CN209979068U - Dot matrix infrared cable chamber temperature measuring device based on scheduling network - Google Patents
Dot matrix infrared cable chamber temperature measuring device based on scheduling network Download PDFInfo
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- CN209979068U CN209979068U CN201920724332.2U CN201920724332U CN209979068U CN 209979068 U CN209979068 U CN 209979068U CN 201920724332 U CN201920724332 U CN 201920724332U CN 209979068 U CN209979068 U CN 209979068U
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Abstract
The utility model discloses a dot matrix infrared cable chamber temperature measuring device based on a dispatching network, which comprises at least one sensing terminal, a distributed control terminal, a monitoring management machine, a communication management machine, a station control layer switch, a dispatching data network and a remote background which are arranged in a cable chamber; the sensing terminal is connected to the distributed control terminal through an RS485 bus; the distributed control terminal is connected to a monitoring management machine through an optical fiber, the monitoring management machine is connected to a communication management machine, the communication management machine is connected to a station control layer switch, and the station control layer switch and a remote background are connected to a dispatching data network; realize the real-time supervision of the indoor temperature of cable, in time discover unusual and send out and report an emergency and ask for help or increased vigilance to the personnel on duty in the cabinet, avoid the emergence of cubical switchboard accident, reduce fortune dimension personnel inspection time and maintainer operating time.
Description
Technical Field
The utility model relates to a dot matrix infrared cable chamber temperature measuring device based on dispatch network.
Background
In an electric power system, a switch cabinet of a transformer substation is important equipment for ensuring stable and reliable power supply. The existing electric equipment has higher and higher requirements on the reliability of power supply, and the working reliability of a high-voltage switch cabinet is closely related to the partial discharge of a cable head, the temperature rise of a handcart contact and the temperature and humidity in the cabinet under the states of high voltage and large current. At present, the causes of switch cabinet accidents mainly focus on the aspects of contact heating, partial discharge accompanied heating of cable heads, insulation performance reduction caused by overhigh humidity in cable rooms and the like.
The realization is to the monitoring of cubical switchboard internal environment, can in time discover potential defect in the cabinet, avoids the defect to enlarge, leads to the occurence of failure. At present, the defects of low efficiency and incapability of finding defects in time exist in the method that field personnel mainly hold detection equipment for field monitoring aiming at local over-temperature and local discharge in a cabinet; the non-contact infrared temperature measurement adopted in the market adopts single-point temperature measurement, has the defects of large temperature measurement error, small range and the like, and is less in application; aiming at the humidity monitoring in the cabinet, the humidity monitoring is mainly realized by adopting a temperature and humidity controller at present, and the problems of poor data real-time performance and incapability of on-line monitoring exist.
SUMMERY OF THE UTILITY MODEL
The utility model provides a dot matrix infrared cable chamber temperature measuring device based on dispatch network, it has overcome in the background art the not enough of prior art.
The utility model provides a technical scheme that its technical problem adopted is:
a dot matrix infrared cable chamber temperature measuring device based on a dispatching network comprises at least one sensing terminal, a distributed control terminal, a monitoring management machine, a communication management machine, a station control layer switch, a dispatching data network and a remote background which are arranged in a cable chamber; the sensing terminal is connected to the distributed control terminal through an RS485 bus; the distributed control terminal is connected to the monitoring management machine through an optical fiber, the monitoring management machine is connected to the communication management machine, the communication management machine is connected to the station control layer switch, and the station control layer switch and the remote background are connected to the dispatching data network; the sensing terminal comprises a holder and an infrared array sensor carried on the holder; the sensing terminal in each cable chamber is connected to the monitoring management machine after being connected with a distributed control terminal;
the infrared array sensor and the holder drive the infrared array sensor to rotate and scan to acquire global temperature information in the cable chamber; whether partial discharge or abnormal local temperature rise occurs in the cable chamber is judged according to global temperature information in the cable chamber obtained by the infrared array sensor;
the distributed control terminal issues a control frame to the sensing terminal according to a control instruction of the monitoring management machine, acquires and stores information obtained by the sensing terminal and sends the information obtained by the sensing terminal to the monitoring management machine;
the monitoring management machine receives and summarizes the information uploaded by each distributed control terminal, transmits the information to the remote background in a unified mode, and receives control instructions sent by the remote background.
In one embodiment: this perception terminal still includes humidity transducer, and this humidity transducer establishes on the cloud platform.
In one embodiment: the infrared array sensor adopts an infrared array sensor with the model number of MLX 90640.
In one embodiment: the sensing terminal is arranged at the back of the cabinet door of the cable chamber.
In one embodiment: the sensing terminal is installed on a C45 electric appliance installation guide rail in a cable chamber.
In one embodiment: the monitoring management machine is connected with and supplies power after passing through an air circuit breaker through a direct current bus in a direct current feeder screen of the main control room, and the distributed control terminal is connected with and supplies power after passing through the air circuit breaker through a screen top small bus corresponding to the switch cabinet.
In one embodiment: the distributed control terminal is provided with a DC-DC voltage reduction module, and the DC-DC voltage reduction module is connected to the sensing terminal and used for supplying power to the sensing terminal.
In one embodiment: the monitoring system comprises two mutually standby monitoring managers which are respectively connected with a distributed control terminal through optical fibers.
In one embodiment: the monitoring management machine is provided with an RS-45 interface, and the RS-45 interface is connected with a color touch screen and is used for calling and checking the temperature condition, the humidity condition, the alarm information and the historical information of each cable chamber and providing a patrol interface for operation and maintenance personnel.
Compared with the background technology, the technical scheme has the following advantages:
1. according to the scheme, a non-contact temperature measurement infrared array sensor is introduced creatively, and the infrared array sensor is utilized to realize the omnibearing on-line monitoring and early warning of the operating temperature of the conductive part of the primary equipment in the cable chamber of the switch cabinet; collect partial discharge monitoring, cable chamber equipment operating temperature monitoring, humiture monitoring in the cabinet in an organic whole, realize real-time supervision, in time discover in the cabinet unusual and send out and report an emergency and ask for help or increased vigilance to the personnel on duty, avoid the emergence of cubical switchboard accident, reduce fortune dimension personnel and patrol time and maintainer operating time.
2. Temperature and humidity information measured in a cable room of the system needs to be transmitted to a remote place (namely a remote background, a dispatching center, a data monitoring center and the like of a power supply company in a power system). The dispatching data network is in a power supply company, equipment of the transformer substation is connected to an internal private data network of a dispatching center in a company office building, and data safety is achieved. Therefore, in the patent, temperature and humidity data are transmitted to a dispatching center of a company through a dispatching data network, so that the integrity and the safety of data transmission are ensured, and the information safety requirement of a national network company is met.
3. The monitoring management machine is connected with and supplies power after passing through an air circuit breaker through a direct current bus in a direct current feeder screen of the main control room, and the distributed control terminal is connected with and supplies power after passing through the air circuit breaker through a screen top small bus corresponding to the switch cabinet. The distributed control terminal is provided with a DC-DC voltage reduction module, and the DC-DC voltage reduction module is connected to the sensing terminal and used for supplying power to the sensing terminal. The existing direct-current voltage of the transformer substation is adopted for more stable power supply, and compared with power supply modes such as storage battery power supply and CT power taking, the circuit design complexity and the power supply stability are effectively reduced.
4. The utility model discloses the device utilizes the current communication management machine of transformer substation to insert the scheduling data network and realizes distant place telemetering measurement and remote signalling for this temperature measuring device is integrated as an organic whole with current power dispatching center, and the power dispatching center of being convenient for again of the construction resource of economizer is managed the device's unity promptly.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a block diagram of a system structure of the temperature measurement system according to this embodiment.
Fig. 2 is a second block diagram of the temperature measuring system according to the present embodiment.
Fig. 3 is a data transmission architecture diagram of the temperature measuring device according to this embodiment.
Fig. 4 is a power supply structure diagram of the sensing terminal, the distributed control terminal, and the monitoring manager according to this embodiment.
Detailed Description
Referring to fig. 1 and fig. 2, a dot matrix infrared cable chamber temperature measuring device based on a scheduling network includes at least one sensing terminal 10, a distributed control terminal 20, a monitoring manager 30, a communication manager 40, a station control layer switch 50, a scheduling data network 60, and a remote background 70, which are arranged in a cable chamber; the sensing terminal 10 is connected to the distributed control terminal 20 through an RS485 bus; the distributed control terminal 20 is connected to the monitoring management machine 30 through an optical fiber, preferably, the optical fiber is a multimode optical fiber, which can effectively avoid the interference of the strong magnetic environment of the switch cabinet on signal transmission, the monitoring management machine 30 is connected to the communication management machine 40, the communication management machine 40 is connected to the station control layer switch 50, and the station control layer switch 50 and the remote background 70 are both connected to the scheduling data network 60; the sensing terminal 10 comprises a holder 11 and an infrared array sensor 12 carried on the holder 11; the sensing terminal 10 in each cable chamber is connected to the monitoring management machine 30 after being connected with a distributed control terminal 20; and one distributed control terminal is correspondingly connected with all sensing terminals in one cable chamber.
The infrared array sensor 12 and the holder 11 drive the infrared array sensor 12 to rotate and scan to obtain the global temperature information in the cable chamber; whether partial discharge or abnormal local temperature rise occurs in the cable chamber is judged according to global temperature information in the cable chamber obtained by the infrared array sensor 12;
the distributed control terminal 20 issues a control frame to the sensing terminal 10 according to the control instruction of the monitoring manager 30, acquires and stores the information obtained by the sensing terminal 10, and sends the information obtained by the sensing terminal 10 to the monitoring manager 30;
the monitoring management machine 30 receives and summarizes the information uploaded by each distributed control terminal 20, and transmits the information to the remote background 70 in a unified manner, and also receives a control instruction from the remote background 70.
The sensing terminal 10 further includes a humidity sensor 13, and the humidity sensor 13 is disposed on the pan/tilt head 11.
Referring to fig. 3, the system is divided into five layers: the first layer is an application layer (namely a remote background and an SCADA system) and realizes remote temperature visualization and query statistics functions; the second layer is a data transmission layer which is an existing scheduling data network 60 (complying with IEC60870-5-101 protocol), and a data communication borrowing scheduling data network channel of the system and a remote background 70; the third layer is a station control layer, which is completed by the monitoring management machine 30, collects the data uploaded by all the distributed control terminals 20 on the lower layer, and uploads the data to the scheduling data network 60 after protocol conversion, and meanwhile, receives the control instruction from the application layer, and sends the control instruction to the distributed control terminals 20 corresponding to the cable room after analysis, verification and unpacking; the fourth layer is a physical execution layer, and is composed of a distributed control terminal 20 and a sensing terminal 10, the distributed control terminal 20 controls the pan-tilt of the sensing terminal 10 to rotate according to a received control instruction, measures the temperature information of 768 collection points (in this embodiment, the infrared array sensor 12 of the sensing terminal 10 adopts an infrared array sensor of model MLX 90640), sends the temperature information to the monitoring manager 30 after data compression processing (reducing the amount of transmission data and reducing the space occupied by a Flash chip), and sends the data to the monitoring manager 30.
The whole cable chamber temperature measuring device forms a double-layer star network topology, and the topology is as follows:
a. a plurality of distributed control terminals 20 surround the monitoring manager 30 to form a main star network with the monitoring manager 30 as the center;
b. a plurality of sensing terminals 10 surround the distributed control terminal 20 to form a sub-star network with the distributed control terminal 20 as the center.
The double-layer star network topology of the system body is connected with a station control layer network of a transformer substation through a communication manager, the monitoring manager 30 and the communication manager 40 adopt RJ45 interfaces, and a standard IEC60870-5-103 protocol is used for realizing data uploading and receiving, so that the system is suitable for most of the existing communication managers 40 of the transformer substation, and the universality of the system is improved.
The distributed control terminal 20 and the monitoring management machine 30 realize high-speed data transmission by using two multimode optical fibers, the distributed control terminal 20 is connected with all the sensing terminals 10 in a corresponding single cable chamber only through an RS485 bus, and all the cloud deck 11, the infrared array sensor 12 and the humidity sensor 13 are mounted on a pair of RS-485 buses, so that the wiring complexity is reduced, and one-to-many control is realized.
Preferably, the system body includes two monitoring managers 30, the two monitoring managers 30 are standby each other, and the two monitoring managers 30 are connected with the distributed control terminal 20 through two optical fibers respectively, so as to realize high-speed data transmission. Meanwhile, the RJ45 is connected to the communication management machine 30, seamless switching can be achieved, and stability is improved.
The communication manager 40 performs unified conversion on each data, accesses the substation control layer switch 50, further accesses the scheduling data network 60, and realizes data telecontrol transmission.
The sensing terminal 10 mainly comprises a cradle head 11, a humidity sensor 13 and an MLX90640 infrared array sensor 12, wherein the infrared array sensor 12 is installed on the cradle head, the temperature measurement of the whole space in a cable chamber is realized through the rotation of the cradle head 11, the partial discharge condition and the temperature rise condition of primary equipment are monitored in real time, and the humidity sensor 13 installed on the cradle head 11 acquires the air humidity condition in the cable chamber.
The peloc protocol establishes connection between the sensing terminal 10 and the distributed control terminal 20, and the sensing terminal 10 analyzes the received data frame to further judge whether the control instruction is to control the holder 11 to rotate or to acquire temperature information and to give corresponding response.
An air temperature sensor 13 arranged on the holder 11 can perform 24-hour online monitoring on the air humidity condition of the cable chamber.
The infrared array sensor MLX90640 establishes array acquisition points for 32 x 24 positions within a field range of 55 degrees multiplied by 35 degrees, temperature information of 768 positions can be acquired in one acquisition period, and the target temperature range is-40 ℃ to +300 ℃. 768 temperature information acquired by the infrared array sensor 12 is verified and then is sent to the distributed control terminal 20 in a centralized mode in one frame, the distributed control terminal 20 receives, restores and verifies the original data, and judges, compresses and stores or forwards the temperature information to the monitoring management machine after the temperature information is confirmed to be effective. Due to the single-point temperature measurement mode, the problems of large measurement blind area, low measurement efficiency and the like exist, and the single-point temperature measurement mode is matched with the holder for use, so that the requirements on the control speed and the control precision of the holder are quite high; compared with the existing 64-point sensor, the method for collecting information of 768 positions has the advantages that the measurement density of a unit field of view is higher, the sensitivity to the position with temperature difference is higher, and a panoramic temperature cloud picture is easy to construct.
The operation process of the perception terminal 10 is as follows: each sensing terminal 10 operates independently and does not interfere with each other, and the working mode of the sensing terminal 10 is controlled by a distributed control terminal. Each perceiving terminal 10 has three modes of operation: a. a periodic scanning mode; b. a multi-fixed-point high-frequency scanning mode; c. manual mode. The periodic scanning mode is a conventional working mode, and the pan-tilt 11 carrying the infrared array sensor 12 performs omni-directional scanning at a set time interval (for example, two hours, which can be adjusted according to actual conditions). Multiple fixed-point high-frequency scanning mode: when the temperature of the conductive part of the cable chamber is abnormal (temperature is increased and partial discharge occurs), the distributed control terminal 20 automatically stores the position information of the current abnormal part, and increases the monitoring frequency of the abnormal part to achieve the purpose of strengthening tracking. Manual mode: the manual mode supports manual control of the perceiving terminal 10 by a user at the distributed control terminal 20, at the monitoring manager 30, at a remote backend 70 (i.e., SCADA system).
The technical indexes and structures designed by the sensing terminal 10 are as follows: protection level IP66, horizontal 170 continuous rotation, vertical 180 continuous rotation support cloud platform 11 automatic cruise, design 5 cruise route, each can set up 5 and patrol the navigation point. The working temperature is-25 ℃ to +65 ℃.
The distributed control terminal 20 described in this embodiment has the following main functions: a. directly controlling the rotation angle and direction of the holder 11; b. directly acquiring the temperature and humidity of the indoor air of the cable; c. directly issuing a control frame to the sensing terminal according to a control instruction of the monitoring management machine 30 to acquire a temperature data frame; d. compressing and storing the current temperature data frame according to the historical data; e. responding to a control instruction of the monitoring management machine 30, uploading the air humidity and temperature of the current interval cable chamber, the temperature of the conductive part of the primary equipment and the partial discharge condition; f. the temperature rise condition and the partial discharge condition of the primary equipment conductive part of the cable chamber are analyzed and judged on site, an alarm (strong light LED flicker and sound alarm) is sent on site, and abnormal telecontrol information is sent.
The hardware configuration of the distributed control terminal 20: the master control chip adopts a CPLD chip, in this example, MAX II EPM1270 of ALTERA is adopted; two paths of optical fiber transmitting ports; two optical fiber receiving ports; an RS-485 communication interface; and carrying the static random access memory as a data processing temporary storage space.
The distributed control terminal 20 is provided with a human-computer interaction interface. The distributed control terminal 20 directly displays the temperature (absolute temperature or judgment temperature, which will be described later) of each collection point in a 32 × 24 table, and can manually control the azimuth angle and the elevation angle of the pan/tilt head through the human-computer interaction interface.
The distributed control terminal 20 has a plurality of operation modes: a monitoring mode; an ultra-low power mode; sleep mode, etc. When the periodic monitoring task is completed, the system automatically enters an ultra-low power consumption mode, and if the system does not work for more than 10 minutes, the system enters a sleep mode, and the sleep mode can be awakened by an external key terminal or an awakening instruction of the upper monitoring management machine 30, so that the system enters a working mode.
The distributed control terminal 20 can monitor the indoor humidity condition of the cable and support the sending of an alarm signal, and an alarm is sent when the humidity is higher than 70%.
The monitoring management machine 30 described in this embodiment has a function of receiving and summarizing the abnormal information, the temperature cloud map information, the cable chamber humidity and other information of each distributed control terminal 20, and uniformly packaging and uploading the information to the substation control layer network of the substation; control instructions from a remote background 70(SCSDA system) are received, and a data transfer and summarization function is achieved.
The monitoring management machine 30 is provided with a human-computer interaction interface, can directly display the temperature (absolute temperature or judgment temperature) of each acquisition point in a 32 × 24 table, and can manually control the azimuth angle and the elevation angle of the pan-tilt on the human-computer interaction interface. The visualization of the temperature (absolute temperature or judgment temperature) of the collection point is supported, and the generated temperature cloud picture is visually displayed in a human-computer interaction interface. In this embodiment, the monitoring manager accesses the DMT80480T070 — 07WT color touch screen 80 through RS-45, and can retrieve the basic conditions of the temperature cloud map, the air humidity, the alarm information, the history information and the like of each cable compartment on site, so as to provide a patrol interface for operation and maintenance personnel.
The monitoring management machine 30 supports simultaneous transmission of multiple paths of optical fiber data, an FPGA chip of an ALTERA CYCLONE IV is adopted, a communication circuit is configured inside the FPGA chip, synchronous data transmission of the monitoring management machine 30 to multiple sensing terminals 10 is achieved, multiple pins can be 200, the monitoring management machine can run in parallel, and the transmission rate can reach 50 Mbps. The monitoring management machine 30 is equipped with a K9W4G08U1M large-capacity memory chip (the memory capacity can reach 512M, depending on the chip actually used) for storing information such as abnormal information and temperature cloud charts.
Referring to fig. 4, the monitoring manager 30 is connected to supply power through the dc bus 101(220V) in the dc feeder panel of the main control room via an air circuit breaker (e.g., 10A air circuit breaker), and the distributed control terminal 20 is connected to supply power through the corresponding panel top small bus 102 (i.e., the dc power supply on the surface layer of the switch cabinet) via the air circuit breaker.
The distributed control terminal 20 is provided with a DC-DC voltage reduction module 21, and the DC-DC voltage reduction module 21 is connected to the sensing terminal 10 and used for supplying power to the sensing terminal 10. The DC-DC voltage reduction module 21 adjusts the high-voltage direct current to 12V and 5V, the 12V is used by the cradle head 11, and the 5V is used as a power supply for the infrared array sensor 12 and the humidity sensor 13.
The existing 220V direct-current voltage of the transformer substation is adopted for more stable power supply, and compared with power supply modes such as storage battery power supply and CT power taking, the circuit design complexity and the power supply stability are effectively reduced. In case the transformer substation's cubical switchboard drops into operation, all cabinet doors of cubical switchboard (including cable room door, bus-bar room door, handcart room door etc.) must not open, adopt the battery power supply mode, need change the battery after operation a period, the maintenance volume is great, and the difficult monitoring of battery power condition, the low voltage will influence this system normal work, get the electric installation through the installation current transformer of the department of being qualified for the next round of competitions at handcart conducting arm or cable, circuit design's complexity has been increased, and be close to a high-voltage part, factor of safety is lower. Therefore, the system adopts a mode of 220V direct-current power supply of the switch cabinet, is matched with an overcurrent protection air switch and a leakage protection air switch, and is low in design complexity and high in power supply stability.
The mounting mode of the pan-tilt 11 of the sensing terminal 10 has two types: 1. the base of the cradle head 11 can be attached to the upper surface of the rear cabinet door of the cable chamber through a strong magnet (strong magnetic type); 2. and C45 electric appliance mounting guide rails (U-shaped guide rails) directly installed in the cable chamber. The installation position is determined according to the arrangement condition of primary equipment in the cable chamber and the size of the space.
The power line and the data line of the sensing terminal 10 are connected to the distributed control terminal 20 through a switch cabinet cable chamber and a secondary wiring channel on the surface layer of the switch cabinet instrument, so that the maintenance and the overhaul are convenient.
The distributed control terminal 20 is installed on a cabinet door on the surface layer of the switch cabinet instrument, an embedded installation mode is adopted, the power supply of the sensing terminal 10 is provided by the distributed control terminal 20 corresponding to the interval cable chamber, and the power supply of the distributed control terminal 20 is connected with the screen top direct current small bus 102 through the direct current air switch 2P 10A.
The monitoring management machine 30 is installed in a 10kV public screen cabinet of a main control room of a transformer substation or other public screen cabinets, a power line of the monitoring management machine 30 is connected with a direct current bus in the screen through a screen inner terminal row and a screen top direct current air switch 2P10A, and the monitoring management machine 30 is connected with each spaced distributed control terminal 20 in the switch cabinet through an optical cable.
Because the temperature difference between the environment temperature in winter and summer in the transformer substation room can reach more than 20 ℃, the temperature set by the air conditioner of the switch cabinet, the temperature in the cable room of the switch cabinet and the current feeder load can have great influence on the operation temperature of the primary conductive part of the equipment, so that the absolute temperature value (namely, the directly obtained temperature value) measured by the infrared array sensor 12 and the heating condition of the primary conductive part do not form a unique determined relation, and therefore, the feeder load current and the air temperature in the cable room are taken into consideration by the scheme, weight factors are set for the feeder load current and the air temperature in the cable room, finally, the judgment temperature forming the unique determined relation with the conductive part is obtained, the heating fault is judged according to the judgment temperature, and the judgment.
Judging whether partial discharge or partial temperature rise abnormality occurs in the cable chamber according to the calculated judgment temperature TdComprises the following steps:
Td＝TR×(α+β)；
wherein: t isRAbsolute temperature values obtained for the infrared array sensors;
when the magnitude of the feeder line load current is (0-40) A, the load weight factor is as follows: α ═ 1;
when the magnitude of the feeder line load current is (40-80) A, the load weight factor is as follows: α is 0.7;
when the magnitude of the feeder line load current is (80-120) A, the load weight factor is as follows: α is 0.5;
when the magnitude of the feeder load current is (120-160) a, the load weight factor is: α is 0.3;
when the magnitude of the feeder load current is (160) A, the load weight factor is as follows: α is 0.1;
when the indoor air temperature of the cable is (0) DEG C, the temperature weight factor is as follows: β is 0.5;
when the indoor air temperature of the cable is (0-10) DEG C, the temperature weight factor is as follows: β is 0.2;
when the indoor air temperature of the cable is (10-20) DEG C, the temperature weight factor is as follows: β is 0.1;
when the indoor air temperature of the cable is (20-30) DEG C, the temperature weight factor is as follows: β is 0.05;
when the indoor air temperature of the cable is greater than 30 ℃, the temperature weight factor is as follows: β ═ 0.
According to the calculated TdThe values were determined for the display color chart of the temperature cloud as shown in table 1. Through the temperature cloud picture, the temperature distribution condition can be more intuitively and finely displayed, according to the actual situation on site, each temperature interval can be subdivided through more display colors, and the display effect is more accurate. The greater the degree of the defect of the primary device heating or partial discharge in the embodimentHigh, the warmer the shade (deep red) and the cooler the normal shade (deep blue).
If the humidity weight factor and the smoke weight factor can still be introduced after the humidity of the cable chamber, the smoke condition and the influence degree on the operation temperature of the primary conductive part are determined, the temperature is calculated and judged, and the measured absolute temperature value is converted, so that the accuracy of judging the heating defect of the primary equipment is further improved.
TABLE 1, TdDisplay color chart for determining temperature cloud picture by value
The temperature set by the air conditioner in the switch room, the temperature in the cable of the switch cabinet and the current feeder load all have great influence on the running temperature of the primary conductive part of the equipment. In order to improve the accuracy of system judgment when the part generates heat, the measurement by adopting a single temperature index is avoided. The system can also establish an equipment operation condition library taking the cable chamber at intervals as a unit, establish a database taking the air humidity, the air temperature and the load current in the cable chamber of the switch cabinet as fields, generate a relation table of the air humidity-temperature, the load current-temperature, the air humidity and the load current-temperature and the like through a large amount of historical operation data, match the current data by the distributed control terminal or the remote SCADA system according to the relation table and by combining the historical data so as to judge whether the partial discharge or the heating phenomenon exists, timely make effective early warning, eliminate the defects at the sprouting stage and ensure the stable operation of the equipment.
The system adopts two data transmission checking modes of row column supervisory codes and error control codes.
For the transmission of control commands: the control command is less relative to the data quantity of the temperature data packet, an error control coding check mode is adopted, some supervision code elements are attached to the transmitted information at the transmitting end, and the supervision code elements and the information code elements are mutually related by a certain rule. Once transmission errors occur, the relationship between the information symbols and the supervisory symbols is destroyed, so that the receiving end (distributed control terminal, monitoring manager, etc.) can find or even correct the errors.
For temperature packet transmission: the row and column supervision code is adopted for checking, because the data volume of the temperature data packet is larger than that of the control instruction, if the error control coding is adopted, although the error can be corrected, the data transmission volume is greatly increased, and the transmission efficiency is reduced, therefore, the checking mode of the temperature data packet transmission adopts the row and column supervision code for checking, the row and column of the data packet adopt the parity check code, so as to find and correct the error of a single code element, and improve the data transmission accuracy.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.
Claims (9)
1. The utility model provides a dot matrix infrared cable chamber temperature measuring device based on dispatch network which characterized in that: the system comprises at least one sensing terminal, a distributed control terminal, a monitoring management machine, a communication management machine, a station control layer switch, a scheduling data network and a remote background which are arranged in a cable chamber; the sensing terminal is connected to the distributed control terminal through an RS485 bus; the distributed control terminal is connected to the monitoring management machine through an optical fiber, the monitoring management machine is connected to the communication management machine, the communication management machine is connected to the station control layer switch, and the station control layer switch and the remote background are connected to the dispatching data network; the sensing terminal comprises a holder and an infrared array sensor carried on the holder; the sensing terminal in each cable chamber is connected to the monitoring management machine after being connected with a distributed control terminal;
the infrared array sensor and the holder drive the infrared array sensor to rotate and scan to acquire global temperature information in the cable chamber; whether partial discharge or abnormal local temperature rise occurs in the cable chamber is judged according to global temperature information in the cable chamber obtained by the infrared array sensor;
the distributed control terminal issues a control frame to the sensing terminal according to a control instruction of the monitoring management machine, acquires and stores information obtained by the sensing terminal and sends the information obtained by the sensing terminal to the monitoring management machine;
the monitoring management machine receives and summarizes the information uploaded by each distributed control terminal, transmits the information to the remote background in a unified mode, and receives control instructions sent by the remote background.
2. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 1, wherein: this perception terminal still includes humidity transducer, and this humidity transducer establishes on the cloud platform.
3. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 1, wherein: the infrared array sensor adopts an infrared array sensor with the model number of MLX 90640.
4. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 1, wherein: the sensing terminal is arranged at the back of the cabinet door of the cable chamber.
5. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 1, wherein: the sensing terminal is installed on a C45 electric appliance installation guide rail in a cable chamber.
6. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 1, wherein: the monitoring management machine is connected with and supplies power after passing through an air circuit breaker through a direct current bus in a direct current feeder screen of the main control room, and the distributed control terminal is connected with and supplies power after passing through the air circuit breaker through a screen top small bus corresponding to the switch cabinet.
7. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 6, wherein: the distributed control terminal is provided with a DC-DC voltage reduction module, and the DC-DC voltage reduction module is connected to the sensing terminal and used for supplying power to the sensing terminal.
8. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 1, wherein: the monitoring system comprises two mutually standby monitoring managers which are respectively connected with a distributed control terminal through optical fibers.
9. The lattice infrared cable chamber temperature measuring device based on the dispatching network as claimed in claim 1, wherein: the monitoring management machine is provided with an RS-45 interface, and the RS-45 interface is connected with a color touch screen and is used for calling and checking the temperature condition, the humidity condition, the alarm information and the historical information of each cable chamber and providing a patrol interface for operation and maintenance personnel.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108366A (en) * | 2019-05-20 | 2019-08-09 | 国网福建省电力有限公司漳州供电公司 | A kind of infrared cable vault's temp measuring system of dot matrix based on dispatch network |
| CN115077605A (en) * | 2022-06-06 | 2022-09-20 | 昂顿科技（上海）有限公司 | Intelligent substation management system |
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2019
- 2019-05-20 CN CN201920724332.2U patent/CN209979068U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108366A (en) * | 2019-05-20 | 2019-08-09 | 国网福建省电力有限公司漳州供电公司 | A kind of infrared cable vault's temp measuring system of dot matrix based on dispatch network |
| CN115077605A (en) * | 2022-06-06 | 2022-09-20 | 昂顿科技（上海）有限公司 | Intelligent substation management system |
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