Electrical durability test system for high-voltage alternating-current switch equipment

Abstract

The utility model relates to a high-voltage AC switchgear electrical durability test system, which comprises a short-circuit impact generator G, an adjustable load loop and a high-capacity measuring mechanism, and is characterized in that the adjustable load loop comprises a switch mechanism on the upstream side of a test object TO, a power supply adjusting mechanism and an adjustable load mechanism on the downstream side of the test object TO; a resistance-capacitance frequency modulation device Rs-Cs is connected in parallel between the power supply adjusting mechanism and the test object TO; the switching mechanism sequentially comprises a protection switch GB, a closing switch MS and an operation switch MB; the power supply adjusting mechanism comprises an adjusting reactor L and an auxiliary switch AB1; the adjustable load mechanism comprises a group of adjusting reactance L and load resistor R which are connected with the downstream end of the test object TO, and a group of adjusting reactance L and load resistor R which are connected with the downstream end of the test object TO through an auxiliary switch AB2. According to the system, multiple frequent actions are avoided, the loss of a fixed switch device of a test loop is reduced, and the cost is reduced while the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage AC switch equipment detection, and particularly relates to an electrical durability test system for high-voltage AC switch equipment. Background Technique

[0002] High-voltage AC switch equipment (contactors, circuit breakers) is a kind of switch control electrical appliance widely used in the power industry, mainly used for frequently connecting and disconnecting electrical equipment, and its reliable operation directly affects the safety of electrical equipment. With the increase in the number of operations, the losses caused by electrical stress and mechanical stress in the switch equipment continue to accumulate, the performance and life of the vacuum interrupter continue to decline, and ultimately it will inevitably lead to failure. If a judgment and replacement are made before the end of the life, the reliability of the electrical control system can be improved, and the safety of the electrical equipment can be guaranteed. Electrical durability test belongs to the special type test items specified in the GB / T 14808-2016 standard, and is a direct way to evaluate the performance status of switch equipment. The GB / T 14808-2016 standard stipulates that the electrical wear resistance life of contactors and starters is represented by the number of load operation cycles under given working conditions, and no parts shall be repaired or replaced during the entire load operation period.

[0003] With the progress of technology, more and more high-voltage AC switch equipment (contactors, circuit breakers) are applied to nuclear power projects, so the requirements for the electrical durability performance of switch equipment are more stringent. The existing conventional test procedure is as follows: Since the closing-opening operation corresponds to different test currents, different test circuits need to be built and the closing-opening test operations are carried out separately. Generally, the number of electrical durability tests is extremely large, so the use of this scheme for inspection and detection requires high equipment usage costs and personnel costs. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an electrical durability test system for high-voltage AC switch equipment, which is based on the test circuit used in the existing large-capacity laboratory, and an auxiliary switch is connected to replace the closing switch and the operating switch equipment of the original test circuit, so as to avoid frequent actions, reduce the loss of the fixed switch equipment of the test circuit, improve the test efficiency while reducing the cost, and further improve the technical detection ability of the laboratory, and has strong replicability and popularization.

[0005] The electrical durability test system for high-voltage AC switchgear includes a short-circuit impact generator G for providing test power, an adjustable load circuit for serving as a test circuit for connecting a test object TO and capable of adjusting the current and power factor parameters of the test circuit, and a large-capacity measurement mechanism for measuring the current, voltage, and transient recovery voltage in the adjustable load circuit during the test and performing data waveform processing. Among them, the adjustable load circuit includes a switching mechanism, a power supply adjustment mechanism on the upstream side of the test object TO, and an adjustable load mechanism on the downstream side of the test object TO; a capacitance-resistance frequency modulation device Rs-Cs is connected in parallel between the power supply adjustment mechanism and the test object TO; the switching mechanism sequentially includes a protection switch GB, a closing switch MS, and an operating switch MB; the power supply adjustment mechanism includes an adjustment reactance L and an auxiliary switch AB1; the adjustable load mechanism includes a group of adjustment reactances L and load resistors R connected to the downstream end of the test object TO, and a group of adjustment reactances L and load resistors R connected to the downstream end of the test object TO through an auxiliary switch AB2.

[0006] Specifically, the auxiliary switches AB1 and AB2 both adopt high-voltage vacuum circuit breakers, the adjustment reactance L adopts a high-voltage reactor, and the load resistor R adopts a non-inductive resistor.

[0007] Furthermore, the large-capacity measurement mechanism includes a voltage measurer U and a current measurer I connected in series between the auxiliary switch AB1 and the test object TO.

[0008] The electrical durability test system for high-voltage AC switchgear of the present utility model is based on the test circuit used in existing large-capacity laboratories, and an auxiliary switch is connected to replace the closing switch and operating switch equipment of the original test circuit, thereby avoiding multiple frequent operations, reducing the loss of the fixed switch equipment in the test circuit, improving the test efficiency while reducing the cost, and further improving the technical detection ability of the laboratory, and having strong replicability and popularization. Description of the Drawings

[0009] The following further describes the electrical durability test system for high-voltage AC switchgear of the present utility model with reference to the drawings:

[0010] Figure 1 is the logic structure and connection principle block diagram of the electrical durability test system for high-voltage AC switchgear;

[0011] Figure 2 is the circuit diagram of the electrical durability test system for high-voltage AC switchgear;

[0012] Figure 3 is the large and small test current waveform diagrams of the electrical durability test system for high-voltage AC switchgear;

[0013] Figure 4It is the test operation flow chart of the electrical durability test system for this high-voltage AC switchgear.

[0014] In the figure:

[0015] 1 - Adjustable load circuit, 2 - Large-capacity measuring mechanism;

[0016] 11 - Switch mechanism, 12 - Power adjustment mechanism, 13 - Adjustable load mechanism. Specific implementation manners

[0017] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0019] The following further describes the technical solution of the present utility model with specific embodiments, but the protection scope of the present utility model is not limited to the following embodiments.

[0020] Embodiment 1: As Figure 1 、 2As shown in the figure, the electrical durability test system for this high-voltage AC switchgear includes a short-circuit impact generator G for providing a test power supply, an adjustable load circuit 1 for serving as a test circuit for connecting a test sample TO and capable of adjusting the current and power factor parameters of this test circuit, and a large-capacity measuring mechanism 2 for measuring the current, voltage, and transient recovery voltage in the adjustable load circuit 1 during the test and performing data waveform processing. Among them, the adjustable load circuit 1 includes a switch mechanism 11 on the upstream side of the test sample TO, a power supply adjustment mechanism 12, and an adjustable load mechanism 13 on the downstream side of the test sample TO; a resistor-capacitor frequency modulation device Rs-Cs is connected in parallel between the power supply adjustment mechanism 12 and the test sample TO; the switch mechanism 11 successively includes a protection switch GB, a closing switch MS, and an operating switch MB; the power supply adjustment mechanism 12 includes an adjustable reactance L and an auxiliary switch AB1; the adjustable load mechanism 13 includes a set of adjustable reactance L and load resistor R connected to the downstream end of the test sample TO, and a set of adjustable reactance L and load resistor R connected to the downstream end of the test sample TO through an auxiliary switch AB2.

[0021] Embodiment 2: In the electrical durability test system for this high-voltage AC switchgear, the auxiliary switches AB1 and AB2 both adopt high-voltage vacuum circuit breakers, the adjustable reactance L adopts a high-voltage reactor, and the load resistor R adopts a non-inductive resistor. They are respectively used to undertake the tasks of opening and closing the test circuit and load switching. While ensuring the efficient progress of the test, they avoid the frequent actions of the closing switch and the operating protection switch in the circuit, thereby reducing the loss of important equipment in the circuit itself. The adjustable load circuit uses an adjustable reactance circuit to build the test load circuit, and through the series connection of a high-voltage reactor and a non-inductive resistor, the test circuit meets the current and power factor parameters specified by the standard. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0022] Embodiment 3: In the electrical durability test system for this high-voltage AC switchgear, the large-capacity measuring mechanism 2 includes a voltage measuring device U and a current measuring device I connected in series between the auxiliary switch AB1 and the test sample TO. As a complete composition of the measuring mechanism, primary measuring devices in the test circuit such as Rogowski coils and voltage dividers are deeply integrated with the secondary data acquisition cabinet and data processing equipment, so as to complete the high-precision measurement and data waveform processing of the current, voltage, and transient recovery voltage (TRV) required during the test. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0023] During operation: The input and cut-off of the test power supply are controlled by the auxiliary switch AB1, and the input and cut-off of the load are controlled by the auxiliary switch AB2. As Figure 3As shown, by reasonably coordinating the opening and closing sequences of the two auxiliary switches, the conversion between large current and small current is completed, so as to meet different test current conditions specified by the standard (closing large current of 600A and opening / closing small current of 100A) with one test circuit. The opening and closing sequences of the auxiliary switches AB1 and AB2 (auxiliary switches 1 and 2) are as Figure 4 shown. By coordinating with the test timing setting system, two effective closing / opening tests of the test sample can be completed during one short-circuit test process.

[0024] Based on the test circuit used in the existing large-capacity laboratory, this high-voltage AC switchgear electrical durability test system connects auxiliary switches to replace the closing switch and operating switch equipment of the original test circuit, thus avoiding multiple frequent operations, reducing the loss of the fixed switch equipment in the test circuit, improving the test efficiency while reducing the cost, and further enhancing the technical detection ability of the laboratory. It has strong replicability and popularization.

[0025] The above description shows the main features, basic principles, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments or examples, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the above embodiments or examples should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0026] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high voltage AC switchgear electrical durability test system, characterized by: The invention comprises a short-circuit impulse generator G for providing a test power supply, an adjustable load circuit (1) for being connected to a test circuit of a test object TO and capable of adjusting the current and power factor parameters of the test circuit, and a large-capacity measuring mechanism (2) for measuring the current, voltage and transient recovery voltage in the adjustable load circuit (1) during the test and performing data waveform processing, wherein the adjustable load circuit (1) comprises a switch mechanism (11) and a power supply regulating mechanism (12) at the upstream side of the test object TO, and an adjustable load mechanism (13) at the downstream side of the test object TO; a resistance-capacitance frequency modulation device Rs-Cs is connected in parallel between the power supply regulating mechanism (12) and the test object TO; The switch mechanism (11) comprises a protection switch GB, a closing switch MS, and an operating switch MB in sequence; the power supply regulating mechanism (12) comprises a regulating reactance L and an auxiliary switch AB1; the adjustable load mechanism (13) comprises a group of regulating reactance L and a load resistor R connected to the downstream end of the test object TO and a group of regulating reactance L and a load resistor R connected to the downstream end of the test object TO via an auxiliary switch AB2.

2. The electrical durability test system for high-voltage AC switchgear according to claim 1 is characterized in that: The auxiliary switches AB1 and AB2 are both high-voltage vacuum circuit breakers, the regulating inductor L is a high-voltage reactor, and the load resistor R is a non-inductive resistor.

3. The electrical durability test system for high-voltage AC switchgear according to claim 2 is characterized in that: The large-capacity measuring mechanism (2) comprises a voltage measuring device U and a current measuring device I which are connected in series between the auxiliary switch AB1 and the test object TO.

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