CN2676365Y

CN2676365Y - Oil surface thermostat for transformer

Info

Publication number: CN2676365Y
Application number: CN 200320125256
Authority: CN
Inventors: 叶江鹰
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-22
Filing date: 2003-12-22
Publication date: 2005-02-02
Anticipated expiration: 2013-12-22

Abstract

The utility model discloses an oil surface thermostat for a transformer, comprising a shell, a temperature controller which is arranged in the shell, a fan control device and a connection terminal. A sensor is connected with the shell. A temperature divertor is installed out of the shell, and is connected through the component in the wires and the shell. The utility model has the advantages of simple design structure, easy installation and complete function, outputs the standard current, the voltage signal and the RS485 communication interface synchronistically, and can be used in a digital display instrument and a computer. The outer installation solves the requirements of heat radiation and satisfies the demand of the runtime monitor of the transformer.

Description

Transformer pasta thermostat

Technical field

The utility model relates to the thermostat that is used to detect with the control transformer top-oil temperature.

Background technology

Transformer is in running, and its interior oil temperature will raise along with the increase of service time.This just need carry out monitoring temperature to transformer, in time starts heat sink.The product that the transformer temperature is monitored mainly is made up of temperature control instrument, read out instrument at first.This product structure complexity, read out instrument and used stabilized voltage power supply are separate unit, and on-the-spot installation is very inconvenient, and can not directly provide input signal to use to computer.For this reason, a kind of exportable single curtage signal in people design again is for the transformer pasta thermostat of read out instrument and computer use.Be called " transformer oil surface temperature meter " as Chinese patent ZL01241472.7 name, but, cause the ambient temperature effect of heat that work produces temperature control instrument owing to its temperature transmitter, temperature transmission circuit etc. all are installed in the housing.On the other hand, mode signal output is single, and the user must manufacture with the supplier is special according to the on-the-spot instructions for use of transformer, is unfavorable for use, replacing and the maintenance service work of transformer usefulness pasta thermostat.

The utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art part, and providing a kind of can meet consumers' demand, and can solve the ambient temperature effect of heat that temperature divertor produces to temperature control instrument; And outputting standard electric current, voltage signal and RS485 communication interface synchronously, be directly inputted to the transformer pasta thermostat that read out instrument and computer use.

Technical solution of the present utility model is: transformer pasta thermostat, comprise housing, be arranged on the temperature control instrument in the housing, fan controller and binding post, be connected to transducer with housing, it is characterized in that: temperature divertor is arranged at outside the housing, and temperature divertor is connected with components and parts in the housing by lead.Further, temperature divertor 6 is positioned in housing 1 diaphragm capsule 7 outward.For making thermostat can produce multiple output synchronously, temperature divertor 6 includes single-chip microcomputer IC1, be connected to the pull-up resistor R1 that resets with single-chip microcomputer IC1, be connected to analog to digital conversion circuit IC2 with single-chip microcomputer IC1, be connected to D/A converting circuit IC5 with single-chip microcomputer IC1, be connected to level conversion integrated circuit (IC) 3 with single-chip microcomputer IC1, be connected to memory IC 4 with single-chip microcomputer IC1, be connected to operational amplifier IC6 with analog to digital conversion circuit IC2, be connected to resistance R 3 with operational amplifier IC6, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, adjustable resistance RT1 is connected to optocoupler pipe ID1 with D/A converting circuit IC5, ID2, ID3 and capacitor C 1, C2, C3.

The utility model is compared with prior art, have tangible advantage: solved temperature divertor place in the shell the heat that produces to the ambient temperature effect of temperature control instrument; Special design is further strengthened the function of temperature divertor, and outputting standard electric current, voltage signal and RS485 communication interface synchronously.Can adapt to the requirement of different user, its replacing and maintenance are also facilitated.

Description of drawings

Fig. 1 is a Facad structure schematic diagram of the present utility model;

Fig. 2 is a schematic perspective view of the present utility model;

Fig. 3 is a theory diagram of the present utility model;

Fig. 4 is the utility model temperature divertor circuit theory diagrams.

Embodiment

Referring to Fig. 1-Fig. 4, the transformer of present embodiment comprises housing 1 with the pasta thermostat, is arranged on the temperature control instrument 2 in the housing 1, and fan controller 3 and binding post 4 are connected to transducer 5 with housing 1.Described housing 1 is outside equipped with temperature divertor 6, and temperature divertor 6 is positioned in the diaphragm capsule 7.

Operation principle: transducer 5 (PT100) becomes temperature transition resistance through operational amplifier IC6 (LM358), resistance R 4, R5, R6, R7, R8, the amplifying circuit that R9 forms carries out analog-to-digital conversion to analog to digital conversion circuit IC2 (MCP3201) and becomes digital signal and import among the single-chip microcomputer IC1 (PIC16C73B) and carry out data processing, data one road incoming level change-over circuit IC3 (SN74H184) that handles well converts the output of RS485 dataphone interface to, another road input D/A converting circuit IC5 (AD421), optocoupler pipe ID1, ID2, ID3, capacitor C 1, C2, the D/A converting circuit output 4-20mA electric current that C3 forms.Electric current is through resistance R 13 exportable 1-5V voltages when using 4-20mA or off switch K1, and the while is through the exportable 0-5V voltage of discharge circuit of resistance R 14, R10, R12, R11, R15, adjustable resistance RT1, operational amplifier IC6 composition.Like this, by the synchronous outputting standard electric current of temperature divertor, voltage signal and RS485 communication interface, be convenient to be connected with various external equipments.

Claims

1, transformer pasta thermostat, comprise housing (1), be arranged on the temperature control instrument (2) in the housing (1), fan controller (3) and binding post (4), be connected to transducer (5) with housing (1), it is characterized in that: temperature divertor (6) is arranged at outside the housing (1), and temperature divertor (6) is connected by the interior components and parts of lead and housing (1).

2, transformer according to claim 1 pasta thermostat is characterized in that temperature divertor (6) is positioned in the outer diaphragm capsule (7) of housing (1).

3, transformer according to claim 1 and 2 pasta thermostat, it is characterized in that described temperature divertor (6) includes single-chip microcomputer IC1, be connected to the pull-up resistor R1 that resets with single-chip microcomputer IC1, be connected to analog to digital conversion circuit IC2 with single-chip microcomputer IC1, be connected to D/A converting circuit IC5 with single-chip microcomputer IC1, be connected to level conversion integrated circuit (IC) 3 with single-chip microcomputer IC1, be connected to memory IC 4 with single-chip microcomputer IC1, be connected to operational amplifier IC6 with analog to digital conversion circuit IC2, be connected to resistance R 3 with operational amplifier IC6, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, adjustable resistance RT1 is connected to optocoupler pipe ID1 with D/A converting circuit IC5, ID2, ID3 and capacitor C 1, C2, C3.