CN201903491U

CN201903491U - Micro-water density online monitoring instrument for high-voltage electric power equipment

Info

Publication number: CN201903491U
Application number: CN2010206557603U
Authority: CN
Inventors: 顾理强
Original assignee: SHANGHAI RICH ELECTRONIC ENGINEERING TECHNOLOGY Co Ltd
Current assignee: SHANGHAI RICH ELECTRONIC ENGINEERING TECHNOLOGY Co Ltd
Priority date: 2010-12-13
Filing date: 2010-12-13
Publication date: 2011-07-20
Anticipated expiration: 2020-12-13

Abstract

The utility model discloses a micro-water density online monitoring instrument for a high-voltage electric power equipment, which comprises a humidity sensor, a pressure sensor, a temperature sensor, a normalized filter processing circuit device, a protective cover and a separate type outlet box, wherein the humidity sensor, the pressure sensor, the temperature sensor and the normalized filter processing circuit device are installed on a valve body; the output ends of the humidity sensor, the pressure sensor and the temperature sensor are connected with the normalized filter processing circuit device respectively; the output end of the normalized filter processing circuit device is connected with the public end of the separate type outlet box; the protective cover is connected with the valve body through a connecting piece; and the separate type outlet box is installed on the protective cover through a connecting piece. The micro-water density online monitoring instrument has the advantages of compact structure, reasonable design, and conveniences in installation and use, and can accurately and stably test the moisture content, the density, the temperature and other parameters of insulating gas in the high-voltage electric power equipment.

Description

The little water-mass density on-line monitoring of high voltage electric power equip ment instrument

Technical field

The utility model relates to a kind of monitoring instrument, more particularly, is to be applied in the high voltage electric power equip ment on-line monitoring instrument that water cut and density to insulating gas detect.

Background technology

SF6 (sulfur hexafluoride) has good insulation performance performance and arc extinction performance, and present stage is widely used in the high voltage electric equipment, under nominal situation, is comparatively desirable insulation and arc-extinguishing medium.The crux that influences SF6 gas-insulated and arc extinction performance is the height of moisture and gas density in its working gas, if moisture exceeds standard or leaks and causes density to descend in the SF6 gas, just there is potential safety hazard in high voltage electric equipment even causes accident to take place.Therefore the monitoring to SF6 gas moisture and density in the high voltage electric equipment is the important component part of power industry safety always.

For the moisture and the gas density of monitoring SF6 gas in the high voltage electric power equip ment, the mode that transmission or single transmitter transmit after main at present employing humidity, pressure, the temperature transmitter simple combination, disturbed by high-frequency signal, data transmit unstable; Because power equipment is installed in outdoor mostly, can produce very big vibrations during equipment operation, therefore the water, shock of monitoring instrument requires the instrument performance influence most important, the most direct array modes of transmitter that adopt of little in the market water-mass density monitor, transfer circuit does not have the setting of corresponding antidetonation waterproof, and is not good to shockproof waterproof effect.

Summary of the invention

Because the problems referred to above that prior art exists, the purpose of this utility model are the little water-mass density on-line monitoring of the high voltage electric power equip ment instruments that proposes a kind of novel anti electromagnetic interference (EMI), stable conveying, antidetonation waterproof, it can effectively solve the problems referred to above that prior art exists.

For achieving the above object; the utility model proposes the little water-mass density on-line monitoring of a kind of high voltage electric power equip ment instrument; comprise the humidity sensor that is installed on the valve body; pressure transducer; temperature sensor and normalization Filtering Processing circuit arrangement and an over cap and separate type outlet box; described humidity sensor; pressure transducer; the output terminal of temperature sensor links to each other with described normalization Filtering Processing circuit arrangement respectively; this normalization Filtering Processing circuit arrangement output terminal is connected with the male end of described separate type outlet box; and described over cap links to each other by web member with valve body, and described separate type outlet box is installed on the over cap by web member.

As further feature of the present utility model, described normalization Filtering Processing circuit arrangement comprises signal conditioning circuit, A/D sampling A, microprocessor, RS485 or the CAN communication module that links to each other successively, and the digital filtering treatment circuit that links to each other with this microprocessor.

As further feature of the present utility model, described pressure transducer adopts LM134 constant current source chip, in conjunction with the IN4004 diode, is equipped with two resistance, forms the constant-current supply of a 0.9mA.

As further feature of the present utility model, described A/D sampling A forms voltage-reference by the voltage stabilizing reference of MC1403 voltage, and links to each other by control bus with described microprocessor.

As further feature of the present utility model, described valve body adopts screw to be connected with over cap, and this screw is built in the counterbore of described valve body bottom.

As further feature of the present utility model, be provided with the shock-proof check pad between described normalization filter processing and valve body.

As further feature of the present utility model, described over cap is a squared design, and itself and described separate type outlet box are fastenedly connected by screw.

Owing to adopt above technical scheme, the little water-mass density on-line monitoring of high voltage electric power equip ment of the present utility model instrument, the utility model is reasonable in design, compact conformation, easy to install, can accurately stable testing high voltage power equipment in the parameter such as water cut, density, temperature of insulating gas.

Description of drawings

Figure 1A is a front view of the present utility model;

Figure 1B is a side view of the present utility model;

Fig. 2 is the circuit block diagram of the normalization Filtering Processing circuit arrangement in the utility model;

Fig. 3 is signal condition, amplification, the filtering circuit figure of pressure transducer in the utility model;

Fig. 4 is the utility model A/D sample circuit figure;

Fig. 5 is the utility model cpu circuit circuit diagram;

Fig. 6 is the utility model communication and contact output circuit figure;

Fig. 7 is the signal condition and the filtering circuit figure of humidity sensor and temperature sensor in the utility model.

Embodiment

The utility model is described in further detail with embodiment with reference to the accompanying drawings below.

As Figure 1A, shown in the 1B, the little water-mass density on-line monitoring of a kind of high voltage electric power equip ment of the present utility model instrument, comprise the humidity sensor 2 that is installed on the valve body 1, pressure transducer 3, temperature sensor 4 and normalization Filtering Processing circuit arrangement 6 and an over cap 5 and separate type outlet box 7, humidity sensor 2, pressure transducer 3, the output terminal of temperature sensor 4 links to each other with normalization Filtering Processing circuit arrangement 6 respectively, these normalization Filtering Processing circuit arrangement 6 output terminals are connected with the male end of separate type outlet box 7, and over cap 5 and valve body 1 link to each other by web member, separate type outlet box 7 is installed on the over cap 5 by web member, in the present embodiment, over cap 5 adopts squared design, and it adopts built-in screw 10 to be connected with valve body 1, screw 10 is built in the valve body 1 bottom counterbore, connects reliable, stressed even, the antidetonation waterproof; And 1 of normalized circuit arrangement 6 and valve body are provided with antidetonation and loosen pad 8, can effectively prevent power equipment when operation vibrations and to the influence of circuit; Separate type outlet box 7 male ends are fastened on by screw on the side of over cap 5, plane contact, and sealing is reliable, the antidetonation mode, and the separate type outlet box is easy to operate simple.

As shown in Figure 2, normalization Filtering Processing circuit arrangement in the utility model comprises the signal conditioning circuit that links to each other successively, the A/D sampling A, microprocessor, RS485 or CAN communication module, and the digital filtering treatment circuit that links to each other with this microprocessor, and be respectively it with insulating power supply power supply is provided, humidity, pressure, temperature sensor is (among the figure 2,3,4) the moisture in the SF6 air chamber, pressure, temperature parameters is converted to corresponding electric signal, pass through signal conditioning circuit then, the sensor signal of gathering is nursed one's health, be the voltage signal of certain limit then with all conversion of signals, with convenient identification.With high-precision A/D sampling A analog voltage signal is converted to digital quantity signal then, again digital signal is changed in the microprocessor, calculate and obtain corresponding parameter, obtain signals such as actual temperature, pressure, moisture, go out the parameter such as density, dew point, ppm, alarm condition of SF6 air chamber again according to Parameters Calculation, obtain all parameters after, again all parameters that obtain by normalization, packing is transferred to supervisory system by RS485 or CAN communication module; The utility model moisture collecting unit sampling special frequency channel filtering technique, the signal of the microprocessor that collection is entered is by FFT software digital filter treatment circuit, special complex electromagnetic environment at transformer station, the interference that the high frequency of filtering transformer station, power frequency magnetic field etc. cause, thus real low-frequency range voltage signal obtained.

The utility model pressure acquisition unit adopts the constant current source power supply technology, pressure transducer adopts LM134 constant current source chip, in conjunction with the IN4004 diode, be equipped with two resistance, form the constant-current supply of a 0.9mA, this power supply is not influenced by ambient temperature, prevents to influence because of variation of temperature the stability of circuit, has guaranteed the stability of pressure transducer output simultaneously; And the utility model is provided with the analog reference voltage technology separately, the A/D sampling A is by the voltage stabilizing reference of MC1403 high-accuracy voltage, form voltage-reference, all signals that enter the A/D sampling A are sampled into one by one, be converted to the digital signal that microprocessor can be discerned, then by control bus, digital signal is transferred to microprocessor in the mode of synchronous serial communication.

Shown in Fig. 3-7, Fig. 3 is signal condition, amplification, the filtering circuit of pressure transducer, and Fig. 7 is the signal condition and the filtering circuit of humidity sensor and temperature sensor.All above-mentioned signals, through conditioning back output voltage signal, enter the A/D sample circuit of Fig. 4, the A/D sampling A is by the voltage stabilizing reference of MC1403 high-accuracy voltage, all signals that enter the A/D sampling A are sampled into one by one, be converted to the digital signal that microprocessor can be discerned, pass through control bus then, digital signal is transferred to microprocessor in the mode of synchronous serial communication, as shown in Figure 5, process software FFT filtering earlier in microprocessor CPU, the filtering unwanted signal, obtain stablizing real data, the temperature that gets according to corresponding algorithm again, pressure, parameters such as moisture are obtaining density by the mathematical model algorithm, PPM, parameters such as dew point are packed these parameters respectively by the data layout of reserving in advance, the mode of recomposition packet is given host computer data transmission with RS485 or CAN module (as shown in Figure 7).

But above-mentioned embodiment is exemplary, is to be the restriction that this patent is comprised scope in order better to make those skilled in the art can understand this patent, can not to be interpreted as; So long as according to spirit that this patent discloses done anyly be equal to change or modify, all fall into the scope that this patent comprises.

Claims

1. the little water-mass density on-line monitoring of high voltage electric power equip ment instrument; it is characterized in that: comprise the humidity sensor that is installed on the valve body; pressure transducer; temperature sensor and normalization Filtering Processing circuit arrangement and an over cap and separate type outlet box; described humidity sensor; pressure transducer; the output terminal of temperature sensor links to each other with described normalization Filtering Processing circuit arrangement respectively; this normalization Filtering Processing circuit arrangement output terminal is connected with the male end of described separate type outlet box; and described over cap links to each other by web member with valve body, and described separate type outlet box is installed on the over cap by web member.

2. on-line monitoring instrument according to claim 1, it is characterized in that: described normalization Filtering Processing circuit arrangement comprises signal conditioning circuit, A/D sampling A, microprocessor, RS485 or the CAN communication module that links to each other successively, and the digital filtering treatment circuit that links to each other with this microprocessor.

3. on-line monitoring instrument according to claim 2 is characterized in that: described pressure transducer adopts LM134 constant current source chip, in conjunction with the IN4004 diode, is equipped with two resistance, forms the constant-current supply of a 0.9mA.

4. on-line monitoring instrument according to claim 3 is characterized in that: described A/D sampling A forms voltage-reference by the voltage stabilizing reference of MC1403 voltage, and links to each other by control bus with described microprocessor.

5. according to each described on-line monitoring instrument among the claim 1-4, it is characterized in that: described valve body adopts screw to be connected with over cap, and this screw is built in the counterbore of described valve body bottom.

6. on-line monitoring instrument according to claim 5 is characterized in that: be provided with the shock-proof check pad between described normalization filter processing and valve body.

7. on-line monitoring instrument according to claim 6 is characterized in that: described over cap is a squared design, and itself and described separate type outlet box are fastenedly connected by screw.