CN201282016Y - Safety energy-saving transformer - Google Patents

Abstract

The utility model relates to a transformer, in particular to a safety and energy-saving transformer, which comprises a transformer and a protective device. The protective device comprises a bimetallic strip used for disconnecting a power supply of the transformer when serious heating fault of the transformer occurs, and a PTC thermistor used for preventing the automatic reset of the disconnected bimetallic strip; and the bimetallic strip and the PTC thermistor are connected in parallel and then connected in series to the primary side of the transformer. The safety and energy-saving transformer of the utility model can prevent the overload, the short circuit and the overheating of the transformer.

Description

The energy-saving safe transformer

Technical field

The utility model relates to a kind of transformer, is specifically related to a kind of energy-saving safe transformer.

Background technology

Two the most common fault types of linear transformer are overvoltage and short circuit accident, and wherein any temperature of Transformer Winding that all can cause raises.May cause that winding insulation is aging rapidly, thermal runaway or finally cause transformer to damage, severe patient, direct or indirect initiation fire then, thereby jeopardize life and property safety.Solution commonly used is in primary side a Thermal Cutoffs to be installed, and in primary side an electric current fuse is installed, and this solution can prevent overheated and over-current condition simultaneously.But because fuse is disposable device, blown fuse will cause the transformer permanent damage.In addition, present employed transformer, during standby power consumption substantially all more than one watt, have in addition reach tens watts, consumed a large amount of energy in vain, be unfavorable for effective utilization of electric power resource.

Summary of the invention

At above-mentioned technical problem, the purpose of this utility model provides a kind of transformer overload, short circuit, overheated energy-saving safe transformer of preventing.

The purpose of this utility model is achieved in that a kind of energy-saving safe transformer; comprise transformer and protective device; this protective device comprises that being used for transformer fault generates heat and disconnect the bimetal leaf of transformer frequency response when serious; and be used to prevent to disconnect the automatically reset PTC thermistor of bimetal leaf, bimetal leaf and the primary side that is serially connected with transformer after the PTC thermistor is in parallel.

Adopted such scheme; protective device comprises that being used for transformer fault generates heat and disconnect the bimetal leaf of transformer frequency response when serious; and be used to prevent the automatically reset PTC thermistor of the bimetal leaf that disconnects, bimetal leaf and the primary side that is serially connected with transformer after the PTC thermistor is in parallel.Merge one by bimetal leaf and high molecular PTC thermistor, have manual reducible characteristics, compare with traditional transformer, on the one hand, transformer can cut off the input power supply automatically under the situation of overload or short circuit, prevents the harm of the person and property; On the other hand, transformer is being fixed a breakdown, and after re-powering, can continue to use, and greatly reduces raw-material waste, meets the demand of international market to energy savings.

The input of described controller is serially connected with the primary side of transformer, and its output is serially connected with the secondary side of transformer, when controller detection transformer output is non-loaded, cuts off the power supply of transformer input automatically, and the transformer dead electricity is not worked; Controller detects the transformer output and connects when going up load, automatic energized, and transformer gets the electric normal operating state that enters.By controller, when no-load transformer, its stand-by power consumption can be controlled in the 0.3W, greatly reduces energy consumption, is beneficial to energy savings.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the circuit structure diagram of protective device;

Embodiment

With reference to Fig. 1 and Fig. 2, energy-saving safe transformer of the present utility model comprises transformer 1, protective device 2 and controller 3.Protective device 2 comprises that being used for transformer fault generates heat and disconnect the bimetal leaf K of transformer frequency response when serious, and is used to prevent to disconnect the automatically reset PTC thermistor of bimetal leaf R, bimetal leaf and the primary side that is serially connected with transformer after the PTC thermistor is in parallel.Bimetal leaf K is the closed or switch that disconnects under assigned temperature, and bimetal leaf K is formed by stacking by the different alloy of two-layer thermal coefficient of expansion, and the coefficient of expansion is bigger is called active layers; The coefficient of expansion is less is called passive layer.Because two layers of material coefficient of expansion difference, bimetal leaf be meeting flexural deformation when temperature raises, and temperature can be recovered reset condition after reducing.The PTC thermistor has the constant temperature heat generation characteristic, PTC thermistor energising back self-heating heats up and makes resistance enter the transition district, heated at constant temperature PTC thermistor gauge surface temperature will keep steady state value, and this temperature is only relevant with the Curie temperature and the applied voltage of PTC thermistor, and irrelevant substantially with ambient temperature.The input of controller 3 is serially connected with the primary side of transformer, and its output is serially connected with the secondary side of transformer, when this controller detection transformer output is non-loaded, cuts off the power supply of transformer input automatically, and transformer is not worked; Controller detects the transformer output and connects when going up load, automatic energized, and transformer gets the electric normal operating state that enters.Controller 3 is the chip of MEC type.

When faults such as transformer overload or short circuit; cause the transformer heating serious; temperature rises and surpasses the rated value of bimetal plate heat protector; bimetal leaf disconnects; at this moment voltage just is added in PTC thermistor two ends entirely; the thermistor self-heating heats up and makes resistance enter the transition district, and the PTC self-heating is in temperature constant state.By the heat that the PTC thermistor distributes, guarantee on the reset temperature value of bimetal leaf protector, reset in bimetal leaf is during transformer fault preventing.After fault was got rid of, the power supply that is disconnected input was by reclosing, and bimetal leaf resets, the transformer operate as normal.

Claims (2)

1. energy-saving safe transformer; comprise transformer; it is characterized in that: also comprise a protective device; this protective device comprises that being used for transformer fault generates heat and disconnect the bimetal leaf of transformer frequency response when serious; and be used to prevent to disconnect the automatically reset PTC thermistor of bimetal leaf, bimetal leaf and the primary side that is serially connected with transformer after the PTC thermistor is in parallel.

2. energy-saving safe transformer according to claim 1 is characterized in that: also comprise a controller, the input of this controller is serially connected with the primary side of transformer, and its output is serially connected with the secondary side of transformer.

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