CN214041617U - Direct current cable insulation test system - Google Patents
Direct current cable insulation test system Download PDFInfo
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- CN214041617U CN214041617U CN202022636641.XU CN202022636641U CN214041617U CN 214041617 U CN214041617 U CN 214041617U CN 202022636641 U CN202022636641 U CN 202022636641U CN 214041617 U CN214041617 U CN 214041617U
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Abstract
The utility model discloses a direct current cable insulation test system relates to a cable test field. At present, signals measured by a direct current cable insulation diagnosis and evaluation device are often single, and the insulation condition of a direct current cable system cannot be evaluated accurately and comprehensively. The utility model comprises an optical fiber temperature measuring unit, an environment control unit, a wire core temperature control unit, a direct current high voltage applying unit, a space charge measuring unit, a leakage current measuring unit, a partial discharge measuring unit and a control host connected with the units; the control host is provided with a temperature control module, a simulated working condition module, a multi-working condition operation parameter calculation module and a simulated defect module; according to the technical scheme, a plurality of key characteristic parameters representing the insulation state of the direct current cable can be collected, the comprehensiveness is high, the defect that the insulation state is analyzed through a single parameter is overcome, and the obtained data more directly and truly reflect the actual insulation state information of the direct current cable.
Description
Technical Field
The utility model relates to a cable test field especially relates to a direct current cable insulation test system.
Background
The insulation state diagnosis and the performance evaluation of the high-voltage direct-current cable in the operation and maintenance process are important for guaranteeing the safe operation of the direct-current transmission line. At present, signals measured by a direct current cable insulation diagnosis and evaluation device are single, and the insulation condition of the direct current cable is analyzed from the angle of single parameter change such as space charge, partial discharge, leakage current and the like. However, these operating parameters have a correlation, and the insulation condition of the dc cable system cannot be accurately and comprehensively evaluated only by using a single parameter. Therefore, it is necessary to research insulation diagnosis and performance test methods for multi-parameter based dc cable systems.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model and the technical task who provides are perfect and improve prior art scheme, provide a direct current cable insulation test system to reach the comprehensive diagnosis of direct current cable and test purpose. Therefore, the utility model adopts the following technical scheme.
A direct current cable insulation test system comprises two sections of tested cable samples with the same type, wherein one section is a test cable, and the other section is a simulation cable; a direct-current high-voltage applying unit for applying direct-current high voltage to the test cable is arranged between the two ends of the test cable, and a test loop is formed; two ends of the simulation cable are short-circuited to form a simulation loop; each layer of simulation cable is equipped with temperature sensor, and the surface of test cable is equipped with temperature sensor, still includes:
an optical fiber temperature measuring unit: the device comprises an optical fiber wound outside a test cable and used for measuring the temperature of an outer protective layer of the test cable;
an environment control unit: the temperature control device is used for controlling the external environment temperature of the cable;
a wire core temperature control unit: the device comprises a current booster, a current transformer and a temperature sensor, wherein the current booster and the current transformer are arranged on a test cable and a simulation cable, and the temperature sensor is used for collecting the temperature of the test cable and the simulation cable;
space charge measurement unit: the device is arranged in a microclimate room and used for measuring the space charge of the test cable;
a leakage current measuring unit: the device is used for measuring the leakage current of the test cable;
partial discharge measurement unit: the device is used for measuring the partial discharge value of the test cable;
the control host computer: the device is connected with the optical fiber temperature measuring unit, the environment control unit, the wire core temperature control unit, the direct current high voltage applying unit, the space charge measuring unit, the leakage current measuring unit and the partial discharge measuring unit to obtain information and control the information. Adopting a simulation cable with the same model as the test cable and thermocouple temperature measurement on each layer as a temperature reference, measuring the temperature distribution of each layer of the simulation loop, indirectly acquiring the conductor temperature of the test cable, and simulating the basis of controlling the temperature of the test cable by the temperature action of the cable; the simulation loop is arranged, so that the insulation of the test cable can not be damaged, the test cable is close to the actual test cable, and the authenticity and the accuracy of the measurement result of the charge distribution in the insulation space of the direct current cable are improved. According to the technical scheme, space charge measurement, leakage current measurement and partial discharge measurement are integrated, and the insulation state of the cable can be comprehensively obtained from multiple dimensions. Meanwhile, the environment control unit and the wire core temperature control unit are arranged, so that temperature information can be better obtained, and the insulation temperature difference can be accurately controlled.
As a preferable technical means: the environment control unit adopts a microclimate chamber, part of the test cables and part of the simulation cables are positioned in the microclimate chamber, and the environment control unit controls the temperature of the microclimate chamber. The microclimate chamber is adopted, so that the indoor temperature is more uniform and accurate, the temperature is adjusted more quickly, and the working accuracy is improved. The microclimate room can realize that the indoor air temperature is adjustable at 20-60 ℃, and the external environment temperature of the cable is accurately controlled.
As a preferable technical means: the space charge measuring unit is arranged in the microclimate room and used for measuring space charge information of a test cable in the microclimate room. The accuracy of space charge measurement is improved, space charge measurement can adopt a space charge test electrode, and a laser pressure wave method space charge test system is utilized to carry out space charge measurement on a real cable instead of an insulation slice.
As a preferable technical means: the temperature sensors are arranged on a test cable and a simulation cable in the microclimate room and used for collecting temperature information of the test cable and the simulation cable; the optical fiber of the optical fiber temperature measuring unit is positioned on a test cable outside the microclimate chamber. The test cables are measured at different positions and in different modes, and can be used as mutual reference, so that the test accuracy is improved, and the tests of different projects are facilitated.
As a preferable technical means: punching a plurality of positions on the simulation cable, wherein the punching depth comprises a conductor layer, an insulating layer and a filling layer, and a temperature sensor is arranged at the punching position; the temperature measuring range of the temperature sensor arranged on the analog cable covers the conductor layer, the insulating layer, the filling layer and the outer skin; a temperature sensor is arranged at the outer surface skin of the test cable; the temperature state of each structural layer of the simulation cable is monitored in real time through the temperature sensor, the temperature of the simulation cable is consistent with that of the test cable under the same condition, and the insulation temperature of the simulation cable is the insulation temperature of the test cable.
As a preferable technical means: the method is characterized in that: the simulation cable is sheathed with 1 current booster and 1 current transformer; a plurality of current risers and 1 current transformer are arranged on the test cable; stress cones are arranged at two ends of the test cable; the direct-current high-voltage applying unit is arranged between the two stress cones; the two ends of the analog cable are butted through a short-circuit terminal to form an analog loop. The number of current boosters arranged on the test cable is different from that of current boosters arranged on the simulation cable, so that different test items can be carried out on the test cable while the test cost is reduced.
Has the advantages that:
according to the technical scheme, a plurality of key characteristic parameters representing the insulation state of the direct current cable can be collected, the comprehensiveness is high, the defect that the insulation state is analyzed by a single parameter is overcome, and more accurate direct current cable insulation actual state information is obtained.
Drawings
Fig. 1 is a structural block diagram of the present invention, and the structural schematic diagram of the present invention.
Fig. 2 is a working principle diagram of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
As shown in figure 1, the utility model discloses an optic fibre temperature measurement unit, environmental control unit, sinle silk temperature control unit, direct current high pressure apply unit, space charge measuring unit, leakage current measuring unit, partial discharge measuring unit and the main control system who links to each other with above-mentioned unit.
The arrangement, action, and the like of each unit are further explained below.
As shown in fig. 2, the utility model uses two tested cable samples with the same model to carry out the test, wherein one section is a test cable and the other section is a simulation cable; a direct-current high-voltage applying unit for applying direct-current high voltage to the test cable is arranged between the two ends of the test cable, and a test loop is formed; two ends of the simulation cable are short-circuited to form a simulation loop; each layer of the simulation cable is provided with a temperature sensor, the surface of the test cable is provided with the temperature sensor, a plurality of positions on the simulation cable are punched, the punching depth comprises a conductor layer, an insulating layer and a filling layer, and the temperature sensors are arranged at the punching positions; the temperature measuring range of the temperature sensor arranged on the analog cable covers the conductor layer, the insulating layer, the filling layer and the outer skin; a temperature sensor is arranged at the outer surface skin of the test cable; the temperature state of each structural layer of the simulation cable is monitored in real time through the temperature sensor, the temperature of the simulation cable is consistent with that of the test cable under the same condition, and the insulation temperature of the simulation cable is the insulation temperature of the test cable.
An optical fiber temperature measuring unit: the device comprises an optical fiber wound outside a test cable and used for measuring the temperature of an outer protective layer of the test cable. The optical fiber of the optical fiber temperature measuring unit is positioned on a test cable outside the microclimate chamber. The test cables are measured at different positions and in different modes, and can be used as mutual reference, so that the test accuracy is improved, and the tests of different projects are facilitated.
An environment control unit: the environment control unit adopts a microclimate chamber, part of the test cables and part of the simulation cables are positioned in the microclimate chamber, and the environment control unit controls the temperature of the microclimate chamber. The microclimate chamber is adopted, so that the indoor temperature is more uniform and accurate, the temperature is adjusted more quickly, and the working accuracy is improved. The microclimate room can realize that the indoor air temperature is adjustable at 20-60 ℃, and the external environment temperature of the cable is accurately controlled.
A wire core temperature control unit: the device comprises a current booster, a current transformer and a temperature sensor, wherein the current booster and the current transformer are arranged on a test cable and a simulation cable, and the temperature sensor is used for collecting the temperature of the test cable and the simulation cable; the temperature sensors are arranged on the test cable and the simulation cable in the microclimate room and used for collecting temperature information of the test cable and the simulation cable.
Space charge measurement unit: which is provided in a microclimate chamber for measuring space charge information of a test cable in the microclimate chamber. The accuracy of space charge measurement is improved, and the space charge measurement utilizes an electroacoustic pulse method to carry out space charge measurement on a real cable instead of an insulation slice.
A leakage current measuring unit: for measuring the test cable leakage current.
Partial discharge measurement unit: the device is used for measuring the partial discharge value of the test cable.
The control host computer: the device is connected with the optical fiber temperature measuring unit, the environment control unit, the wire core temperature control unit, the direct current high voltage applying unit, the space charge measuring unit, the leakage current measuring unit and the partial discharge measuring unit to obtain information.
Adopting a simulation cable with the same model as the test cable and thermocouple temperature measurement on each layer as a temperature reference, measuring the temperature distribution of each layer of the simulation loop, indirectly acquiring the conductor temperature of the test cable, and simulating the basis of controlling the temperature of the test cable by the temperature action of the cable; the simulation loop is arranged, so that the insulation of the test cable can not be damaged, the test cable is close to the actual test cable, and the authenticity and the accuracy of the measurement result of the charge distribution in the insulation space of the direct current cable are improved. According to the technical scheme, space charge measurement, leakage current measurement and partial discharge measurement data are integrated, and the insulation state of the cable can be comprehensively evaluated from multiple dimensions. Meanwhile, the environment control unit and the wire core temperature control unit are arranged, so that the accurate control of insulation temperature difference can be realized, the correlation between different insulation operation parameters of the cable and temperature gradients is deduced from the above, and a reliable basis is provided for the operation condition evaluation and operation and maintenance of the insulated high-voltage direct-current cable system.
The cost is reduced while different tests are adapted; the simulation cable is sheathed with 1 current booster and 1 current transformer; a plurality of current risers and 1 current transformer are arranged on the test cable; stress cones are arranged at two ends of the test cable; the direct-current high-voltage applying unit is arranged between the two stress cones; the two ends of the analog cable are butted through a short-circuit terminal to form an analog loop. The number of current boosters arranged on the test cable is different from that of current boosters arranged on the simulation cable, so that different test items can be carried out on the test cable while the test cost is reduced.
The dc cable insulation test system shown in fig. 1 and 2 is a specific embodiment of the present invention, and embodies the substantial features and advantages of the present invention, and can perform equivalent modifications in the aspects of shape, structure, etc. according to the practical needs of use, all within the scope of protection of the present solution.
Claims (6)
1. A direct current cable insulation test system comprises two sections of tested cable samples with the same type, wherein one section is a test cable, and the other section is a simulation cable; a direct-current high-voltage applying unit is arranged between the two ends of the test cable and forms a test loop, and the direct-current high-voltage applying unit is used for applying direct-current high-voltage electricity to the test cable; two ends of the simulation cable are short-circuited to form a simulation loop; each layer of simulation cable is equipped with temperature sensor, and the surface of test cable is equipped with temperature sensor, and its characterized in that still includes:
an optical fiber temperature measuring unit: the device comprises an optical fiber wound outside a test cable and used for measuring the temperature of an outer protective layer of the test cable;
an environment control unit: the temperature control device is used for controlling the external environment temperature of the cable;
a wire core temperature control unit: the device comprises a current booster, a current transformer and a temperature sensor, wherein the current booster and the current transformer are arranged on a test cable and a simulation cable, and the temperature sensor is used for collecting the temperature of the test cable and the simulation cable;
space charge measurement unit: the device is used for measuring the space charge of the test cable;
a leakage current measuring unit: the device is used for measuring the leakage current of the test cable;
partial discharge measurement unit: the device is used for measuring the partial discharge value of the test cable;
the control host computer: the device is connected with the optical fiber temperature measuring unit, the environment control unit, the wire core temperature control unit, the direct current high voltage applying unit, the space charge measuring unit, the leakage current measuring unit and the partial discharge measuring unit to obtain information.
2. A dc cable insulation test system according to claim 1, wherein: the environment control unit is provided with a microclimate chamber, a part of the test cables and a part of the simulation cables are positioned in the microclimate chamber, and the environment control unit controls the temperature of the microclimate chamber.
3. A dc cable insulation test system according to claim 2, wherein: the space charge measuring unit is arranged in the microclimate room and used for measuring space charge information of a test cable in the microclimate room.
4. A dc cable insulation test system according to claim 3, wherein: the temperature sensors are arranged on a test cable and a simulation cable in the microclimate room and used for collecting temperature information of the test cable and the simulation cable; the optical fiber of the optical fiber temperature measuring unit is positioned on a test cable outside the microclimate chamber.
5. A DC cable insulation test system according to claim 4, wherein: punching a plurality of positions on the simulation cable, wherein the punching depth comprises a conductor layer, an insulating layer and a filling layer, and a temperature sensor is arranged at the punching position; the temperature measuring range of the temperature sensor arranged on the analog cable covers the conductor layer, the insulating layer, the filling layer and the outer skin; a temperature sensor is arranged at the outer surface skin of the test cable; the temperature state of each structural layer of the simulation cable is monitored in real time through the temperature sensor, the temperature of the simulation cable is consistent with that of the test cable under the same condition, and the insulation temperature of the simulation cable is the insulation temperature of the test cable.
6. A DC cable insulation test system according to claim 5, wherein: the simulation cable is sheathed with 1 current booster and 1 current transformer; a plurality of current risers and 1 current transformer are arranged on the test cable; stress cones are arranged at two ends of the test cable; the direct-current high-voltage applying unit is arranged between the two stress cones; the two ends of the analog cable are butted through a short-circuit terminal to form an analog loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022636641.XU CN214041617U (en) | 2020-11-13 | 2020-11-13 | Direct current cable insulation test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022636641.XU CN214041617U (en) | 2020-11-13 | 2020-11-13 | Direct current cable insulation test system |
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| Publication Number | Publication Date |
|---|---|
| CN214041617U true CN214041617U (en) | 2021-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022636641.XU Active CN214041617U (en) | 2020-11-13 | 2020-11-13 | Direct current cable insulation test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214041617U (en) |
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2020
- 2020-11-13 CN CN202022636641.XU patent/CN214041617U/en active Active
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