental system comprises a rectangular reference ground plate, a height of 0.8 meters and an insulating table placed on the reference ground plate, placed on the insulating table and A signal generator, a coupling/decoupling network and the device under test connected in sequence, where: The lengths of several signal cables connecting the coupling/decoupling network and the equipment under test are all less than 1 meter; The desktop of the insulating table is rectangular; The reference grounding plate is an aluminum plate or a copper plate, which is connected to the ground, and the length of each side exceeds the length of each side of the insulating table by 0.1 meters; The ground cable of the device under test is connected to the reference ground plane. 2 . The electrical fast transient burst disturbance experimental system according to claim 1 , wherein the thickness of the reference ground plate is greater than 0.25 millimeters. 3 . 3. The electrical fast transient burst disturbance experimental system according to claim 2, wherein the thickness of the reference ground plate is 0.3 millimeters.

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