A temperature measurement and status diagnosis method based on lightning arrester

Abstract

The present invention discloses a temperature measurement and state diagnosis method based on a lightning arrester. The temperature of the internal valve plate is measured by a built-in monitoring unit according to a certain energy-saving strategy based on a built-in monitoring arrester to achieve the purpose of reducing the average temperature measurement energy consumption, so as to cope with the limitation of the low power consumption of the built-in monitoring arrester; after the temperature data is sent to a remote monitoring terminal by wireless communication, the remote monitoring terminal determines the state of the lightning arrester according to a certain diagnostic method based on the received data. After the present invention is applied, low-power temperature measurement is realized on the basis of the low power consumption of the built-in monitoring arrester, which ensures the reliable realization of the temperature measurement function of the built-in monitoring arrester; the method of diagnosing the arrester state from the arrester temperature data provided by the present invention makes up for the omission of the built-in monitoring arrester.

Description

Technical Field

[0001] The invention belongs to the technical field of lightning arresters, and in particular relates to a temperature measurement and state diagnosis method based on a lightning arrester. Background Art

[0002] As an important device in the power system, the safety and stability of the lightning arrester are directly related to the normal operation of the power system. The lightning arrester suppresses the overvoltage of the power system by absorbing energy. Long-term operation will inevitably lead to performance degradation, so it is necessary to monitor its status online to ensure its safe operation.

[0003] In the past, there have been many practices that have shown that the temperature of the valve plate inside the arrester is an important factor reflecting the state of the arrester. Figure 1 In actual operation, the arrester has internal and external heat sources. The external heat source is the atmospheric environment, light and other factors, and the internal heat source is the zinc oxide valve plate. The impact of the external heat source on the three-phase arrester at the same location is basically the same, and can be eliminated through horizontal comparison; the heating power and heat generation of the internal heat source are directly related to the state of the arrester. Figure 2 , the left is the equivalent circuit model of the arrester in steady state (only for gapless arrester), and the right is the equivalent circuit model of the arrester when absorbing impulse current. When the arrester is aged or damp, it can be equivalent to R v The decrease of the arrester heating power will increase and the temperature will rise in the steady state. When lightning strikes, the impact current flowing through the arrester is several orders of magnitude larger than the power frequency leakage current. The arrester is equivalent to a nonlinear resistor, which will instantly absorb the energy of the lightning current and release it in the form of heat. Therefore, the arrester has a rapid temperature rise process. Therefore, the temperature can effectively reflect the state of the arrester.

[0004] At present, the status of lightning arresters is mainly evaluated by detecting the temperature of the outer surface of the lightning arrester under power on by infrared temperature measurement. This method does not measure the temperature of the internal heat source - the zinc oxide valve plate, and is greatly affected by the ambient light and temperature. Therefore, the recognition rate of fault status is not high.

[0005] After a built-in online monitoring type lightning arrester is available that can measure the arrester valve plate temperature for a long time and reliably, a new idea has been proposed for the state diagnosis of the lightning arrester based on the temperature. However, there are still problems to be solved in the process of the built-in monitoring type lightning arrester smoothly obtaining the arrester state, that is, the lightning arrester temperature sampling method needs to be innovated: since the built-in monitoring type lightning arrester obtains energy from the tiny leakage current of the lightning arrester, the energy extraction power is bound to be low, and a special energy-saving strategy must be adopted to ensure that the average load power of the temperature monitoring process is less than the energy extraction power; reasonable rules are also needed to diagnose the arrester state from the lightning arrester valve plate temperature data. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a temperature measurement and status diagnosis method based on a lightning arrester in response to the above-mentioned deficiencies in the prior art, so as to solve the problem that the energy consumption of the temperature measurement process of the built-in monitoring lightning arrester is higher than the energy extraction power, and there is no documented basis for diagnosing the valve plate temperature to the status.

[0007] The present invention adopts the following technical solutions:

[0008] A temperature measurement and status diagnosis method based on a lightning arrester, wherein a monitoring unit continuously draws power from a zinc oxide valve plate, measures data according to the action of the lightning arrester, and stores the measurement results as monitoring data. When the monitoring data meets the sending conditions, the monitoring unit sends the stored monitoring data to a remote monitoring terminal through a communication unit, clears the sent local data, and the monitoring unit enters the power-drawing state again; the remote monitoring terminal determines the state of the lightning arrester based on the received data.

[0009] Specifically, under steady-state conditions, if the monitoring data does not meet the sending conditions, when the arrester does not operate and the monitoring unit completes energy storage, the monitoring unit performs a data measurement and stores the collected data.

[0010] Furthermore, when the energy consumption of the monitoring unit exceeds a set value, the temperature measurement is stopped. The set value is 5% to 20% of the maximum storable energy of the energy storage device.

[0011] Specifically, if the monitoring data does not meet the sending conditions, when the arrester is actuated, data measurement with a frequency of 1 / 60 to 1 Hz is performed, and the collected data is stored, and then a sleep time is entered before returning to perform data measurement.

[0012] Furthermore, when the temperature of the arrester reaches a peak value after being actuated, the monitoring unit enters a power-taking state again.

[0013] Specifically, during the measurement process, when the total energy storage of the monitoring unit exceeds W3+W2+W1, a temperature measurement is performed under steady-state conditions, where W1 is the energy consumed by the monitoring unit in one measurement, W2 is the reserve energy consumed when the lightning arrester is activated, and W3 is the basic energy that the energy storage device reaches and can be used by the energy dissipation device.

[0014] Furthermore, under steady-state conditions, the temperature measurement period of the arrester is 5 to 60 minutes, and the measurement period after the arrester is actuated is 2 to 30 seconds.

[0015] Specifically, the sending conditions are: the number of monitoring data is 150 to 200, the time span of the monitoring data is 18 to 48 hours, and the number of multiple lightning strikes is 1 to 10.

[0016] Specifically, the monitoring data includes temperature data, time data and lightning strike action data.

[0017] Specifically, the communication unit is connected to the remote monitoring terminal by wireless communication.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The present invention provides a temperature measurement and state diagnosis method based on a lightning arrester. The monitoring data of a zinc oxide valve plate inside the lightning arrester is measured by a built-in monitoring unit according to a set energy-saving strategy, so as to achieve the purpose of reducing average monitoring energy consumption. After the monitoring data is sent to a remote monitoring terminal, the remote monitoring terminal diagnoses the state of the lightning arrester according to the received data. The remote monitoring terminal gives a normal state, a caution state, a dangerous state, and an alarm state according to the received data and a set warning value, thereby providing a reasonable basis for the state diagnosis of the built-in monitoring type lightning arrester.

[0020] Furthermore, the monitoring unit measures the surface temperature of the zinc oxide valve sheet adjacent to the built-in monitoring unit by intermittent measurement. The intermittently measured data is temporarily stored in the monitoring unit and sent to the remote receiving terminal after a certain amount of data is received. Intermittent temperature measurement greatly saves energy consumption for temperature measurement. Under steady-state conditions, it is a temperature measurement-power-off-temperature measurement mode with a long cycle, which is intended to measure long-term temperature changes.

[0021] Furthermore, when the energy consumption of the monitoring unit exceeds the set value, the temperature measurement is stopped, which is beneficial to retain a part of the available reserve energy W2 for the special situation that an overvoltage occurs during the steady-state temperature measurement process to cause the lightning arrester to operate and the temperature change after the operation needs to be monitored, so as not to consume all the available energy and cause a situation where no energy is available when the lightning arrester is operated.

[0022] Furthermore, the temperature measurement mode under the action condition of the lightning arrester is temperature measurement-sleep-temperature measurement...-shutdown-power-off mode. The temperature measurement cycle is short, which aims to obtain the initial temperature after action and the peak temperature estimated by the extreme value of the temperature scatter point, so as to further estimate the energy of the lightning strike and its impact on the life of the valve plate.

[0023] Furthermore, when it is determined that the temperature of the lightning arrester after operation has reached a peak value, the monitoring unit enters the power-on state again, which is beneficial to retain a portion of energy for measuring the temperature of the lightning arrester after the lightning arrester may operate again shortly thereafter, so that there will be no energy available for the temperature measurement process of the lightning arrester when it operates again.

[0024] Furthermore, when the total stored energy of the arrester exceeds W3+W2+W1, a temperature measurement is performed under steady-state conditions to ensure that the energy of the energy storage device does not exceed its maximum storable energy and thus cause safety problems.

[0025] Furthermore, the temperature measurement period of the arrester under steady-state conditions is set to be longer, at 5 to 60 minutes, and the measurement period after the arrester is actuated is set to be shorter, at 2 to 30 seconds. The purpose is to more evenly divide the energy consumption required for each state according to the demand for temperature data volume or density of the arrester state (steady state or action), so that more energy can be allocated to the arrester in the action state with high demand for temperature data density, thereby ensuring that the temperature measurement data is complete and valid.

[0026] Furthermore, the conditions for sending the locally stored temperature data to the recipient are: the number of monitoring data is 150 to 200, the time span of the monitoring data is 18 to 48 hours, and the number of multiple lightning strikes is 1 to 10 times. The purpose is to separate the temperature data acquisition and temperature data sending processes, and increase the interval time of the temperature sending process to reduce the energy consumption of the communication unit in sending data, and allocate this part of the saved energy to the temperature measurement process.

[0027] Furthermore, the monitoring data includes temperature data, time data and lightning action data. The combination of the three can determine the number of arrester actions, action time, temperature changes after action, and steady-state temperature changes, and further achieve effective evaluation of each lightning strike energy, arrester status, and arrester life.

[0028] Furthermore, the communication unit and the remote monitoring terminal are connected by wireless communication, which is the best way to obtain built-in temperature monitoring data, and is also conducive to reducing the cost of manual data acquisition and human inspection.

[0029] In summary, the present invention realizes low-power temperature measurement based on the low energy consumption of the built-in monitoring type lightning arrester, thereby ensuring the feasibility of the temperature measurement function of the built-in monitoring type lightning arrester; the method of diagnosing the arrester status from the arrester temperature data of the present invention makes up for the shortcomings of the built-in monitoring type lightning arrester.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the heat source distribution diagram of the built-in monitoring arrester;

[0032] Figure 2 is the equivalent circuit model of the lightning arrester;

[0033] Figure 3 This is a schematic diagram of the structure of a built-in monitoring arrester;

[0034] Figure 4 It is a schematic diagram of the energy acquisition and consumption process of the built-in monitoring unit;

[0035] Figure 5 This is the logic block diagram of the energy-saving temperature measurement method.

[0036] Among them: 1. Flange; 2. External insulating sleeve; 3. Internal gap; 4. Zinc oxide valve plate; 5. Monitoring unit. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0040] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects are in an "or" relationship.

[0041] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0042] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0043] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0044] The present invention provides a temperature measurement and status diagnosis method based on a lightning arrester. Based on a built-in monitoring lightning arrester, the temperature of a zinc oxide valve plate inside the lightning arrester is measured by a built-in monitoring unit according to a set energy-saving strategy, so as to achieve the purpose of reducing the average temperature measurement energy consumption, so as to cope with the limitation that the power consumption of the built-in monitoring lightning arrester is not high (the average power consumption is less than 0.03W); after the temperature data is sent to a remote monitoring terminal through wireless communication, the remote monitoring terminal determines the status of the lightning arrester according to the received data; after the present invention is applied, low-power temperature measurement is realized on the basis of the low power consumption of the built-in monitoring lightning arrester, thereby ensuring the reliable realization of the temperature measurement function of the built-in monitoring lightning arrester; the method for diagnosing the arrester status from the arrester temperature data provided by the present invention makes up for the omission of the built-in monitoring lightning arrester.

[0045] See also Figure 3 A monitoring unit 5 is provided inside the built-in monitoring arrester. The monitoring unit 5 is electrically connected to the zinc oxide valve plate 4 and draws energy from the leakage current of the zinc oxide valve plate 4. The leakage current is in the range of hundreds of microamperes to milliamperes, and the energy-drawing power is not high (the average energy-drawing power is less than 0.03W). Therefore, the temperature measurement process needs to take into account both sufficient temperature data and low average temperature measurement power.

[0046] See also Figure 5 The present invention provides a method for temperature measurement and state diagnosis based on a lightning arrester. The temperature of an internal zinc oxide valve plate 4 is measured by a built-in monitoring unit 5 according to a set energy-saving strategy to achieve the purpose of reducing average energy consumption; the data is then sent to a remote monitoring terminal by wireless communication, and the remote monitoring terminal diagnoses the state of the lightning arrester according to the received data;

[0047] The temperature measurement process of the monitoring unit is as follows:

[0048] S1, the monitoring unit 5 continuously draws power. If the monitoring data does not meet the sending conditions, when the arrester does not act (the arrester action is based on the action signal obtained by the built-in monitoring unit), and the energy storage is completed, a cycle of temperature measurement-energy extraction-temperature measurement is performed. The monitoring unit 5 performs a temperature measurement and stores the temperature measurement data. When the energy consumption of this process exceeds the set value W1, the temperature measurement is stopped. The set value W1 is less than 20% of the maximum energy storage device can store) to ensure that the energy extraction-consumption process cycle is short, so as to achieve that the temperature measurement frequency under steady-state conditions is not too low;

[0049] S2. If the monitoring data does not meet the sending conditions, when the arrester is activated, a temperature measurement cycle with a frequency of 1 / 60Hz to 1Hz is performed - temperature data storage - sleep - temperature measurement. When it is determined that the temperature measurement process has obtained the temperature peak after the arrester is activated, the temperature measurement is no longer performed, and the monitoring unit enters the power-on state again;

[0050] S3. When the monitoring data meets the sending conditions, the monitoring unit wirelessly sends the stored temperature data to the remote monitoring terminal through the communication unit, clears the sent local data, and enters the power-taking state again; after the temperature data is sent to the remote monitoring terminal via wireless communication, the remote monitoring terminal determines the state of the lightning arrester based on the received data.

[0051] The sending conditions include: the number of data has reached a certain amount, the time span since the last data was sent, and the data includes multiple lightning strikes.

[0052] It should be noted that the monitoring data includes not only temperature data, but also time data and lightning action data, that is, the temperature data also has time tags and lightning action tags.

[0053] See also Figure 4 , the energy intake and energy consumption of the temperature measurement process are as follows:

[0054] The energy consumed in a temperature measurement process under steady state is W1. The energy used under action conditions is at least the reserved energy W2, and at most the sum of the reserved energy W2 and the energy W1 stored for the steady-state temperature measurement process. The utilized energy depends on the energy that has been extracted and stored during the lightning strike.

[0055] During the energy extraction process, the total stored energy increases and develops to the right; the temperature measurement process consumes energy and develops to the left. When the total stored energy under steady state exceeds W3+W2+W1, a temperature measurement under steady state conditions is performed, consuming energy W1;

[0056] When the arrester is actuated, it consumes the reserve energy W2 and part of the energy prepared for steady-state temperature measurement, and W3 is the basic energy and is not consumed.

[0057] Based on the received data, the remote monitoring terminal gives the normal state, caution state, danger state and alarm state according to the data and the set warning value, providing a reasonable basis for the status diagnosis of the built-in monitoring lightning arrester.

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0059] Example 1

[0060] Temperature measurement and diagnosis method of 500kV built-in monitoring arrester

[0061] The 500kV built-in monitoring arrester is a whole composed of three built-in monitoring arrester sections connected in series; the outer insulation tube of the arrester is a porcelain insulation sleeve; the temperature measurement period under steady-state conditions is 5 minutes, and the temperature measurement period after lightning strike is 2 seconds; the condition for the communication unit to send data is that the number of measured temperature data reaches 200.

[0062] The method for determining the temperature peak after the arrester is actuated is:

[0063] Since the temperature sampling started after the arrester was actuated, the most recently obtained temperature T1 is less than the second to last obtained temperature T2. Under this condition, temperature sampling is performed again. If the temperature measured this time is less than T1, T2 is considered to be the temperature peak. If there are subsequent lightning strikes during this process, that is, the number of actions monitored by the built-in monitoring unit in this process increases, then the temperature peak after each action is the maximum temperature measured within the adjacent action time.

[0064] The temperature warning values ​​under steady-state conditions are:

[0065] Normal state: T<40℃, caution state: 40℃≤T<70℃;

[0066] Dangerous state: 70℃≤T<150℃, alarm state: 150℃≤T.

[0067] The temperature warning values ​​(for peak values) under operating conditions are:

[0068] Normal state: T<70℃, caution state: 70℃≤T<100℃;

[0069] Dangerous state: 100℃≤T<150℃, alarm state: 150℃≤T.

[0070] In this embodiment, the temperature measurement cycle, data transmission conditions, warning values, etc. are specified according to factors such as whether the lightning arrester has a gap, the number of lightning arrester nodes, the external insulation material, and the environment, making the temperature measurement method more targeted.

[0071] Example 2

[0072] Temperature measurement and diagnosis method of 35kV built-in monitoring series gap arrester

[0073] The main body of the 35kV built-in monitoring series gap arrester is a single-section zinc oxide arrester. The outer insulation tube of the arrester is a composite insulation sleeve. The temperature measurement period after the lightning strike is 30s. The condition for the communication unit to send data is that the time span of the measured temperature data exceeds 2 days.

[0074] The method for determining the temperature peak after the arrester is actuated is:

[0075] Since the arrester has been actuated and temperature sampling has begun, if the temperatures measured three times in a row are less than the fourth-to-last temperature T4, then T4 is considered to be the temperature peak. If there are subsequent lightning strikes during this process, that is, the number of actions detected by the built-in monitoring unit during this process increases, the temperature peak after each action is the maximum temperature measured during the adjacent action time.

[0076] The temperature warning values ​​(for peak values) under operating conditions are:

[0077] Normal state: T<75℃, caution state: 75℃≤T<100℃;

[0078] Dangerous state: 100℃≤T<155℃, alarm state: 155℃≤T.

[0079] In this embodiment, the energy-saving strategy and diagnosis basis of the arrester temperature measurement are different from those in the embodiment, which is conducive to making the temperature measurement process more flexible according to the changes of the arrester itself and external conditions. In this embodiment, the temperature measurement period after the action is larger to cope with the situation that the time for the valve plate temperature to rise to the peak value may be longer than expected under actual conditions.

[0080] Example 3

[0081] Temperature measurement and diagnosis method of 110kV internal monitoring gapless arrester

[0082] The main body of the 110kV built-in monitoring gapless lightning arrester is a single-section zinc oxide lightning arrester. The outer insulation tube of the lightning arrester is a composite insulating sleeve. The temperature measurement period under steady-state conditions is 20 minutes, and the temperature measurement period after lightning strike is 5 seconds. The condition for the communication unit to send data is that the time span of the measured temperature data exceeds 18 hours.

[0083] The method for determining the temperature peak after the arrester is actuated is:

[0084] Since the arrester has been actuated and temperature sampling has begun, if the temperatures measured three times in a row are less than the fourth-to-last temperature T4, then T4 is considered to be the temperature peak. If there are subsequent lightning strikes during this process, that is, the number of actions detected by the built-in monitoring unit during this process increases, the temperature peak after each action is the maximum temperature measured during the adjacent action time.

[0085] The temperature warning values ​​under steady-state conditions are:

[0086] Normal state: T<35℃, caution state: 35℃≤T<75℃;

[0087] Dangerous state: 75℃≤T<150℃, alarm state: 150℃≤T.

[0088] The temperature warning values ​​(for peak values) under operating conditions are:

[0089] Normal state: T<75℃, caution state: 75℃≤T<100℃;

[0090] Dangerous state: 100℃≤T<150℃, alarm state: 150℃≤T.

[0091] In this embodiment, the 10kV internal monitoring gapless arrester specifies various parameters of the temperature measurement method according to its own characteristics and the particularity of the application occasion, so that the temperature measurement method is more targeted to adapt to the parameter adjustment that may be required in different occasions.

[0092] Example 4

[0093] Temperature measurement and diagnosis method of 10kV internal monitoring gapless arrester

[0094] The main body of the 10kV built-in monitoring gapless lightning arrester is a single-section zinc oxide lightning arrester. The outer insulation tube of the lightning arrester is a composite insulating sleeve. The temperature measurement period under steady-state conditions is 10 minutes, and the temperature measurement period after lightning strike is 10 seconds. The condition for the communication unit to send data is that the measured temperature data reaches 200.

[0095] The method for determining the temperature peak after the arrester is actuated is:

[0096] Since the arrester started to operate and temperature sampling began, if the temperatures measured three times in a row are lower than the fourth-to-last temperature T4, T4 is considered to be the temperature peak. If there are subsequent lightning strikes during this process, that is, the number of operations detected by the built-in monitoring unit increases during this process, then the temperature peak after each operation is the maximum temperature measured during the adjacent operation time.

[0097] The temperature warning values ​​under steady-state conditions are:

[0098] Normal state: T<30℃, caution state: 30℃≤T<75℃;

[0099] Dangerous state: 75℃≤T<150℃, alarm state: 150℃≤T.

[0100] The temperature warning values ​​(for peak values) under operating conditions are:

[0101] Normal state: T<75℃, caution state: 75℃≤T<100℃;

[0102] Dangerous state: 100℃≤T<150℃, alarm state: 150℃≤T.

[0103] In this embodiment, the 10kV internal monitoring gapless arrester specifies various parameters of the temperature measurement method according to its own characteristics and the particularity of the application occasion, which obviously makes the temperature measurement method more targeted.

[0104] Example 5

[0105] Temperature measurement and diagnosis method of 220kV internal monitoring gapless arrester

[0106] The main body of the 220kV built-in monitoring gapless lightning arrester is a single-section zinc oxide lightning arrester. The outer insulation tube of the lightning arrester is a composite insulating sleeve. The temperature measurement period under steady-state conditions is 50 minutes, and the temperature measurement period after lightning strike is 15 seconds. The condition for the communication unit to send data is that the time span of the measured temperature data exceeds 1 day.

[0107] The method for determining the temperature peak after the arrester is actuated is:

[0108] Since the arrester started to operate and temperature sampling began, if the temperatures measured three times in a row are lower than the fourth-to-last temperature T4, T4 is considered to be the temperature peak. If there are subsequent lightning strikes during this process, that is, the number of operations detected by the built-in monitoring unit increases during this process, then the temperature peak after each operation is the maximum temperature measured during the adjacent operation time.

[0109] The temperature warning values ​​under steady-state conditions are:

[0110] Normal state: T<45℃, caution state: 45℃≤T<75℃;

[0111] Dangerous state: 75℃≤T<150℃, alarm state: 150℃≤T.

[0112] The temperature warning values ​​(for peak values) under operating conditions are:

[0113] Normal state: T<75℃, caution state: 75℃≤T<100℃;

[0114] Dangerous state: 100℃≤T<150℃, alarm state: 150℃≤T.

[0115] In this embodiment, the 220kV built-in monitoring type gapless lightning arrester clarifies the various parameters of the temperature measurement method according to its own characteristics and the particularity of the application scenario. Since the 220kV lightning arrester is the type with the highest voltage level among single-stage lightning arresters, the temperature judgment threshold under its normal state is fine-tuned to make the temperature measurement method more targeted.

[0116] Example 6

[0117] Temperature measurement and diagnosis method of 330kV internal monitoring gapless arrester

[0118] The main body of the 330kV built-in monitoring gapless lightning arrester is two sections of zinc oxide lightning arresters connected in series. The outer insulation tube of the lightning arrester is a porcelain insulation sleeve. The temperature measurement period under steady-state conditions is 30 minutes, and the temperature measurement period after lightning strike is 20 seconds. The condition for the communication unit to send data is that the time span of the measured temperature data exceeds 40 hours.

[0119] The method for determining the peak temperature after the arrester is actuated is as follows: since the temperature sampling started after the arrester was actuated, if the temperatures measured three times in a row are less than the fourth-to-last temperature T4, then T4 is considered to be the peak temperature. If there are subsequent lightning strikes during this process, that is, the number of actions detected by the built-in monitoring unit during this process increases, the peak temperature after each action is the maximum temperature measured during the adjacent action time.

[0120] The temperature warning values ​​under steady-state conditions are:

[0121] Normal state: T<35℃, caution state: 35℃≤T<75℃;

[0122] Dangerous state: 75℃≤T<150℃, alarm state: 150℃≤T.

[0123] The temperature warning values ​​(for peak values) under operating conditions are:

[0124] Normal state: T<75℃, caution state: 75℃≤T<100℃;

[0125] Dangerous state: 100℃≤T<150℃, alarm state: 150℃≤T.

[0126] In this embodiment, the 330kV built-in monitoring gapless arrester clarifies the various parameters of the temperature measurement method according to its own characteristics and the particularity of the application scenario, wherein the number of arrester sections is 2 in series, and corresponding fine-tuning is made to the various parameters to make the temperature measurement method more suitable for itself and the application scenario.

[0127] Example 7

[0128] Temperature measurement and diagnosis method of 1000kV internal monitoring gapless arrester

[0129] The main body of the 1000kV built-in monitoring gapless arrester is four zinc oxide arresters connected in series. The outer insulation tube of the arrester is a porcelain insulation sleeve. The temperature measurement period under steady-state conditions is 60 minutes, and the temperature measurement period after lightning strike is 3 seconds. The condition for the communication unit to send data is that the measured temperature data reaches 150.

[0130] The method for determining the temperature peak after the arrester is actuated is:

[0131] Since the arrester has been actuated and temperature sampling has begun, if the temperatures measured three times in a row are less than the fourth-to-last temperature T4, then T4 is considered to be the temperature peak. If there are subsequent lightning strikes during this process, that is, the number of actions detected by the built-in monitoring unit during this process increases, the temperature peak after each action is the maximum temperature measured during the adjacent action time.

[0132] The temperature warning values ​​under steady-state conditions are:

[0133] Normal state: T<40℃, caution state: 40℃≤T<75℃;

[0134] Dangerous state: 75℃≤T<150℃, alarm state: 150℃≤T.

[0135] The temperature warning values ​​(for peak values) under operating conditions are:

[0136] Normal state: T<75℃, caution state: 75℃≤T<100℃;

[0137] Dangerous state: 100℃≤T<150℃, alarm state: 150℃≤T.

[0138] In this embodiment, the 1000kV built-in monitoring gapless arrester clarifies the various parameters of the temperature measurement method according to its own characteristics and the particularity of the application scenario. Among them, the number of sections of the 1000kV arrester is increased to four, and the various parameters are changed accordingly to make the temperature measurement method more individually targeted.

[0139] Example 8

[0140] Temperature measurement and diagnosis method of 1000kV internal monitoring gapless arrester

[0141] The main body of the 1000kV built-in monitoring gapless lightning arrester is four zinc oxide lightning arresters connected in series. The outer insulation tube of the lightning arrester is a porcelain insulation sleeve. The temperature measurement period under steady-state conditions is 45 minutes, and the temperature measurement period after lightning strike is 3 seconds. The condition for the communication unit to send data is that the lightning arrester has been actuated twice.

[0142] The method for determining the temperature peak after the arrester is actuated is:

[0143] Since the arrester has been actuated and temperature sampling has begun, if the temperatures measured three times in a row are less than the fourth-to-last temperature T4, then T4 is considered to be the temperature peak. If there are subsequent lightning strikes during this process, that is, the number of actions detected by the built-in monitoring unit during this process increases, the temperature peak after each action is the maximum temperature measured during the adjacent action time.

[0144] The temperature warning values ​​under steady-state conditions are:

[0145] Normal state: T<45℃, caution state: 45℃≤T<75℃;

[0146] Dangerous state: 75℃≤T<150℃, alarm state: 150℃≤T.

[0147] The temperature warning values ​​(for peak values) under operating conditions are:

[0148] Normal state: T<75℃, caution state: 75℃≤T<100℃;

[0149] Dangerous state: 100℃≤T<150℃, alarm state: 150℃≤T.

[0150] In this embodiment, the 1000kV built-in monitoring gapless arrester clarifies the various parameters of the temperature measurement method according to its own characteristics and the particularity of the application scenario. The most obvious difference is that the number of arrester operations is used as the judgment condition for data transmission, making the temperature measurement method more region-specific.

[0151] In summary, the temperature measurement and status diagnosis method based on the lightning arrester of the present invention realizes low-power temperature measurement on the basis of low energy consumption of the built-in monitoring lightning arrester, thereby ensuring the feasibility of the temperature measurement function of the built-in monitoring lightning arrester; the diagnostic method of the present invention makes up for the shortcomings of the built-in monitoring lightning arrester.

[0152] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A temperature measurement and status diagnosis method based on a lightning arrester, characterized in that: Based on the built-in monitoring type arrester, the temperature of the zinc oxide valve plate inside the arrester is measured by the built-in monitoring unit according to the set energy-saving strategy, including the following steps: S1, the monitoring unit continuously draws power. If the monitoring data does not meet the sending conditions, when the arrester does not act and the energy storage is completed, a cycle of temperature measurement-energy extraction-temperature measurement is performed. The monitoring unit performs a temperature measurement and stores the temperature measurement data. When the energy consumption of this process exceeds the set value W1, the temperature measurement is stopped to ensure that the cycle period of the energy extraction-consumption process is short, so as to achieve that the temperature measurement frequency under steady-state conditions is not too low; The monitoring data includes temperature data, time data and lightning action data; the temperature data also has a time tag and a lightning action tag; The sending conditions include the number of data, the time span since the last data was sent, and the number of lightning strikes; S2. If the monitoring data does not meet the sending conditions, when the arrester is actuated, a temperature measurement cycle with a frequency of 1 / 60 Hz to 1 Hz is performed - temperature data storage - sleep - temperature measurement. When it is determined that the temperature measurement process has obtained the temperature peak after the arrester is actuated, the temperature measurement is no longer performed, and the monitoring unit enters the power-on state again; S3. When the monitoring data meets the sending conditions, the monitoring unit wirelessly sends the stored temperature data to the remote monitoring terminal through the communication unit, clears the sent local data, and enters the power-taking state again; after the temperature data is sent to the remote monitoring terminal via wireless communication, the remote monitoring terminal determines the state of the lightning arrester based on the received data.

2. The temperature measurement and status diagnosis method based on the arrester according to claim 1 is characterized in that: The set value W1 is 5% to 20% of the maximum storable energy of the energy storage device.

3. The temperature measurement and status diagnosis method based on the arrester according to claim 2 is characterized in that: Under steady-state conditions, the temperature measurement period of the arrester is 5 to 60 minutes, and the measurement period after the arrester is actuated is 2 to 30 seconds.

4. The temperature measurement and status diagnosis method based on a lightning arrester according to any one of claims 1 to 3, characterized in that: The sending conditions are: the number of monitoring data is 150 to 200, the time span of monitoring data is 18 to 48 hours, and the number of multiple lightning strikes is 1 to 10.

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