CN202066606U - Intelligent temperature-measuring and current-measuring contact arm for circuit breaker and analysic system thereof - Google Patents

Abstract

The utility model discloses an intelligent temperature-measuring and current-measuring contact arm of a circuit breaker and an analysis system thereof, comprising a contact arm body, an induction power-taking module, a temperature sensor, a current measuring coil, a signal conditioning module, a data processing module and a first wireless communication module The inductive power-taking module senses and obtains current and provides power; the temperature sensor is embedded in the body of the contact arm to detect the temperature of the contact area between the contact arm and the contact; the current measurement coil is nested on the body of the contact arm to measure The current of the arm; the current measuring coil is connected to the data processing module through the signal conditioning module, the temperature sensor is connected to the data processing module, and the data processing module is also connected to the first wireless communication module. The analysis system also includes a wireless terminal for connecting with the temperature measuring current contact arm and analyzing the temperature data and current data. The utility model can not only realize direct measurement of temperature and current under high voltage, but also realize data transmission, alarm and monitoring.

Description

A circuit breaker intelligent temperature measuring current measuring arm and its analysis system

technical field

The utility model relates to the field of on-line monitoring of circuit breakers, in particular to a contact arm for monitoring the temperature and current of a main circuit of a circuit breaker and an analysis system thereof.

Background technique

The circuit breaker is one of the key components to ensure the safe and reliable operation of the power transmission and distribution system. The normal operation of the circuit breaker is related to the stability of the power system. Therefore, it is especially important to ensure the reliable operation of the circuit breaker. In circuit breaker failures and accidents, problems caused by excessive temperature rise of the main circuit occupy a certain proportion.

The temperature of the main circuit of the circuit breaker is too high or abnormal, mainly due to the poor contact of the dynamic and static contacts and the increase of the contact resistance, resulting in abnormal temperature of the circuit. If you fail to know this change in time and continue to run, it will further aggravate the heating and oxidation, resulting in a vicious circle, such as the melting and falling off of the contacts, the burning of the contacts, the deterioration of the insulating material, etc., and finally even fires and accidents, which seriously cause Vicious accidents such as switch explosion.

At present, the temperature rise of the main circuit is directly or indirectly detected mainly through the following methods: color-changing film, infrared imaging and temperature measurement technology, temperature measurement by embedding temperature sensors through metal wires, and optical fiber temperature measurement. For a long time, since the main circuit of the circuit breaker (mainly the contact arm and the contact) has been in a high potential environment, it is generally impossible to solve various problems such as high voltage insulation and electrical isolation under high and low potential under direct measurement conditions, making the main circuit of the circuit breaker On-line monitoring of temperature has always been a difficult problem.

With the advancement of technology, some products that measure the temperature of the main circuit of circuit breakers have appeared on the market, but there are still some disadvantages, such as:

1. It is only a single measurement of the temperature, and it is impossible to know the change of the current passing through the contact arm in real time, and it is impossible to actually reflect the relationship between the temperature rise and the current magnitude, and to track and judge and analyze;

2. The obtained data can only be displayed on the display screen of the low-voltage room of the switch cabinet. In some remote areas, due to the limited network cannot reach, the temperature data cannot be transmitted to the remote control center in time, and the maintenance personnel cannot timely understand the location of the switch. The temperature of the main circuit of the circuit breaker inside the cabinet changes, which causes the problem of inconvenient control and maintenance;

3. For the short-distance wireless temperature measurement products used in electric power on the market, the wireless signal is easily affected by the electromagnetic interference generated during the operation of the circuit breaker, especially during the voltage fluctuation and the closing and opening process of the circuit breaker. At the same time, its emission distance and rate are too low to synchronize with the temperature rise of the main circuit of the circuit breaker in time.

In view of this, the inventor made in-depth research on the above-mentioned defects in the existing circuit breaker on-line monitoring technology, and thus came up with this case.

Utility model content

The first purpose of the utility model is to provide a circuit breaker intelligent temperature measuring current measuring arm, which can measure the temperature and current of the main circuit of the circuit breaker under the high voltage environment, so as to solve the problem that the temperature can only be measured in a single way in the prior art. Measurements have the problem of imprecise monitoring information.

In order to achieve the above object, the solution of the present utility model is:

An intelligent temperature-measuring and current-measuring contact arm for a circuit breaker, including a contact arm body, wherein the intelligent temperature-measuring and current-measuring contact arm also includes an induction power-taking module, a temperature sensor, a current measuring coil, a signal conditioning module, a data processing module, and a first A wireless communication module, the inductive power-taking module senses and obtains current and provides power; the temperature sensor is embedded in the contact arm body to detect the temperature of the contact area between the contact arm and the contact; the current measurement coil is nested on the contact arm body and measure the current passing through the contact arm; the current measuring coil is connected to the data processing module through the signal conditioning module, the temperature sensor is connected to the data processing module, and the data processing module is also connected to the first wireless communication module.

Further, the current measuring coil is a Rogowski coil with a measuring range of 0-5000A.

Further, the inductive power-taking module includes a current transformer and a power protection circuit, and the power protection circuit is connected to the current transformer.

Further, the temperature sensor is a digital temperature sensor.

The second purpose of the utility model is to provide an intelligent analysis system for circuit breakers, which can not only realize direct measurement of temperature and current under high voltage, but also realize data transmission, alarm and monitoring.

In order to achieve the above purpose, the circuit breaker intelligent analysis system includes the aforementioned contact arm for temperature measurement and current measurement and a wireless terminal located outside the circuit breaker.

The wireless terminal includes a second wireless communication module, a data processing unit, a data storage unit, a man-machine interface, and an alarm output unit, and the data processing unit is connected to the second wireless communication module, the data storage unit, the man-machine interface, and the alarm output unit. The second wireless communication module communicates with at least one first wireless communication module and transmits the obtained temperature data and current data to the data processing unit.

Further, the circuit breaker intelligent analysis system also includes a central analysis station, the wireless terminal also includes a data forwarding unit connected to the data processing unit, and the data forwarding unit is also provided with a communication interface that can communicate with the central analysis station.

Further, the communication interface includes RS-232, RS485, USB, Ethernet and mobile data network.

Further, the central analysis station adopts a SCADA system, and the SCADA system has a visual monitoring interface in the form of a Web.

After adopting the above structure, the utility model relates to a circuit breaker intelligent temperature measuring current measuring contact arm and its analysis system, which at least has the following functions:

1. The inductive power-taking module can obtain power by itself and supply it to the temperature sensor and the first wireless communication module, so that the intelligent temperature-measuring and current-measuring contact arm can realize self-power supply, avoiding the impact on the battery work under high temperature and high pressure conditions, And has the effect of being able to work for a long time;

2. The temperature sensor obtains temperature data, and the current measuring coil obtains current data, which is processed by the data processing module and then transmitted by the first wireless communication module. Due to the use of wireless communication, it can avoid the high and low voltage side of the circuit breaker. The corresponding problems caused by the high voltage difference between them have the effect of accurate measurement;

3. After the wireless terminal receives and processes the temperature data and current data, it will display the corresponding data on the man-machine interface for the management personnel to view, and at the same time store the data to become historical data; in addition, the data processing unit will also according to The operating state of the circuit breaker is comprehensively judged by the magnitude of the contact arm current and the temperature rise, and if there is an abnormality, the alarm output unit sends out an alarm signal.

Description of drawings

Fig. 1 is a structural block diagram of a preferred embodiment of the utility model related to a circuit breaker intelligent temperature measurement and current measurement contact arm;

Fig. 2 is a block diagram of the internal structure of the induction power-taking module in Fig. 1;

Fig. 3 is a structural schematic diagram of a circuit breaker intelligent analysis system related to the utility model;

FIG. 4 is a structural block diagram of the wireless terminal in FIG. 3 .

In the picture:

Intelligent analysis system 100

Temperature measuring current contact arm 10

Inductive Power Pickup Module 11 Current Transformer 111

Power Protection Circuit 112 Temperature Sensor 12

Current Measurement Coil 13 Signal Conditioning Module 14

Data processing module 15 The first wireless communication module 16

Wireless terminal 20 Second wireless communication module 21

Data processing unit 22 Data storage unit 23

Man-machine interface 24 Alarm output unit 25

Data forwarding unit 26

Central Analysis Station 30.

Detailed ways

In order to further explain the technical solution of the utility model, the utility model is described in detail through specific examples below.

As shown in Figure 1, it shows a contact arm 10 for intelligent temperature measurement and current measurement of a circuit breaker related to the utility model, including a contact arm body (not shown in the figure), an induction power-taking module 11, and a temperature sensor 12 , a current measuring coil 13 , a signal conditioning module 14 , a data processing module 15 and a first wireless communication module 16 .

The inductive power-taking module 11 senses and acquires current and supplies it to other components of the intelligent temperature-measuring-current contact arm 10, such as specifically supplying it to the temperature sensor 12, the data processing module 15, and the first wireless communication module 16; specifically, as shown in FIG. 2 As shown, the inductive power taking module 11 includes a current transformer 111 and a power protection circuit 112, the power protection circuit 112 is connected to the current transformer 111; the power protection circuit 112 is used to prevent and suppress surges such as overvoltage and overcurrent Phenomenon; through the induction power-taking module 11, the intelligent temperature measurement and current measurement contact arm 10 involved in the utility model can realize self-supply power supply, avoiding the impact on the battery work under high temperature and high pressure conditions, and solving the problem of electronic circuit under high voltage conditions. The problem of independent power supply has the effect of being able to work for a long time.

The temperature sensor 12 is embedded in the body of the contact arm, so as to detect the temperature of the contact area between the contact arm and the contact head; specifically, the temperature sensor 12 is preferably a digital temperature sensor 12, thereby saving a large number of peripheral circuits, which is very convenient. The circuit board space is greatly reduced, and the output of the digital signal also avoids the interference of high temperature and electromagnetic interference on the direct collection and measurement of the analog temperature signal when the circuit breaker is in normal operation; the temperature sensor 12 is directly connected with the data processing module 15, and The obtained temperature data is transmitted to the data processing module 15 for processing.

The current measurement coil 13 is nested on the body of the contact arm to measure the current passing through the contact arm; specifically, the current measurement coil 13 is a Rogowski coil with a measurement range of 0-5000A; the current measurement coil 13 passes through the signal conditioning module 14 After the front end is processed, it is connected to the data processing module 15, and the current data is transmitted to the data processing module 15 for processing;

The first wireless communication module 16 is connected to the data processing module 15, and the temperature data and current data processed by the data processing module 15 are transmitted by wireless transmission; specifically, the first wireless communication module 16 is based on 2.4GHz The first wireless communication module 16 has low transmission power and will not interfere with the operation of other electronic equipment, and it can perform reliable communication when the switchgear is in normal operation. , Therefore, it does not need to use any wired connections such as cables and optical fibers, thereby solving the problem of direct communication between high potential and low potential, and avoiding insulation problems such as creepage, thereby greatly improving the accuracy of measurement.

After the assembly of the entire intelligent temperature-measuring and current-measuring contact arm 10 is completed, the structure of the contact arm body is basically the same as that in the prior art, so its installation method is exactly the same as the existing one, so no detailed description will be given. In addition, the body of the contact arm is also marked with a globally unique ID number, which is beneficial for maintenance and identification.

As shown in FIG. 3 and FIG. 4 , it is an intelligent analysis system 100 for a circuit breaker according to the present invention. The intelligent analysis system 100 includes the aforementioned contact arm 10 for measuring temperature and current and a wireless terminal 20 located outside the circuit breaker. Since the temperature measuring and current measuring arm 10 has been fully described above, the internal structure of the temperature measuring and current measuring arm 10 will not be described again. The wireless terminal 20 and the wireless terminal 20 and the temperature measuring and current measuring arm 10 will be described below. Describe the relationship between them in detail:

As shown in FIG. 4 , the wireless terminal 20 includes a second wireless communication module 21 , a data processing unit 22 , a data storage unit 23 , a man-machine interface 24 and an alarm output unit 25 .

The data processing unit 22 is connected to the second wireless communication module 21, the data storage unit 23, the man-machine interface 24 and the alarm output unit 25, and the second wireless communication module 21 communicates with at least one first wireless communication module 16 and will obtain The temperature data and current data are transmitted to the data processing unit 22 .

The data processing unit 22 processes and compares the temperature data and the current data in real time. On the one hand, it displays the data in real time through the man-machine interface 24, and stores them as historical data through the data storage unit 23; The size of the arm current and the temperature rise are comprehensively judged, and it is judged that there is an abnormal condition in the main circuit of the circuit breaker, and the alarm output unit 25 is used to report to the police. At this time, the management personnel should immediately carry out power outage maintenance.

As shown in Figure 3, the circuit breaker intelligent analysis system 100 also includes a central analysis station 30, and the wireless terminal 20 also includes a data forwarding unit 26 connected to the data processing unit 22, and the data forwarding unit 26 is also configured to communicate with the central analysis station 30 communication interfaces for mutual communication. The data forwarding unit 26 is specifically a communication module. The data forwarding unit 26 supports multiple wired and wireless communication networks. Specifically, the communication interfaces include RS-232, RS485, USB, Ethernet and Mobile data network; the central analysis station 30 adopts a SCADA system, and the data forwarding unit 26 can be embedded with a wireless data communication module, which can transmit encrypted data to a remote data center in real time, thereby solving the problem that some areas do not have wired Ethernet access problem.

The SCADA system has a visual monitoring interface in the form of Web, so that it can realize remote online monitoring of circuit breaker temperature rise and load current, and perform advanced analysis and diagnosis; at the same time, it can manage the wireless terminal 20 and the intelligent temperature measurement and current measurement arm 10 , configuration and software upgrade; in addition, it can also be equipped with client software, which can directly communicate with the wireless terminal 20 for analysis.

The utility model relates to an intelligent temperature-measuring-current contact arm 10 for a circuit breaker and an analysis system thereof, which can also be applied to the field of inductive power-taking, temperature-measuring, and current-measuring fields such as busbars and cables.

The above-mentioned embodiments and drawings do not limit the product form and style of the present utility model, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present utility model.

Claims (8)

1. an isolating switch intelligent temperature measurement is surveyed the electric current contact arm, comprise the contact arm body, it is characterized in that, this intelligent temperature measurement is surveyed the electric current contact arm and is also comprised induction electricity-fetching module, temperature sensor, current measurement coil, signal condition module, data processing module and first wireless communication module, and this induction electricity-fetching module induction is obtained electric current and power supply is provided; This temperature sensor embeds and is arranged in the contact arm body and detects the temperature of contact arm body; This current measurement coil is nested on the contact arm body and measures electric current by contact arm; This current measurement coil links to each other with data processing module by the signal condition module, and this temperature sensor links to each other with data processing module, and this data processing module also links to each other with first wireless communication module.

2. a kind of isolating switch intelligent temperature measurement as claimed in claim 1 is surveyed the electric current contact arm, it is characterized in that this current measurement coil is that measurement range is the Luo-coil of 0-5000A.

3. a kind of isolating switch intelligent temperature measurement as claimed in claim 1 is surveyed the electric current contact arm, it is characterized in that this induction electricity-fetching module comprises current transformer and power protecting circuit, and this power protecting circuit links to each other with current transformer.

4. a kind of isolating switch intelligent temperature measurement as claimed in claim 1 is surveyed the electric current contact arm, it is characterized in that this temperature sensor is the numeric type temperature sensor.

5. an isolating switch intelligent analysis system is characterized in that, comprises the wireless terminal of surveying the electric current contact arm and being positioned at the isolating switch outside as each described thermometric of claim 1 to 4; This wireless terminal comprises second wireless communication module, data processing unit, data storage cell, man-machine interface and warning output unit, this data processing unit all links to each other with second wireless communication module, data storage cell, man-machine interface and warning output unit, and this second wireless communication module is communicated by letter with at least one first wireless communication module and temperature data and the current data that obtains transferred to data processing unit.

6. a kind of isolating switch intelligent analysis system as claimed in claim 5, it is characterized in that, this isolating switch intelligent analysis system also comprises the center analysis station, this wireless terminal also comprises the data forwarding unit that links to each other with data processing unit, and this data forwarding unit also is provided with the communication interface that can intercom mutually with the center analysis station.

7. a kind of isolating switch intelligent analysis system as claimed in claim 6 is characterized in that this communication interface comprises RS-232, RS485, USB, Ethernet and mobile data network.

8. a kind of isolating switch intelligent analysis system as claimed in claim 6 is characterized in that, this center analysis station adopts the SCADA system, and this SCADA system has the visual monitor interface of Web form.

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