CN115856743A - Automatic testing system and method for low-temperature performance of partial discharge sensor - Google Patents
Automatic testing system and method for low-temperature performance of partial discharge sensor Download PDFInfo
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- CN115856743A CN115856743A CN202211390261.XA CN202211390261A CN115856743A CN 115856743 A CN115856743 A CN 115856743A CN 202211390261 A CN202211390261 A CN 202211390261A CN 115856743 A CN115856743 A CN 115856743A
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Abstract
An automatic test system for low-temperature performance of a partial discharge sensor belongs to the technical field of power equipment state monitoring, and comprises a low-temperature environment simulation chamber, a low-temperature infrared imaging unit, a dehumidification unit, a partial discharge simulation signal feed-in unit and a sensor signal lead-out unit, wherein an imaging unit lens of the low-temperature infrared imaging unit is arranged in the low-temperature environment simulation chamber; a probe of the dehumidification unit is arranged in the low-temperature environment simulation chamber; the partial discharge analog signal feed-in unit is arranged on a side wall coaxial interface I of the low-temperature environment simulation chamber through an external connecting wire; and the radio frequency coaxial line of the sensor signal leading-out unit is connected with a coaxial interface II of the low-temperature environment simulation chamber. The invention simplifies the operation steps, reduces the time consumption of the test, reduces the operation complexity and improves the test efficiency.
Description
Technical Field
The invention belongs to the technical field of power equipment state monitoring, and particularly relates to an automatic low-temperature performance testing system for a partial discharge sensor and a method for testing the low-temperature performance of the sensor commonly used in the partial discharge detection of a power system.
Background
With the proposal of a double-carbon target, new energy is subjected to large-scale grid connection, the proportion of distributed resources in high-latitude areas to be accessed into a power grid is increased year by year, the types and the number of power distribution equipment are greatly improved, and the state perception of the equipment is required to be more accurate and reliable. However, in recent years, with the increase of extreme environments, the frequency of low-temperature and extremely cold weather is higher and higher, which presents new challenges for monitoring the state of the power equipment. In order to improve the reliability of the state monitoring and sensing device of the key power distribution equipment in the extremely cold low-temperature environment, firstly, the performance change of the state monitoring and sensing device in the low-temperature environment needs to be mastered, and the low-temperature fault mechanism of the state monitoring and sensing device is researched.
However, at present, a complete automatic test system for low-temperature performance of a partial discharge sensor does not exist for assisting in the research, and people can only have a qualitative understanding on the performance reduction of the sensor according to experience in actual operation, and cannot accurately measure the performance reduction degree. The test equipment that the platform of setting up in the laboratory related is all independent operation, lacks a common brain each other, needs artificially to go centralized control and unified coordination, and the user must set for and coordinate mutual operation to each equipment respectively, and the step is numerous and diverse, wastes manpower and time, reduces efficiency of software testing. In addition, in long tests, the tests often fail due to human negligence.
Therefore, there is a need in the art for a new solution to solve the above problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the automatic test system and method for the low-temperature performance of the partial discharge sensor are provided, the operation steps are simplified, the test time consumption is reduced, the operation complexity is reduced, and the test efficiency is improved.
An automatic test system for low-temperature performance of a partial discharge sensor comprises a low-temperature environment simulation chamber, a low-temperature infrared imaging unit, a dehumidification unit, a partial discharge simulation signal feed-in unit and a sensor signal lead-out unit, wherein an imaging unit lens of the low-temperature infrared imaging unit is arranged in the low-temperature environment simulation chamber; a probe of the dehumidification unit is arranged in the low-temperature environment simulation chamber; the partial discharge analog signal feed-in unit is arranged on a side wall coaxial interface I of the low-temperature environment simulation chamber through an external connecting wire; and the radio frequency coaxial line of the sensor signal leading-out unit is connected with a coaxial interface II of the low-temperature environment simulation chamber.
The low temperature environment simulation cell is internally provided with a low temperature operation table, the low temperature operation table is provided with a sensor clamp, and the upper surface of the low temperature operation table is connected with a tubular refrigerator through a refrigeration sheet.
And the signal output ends of the low-temperature infrared imaging unit and the dehumidifying unit are connected with the control unit.
The partial discharge analog signal feed-in unit comprises a programmable signal generator, an external connecting wire, an internal current feeder and a small chamber coaxial interface, and the programmable signal generator is connected with the control unit.
The sensor signal extraction unit is used for outputting and recording a sensor response signal.
The automatic test method for the low-temperature performance of the partial discharge sensor comprises the following steps in sequence,
the method comprises the following steps that firstly, a control unit controls a dehumidification unit to be powered on, feedback control is conducted on the dehumidification unit according to a humidity monitoring result in a low-temperature environment simulation chamber, and the dehumidification unit is controlled to stop working when a preset humidity level is reached;
step two, the control unit controls the low-temperature infrared imaging unit to be powered on, performs feedback control on the tubular refrigerator according to the average temperature of the low-temperature operating platform area, and controls the tubular refrigerator to stop working when the preset temperature level is reached;
step three, the control unit controls the programmable signal generator to output a preset partial discharge analog pulse signal, controls the sensor signal leading-out unit to record a partial discharge response signal, controls the low-temperature infrared imaging unit to record an infrared image of a target to be tested on the operating platform according to a preset time step length until a test time at a preset temperature is reached, returns to the step two, and performs a test at the next preset temperature;
and step four, after the tests at all preset temperatures are finished, the control unit controls all units to stop working and sends out test finishing indication signals.
The preset humidity level in the first step, the preset temperature level in the second step and the test duration at the preset temperature in the third step are all set through an upper computer and are written into a control unit through a program.
Through the design scheme, the invention can bring the following beneficial effects: an automatic test system and method for low-temperature performance of a partial discharge sensor simplify operation steps, reduce test time consumption, reduce operation complexity and improve test efficiency.
Drawings
The invention is further described in the following detailed description in conjunction with the drawings in which:
FIG. 1 is a schematic structural diagram of an automated testing system for low-temperature performance of partial discharge sensors according to the present invention.
Fig. 2 is a schematic diagram of a low-temperature environment simulation chamber of an automatic test system for low-temperature performance of a partial discharge sensor according to the present invention.
Fig. 3 is a schematic structural diagram of a partial discharge analog signal feed-in unit of an automated test system for low-temperature performance of a partial discharge sensor according to the present invention.
FIG. 4 is a schematic flow chart of an automated testing method for low-temperature performance of partial discharge sensors according to the present invention.
In the figure, 1-a low-temperature environment simulation chamber, 2-a low-temperature infrared imaging unit, 3-a dehumidification unit, 4-a partial discharge simulation signal feed-in unit, 5-a sensor signal lead-out unit, 101-a low-temperature operating platform, 102-a sensor clamp, 103-a refrigeration sheet, 104-a tube refrigerator, 105-a coaxial interface I, 106-a coaxial interface II, 301-a detection head, 401-a programmable signal generator, 402-an external connecting line, 403-an internal current feeder line and 404-a chamber coaxial interface.
Detailed Description
An automatic test system for low-temperature performance of a partial discharge sensor is shown in fig. 1-3 and comprises a low-temperature environment simulation chamber 1, a low-temperature infrared imaging unit 2, a dehumidification unit 3, a partial discharge simulation signal feed-in unit 4 and a sensor signal lead-out unit 5, wherein an imaging unit lens of the low-temperature infrared imaging unit 2 is arranged in the low-temperature environment simulation chamber 1; the probe 301 of the dehumidification unit 3 is arranged in the low-temperature environment simulation chamber 1; the partial discharge analog signal feed-in unit 4 is arranged on a side wall coaxial interface I105 of the low-temperature environment simulation chamber 1 through an external connecting wire; and the radio frequency coaxial line of the sensor signal leading-out unit 5 is connected with a coaxial interface II 106 of the low-temperature environment simulation chamber 1.
The low-temperature environment simulation chamber 1 is internally provided with a low-temperature operating platform 101, the low-temperature operating platform 101 is provided with a sensor clamp 102, and the upper surface of the low-temperature operating platform 101 is connected with a tubular refrigerator 104 through a refrigerating sheet 103.
And the signal output ends of the low-temperature infrared imaging unit 2 and the dehumidifying unit 3 are connected with a control unit.
The partial discharge analog signal feed-in unit 4 comprises a programmable signal generator 401, an external connection line 402, an internal current feed line 403 and a chamber coaxial interface 404, wherein the programmable signal generator 401 is connected with a control unit.
The sensor signal extraction unit 5 is used for outputting and recording sensor response signals.
The method for testing the low-temperature performance of the partial discharge sensor by adopting the automatic testing system comprises the following steps which are sequentially carried out,
the method comprises the following steps that firstly, a control unit controls a dehumidification unit 3 to be powered on, feedback control is carried out on the dehumidification unit 3 according to a humidity monitoring result in a low-temperature environment simulation chamber 1, and the dehumidification unit is controlled to stop working when a preset humidity level is reached;
step two, the control unit controls the low-temperature infrared imaging unit 2 to be powered on, performs feedback control on the tubular refrigerator 104 according to the average temperature of the area of the low-temperature operating platform 101, and controls the tubular refrigerator 104 to stop working when the preset temperature level is reached;
step three, the control unit controls the programmable signal generator 401 to output a preset partial discharge analog pulse signal, controls the sensor signal leading-out unit 5 to record a partial discharge response signal, controls the low-temperature infrared imaging unit 2 to record an infrared image of a target to be tested on the operating platform in a preset time step length at the same time until the test time at the preset temperature is reached, returns to the step two, and performs the test at the next preset temperature;
and step four, after the tests at all preset temperatures are finished, the control unit controls all the units to stop working and sends out test finishing indication signals.
Specifically, the high-frequency current sensor HFCT is subjected to performance test at 0-30 ℃, and is placed on a low-temperature environment simulation chamber operating table and fixed by a clamp. An internal current feeder of the partial discharge analog signal feed-in unit penetrates through the coil, and the output of the sensor is connected with the signal lead-out unit to finish wiring preparation before testing.
And starting a system power supply, and presetting a humidity level, a temperature level and a test duration.
And starting the test, and automatically starting the system to execute the test flow.
And a tester acquires a result through the sensor signal leading-out unit, analyzes the performance of the sensor and turns off a system power supply.
Claims (7)
1. The automatic test system of the low temperature performance of a partial discharge sensor is characterized in that: the device comprises a low-temperature environment simulation chamber (1), a low-temperature infrared imaging unit (2), a dehumidification unit (3), a partial discharge simulation signal feed-in unit (4) and a sensor signal lead-out unit (5), wherein an imaging unit lens of the low-temperature infrared imaging unit (2) is arranged in the low-temperature environment simulation chamber (1); a probe (301) of the dehumidification unit (3) is arranged in the low-temperature environment simulation chamber (1); the partial discharge analog signal feed-in unit (4) is arranged on a side wall coaxial interface I (105) of the low-temperature environment simulation chamber (1) through an external connecting line; and the radio frequency coaxial line of the sensor signal leading-out unit (5) is connected with a coaxial interface II (106) of the low-temperature environment simulation chamber (1).
2. The automatic test system for the low-temperature performance of the partial discharge sensor according to claim 1, wherein: the low-temperature environment simulation chamber is characterized in that a low-temperature operating platform (101) is arranged inside the low-temperature environment simulation chamber (1), a sensor clamp (102) is arranged on the low-temperature operating platform (101), and the upper surface of the low-temperature operating platform (101) is connected with a tubular refrigerator (104) through a refrigerating sheet (103).
3. The automatic test system for the low-temperature performance of the partial discharge sensor according to claim 1, wherein: and the signal output ends of the low-temperature infrared imaging unit (2) and the dehumidifying unit (3) are connected with a control unit.
4. The automatic test system for the low-temperature performance of the partial discharge sensor according to claim 1, wherein: the partial discharge analog signal feed-in unit (4) comprises a programmable signal generator (401), an external connecting wire (402), an internal current feeder (403) and a chamber coaxial interface (404), wherein the programmable signal generator (401) is connected with the control unit.
5. The automatic test system for the low-temperature performance of the partial discharge sensor according to claim 1, wherein: the sensor signal extraction unit (5) is used for outputting and recording a sensor response signal.
6. An automatic test method for low-temperature performance of a partial discharge sensor is characterized by comprising the following steps: the automatic test system for the low-temperature performance of the partial discharge sensor in claim 1 comprises the following steps which are carried out in sequence,
the method comprises the following steps that firstly, a control unit controls a dehumidification unit (3) to be powered on, feedback control is carried out on the dehumidification unit (3) according to a humidity monitoring result in a low-temperature environment simulation chamber (1), and the dehumidification unit is controlled to stop working when a preset humidity level is reached;
step two, the control unit controls the low-temperature infrared imaging unit (2) to be powered on, performs feedback control on the tubular refrigerator (104) according to the average temperature of the area of the low-temperature operating platform (101), and controls the tubular refrigerator (104) to stop working when the preset temperature level is reached;
step three, the control unit controls the programmable signal generator (401) to output a preset partial discharge analog pulse signal, controls the sensor signal leading-out unit (5) to record a partial discharge response signal, controls the low-temperature infrared imaging unit (2) to record an infrared image of a measured target on the operation table according to a preset time step length at the same time until a test time at a preset temperature is reached, returns to the step two, and performs a test at the next preset temperature;
and step four, after the tests at all preset temperatures are finished, the control unit controls all the units to stop working and sends out test finishing indication signals.
7. The automatic test method for the low-temperature performance of the partial discharge sensor according to claim 6, which is characterized in that: the preset humidity level in the first step, the preset temperature level in the second step and the test duration at the preset temperature in the third step are all set through an upper computer and are written into a control unit through a program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211390261.XA CN115856743A (en) | 2022-11-08 | 2022-11-08 | Automatic testing system and method for low-temperature performance of partial discharge sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211390261.XA CN115856743A (en) | 2022-11-08 | 2022-11-08 | Automatic testing system and method for low-temperature performance of partial discharge sensor |
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| CN115856743A true CN115856743A (en) | 2023-03-28 |
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| CN202211390261.XA Pending CN115856743A (en) | 2022-11-08 | 2022-11-08 | Automatic testing system and method for low-temperature performance of partial discharge sensor |
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