Real-time temperature measuring device for capacitor bank and capacitor cabinet comprising same

Abstract

The utility model provides a real-time temperature measuring device for a capacitor bank and a capacitor cabinet comprising the same. And the capacitor bank consists of a plurality of capacitors and is arranged in the capacitor cabinet. The device comprises a plurality of temperature sensors, an antenna and a temperature collector. And the plurality of temperature sensors are respectively arranged at a wiring terminal of the capacitor bank, a busbar connection point of the capacitor bank, a shell of the capacitor and the inside of the capacitor cabinet. The antenna is arranged in the capacitor cabinet and is in wireless communication with the temperature sensor. And the temperature collector is arranged outside the capacitor cabinet and is connected with the antenna. According to the utility model, the temperature sensor is utilized to carry out real-time wireless temperature measurement on the capacitor bank, so that the temperature measurement efficiency is improved, and the workload of personnel is reduced. According to the utility model, the temperature sensor is arranged at the key position of the capacitor bank, so that the temperature of the capacitor bank can be measured more accurately, and the judgment on the working and running state of the capacitor bank is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic components, and in particular relates to a real-time temperature measuring device for a capacitor bank and a capacitor cabinet comprising the same. Background Art

[0002] The statements in this section are only intended to provide background information related to the present invention to help understand the present invention. Such background information does not necessarily constitute prior art.

[0003] The capacitor bank is a working group composed of multiple capacitors. The capacitor bank has the characteristics of large capacity, large number of units, and high voltage level. The use of parallel capacitor banks can compensate for the reactive power of the line, and the series capacitor bank compensation technology is one of the effective means to improve the stability limit and economy of the transmission and transformation network. The capacitor bank can also play a filtering function in the power system and is an irreplaceable important component. With the increase of power load, especially the occurrence of large current, this will cause the internal temperature of the capacitor to rise sharply, causing the capacitor bank to fail. Once the capacitor bank fails, it will cause significant losses. The temperature of the capacitor bank is one of the important factors that reflect whether the capacitor bank is working normally. By online monitoring the temperature of the key components of the capacitor bank, the degree of degradation and operating status of the key parts can be reliably grasped, the potential safety hazards can be eliminated, and the power outage time for users can be reduced.

[0004] Traditional capacitor banks are placed in medium voltage cabinets (called capacitor cabinets). When the product is operating normally, the cabinet door is not allowed to be opened, so usually the inspection personnel can only use infrared thermometers to measure the temperature through the observation window of the capacitor cabinet. Because the hot spots cannot be touched and the signal reception is unstable, the temperature measurement results are less accurate and require frequent operations, which increases the workload of the inspection personnel. Utility Model Content

[0005] According to one aspect of the utility model, a real-time temperature measurement device for a capacitor bank is provided, wherein the capacitor bank is composed of a plurality of capacitors and is placed in a capacitor cabinet. The device comprises: a plurality of temperature sensors 101, which are respectively arranged at the connection terminals of the capacitor bank, the busbar connection points of the capacitor bank, the outer shell of at least one of the plurality of capacitors and the inside of the capacitor cabinet, and are used to measure the temperature at the corresponding position and send the temperature measurement result according to the received temperature measurement instruction; an antenna 102 arranged inside the capacitor cabinet, which is wirelessly connected to the temperature sensor 101, and is used to send a temperature measurement instruction to the temperature sensor 101, and receive the temperature measurement result returned by the temperature sensor 101; and a temperature collector 103 arranged outside the capacitor cabinet, which is connected to the antenna 102, and is used to control the antenna 102 to send a temperature measurement instruction to activate the temperature sensor 101, and use the antenna 102 to receive the temperature measurement result; wherein the temperature sensor 101 is a passive temperature sensor, which is arranged to receive the energy of the temperature measurement instruction to work.

[0006] Preferably, the temperature collector 103 is connected to the antenna 102 for communication via a radio frequency line.

[0007] Preferably, the temperature sensor 101 includes an integrated circuit chip and a signal transceiver, and the integrated circuit chip includes a temperature measurement circuit.

[0008] Preferably, the temperature sensor 101 is an RFID temperature sensor.

[0009] Preferably, the antenna 102 communicates with the temperature sensor 101 via the ISO 18000-6C air interface protocol.

[0010] Preferably, the antenna 102 is a radio frequency gain antenna.

[0011] Preferably, the temperature sensor 101 is arranged at the connection terminal of the capacitor group, the busbar connection point of the capacitor group, and the housing of at least one of the plurality of capacitors in one of the following ways: patch type fixing, clamp type fixing, and threaded type fixing.

[0012] Preferably, the device further comprises: a server 104 connected to the temperature collector 101, for collecting temperature information measured by the temperature sensor 101, and monitoring the temperature of the capacitor bank according to the temperature information.

[0013] Preferably, the device further comprises: a temperature and humidity control system 105 disposed inside the capacitor cabinet, which is connected to the server 104 and is used to cool down the capacitor bank according to the monitoring results.

[0014] According to another aspect of the utility model, a capacitor cabinet is provided, comprising any of the above-mentioned real-time temperature measurement devices.

[0015] Compared with the prior art, the utility model uses a passive temperature sensor to measure the temperature of the capacitor bank in real time wirelessly, so that the situation where the inspection personnel can only use the infrared thermometer to measure the temperature through the observation window will no longer occur, thereby improving the temperature measurement efficiency and reducing the workload of the personnel. At the same time, by setting the temperature sensor at the key position of the capacitor bank, a more accurate temperature measurement of the capacitor bank can be achieved, which is conducive to the judgment of the working status of the capacitor bank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings, wherein:

[0017] Figure 1 It is a first structural schematic diagram of a real-time temperature measurement device according to an embodiment of the utility model.

[0018] Figure 2 It is a second structural schematic diagram of the real-time temperature measurement device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] like Figure 1As shown, in one embodiment of the utility model, a real-time temperature measurement device for a capacitor group is provided, wherein the capacitor group is composed of a plurality of capacitors and is placed in a capacitor cabinet. The temperature measurement device comprises: a plurality of temperature sensors 101, an antenna 102 arranged inside the capacitor cabinet, and a temperature collector 103 arranged outside the capacitor cabinet. Among them, the plurality of temperature sensors 101 are used to measure the temperature of the setting position and send the temperature measurement result according to the received temperature measurement instruction. After research, the inventor sets the plurality of temperature sensors 101 at the position where the capacitor group is prone to failure. Because the connection position such as the connection terminal of the capacitor group and the busbar connection point of the capacitor group is prone to virtual connection or poor contact, this situation will cause the internal resistance of the capacitor to increase, resulting in excessive heat generation of the capacitor group, causing the capacitor group to fail. Therefore, the inventor sets temperature sensors 101 at the connection terminal of the capacitor group and the busbar connection point of the capacitor group respectively. A temperature sensor 101 is also provided on the shell of at least one of the multiple capacitors. This is because after a fault occurs inside the capacitor, the internal resistance of the capacitor will also increase, causing the heat generated by the capacitor to increase sharply. Therefore, the temperature sensor 101 is provided on the capacitor shell to timely detect the fault inside the capacitor. In addition, a temperature sensor 101 is also provided in a corner inside the capacitor cabinet or outside the capacitor cabinet near the cabinet body to measure the ambient temperature when the capacitor bank is working. The working state of the capacitor bank is closely related to the temperature of these key positions, thereby providing accurate temperature measurement, and then providing an accurate judgment of the working state of the capacitor bank. The antenna 102 is used to send a temperature measurement instruction to the temperature sensor 101 and receive the temperature measurement result returned by the temperature sensor 101. The antenna 102 and the temperature sensor 101 can be connected by wired communication through the RS-485 bus with the Modbus TCP protocol. However, since the temperature sensors 101 have been provided at multiple positions of the capacitor bank, the antenna 102 needs to be connected to the temperature sensors 101 at multiple positions, and the connection line will be more complicated. In order to avoid too many lines and difficult wiring, in one embodiment of the utility model, the antenna 102 and the temperature sensor 101 are preferably connected by wireless communication. The temperature collector 103 is used to control the antenna 102 to send a temperature measurement instruction to activate the temperature sensor 101, and use the antenna 102 to receive the temperature measurement result. The temperature collector 103 and the antenna 102 can be connected wirelessly, but considering that the capacitor cabinet is full of electrical equipment, interference signals will be generated during operation. In order to avoid interference, in one embodiment of the utility model, the temperature collector 103 and the antenna 102 are preferably connected by wire to make the transmission more stable; and the temperature collector 103 and the antenna 102 are single-point to single-point connections, and the wired connection line is simple and the wiring is also convenient. The temperature collector 103 can accept local or remote control instructions to control the sending of temperature measurement instructions.

[0021] From the perspective of different energy sources, temperature sensors can be divided into active temperature sensors and passive temperature sensors. Although active temperature sensors can provide larger output current and voltage, making signal transmission more stable and reliable, they are highly dependent on external energy sources and require energy supply devices such as batteries or external power supplies when working, so they are often large in size. In one embodiment of the utility model, it is necessary to set temperature sensors at multiple points of the capacitor bank, use a large number of sensors, and have low power consumption requirements, so it is preferred to use passive temperature sensors with low power consumption and small size, which work using the energy carried in the received temperature measurement instruction. Specifically, the temperature sensor 101 may include an integrated circuit chip and a signal transceiver. The integrated circuit chip includes a temperature measurement circuit and stores the ID of the location where the temperature sensor 101 is set. After receiving the temperature measurement instruction, the signal transceiver uses the electromagnetic waves in the temperature measurement instruction to activate the temperature measurement circuit and provide working energy for the temperature measurement circuit.

[0022] In one embodiment of the utility model, the temperature sensor 101 is a radio frequency identification (RFID) temperature sensor. The RFID temperature sensor uses a passive wireless transmission technology based on RFID and integrates an ultra-low power consumption temperature measurement circuit in an integrated circuit chip to monitor the contact point temperature. It can directly contact the temperature measurement point, has a large temperature measurement range, high accuracy, and high temperature resistance; it is a passive device and has the advantages of safe use, maintenance-free, and strong anti-interference.

[0023] In one embodiment of the present invention, the antenna 102 may be a radio frequency gain antenna, which can improve the strength of the transmission signal and avoid signal interference in a working environment with many electrical devices, making the transmission process more stable.

[0024] In one embodiment of the utility model, the antenna 102 and the temperature sensor 101 can communicate using the ISO18000-6C air interface protocol. For wireless radio frequency, typical operating frequencies are: 125KHZ, 13.56MHz, 869.5MHz, 915.3MHZ, 2.45GHz, etc. The ISO 18000-6C standard protocol stipulates the requirements of the radio frequency identification system operating in the ultra-high frequency (i.e., 860-960MHZ) range. ISO 18000-6C is a typical short frame communication method, which shortens the air data frame of the passive device so that the communication can be completed efficiently at the moment when the radio energy transfer conditions between the passive device and the reading device antenna are formed. It has a high reading speed, and the data rate can reach 40kbps to 640kbps; a large number of tags can be read at the same time, and theoretically more than 1,000 tags can be read; it has multiple encryption methods and strong security. Compared with other wireless communication technologies, the equipment and communication protocol of RFID technology using ISO 18000-6C air interface protocol can be more resistant to interference in the complex working environment of capacitor banks, can achieve good communication, ensure the stability and accuracy of data transmission, can read data in batches, and improve the efficiency of data processing.

[0025] In one embodiment of the utility model, the temperature sensor 101 is arranged at the terminal of the capacitor group, the busbar connection point of the capacitor group, and the casing of the capacitor in one of the following ways: patch type fixing, clamp type fixing, and threaded fixing. In the patch type fixing method, the temperature sensor 101 is constructed as a thin sheet and fixed to the corresponding position by a thermally conductive adhesive. In the clamp type fixing, a hole that can be passed by the clamp is provided on the temperature sensor 101, and the clamp passes through the hole to connect with the temperature sensor 101, and the temperature sensor is fixed to the temperature measurement position by the clamp. In the threaded fixing, a fixing plate is provided at the temperature measurement position, and an internal threaded hole is opened on the fixing plate. A bolt is provided on the temperature sensor 4, and the temperature sensor is fixed to the temperature measurement position by the bolt and the internal threaded hole.

[0026] like Figure 2 As shown, in one embodiment of the utility model, the temperature measuring device further includes a server 104, which is connected to the temperature collector 103 and is used to collect the temperature information measured by the temperature sensor 101, and monitor the temperature of the capacitor bank according to the temperature information. The server 104 can determine whether the heat generation of the temperature measurement position of the capacitor bank is too high so as to lock the fault position. In some embodiments, the server 104 can send a control instruction to the temperature collector 103 to control the sending of the temperature measurement instruction.

[0027] In one embodiment of the present invention, the server 104 monitors the temperature of the capacitor bank, and determines that the temperature of the capacitor bank is normal if all of the following conditions are met:

[0028] Condition 1: The temperature rise of the terminal block over the ambient temperature is within a first temperature rise range; based on multiple tests and empirical judgments by the inventor, the first temperature rise range of the embodiment of the utility model is preferably 0 to 50 degrees Celsius.

[0029] Condition 2: The temperature rise of the busbar connection point above the ambient temperature is within the second temperature rise range; based on multiple tests and empirical judgment by the inventor, the second temperature rise range of the embodiment of the utility model is preferably 0 to 50 degrees Celsius.

[0030] Condition 3: The temperature rise of the capacitor housing over the ambient temperature is within the third temperature rise range; based on multiple tests and empirical judgment by the inventor, the third temperature rise range of the embodiment of the utility model is preferably 0 to 30 degrees Celsius.

[0031] Condition 4: The temperature difference at the same target position among the three phases of the capacitor bank is within the fourth temperature difference range. According to multiple tests and experience of the inventor, the fourth temperature rise range of the embodiment of the utility model is preferably 0 to 20 degrees Celsius.

[0032] If any one of conditions 1 to 4 is not satisfied, it is determined that the temperature of the capacitor cabinet is abnormal.

[0033] like Figure 2 As shown, in one embodiment of the utility model, the temperature measuring device also includes a temperature and humidity control system 105, which is arranged inside the capacitor cabinet and connected to the server 104, and is used to cool the capacitor bank according to the monitoring results. The temperature and humidity control system 105 can eliminate the fault in time according to the monitoring results to avoid major accidents such as fire or tripping of the upper system caused by the expansion of the fault.

[0034] In one embodiment of the present invention, if the server 104 determines that the temperature of the capacitor cabinet is abnormal, the server 104 starts the temperature and humidity control system 105 built into the capacitor cabinet to cool down the capacitor bank in the capacitor cabinet.

[0035] In one embodiment of the present invention, if the server 104 determines that the temperature of the capacitor cabinet is abnormal, it issues an alarm to notify the inspection personnel.

[0036] like Figure 2As shown, in one embodiment of the present invention, a display module 106 is further included, which is connected to the server 104 and is used to display the temperature measurement results and monitoring results. The display module 106 is implemented in at least one of the following ways: a computer program, a SCADA cloud platform (Supervisory Control And Data Acquisition), and a mobile application.

[0037] Based on the same inventive concept, an embodiment of the present utility model provides a capacitor cabinet, comprising the real-time temperature measurement device as described in the above embodiments.

[0038] The utility model adopts wireless radio frequency identification technology to realize real-time wireless temperature measurement of capacitor banks, which can replace the work procedure of patrol personnel who can only use infrared thermometers to perform infrared temperature measurement through the observation window of the capacitor cabinet, thereby improving the temperature measurement efficiency and reducing the workload of personnel. At the same time, real-time monitoring can be carried out, and the degree of degradation and operating status of the capacitor bank can be reliably grasped, potential accidents can be eliminated, and the power outage time for users can be reduced. At the same time, by setting the temperature sensor at the key position of the capacitor bank, more accurate temperature measurement of the capacitor bank can be achieved, which is conducive to the judgment of the working status of the capacitor bank.

[0039] References in this specification to "various embodiments," "some embodiments," "one embodiment," or "an embodiment," etc. refer to a particular feature, structure, or property described in conjunction with the embodiment being included in at least one embodiment. Thus, the appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," etc., in various places throughout the specification do not necessarily refer to the same embodiment. Furthermore, particular features, structures, or properties may be combined in any suitable manner in one or more embodiments. Thus, particular features, structures, or properties shown or described in conjunction with one embodiment may be combined in whole or in part with features, structures, or properties of one or more other embodiments without restriction, as long as the combination is not illogical or inoperable.

[0040] The expressions of "including", "having" and similar meanings in this specification are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices. "One" or "an" does not exclude multiple situations. In addition, the elements in the drawings of the utility model are only for illustrative purposes and are not drawn to scale.

[0041] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein, but also includes various changes and modifications without departing from the scope of the present invention.

[0042] Description of Reference Numerals

[0043] 101: temperature sensor;

[0044] 102: Antenna;

[0045] 103: temperature collector;

[0046] 104: server;

[0047] 105: Temperature and humidity control system;

[0048] 106: Display module.

Claims

1. A real-time temperature measurement device for a capacitor bank, wherein the capacitor bank is composed of a plurality of capacitors and is placed in a capacitor cabinet, characterized in that: include: A plurality of temperature sensors (101), respectively arranged at the connection terminals of the capacitor group, the busbar connection points of the capacitor group, the outer shell of at least one of the plurality of capacitors and the inside of the capacitor cabinet, for measuring the temperature at the corresponding position and sending the temperature measurement result according to the received temperature measurement instruction; An antenna (102) disposed inside the capacitor cabinet, which is wirelessly connected to the temperature sensor (101) and is used to send a temperature measurement instruction to the temperature sensor (101) and receive a temperature measurement result returned by the temperature sensor (101); and A temperature collector (103) disposed outside the capacitor cabinet, connected to the antenna (102), used to control the antenna (102) to issue a temperature measurement instruction to activate the temperature sensor (101), and to receive the temperature measurement result using the antenna (102); The temperature sensor (101) is a passive temperature sensor, which is configured to receive energy from the temperature measurement instruction to operate.

2. The device according to claim 1, characterized in that: The temperature collector (103) is communicatively connected to the antenna (102) via a radio frequency line.

3. The device according to claim 1, characterized in that: The temperature sensor (101) comprises an integrated circuit chip and a signal transceiver, and the integrated circuit chip comprises a temperature measurement circuit.

4. The device according to claim 1, characterized in that: The temperature sensor (101) is an RFID temperature sensor.

5. The device according to claim 4, characterized in that: The antenna (102) communicates with the temperature sensor (101) via the ISO 18000-6C air interface protocol.

6. The device according to claim 4, characterized in that: The antenna (102) is a radio frequency gain antenna.

7. The device according to claim 1, characterized in that: The temperature sensor (101) is arranged on a connection terminal of a capacitor group, a busbar connection point of the capacitor group, and a housing of at least one of the plurality of capacitors in one of the following ways: patch-type fixing, clamp-type fixing, and thread-type fixing.

8. The device according to claim 1, characterized in that: Also includes: The server (104) connected to the temperature collector (103) is used to collect the temperature information measured by the temperature sensor (101) and monitor the temperature of the capacitor bank based on the temperature information.

9. The device according to claim 8, characterized in that: Also includes: A temperature and humidity control system (105) is arranged inside the capacitor cabinet and is connected to the server (104) and is used to cool the capacitor bank according to monitoring results.

10. A capacitor cabinet, comprising the real-time temperature measurement device according to any one of claims 1 to 9.

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