CN202189111U

CN202189111U - Wireless temperature measurement system of high voltage switch contacts

Info

Publication number: CN202189111U
Application number: CN2011202954730U
Authority: CN
Inventors: 周根元; 崔联合; 曹立峰
Original assignee: JIANGYIN LEAD ELECTRIC CO Ltd
Current assignee: JIANGSU LIDE INTELLIGENT MONITORING TECHNOLOGY CO., LTD.
Priority date: 2011-08-13
Filing date: 2011-08-13
Publication date: 2012-04-11
Anticipated expiration: 2021-08-13

Abstract

The utility model relates to a wireless temperature measurement system of high voltage switch contacts, comprising a wireless temperature measurement sensor module(1) and a concentrated receiving module(2). The wireless temperature measurement sensor module(1) comprises a temperature measurement sensor(1.1), an A/D module(1.2), a one-chip microcomputer(1.3) and a wireless module(1.4), a temperature signal measured by the temperature measurement sensor(1.1) is send out by the wireless module(1.4) via the A/D module(1.2) and the one-chip microcomputer(1.3), the temperature signal sent by the wireless module(1.4) is received by a wireless receiver(2.2.1) and then is transmitted to a microprocessor 1(2.1.2) via a microprocessor 2(2.2.2), a bus interface circuit 2 (2.2.3) and a bus interface circuit 1(2.1.3), and the microprocessor 1(2.1.2) realizes an external communication by connecting with an interface circuit(2.1.1) on the microprocessor 1(2.1.2). The wireless temperature measurement system of the high voltage switch contacts of the utility model is simple in structure, high in measurement precision and high in transmission efficiency.

Description

High-voltage switch gear contact wireless temperature measurement system

Technical field

The utility model relates to a kind of temp measuring system, especially relates to a kind of temp measuring system based on wireless technology, is used to be installed in place, high-voltage switch gear contact it is carried out real-time temperature detection.

Background technology

High-tension switch cabinet is the visual plant in generating plant, the transformer station, plays a part to open and turn-off power supply, is used for realizing conveying and conversion electric load and from electric system, withdraws from faulty equipment and line segment, thereby guarantee safe operation of power system.High-tension switch cabinet is in the long-time running process, and positions such as contact point in the switch cubicle and bus (busbar) junction are no matter be the loosening or aging increase that all can cause contact resistance; Thereby cause that heating power is higher here, cause heating of contact, and temperature raises and can quicken the oxidation of surface of contact metal; Thereby further increase contact resistance, so just formed a vicious cycle, occur rapid rising of local temperature easily and cause contact fusing; Open circuit thereby cause, cause large-area power-cuts.In recent years, in power plant and transformer station a lot of switch cubicle overheat accidents having taken place, causes fire and large-area power outage, thereby influence the operate as normal of whole electric system, even bring about great losses.

Therefore real-time online detects the working temperature of contact, bus junction in the high-tension switch cabinet; Find in advance and get rid of hot stall hidden danger; Oneself becomes electrical equipment safe operation in the electric system and is badly in need of the practical problems that solves, and the safe and reliable operation of electric system is had very important significance.

At present, the method for on-line monitoring has following several kinds

(1) infrared radiation sensor

Infrared temperature-test technology is meant and uses infrared radiation sensor to come the temperature of measuring contacts, is a kind of non-contact measuring technology.Infrared radiation sensor commonly used mainly is pyroelectric infrared sensor and thermopile sensor; The responsive to temperature of pyroelectric infrared sensor to changing; Because research object is the contact in the high-tension switch cabinet; The space is narrow and small in the switch cubicle, is difficult to install other optics backup systems, thus pyroelectric infrared sensor be inapplicable.And the output voltage of thermopile sensor is merely hundreds of microvolt to tens millivolt; Signal is too faint; For preventing to be flooded by electromagnetic signal in the high-tension switch cabinet, handle again after will amplifying signal during actual measurement, in use also need add a temperature sensor and measure cold junction temperature; Cause textural anomaly complicated, and increased use cost;

(2) fiber-optic grating sensor

Fiber grating is a kind of diffraction grating that the refractive index axial cyclic modulation of fiber core is formed through certain method, is a kind of passive filter device.Can be divided into short period fiber grating and LPFG by cycle length.The short period fiber grating is called Fiber Bragg Grating FBG (FBG) again, and its cycle is less than 1um; The LPFG cycle is tens to the hundreds of micron, claims transmission grating again.But the resonance wavelength of LPFG and the amplitude variation of environment to external world are very responsive, and for the narrow and small occasion in these spaces in the high-tension switch cabinet, error is bigger, is not suitable for using;

The FBG basic principle of measurement is that the centre wavelength of FBG always changes along with the variation of ambient temperature.But because fiber grating is responsive equally to its suffered longitudinal strain; So must select one to make it neither receive extensional vibration when installing; The position of as close as possible testee again, thereby limited its versatility, and also optical fiber is not still reaching requirement aspect the high pressure isolation; Particularly when dust or humidity were arranged, high pressure can pass through the optical fiber creeping discharge;

(3) infrared IrDA signal transmission

Adopt infrared light to come transmission signals in order to realize the reliable isolation under the high pressure; Detection module is installed near the contact; Sensor is converted into simulating signal with temperature signal, after A/D transforms, by single-chip microcomputer this digital signal is launched through infrarede emitting diode, and the signal of emission is modulated through the carrier signal of 37.9kHz; The receiving trap that is installed on the switch cubicle receives this signal, demodulates the temperature digital signal.At present, adopt point-to-point pattern basically; Infrared signal has good anti-electromagnetic interference capability, and IrDA communication protocol has guaranteed 0-l rice, the zero defect in the 0-15 degree axis runout angular region, but the transmission of signal has angle limits.

The purpose of the utility model is to overcome above-mentioned deficiency, and a kind of simple in structure, measuring accuracy is high, transfer efficiency is high high-voltage switch gear contact wireless temperature measurement system is provided.

The purpose of the utility model is achieved in that a kind of high-voltage switch gear contact wireless temperature measurement system; Said system includes wireless temperature measurement sensor assembly and concentrated receiver module; Said wireless temperature measurement sensor assembly includes temperature probe, A/D module, single-chip microcomputer and wireless module; The temperature signal that said temperature probe records is sent by wireless module behind A/D module and single-chip microcomputer; Said concentrated receiver module includes gateway module and receiver module; Said gateway module includes interface circuit, microprocessor one and bus interface circuit one; Said receiver module includes wireless receiver, microprocessor two and bus interface circuit two, and the temperature signal that is sent by wireless module receives through wireless receiver after transfer to microprocessor one by microprocessor two, bus interface circuit two and bus interface circuit one, and said microprocessor one is realized external communication through the interface circuit that connects on it.

The utility model high-voltage switch gear contact wireless temperature measurement system, said interface circuit are at least a in ethernet interface circuit and the RS485 interface circuit.

Compared with prior art, the beneficial effect of the utility model is:

The utility model adopts the mode of radio communication that real-time detection is carried out in the high-voltage switch gear contact in the switch cubicle, and is simple in structure, and temperature sensor does not receive the influence of small space in the cabinet, thereby measuring accuracy is high; Simultaneously, utilize ripe wireless transmission method, transfer efficiency is high, and the signal transmission is guaranteed; And the utility model can detect applied range to 96 contact points simultaneously in real time.

Description of drawings

Fig. 1 is the circuit block diagram of the utility model high-voltage switch gear contact wireless temperature measurement system.

Fig. 2 is the circuit block diagram of the utility model wireless temperature measurement sensor assembly.

Fig. 3 concentrates the circuit block diagram of receiver module for the utility model.

Wherein:

Wireless temperature measurement sensor assembly 1, concentrated receiver module 2, server 3;

Temperature probe 1.1, A/D module 1.2, single-chip microcomputer 1.3, wireless module 1.4;

Gateway module 2.1, interface circuit 2.1.1, microprocessor one 2.1.2, bus interface circuit one 2.1.3;

Receiver module 2.2, wireless receiver 2.2.1, microprocessor two 2.2.2, bus interface circuit two 2.2.3.

Embodiment

Referring to Fig. 1 ~ 3; A kind of high-voltage switch gear contact wireless temperature measurement system that the utility model relates to; Said system includes wireless temperature measurement sensor assembly 1, concentrates receiver module 2 and server 3; Said wireless temperature measurement sensor assembly 1 includes temperature probe 1.1, A/D module 1.2, single-chip microcomputer 1.3 and wireless module 1.4; The temperature signal that said temperature probe 1.1 records is sent by wireless module 1.4 behind A/D module 1.2 and single-chip microcomputer 1.3; Said concentrated receiver module 2 includes gateway module 2.1 and receiver module 2.2; Said gateway module 2.1 includes interface circuit 2.1.1, microprocessor one 2.1.2 and bus interface circuit one 2.1.3; Said receiver module 2.2 includes wireless receiver 2.2.1, microprocessor two 2.2.2 and bus interface circuit two 2.2.3; The temperature signal that is sent by wireless module 1.4 receives through wireless receiver 2.2.1 after transfer to microprocessor one 2.1.2 by microprocessor two 2.2.2, bus interface circuit two 2.2.3 and bus interface circuit one 2.1.3, and said microprocessor one 2.1.2 sends to server 3 with signal interface circuit 2.1.1, and server 3 can write down, analyze and report to the police temperature data; Also can be connected with display circuit, key circuit, storer and relay output circuit etc. on microprocessor one 2.1.2, the relay output circuit is used to control alarm or fan.

During use; Said interface circuit 2.1.1 can be ethernet interface circuit or RS485 interface circuit; Receiver module 2.2 is provided with 8 at most, and it all can realize communication through bus interface circuit two 2.2.3 and gateway module 2.1, and each receiver module 2.2 all can receive the temperature signal that 12 wireless temperature measurement sensor assemblies 1 send; Therefore, the utility model high-voltage switch gear contact wireless temperature measurement system can detect the temperature of 8 * 12=96 contact point simultaneously.

Claims

1. high-voltage switch gear contact wireless temperature measurement system; It is characterized in that: said system includes wireless temperature measurement sensor assembly (1) and concentrated receiver module (2); Said wireless temperature measurement sensor assembly (1) includes temperature probe (1.1), A/D module (1.2), single-chip microcomputer (1.3) and wireless module (1.4); The temperature signal that said temperature probe (1.1) records is sent by wireless module (1.4) behind A/D module (1.2) and single-chip microcomputer (1.3); Said concentrated receiver module (2) includes gateway module (2.1) and receiver module (2.2); Said gateway module (2.1) includes interface circuit (2.1.1), microprocessor one (2.1.2) and bus interface circuit one (2.1.3); Said receiver module (2.2) includes wireless receiver (2.2.1), microprocessor two (2.2.2) and bus interface circuit two (2.2.3); The temperature signal that is sent by wireless module (1.4) receives through wireless receiver (2.2.1) after transfer to microprocessor one (2.1.2) by microprocessor two (2.2.2), bus interface circuit two (2.2.3) and bus interface circuit one (2.1.3), and said microprocessor one (2.1.2) is realized external communication through connection interface circuit (2.1.1) on it.

2. a kind of according to claim 1 high-voltage switch gear contact wireless temperature measurement system is characterized in that: at least a in ethernet interface circuit and the RS485 interface circuit of said interface circuit (2.1.1).