Insulation state fusion online monitoring device applied to medium-voltage switch cabinet

Abstract

An insulation state fusion online monitoring device applied to a medium-voltage switch cabinet comprises a power supply unit, an alarm module, a host module and an external sensor module. The power supply unit is used for supplying power to the host module and the external sensor module; the host module comprises a first processor chip, a wireless communication unit, a first TVOC sensor and a first PM2.5 sensor, wherein the wireless communication unit, the first TVOC sensor and the first PM2.5 sensor are connected with the first processor chip. The external sensor module comprises a second processor chip, a second TVOC sensor and a second PM2.5 sensor, wherein the second TVOC sensor and the second PM2.5 sensor are connected with the second processor chip. According to the device, the TVOC and the PM2.5 are matched with the insulation state of the medium-voltage switch cabinet through a test, so that the damage state of an insulation part in the switch cabinet is accurately judged, operation and maintenance can be guided according to an insulation state evaluation result, the operation and maintenance efficiency of the switch cabinet is improved, accurate operation and intelligent operation and maintenance are achieved, and the operation reliability and safety of the switch cabinet are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power monitoring in the power industry, in particular to an insulation state fusion online monitoring device applied to a medium-voltage switch cabinet. Background Art

[0002] The current methods used to monitor insulation faults in medium-voltage switchgear primarily rely on electrical quantity monitoring. This involves monitoring the acoustic, optical, electromagnetic, current, voltage, and temperature changes caused by partial discharge when an insulation fault occurs, indirectly predicting whether an insulation fault has occurred. Key monitoring methods include temperature measurement, pulse current, ultra-high frequency (UHF), transient ground voltage, ultrasonic testing, and optical detection.

[0003] Although the above methods can monitor the occurrence of partial discharge to a certain extent, the occurrence of partial discharge does not necessarily mean that the insulation will be damaged in the short term. Existing medium-voltage switchgear is monitored by the above monitoring methods. When partial discharge is detected, the severity of the insulation damage to the insulation material inside the switchgear cannot be accurately assessed. In some cases, it will increase the ineffective operation and maintenance workload. In fact, the old medium-voltage switchgear in operation basically has more or less insulation damage, but it can still operate safely for many years. In this case, conventional electrical quantity monitoring methods cannot directly reflect the true insulation state of the insulation material inside the switchgear, which often brings trouble to the operation and maintenance personnel in judging the insulation state of the medium-voltage switchgear. Therefore, it is necessary to develop an online monitoring device that can directly reflect the insulation state of the medium-voltage switchgear. Utility Model Content

[0004] The utility model solves the deficiencies of the prior art and provides an insulation status fusion online monitoring device for medium-voltage switchgear, which can accurately evaluate the insulation status of the insulation material inside the switchgear by simultaneously performing online monitoring of TVOC and PM2.5 in the switchgear.

[0005] To achieve the above-mentioned object, the present invention first proposes an insulation status fusion online monitoring device for medium-voltage switchgear, comprising a power supply unit, an alarm module, a host module, and an external sensor module; the power supply unit is used to supply power to the host module and the external sensor module;

[0006] The host module includes a first processor chip and a wireless communication unit, a first TVOC sensor, and a first PM2.5 sensor, all of which are connected to the first processor chip; the first TVOC sensor is used to monitor the TVOC in the medium-voltage switchgear in real time as a first TVOC value, and the first PM2.5 sensor is used to monitor the PM2.5 in the medium-voltage switchgear in real time as a first PM2.5 value;

[0007] The external sensor module includes a second processor chip, and a second TVOC sensor and a second PM2.5 sensor both connected to the second processor chip; the second TVOC sensor is used to monitor the TVOC of the external environment of the medium-voltage switchgear in real time as a second TVOC value, and the second PM2.5 sensor is used to monitor the PM2.5 of the external environment of the medium-voltage switchgear in real time as a second PM2.5 value;

[0008] The first processor chip is connected to the second processor chip through the communication module, and the wireless communication unit wirelessly uploads the first TVOC value and the first PM2.5 value monitored by the first processor chip and the second TVOC value and the second PM2.5 value monitored by the second processor chip to a designated server;

[0009] The server and the alarm module are installed in a remote control room, the alarm module is connected to the server, the server is used to save the first TVOC value, the first PM2.5 value, the second TVOC value and the second PM2.5 value, and the processor in the server compares the difference between the first TVOC value and the second TVOC value with the set TVOC standard deviation value, and compares the difference between the first PM2.5 value and the second PM2.5 value with the set PM2.5 standard deviation value;

[0010] The alarm module is used to issue a TVOC exceeding standard warning when the difference between the first TVOC value and the second TVOC value exceeds the TVOC standard deviation value, and to issue a PM2.5 exceeding standard warning when the difference between the first PM2.5 value and the second PM2.5 value exceeds the PM2.5 standard deviation value.

[0011] In this embodiment, the host module is installed in the medium voltage switch cabinet, and the external sensor module is installed outside the medium voltage switch cabinet.

[0012] In this embodiment, the wireless communication unit includes a wireless communication chip, an Internet of Things card slot and an external antenna interface. The external antenna interface is connected to the wireless communication chip, the wireless communication chip is connected to the first processor chip, and the Internet of Things card slot is connected to the first processor chip.

[0013] In this embodiment, the host module further includes a first temperature sensor and a first humidity sensor, and both the first temperature sensor and the first humidity sensor are connected to the first processor chip.

[0014] In this embodiment, the external sensor module further includes a second temperature sensor and a second humidity sensor, and the second temperature sensor and the second humidity sensor are both connected to the second processor chip.

[0015] In this embodiment, the communication module comprises a first 485 chip, a first 485 interface, a second 485 chip and a second 485 interface, the first processor chip, the first 485 chip and the first 485 interface are sequentially connected, the second processor chip, the second 485 chip and the second 485 interface are sequentially connected, and the first 485 interface and the second 485 interface are connected by wire.

[0016] In this embodiment, the power supply unit comprises a battery pack, a power management chip and a power adapter interface, the battery pack and the power adapter interface are connected with the power management chip, and the power management chip is connected with the first processor chip.

[0017] In this embodiment, the first processor chip is further connected with a display, an SD card slot, a buzzer and a key.

[0018] In summary, the device can accurately judge the damage state of the internal insulation parts of the switch cabinet by matching TVOC, PM2.5 and the insulation state of the medium-voltage switch cabinet through experiments, and can guide operation and maintenance according to the insulation state evaluation result, improve the efficiency of switch cabinet operation and maintenance, achieve precise operation and maintenance intelligent operation and maintenance, and improve the reliability and safety of switch cabinet operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a structural schematic diagram of a host module of the utility model;

[0020] Figure 2 Fig. 2 is a structural schematic diagram of an external sensor module of the utility model.

[0021] In the drawings: 1, host module; 11, first processor chip; 12, first TVOC sensor; 13, first PM2.5 sensor; 14, wireless communication unit; 141, external antenna interface; 142, wireless communication chip; 143, Internet of Things card slot; 15, power supply unit; 151, battery pack; 152, power management chip; 153, power adapter interface; 161, first 485 chip; 162, first 485 interface; 17, first temperature sensor; 18, first humidity sensor; 191, buzzer; 192, key; 193, display; 194, SD card slot; 2, external sensor module; 21, second processor chip; 22, second TVOC sensor; 23, second PM2.5 sensor; 24, second temperature sensor; 25, second humidity sensor; 261, second 485 chip; 262, second 485 interface. DETAILED DESCRIPTION

[0022] 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 embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0023] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0024] like Figure 1 、 2 As shown, a fusion online monitoring device for insulation status of a medium-voltage switchgear includes a power supply unit 15, an alarm module, a host module 1, and an external sensor module 2. The power supply unit 15 is used to supply power to the host module 1 and the external sensor module 2. The host module is installed in the medium-voltage switchgear, and the external sensor module is installed outside the medium-voltage switchgear.

[0025] The host module 1 includes a first processor chip 11 and a wireless communication unit 14, a first TVOC sensor 12, a first PM2.5 sensor 13, a first temperature sensor 17, a first humidity sensor 18, a display 193, an SD card slot 194, a buzzer 191, and a button 192, all of which are connected to the first processor chip 11. The first TVOC sensor 12 is used to monitor the TVOC in the medium-voltage switchgear in real time as a first TVOC value. The first PM2.5 sensor 13 is used to monitor the PM2.5 in the medium-voltage switchgear in real time as a first PM2.5 value. The first temperature sensor 17 and the first humidity sensor 18 are used to monitor the temperature and humidity in the switchgear.

[0026] The external sensor module includes a second processor chip 21 and a second TVOC sensor 22, a second PM2.5 sensor 23, a second temperature sensor 24, and a second humidity sensor 25, all of which are connected to the second processor chip 21; the second TVOC sensor 22 is used to monitor the TVOC in the external environment of the medium-voltage switchgear in real time as a second TVOC value, the second PM2.5 sensor 23 is used to monitor the PM2.5 in the external environment of the medium-voltage switchgear in real time as a second PM2.5 value, and the second temperature sensor 24 and the second humidity sensor 25 are used to monitor the temperature and humidity outside the switchgear;

[0027] The first processor chip 11 is connected to the second processor chip 21 through a communication module, and the wireless communication unit 14 wirelessly uploads the first TVOC value and the first PM2.5 value monitored by the first processor chip 11 and the second TVOC value and the second PM2.5 value monitored by the second processor chip 21 to a designated server;

[0028] The server and the alarm module are installed in a remote control room, the alarm module is connected to the server, the server is used to save the first TVOC value, the first PM2.5 value, the second TVOC value and the second PM2.5 value, and the processor in the server compares the difference between the first TVOC value and the second TVOC value with the set TVOC standard deviation value, and compares the difference between the first PM2.5 value and the second PM2.5 value with the set PM2.5 standard deviation value;

[0029] The alarm module is configured to issue a TVOC exceeding standard warning when the difference between the first TVOC value and the second TVOC value exceeds the TVOC standard deviation value, and to issue a PM2.5 exceeding standard warning when the difference between the first PM2.5 value and the second PM2.5 value exceeds the PM2.5 standard deviation value;

[0030] The wireless communication unit 14 includes a wireless communication chip 142, an Internet of Things card slot 143, and an external antenna interface 141. The external antenna interface 141 is connected to the wireless communication chip 142, the wireless communication chip 142 is connected to the first processor chip 11, and the Internet of Things card slot 143 is connected to the first processor chip 11;

[0031] The communication module includes a first 485 chip 161, a first 485 interface 162, a second 485 chip 261, and a second 485 interface 262. The first processor chip 11, the first 485 chip 161, and the first 485 interface 162 are connected in sequence. The second processor chip 21, the second 485 chip 261, and the second 485 interface 262 are connected in sequence. The first 485 interface 162 and the second 485 interface 262 are connected via a wired connection. The power supply unit 15 supplies power to the second processor chip 21 via the first 485 interface 162, the wired connection, and the second 485 interface 262 in sequence.

[0032] The power supply unit 15 includes a battery pack 151, a power management chip 152, and a power adapter interface 153. The battery pack 151 and the power adapter interface 153 are both connected to the power management chip 152, and the power management chip 152 is connected to the first processor chip 11;

[0033] like Figure 1 、 2As described, each of the above modules performs data interaction or single or two-way signal control as shown by the arrows. The power supply unit 15 cooperates with the first and second processor chips to provide a stable operating power supply for the device; wherein the SD card slot 194 has a built-in SD card and cooperates with the first processor chip 11 to realize the data storage function; the display 193 cooperates with the first processor chip 11 to realize the digital data storage function; the Internet of Things card slot 143 has a built-in Internet of Things card, and the external antenna interface 141 is connected to the antenna to realize the wireless data transmission and reception and data interaction functions, and the monitoring data can be uploaded to the designated server; the 485 interface and the 485 chip cooperate with the first and second processor chips to form a wired data transceiver unit, which is connected to the external sensor module to realize data transmission; the buzzer 191 cooperates with the first processor chip to realize the over-limit buzzer alarm function in the switch cabinet; the button 192 cooperates with the processor to realize the control functions such as function switching and data trend chart viewing; the first and second TVOC sensors monitor the TVOC content of the decomposition product of the insulation material degradation; the first and second PM2.5 sensors monitor the PM2.5 content of the decomposition product of the insulation material degradation;

[0034] Specifically, the core components in this embodiment can be of the following models:

[0035] The first and second processor chips are stm32f407zet6, the wireless communication chip 142 is EC200N-CN, the power management chip 152 is TP4055, and the battery pack 151 uses a lithium battery pack with a nominal voltage of 3.7V; the display 193 uses a TFT color screen model SX032QW006, the 485 chip uses a communication chip model MAX3485, and the maximum data transmission rate is 10Mbps.

[0036] The first and second temperature sensors and the first and second humidity sensors can use separate temperature sensors and humidity sensors, or an integrated temperature and humidity module, model SHT20. The first and second temperature sensors have a temperature measurement range of -40°C to 125°C, a measurement resolution of 0.01°C, and a detection accuracy of ±0.3°C. The first and second humidity sensors have a humidity measurement range of 0% to 100%RH, a measurement resolution of 0.04%RH, and a detection accuracy of ±3.0%RH.

[0037] The first and second TVOC sensors can use electrochemical sensors, semiconductor sensors or optical sensors with a measurement range of 0-500ppm, a measurement resolution of 0.01ppm, and a detection accuracy of ±3.0%; the first and second PM2.5 sensors use laser particle sensors with a measurement range of 0-1000ug / m3, a measurement resolution of 1.0 ug / m3, and a detection accuracy of ±5.0%.

[0038] Specifically, the specific process of using this device to monitor the insulation status in the switch cabinet is as follows:

[0039] S1. First, use this device to obtain monitoring data:

[0040] This device is used to obtain data on the first TVOC value, the second TVOC value, the first PM2.5 value, the second PM2.5 value, the temperature and humidity inside the switch cabinet, and the temperature and humidity outside the switch cabinet. The measured first TVOC value, the second TVOC value, the first PM2.5 value, and the second PM2.5 value are then subjected to temperature and humidity compensation correction. The specific temperature and humidity compensation correction method is an existing common method, and this embodiment illustrates one of these correction methods.

[0041] The first TVOC value and the first PM2.5 value are corrected using the values ​​monitored by the first temperature sensor and the first humidity sensor, and the second TVOC value and the second PM2.5 value are corrected using the values ​​monitored by the second temperature sensor and the second humidity sensor. The following formula is used for specific correction:

[0042] C2=C1-C1*(T-25)*0.01+C1*(H-60)*0.005; (1)

[0043] Among them, C2 is the corrected TVOC value (unit: ppm) or PM2.5 value (unit: ug / m 3 );

[0044] C1 is the TVOC value (unit: ppm) or PM2.5 value (unit: ug / m 3 );

[0045] T is the temperature value directly measured by the temperature sensor (unit: °C);

[0046] H is the humidity value directly measured by the humidity sensor (unit: %RH);

[0047] When T≧25℃ and H≧60%RH, T takes the real-time monitoring value, and H takes the real-time monitoring value and substitutes it into formula (1) for calculation;

[0048] When T < 25°C and H < 60%RH, T is fixed at 25°C and H is fixed at 60%RH and substituted into the above formula (1) for calculation;

[0049] When T < 25°C and H ≥ 60% RH, T is fixed at 25°C, and H is the real-time monitoring value and substituted into the above formula (1) for calculation;

[0050] When T≧25℃ and H<60%RH, T takes the real-time monitoring value and H takes the fixed value of 60%RH and substitutes them into the above formula (1) for calculation.

[0051] S2. Define the difference between the first corrected TVOC value and the second corrected TVOC value in the switch cabinet as G1; the difference between the first corrected PM2.5 value and the second corrected PM2.5 value as G2;

[0052] The insulation status inside the switchgear is defined as three levels: good insulation status, fair insulation status, and poor insulation status. Specifically, good insulation status means no damage to the surface of the insulation parts (the insulation material inside the switchgear is in good condition and there is no potential insulation risk); fair insulation status means slight damage to the insulation material (no operation and maintenance of the switchgear is required in the short term, but continuous monitoring of the data is required); poor insulation status means obvious damage to the surface of the insulation material that is visible to the naked eye (an operation and maintenance plan needs to be formulated in the short term for inspection and repair).

[0053] Using the above method, through a large number of experiments, we obtained:

[0054] When the insulation condition is good, G2<200 ug / m 3 ;

[0055] When the insulation state is normal, 200ug / m 3 ≤G2≤1000 ug / m 3 , 5ppm≤G1<50ppm;

[0056] When the insulation condition is poor, 200ug / m 3 ≤G2≤1000 ug / m 3 , G1≥50ppm.

[0057] After obtaining the above test data, the staff can select a certain value of G1 and G2 under normal or poor insulation conditions as the threshold according to actual needs. Whether TVOC or PM2.5 exceeds the standard, an early warning can be issued through the alarm module, thereby achieving the purpose of using this device to monitor the insulation status in the switch cabinet in real time.

[0058] Using the above data, this device has two detection modes: online monitoring mode and patrol detection:

[0059] 1. Application in online monitoring of medium voltage switchgear;

[0060] The monitoring device is configured to online monitoring mode. In this mode, the sampling period of the first and second TVOC sensors, the first and second PM2.5 sensors, the first and second temperature sensors, and the first and second humidity sensors is set to 5-30 minutes. The monitoring device will perform sampling and analysis at intervals of 5-30 minutes, and the detection data will be stored and displayed locally. The data will also be uploaded to the designated server. When the data reaches the set alarm threshold, a buzzer will be prompted, and the data can also be processed by the server. When the alarm value is reached, the alarm device on the server will automatically send an alarm message to notify the operation and maintenance personnel. This device is installed in the instrument room, cable room, or busbar room of the medium-voltage switchgear. The device is powered by the secondary power supply inside the medium-voltage switchgear.

[0061] Applied to patrol inspection of medium voltage switchgear;

[0062] Use a lithium battery pack to provide operating power for this device, configure the monitoring device to patrol mode, set the sampling period to 1s, turn on the device sampling switch, check that the device is operating normally, close the instrument room cover, and test continuously for 10-20 minutes. After the test is completed, turn off the device power. The data storage and transmission method is the same as the first online monitoring mode.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A fusion online monitoring device for insulation status of a medium voltage switchgear, characterized by: It includes a power supply unit, an alarm module, a host module and an external sensor module; the power supply unit is used to supply power to the host module and the external sensor module; The host module includes a first processor chip and a wireless communication unit, a first TVOC sensor, and a first PM2.5 sensor, all of which are connected to the first processor chip; the first TVOC sensor is used to monitor the TVOC in the medium-voltage switchgear in real time as a first TVOC value, and the first PM2.5 sensor is used to monitor the PM2.5 in the medium-voltage switchgear in real time as a first PM2.5 value; The external sensor module includes a second processor chip and a second TVOC sensor and a second PM2.5 sensor both connected to the second processor chip; the second TVOC sensor is used to monitor the TVOC of the external environment of the medium-voltage switchgear in real time as a second TVOC value, and the second PM2.5 sensor is used to monitor the PM2.5 of the external environment of the medium-voltage switchgear in real time as a second PM2.5 value; The first processor chip is connected to the second processor chip through the communication module, and the wireless communication unit wirelessly uploads the first TVOC value and the first PM2.5 value monitored by the first processor chip and the second TVOC value and the second PM2.5 value monitored by the second processor chip to a designated server; The server and the alarm module are installed in a remote control room, the alarm module is connected to the server, the server is used to save the first TVOC value, the first PM2.5 value, the second TVOC value and the second PM2.5 value, and the processor in the server compares the difference between the first TVOC value and the second TVOC value with the set TVOC standard deviation value, and compares the difference between the first PM2.5 value and the second PM2.5 value with the set PM2.5 standard deviation value; The alarm module is used to issue a TVOC exceeding standard warning when the difference between the first TVOC value and the second TVOC value exceeds the TVOC standard deviation value, and to issue a PM2.5 exceeding standard warning when the difference between the first PM2.5 value and the second PM2.5 value exceeds the PM2.5 standard deviation value.

2. The fusion online monitoring device for insulation status of a medium voltage switchgear according to claim 1 is characterized in that: The host module is installed in the medium-voltage switchgear, and the external sensor module is installed outside the medium-voltage switchgear.

3. The fusion online monitoring device for insulation status of a medium voltage switchgear according to claim 1 is characterized in that: The wireless communication unit includes a wireless communication chip, an Internet of Things card slot and an external antenna interface. The external antenna interface is connected to the wireless communication chip, the wireless communication chip is connected to the first processor chip, and the Internet of Things card slot is connected to the first processor chip.

4. The fusion online monitoring device for insulation status of a medium voltage switchgear according to claim 1 is characterized in that: The host module further includes a first temperature sensor and a first humidity sensor, both of which are connected to the first processor chip.

5. The fusion online monitoring device for insulation status of a medium voltage switchgear according to claim 1 is characterized in that: The external sensor module further includes a second temperature sensor and a second humidity sensor, and the second temperature sensor and the second humidity sensor are both connected to the second processor chip.

6. The fusion online monitoring device for insulation status of a medium voltage switchgear according to claim 1 is characterized in that: The communication module includes a first 485 chip, a first 485 interface, a second 485 chip and a second 485 interface. The first processor chip, the first 485 chip and the first 485 interface are connected in sequence. The second processor chip, the second 485 chip and the second 485 interface are connected in sequence. The first 485 interface and the second 485 interface are connected by wire.

7. The fusion online monitoring device for insulation status of a medium voltage switchgear according to claim 1 is characterized in that: The power supply unit includes a battery pack, a power management chip, and a power adapter interface. The battery pack and the power adapter interface are both connected to the power management chip, and the power management chip is connected to the first processor chip.

8. The fusion online monitoring device for insulation status of a medium voltage switchgear according to claim 1 is characterized in that: The first processor chip is also connected to a display, an SD card slot, a buzzer and buttons.

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