High voltage dry load test equipment and devices

Abstract

The present invention discloses a high-voltage dry load test device and equipment, the device comprises: an acquisition unit, a detection unit and a control unit, wherein the acquisition unit is used to acquire the withstand voltage coefficient and withstand current coefficient of a single resistor for connecting to a high-voltage power supply; the detection unit is used to detect the voltage level of the high-voltage power supply; the control unit is connected to the acquisition unit and the detection unit respectively, and the control unit is used to determine the minimum number of resistor modules connected according to the voltage level, withstand voltage coefficient and withstand current coefficient, and control the corresponding number of resistor modules to connect to the high-voltage power supply for load testing. The present invention has the characteristics of high strength, good insulation, high safety, and a wide voltage application range, and can extend the service life of the resistor.

Description

Technical Field

[0001] The invention relates to the technical field of load test device design, and in particular to a high-voltage dry load test device and equipment. Background Art

[0002] At present, medium and high voltage generator sets are used in certain specific occasions, and dry medium and high voltage load devices are usually used for load tests. The resistor in the load device is connected to a medium and high voltage voltage, and the resistor tube converts the electrical energy into heat energy, and then cooperates with a high-efficiency fan to discharge the heat. Although the resistor is designed with a certain overload capacity and the largest possible insulation characteristics, most of them are very limited. Long-term use will affect the aging of the resistor, thereby reducing the insulation characteristics and shortening the life. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the first object of the present invention is to provide a high voltage dry load test device, which has the characteristics of high strength, good insulation, high safety, wide voltage application range, and can extend the service life of the resistor.

[0004] A second object of the present invention is to provide a high-voltage dry load test device.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A high-voltage dry load test device, comprising:

[0007] An acquisition unit, used for acquiring a withstand voltage coefficient and a withstand current coefficient of a single resistor for connecting to a high voltage power supply;

[0008] A detection unit, used to detect the voltage level of the high voltage power supply;

[0009] A control unit is connected to the acquisition unit and the detection unit respectively, and the control unit is used to determine the minimum number of connected resistor modules according to the voltage level, the withstand voltage coefficient and the withstand current coefficient, and control a corresponding number of resistor modules to be connected to the high voltage power supply for load testing.

[0010] Optionally, the device further includes: a plurality of the resistor modules, wherein each of the resistor modules is formed by connecting the same number of resistors with the same resistance value in parallel.

[0011] Optionally, each of the resistance modules is connected in series with the high voltage power supply in sequence.

[0012] Optionally, the control unit is further used to determine the maximum number of resistors connected in each resistor module according to the voltage level, the voltage resistance coefficient and the current resistance coefficient, so that the dissipated power of each resistor module reaches a preset dissipated power.

[0013] Optionally, the device further includes: a high-voltage contactor, which is respectively connected to the control unit and the series-connected resistor module, and the control unit controls the high-voltage contactor to close so as to connect the series-connected resistor module to the high-voltage power supply.

[0014] Optionally, the device further includes: a high-voltage fuse, one end of which is connected to the high-voltage power supply, and the other end of which is connected to the high-voltage contactor, and the high-voltage fuse is used to provide high-voltage protection for the corresponding load test branch.

[0015] Optionally, the device further comprises: a test cavity, wherein a composite insulating mounting board is provided on one side of the test cavity, and a plurality of the resistance modules are arranged on the composite insulating mounting board for performing a load test.

[0016] Optionally, the device further includes: a fan, disposed in the test cavity, and configured to dissipate heat from the resistor module in the test cavity.

[0017] Optionally, the device further comprises: a temperature detection unit, disposed in the test cavity, the temperature detection unit being used to detect the temperature in the test cavity;

[0018] Wherein, the control unit is also connected to the temperature detection unit and the fan respectively, and the control unit is used to obtain the temperature value in the test chamber through the temperature detection unit, and when the temperature value reaches a first threshold, control the fan to run at a first speed, and when the temperature value reaches a second threshold, control the fan to run at a second speed, wherein the first threshold is less than the second threshold, and the first speed is less than the second speed.

[0019] To achieve the above objective, the second aspect of the present invention further provides a high-voltage dry load test device.

[0020] The present invention has at least the following technical effects:

[0021] The present invention obtains the withstand voltage coefficient and withstand current coefficient of a single resistor for connecting to a high-voltage power supply, detects the voltage level of the high-voltage power supply, determines the minimum connection number of the resistor module according to the voltage level, the withstand voltage coefficient and the withstand current coefficient, and controls the corresponding number of resistor modules to connect to the high-voltage power supply for load testing, so that the resistors in the resistor module always work at their rated parameter state, thereby effectively preventing the aging of the resistors in the resistor module, extending the service life of the resistor module, and making the device have the characteristics of a wide range of voltage level applications; in addition, the present invention determines the maximum connection number of a single resistor in the resistor module through the above parameters, so that the dissipated power of the resistor module meets the preset dissipated power under the premise that the resistors in the resistor module always work at their rated parameter state, that is, the power capacity of the resistor module can be increased and the preset power capacity can be reached by connecting the minimum number of resistors in parallel, thereby meeting the power consumption demand; and using the composite insulating board as the mounting board of the resistor module can improve the strength, insulation and safety of the device.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural block diagram of a high-voltage dry load test device provided by an embodiment of the present invention;

[0024] Figure 2 A circuit topology diagram of a high voltage dry load test device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the arrangement of a fan and a resistor module provided in one embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the installation of a resistor tube provided in one embodiment of the present invention;

[0027] Figure 5 This is a structural block diagram of a high-voltage dry load test device provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present embodiment is described in detail below, and examples of the embodiment are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The high-voltage dry load test device and apparatus of this embodiment will be described below with reference to the accompanying drawings.

[0030] Figure 1This is a structural block diagram of a high-voltage dry load test device provided by an embodiment of the present invention. Figure 1 As shown, the high-voltage dry load test device 10 includes: an acquisition unit 11 , a detection unit 12 and a control unit 13 .

[0031] Among them, the acquisition unit 11 is used to obtain the withstand voltage coefficient and withstand current coefficient of a single resistor used to connect to a high-voltage power supply; the detection unit 12 is used to detect the voltage level of the high-voltage power supply; the control unit 13 is connected to the acquisition unit 11 and the detection unit 12 respectively, and the control unit 13 is used to determine the minimum connection number of the resistor module according to the voltage level, withstand voltage coefficient and withstand current coefficient, and control the corresponding number of resistor modules to connect to the high-voltage power supply for load testing.

[0032] The high-voltage dry load test device 10 further includes a plurality of resistor modules, wherein each resistor module is formed by connecting the same number of resistors with the same resistance in parallel, and each resistor module is connected in series with a high-voltage power supply in sequence.

[0033] like Figure 2 As shown, the high-voltage power supply in this embodiment can be a three-phase high-voltage power supply, wherein a plurality of resistors can be selected for hybrid connection, and then divided into three groups and respectively connected to each phase power output terminal of the three-phase high-voltage power supply in turn, so as to perform a load test on the three-phase high-voltage power supply, that is, the electric energy output by the three-phase high-voltage power supply is converted into heat energy through the multiple hybrid resistors, so as to achieve the purpose of the load test.

[0034] In order to protect any resistor in the load test, in this embodiment, the voltage resistance coefficient and current resistance coefficient of each resistor can be obtained by the acquisition unit 11, and then the voltage level of the high-voltage power supply can be obtained by the detection unit 12. The control unit 13 then determines the minimum number of connected resistor modules according to the voltage-dividing characteristics of the series resistors, and connects the minimum number of connected resistor modules to the high-voltage power supply.

[0035] For example, the voltage value corresponding to the voltage level of the high-voltage power supply is 220V. Since the resistor module in this embodiment is composed of multiple resistors in parallel, the voltage after the resistor module is split needs to meet the withstand voltage coefficient of each parallel resistor. For example, the withstand voltage coefficient of each resistor is 100V, the resistance value is 60Ω, and the current resistance coefficient is 1A. When two resistor modules are connected in series, the voltage across each resistor module is 110V, which is obviously greater than 100V, so the control unit 13 also needs to control the addition of a resistor module. When the number of resistor modules connected is 3, the voltage across each resistor module is about 73V, and the current value of a single resistor in each resistor module is obviously greater than 1A. At this time, the control unit 13 also controls the addition of a resistor module. When the number of resistor modules connected is 4, the current flowing through each resistor in each resistor module can be made less than 1A. Therefore, it can be determined that the minimum number of resistor modules connected under this voltage level is 4, and then the 4 resistor modules are connected in series in sequence to the high-voltage power supply output end of the corresponding phase.

[0036] In one embodiment of the present invention, the control unit 13 is further used to determine the maximum number of resistors connected in each resistor module according to the voltage level, the withstand voltage coefficient and the withstand current coefficient, so that the dissipated power of each resistor module reaches the preset dissipated power.

[0037] In order to improve the power capacity of each resistor module, as described above, multiple resistors can be connected in parallel to form the resistor module. When the power dissipation on each resistor module is too large, the aging rate of the resistors in the resistor module will inevitably be accelerated. Therefore, in the case of meeting the power consumption requirements, it is also necessary to set a preset power dissipation, that is, each resistor module has a preset power capacity. The use of a resistor module with a preset power capacity can further prevent the aging of each resistor in the resistor module.

[0038] Specifically, after determining the number of connected resistor modules, the control unit 13 can further determine the maximum number of resistors connected in each resistor module. For example, as mentioned above, the minimum number of resistor modules connected at a voltage level of 220V is 4. At this time, the voltage across each resistor module is 55V. Then, the maximum number of resistors connected in each resistor module can be determined based on the preset dissipated power and the voltage across each resistor module. For example, if the preset dissipated power is 1KW, the total resistance of the resistor module is required to be greater than 3Ω. When the single resistor is 6Ω, the maximum number of single resistors that need to be connected is 2, thereby ensuring that the dissipated power of the resistor module reaches and does not exceed 1KW, thereby further preventing the aging of each resistor in the resistor module.

[0039] like Figure 2 As shown, the device further includes a high-voltage contactor, which is connected to the control unit 13 and the series-connected resistor modules respectively. The control unit 13 controls the high-voltage contactor to close so as to connect the series-connected resistor modules to the high-voltage power supply.

[0040] Specifically, after determining the number of connected single resistors and the number of connected resistor modules in the power module, the control unit 13 can control the high-voltage contactor to connect a corresponding number of resistor modules to the high-voltage power supply.

[0041] Among them, a high-voltage fuse is also arranged between the high-voltage power supply of the busbar and the high-voltage contactor, and the high-voltage fuse can be used to provide high-voltage protection for the corresponding load test branch.

[0042] It should be noted that the high-voltage components in this embodiment, such as high-voltage power supply, high-voltage contactor, high-voltage fuse, etc., can also be installed on brackets to ensure that electrical insulation and creepage distance comply with high-voltage electrical specifications.

[0043] like Figure 3 As shown, the device also includes a test chamber, wherein a composite insulating mounting plate is provided on one side of the test chamber, and a plurality of resistor modules are provided on the composite insulating mounting plate for load testing. In addition, a fan is also provided in the test chamber, and the fan can be used to dissipate heat from the resistor modules in the test chamber.

[0044] Specifically, the test chamber is composed of a resistance sealing plate, an exhaust grille plate and a composite insulation mounting plate, wherein Figure 4 As shown, a plurality of through holes are evenly provided on the composite insulating mounting plate, and a plurality of resistance tubes formed by a plurality of resistors are respectively plugged into the corresponding through holes and fixed on the composite insulating mounting plate, wherein the plurality of resistance tubes constitute the resistance module described above. A fan is arranged below the test cavity, and the fan is specifically arranged in another cavity sealed by an air inlet grid plate and other partitions, and the fan is powered by a three-phase AC power supply. In this embodiment, the composite insulating mounting plate has thermal insulation and electrical insulation properties. The arrangement of the composite insulating mounting plate can improve the strength, insulation and safety of the device, and the resistance tubes are evenly arranged on the through holes, which can facilitate maintenance by the staff.

[0045] In addition, the device also includes: a temperature detection unit, which is arranged in the test chamber, and the temperature detection unit is used to detect the temperature in the test chamber; wherein the control unit 13 is also connected to the temperature detection unit and the fan respectively, and the control unit 13 is used to obtain the temperature value in the test chamber through the temperature detection unit, and when the temperature value reaches a first threshold, control the fan to run at a first speed, and when the temperature value reaches a second threshold, control the fan to run at a second speed, wherein the first threshold is less than the second threshold, and the first speed is less than the second speed.

[0046] Specifically, the temperature detection unit can detect the temperature in the test cavity. When the temperature reaches a first threshold value, such as 25°C, the control unit 13 can control the fan to run at 3000r / min. The fan blows the air sent from the air inlet grid into the test cavity and discharges the heat generated by the resistor tube from the exhaust grid. When the temperature reaches a second threshold value, such as 40°C, the control unit 13 can control the fan to run at 5000r / min to accelerate the discharge of heat in the test cavity. When the temperature detection unit detects that the temperature value is always greater than a fixed value and continues to increase, the control unit 13 can also control the buzzer or display to issue a fault warning prompt message so that the staff can promptly check whether the resistor tube or fan is faulty and perform maintenance in a timely manner.

[0047] Furthermore, the present invention also provides a high-voltage dry load test device, such as Figure 5 As shown, the high-voltage dry load test equipment 100 includes the high-voltage dry load test device 10 described above.

[0048] In summary, the present invention obtains the withstand voltage coefficient and withstand current coefficient of a single resistor for connecting to a high-voltage power supply, detects the voltage level of the high-voltage power supply, determines the minimum connection number of the resistor module according to the voltage level, the withstand voltage coefficient and the withstand current coefficient, and controls the corresponding number of resistor modules to connect to the high-voltage power supply for load testing, so that the resistors in the resistor module always work at their rated parameter state, thereby effectively preventing the aging of the resistors in the resistor module, extending the service life of the resistor module, and making the device have the characteristics of a wide range of voltage level applications; in addition, the present invention determines the maximum connection number of a single resistor in the resistor module through the above parameters, so that the dissipated power of the resistor module meets the preset dissipated power on the premise that the resistors in the resistor module always work at their rated parameter state, that is, the power capacity of the resistor module can be increased and the preset power capacity can be reached by connecting the minimum number of resistors in parallel, thereby meeting the energy consumption requirements; and using the composite insulating board as the mounting board of the resistor module can improve the strength, insulation and safety of the device.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A high-voltage dry load test device, characterized in that: include: An acquisition unit, used for acquiring a withstand voltage coefficient and a withstand current coefficient of a single resistor for connecting to a high voltage power supply; A detection unit, used to detect the voltage level of the high voltage power supply; A plurality of resistor modules, each of which is formed by connecting the same number of resistors with the same resistance value in parallel; A control unit is connected to the acquisition unit and the detection unit respectively, and the control unit is used to determine the minimum number of connected resistor modules according to the voltage level, the withstand voltage coefficient and the withstand current coefficient, and control a corresponding number of resistor modules to be connected in series with the high-voltage power supply in sequence to perform a load test; the control unit is also used to determine the maximum number of connected resistors in each resistor module according to the voltage level, the withstand voltage coefficient and the withstand current coefficient, so that the dissipated power of each resistor module reaches a preset dissipated power.

2. The high-voltage dry load test device according to claim 1, characterized in that: Also includes: The high-voltage contactor is connected to the control unit and the series-connected resistor module, respectively. The control unit controls the high-voltage contactor to close so as to connect the series-connected resistor module to the high-voltage power supply.

3. The high-voltage dry load test device according to claim 2, characterized in that: Also includes: A high-voltage fuse, one end of which is connected to the high-voltage power supply, and the other end of which is connected to the high-voltage contactor, and the high-voltage fuse is used to provide high-voltage protection for the corresponding load test branch.

4. The high-voltage dry load test device according to claim 3, characterized in that: Also includes: A test cavity, wherein a composite insulating mounting plate is arranged on one side of the test cavity, and a plurality of the resistance modules are arranged on the composite insulating mounting plate for load testing.

5. The high-voltage dry load test device according to claim 4, characterized in that: Also includes: A fan is arranged in the test cavity, and is used to dissipate heat for the resistance module in the test cavity.

6. The high-voltage dry load test device according to claim 5, characterized in that: Also includes: A temperature detection unit is disposed in the test cavity, and is used to detect the temperature in the test cavity; Wherein, the control unit is also connected to the temperature detection unit and the fan respectively, and the control unit is used to obtain the temperature value in the test chamber through the temperature detection unit, and when the temperature value reaches a first threshold, control the fan to run at a first speed, and when the temperature value reaches a second threshold, control the fan to run at a second speed, wherein the first threshold is less than the second threshold, and the first speed is less than the second speed.

7. A high-voltage dry load test device, characterized in that: The invention comprises a high-voltage dry load test device as claimed in any one of claims 1 to 6.

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