CN210689826U

CN210689826U - Intelligent digital temperature measuring device for generator stator

Info

Publication number: CN210689826U
Application number: CN201921769819.9U
Authority: CN
Inventors: 朱玉良
Original assignee: Zhejiang Electric Power Research Monitor Technology Co ltd
Current assignee: Zhejiang Electric Power Research Monitor Technology Co ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-06-05
Anticipated expiration: 2029-10-22

Abstract

The utility model relates to a digital temperature measuring device of generator stator intelligence, including digital temperature sensor, signal cable, controller and host computer, characteristics are: the digital temperature sensor is regularly bonded on the outer wall of the circumference of the stator of the generator and is connected with the signal cable through the cable connector and the three-way connector, the signal cable supplies power for the sensor and transmits the measurement data of the sensor to the controller, and the controller collects and stores the signals and transmits the signals to the upper computer for analysis and diagnosis. The utility model discloses a digital temperature sensor replaces the thermal resistance to carry out temperature detection, uses the controller to gather and the analysis and diagnosis data, has advantages such as anti-electromagnetic interference, precision height, cable laying are simple, multiple spot temperature measurement, internet data transmission, helps guaranteeing large-scale hydraulic generator's safe operation.

Description

Intelligent digital temperature measuring device for generator stator

Technical Field

The utility model belongs to the technical field of the temperature monitoring, concretely relates to generator stator intelligence digit temperature measuring device.

Background

The hydraulic generator is an important device for generating electric energy in a hydropower station, and along with the implementation of the national policy of energy conservation and emission reduction, the hydropower industry enters a high-speed development stage, and the hydraulic generator is continuously developed towards the direction of high capacity and high rotation speed. The running temperature of the unit is an important index for measuring the running condition of the hydraulic generator, and how to accurately monitor the running temperature of the key components for a long time is always the key point of monitoring work. At present, the temperature measurement of a generator stator usually adopts RTD temperature measurement resistors, but the method has obvious defects, such as easy electromagnetic interference, poor stability and reliability and the like, and because the stator is huge in volume, a large number of RTD temperature measurement cables need to be laid to meet the use requirement, and a detection channel of a rear-end instrument cannot meet the simultaneous detection of a plurality of cables.

The prior art aims at the problem that the temperature measurement of a thermal resistor is easy to be interfered by electromagnetic, and improves the temperature measurement method of a generator, for example, in Chinese patent with application publication number of CN108955941A, the application publication number of 2018, 12 and 7, the application publication number of CN108955941A, the system comprises a power station background control system, a unit state monitoring screen, a stator system signal regulator, a stator optical fiber probe, a rotor system signal regulator, a rotor optical fiber probe, a rotor slip ring, an industrial personal computer, a relay device, a communication conversion module, a photoelectric conversion module, a wireless transmitter, a wireless receiver, a wireless transmitter power supply, a wireless receiver power supply, a VGA transmitter and a VGA receiver, the optical fiber probe replaces the thermal resistor to detect the temperature, the system has the advantages of electromagnetic interference resistance, high sensitivity, high precision and the like, but does not solve the problem that the cable laying is complicated, insufficient number of measuring points and the like.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a generator stator intelligence digital temperature measuring device of anti-electromagnetic interference, sensitivity height, precision height, cable laying simple, multiple spot temperature measurement, internet data transmission.

The utility model provides a technical scheme that above-mentioned problem adopted is: this digital temperature measuring device of generator stator intelligence, including digital temperature sensor, signal cable, controller and state monitoring analysis fault diagnostic, its characterized in that: digital temperature sensor, signal cable, controller and host computer, its characterized in that: the digital temperature sensor comprises a sensor part, a short-circuit wire and a cable connector, wherein the sensor part consists of a square shell and an internal chip, the sensor part is adhered to the upper part, the middle part and the lower part of the outer side of the circumference of the generator stator through epoxy resin adhesive coated on the square shell to form 3 rows of temperature measurement groups which are horizontally arranged at equal intervals, the number of the signal cables is 3, the signal cables are horizontally wound and fixed at the upper part, the middle part and the lower part of the outer side of the circumference of the generator stator, the signal cable is connected with the cable connector of the digital temperature sensor of the adjacent temperature measuring group through a T-shaped three-way connector, one end of the signal cable is sealed, the other end of the signal cable is connected with the controller, the controller is located in an electronic room controlled by the power plant unit, and the controller is connected with the upper computer through an RS485 bus interface. The epoxy resin adhesive has high bonding strength, good heat resistance, high heat conductivity coefficient and small influence on the measurement data of the temperature sensor, the temperature sensor is connected in parallel on the signal cable through the cable joint and the T-shaped three-way connector, the problem that all sensors cannot work normally when a certain sensor breaks down can be avoided, the disassembly and replacement of the sensor are convenient, the wiring process of bus wiring is simple, convenient and flexible, the circuit has the advantages of simple structure, low cost, convenience for main line expansion and maintenance and the like, the digital temperature sensors are distributed at each position of the circumferential outer wall of the stator, the stator is subjected to omnibearing temperature monitoring, fault points can be found out at the first time, each signal cable can be connected with 1-100 digital temperature sensors, the controller is responsible for signal acquisition, storage and data processing, and data after primary processing are transmitted to the upper computer.

Preferably, the digital temperature sensor of the present invention is configured to directly transmit the measured temperature value in a digital manner of "single bus" during operation. The digital transmission mode of the single bus not only transmits clock signals, but also transmits data signals, and the data transmission is bidirectional, so that the anti-interference capability of the system can be improved.

Preferably, the digital temperature sensor of the present invention is a DS18B20 sensor, which mainly comprises four parts, namely a temperature sensor, a 64-bit ROM, non-volatile temperature alarm triggers TH and TL, and a configuration register, wherein each digital temperature sensor has a unique 64-bit serial number. The chips at each position of the bus are identified through the serial number and the corresponding addresses are recorded, so that a plurality of digital temperature sensors are allowed to be simultaneously connected to a single-wire bus, and a processor can be conveniently used for controlling a plurality of chips distributed in different areas.

Preferably, the square shell of the digital temperature sensor of the utility model is divided into two types of high heat conduction ceramic shell and surface nickel-plated copper shell. The high-thermal-conductivity ceramic and the copper both have high thermal conductivity, high heat resistance and low dielectric constant, the manufacturing cost of the high-thermal-conductivity ceramic shell is higher than that of a nickel-plated copper shell, but when current exists on the surface of a measurement object, the copper shell can interfere with measurement data of a sensor, so that the copper shell with the nickel-plated surface is usually selected to save cost when the high-thermal-conductivity ceramic shell is used in places without current, and the high-thermal-conductivity ceramic shell is usually selected to ensure that the measurement result is accurate and reliable when the high-thermal-conductivity ceramic shell is used in places with current.

Preferably, the digital temperature sensor of the present invention is powered by a signal cable, the signal cable is a three-wire system, wherein a wire connected to VCC or GND serves as a power supply of the digital temperature sensor, and a wire connected to DQn serves as a signal path of the digital temperature sensor. N in the DQn is variable, the numerical value of the variable is the same as the serial number of the digital temperature sensor and corresponds to the serial number one by one, and the digital temperature sensor does not need to be additionally connected with a power supply, so that the device has simpler structure and higher reliability.

Preferably, the utility model discloses a signal cable's outside cladding has the polypropylene hose. The polypropylene hose has high heat resistance and is used for protecting the signal cable.

As preferred, the utility model discloses a RS485 bus interface adopts industry general standard MODBUS-RTU agreement. The MODBUS-RTU protocol is a general language applied to an electronic controller, and through the protocol, controllers can communicate with each other and with equipment through a network, so that the MODBUS-RTU protocol is conveniently combined with various configuration software, a temperature measuring system is quickly established, and centralized monitoring is realized.

As preferred, the utility model discloses a controller has sensor search function and real-time read-in data function for independently developing the long-range digital temperature acquisition equipment of TN-100 strong driving force. TN-100 can automatically recognize the 64-bit serial number of the digital temperature sensor, and the measured temperature data is corresponding to the sensors one by one.

Preferably, the controller of the present invention has a unique address, and the address is changed by the dial switch. In practical application, a plurality of machines are sometimes required to be networked for use, addresses of all controllers cannot be the same during networking, and at the moment, the addresses of the controllers need to be modified by using dial switches.

As preferred, the utility model discloses a host computer includes host computer hardware and host computer software, host computer software shows every digital temperature sensor's temperature numerical value with the chart form in real time to fix a position every digital temperature sensor's mounted position, monitor digital temperature sensor's operating condition. The main functions of the upper computer software comprise reading the serial number of a single sensor to a software configuration library, writing the serial number of the single sensor into a specified channel, writing the serial numbers of a plurality of sensors into a specified temperature chain and monitoring the temperature in real time, so that engineers and experts can conveniently analyze and diagnose related signals.

Compared with the prior art, the utility model, have following advantage and effect:

(1) the wiring is simple, and the maintenance is convenient. The utility model discloses a bus type wiring method is equipped with 3 signal cable, and each digital temperature sensor passes through cable connector and T type tee bend connector and connects in parallel on signal cable, and not only the installation of sensor is simple, convenient with the change process, and whole circuit has simple structure, with low costs, the mainline of being convenient for advantage such as extension and maintenance moreover.

(2) And (6) multipoint temperature measurement. The digital temperature sensor is adopted to replace a thermal resistor for temperature detection, signal transmission is carried out in a single-bus digital transmission mode, a large number of cables do not need to be laid, and the digital temperature sensor is distributed at each part of the circumferential outer wall of the generator stator, so that multipoint and all-dimensional temperature monitoring is realized.

(3) The measurement precision is high. The utility model discloses a digital temperature sensor is supplied power by signal cable, and job stabilization is reliable, and the interference killing feature is strong to bond with high coefficient of thermal conductivity's epoxy glue, reduce the influence of junction to measuring result, make measuring result have higher precision.

Drawings

In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a digital temperature sensor according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an internal structure of a sensor portion according to an embodiment of the present invention.

Fig. 4 is a schematic connection diagram of a cable connector and a three-way connector according to an embodiment of the present invention.

Fig. 5 is a schematic view of the installation of the digital temperature sensor and the signal cable according to the embodiment of the present invention.

Description of reference numerals: 1. a digital temperature sensor; 2. a signal cable; 3. a controller; 4. an upper computer; 5. a generator stator; 6. a sensor portion; 7. a short-circuit wire; 8. a cable joint; 9. a square housing; 10. an internal chip; 11. three-way connector.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

Referring to fig. 1 to 5, the intelligent digital temperature measuring device for the generator stator of the present embodiment includes a digital temperature sensor 1, a signal cable 2, a controller 3, and an upper computer 4.

The digital temperature sensor 1 of the embodiment is a DS18B20 sensor, which mainly comprises four parts, namely a temperature sensor, a 64-bit ROM, non-volatile temperature alarm triggers TH and TI, and a configuration register, wherein each digital temperature sensor 1 has a globally unique 64-bit serial number, each chip is distinguished by the serial number to realize signal tracking, the digital temperature sensor 1 comprises a sensor part 6, a short connection wire 7 and a cable connector 8, the sensor part 6 comprises a square shell 9 and an internal chip 10, the square shell 9 is made of high thermal conductivity ceramic and copper nickel plating, when applied in a current-free environment, the copper nickel plating material with low cost is usually selected, when applied in a current environment, the high thermal conductivity ceramic material without current interference is usually selected to ensure the accuracy of the measurement result, the material of the short connection wire 7 is the same as that of the signal cable 2, the cable connector 8 is a standard M12 connector and has good interchangeability, the digital temperature sensor 1 is connected with the T-shaped three-way connector 11 on the signal cable 2 through the cable connector 8, and all sensors are connected to the signal cable 2 in parallel, so that the problem that all sensors cannot work normally when a certain sensor fails can be avoided, and the disassembly and replacement work of the sensors is greatly simplified.

The quantity of digital temperature sensor 1 of this embodiment is 105, 3 equalling divide into, through coating the epoxy glue on the square shell 9 of sensor and paste the upper portion, middle part and the lower part position at generator stator 5 outer wall, the adhesive strength of epoxy glue is high, the heat resistance is good, the coefficient of heat conductivity is high, it is little to the measured data influence of temperature sensor, the mounting height and the installation interval of the sensor of same row are the same, and all adopt the bus type wiring mode to be connected with adjacent signal cable 2. The number of the signal cables 2 is 3, the signal cables 2 are horizontally wound and fixed on the outer side of the circumference of the stator 5 of the generator, the signal cables 2 are protected by a high-temperature-resistant polypropylene hose outside the signal cables 2, the signal cables 2 are in a three-wire system, wherein the signal cables 2 are connected with VCC (voltage converter), GND (ground) of the internal chip 10 as a power supply of the digital temperature sensor 1, the signal cables connected with DQn as a signal channel of the digital temperature sensor 1, and the tail ends of the signal cables 2 are connected with the controller 3. The sensor is powered by the signal cable 2, so that the circuit structure is simplified, the reliability of the device is improved, and temperature data measured by the sensor is transmitted to the controller 3 for processing through the DQn signal channel.

The controller 3 of the embodiment is a TN-100 strong-driving-capability remote digital temperature acquisition device independently developed by enterprises, and has a sensor search function and a real-time data reading function. The controller 3 is located in an electronic room of the power plant unit main control, is mainly responsible for signal acquisition, storage and data processing, can automatically identify 64-bit serial numbers of the digital temperature sensors, and corresponds measured temperature data to the sensors one by one. Furthermore, the method is simple. The controller 3 also has a unique address which can be changed by a dial switch, when the multi-machine networking is used, the addresses of all the controllers cannot be the same, and at the moment, the dial switch is required to be used for modifying the address of the controller 3, so that the data disorder is prevented.

The controller 3 of this embodiment is connected with the host computer 4 through the RS485 bus interface, and the RS485 bus interface adopts industry general standard MODBUS-RTU agreement, and this agreement is a universal language who is applied to on the electronic controller, and through this agreement, the controller 3 can communicate between each other, controller 3 via network and the equipment, conveniently with various configuration software combination, has good suitability.

The upper computer of this embodiment includes upper computer hardware and upper computer software, the upper computer software has four main functions of reading the serial number of a single digital temperature sensor 1 to the software configuration library, writing the serial number of a single digital temperature sensor 1 to a specified channel, writing the serial numbers of a plurality of digital temperature sensors 1 to a specified temperature chain and monitoring the temperature in real time, can display the temperature value of each digital temperature sensor 1 in a graph form in real time, and position the installation position of each digital temperature sensor 1 and monitor the operating condition of the digital temperature sensor 1, thereby facilitating the analysis and diagnosis work of relevant signals by engineers and experts.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a digital temperature measuring device of generator stator intelligence, includes digital temperature sensor (1), signal cable (2), controller (3) and host computer (4), its characterized in that: the digital temperature sensor (1) comprises a sensor part (6), a short-circuit wire (7) and a cable connector (8), wherein the sensor part (6) consists of a square shell (9) and an internal chip (10), the sensor part (6) is adhered to the upper part, the middle part and the lower part of the outer side of the circumference of the generator stator (5) through epoxy resin adhesive coated on the square shell (9) to form 3 rows of temperature measurement groups which are horizontally arranged at equal intervals, the number of the signal cables (2) is 3, the signal cables (2) are horizontally wound and fixed to the upper part, the middle part and the lower part of the outer side of the circumference of the generator stator (5), the signal cables (2) are connected with the cable connector (8) of the digital temperature sensor (1) of the adjacent temperature measurement group through a T-shaped three-way connector (11), one end of the signal cables (2) is sealed, the other end is connected with controller (3), controller (3) are arranged in the electron room of power plant unit master control, controller (3) are connected with host computer (4) through RS485 bus interface.

2. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: when the digital temperature sensor (1) works, the measured temperature value is directly transmitted in a single-bus digital mode.

3. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: the digital temperature sensor (1) is a DS18B20 sensor and mainly comprises a temperature sensor, a 64-bit ROM, non-volatile temperature alarm triggers TH and TL and a configuration register, wherein each digital temperature sensor (1) has a unique 64-bit serial number.

4. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: the square shell (9) is divided into a high-heat-conductivity ceramic shell and a copper shell with nickel plated on the surface.

5. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: the digital temperature sensor (1) is powered by a signal cable (2), the signal cable (2) adopts a three-wire system, wherein a wire connected with VCC and GND is used as a power supply of the digital temperature sensor (1), and a wire connected with DQn is used as a signal channel of the digital temperature sensor (1).

6. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: the signal cable (2) is externally coated with a polypropylene hose.

7. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: and the RS485 bus interface adopts an industrial universal standard MODBUS-RTU protocol.

8. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: the controller (3) is TN-100 high-driving-capacity remote digital temperature acquisition equipment and has a sensor searching function and a real-time data reading function.

9. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: the controller (3) has a unique address, and the address is changed by a dial switch.

10. The intelligent digital temperature measuring device for the generator stator according to claim 1, characterized in that: the upper computer comprises upper computer hardware and upper computer software, the upper computer software displays the temperature value of each digital temperature sensor (1) in a chart form in real time, positions the installation position of each digital temperature sensor (1), and monitors the working state of the digital temperature sensors (1).