CN2676366Y

CN2676366Y - Thermostat for transformer winding

Info

Publication number: CN2676366Y
Application number: CN 200320125257
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 a thermostat for transformer winding, comprising a shell, a temperature controller arranged in the shell, a fans control device and a connection terminal. A sensor is connected with the shell. A temperature converter and a current transformation converter which are 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. The problem of heat radiation is solved, and the thermostat for transformer winding satisfies the requirement of the runtime monitor of the transformer. At the same time, the thermostat for transformer winding can output the standard current, the voltage signal and the RS485 communication interface synchronously, and can be used in a digital display instrument and a computer.

Description

The Transformer Winding thermostat

Technical field

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

Background technology

Transformer is in running, and its interior oil temperature and coil temperature will raise along with the increase of service time.This just need carry out monitoring temperature to transformer, and in time starts heat sink.The product that the transformer temperature is monitored mainly is made up of temperature control instrument, current transformer, read out instrument at first.It mainly is the secondary rated current with the transformer current instrument transformer, and after current transformer was adjusted, input was inlaid in the electric heating element in the temperature control instrument bellows, makes it to produce heat, and the displacement of flexible member is increased.Therefore, behind the load, the displacement of flexible member is determined by transformer top-oil temperature and transformer load current both on the transformer belt, thereby simulation has reflected the temperature of tested transformer.Its product structure complexity is installed inconvenience.So people have designed a kind of transformer winding temperature gage of monitoring transformer top-oil temperature and transformer coil temperature again.Be called " transformer winding temperature gage " as Chinese patent ZL01241312.7 name, but, cause heat that work produces that the ambient temperature of temperature control instrument is exerted an influence because its convertor circuit is loaded in the thermometer.On the other hand, mode signal output is single, and the user must according to the on-the-spot instructions for use of transformer and the supplier is special manufactures, and is unfavorable for the replacing and the maintenance service work of transformer winding temperature gage.

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 temperature divertor, unsteady flow heat that transducer the produces ambient temperature effect to temperature control instrument; And outputting standard electric current, voltage signal and RS485 communication interface synchronously, be directly inputted to the Transformer Winding thermostat that read out instrument and computer use.

Technical solution of the present utility model is: the Transformer Winding 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 and unsteady flow transducer are arranged at outside the housing, and they are connected with components and parts in the housing by lead.Further, external temp transducer and unsteady flow transducer are positioned in the diaphragm capsule.For making thermostat can produce multiple output synchronously, temperature divertor is provided with single-chip microcomputer IC2, be connected to analog to digital conversion circuit IC3 with single-chip microcomputer IC2, be connected to D/A converting circuit IC1 with single-chip microcomputer IC2, be connected to level shifting circuit IC5 with single-chip microcomputer IC2, be connected to operational amplifier IC4 with D/A converting circuit IC1, be connected to adjustable resistance RT1, resistance R 1 and pressurizer (LM336) with analog to digital conversion circuit IC3, be connected to resistance R 2, R3, R5, R6, R7, R8, R9, R10, R11, adjustable resistance RT2 and K switch 1 with operational amplifier IC4.

The utility model is compared with prior art, have tangible advantage: solved the temperature transition body 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 Winding of present embodiment comprises housing 1 with 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 unsteady flow transducer 7.Described housing 1 outer temperature divertor 6 and the unsteady flow transducer 7 that is provided with is positioned in the diaphragm capsule 8.Like this, solved temperature divertor and unsteady flow transducer place in the housing the heat that produces to the ambient temperature effect of temperature control instrument.

Described theory structure is as shown in Figure 3: be connected to temperature sensor, unsteady flow transducer, temperature divertor with temperature control instrument.By the synchronous outputting standard electric current of temperature divertor, voltage signal and RS485 communication interface.Operation principle is: transducer becomes temperature transition resistance to become voltage through analog to digital conversion circuit IC3 (MCP3201) by adjustable resistance RT1, pressurizer LM336, the circuit supplied with digital signal that resistance R 1 is formed carries out data processing in single-chip microcomputer IC2 (PIC16F628), data one road incoming level change-over circuit IC5 (SN74H184) that handles well converts the output of RS485 dataphone interface to, another road input D/A converting circuit IC1 (TLC5615), resistance R 2, become voltage through operational amplifier IC4 (LM358) in the circuit that R3 forms, the discharge circuit output 4-20mA electric current that resistance R 6 is formed.Electric current is through resistance R 9 exportable 1-5V voltages when using 4-20mA or shutting K switch 1, and the while is through the exportable 0-5V of discharge circuit of resistance R 10, R7, R5, R6, R11, adjustable resistance RT2, operational amplifier IC4 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 Winding 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) and unsteady flow transducer (7) are arranged at outside the housing (1), and they are connected by the interior components and parts of lead and housing (1).

2, Transformer Winding thermostat according to claim 1 is characterized in that described external temp transducer (6) and unsteady flow transducer (7) are positioned in the outer diaphragm capsule (8) of housing (1).

3, Transformer Winding thermostat according to claim 1 and 2, it is characterized in that described temperature divertor (6) is provided with single-chip microcomputer IC2, be connected to analog to digital conversion circuit IC3 with single-chip microcomputer IC2, be connected to D/A converting circuit IC1 with single-chip microcomputer IC2, be connected to level shifting circuit IC5 with single-chip microcomputer IC2, be connected to operational amplifier IC4 with D/A converting circuit IC1, be connected to adjustable resistance RT1 with analog to digital conversion circuit IC3, resistance R 1 and pressurizer (LM336) are connected to resistance R 2 with operational amplifier IC4, R3, R5, R6, R7, R8, R9, R10, R11, adjustable resistance RT2 and K switch 1.