Electric appliance reliability experiment system
By using controllable energy storage power, feedback load and voltage regulating transformer in electrical reliability detection systems, the problems of large power supply capacity, high energy consumption and excessive initial current in traditional inspection are solved, and small capacity and low energy consumption detection is achieved, reducing production costs.
Patent Information
- Application Number
- CN202510250023.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2025-05-23
AI Technical Summary
In traditional electrical reliability testing, a large capacity power supply is required when using resistive loads, resulting in large power loss. Moreover, due to the small power capacity of electrical appliances, electrical appliance manufacturers are prone to excessive initial current and tripping of the main protection switch, which cannot be detected by themselves, and need to send it to the detection mechanism, which is costly.
Controllable energy storage power, feedback load and voltage regulation transformer are adopted to achieve voltage boost and step-down through voltage regulation transformer, reduce power capacity requirements, reduce energy consumption, and control the output controllable energy storage power supply synchronizes with the power grid through switches to avoid excessive initial current.
It realizes the small capacity power supply and low energy consumption required for electrical reliability detection, avoids the phenomenon of tripping of the main protection switch, reduces production costs, and facilitates electrical appliance manufacturers and testing agencies to conduct inspections.
Smart Images
Figure CN120028626A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of electrical appliance detection, in particular to an electrical appliance reliability experiment system. Background Art
[0002] When testing electrical equipment for reliability items such as temperature rise and on-off, using traditional resistive loads requires a larger capacity power supply, and the energy loss in the test circuit is large. However, most electrical equipment manufacturers have small power supply capacity, and during the initial use process, the initial current is too large and the main protection switch trips. As a result, they are unable to perform reliability tests on their electrical equipment themselves and must send them to professional testing agencies for testing, which results in high production costs. Summary of the invention
[0003] The purpose of the present invention is to provide an electrical reliability test system. The present invention uses a controllable energy storage power supply, a feedback load and a voltage regulating transformer, so that the power capacity required by the experimental system is small and the energy consumption is low, which is convenient for electrical appliance manufacturers and testing institutions to conduct reliability tests on electrical appliances.
[0004] To achieve the above object, the technical solution adopted by the present invention is: An electrical reliability test system comprises a switch QF, a voltage regulating transformer T1, a feedback load FL, and an isolation transformer T2 which are connected in series in sequence, wherein the incoming line end of the switch QF is connected to a power grid, and the output end of the isolation transformer T2 is connected to the power grid; the output end of the power grid is connected to an output controllable energy storage power supply, and the output end of the output controllable energy storage power supply is connected to the incoming line end of the switch QF; a test piece S1 is connected between the voltage regulating transformer T1 and the feedback load FL; when the voltage required by the test piece S1 is higher than the voltage provided by the power grid, the primary side of the voltage regulating transformer T1 is connected to the switch QF, the secondary side is connected to the test piece S1, and the voltage input from the power grid is boosted by the voltage regulating transformer T1 and then transmitted to the test piece S1; when the voltage required by the test piece S1 is lower than the voltage provided by the power grid, the secondary side of the voltage regulating transformer T1 is connected to the switch QF, the primary side is connected to the test piece S1, and the voltage input from the power grid is stepped down by the voltage regulating transformer T1 and then transmitted to the test piece S1.
[0005] Preferably, the voltage-regulating transformer T1 is a transformer with multiple windings on the secondary side and multiple taps on the primary side. The secondary windings of the voltage-regulating transformer T1 can achieve different output voltages through different combinations of series or parallel connection. Different configurations of the primary side taps of the voltage-regulating transformer T1 can achieve fine-tuning of the output voltage of the voltage-regulating transformer T1.
[0006] Preferably, the output controllable energy storage power supply is an LC oscillator, the frequency of the LC oscillator is 50 Hz or 60 Hz, and the current output by the LC oscillator is a sine wave with the same frequency as the power grid.
[0007] A temperature rise test method for a switch electrical appliance, which is completed by relying on the above electrical appliance reliability test system, comprises the following steps: Step 1: disconnect the switch QF, adjust the size of the feedback load FL according to the test requirements of the test product S1, and charge the output controllable energy storage power supply; Step 2: After the output controllable energy storage power supply is fully charged, turn on the switch QF and connect the test product S1 to the experimental system. The power grid provides a stable power supply to the test product S1, and the current returns to the power grid after passing through the feedback load FL and the isolation transformer T2. The state of the test product S1 is monitored and recorded. At this time, only the feedback load FL consumes power in the experimental system.
[0008] A switch electrical appliance on-off test method, which is completed by relying on the above electrical appliance reliability test system, comprises the following steps: Step 1: First, disconnect the switch QF, adjust the size of the feedback load FL according to the test requirements of the test product S1, and charge the output controllable energy storage power supply; Step 2: After the output controllable energy storage power source is fully charged, the switch QF is turned on, and the test sample S1 is connected to the experimental system. The power grid provides a stable power supply to the test sample S1, and the current returns to the power grid after passing through the feedback load FL and the isolation transformer T2. The state of the test sample S1 is monitored and recorded; Step 3. During the test, the output controllable energy storage power supply supplements the peak current of the experimental system. At the 100ms moment after the first on-off of the test product S1, the output controllable energy storage power supply stops outputting, and the output controllable energy storage power supply is connected to the grid to start charging; at the same moment when the second on-off of the test product S1 starts, the output controllable energy storage power supply stops charging, and the output end of the output controllable energy storage power supply is connected to the switch QF to supplement the peak current of the experimental system. At the 100ms moment after the second on-off of the test product S1 starts, the output controllable energy storage power supply stops outputting again, and the output controllable energy storage power supply is connected to the grid again to start charging; this cycle is repeated until the end of the test.
[0009] Compared with the prior art, the present invention has the following beneficial effects: In the experimental system described in the present invention, the test sample S1 is connected between the voltage regulating transformer T1 and the feedback load FL. When the voltage required by the test sample S1 is higher than the voltage provided by the power grid, the primary side of the voltage regulating transformer T1 is connected to the switch QF, and the secondary side is connected to the test sample S1, and the voltage regulating transformer T1 plays a role of boosting and isolating; when the voltage required by the test sample S1 is lower than the voltage provided by the power grid, the secondary side of the voltage regulating transformer T1 is connected to the switch QF, and the primary side is connected to the test sample S1, and the voltage regulating transformer T1 plays a role of reducing and isolating; In the experimental system described in the present invention, the secondary winding of the voltage regulating transformer T1 is connected in series or in parallel in different combinations, and the secondary winding is connected in star or triangle to achieve a wide range of adjustment of the voltage step-up and step-down of the voltage regulating transformer T1, and can output a wide range of output voltage; different configurations of the primary side taps of the voltage regulating transformer T1 can achieve fine adjustment of the output voltage of the voltage regulating transformer T1; the test voltage of the test product is covered from 18V to 8729V, and can be used for reliability tests of the corresponding voltage range of transformers and power electronic equipment.
[0010] The experimental system of the present invention supplements the initial voltage of the electrical equipment by setting a capacitor energy storage power supply with a frequency of 50 Hz or 60 Hz and controlling the switch QF, thereby avoiding the phenomenon that the main protection switch trips due to excessive initial current.
[0011] The experimental system described in the present invention realizes synchronization / co-phase control of the output controllable energy storage power supply and the grid power supply through the switch QF, supplements the initial voltage of the output controllable energy storage power supply, and avoids the frequent occurrence of the main protection switch tripping of the electrical equipment due to excessive initial current. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a connection block diagram of the test product of the present invention; Figure 2 The test product is the circuit principle diagram of the present invention; DETAILED DESCRIPTION
[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0014] Example 1 An electrical reliability experiment system comprises a switch QF, a voltage regulating transformer T1, a feedback load FL, and an isolation transformer T2 which are connected in series in sequence, wherein the line-in terminal of the switch QF is connected to a power grid, and the output terminal of the isolation transformer T2 is connected to the power grid; the output terminal of the power grid is connected to an output controllable energy storage power supply, and the output terminal of the output controllable energy storage power supply is connected to the line-in terminal of the switch QF; the output controllable energy storage power supply is an LC oscillator, the frequency of the LC oscillator is 50 Hz, and the current output by the LC oscillator is a sine wave with the same frequency as the power grid.
[0015] The voltage regulating transformer T1 is a transformer with four windings on the secondary side and five taps on the primary side. The voltages of the five taps on the primary side are 1.05UN, 1.025UN, UN, 0.975UN, and 0.95UN, respectively, and the voltage regulation range is ±2×2.5%. The ratio of the primary winding to the secondary winding of the voltage regulating transformer T1 is 1:3.
[0016] The test piece S1 is connected between the voltage regulating transformer T1 and the feedback load FL; when the voltage required by the test piece S1 is higher than the voltage provided by the power grid, the primary side of the voltage regulating transformer T1 is connected to the switch QF, and the secondary side is connected to the test piece S1. The voltage input from the power grid is boosted by the voltage regulating transformer T1 and then transmitted to the test piece S1; the voltage regulating transformer plays the role of boosting and isolation.
[0017] The normal input and output connection of the voltage regulating transformer T1 is as shown in Table 1 when the input voltage of the voltage regulating transformer T1 is 400V: Table 1 (voltage unit: V) Example 2 An electrical reliability test system, the content is the same as that of Example 1, except that: The test piece S1 is connected between the voltage regulating transformer T1 and the feedback load FL; when the voltage required by the test piece S1 is lower than the voltage provided by the power grid, the secondary side of the voltage regulating transformer T1 is connected to the switch QF, and the primary side is connected to the test piece S1. The voltage input from the power grid is stepped down by the voltage regulating transformer T1 and then transmitted to the test piece S1; the voltage regulating transformer plays the role of stepping down and isolating.
[0018] The normal input and output connection of the voltage regulating transformer T1 is as shown in Table 2 when the input voltage of the voltage regulating transformer T1 is 400V: Table 2 (voltage unit: V) Example 3 An electrical reliability test system, the content is the same as that of Example 1, except that when the input voltage of the voltage regulating transformer T1 is 230V, its output voltage is as shown in Table 3: Table 3 (voltage unit: V) Example 4 An electrical reliability test system, the content is the same as that of Example 2, except that: when the input voltage of the voltage regulating transformer T1 is 230V, its output voltage is as shown in Table 4: Table 4 (voltage unit: V) It can be seen from Table 1 to Table 4 that the output voltage of the voltage regulating transformer T1 is 18V-8729V, which can meet the reliability test of the corresponding voltage range of transformer products and switchgear products.
[0019] The above experimental system is used for the temperature rise test of switchgear, including the following steps: Step 1: disconnect the switch QF, adjust the size of the feedback load FL according to the test requirements of the test product S1, and charge the output controllable energy storage power supply; Step 2: After the output controllable energy storage power supply is fully charged, turn on the switch QF and connect the test product S1 to the experimental system. The power grid provides a stable power supply to the test product S1, and the current returns to the power grid after passing through the feedback load FL and the isolation transformer T2. The state of the test product S1 is monitored and recorded. At this time, only the feedback load FL consumes power in the experimental system.
[0020] The above experimental system is used for the switch electrical appliance on-off test. The test current is 15000A. The required power factor is 0.3. The standard peak factor is 2.0. The feedback load peak factor is 1.41. The output effective value of the controllable energy storage power supply is 2.0 / 1.41=1.41 times the output voltage, including the following steps: Step 1: First, disconnect the switch QF, adjust the size of the feedback load FL according to the test requirements of the test product S1, and charge the output controllable energy storage power supply; Step 2: After the output controllable energy storage power source is fully charged, the switch QF is turned on, and the test sample S1 is connected to the experimental system. The power grid provides a stable power supply to the test sample S1, and the current returns to the power grid after passing through the feedback load FL and the isolation transformer T2. The state of the test sample S1 is monitored and recorded; Step 3. During the test, the output controllable energy storage power supply supplements the peak current of the experimental system. At the 100ms moment after the first on-off of the test product S1, the output controllable energy storage power supply stops outputting, and the output controllable energy storage power supply is connected to the grid to start charging; at the same moment when the second on-off of the test product S1 starts, the output controllable energy storage power supply stops charging, and the output end of the output controllable energy storage power supply is connected to the switch QF to supplement the peak current of the experimental system. At the 100ms moment after the second on-off of the test product S1 starts, the output controllable energy storage power supply stops outputting again, and the output controllable energy storage power supply is connected to the grid again to start charging; this cycle is repeated until the end of the test.
[0021] Since the output of the controllable energy storage power supply of this experimental system is synchronized / in phase with the grid power supply, it can meet the peak factor requirement of the feedback load FL by superimposing it with the grid power supply. Since an LC oscillator is used as the capacitor energy storage power supply, there is no need to worry about raising the rated voltage for the peak factor even though there is attenuation during the test.
[0022] The above are only preferred embodiments of the present invention. It should be noted that for those skilled in the art, under the technical enlightenment provided by the present invention, other equivalent variations and improvements can also be made, which should also be regarded as the protection scope of the present invention.
Claims
1. An electrical reliability test system, characterized in that: It includes a switch QF, a voltage regulating transformer T1, a feedback load FL, and an isolation transformer T2 connected in series in sequence, the incoming line end of the switch QF is connected to the power grid, and the output end of the isolation transformer T2 is connected to the power grid; the output end of the power grid is connected to the output controllable energy storage power supply, and the output end of the output controllable energy storage power supply is connected to the incoming line end of the switch QF; the test piece S1 is connected between the voltage regulating transformer T1 and the feedback load FL; when the voltage required by the test piece S1 is higher than the voltage provided by the power grid, the primary side of the voltage regulating transformer T1 is connected to the switch QF, and the secondary side is connected to the test piece S1, and the voltage input from the power grid is stepped up by the voltage regulating transformer T1 and transmitted to the test piece S1; when the voltage required by the test piece S1 is lower than the voltage provided by the power grid, the secondary side of the voltage regulating transformer T1 is connected to the switch QF, and the primary side is connected to the test piece S1, and the voltage input from the power grid is stepped down by the voltage regulating transformer T1 and transmitted to the test piece S1.
2. An electrical reliability test system according to claim 1, characterized in that: The voltage regulating transformer T1 is a transformer with multiple windings on the secondary side and multiple taps on the primary side. The secondary windings of the voltage regulating transformer T1 can achieve different output voltages through different combinations of series or parallel connection. Different configurations of the primary side taps of the voltage regulating transformer T1 can achieve fine-tuning of the output voltage of the voltage regulating transformer T1.
3. An electrical reliability test system according to claim 1 or 2, characterized in that: The output controllable energy storage power supply is an LC oscillator, the frequency of the LC oscillator is 50 Hz or 60 Hz, and the current output by the LC oscillator is a sine wave with the same frequency as the power grid.
4. A temperature rise test method for a switching device, the method being accomplished by using an electrical reliability test system as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: disconnect the switch QF, adjust the size of the feedback load FL according to the test requirements of the test product S1, and charge the output controllable energy storage power supply; Step 2: After the output controllable energy storage power supply is fully charged, turn on the switch QF and connect the test product S1 to the experimental system. The power grid provides a stable power supply to the test product S1, and the current returns to the power grid after passing through the feedback load FL and the isolation transformer T2. The state of the test product S1 is monitored and recorded. At this time, only the feedback load FL consumes power in the experimental system.
5. A switch on / off test method, which is accomplished by using an electrical reliability test system as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: First, disconnect the switch QF, adjust the size of the feedback load FL according to the test requirements of the test product S1, and charge the output controllable energy storage power supply; Step 2: After the output controllable energy storage power source is fully charged, the switch QF is turned on, and the test sample S1 is connected to the experimental system. The power grid provides a stable power supply to the test sample S1, and the current returns to the power grid after passing through the feedback load FL and the isolation transformer T2. The state of the test sample S1 is monitored and recorded; Step 3. During the test, the output controllable energy storage power supply supplements the peak current of the experimental system. At the 100ms moment after the first on-off of the test product S1, the output controllable energy storage power supply stops outputting, and the output controllable energy storage power supply is connected to the grid to start charging; at the same moment when the second on-off of the test product S1 starts, the output controllable energy storage power supply stops charging, and the output end of the output controllable energy storage power supply is connected to the switch QF to supplement the peak current of the experimental system. At the 100ms moment after the second on-off of the test product S1 starts, the output controllable energy storage power supply stops outputting again, and the output controllable energy storage power supply is connected to the grid again to start charging; this cycle is repeated until the end of the test.