Circuit breaker contact system parameter adjustment method, device and electronic equipment

Abstract

This application provides a method, apparatus, and electronic device for adjusting circuit breaker contact system parameters, relating to the field of circuit breaker technology. The method includes: obtaining the arc contact opening distance, main contact opening distance, and critical short-circuit current range of the circuit breaker to be adjusted; calculating the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; adjusting the first ratio within a first preset ratio range; performing a breaking test on the circuit breaker to be adjusted using a target short-circuit current based on the value of the first ratio; and determining the target ratio of the circuit breaker to be adjusted based on the arcing time or number of breaking tests obtained from the breaking test, so that the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio; the first preset ratio range is 1.2 to 1.4, and the target short-circuit current is any value within the critical short-circuit current range. By adjusting the arc contact opening distance and main contact opening distance, the reliability of the circuit breaker in breaking within the rated short-circuit breaking current range is improved.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to a method, device and electronic equipment for adjusting the parameters of a circuit breaker contact system. Background Technology

[0002] A circuit breaker comprises key components such as a moving contact system, a stationary contact system, an operating mechanism, an arc-extinguishing system, an electronic trip unit, a current transformer, and an electromagnetic trip unit. During circuit breaker operation, the control circuit inside the electronic trip unit collects the current and voltage values ​​of the main circuit in real time through the current transformer. When the current value in the main circuit suddenly increases, the electronic trip unit outputs a command to control the circuit breaker to disconnect. The operating mechanism executes the command of the electronic trip unit, causing the moving and stationary contacts of the circuit breaker to separate. During the separation process, an electric arc is generated due to air breakdown between the moving and stationary contacts. Even after the moving and stationary contacts have separated by a certain distance, the arc continues to burn. At this time, it is necessary to transfer the arc and excess energy to the arc-extinguishing chamber for absorption and consumption, thereby achieving the purpose of controlling the circuit breaker to completely disconnect. The magnitude of the three-phase line voltage and short-circuit current that a circuit breaker can interrupt indicates the level of its rated short-circuit breaking capacity (e.g., rated short-circuit breaking current). In order to adapt to high-voltage and high-capacity operating conditions, it is necessary to continuously improve the short-circuit breaking capacity of circuit breakers under high-voltage conditions.

[0003] Research and practical applications have revealed that the rated short-circuit breaking capacity does not guarantee reliable protection for all circuit breakers within the short-circuit current protection range. For example, when a circuit breaker is used in an AC voltage range of 1140V, under normal circumstances, reliable protection can be achieved by breaking the circuit when the short-circuit current in the main circuit is lower than the rated short-circuit breaking current. However, extensive practical applications have shown that when the short-circuit current is within a certain range of the rated short-circuit breaking current, although the current is much smaller than the rated breaking current, the energy of the generated arc is insufficient to quickly and effectively transfer from the moving and stationary contacts to the arc-extinguishing chamber. Moreover, due to the high voltage between the moving and stationary contacts, the arc cannot be broken by the opening gap, causing the arc to remain in the gap between the moving and stationary contacts and the arc-extinguishing chamber and continue to burn. The arcing time is significantly prolonged or doubled, resulting in severe burn-out of the circuit breaker contacts and arc-extinguishing chamber, making reliable breaking impossible. Consequently, when the short-circuit current is within a certain range of the rated short-circuit breaking current, the circuit breaker cannot provide reliable protection.

[0004] Therefore, improving the reliability of circuit breakers in breaking within the rated short-circuit breaking current range is an important problem that needs to be solved. Summary of the Invention

[0005] This application provides a method, apparatus, and electronic device for adjusting the parameters of a circuit breaker contact system, so as to improve the reliability of the circuit breaker in breaking within the rated short-circuit breaking current range.

[0006] In a first aspect, this application provides a method for adjusting the parameters of a circuit breaker contact system, the method comprising: Obtain the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted; Obtain the critical short-circuit current range of the circuit breaker to be adjusted; Calculate the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; The first ratio is adjusted within a first preset ratio range. The circuit breaker to be adjusted is tested with the target short-circuit current as the short-circuit current according to the value of the first ratio. The target ratio of the circuit breaker to be adjusted is determined based on the arcing time or number of breaks obtained from the breaking test, so that the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. Wherein, the first preset ratio range is 1.2 to 1.4, the target ratio is any value in the first preset ratio, and the target short-circuit current is any value in the critical short-circuit current range.

[0007] In one possible design, obtaining the critical short-circuit current range of the circuit breaker to be adjusted includes: Obtain the rated short-circuit breaking current Ics and rated current In of the circuit breaker to be adjusted; Calculate the ratio of the rated short-circuit breaking current Ics to the rated current In to obtain the first ratio k, where k is a positive integer; Select (1~k) times the rated current In sequentially as the short-circuit current for breaking tests, and record the arcing time obtained in each breaking test; When the arcing time is greater than or equal to 40ms for the first time, the current short-circuit current is taken as the starting point of the critical short-circuit current interval; when the arcing time is less than 40ms for the first time, the current short-circuit current is taken as the ending point of the critical short-circuit current interval. Based on the starting point and the ending point, the critical short-circuit current range of the circuit breaker to be adjusted is obtained.

[0008] In one possible design, when the rated voltage Ue of the circuit breaker to be adjusted is an AC voltage of 1140V, the critical short-circuit current range is (3~5) times the rated current In.

[0009] In one possible design, adjusting the first ratio within a first preset ratio range, and conducting a breaking test on the circuit breaker to be adjusted using the target short-circuit current as the short-circuit current based on the value of the first ratio, and determining the target ratio of the circuit breaker to be adjusted based on the arcing time or number of breaking tests obtained from the breaking test, includes: The first ratio is adjusted within the first preset ratio range, and the circuit breaker to be adjusted performs breaking tests sequentially with the target short-circuit current as the short-circuit current according to the value of the first ratio. Record the arcing time obtained from each break test. When the arcing time is less than 40ms, determine the current value of the first ratio as the target ratio of the circuit breaker to be adjusted.

[0010] In one possible design, adjusting the first ratio within a first preset ratio range, and conducting a breaking test on the circuit breaker to be adjusted using the target short-circuit current as the short-circuit current based on the value of the first ratio, and determining the target ratio of the circuit breaker to be adjusted based on the arcing time or number of breaking tests obtained from the breaking test, further includes: The first ratio is adjusted within the first preset ratio range, and the circuit breaker to be adjusted performs breaking tests sequentially with the target short-circuit current as the short-circuit current according to the value of the first ratio. Record the number of breaks obtained from each break test, select the maximum value among the number of breaks, and determine the current value of the first ratio corresponding to the maximum value among the number of breaks as the target ratio of the circuit breaker to be adjusted.

[0011] In one possible design, the first ratio is in the range of 1.1 to 1.5.

[0012] Secondly, this application provides a circuit breaker contact system parameter adjustment device, the circuit breaker contact system parameter adjustment device comprising: The first acquisition module is used to acquire the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted; The second acquisition module is used to acquire the critical short-circuit current range of the circuit breaker to be adjusted. The calculation module is used to calculate the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; The determining module is used to adjust the first ratio within a first preset ratio range. The circuit breaker to be adjusted performs a breaking test using a target short-circuit current as the short-circuit current, based on the value of the first ratio. The target ratio of the circuit breaker to be adjusted is determined based on the arcing time or number of breaking tests obtained from the breaking test, so that the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. The first preset ratio range is 1.2 to 1.4, the target ratio is any value within the first preset ratio range, and the target short-circuit current is any value within the critical short-circuit current range.

[0013] Thirdly, this application provides an electronic device, which includes a processor and a memory; the memory stores at least one piece of program code, which is executed by the processor to implement the circuit breaker contact system parameter adjustment method as described in the first aspect. Fourthly, this application provides a computer-readable storage medium storing at least one piece of program code, which is executed by a processor to implement the circuit breaker contact system parameter adjustment method as described in the first aspect.

[0014] Fifthly, this application provides a computer program product, including a computer program having at least one piece of program code, the at least one piece of program code being executed by a processor to implement the circuit breaker contact system parameter adjustment method as described in the first aspect.

[0015] The beneficial effects of the embodiments of this application are as follows: In this embodiment, the process involves first obtaining the arc contact opening distance, main contact opening distance, and critical short-circuit current range of the circuit breaker to be adjusted; then, calculating the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; finally, adjusting the first ratio within a first preset ratio range; and conducting a breaking test on the circuit breaker to be adjusted based on the value of the first ratio, using the target short-circuit current as the short-circuit current. The target ratio of the circuit breaker to be adjusted is determined based on the arcing time or number of breaking tests obtained from the breaking test, so that the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. The first preset ratio range is 1.2 to 1.4, the target ratio is any value within the first preset ratio, and the target short-circuit current is any value within the critical short-circuit current range. By adjusting the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted, and selecting a target short-circuit current based on the critical short-circuit current range, a breaking test is conducted using the target short-circuit current as the short-circuit current. The arcing time or breaking number obtained from the breaking test is used for verification, thereby obtaining the target ratio of the circuit breaker to be adjusted. The arc contact opening distance and main contact opening distance are then adjusted according to this target ratio, so that the circuit breaker that originally could not provide reliable breaking under the target short-circuit current can reliably break, thus suppressing the phenomenon of unreliable breaking in the critical short-circuit current range, thereby improving the reliability of the circuit breaker in breaking within the rated short-circuit breaking current range. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0017] Figure 1 This application provides a method for adjusting the parameters of a circuit breaker contact system. Figure 2 A structural diagram of a circuit breaker contact system provided in an embodiment of this application; Figure 3 A schematic diagram of a critical short-circuit current range provided for an embodiment of this application; Figure 4 This is a schematic diagram of a circuit breaker contact system parameter adjustment device provided in an embodiment of this application. Detailed Implementation

[0018] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0020] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0021] In AC power distribution systems, the rated voltage Ue of the main circuit of a circuit breaker is usually between AC230V and AC1500V. For conventional power and industrial construction, most are AC400V or AC960V, while for new energy sources such as wind power, photovoltaics, and energy storage, as well as metallurgical and petrochemical applications, AC800V, AC1000V, AC1140V, AC1380V, and AC1500V are more commonly used.

[0022] By statistically analyzing circuit breakers with different rated currents In, Ics, and Ue in current applications, as shown in Table 1, it was found that: when the rated voltage Ue is AC400V, the rated short-circuit breaking current Ics is approximately 20 to 40 times the rated current In; when the rated voltage Ue is AC690V, the rated short-circuit breaking current Ics is approximately 15 to 30 times the rated current In; and when the rated voltage Ue is AC1140V, the rated short-circuit breaking current Ics is approximately 10 to 20 times the rated current In. It is evident that as the rated voltage Ue increases, the rated short-circuit breaking current Ics of the circuit breaker decreases. This is because the arc energy that a contact system and arc extinguishing system of the same specification can withstand is limited; the higher the rated voltage Ue, the smaller the short-circuit current that can be broken.

[0023] Table 1

[0024] Based on the relationship between the rated current In, the rated short-circuit breaking current Ics, and the rated voltage Ue, this application provides a method for adjusting the parameters of a circuit breaker contact system, which is used to adjust the arc contact opening distance and the main contact opening distance of the circuit breaker to improve the reliability of the circuit breaker in breaking within the rated short-circuit breaking current range.

[0025] See Figure 1 , Figure 1 This application provides a method for adjusting the parameters of a circuit breaker contact system, such as... Figure 1 As shown, the method for adjusting the parameters of the circuit breaker contact system includes: S1, obtain the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted.

[0026] See Figure 2 , Figure 2 A structural diagram of a circuit breaker contact system provided in this application embodiment is shown below. Figure 2 As shown, in practical applications, the arc contact distance D2 and main contact distance D1 of the circuit breaker to be adjusted can be obtained by measurement.

[0027] S2, obtain the critical short-circuit current range of the circuit breaker to be adjusted.

[0028] Under normal circumstances, when the short-circuit current in the main circuit is lower than the rated short-circuit breaking current of the circuit breaker, reliable protection can be achieved by the circuit breaker's breaking action. However, extensive practical applications have revealed that when the short-circuit current is within a certain range of the rated short-circuit breaking current, although the short-circuit current is much smaller than the rated short-circuit breaking current, the energy of the generated arc is insufficient to quickly and effectively transfer from the moving contact and stationary contact to the arc-extinguishing chamber. Moreover, due to the high voltage between the moving contact and stationary contact, the arc cannot be broken by the opening gap, causing the arc to remain in the gap between the moving contact, stationary contact, and arc-extinguishing chamber and continue to burn. The arcing time is greatly extended or doubled, resulting in severe burn-out of the circuit breaker's contacts and arc-extinguishing chamber, making reliable breaking impossible. Consequently, when the short-circuit current is within a certain range of the rated short-circuit breaking current, the circuit breaker cannot provide reliable protection.

[0029] Although the aforementioned abnormal current range falls within the protection range of the rated short-circuit breaking current, there is a phenomenon where the circuit breaker cannot break normally. This current range is called the critical short-circuit current range. After obtaining the critical short-circuit current range of the circuit breaker to be adjusted, this application needs to adjust the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted in order to suppress the phenomenon of unreliable breaking within the critical short-circuit current range, thereby improving the reliability of the circuit breaker breaking within the rated short-circuit breaking current range.

[0030] S3, calculate the ratio of the arc contact opening distance to the main contact opening distance to obtain the first ratio.

[0031] By calculating the ratio of the arc contact opening distance D2 to the main contact opening distance D1, the first ratio, D2 / D1, can be obtained.

[0032] S4, the first ratio is adjusted within the first preset ratio range. The circuit breaker to be adjusted is tested with the target short-circuit current as the short-circuit current according to the value of the first ratio. The target ratio of the circuit breaker to be adjusted is determined based on the arcing time or number of breaks obtained from the breaking test, so that the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. The first preset ratio range is 1.2 to 1.4, the target ratio is any value in the first preset ratio range, and the target short-circuit current is any value in the critical short-circuit current range.

[0033] The first ratio (D2 / D1) is adjusted within the first preset ratio range (1.2~1.4). When the first ratio is selected to a specific value within the first preset ratio range, a breaking test is performed at that ratio. During the breaking test, any value in the critical short-circuit current range needs to be selected as the target short-circuit current. Since the short-circuit current value in the critical short-circuit current range has a longer arcing time and a lower number of breaking times, the target ratio of the circuit breaker to be adjusted can be determined based on the arcing time or the number of breaking times obtained from the breaking test. After determining the target ratio of the circuit breaker to be adjusted, the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. The adjusted circuit breaker can reliably break under the target short-circuit current.

[0034] In this embodiment, the process involves first obtaining the arc contact opening distance, main contact opening distance, and critical short-circuit current range of the circuit breaker to be adjusted; then, calculating the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; finally, adjusting the first ratio within a first preset ratio range; and conducting a breaking test on the circuit breaker to be adjusted based on the value of the first ratio, using the target short-circuit current as the short-circuit current. The target ratio of the circuit breaker to be adjusted is determined based on the arcing time or number of breaking tests obtained from the breaking test, so that the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. The first preset ratio range is 1.2 to 1.4, the target ratio is any value within the first preset ratio, and the target short-circuit current is any value within the critical short-circuit current range. By adjusting the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted, and selecting a target short-circuit current based on the critical short-circuit current range, a breaking test is conducted using the target short-circuit current as the short-circuit current. The arcing time or breaking number obtained from the breaking test is used for verification, thereby obtaining the target ratio of the circuit breaker to be adjusted. The arc contact opening distance and main contact opening distance are then adjusted according to this target ratio, so that the circuit breaker that originally could not provide reliable breaking under the target short-circuit current can reliably break, thus suppressing the phenomenon of unreliable breaking in the critical short-circuit current range, thereby improving the reliability of the circuit breaker in breaking within the rated short-circuit breaking current range.

[0035] In one possible embodiment, step S2 above includes: S21, obtain the rated short-circuit breaking current Ics and rated current In of the circuit breaker to be adjusted.

[0036] The rated short-circuit breaking current Ics and rated current In of the circuit breaker to be adjusted are inherent parameters of the circuit breaker. For example, the rated short-circuit breaking current Ics and rated current In of the circuit breaker to be adjusted can be obtained by consulting the instruction manual of the circuit breaker to be adjusted.

[0037] S22, calculate the ratio of the rated short-circuit breaking current Ics to the rated current In, and obtain the first ratio k, where k is a positive integer.

[0038] Calculate the ratio of the rated short-circuit breaking current Ics to the rated current In to obtain the first ratio k. The first ratio k can be a positive integer or include a decimal part. For example, the first ratio k can be 10 or 10.2. However, in actual project applications, when the first ratio k includes a decimal part, it is necessary to round the first ratio k to the nearest integer. For example, if the first ratio k can be 10.2, the first ratio k can be set to 10.

[0039] S23, select (1~k) times the rated current In as the short-circuit current for breaking tests in turn, and record the arcing time obtained in each breaking test.

[0040] When conducting a breaking test, a short-circuit current needs to be set. The results of the breaking test are used to analyze whether the circuit breaker can break normally under this short-circuit current. In this application, (1~k) times the rated current In are selected sequentially as the short-circuit current for breaking tests, and the arcing time obtained in each breaking test is recorded. For example, when k is 10, (1~10) times the rated current In are selected sequentially as the short-circuit current for breaking tests, and the arcing time obtained in each breaking test is recorded.

[0041] S24: When the arcing time is greater than or equal to 40ms for the first time, the current short-circuit current is taken as the starting point of the critical short-circuit current interval; when the arcing time is less than 40ms for the first time, the current short-circuit current is taken as the ending point of the critical short-circuit current interval.

[0042] This application sets the time of two cycles of 50Hz AC power (i.e., 40ms) as the comparison threshold for arcing time. When the arcing time is greater than 40ms, it is determined that the arcing time is too long, and the selected short-circuit current is in the critical short-circuit current range.

[0043] The critical short-circuit current range may be one range or multiple ranges. In order to obtain all the critical short-circuit current ranges, it is necessary to select (1~k) times the rated current In as the short-circuit current for each range and conduct a breaking test. When the arcing time is greater than or equal to 40ms for the first time, the current short-circuit current is taken as the starting point of the critical short-circuit current range. When the arcing time is less than 40ms for the first time, the current short-circuit current is taken as the ending point of the critical short-circuit current range.

[0044] S25. Based on the starting point and the ending point, the critical short-circuit current range of the circuit breaker to be adjusted is obtained.

[0045] Based on the above starting point and ending point, the current values ​​at both ends of a critical short-circuit current range can be obtained. By successively selecting (1~k) times the rated current In as the short-circuit current for breaking tests, the entire critical short-circuit current range can be obtained.

[0046] Short-circuit currents within the critical short-circuit current range cannot quickly and effectively transfer from the moving and stationary contacts to the arc-extinguishing chamber due to insufficient energy in the generated arc. Furthermore, because the voltage between the moving and stationary contacts is high, the arc cannot be broken through the gap, causing the arc to remain burning continuously in the gap between the moving and stationary contacts and the arc-extinguishing chamber. This significantly prolongs or doubles the arcing time, leading to severe burn-out of the circuit breaker contacts and the arc-extinguishing chamber. Therefore, it is necessary to obtain the arcing time through a breaking experiment and compare it with 40ms. If the arcing time is greater than 40ms, the selected short-circuit current at this time is taken as a current value within the critical short-circuit current range. The critical short-circuit current range can be determined using the above method.

[0047] In one possible embodiment, when the rated voltage Ue of the circuit breaker to be adjusted is an AC voltage of 1140V, the critical short-circuit current range is (3~5) times the rated current In.

[0048] See Figure 3 , Figure 3 A schematic diagram of a critical short-circuit current range provided in an embodiment of this application is shown below. Figure 3 As shown, taking a circuit breaker to be adjusted with a rated voltage Ue of AC1140V as an example, based on the above method for obtaining the critical short-circuit current range of the circuit breaker to be adjusted, the following results were obtained through a breaking experiment: when the rated voltage Ue of the circuit breaker to be adjusted is AC voltage of 1140V, the critical short-circuit current range is (3~5) times the rated current In.

[0049] From Table 1, we can see that when the rated voltage Ue of the circuit breaker to be adjusted is AC1140V, the rated short-circuit breaking current Ics is 65KA, the rated current In is 6300A, and (3~5) times the rated current In is 20KA~30KA. Therefore, the critical short-circuit current range is 20KA~30KA.

[0050] See Figure 3In one example, when the rated voltage Ue of the circuit breaker to be adjusted is AC1140V, under normal circumstances, when the short-circuit current on the main circuit is less than 65kA, reliable protection can be achieved by the circuit breaker's breaking action. For any value in the critical short-circuit current range (i.e., the critical short-circuit current), although the critical short-circuit current of 20kA~30kA is much less than 65kA, the energy of the generated arc is insufficient to quickly and effectively transfer from the moving contact and stationary contact to the arc-extinguishing chamber. Moreover, due to the high voltage between the moving contact and stationary contact, the arc cannot be broken by the opening gap, causing the arc to remain in the gap between the moving contact, stationary contact and the arc-extinguishing chamber and continue to burn. The arcing time is greatly extended or doubled, resulting in severe burn-out of the circuit breaker's contacts and arc-extinguishing chamber, making reliable breaking impossible. Therefore, the circuit breaker cannot reliably protect against the rated short-circuit breaking current between 20kA and 30kA.

[0051] In one possible embodiment, step S4 above includes: S41, the first ratio is adjusted within the first preset ratio range, and the circuit breaker to be adjusted performs breaking tests sequentially with the target short-circuit current as the short-circuit current according to the value of the first ratio.

[0052] This application provides two methods for determining the target ratio of a circuit breaker to be adjusted. One method is to determine it based on the arcing time obtained from a breaking test. Specifically, the first ratio is adjusted within the range of 1.2 to 1.4. Based on the value of the first ratio within the range of 1.2 to 1.4, a breaking test is performed on the circuit breaker to be adjusted, and the target short-circuit current is used as the breaking current during the breaking test.

[0053] S42, record the arcing time obtained from each breaking test. When the arcing time is less than 40ms, determine the current value of the first ratio as the target ratio of the circuit breaker to be adjusted.

[0054] Record the arcing time obtained from each breaking test. When the arcing time is less than 40ms, determine the current value of the first ratio as the target ratio of the circuit breaker to be adjusted. For example, for a circuit breaker with a rated voltage Ue of AC1140V and a critical short-circuit current range of 20KA~30KA, adjust the first ratio (i.e., D2 / D1) within the range of 1.2~1.4. When the first ratio (i.e., D2 / D1) is 1.3, conduct a breaking test on the circuit breaker to be adjusted with a breaking current of 25KA. If the arcing time obtained from the breaking test is less than 40ms, then determine the current value of the first ratio, 1.3, as the target ratio of the circuit breaker to be adjusted, i.e., the target ratio is 1.3. Adjust the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted according to 1.3. After adjustment, the circuit breaker to be adjusted can reliably break at 25KA.

[0055] In one possible embodiment, step S4 above further includes: S43, the first ratio is adjusted within the first preset ratio range, and the circuit breaker to be adjusted performs breaking tests sequentially with the target short-circuit current as the short-circuit current according to the value of the first ratio.

[0056] This application provides another method for determining the target ratio of a circuit breaker to be adjusted, namely, determining it based on the number of breaks obtained from a breaking test. Specifically, the first ratio is adjusted within the range of 1.2 to 1.4. Based on the value of the first ratio within the range of 1.2 to 1.4, a breaking test is performed on the circuit breaker to be adjusted, and the target short-circuit current is used as the breaking current during the breaking test.

[0057] S44, record the number of breaks obtained in each break test, select the maximum value among the number of breaks, and determine the current value of the first ratio corresponding to the maximum value among the number of breaks as the target ratio of the circuit breaker to be adjusted.

[0058] Record the number of breaks obtained in each breaking test, select the maximum value among the breaking tests, and determine the current value of the corresponding first ratio as the target ratio of the circuit breaker to be adjusted. For example, for a circuit breaker with a rated voltage Ue of AC1140V and a critical short-circuit current range of 20KA~30KA, the first ratio (i.e., D2 / D1) is adjusted within the range of 1.2~1.4. When the first ratio (i.e., D2 / D1) is 1.2, 1.25, 1.3, and 1.4 respectively, break tests are performed on the circuit breaker to be adjusted with 25KA as the breaking current. The number of breaks is recorded each time. If the first ratio (D2 / D1) is 1.2, the number of breaks is 3; if the first ratio (D2 / D1) is 1.25, the number of breaks is 5; if the first ratio (D2 / D1) is 1.3, the number of breaks is 10; if the first ratio (D2 / D1) is 1.4, the number of breaks is 6. The current value of the first ratio (1.3) corresponding to the maximum number of breaks (10) is determined as the target ratio of the circuit breaker to be adjusted, i.e., the target ratio is 1.3. The arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted are adjusted according to 1.3. After adjustment, the circuit breaker to be adjusted can reliably break at 25kA.

[0059] In one possible embodiment, the first ratio ranges from 1.1 to 1.5.

[0060] In currently used circuit breakers, the value range of the first ratio (i.e., D2 / D1) is usually 1.1 to 1.5. The first preset ratio range provided in this application is 1.2 to 1.4. It can be seen that the first preset ratio range is smaller than the value range of the first ratio. By adjusting the ratio of the arc contact opening distance to the main contact opening distance of the circuit breaker to be adjusted from 1.1 to 1.5 to the range of 1.2 to 1.4, the circuit breaker to be adjusted can suppress the phenomenon of unreliable breaking in the critical short-circuit current range, thereby improving the reliability of the circuit breaker in breaking within the rated short-circuit breaking current range.

[0061] This application also provides a circuit breaker contact system parameter adjustment device. See [link to relevant documentation] Figure 4 , Figure 4 A schematic diagram of a circuit breaker contact system parameter adjustment device provided in this application embodiment is shown below. Figure 4 As shown, the device includes: The first acquisition module 401 is used to acquire the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted; The second acquisition module 402 is used to acquire the critical short-circuit current range of the circuit breaker to be adjusted. Calculation module 403 is used to calculate the ratio of the arc contact opening distance to the main contact opening distance to obtain the first ratio; The determining module 404 is used to adjust the first ratio within a first preset ratio range. The circuit breaker to be adjusted is subjected to a breaking test with the target short-circuit current as the short-circuit current according to the value of the first ratio. Based on the arcing time or breaking number obtained from the breaking test, the target ratio of the circuit breaker to be adjusted is determined so that the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. The first preset ratio range is 1.2 to 1.4, the target ratio is any value in the first preset ratio range, and the target short-circuit current is any value in the critical short-circuit current range.

[0062] This application also provides an electronic device, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the program, it implements the above-described steps of the circuit breaker contact system parameter adjustment method.

[0063] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0064] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0065] In another embodiment provided in this application, a computer-readable storage medium is also provided, which stores a computer program that, when executed by a processor, implements any of the methods described in the above embodiments.

[0066] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0067] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A circuit breaker contact system parameter adjustment method characterized by, The method for adjusting the parameters of the circuit breaker contact system includes: Obtain the arc contact opening distance and main contact opening distance of the circuit breaker to be adjusted; Obtain the critical short-circuit current range of the circuit breaker to be adjusted; Calculate the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; The first ratio is adjusted within a first preset ratio range. The circuit breaker to be adjusted is tested with the target short-circuit current as the short-circuit current according to the value of the first ratio. The target ratio of the circuit breaker to be adjusted is determined based on the arcing time or number of breaks obtained from the breaking test, so that the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. Wherein, the first preset ratio range is 1.2 to 1.4, the target ratio is any value in the first preset ratio, and the target short-circuit current is any value in the critical short-circuit current range.

2. The circuit breaker contact system parameter adjustment method of claim 1, wherein, The step of obtaining the critical short-circuit current range of the circuit breaker to be adjusted includes: Obtain the rated short-circuit breaking current Ics and rated current In of the circuit breaker to be adjusted; Calculate the ratio of the rated short-circuit breaking current Ics to the rated current In to obtain the first ratio k, where k is a positive integer; Select (1~k) times the rated current In sequentially as the short-circuit current for breaking tests, and record the arcing time obtained in each breaking test; When the arcing time is greater than or equal to 40ms for the first time, the current short-circuit current is taken as the starting point of the critical short-circuit current interval; when the arcing time is less than 40ms for the first time, the current short-circuit current is taken as the ending point of the critical short-circuit current interval. Based on the starting point and the ending point, the critical short-circuit current range of the circuit breaker to be adjusted is obtained.

3. The circuit breaker contact system parameter adjustment method of claim 2, wherein, When the rated voltage Ue of the circuit breaker to be adjusted is an AC voltage of 1140V, the critical short-circuit current range is (3~5) times the rated current In.

4. The circuit breaker contact system parameter adjustment method of claim 1, wherein, The step of adjusting the first ratio within a first preset ratio range, wherein the circuit breaker to be adjusted performs a breaking test using the target short-circuit current as the short-circuit current according to the value of the first ratio, and determines the target ratio of the circuit breaker to be adjusted based on the arcing time or number of breaking times obtained from the breaking test, includes: The first ratio is adjusted within the first preset ratio range, and the circuit breaker to be adjusted performs breaking tests sequentially with the target short-circuit current as the short-circuit current according to the value of the first ratio. Record the arcing time obtained from each break test. When the arcing time is less than 40ms, determine the current value of the first ratio as the target ratio of the circuit breaker to be adjusted.

5. The circuit breaker contact system parameter adjustment method of claim 1, wherein, The step of adjusting the first ratio within a first preset ratio range, wherein the circuit breaker to be adjusted performs a breaking test using the target short-circuit current as the short-circuit current according to the value of the first ratio, and determines the target ratio of the circuit breaker to be adjusted based on the arcing time or number of breaking tests obtained from the breaking test, further includes: The first ratio is adjusted within the first preset ratio range, and the circuit breaker to be adjusted performs breaking tests sequentially with the target short-circuit current as the short-circuit current according to the value of the first ratio. Record the number of breaks obtained from each break test, select the maximum value among the number of breaks, and determine the current value of the first ratio corresponding to the maximum value among the number of breaks as the target ratio of the circuit breaker to be adjusted.

6. The circuit breaker contact system parameter adjustment method of claim 1, wherein, The first ratio ranges from 1.1 to 1.

5.

7. A circuit breaker contact system parameter adjustment device characterized by, The circuit breaker contact system parameter adjustment device includes: The first acquisition module is used to acquire the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted; The second acquisition module is used to acquire the critical short-circuit current range of the circuit breaker to be adjusted. The calculation module is used to calculate the ratio of the arc contact opening distance to the main contact opening distance to obtain a first ratio; The determining module is used to adjust the first ratio within a first preset ratio range. The circuit breaker to be adjusted performs a breaking test using a target short-circuit current as the short-circuit current, based on the value of the first ratio. The target ratio of the circuit breaker to be adjusted is determined based on the arcing time or number of breaking tests obtained from the breaking test, so that the arc contact opening distance and the main contact opening distance of the circuit breaker to be adjusted are adjusted according to the target ratio. The first preset ratio range is 1.2 to 1.4, the target ratio is any value within the first preset ratio range, and the target short-circuit current is any value within the critical short-circuit current range.

8. An electronic device, comprising: The electronic device includes a processor and a memory; the memory stores at least one piece of program code, which is executed by the processor to implement the circuit breaker contact system parameter adjustment method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The storage medium stores at least one piece of program code, which is executed by a processor to implement the circuit breaker contact system parameter adjustment method as described in any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, The computer program product has at least one line of program code, which is executed by a processor to implement the circuit breaker contact system parameter adjustment method as described in any one of claims 1 to 6.

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