Real-time online insulation monitoring system for electric heater

Abstract

The utility model discloses a real-time on-line insulation monitoring system for an electric heater, which comprises a main loop control electrical cabinet connected with the electric heater, a micro-control unit connected with the main loop control electrical cabinet, an insulation monitoring unit connected with the micro-control unit, and a power supply unit connected with the micro-control unit. According to the utility model, the PLC technology is adopted, the ground insulation state of the load is obtained in real time in the form of RS485 communication, and the functions of on-line insulation monitoring, insulation fault early warning, insulation fault alarm, insulation event recording, real-time curve recording, historical curve recording and the like of the electric heater are realized. Insulation fault early warning, insulation fault alarm, insulation event recording and insulation data curve before and during startup are realized, the reliability of an insulation monitoring system is improved, the maintenance time and cost are reduced, and the service life of the electric heater is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric heater control technical field, concretely relates to a kind of electric heater real-time online insulation monitoring system. BACKGROUND

[0002] Electrical insulation plays a crucial role in the design, production, use and maintenance of industrial electric heaters, and the quality of electrical insulation determines the design selection, production quality, whether it can be normal start production, maintenance and maintenance of start-stop.

[0003] The existing electric heater control system has the following problems:

[0004] 1, need to manually perform insulation detection before and after installation wiring, after shutdown before starting, and only after passing can be powered on or started;

[0005] 2, the insulation state cannot be monitored in real time during start-up, and the production efficiency is affected when failure occurs;

[0006] To solve the above problems, we propose a kind of electric heater real-time online insulation monitoring system. CONTENT OF UTILITY MODEL

[0007] The utility model aims at providing a kind of electric heater real-time online insulation monitoring system to solve the problems raised in the above background.

[0008] To achieve the above object, the utility model provides the following technical scheme: a kind of electric heater real-time online insulation monitoring system, comprising,

[0009] Main circuit control electrical cabinet, the main circuit control electrical cabinet is connected with electric heater, for controlling the start-stop and power output of the electric heater loop;

[0010] Micro-control unit, the micro-control unit is connected with the main circuit control electrical cabinet, and the micro-control unit is used to send control instruction to the main circuit control electrical cabinet and receive the state feedback of the main circuit control electrical cabinet;

[0011] Insulation monitoring unit, the insulation monitoring unit is connected with the micro-control unit, and the insulation monitoring unit is used to monitor the electric heater ground insulation resistance in real time, and provide early warning, alarm signal and data;

[0012] Host computer terminal, the host computer terminal is connected with the micro-control unit, and the host computer terminal is used to read and display the control data of the micro-control unit.

[0013] Preferably, the micro-control unit is Siemens Smart200PLC.

[0014] Preferably, the microcontroller unit is connected to the main circuit control electrical cabinet via a digital input / output module.

[0015] Preferably, the insulation monitoring unit is an AIM-T300 insulation monitoring device.

[0016] Preferably, the insulation monitoring unit is connected to the microcontroller unit via an RS485 communication port.

[0017] Preferably, the host computer terminal and the microcontroller unit are connected via Ethernet.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model utilizes PLC technology to obtain the load-to-ground insulation status in real time via RS485 communication, realizing functions such as online insulation monitoring, insulation fault early warning, insulation fault alarm, insulation event recording, real-time curve recording, and historical curve recording for electric heaters. It provides insulation fault early warning, insulation fault alarm, insulation event recording, and insulation data curves before and during startup, thereby improving the reliability of the insulation monitoring system, reducing maintenance time and costs, and extending the service life of the heater.

[0020] 2. This utility model adopts microcontroller technology, which has high integration, small size, and convenient installation. It integrates intelligence, digitalization, and networking, and monitors the load insulation status to ground in real time and online. When an insulation fault occurs, it will promptly alarm and remind staff to troubleshoot the fault, eliminating the need for manual shutdown to monitor insulation every time.

[0021] 3. This utility model adopts PLC control, RS485 communication, modular design, flexible configuration, convenient expansion, and easy promotion and application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the electrical principle of this utility model;

[0023] Figure 2 This is a schematic diagram of the electrical circuit connection of this utility model;

[0024] Figure 3 This is a schematic diagram of the human-machine interface of the host computer terminal of this utility model;

[0025] Figure 4 This is a real-time data curve of the ground insulation of the host computer terminal of this utility model;

[0026] Figure 5 This is a graph showing the historical data of the ground insulation of the host computer terminal of this utility model.

[0027] In the figure: 1, main loop control electrical cabinet; 2, electric heater; 3, micro control unit; 4, insulation monitoring unit; 5, host computer terminal. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] Please refer to Figure 1 The electric heater real-time online insulation monitoring system provided by the utility model, comprising,

[0030] The main loop control electrical cabinet 1 is connected with the electric heater 2, and is used for controlling the start-stop and power output of the electric heater 2 loop.

[0031] The micro control unit 3 is connected with the main loop control electrical cabinet 1, and the micro control unit 3 is used for sending control instructions to the main loop control electrical cabinet 1 and receiving the state feedback of the main loop control electrical cabinet 1. The micro control unit 3 is Siemens Smart200PLC, and the micro control unit 3 is connected with the main loop control electrical cabinet 1 through a digital quantity input / output module. The micro control unit 3 controls the start-stop and power output of the electric heater 2 loop through the main loop control electrical cabinet 1. The micro control unit 3 is connected with the insulation monitoring unit through an RS485 communication port, and real-time insulation data detected in the insulation monitoring unit is read.

[0032] The insulation monitoring unit 4 is connected with the micro control unit 3, and the insulation monitoring unit 4 is used for monitoring the insulation resistance of the electric heater 2 to ground in real time, and providing early warning, alarm signals and data. The insulation monitoring unit 4 is AIM-T300 insulation monitoring device, and the insulation monitoring unit 4 is connected with the micro control unit 3 through an RS485 communication port. The insulation monitoring unit 4 realizes functions such as wire breakage monitoring, real-time monitoring of the insulation resistance of the electric heater 2 to ground, insulation fault early warning, insulation fault alarm, RS485 Modbus-RTU communication and the like.

[0033] The host computer terminal 5 is connected with the micro control unit 3, and the host computer terminal 5 is used for reading and displaying the control data of the micro control unit 3. The host computer terminal 5 is connected with the micro control unit 3 through Ethernet. The host computer terminal 5 reads and writes the control data of the micro control unit 3 in real time, and is used as a man-machine interface, data recording and trend display.

[0034] The utility model discloses a microcontrol unit 3, insulation monitoring unit 4 and host computer terminal 5 are adopted, and microcontrol unit 3 is as user main control PLC, realizes the switching of high -power load, control, alarm, protection and so on, and microcontrol unit 3 is connected to insulation monitoring unit 5 through RS485, and real -time reading load ground insulation state, and through host computer terminal 5 real -time display, record, when the insulation anomaly occurs, timely alarm, remind staff to investigate the trouble, and the utility model discloses a microcontrol unit 3, insulation monitoring unit 4 and host computer terminal 5 are adopted, and microcontrol unit 3 is as user main control PLC, realizes the switching of high -power load, control, alarm, protection and so on, and microcontrol unit 3 is connected to insulation monitoring unit 5 through RS485, and real -time reading load ground insulation state, and through host computer terminal 5 real -time display, record, when the insulation anomaly occurs, timely alarm, remind staff to investigate the trouble,

[0035] Among them, the specific working process of the system is as follows:

[0036] Insulation monitoring data: insulation monitoring unit 4→microcontrol unit 3→host computer terminal 5 (real-time display and storage);

[0037] Control instruction: host computer terminal 5→microcontrol unit 3→main loop control electrical cabinet 1 (loop start / stop / power regulation).

[0038] Early warning, alarm signal: insulation monitoring unit 4→microcontrol unit 3→host computer terminal 5 (trigger early warning, alarm prompt);

[0039] As shown in Figure 2 , it is an electrical circuit diagram of the system, which is well known to those skilled in the art and will not be described here;

[0040] As shown in Figure 3 , it is a man-machine interface diagram of the host computer terminal 5 in the system, which can display the working state and insulation monitoring state of the electric heater 2 in real time;

[0041] As shown in Figure 4 and Figure 5 , it is a real-time data curve diagram and a historical data curve diagram of the ground insulation of the host computer terminal 5 of the system, which can display the insulation monitoring data curve state of the electric heater 2 in real time;

[0042] The control programs between the microcontrol unit 3, the insulation monitoring unit 4 and the host computer terminal 5 in the utility model are all prior art, which is well known to those skilled in the art and will not be described here;

[0043] The utility model has the following beneficial effects:

[0044] 1, the utility model discloses a real -time ground insulation state of load is obtained in real time with RS485 communication form by using PLC technology, realizes electric heater online insulation monitoring, insulation fault early warning, insulation fault alarm, insulation event record, real -time curve record, historical curve record and so on, realizes insulation fault early warning, insulation fault alarm, insulation event record, insulation data curve before starting, in starting, improves the reliability of insulation monitoring system, reduces maintenance time and cost, prolongs the service life of heater;

[0045] 2、The utility model discloses adopt microcontroller technology, and the high integration degree is small, and the installation is convenient, and the intelligence, digitization, network are all in one, and real -time, on -line monitoring load ground insulation state, when the insulation failure occurs, timely alarm, remind staff to investigate the trouble, need not each artificial shutdown monitoring insulation operation every time;

[0046] 3、The utility model discloses adopt PLC control, RS485 communication form, modular design, and the configuration is flexible, convenient extension, easy to promote application.

[0047] Although the embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A real-time online insulation monitoring system for an electric heater, characterized in that, include, The main circuit control electrical cabinet (1) is connected to the electric heater (2) and is used to control the start and stop of the circuit and the power output of the electric heater (2); Microcontroller (3), the microcontroller (3) is connected to the main circuit control electrical cabinet (1), the microcontroller (3) is used to send control commands to the main circuit control electrical cabinet (1) and receive status feedback from the main circuit control electrical cabinet (1); Insulation monitoring unit (4), which is connected to the microcontroller unit (3), is used to monitor the insulation resistance of the electric heater (2) to ground in real time and provide early warning, alarm signals and data; The host computer terminal (5) is connected to the microcontroller unit (3) and is used to read and display the control data of the microcontroller unit (3).

2. The real-time online insulation monitoring system for an electric heater according to claim 1, characterized in that: The microcontroller unit (3) is a Siemens Smart200 PLC.

3. The real-time online insulation monitoring system for an electric heater according to claim 2, characterized in that: The microcontroller unit (3) is connected to the main circuit control electrical cabinet (1) via a digital input / output module.

4. The real-time online insulation monitoring system for an electric heater according to claim 1, characterized in that: The insulation monitoring unit (4) is an AIM-T300 insulation monitoring device.

5. The real-time online insulation monitoring system for an electric heater according to claim 4, characterized in that: The insulation monitoring unit (4) is connected to the microcontroller unit (3) via an RS485 communication port.

6. The real-time online insulation monitoring system for an electric heater according to claim 1, characterized in that: The host computer terminal (5) and the microcontroller unit (3) are connected via Ethernet.

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