Current adjusting system for high-voltage switch temperature rise test

Abstract

The utility model belongs to the field of high-voltage switch temperature rise tests, and discloses a current regulating system for a high-voltage switch temperature rise test, a power supply device is sequentially connected with a voltage regulator, a reactance load unit and a current booster, the other end of the current booster is connected with a high-voltage switch to be tested, and two ends of the reactance load unit are connected with a short-circuit switch in parallel; due to the introduction of the reactance load unit, the total load of the system is increased when the load is small, the regulation of the voltage regulator is more stable, the output current of the large current generator is closer to the designed operation point, and the stability of the test current is obviously improved; when large current output is needed, the short circuit switch can bypass the reactance load unit to reduce the total impedance of the system, and the system can still keep efficient output. According to the system, through dynamic access or short circuit of the reactance load, the effective regulation range of the voltage regulator is expanded, the current regulation speed is reduced by utilizing the characteristics of the inductance load, stable current output is realized, the test precision is improved, good adaptability and controllability are achieved, and the temperature rise test requirements of switch equipment with different capacities are met.

Description

Technical Field

[0001] This utility model belongs to the field of high voltage switch temperature rise test technology, specifically relating to a current adjustment system for high voltage switch temperature rise test. Background Technology

[0002] As a critical piece of equipment in power systems, the thermal stability of high-voltage switchgear during long-term operation at rated current is an important indicator of product quality. Therefore, rigorous temperature rise tests must be conducted on high-voltage switchgear before it leaves the factory.

[0003] Currently, common temperature rise test current generating equipment mainly consists of an AC power supply, a voltage regulator, and a transformer. In practical operation, the laboratory needs equipment capable of outputting currents of different amplitudes to meet the testing requirements of various switches. Especially when testing small-load switches, precise and stable current adjustment is crucial. However, the traditional voltage regulator and transformer combination scheme has many drawbacks. When the test current is small, the voltage regulator's adjustment range is limited, resulting in insufficient resolution. Due to the high system impedance and weak load capacity under small loads, even small changes in the voltage regulator's output voltage can cause significant fluctuations in the output current. Simultaneously, the transformer's operating point deviates from its optimal efficiency range under light load conditions, further exacerbating system instability. These problems seriously affect the accuracy of temperature rise test data, potentially leading to misjudgments of the test sample's performance, and consequently impacting the safe and stable operation of the power system.

[0004] Therefore, it is evident that using the existing current regulation system results in large current fluctuations and poor stability due to the limited adjustment range of the voltage regulator, which affects the accuracy of the test. Utility Model Content

[0005] This invention provides a current regulation system for high-voltage switch temperature rise testing, which solves the technical problem that existing current regulation systems suffer from large current fluctuations and poor stability due to the limited adjustment range of the voltage regulator, thus affecting the accuracy of the test.

[0006] To achieve the above objectives, the present invention adopts the following technical content:

[0007] A current regulation system for high-voltage switch temperature rise testing includes: a power supply device;

[0008] The power supply device is connected to a voltage regulator;

[0009] The voltage regulator is connected to a reactive load unit;

[0010] The reactive load unit is connected to a current booster;

[0011] One end of the current booster is connected to the reactive load unit, and the other end is used to connect to the high-voltage switch under test.

[0012] A short-circuit switch is connected in parallel at both ends of the reactive load unit.

[0013] Furthermore, the reactive load unit includes at least one reactor; when the reactive load unit uses multiple reactors, the reactors are connected in series sequentially.

[0014] Furthermore, the reactor is an air-core linear reactor.

[0015] Furthermore, the reactor is an adjustable reactor.

[0016] Furthermore, the reactive load unit includes a first reactor group and a second reactor group connected in parallel;

[0017] The first reactor group includes a first reactor; the second reactor group includes a second reactor and a third reactor connected in series.

[0018] The first reactor group is connected in series with the first switching switch to form the first branch; the second reactor group is connected in series with the second switching switch to form the second branch.

[0019] The first branch, the second branch, and the short-circuit switch are connected in parallel.

[0020] Furthermore, the power supply device uses an AC power source.

[0021] Furthermore, an input circuit breaker is also connected between the AC power supply and the voltage regulator.

[0022] Furthermore, the high-voltage switch is connected in parallel with a resistive load.

[0023] Furthermore, the resistive load is a fixed resistor.

[0024] Furthermore, the reactive load unit is also connected in parallel with a backup circuit, which consists of an electronic voltage regulator and a backup switch connected in series.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention provides a current regulation system for high-voltage switch temperature rise testing. The power supply unit is sequentially connected to a voltage regulator, a reactive load unit, and a current booster. The other end of the current booster is connected to the high-voltage switch under test, and a short-circuit switch is connected in parallel across the reactive load unit. The introduction of the reactive load unit increases the total system load under low load conditions, making the voltage regulator's regulation more stable and the current booster's output current closer to its design operating point, significantly improving the stability of the test current. When a large current output is required, the short-circuit switch can bypass the reactive load unit to reduce the total system impedance, while the system still maintains high-efficiency output. This system, through the dynamic connection or short-circuiting of the reactive load, expands the effective regulation range of the voltage regulator, reduces the current regulation speed due to the inductive load characteristics, and ensures that the current booster always operates within its optimal load rate range, achieving stable current output and improving test accuracy. It effectively solves the problems of regulation instability and transformer efficiency deviation in traditional systems under low load conditions. This system has good adaptability and controllability, meeting the temperature rise test requirements of switchgear with different capacities.

[0027] Preferably, this invention employs multiple series reactors, allowing for flexible adjustment of reactance values ​​and optimization of impedance matching range according to experimental requirements. The series structure enhances the adjustable capability of the reactive load, enabling it to provide suitable inductive impedance at different current levels, further improving the precision of small current regulation and reducing current fluctuations.

[0028] Preferably, in this invention, the hollow linear reactor has the characteristics of no magnetic saturation and high linearity, which can ensure that the reactance value remains stable with the change of current, avoid the nonlinear distortion problem of traditional iron-core reactors, and thus improve the accuracy of current regulation and the reliability of test data.

[0029] Preferably, in this invention, the adjustable reactor allows for dynamic adjustment of the inductance to adapt to impedance requirements under different test conditions, enhancing the system's adaptability. This design optimizes the matching between the voltage regulator and the current booster, improving the stability and regulation efficiency of the current output.

[0030] Preferably, in this invention, a stepped adjustment of the reactive load is achieved through a combination of multiple reactor groups and a switching switch, improving system flexibility. Different reactor combinations can be matched with different current ranges, and the switching switch ensures rapid adjustment, balancing accuracy at low currents and stability at high currents, thus optimizing overall performance.

[0031] Preferably, in this invention, AC power is used, which meets the conventional requirements of high-voltage switch temperature rise test, ensures system compatibility with the power grid, simplifies equipment structure, and reduces implementation cost.

[0032] Preferably, in this invention, the high-voltage switch under test is connected to a resistive load in parallel, which can simulate the actual load characteristics during the test, improve the overall load level, and thus improve the realism of the test. This design helps to stabilize the current output, reduce the impact of switching action on the system, and ensure the accuracy of the test data.

[0033] Preferably, in this invention, the resistive load is a fixed resistor, which has a simple structure and stable resistance, can provide accurate load matching, avoid the adjustment error of the variable resistor, and ensure the stability and repeatability of the current during the test.

[0034] Preferably, in this invention, a backup circuit consisting of an electronic voltage regulator and a backup switch is used; this provides an emergency adjustment means when the main reactance load adjustment fails, thereby enhancing system reliability; the electronic voltage regulator can quickly and accurately adjust the voltage, ensuring uninterrupted testing and improving the system's fault tolerance. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a current regulation system for high-voltage switch temperature rise testing provided in an embodiment of the present invention.

[0036] Figure label:

[0037] 1. AC power supply; 2. Voltage regulator; 3. Reactor; 4. Short-circuit switch; 5. Current booster; 6. High-voltage switch. Detailed Implementation

[0038] To make the technical problem solved by this utility model, the technical solution, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] As described in the background section, existing technologies typically employ a combination of a voltage regulator and a current booster without introducing a reactive load. While the voltage regulator directly adjusts the input voltage of the current booster, insufficient resolution of the regulator leads to unstable current regulation at low current outputs. Furthermore, due to the high impedance and weak system load capacity under low loads, even slight changes in the regulator's output voltage can cause significant fluctuations in the output current. Simultaneously, the current booster's operating point deviates from its optimal efficiency range under light load conditions, further amplifying system volatility. This results in unstable temperature rise test data and may even lead to misjudgments of the test sample's performance.

[0046] To address the above issues, this embodiment provides a current regulation system for high-voltage switch temperature rise testing. This system can solve problems such as poor stability and insufficient control accuracy of test current regulation under different load conditions, especially the problem of large current fluctuations under low load conditions.

[0047] This embodiment provides a current regulation system for high-voltage switch temperature rise test, including: a power supply device, a voltage regulator 2, a reactive load unit and a current booster 5; wherein, the power supply device, the voltage regulator 2, the reactive load unit and the current booster 5 are connected in series in sequence; a short-circuit switch 4 is connected in parallel at both ends of the reactive load unit.

[0048] For example, as a preferred embodiment of this invention, such as Figure 1 As shown, this embodiment provides a current regulation system for high-voltage switch temperature rise testing, including: an AC power supply 1, used to provide electrical energy for the entire temperature rise testing system; a voltage regulator 2, connected after the AC power supply 1, used to regulate the output voltage to control the initial amplitude of the test current; a reactor 3, connected in series between the voltage regulator 2 and the current booster 5, used to provide additional load for small load tests, improve the total load capacity of the system, and enhance regulation stability; a short-circuit switch 4, connected in parallel across the reactor 3, used to short-circuit the reactor during large load tests to avoid energy loss and ensure current output efficiency; a current booster 5, used to boost the output voltage of the voltage regulator 2 to the required current level; and a high-voltage switch 6, as the test object, receiving the large current output from the current booster 5 for temperature rise testing.

[0049] In this embodiment, in the field of high-voltage switch temperature rise test, the small load is usually set to about 2% of the output capacity of the current regulation system; the large load is set to about 80% of the output capacity of the current regulation system.

[0050] In this embodiment, the current regulation system uses AC power supply 1 as the power supply device. The output terminal of AC power supply 1 is connected to the input terminal of voltage regulator 2, and the output terminal of voltage regulator 2 is connected to the reactive load unit. The reactive load unit consists of at least one reactor 3. When multiple reactors are used, they are connected in series. Air-core linear reactors or adjustable reactors are preferred for the reactors 3. When using an air-core linear reactor, its inductance ensures that the total system impedance increases by 20%-50% during small load testing. The output terminal of the reactive load unit is connected to the primary side of current booster 5, and the secondary side of current booster 5 is connected to the high-voltage switch 6 under test. Simultaneously, a short-circuit switch 4 is connected in parallel across the reactive load unit to bypass it when a large current output is required. In this embodiment, AC power supply 1 is connected to voltage regulator 2 via an input circuit breaker, providing overload / short-circuit protection during testing. When the voltage regulator or subsequent circuit malfunctions, the power supply is quickly cut off to prevent the fault from escalating.

[0051] The key to this invention is that a reactive load unit is connected in series between the voltage regulator and the current booster, and a switching device is provided to enable its access and bypass control in different test modes.

[0052] The specific working principle is as follows:

[0053] When the test enters the low load stage, the reactive load unit (reactor 3) is introduced into the system circuit as an additional load. Its inductive reactance characteristics limit the rapid change of current, improve the buffering of the output voltage regulation of voltage regulator 2, improve the working state of current booster 5, and significantly improve the stability and linear regulation capability of current output.

[0054] When the test enters the high load stage, the current regulation system bypasses and short-circuits the reactive load unit (reactor 3) through a switching mechanism such as a contactor or a changeover switch (short-circuit switch 4 is used in this embodiment), thereby avoiding energy loss caused by inductive reactance limitation, ensuring efficient output of the current booster, and meeting the test requirements for continuous supply of high current.

[0055] In this embodiment, the selection of the reactive load unit needs to be rationally designed based on the common small load conditions in actual tests. Its inductive reactance value should balance current stability and adjustment sensitivity while increasing the total load of the system. The switching mechanism can be automatically controlled according to the test control system, or it can be manually switched, providing good operational flexibility.

[0056] In addition, this solution has good versatility and is applicable to high-voltage switchgear temperature rise test systems of various structural types and capacity levels. It can be independently integrated as an upgrade module for existing laboratory equipment to improve the overall control capability and operational quality of the test system.

[0057] For example, the reactive load unit is further optimized to include a first reactor group and a second reactor group connected in parallel. The first reactor group consists of a first reactor connected in series with a first switching switch to form a first branch; the second reactor group consists of a second reactor and a third reactor connected in series with a second switching switch to form a second branch. The first branch, the second branch, and the short-circuit switch are connected in parallel, and three impedance modes are achieved by controlling the on / off state of different switches: closing the first switching switch is a high impedance mode for small load testing; closing the second switching switch is a medium impedance mode for testing between small and large loads; closing the short-circuit switch is a low impedance mode, shorting both the first and second branches for large load testing. This design can improve the current regulation capability of the system and adapt to complex small load subdivision scenarios; at the same time, it reduces the design redundancy of a single reactor and improves the system flexibility.

[0058] For example, a resistive load is connected in parallel across the two ends of the high-voltage switch 6 under test. The resistive load can be a fixed resistor, used to achieve load balancing during the test and ensure stable distribution of the test current. The reactive load unit is also connected in parallel with a backup circuit, which consists of an electronic voltage regulator and a backup switch connected in series. When the reactor 3 fails, the backup switch can be closed to maintain the test through the electronic voltage regulator.

[0059] In summary, this utility model provides a current regulation system for high-voltage switch temperature rise testing, which has the following advantages compared to existing current regulation systems:

[0060] The power supply unit uses AC power and connects to the high-voltage switch under test via a voltage regulator, a reactive load unit, and a current booster. A short-circuit switch is connected in parallel across the reactive load unit, providing a stable framework for current regulation. The introduction of the reactive load unit increases the total system load at low loads, making the voltage regulator's adjustment more stable and the current booster's output current closer to its design operating point. This significantly improves the stability of the test current. Even with the reactive load shorted during high-load tests, the system maintains high-efficiency output. This system possesses good adaptability and controllability, meeting the temperature rise test requirements of switchgear with different capacities. The reactive load unit can be composed of one or more reactors. Using air-core linear reactors can ensure linearity and reduce harmonic interference. Using adjustable reactors can flexibly adjust the inductance to meet different test requirements. The reactive load unit is divided into two groups connected in parallel, each with a switching switch. With the help of a short-circuit switch, different reactor combinations can be flexibly switched according to the test conditions, improving adjustment accuracy and adaptability. The high-voltage switch under test is connected in parallel with a fixed resistive load, which can share the current and stabilize the system during small load tests, improving test accuracy.

[0061] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A current regulating system for high voltage switch temperature rise test, characterized by, include: Power supply equipment; The power supply device is connected to a voltage regulator (2); The voltage regulator (2) is connected to an electrical load unit; The reactive load unit is connected to a current booster (5). One end of the current booster (5) is connected to the reactor load unit, and the other end is used to connect to the high voltage switch (6) under test. A short-circuit switch (4) is connected in parallel at both ends of the reactive load unit.

2. The current regulation system for high-voltage switch temperature rise testing according to claim 1, characterized in that, The reactive load unit includes at least one reactor (3); when the reactive load unit uses multiple reactors, the reactors are connected in series in sequence.

3. The current regulation system for high-voltage switch temperature rise testing according to claim 2, characterized in that, The reactor (3) is a hollow linear reactor.

4. The current regulating system for high-voltage switch temperature rise test according to claim 2, characterized in that, The reactor (3) is an adjustable reactor.

5. The current regulating system for high voltage switch temperature rise test according to claim 1, wherein, The reactive load unit includes a first reactor group and a second reactor group connected in parallel; The first reactor group includes a first reactor; the second reactor group includes a second reactor and a third reactor connected in series. The first reactor group is connected in series with the first switching switch to form the first branch; the second reactor group is connected in series with the second switching switch to form the second branch. The first branch, the second branch, and the short-circuit switch (4) are connected in parallel.

6. The current regulating system for high voltage switch temperature rise test according to claim 1, wherein, The power supply device uses an AC power source (1).

7. The current regulation system for high-voltage switch temperature rise testing according to claim 6, characterized in that, An input circuit breaker is also connected between the AC power supply (1) and the voltage regulator (2).

8. The current regulation system for high-voltage switch temperature rise testing according to claim 1, characterized in that, The high-voltage switch (6) is connected in parallel with a resistive load.

9. The current regulation system for high-voltage switch temperature rise testing according to claim 8, characterized in that, The resistive load is a fixed resistor.

10. The current regulating system for high voltage switch temperature rise test according to claim 1, wherein, The reactive load unit is also connected in parallel with a backup circuit, which consists of an electronic voltage regulator and a backup switch connected in series.

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