CN202837477U - Cable defect simulation test device - Google Patents

Abstract

The utility model discloses a cable defect simulation test device, which comprises a power frequency non-partial discharge pressurization system, a partial discharge test system and cables with defects, the power frequency no partial discharge pressurization system and the partial discharge The test systems are each connected to the defective cable. The utility model is applied to the partial discharge test for simulating defects on short cables, and evaluates the insulation level of cables containing defects through live test results. The test results are more real and credible, and have practical engineering significance. The utility model utilizes the time-frequency analysis method to carry out the simulated identification of the partial discharge of the actual cable. The simulated identification result can be compared and analyzed with the real cable with defects, which is beneficial to optimize and popularize the live test of the cable and ensure the safe and reliable operation of the cable.

Description

Cable defect simulation test device

technical field

The utility model relates to a test device, in particular to a cable defect simulation test device.

Background technique

The IEC60840 standard and the national standard GB/T11017.1 promulgated by the International Electrotechnical Commission stipulate the partial discharge requirements for the routine test of 110kV XLPE cables. Partial discharges are inevitable during operation. In the initial stage, partial discharge often does not affect the normal operation of the cable, but with the continuous development of partial discharge, local defects will become more and more serious, eventually leading to insulation breakdown and power outage accidents.

In view of this, it is necessary to establish a comprehensive cable defect simulation test platform, to study the partial discharge characteristic map of cables under typical defects, and to carry out the pattern recognition of high-voltage cable partial discharge defects.

Contents of the invention

The purpose of the utility model is to provide a cable defect simulation test device, which can find out the cause of the fault by analyzing the actual cable with defects, so as to ensure the safe and reliable operation of the cable.

The purpose of this utility model is achieved in that:

A cable defect simulation test device, which includes a power frequency non-partial discharge pressurization system, a partial discharge test system and a cable with defects, the power frequency no partial discharge pressurization system and the partial discharge test system are the same as the defective cable connections described above.

In one of the embodiments, the power frequency non-partial discharge pressurization system includes a control console, a voltage regulator, an isolation transformer and a filter connected in sequence, and also includes a non-partial discharge insulating barrel transformer and a high voltage protection resistor connected in sequence and a capacitive voltage divider; wherein, the output end of the filter is connected to the low-voltage side of the non-partial discharge insulating cylindrical transformer, and the high voltage side of the non-partial discharge insulating cylindrical transformer is connected to a high-voltage protection resistor, and the A voltage regulator is connected to the defective cable.

In one of the embodiments, the partial discharge testing system includes a partial discharge sensor, a partial discharge collection device, a partial discharge analysis device and a synchronous signal sensor, the partial discharge sensor, the partial discharge collection device and the partial discharge analysis The devices are connected in sequence, the synchronization signal sensor is connected to the partial discharge collection device, and the partial discharge sensor is connected to the defective cable.

In one embodiment, the defective cable includes a body, a first terminal and a second terminal, and the first terminal or the second terminal is provided with a defect.

In one of the embodiments, the first terminal or the second terminal is a porcelain sleeve terminal, and the second terminal or the first terminal is a GIS terminal, wherein defects are provided in the porcelain sleeve terminal.

Compared with the prior art, the cable defect simulation test device of the present utility model has the following beneficial effects:

The utility model is applied to the partial discharge test for simulating defects on short cables, and evaluates the insulation level of cables containing defects through live test results. The test results are more real and credible, and have practical engineering significance.

The utility model utilizes the time-frequency analysis method to carry out the simulated identification of the partial discharge of the actual cable. The simulated identification result can be compared and analyzed with the real cable with defects, which is beneficial to optimize and popularize the live test of the cable and ensure the safe and reliable operation of the cable.

Description of drawings

Fig. 1 is the block diagram of the structure of the cable defect simulation test device of the present invention;

Fig. 2 is a structural block diagram of the power frequency non-partial discharge pressurization system of the utility model;

Fig. 3 is a structural block diagram of the partial discharge testing system of the present invention.

Detailed ways

As shown in Figure 1, the cable defect simulation test device of the present invention includes a power frequency non-partial discharge pressurization system 11, a partial discharge test system 12 and a defective cable 13, and the power frequency no partial discharge pressurization system 11 and the partial discharge testing system 12 are connected to the defective cable 13 . The defective cable 13 is pressurized through the non-power frequency partial discharge pressurization system 11, and then the partial discharge test system 12 is used to perform partial discharge test, statistical analysis and simulation identification. Because the defect layout of the cable 13 containing defects is known, it can be compared with cables containing the same defect, analyzed and promoted, and the live test method of the 110KV XLPE cable can be optimized.

In this embodiment, the defective cable 13 is a 110KV XLPE defective cable. The defect-containing cable 13 includes a main body, a first terminal and a second terminal, the first terminal is a porcelain sleeve terminal, the second terminal is a GIS terminal, and a defect is set in the ceramic sleeve terminal.

As shown in Figure 2, the power frequency non-partial discharge pressurization system 11 is powered by a 220V AC power supply, which includes a console 111, a voltage regulator 112, an isolation transformer 113 and a power filter 114 connected in sequence, and also includes a sequence connected in sequence Partial discharge-free insulating cylindrical transformer 115, high-voltage protection resistor 116, and capacitive voltage divider 117; wherein, the output end of the filter 114 is connected to the low-voltage side of the non-partial discharge-free insulating cylindrical transformer 115, and the non-partial discharge The high voltage side of the partial discharge insulating barrel transformer 115 is connected to a high voltage protection resistor 116 , and the voltage regulator 112 is connected to the defective cable 13 . The isolation transformer 113 is used to isolate common-mode and differential-mode interference on the power supply side, and the power filter 114 is used to improve the waveform of the output voltage of the high-voltage side of the non-partial discharge insulating cylindrical transformer 115, making it closer to a sinusoidal waveform .

As shown in Figure 3, the partial discharge testing system 12 includes a partial discharge sensor 121, a partial discharge collection device 122, a partial discharge analysis device 123 and a synchronous signal sensor 124, the partial discharge sensor 124, the partial discharge collection device 122 and the partial discharge analyzing device 123 are sequentially connected, the synchronous signal sensor 124 is connected to the partial discharge collecting device 122 , and the partial discharge sensor 124 is connected to the defective cable 13 . In this preferred embodiment, the partial discharge sensor 121 is an HFCT sensor.

The partial discharge testing system 12 uses the synchronous signal sensor 124 to obtain the phase information of the actual voltage of the defective cable 13. There are two ways to realize it. One is to use the AC voltage synchronization device to directly obtain the phase information, and the other is to first use the The Rogowski coil synchronous sensor acquires the load current phase information of the defective cable 13, and then performs phase correction according to the actual load condition. The partial discharge testing system uses the HFCT sensor 13 to collect high-frequency discharge pulse signals. The HFCT sensor 13 is a jaw type, and the ground wire does not need to be disconnected during the test, and the load effect is extremely small, and has no impact on the operation of the defective cable 13 . The partial discharge analysis system 123 performs cluster analysis on the partial discharge signals collected by the partial discharge collection device 122 , and uses different time-frequency characteristics of different discharge types to distinguish different discharges, so as to realize pattern recognition of discharge types.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (4)

1. A cable defect simulation test device is characterized in that it includes a power frequency non-partial discharge pressurization system, a partial discharge test system and a cable containing defects, the power frequency no partial discharge pressurization system and the local Discharge test systems are all connected to the defective cables. 2. The cable defect simulation test device according to claim 1, characterized in that, said power frequency non-partial discharge pressurization system includes a console, a voltage regulator, an isolation transformer and a filter connected in sequence, and also includes a sequence connected in sequence a non-partial discharge insulating cylindrical transformer, a high-voltage protection resistor and a capacitor voltage divider; wherein, the output end of the filter is connected to the low-voltage side of the non-partial discharge insulating cylindrical transformer, and the non-partial discharge insulating cylindrical transformer The high-voltage side of the transformer is connected with a high-voltage protection resistor, and the voltage regulator is connected with the defective cable. 3. The cable defect simulation test device according to claim 1, wherein the defect-containing cable comprises a body, a first terminal and a second terminal, and the first terminal or the second terminal is provided with a defect. 4. The cable defect simulation test device according to claim 3, characterized in that, the first terminal or the second terminal is a porcelain sleeve terminal, and the second terminal or the first terminal is a GIS terminal, Wherein, there is a defect in the porcelain sleeve terminal.

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