CN203025309U - Direct current partial discharge test analysis device for analog converter transformer - Google Patents

Abstract

The utility model provides a direct current partial discharge test analysis device for an analog converter transformer which can simulate the typical insulation defect of the converter transformer. The direct current partial discharge test analysis device comprises an integrated control console, wherein the integrated control console is sequentially connected with an alternating current voltage regulating transformer, a silicon stack and a protective resistor; the protective resistor is connected in parallel with a voltage divider, an oscilloscope circuit and a detection model circuit; the oscilloscope circuit comprises a coupling capacitor and a detection impedance; the coupling capacitor and a detection impedance are connected with the oscilloscope and are connected with the integrated control console through the oscilloscope; and the detection model circuit comprises a surge protector and a detection module and is connected into the integrated control console through the detection model. The direct current partial discharge test analysis device is simple in structure and can simulate the typical insulation defect of the converter transformer, and the process test and analysis of direct current partial discharge generation and development under different voltages are realized.

Description

A Simulated Converter Transformer DC Partial Discharge Test and Analysis Device

technical field

The utility model relates to the field of DC partial discharge test of converter transformers, in particular to a DC partial discharge test and analysis device for simulating typical insulation defects of converter transformers.

Background technique

The UHV converter transformer is a vital equipment in the DC transmission system, and its operating status directly affects the safety and stability of the system. The safety and reliability of the converter transformer mainly depends on its insulation performance. During the long-term operation of the converter transformer, some weak parts of its internal insulation may undergo partial discharge under high field strength, resulting in insulation degradation. Under the long-term action of severe partial discharge, it may even cause breakdown, resulting in transformer failure damage.

Therefore, it is necessary to provide a DC partial discharge test and analysis device for simulating typical insulation defects of converter transformers, aiming at the DC partial discharge requirements of converter transformers and some typical insulation defect characteristics in converter transformers, so as to meet the requirements of realizing the conversion The needs of transformer DC partial discharge test analysis and diagnosis provide test basis and analysis and diagnosis basis for converter DC partial discharge field test. How to realize the selection and combination of several typical insulations, so as to realize the test and analysis of the occurrence and development of DC partial discharge under different voltages is the key to the whole test and analysis device.

Contents of the invention

The technical problem to be solved by the utility model is to provide a simulation converter capable of simulating the typical insulation defects of the converter transformer and realizing the process test and analysis of the occurrence and development of DC partial discharge under different voltages. DC partial discharge test and analysis device for DC transformers.

The technical scheme that the utility model solves its technical problem adopts is:

A device for simulating the DC partial discharge test and analysis of a converter transformer, characterized in that it includes a comprehensive console, the comprehensive control is sequentially connected with an AC voltage regulating transformer, a silicon stack, and a protection resistor, and the protection resistor is connected in parallel with a voltage divider, an oscilloscope line and The detection model circuit, the oscilloscope circuit includes a coupling capacitor and the detection impedance, both of which are connected to the oscilloscope, and are connected to the integrated console through the oscilloscope, and the detection model circuit includes a surge protector and a detection model, and are connected through the The detection model is connected to the integrated console.

In the above scheme, the detection model includes the following six typical insulation defect models: oil-paper needle board insulation defect, wedge-shaped insulation defect, suspension insulation defect, surface insulation defect, parallel plate gap insulation defect, internal insulation defect, these six types Defect models are made according to some typical defect characteristics in converter flow.

In the above scheme, each defect model in the detection model is connected to the integrated console, and the connection and disconnection of each defect model can be controlled separately through the integrated console, and any defect model can also be controlled. Select and combine.

In the above solution, the bandwidth of the oscilloscope is 200MHz, and the sampling rate is 1GS/s.

In the above solution, the integrated console has a display screen, which can display the waveform and data of the oscilloscope in real time.

The device of the utility model is a test analysis device integrating a DC partial discharge test device and a DC partial discharge analysis device. The connection of each insulation defect model is controlled through the integrated console, and the conversion between various models can be quickly realized. Through By selecting and combining various insulation defect models, targeted analysis and comparison can be carried out, the input voltage can be adjusted through the integrated console, and the partial discharge signal waveform can be observed in real time, and the DC partial discharge can be analyzed under different models and voltages process of occurrence and development.

The technical effect that the utility model obtains:

1. Through the utility model DC partial discharge test analysis device, it is possible to realize the quick selection and combination of various models in the test so as to conduct comprehensive analysis on it. The test analysis device can display the DC partial discharge signal waveform and data in real time. Through the comprehensive The console can conveniently control the voltage input to obtain a better partial discharge signal, so as to realize the process test and analysis of the occurrence and development of DC partial discharge under different voltages.

2. The surge protector in the test analysis device can effectively avoid the impact of overvoltage on the test equipment caused by the breakdown of the detection model during the test.

3. This utility model is mainly aimed at the DC partial discharge test. This set of test equipment can effectively guide the DC partial discharge test, and can provide analysis and diagnosis basis for the factory or field test of the DC partial discharge of the converter converter, and provide a basis for the on-site DC partial discharge test. The implementation of the test has laid a good foundation for the analysis and diagnosis of typical defects of DC partial discharge in converter transformers, providing analysis methods and detection means, etc., which can provide a useful supplement to the detection, analysis and diagnosis of existing converter transformers.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment

In the figure: 1-integrated console, 2-AC voltage regulating transformer, 3-silicon stack, 4-protection resistor, 5-voltage divider, 6-coupling capacitor, 7-detection impedance, 8-detection model, 9-wave surge protector, 10-oscilloscope.

Detailed ways

Below in conjunction with specific embodiment, the utility model is further described:

As shown in Figure 1, the simulated converter transformer DC partial discharge test and analysis device connects the 220V/50Hz AC power supply to the AC voltage regulating transformer 2 through the integrated console 1, and the high-voltage AC power is rectified into a high-voltage DC output through the silicon stack 3. The pile is connected to the protection resistor 4, the function of the protection resistor is to prevent damage to the AC voltage regulating transformer 2 and the silicon pile 3 caused by the overcurrent caused by the breakdown of the detection model, and the function of the voltage divider 5 is to isolate the high voltage and display the voltage in real time The current value and DC high voltage are directly connected to the detection model 8. The detection model 8 contains six typical insulation defects, namely oil-paper needle plate insulation defects, wedge-shaped insulation defects, suspension insulation defects, surface insulation defects, and parallel plate gap insulation defects. Internal insulation defects, these six defect models are made according to some typical defect characteristics in the converter, the selection and combination of these typical insulation defects can be realized through the console 1, and the surge protector 9 is connected to the The role behind the detection model 8 is to prevent damage to detection equipment such as the oscilloscope 10 due to overcurrent and overvoltage caused by the sudden breakdown of the detection model 8 .

The coupling capacitor 6 and the detection impedance 7 are connected in parallel with the detection model. The coupling capacitor 6 is used to isolate the power frequency high voltage on the one hand, so that the power frequency voltage on the detection impedance 7 is very low, so as to ensure that the measuring device can work safely; on the other hand, it will The partial discharge signal of the sample is coupled to the detection impedance 7 .

The detection impedance 7 plays the role of sampling, taking the partial discharge signal out of the high voltage test circuit, and sending it to the partial discharge detection instrument oscilloscope 10, the bandwidth of the oscilloscope 10 is 200MHz, and the sampling rate is 1GS/s.

The integrated console 1 is respectively connected to the AC step-up transformer 2, the detection model 8 and the oscilloscope 10 through cables, etc., and can realize real-time control of the input voltage, and can realize the selection and combination of various insulation defect models in the detection model 8 , The integrated console has a display screen, which can display DC partial discharge signals in real time.

The device of the utility model is a test analysis device integrating a DC partial discharge test device and a DC partial discharge analysis device. The connection of each insulation defect model is controlled through the integrated console, and the conversion between various models can be quickly realized. Through By selecting and combining various insulation defect models, targeted analysis and comparison can be carried out, the input voltage can be adjusted through the integrated console, and the partial discharge signal waveform can be observed in real time, and the DC partial discharge can be analyzed under different models and voltages process of occurrence and development.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, All still belong to within the scope of the present utility model.

Claims (5)

1. simulate converter power transformer dc partial discharge analysis of experiments device for one kind; it is characterized in that: include mixing console; Comprehensive Control is connected with AC voltage adjusting transformer, silicon stack, protective resistance in turn; protective resistance is parallel with voltage divider, oscillograph circuit and detection model circuit; described oscillograph circuit includes coupling condenser and detects impedance; both are connected with oscillograph; and access mixing console by oscillograph; described detection model circuit includes Surge Protector and detection model, and accesses mixing console by detection model.

2. simulation converter power transformer dc partial discharge analysis of experiments device as claimed in claim 1, it is characterized in that: described detection model comprises following six kinds of typical insulation defect models: oilpaper needle plate insulation defect, the wedge shape insulation defect, the suspension insulation defect, the surface insulation defective, parallel-plate gap insulation defective, the built-in electrical insulation defective.

3. simulation converter power transformer dc partial discharge analysis of experiments device as claimed in claim 1 or 2, it is characterized in that: each defect model in described detection model all is connected with mixing console, control respectively the connection of each defect model and cut-off by mixing console, also can realize controlling any selection and combination between each defect model.

4. simulation converter power transformer dc partial discharge analysis of experiments device as claimed in claim 1, it is characterized in that: described oscillographic bandwidth is 200MHz, sampling rate is 1GS/s.

5. simulation converter power transformer dc partial discharge analysis of experiments device as claimed in claim 1, it is characterized in that: described mixing console is with the display screen that can show in real time waveform and data.