Full-function partial discharge tester

Abstract

The utility model discloses a full-function partial discharge tester, which comprises a tester main body, a protective shell is arranged on the surface of the tester main body, a display screen is arranged on the front side of the tester main body, and a data viewing page switching key, a power key and a function key are arranged on the surface of the protective shell of the tester main body at the bottom end of the display screen. A charging port is formed in one side of the bottom of the tester main body, and a Type-c connecting port is formed in the center of the bottom of the tester main body; the tester is a multifunctional handheld instrument and is used for testing the partial discharge condition of equipment based on a transient earth voltage, ultrasonic wave, ultrahigh frequency and high-frequency current detection method, a display screen can provide readable atlases such as partial discharge amplitude, phase, waveform, two-dimensional, three-dimensional and screen recording, and the partial discharge condition of electrical equipment can be stored and read to evaluate the partial discharge condition of the electrical equipment. The tester main body is suitable for partial discharge detection of electrical equipment such as a cable, a GIS, a switch cabinet and a transformer.

Description

Technical Field

[0001] This utility model relates to the field of partial discharge testing technology, and in particular to a full-function partial discharge tester. Background Technology

[0002] Partial discharge primarily refers to the phenomenon in high-voltage electrical equipment. According to power grid statistics, partial discharge is a significant cause of insulation breakdown in high-voltage electrical equipment and a major indicator of insulation degradation. Partial discharge occurs locally within the insulation of electrical equipment under the influence of a sufficiently strong electric field. This discharge is limited to causing only a localized short circuit (bridging) between conductors without forming a conductive path. Each partial discharge has some impact on the insulating medium; minor partial discharges have a smaller impact on the insulation, with a slower decrease in insulation strength; however, strong partial discharges cause a rapid decrease in insulation strength. This is a major factor leading to insulation damage in high-voltage electrical equipment. Partial discharge is a precursor to localized overheating and aging of electrical and mechanical components. The trend of partial discharge is an exponential increase over time, a tortuous process with periods of decrease and increases. When partial discharge occurs in the insulation structure, it is accompanied by electrical pulses, ultrasonic waves, electromagnetic radiation, light, chemical reactions, and localized heating. Due to these characteristics, preventing and eliminating partial discharge in electrical equipment to ensure its normal and safe operation is a primary concern for electrical equipment maintenance personnel.

[0003] To eliminate this latent fault phenomenon, many online detection methods for partial discharge phenomena have been developed, targeting signals such as electrical pulses, ultrasonic waves, and electromagnetic radiation that accompany partial discharge. To detect partial discharge, we propose a full-function partial discharge tester. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a full-function partial discharge tester. The tester is a multifunctional handheld instrument that uses transient ground voltage, ultrasonic waves, ultra-high frequency, and high frequency current detection methods to test the partial discharge status of equipment. The display screen can provide readable partial discharge amplitude, phase, waveform, two-dimensional, three-dimensional, and screen recording graphs. It can store and read readings to evaluate the partial discharge status of electrical equipment. The main body of the tester is suitable for partial discharge detection of electrical equipment such as cables, GIS, switch cabinets, and transformers.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a full-function partial discharge tester, including a tester body, a protective shell on the surface of the tester body, a display screen on the front of the tester body, a data viewing page switching key, a power key, and a function key on the surface of the protective shell at the bottom of the display screen, a charging port on one side of the bottom of the tester body, a Type-C connector at the center of the bottom of the tester body, a TF card on the inner side of the tester body at the bottom of the Type-C connector, a headphone jack on the side of the tester body away from the charging port, headphone volume control buttons on the inner side of the tester body at the bottom of the headphone jack, a headphone jack connected to a headphone body via a headphone cable, a charging power supply electrically connected to the inside of the charging port, and a signal synchronizer on one side of the tester body.

[0006] As a preferred technical solution of this utility model, the inner side of the main body of the tester is provided with transient ground voltage detection function, ultrasonic detection function, high frequency current detection function, ultra-high frequency detection function, WIFI version signal synchronization function and power supply synchronization function.

[0007] As a preferred technical solution of this utility model, the main body of the tester is connected to the corresponding UTF probe, HFCT probe, external TEV&AE probe, signal synchronizer, contact ultrasonic probe, horn ultrasonic probe, and curved tube ultrasonic probe via connecting cables as required.

[0008] As a preferred technical solution of this utility model, the ultra-high frequency detection function has PRPS / PRPD detection mode and time domain mode.

[0009] As a preferred technical solution of this utility model, the high-frequency current detection function includes HFCT amplitude, HFCT periodogram, and PRPS / PRPD detection.

[0010] Compared with the prior art, the beneficial effects that this utility model can achieve are:

[0011] 1. The full-function partial discharge tester is a multifunctional handheld instrument that uses transient ground voltage, ultrasonic waves, ultra-high frequency, and high frequency current detection methods to test the partial discharge status of equipment. The display screen can provide readable partial discharge amplitude, phase, waveform, two-dimensional, three-dimensional, and screen recording graphs. It can store and read readings to assess the partial discharge status of electrical equipment. The main body of the tester is suitable for partial discharge detection of electrical equipment such as cables, GIS, switch cabinets, and transformers.

[0012] 2. By setting up transient ground voltage detection, ultrasonic detection, high-frequency current detection, ultra-high frequency detection, WIFI signal synchronization, and power synchronization functions, the instrument enables personnel to more comprehensively detect partial discharge in electrical equipment. The transient ground voltage detection function uses the transient ground voltage method to detect the internal discharge activity of switching equipment. Personnel can view the data and delete previous detection data. The signal synchronization function ensures that the phase of various spectrum detections is consistent with the frequency of the on-site power frequency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the front structure of the tester of this utility model.

[0014] Figure 2 This is a schematic diagram of the bottom structure of the tester of this utility model.

[0015] Figure 3 This is a schematic diagram of the connection instrument structure of this utility model.

[0016] The components include: 1. Main body of the tester; 2. Display screen; 3. Data viewing page switching key; 4. Power button; 5. Function key; 6. Charging port; 7. TF card; 8. Type-C connector; 9. Headphone volume control key; 10. Headphone jack; 11. UTF probe; 12. External TEV&AE probe; 13. HFCT probe; 14. Signal synchronizer; 15. Contact ultrasonic probe; 16. Speaker ultrasonic probe; 17. Bent tube ultrasonic probe; 18. Headphone body; 19. Charging power supply; 20. Connecting cable. Detailed Implementation

[0017] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation are all within the protection scope of this utility model without creative effort.

[0018] For an example, please refer to... Figure 1 , Figure 2 , Figure 3As shown, this utility model provides a full-function partial discharge tester, including a tester body 1. A protective shell is provided on the surface of the tester body 1. A display screen 2 is provided on the front of the tester body 1. A data viewing page switching key 3, a power key 4, and a function key 5 are provided on the surface of the protective shell at the bottom of the tester body 1. A charging port 6 is provided on one side of the bottom of the tester body 1. A Type-C connector 8 is provided at the center of the bottom of the tester body 1. A TF card 7 is provided on the inner side of the tester body 1 at the bottom of the Type-C connector 8. A headphone jack 10 is provided on the side of the tester body 1 away from the charging port 6. A headphone jack 10 is installed on the inner side of the tester body 1 at the bottom of the headphone jack 10. The headphone volume control button 9 and headphone jack 10 are connected to the headphone body 18 via a headphone cable. The charging port 6 is electrically connected to a charging power supply 19. A signal synchronizer 14 is set on one side of the tester body 1. The full-function partial discharge tester is a multi-functional handheld instrument that tests the partial discharge status of equipment based on transient ground voltage, ultrasonic, ultra-high frequency, and high frequency current detection methods. The display screen 2 can provide readable partial discharge amplitude, phase, waveform, two-dimensional, three-dimensional, and screen recording graphs. It can store and read readings to evaluate the partial discharge status of electrical equipment. The tester body 1 is suitable for partial discharge detection of electrical equipment such as cables, GIS, switch cabinets, and transformers.

[0019] like Figure 1 As shown, the inner side of the main body 1 of the tester is equipped with transient ground voltage detection function, ultrasonic detection function, high frequency current detection function, ultra-high frequency detection function, WIFI signal synchronization function, and power synchronization function. By setting transient ground voltage detection function, ultrasonic detection function, high frequency current detection function, ultra-high frequency detection function, WIFI signal synchronization function, and power synchronization function, the personnel can more comprehensively detect the partial discharge of electrical equipment by using the main body 1 of the tester. The transient ground voltage detection function uses the transient ground voltage method to detect the internal discharge activity of the switching equipment. The personnel can view the data and delete the previous detection data. The signal synchronization function keeps the phase of various spectrum detection consistent with the frequency of the power frequency on site.

[0020] like Figure 1 , Figure 2 , Figure 3 As shown, the main body 1 of the tester is connected to the corresponding UTF probe 11, HFCT probe 13, external TEV&AE probe 12, contact ultrasonic probe 15, horn ultrasonic probe 16, and bent tube ultrasonic probe 17 via connecting cable 20 as required. The main body 1 of the tester is suitable for various probes. The ultrasonic detection function uses a non-contact acoustic sensor built into the main unit to detect the discharge activity of switchgear using ultrasonic methods. Ultrasonic waves are commonly used for ultrasonic long-distance partial discharge inspection, ultrasonic gas leak detection, ultrasonic partial discharge location, and partial discharge detection of switchgear.

[0021] like Figure 1 As shown, the UHF detection function has PRPS / PRPD measurement mode and time domain mode.

[0022] like Figure 1 As shown, the high-frequency current detection function includes HFCT amplitude, HFCT periodogram, and PRPS / PRPD detection.

[0023] Specific working principle:

[0024] Transient ground voltage occurs when partial discharge occurs in high-voltage electrical equipment. The discharged charge first accumulates in the grounded metal part adjacent to the discharge point, forming electromagnetic waves that propagate in all directions. These electromagnetic waves propagate through the seams of the metal enclosure or the gaskets of the gas-insulated switch, simultaneously generating a transient ground voltage that travels to the ground through the outer surface of the equipment's metal enclosure. Transient ground voltage partial discharge monitoring is based on the fact that normal electrical equipment rarely emits transient ground wave signals between 3-100MHz. When using this principle for partial discharge monitoring, the relationship between the pulse signal and voltage phase does not need to be considered, thus it can be used for routine condition monitoring of a large number of devices in the power grid. However, auxiliary equipment in the power station, such as lighting systems with electronic ballasts, charging systems using semiconductor switching elements for voltage regulation, carrier communication equipment, and discharge tubes with main circuit live indicators, may generate signals in the aforementioned frequency band. Therefore, when applying this method for partial discharge monitoring, it is important to eliminate and distinguish such interference signals. If necessary, other testing instruments, such as spectrum analyzers and oscilloscopes, can be used to confirm partial discharge and distinguish interference signals.

[0025] Ultrasonic waves are generated during the discharge process of electrical equipment. The sound spectrum of the discharge is very wide, ranging from tens of Hz to several MHz. Signals with frequencies below 20 kHz are audible to the human ear, while ultrasonic signals with frequencies higher than this must be detected by ultrasonic sensors. Based on the relationship between the energy released by the discharge and the sound energy, the change in the sound pressure of the ultrasonic signal represents the change in the energy released by the partial discharge. By measuring the sound pressure of the ultrasonic signal, the strength of the discharge can be inferred. This is the basic principle of ultrasonic signal detection of partial discharge.

[0026] Ultra-high frequency (UHF) electromagnetic waves are used in power equipment insulators where insulation strength and breakdown field strength are very high. When partial discharge occurs within a very small area, the breakdown process is rapid, generating a very steep pulse current with a rise time of less than 1 ns, and exciting electromagnetic waves with frequencies up to several GHz. The basic principle of the UHF method for partial discharge detection is to detect the UHF electromagnetic wave signals generated during partial discharge in power equipment using a UHF sensor, thereby obtaining relevant information about the partial discharge and realizing partial discharge monitoring. The UHF detection frequency band is 300MHz-1.5GHz. Depending on the specific equipment conditions, both built-in and external UHF sensors can be used. Since corona interference in the field is mainly concentrated below 300MHz, the UHF method can effectively avoid corona interference and has high sensitivity and anti-interference capabilities, enabling advantages such as live partial discharge detection, location, and defect type identification.

[0027] High-frequency current is used in electrical equipment where insulation strength and breakdown field strength are very high. When local discharge occurs within a small area, the breakdown process is rapid, generating a very steep pulse current. When partial discharge occurs inside high-voltage electrical equipment, the discharge current propagates to the ground along the grounding wire, and the pulse current generated by the partial discharge can be detected on the equipment's grounding wire. High-frequency current sensors (HFCTs) based on this method typically use Rogowski coils. Detection using a high-frequency current sensor connected to the grounding wire of electrical equipment is a non-invasive detection method; the equipment being tested does not need to be shut down, making it simple and reliable.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fully functional partial discharge tester comprising a tester body (1) characterised in that: The tester body (1) is provided with a protective shell on the surface, the tester body (1) is provided with a display screen (2) on the front, the display screen (2) is provided with a data viewing page switching key (3), a power key (4) and a function key (5) on the surface of the protective shell at the bottom of the tester body (1), the tester body (1) is provided with a charging port (6) on one side of the bottom, the tester body (1) is provided with a Type-c connecting port (8) at the center of the bottom, the Type-c connecting port (8) is provided with a TF card (7) on the inner side of the tester body (1) at the bottom, the tester body (1) is provided with an earphone interface (10) on the side away from the charging port (6), the earphone interface (10) is installed with an earphone volume adjusting key (9) on the inner side of the tester body (1) at the bottom, the earphone interface (10) is connected with an earphone body (18) through an earphone wire, the charging port (6) is connected with a charging power supply (19) through electricity, and the tester body (1) is provided with a signal synchronizer (14) on one side.

2. The fully functional partial discharge tester of claim 1, wherein: The tester body (1) is provided with a transient voltage detection function, an ultrasonic detection function, a high-frequency current detection function, a very high frequency detection function, a WIFI version signal synchronization function and a power supply synchronization function on the inner side.

3. The fully functional partial discharge tester of claim 1, wherein: The tester body (1) is connected with corresponding UTF probe (11), HFCT probe (13), external TEV&AE probe (12), signal synchronizer (14), contact type ultrasonic probe (15), loudspeaker ultrasonic probe (16) and elbow ultrasonic probe (17) through connecting cable (20) according to requirements.

4. The fully functional partial discharge tester of claim 2, wherein: The very high frequency detection function has PRPS / PRPD detection mode and time domain mode.

5. The fully functional partial discharge tester of claim 2, wherein: The high-frequency current detection function includes HFCT amplitude, HFCT cycle atlas and PRPS / PRPD detection.

Images