CN113806913A - Prediction method of arc extinguishing chamber life of SF6 circuit breaker based on arc energy - Google Patents
Prediction method of arc extinguishing chamber life of SF6 circuit breaker based on arc energy Download PDFInfo
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Abstract
本发明公开了一种基于电弧能量的SF6断路器灭弧室寿命预测方法，包括以下步骤：对额定累积弧能进行计算；对断路器已承受的电弧能量进行计算；灭弧室的剩余使用寿命由断路器已承受电弧能量与额定累积弧能的比值求得。本发明采用在线测量电弧能量的装置测量电弧电压，再加上电流互感器测量电弧电流，实现在线求取电弧能量值。在此基础上，灭弧室寿命预测的新方法在人工短路试验进行验证。试验结果表明，新方法的寿命预测结果比传统方法更佳，与实际情况更为吻合。电弧电压随着电弧电流不断变化，所以用电弧能量作为寿命评估更加合适。本方法有利于实现断路器灭弧室在线状态评估。
The invention discloses a method for predicting the life of an arc extinguishing chamber of an SF6 circuit breaker based on arc energy, comprising the following steps: calculating the rated cumulative arc energy; calculating the arc energy that the circuit breaker has endured; The life is calculated by the ratio of the arc energy the circuit breaker has endured to the rated accumulated arc energy. The invention adopts the device for measuring arc energy on-line to measure the arc voltage, and the current transformer is added to measure the arc current, so as to obtain the arc energy value online. On this basis, the new method of arc interrupter life prediction is verified in artificial short-circuit test. The test results show that the life prediction result of the new method is better than the traditional method and more consistent with the actual situation. The arc voltage is constantly changing with the arc current, so it is more appropriate to use the arc energy as a life estimate. The method is beneficial to realize the online state evaluation of the arc extinguishing chamber of the circuit breaker.
Description
Technical Field
The invention relates to an SF based on arc energy6A life prediction method for an arc extinguish chamber of a circuit breaker belongs to the technical field of evaluation of the arc extinguish chamber of the circuit breaker.
Background
The high-voltage circuit breaker is the most important protection and control equipment of a power system, and the service life of the SF6 circuit breaker is increasingly highlighted along with the extension of the running time, wherein the failure of the circuit breaker can cause the expansion of the accident range, so that the reliability of a power grid is reduced. Therefore, effective evaluation of the state of the circuit breaker has very important significance for preventing accidents and improving the stability of a power grid. The circuit breaker consists of three parts: the arc extinguishing chamber, the control unit and the operating mechanism.
Most circuit breaker faults occur in the arc chute. The evaluation of the state of the arc chute is difficult compared to other parts of the circuit breaker. The main reason is that in the switching-on and switching-off process of the circuit breaker, part of energy of arc burning is absorbed by a contact and a nozzle in an arc extinguishing chamber, and the thermal process causes contact erosion and nozzle ablation. Resulting in an increased rate of breaker failure. Different characteristic parameters are currently used to evaluate the state of the arc extinguishing chamber. These parameters include the number of switching on and off, the dynamic and static resistance of the contacts, the amount of charge, and the arc voltage and current. But these parameters do not allow real-time status monitoring of the stylus and the spout.
Aiming at the abrasion condition of the arc extinguish chamber of the circuit breaker, a plurality of researches on the state evaluation of the arc extinguish chamber of the circuit breaker are carried out at present, and certain achievements are obtained.
Publication No. CN1645534A, entitled method for inspecting a circuit breaker, relates to a method for inspecting a circuit breaker having a fixed contact and a moving contact, which have one secondary contact and one main contact, respectively, wherein the moving contact is moved by a controllable motor. The switching process is carried out with a predeterminable movement process, wherein during the switching process a measurement value of the drive current of the electric motor and/or a measurement value of the displacement which the moving contact has traversed is recorded. The recorded measured values are taken into account for evaluating the state of the contact or the state of the transmission chain.
The defects of the method are as follows: the dynamic resistance is the resistance corresponding to the static loop resistance, i.e. the arcing contact resistance, which needs to be measured during the dynamic phase of the circuit breaker opening. This parameter reflects the combined effect of the arc contact resistance and the arc contact travel, and has long been used in the state evaluation of the breaker contacts, but it is time-consuming and complex, and is only used for the off-line detection of the breaker, and is not suitable for the on-line monitoring.
The method is mainly characterized in that a discharge gap formed by a floating potential body is arranged at a position with certain electric field intensity in a vacuum arc-extinguishing chamber; when the vacuum arc extinguish chamber is in the normal range of operating voltage and vacuum degree, the discharge gap does not discharge; when the vacuum degree of the vacuum arc-extinguishing chamber is reduced, so that the insulation strength is reduced, the discharge gap discharges; the vacuum degree of the vacuum arc-extinguishing chamber is detected on line by detecting the discharge condition of the discharge gap. The invention has simple structure and realization and can carry out on-line detection.
Therefore, the above method has the following defects: the sum of the successful on-off currents was measured using a laboratory manual short circuit test. The remaining life of the circuit breaker is the ratio of the current that has been switched off to the sum of the currents that can be switched off. The disadvantage of this method is that only the magnitude of the current is taken into account, and the combined consideration of the arc time and the arc voltage is lacking.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for predicting the service life of an arc extinguish chamber of an SF6 circuit breaker based on arc energy, wherein an arc voltage device is used for measuring arc voltage on line, so that the device can bear transient recovery voltage and can effectively inhibit measurement noise; and evaluating the residual effective life of the arc extinguishing chamber according to the measurement results of the arc voltage and the arc current.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
SF based on electric arc energy6The method for predicting the service life of the arc extinguish chamber of the circuit breaker comprises the following steps:
step S1, calculating the rated accumulated arc energy;
step S2, calculating the arc energy born by the breaker;
and step S3, the residual service life of the arc extinguish chamber is obtained by the ratio of the arc energy born by the circuit breaker to the rated accumulated arc energy. As a further improvement of the present invention, the rated accumulated arc energy is a sum of arcing energy that the arc-extinguishing chamber can bear in the whole life cycle, and there are two calculation methods, the first calculation method is: repeating the manual short circuit breaking test until the arc extinguish chamber fails to break; measuring the arc energy of each time in a short circuit breaking test, and summing to obtain rated accumulated arc energy; the second calculation method is as follows: obtaining the operation times of the circuit breaker from a circuit breaker operation manual, then carrying out an artificial short circuit breaking test, and recording the energy of the electric arc; the nominal cumulative arc energy is equal to the average experimentally measured arc energy multiplied by the number of circuit breaker operations life.
As a further improvement of the present invention, the second calculation method performs a calculation formula of the rated cumulative arc energy as follows:
AEarc＝N×Er (1)
in the formula, AEarcIs the rated cumulative arc energy; n is the number of times the circuit breaker is operated life; erIs the arc energy measured by the circuit breaker when breaking the rated short circuit current test.
As a further improvement of the invention, the calculation formula of the arc energy that the circuit breaker has endured is as follows:
wherein E is the arc energy; u (t) is the arc voltage; i (t) is the arc current, tarcIs the arcing time.
As a further improvement of the invention, the life index prediction formula after the K operation of the circuit breaker is as follows:
in the formula, AEarcRepresenting rated accumulated arc energy; eiIs the arc energy during the ith operation; RLkIs the remaining life of the arc chute after the kth operation; TL is the total life of the arc chute related to the rated number of disconnections.
As a further development of the invention, the arc voltage is measured with an arc voltage measuring device; the arc current is measured by a current transformer;
the arc voltage measuring device comprises a circuit breaker, a capacitive voltage divider, a power switch, a transient diode, a voltage buffer, an isolation amplifier, a light transmitter-signal receiver, a signal processing unit and a switch control unit.
As a further improvement of the invention, the capacitive voltage divider is connected in parallel on the source side and the load side of the circuit breaker; the power switch is electrically connected between the capacitive voltage divider and the transient diode; the transient diode is electrically connected with the voltage buffer and the isolation amplifier; the voltage buffer is connected with the isolation amplifier in a bidirectional way; the switch control unit acquires the information of the voltage buffer and controls the power switch; the isolation amplifier is electrically connected with the optical transmitter-signal receiver; the optical transmitter-signal receiver transmits the signal to the signal processing unit.
As a further improvement of the invention, the output end of the capacitive voltage divider is connected in series with a filter, and is connected in series with a transient diode after passing through the filter, and the transient diode is connected in series with a resistor for limiting high-energy impact; and a shielding box is fixedly arranged on the outer side of the transient diode and the series resistor thereof.
As a further development of the invention, the arc voltage measuring device is connected to the power supply network via a relay switch; when the secondary protection device sends out a tripping signal of the circuit breaker, the relay acts; the disconnection of the relay is realized by using transient recovery voltage; in the loop, a voltage buffer is used for protecting the main circuit from voltage impact; comparing the output of the voltage buffer to a reference voltage, the reference voltage being scaled to be 3-6 times higher than the arc voltage; the relay is then opened if the voltage data obtained at the voltage buffer exceeds a reference value.
As a further improvement of the invention, the artificial short circuit test is adopted to carry out SF of 24kV6Testing the performance of the arc voltage measuring device on the circuit breaker; and comparing and verifying the predicted result and the actual test.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the invention adopts a device for measuring the arc energy on line to measure the arc voltage, and a current transformer is added to measure the arc current, thus realizing the on-line acquisition of the arc energy value. The device has the advantages that the device can bear transient recovery voltage, and can effectively eliminate electrostatic noise and electromagnetic noise, thereby accurately measuring arc voltage. On the basis, the new method for predicting the service life of the arc extinguish chamber is verified in an artificial short circuit test. The test result shows that the service life prediction result of the new method is better than that of the traditional method and is more consistent with the actual situation. The arc voltage varies with the arc current, so it is more appropriate to use the arc energy as a life evaluation. The method is beneficial to realizing the on-line state evaluation of the arc extinguish chamber of the circuit breaker.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Figure 1 is a schematic view of the structure of an arc chamber of a circuit breaker;
FIG. 2 is a graph of 24kV SF6 circuit breaker arc voltage waveforms;
FIG. 3 is a functional block diagram of a measuring device;
FIG. 4 is a schematic diagram of a laboratory test apparatus;
FIG. 5 is a graph of recorded arc voltage and arc current waveforms;
FIG. 6 is a recorded real-time arc energy waveform;
figure 7 is a graph comparing arc voltage waveforms at two different fault currents.
Wherein, 1 static arc contact, 2 moving arc contacts, 3 spouts, 4 main contacts.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting.
Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Fig. 1 shows the basic structure of the arc chute. Nozzle 3 for generating SF for cooling the arc6And (4) air flow. When the circuit breaker acts, the arc burning generated by the contact of the moving arc contact 2 and the static arc contact 1 in the high-current stage can block the gas from flowing through the nozzleIt becomes "nozzle clogging". The spout blockage is more or less accompanied by evaporation of the spout 3 material, resulting in ablation of the spout 3.
The wear of the arc-extinguishing chamber is mainly SF6Erosion of the arcing contacts in the circuit breaker and ablation of the nozzle. When the heat in the arc column is intensively transferred to the surface of the contact in the fault current breaking process, the heat distribution in the form of heat conduction is very uneven, a small part of the contact material is locally and rapidly heated to the vaporization temperature, the turbulent flow characteristic is presented, the metal plasma jet flow is the mode of separating the material from the motor, and the mechanism is considered to be the main reason of contact erosion. The amount of erosion of the contacts is related to the arc energy, the arcing time, and the size and shape of the contacts as well as the material properties. The immediate consequence of contact erosion is contact deformation, embodied in increased surface roughness and reduced contact length. These adverse effects will affect the current switching process of the main contacts 4 and the arcing contacts (the moving arcing contact 2 and the fixed arcing contact 1) and the dielectric insulation performance of the gap, thereby reducing the opening reliability of the circuit breaker.
SF based on electric arc energy6The method for predicting the service life of the arc extinguish chamber of the circuit breaker comprises the following steps:
step S1, calculating the rated accumulated arc energy;
step S2, calculating the arc energy born by the breaker;
and step S3, the residual service life of the arc extinguish chamber is obtained by the ratio of the arc energy born by the circuit breaker to the rated accumulated arc energy. In this embodiment, the rated accumulated arc energy is a sum of arcing energy that the arc extinguish chamber can bear in the whole life cycle, and there are two calculation methods, the first calculation method is: repeating the manual short circuit breaking test until the arc extinguish chamber fails to break; measuring the arc energy of each time in a short circuit breaking test, and summing to obtain rated accumulated arc energy;
the second calculation method is as follows: obtaining the operation times of the circuit breaker from a circuit breaker operation manual, then carrying out an artificial short circuit breaking test, and recording the energy of the electric arc; the nominal cumulative arc energy is equal to the average experimentally measured arc energy multiplied by the number of circuit breaker operations life.
Further, in this embodiment, the second calculation method performs the following calculation formula of the rated cumulative arc energy:
AEarc＝N×Er (1)
in the formula, AEarcIs the rated cumulative arc energy; n is the number of times the circuit breaker is operated life; erIs the arc energy measured by the circuit breaker when breaking the rated short circuit current test.
Further to this embodiment, the calculation formula of the arc energy that the circuit breaker has endured is as follows:
wherein E is the arc energy; u (t) is the arc voltage; i (t) is the arc current, tarcIs the arcing time.
Further, the life index prediction formula after the kth operation of the circuit breaker is as follows:
in the formula, AEarcRepresenting rated accumulated arc energy; eiIs the arc energy during the ith operation; RLkIs the remaining life of the arc chute after the kth operation; TL is the total life of the arc chute related to the rated number of disconnections.
When a fault current flows through the circuit breaker main contacts, the circuit breaker break voltage is about tens of millivolts. When the circuit breaker is opened, the main contacts are separated, the current path is switched from the main contacts to the arc contacts, and the break voltage of the circuit breaker is about hundreds of millivolts. And when the arcing contacts just separate, the current density increases dramatically, forming a molten metal bridge. The continuous rise in current density and temperature of the metal bridge eventually leads to evaporation of the metal bridge. When the gap distance between the contacts is several micrometers, the arc is filled with a large amount of metal vapor. The arc is now in the metallic phase. When the gap between the contacts is increased, the gas around the arc is electrifiedThe ions thereby become part of an arc that is transformed from a metal phase to a gas phase. When the metal phase is formed, the arc voltage is increased to about 10V to 15V. Then during the transition of the arc from the metallic phase to the gaseous phase, the arc path impedance rises, resulting in a rise in the arc voltage. The arc voltage during arcing is on the order of several hundred volts. When the arc current approaches 0, the arc voltage rises abruptly and has a high amplitude. 24kV SF6A graph of the arc voltage recording for the circuit breaker is shown in figure 2.
Further to this embodiment, the arc voltage is measured with an arc voltage measuring device; the arc current is measured by a current transformer;
the arc voltage measuring device comprises a circuit breaker, a capacitive voltage divider, a power switch, a transient diode, a voltage buffer, an isolation amplifier, a light transmitter-signal receiver, a signal processing unit and a switch control unit.
Further to this embodiment, the capacitive voltage divider is connected in parallel to the source side and the load side of the circuit breaker; the power switch is electrically connected between the capacitive voltage divider and the transient diode; the transient diode is electrically connected with the voltage buffer and the isolation amplifier; the voltage buffer is connected with the isolation amplifier in a bidirectional way; the switch control unit acquires the information of the voltage buffer and controls the power switch; the isolation amplifier is electrically connected with the optical transmitter-signal receiver; the optical transmitter-signal receiver transmits the signal to the signal processing unit.
Fig. 3 is a schematic diagram of a measurement system. The capacitive voltage divider is used for reducing the transient recovery voltage amplitude, can realize the electrical isolation of the circuit breaker and the measuring system, and also eliminates the measurement error caused by the grounding loop of the circuit breaker and the measuring system. Due to the low amplitude input requirements of the isolation amplifier and the optical transmitter, the TVS transient diode series resistor is adopted to limit high energy impact. The voltage signal isolation is realized by an isolation amplifier. The light projector component is used to prevent electromagnetic interference in signal transmission.
Further, in this embodiment, the output end of the capacitive voltage divider is connected in series with a filter, and is connected in series with a transient diode after passing through the filter, and the transient diode is connected in series with a resistor for limiting high energy impact; and a shielding box is fixedly arranged on the outer side of the transient diode and the series resistor thereof.
Further, the arc voltage measuring device is connected to the grid through a relay switch; when the secondary protection device sends out a tripping signal of the circuit breaker, the relay acts; the disconnection of the relay is realized by using transient recovery voltage; in the loop, a voltage buffer is used for protecting the main circuit from voltage impact; comparing the output of the voltage buffer to a reference voltage, the reference voltage being scaled to be 3-6 times higher than the arc voltage; the relay is then opened if the voltage data obtained at the voltage buffer exceeds a reference value.
Further to this example, an artificial short circuit test was performed at 24kV SF6Testing the performance of the arc voltage measuring device on the circuit breaker; and comparing and verifying the predicted result and the actual test.
Specifically, as shown in fig. 4, the artificial short circuit test loop includes two parallel branches. The left branch circuit simulates to generate short-circuit fault current, and the right branch circuit simulates to generate transient recovery voltage between fractures after the arc is extinguished. In order to measure the arc voltage during the experiment, a measuring device is connected to the output of a capacitive voltage divider connected in parallel with the circuit breaker. To limit the transient recovery voltage amplitude during circuit breaker operation, the voltage division ratio is set to 1: 2000. Therefore, the transient recovery voltage amplitude will be reduced to several tens of volts. The output signal of the measuring system will be transmitted to the control room, from which the arc voltage can be measured accurately.
Fig. 5 is a diagram showing the waveforms of the arc voltage and the arc current of the breaker breaking rated short-circuit current (25kA) in the test, and the short-circuit arcing time is 13 ms-14 ms. Fig. 6 is a graph of the calculated arc energy for the same parameter experiment. Under the working condition of the existing circuit breaker, the rated arc energy calculated by the formula (2) is about 40 kJ. Then, the rated cumulative arc energy is calculated by equation (1). According to the test breaker manual, N takes a value of 20. Therefore, the rated cumulative arc can be 800 kJ. This value is valid for any one circuit breaker of the same model.
The remaining useful life of the arc extinguishing chamber can be calculated by equation (3). A total of 6 tests of different arcing times and amplitudes were performed to compare the accuracy of the life predictions of the new and conventional methods. According to the formula (3), the residual effective life of the arc-extinguishing chamber after 6 times of breaking operations is calculated by adopting a new method to be 80.6%, and the residual effective life of the arc-extinguishing chamber according to the traditional method is only 70%. The prediction results of the two methods are more and more different with the increase of the operation times. The reason is that the conventional prediction method does not take into account the difference in arc energy during each operation.
The failure of the arc chute is directly related to the arc energy, which is related to the arc voltage. On the other hand, the arc voltage varies with the arc current, for example, the average value of the arc voltage is 202V at 9.3kA and 175V at 25 kA. Therefore, predicting arc chamber life using arc energy is most straightforward and accurate. A comparison of the arc voltage waveforms at two different fault currents (9.3kA and 25kA) is shown in fig. 7.
Claims (10)
1. SF based on electric arc energy6The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized by comprising the following steps of:
step S1, calculating the rated accumulated arc energy;
step S2, calculating the arc energy born by the breaker;
and step S3, the residual service life of the arc extinguish chamber is obtained by the ratio of the arc energy born by the circuit breaker to the rated accumulated arc energy.
2. SF according to claim 16The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that the rated accumulated arc energy is the sum of the arcing energy borne by the arc extinguish chamber in the whole service life cycle, and the calculation methods are two, wherein the first calculation method comprises the following steps: repeating the manual short circuit breaking test until the arc extinguish chamber fails to break; measuring the arc energy of each time in a short circuit breaking test, and summing to obtain rated accumulated arc energy;
the second calculation method is as follows: obtaining the operation times of the circuit breaker from a circuit breaker operation manual, then carrying out an artificial short circuit breaking test, and recording the energy of the electric arc; the nominal cumulative arc energy is equal to the average experimentally measured arc energy multiplied by the number of circuit breaker operations life.
3. SF according to claim 26The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that a calculation formula of rated accumulated arc energy by a second calculation method is as follows:
AEarc＝N×Er (1)
in the formula, AEarcIs the rated cumulative arc energy; n is the number of times the circuit breaker is operated life; erIs the arc energy measured by the circuit breaker when breaking the rated short circuit current test.
4. SF according to claim 36The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that the calculation formula of the arc energy born by the circuit breaker is as follows:
wherein E is the arc energy; u (t) is the arc voltage; i (t) is the arc current, tarcIs the arcing time.
5. SF according to arc energy6The life prediction method for the arc extinguish chamber of the circuit breaker is characterized in that the life index prediction formula after the K-th operation of the circuit breaker is as follows:
in the formula, AEarcRepresenting rated accumulated arc energy; eiIs the arc energy during the ith operation; RLkIs the remaining life of the arc chute after the kth operation; TL is rated number of times of disconnectionNumber dependent total arc chute life.
6. SF according to claim 56The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that the arc voltage is measured by an arc voltage measuring device; the arc current is measured by a current transformer;
the arc voltage measuring device comprises a circuit breaker, a capacitive voltage divider, a power switch, a transient diode, a voltage buffer, an isolation amplifier, a light transmitter-signal receiver, a signal processing unit and a switch control unit.
7. SF according to claim 66The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that the capacitive voltage divider is connected in parallel to the source side and the load side of the circuit breaker; the power switch is electrically connected between the capacitive voltage divider and the transient diode; the transient diode is electrically connected with the voltage buffer and the isolation amplifier; the voltage buffer is connected with the isolation amplifier in a bidirectional way; the switch control unit acquires the information of the voltage buffer and controls the power switch; the isolation amplifier is electrically connected with the optical transmitter-signal receiver; the optical transmitter-signal receiver transmits the signal to the signal processing unit.
8. SF according to claim 76The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that the output end of the capacitive voltage divider is connected with a filter in series, and is connected with a transient diode in series after passing through the filter, wherein the transient diode is connected with a resistor for limiting high-energy impact in series; and a shielding box is fixedly arranged on the outer side of the transient diode and the series resistor thereof.
9. SF according to claim 86The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that the arc voltage measuring device is connected with a power grid through a relay switch; when the secondary protection device sends out the tripping of the circuit breakerAfter the signal, the relay acts; the disconnection of the relay is realized by using transient recovery voltage; in the loop, a voltage buffer is used for protecting the main circuit from voltage impact; comparing the output of the voltage buffer to a reference voltage, the reference voltage being scaled to be 3-6 times higher than the arc voltage; the relay is then opened if the voltage data obtained at the voltage buffer exceeds a reference value.
10. SF according to claim 96The method for predicting the service life of the arc extinguish chamber of the circuit breaker is characterized in that the performance of an arc voltage measuring device is tested on a 24kVSF6 circuit breaker by adopting an artificial short circuit test; and comparing and verifying the predicted result and the actual test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110943792.6A CN113806913B (en) | 2021-08-17 | 2021-08-17 | SF based on arc energy 6 Method for predicting service life of arc extinguishing chamber of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110943792.6A CN113806913B (en) | 2021-08-17 | 2021-08-17 | SF based on arc energy 6 Method for predicting service life of arc extinguishing chamber of circuit breaker |
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| CN115407188A (en) * | 2022-09-05 | 2022-11-29 | 浙江省计量科学研究院 | Device and method for detecting service life of built-in relay of electric energy meter |
| CN117349710A (en) * | 2023-12-04 | 2024-01-05 | 七七七电气科技有限公司 | Method for predicting breaking capacity of vacuum arc-extinguishing chamber, electronic equipment and medium |
| CN118209853A (en) * | 2024-04-28 | 2024-06-18 | 南方电网科学研究院有限责任公司 | A method and system for predicting the effective remaining electrical life of a high voltage circuit breaker |
| WO2025104777A1 (en) * | 2023-11-13 | 2025-05-22 | 三菱電機株式会社 | Contact wear monitoring device |
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