A device for collecting and detecting ion current and discharge current during aging and testing

Abstract

The present invention provides a device for collecting and detecting ion current and discharge current during high-voltage aging and testing, comprising: an ion current and discharge current signal sensor; and a signal collection, amplification, and processing device. The ion current and discharge current signal sensor is connected to the center end and ground end of the base of each working cylinder position of the high-voltage aging process. The ion current and discharge current signal sensor collects the current value and ion current of the product discharged during the aging and testing process in real time, separates the high-frequency discharge signal and the low-frequency emission current signal from the aging discharge current, and calculates the emission current and number of discharges generated by the product during the high-voltage aging process from the high-frequency discharge signal and the low-frequency emission current signal. The signal collection, amplification, and processing device calculates the vacuum degree during the testing process from the ion current. The present invention also provides high-voltage aging equipment, which improves the high-voltage aging effect of the vacuum interrupter, enables electrical performance determination, and simplifies the production process.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum arc extinguishing chamber manufacturing, in particular to high-voltage aging. Background Art

[0002] Vacuum interrupters are core components of high-voltage vacuum switches. High-voltage aging is a crucial process in their production, improving their electrical performance. Existing high-voltage aging processes and equipment for vacuum interrupters consist of only a few aging steps with gradually increasing voltages and a conventional low-frequency, low-current transformer to collect the product's high-voltage leakage current signal. During actual product aging, the high-frequency discharge current signal generated during aging cannot be accurately detected. Consequently, it is impossible to accurately control and determine the proper vacuum performance of the product before aging, or to control and determine the actual aging effect. This can result in inadequate aging effects, which are only reflected in subsequent conventional insulation performance testing. This results in poor aging results, low quality accuracy, and complex and inefficient subsequent electrical performance and vacuum level testing. Summary of the Invention

[0003] The main technical problem to be solved by the present invention is to provide an ion current and discharge current collection and detection device during high-voltage aging and testing. When the product generates spark discharge and flashover during high-voltage aging, the emission current value and discharge number of the product are collected in real time.

[0004] In order to solve the above technical problems, the present invention provides an ion current and discharge current collection and detection device during high-voltage aging and testing, comprising: an ion current and discharge current signal sensor, a signal collection, amplification, and processing device;

[0005] The ion current and discharge current signal sensors are connected to the center end and ground end of the base of each working cylinder position of the high-voltage aging refining machine; the ion current and discharge current signal sensors collect the current value and ion current discharged by the product during the aging and testing process in real time, and separate the high-frequency discharge signal and the low-frequency emission current signal from the aging discharge current, and send the high-frequency discharge signal, the low-frequency emission current signal and the ion current signal to the signal acquisition, amplification and processing device;

[0006] The signal acquisition, amplification and processing device calculates the emission current and discharge times generated by the product during the high-voltage aging process through high-frequency discharge signals and low-frequency emission current signals; the signal acquisition, amplification and processing device calculates the vacuum degree of the test process through ion current.

[0007] In a preferred embodiment, the emission current generated by discharge during the high-voltage aging process of the product is the current peak value, and the low-frequency emission current signal is the effective value of the current.

[0008] In a preferred embodiment, the ion current and discharge current signal sensor has a built-in high-frequency transformer, transient voltage suppressor, surge absorber and surge overvoltage absorber to receive and filter high-frequency current signals and interference during high-frequency discharge.

[0009] In a preferred embodiment: the signal acquisition, amplification and processing device is installed outside the lead room of the aging equipment and is connected and communicated with the high-voltage aging equipment controller.

[0010] The present invention also provides high-voltage aging equipment, which is equipped with the ion current and discharge current collection and detection device during the high-voltage aging and testing process as described above; and the high-voltage air or nitrogen working cylinder used in the aging process is wound with a magnetic control coil for product vacuum detection.

[0011] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0012] Traditional high-voltage aging processes for vacuum interrupters consist of only a few aging steps with gradually increasing voltages. However, this process and apparatus, in addition to these conventional aging steps, also includes vacuum level detection, high-voltage aging effect control, and performance testing and determination. Newly added ion current and discharge current signal sensors, along with signal acquisition, amplification, and processing devices, measure the product's vacuum level before aging, as well as the product's emission current and discharge frequency during high-voltage aging. This allows the vacuum interrupter's high-voltage aging effect to be controlled, and the product's electrical performance after aging, such as power frequency withstand voltage and lightning impulse performance, to be determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A simplified structural diagram of a high-pressure aging device in a preferred embodiment of the present invention;

[0014] Figure 2 A circuit diagram of an ion current and discharge current signal sensor in a preferred embodiment of the present invention;

[0015] Figure 3 This is a circuit diagram of a signal acquisition, amplification, and processing device in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below through the accompanying drawings and specific embodiments.

[0017] refer to Figure 1 , ion current, discharge current collection and detection device during high-voltage aging and testing, including: ion current and discharge current signal sensor, signal collection, amplification, and processing device;

[0018] The ion current and discharge current signal sensors are connected to the center end and ground end of the base of each high-pressure nitrogen working cylinder of the high-pressure aging. In this embodiment, there are 3 high-pressure nitrogen working cylinders as an example, and there are also 3 sensors correspondingly; the ion current and discharge current signal sensors collect the current value and ion current discharged by the product during the aging and testing process in real time, and separate the high-frequency discharge signal and the low-frequency emission current signal from the aging discharge current, and send the high-frequency discharge signal, the low-frequency emission current signal and the ion current signal to the signal acquisition, amplification and processing device; the signal acquisition, amplification and processing device is installed outside the lead room of the aging equipment, and is connected and communicated with the high-voltage aging equipment controller PLC and HMI.

[0019] The signal acquisition, amplification and processing device calculates the emission current and discharge times generated by the discharge of the product during the high-voltage aging process through the high-frequency discharge signal and the low-frequency emission current signal.

[0020] Further references Figure 2 The ionization signal generated in the product vacuum test (i.e., signal sensor OUTPUT1) and the high and low frequency discharge signal generated in the high voltage aging (i.e., signal sensor OUTPUT2) are respectively connected in parallel with the two sets of overvoltage and overcurrent protection components in the main circuit through the ion current signal and discharge current sensor, namely, TVS, SPD, and RV components in the figure, and then enter the sampling resistor R1 and the high-frequency transformer T for filtering respectively. The isolated output is combined with R and C to form LC and RC oscillation circuits respectively to obtain the ionization signal during the product vacuum test; and the high and low frequency discharge signals of the product high voltage aging, including high frequency (>2MHz) discharge and low frequency (<2KHz) emission current signals.

[0021] Further references Figure 3 The ionization current, high-frequency discharge, and low-frequency emission current signals are input into the acquisition, amplification, and processing devices. After amplification, processing, and calculation, three current signals, Iion and Ie+Id, are generated. Iion represents the ion current during the product vacuum test. Ie and Id represent the emission current and discharge current during high-voltage burn-in. The emission current signal, Ie, is a peak value that accurately measures the leakage current generated by the product during high-voltage burn-in. If the effective value of the emission current flowing through the signal sensor is 7.07 mArms, then Ie equals 10 mA.

[0022] The discharge current signal Id represents the number of discharges. When a pulse signal, such as a 0.7V peak value, is detected by the signal sensor, the acquisition, amplification, and processing device is triggered, and its counter counts one discharge. Therefore, if a high-frequency pulse discharge occurs during voltage burn-in, the acquisition, amplification, and processing device can accurately accumulate the total number of discharges during burn-in.

[0023] The aforementioned ion current and discharge current acquisition and detection device can be integrated into existing aging equipment or implemented in a completely new high-voltage aging process and device. Furthermore, in this embodiment, a magnetic control coil is wound around the high-pressure nitrogen working cylinder for product vacuum detection.

[0024] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. The ion current and discharge current collection and detection device during the aging and testing process is characterized by include: Ion current and discharge current signal sensors and signal acquisition, amplification and processing devices; The ion current and discharge current signal sensor is connected between the center end of the base of each working cylinder position of the aging and the ground terminal; the ion current and discharge current signal sensor collects the current value and ion current discharged by the product during the aging and testing process in real time, and separates the high-frequency discharge signal and the low-frequency emission current signal from the aging discharge current, and sends the high-frequency discharge signal, the low-frequency emission current signal and the ion current signal to the signal acquisition, amplification and processing device; The signal acquisition, amplification and processing device calculates the emission current and discharge times generated by the product during the high-voltage aging process through high-frequency discharge signals and low-frequency emission current signals; the signal acquisition, amplification and processing device calculates the vacuum degree of the test process through ion current.

2. The device for collecting and detecting ion current and discharge current during aging and testing according to claim 1, characterized in that: The emission current generated by discharge during the aging process of the product is the current peak value, and the low-frequency emission current signal is the current effective value.

3. The device for collecting and detecting ion current and discharge current during aging and testing according to claim 1, characterized in that: The ion current and discharge current signal sensor is built-in with a high-frequency transformer, a transient voltage suppressor, a surge absorber and a surge overvoltage absorber to receive and filter high-frequency current signals and interference during high-frequency discharge.

4. The device for collecting and detecting ion current and discharge current during aging and testing according to claim 1, characterized in that: The signal acquisition, amplification and processing device is installed outside the lead room of the aging equipment and is connected and communicated with the aging equipment controller.

5. Aging equipment, characterized by: The device is equipped with an ion current and discharge current collection and detection device during the aging and testing process as described in any one of claims 1 to 4, and the high-pressure dry air or nitrogen working cylinder used in the aging process is wound with a magnetic control coil for product vacuum detection.

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