CN2817163Y

CN2817163Y - Leakage current acting protector for preventing dry combustior

Info

Publication number: CN2817163Y
Application number: CN 200520102960
Authority: CN
Inventors: 钱加灿
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-15
Filing date: 2005-06-15
Publication date: 2006-09-13
Anticipated expiration: 2015-06-15

Abstract

The utility model relates to a leakage current action protector which can prevent the dry combustion of an electric appliance, particularly a leakage current action protector for preventing dry combustion of an electric appliance, which comprises a sensor and a leakage protector composed of a zero sequence mutual inductor, a circuit breaker, an amplifier, a rectifier, a test loop and controlled silicon, wherein one end of the sensor is connected to one electrode in a power supply loop, the other end of the sensor is connected with the circuit breaker, the amplifier is connected with a trigger electrode of the controlled silicon, a cathode of the controlled silicon is connected with a negative electrode of the rectifier and an anode of the controlled silicon is connected with a positive electrode of the rectifier. The utility model has the advantages that controlled silicon of the existing leakage protector is fully used as a touch element of a control circuit of the sensor, existing electronic elements are reduced, which can simplify the original structure of a leakage current action protector for preventing dry combustion, meanwhile, the safety of electric appliances, users and environment is ensured, thus, the structure is simple and the cost is low.

Description

A kind of residual current operated protective device of anti-dry

Technical field

The utility model relates to a kind of residual current operated protective device, particularly a kind of residual current operated protective device that can prevent the electrical equipment dry combustion method.

Background technology

Existing residual current operated protective device; it comprises the earth leakage protective device of being made up of zero-sequence transformer, release, amplifier, rectifier, test loop and controllable silicon SCR; also comprise a controllable silicon and at least one transducer; one of each transducer is terminated at any utmost point in the current supply circuit; the other end of each transducer is connected respectively and is inserted the controllable silicon trigger electrode after the resistance R; the controllable silicon negative electrode connects the negative pole of rectifier; anode connects the positive pole of rectifier, a dielectric capacitance in parallel between silicon controlled trigger electrode and the negative electrode.Though it can prevent the electrical equipment dry combustion method by the transducer in the electrical equipment this structure,, so the circuit structure complexity, increased cost because of it has additionally increased a controllable silicon and other electronic components.

Summary of the invention

Technical problem to be solved in the utility model is to overcome the above-mentioned defective of prior art and residual current operated protective device that a kind of anti-dry is provided, makes that it is simple in structure, cost is low.

The utility model solves the problems of the technologies described above the technical scheme that is adopted:

A kind of residual current operated protective device of anti-dry; comprise by zero-sequence transformer, circuit breaker, amplifier, rectifier, test loop and an earth leakage protective device and the transducer that controllable silicon is formed; one of described transducer is terminated at the utmost point in the current supply circuit; the other end of transducer links to each other with an end of circuit breaker; amplifier connects described silicon controlled trigger electrode; the controllable silicon negative electrode links to each other with the negative pole of rectifier, and anode links to each other with the positive pole of rectifier.

Compared with prior art; advantage of the present utility model is to make full use of the controllable silicon of existing earth leakage protective device; with its shake-up element as sensor control circuit; and reduce existing electronic component; make it can simplify the structure of the residual current operated protective device of original anti-dry; guarantee electrical equipment, user and environmentAL safety simultaneously, therefore simple in structure, cost is low.

Description of drawings

Fig. 1 is the circuit diagram of the utility model embodiment;

Fig. 2 is the circuit diagram of another embodiment of the utility model;

Fig. 3 is the circuit diagram of the another embodiment of the utility model.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1; a kind of residual current operated protective device of anti-dry; by zero-sequence transformer LLH, circuit breaker ZK, amplifier 2, rectifier DC, test loop T, an earth leakage protective device and the transducer 1 that controllable silicon SCR is formed; one of transducer 1 is terminated at any utmost point in the current supply circuit; the other end of transducer 1 links to each other with the end of circuit breaker ZK; amplifier 2 connects the trigger electrode of a controllable silicon SCR; this controllable silicon SCR negative electrode links to each other with the negative pole of rectifier DC, and anode links to each other with the positive pole of rectifier DC.

The sensor is the open type transducer, as long as be open-circuit condition when operate as normal, the transducer that can sport channel status when non-normal working is all available.It can be bimetal leaf, magnetic sentive switch, displacement transducer, liquid-level switch, thermal-reed switch or the like.

The sensor is connected in the electrical equipment, and when taking place to heat up in the electrical equipment, transducer just can become short circuit by open circuit like this; thereby the connection circuits for triggering make trip coil energising work, by the earth leakage protective device deenergization; thereby prevent the electrical equipment dry combustion method, protection electrical equipment, prevent the generation of accident.

The sensor can have a plurality of, receives in a plurality of electrical equipment the safe operation of control apparatus respectively.Because earth leakage protective device can not automatically reset, only after abnormal condition is got rid of. press the reset key of earth leakage protective device again, just can restore electricity. satisfied safety requirements.

As shown in Figure 2, other electronic components are identical with connected mode and Fig. 1, and just transducer 1 links to each other with the positive pole of rectifier DC, can serve the same role equally.

Transducer 1 also can link to each other with the negative pole of rectifier DC, as shown in Figure 3.

Claims

1, a kind of residual current operated protective device of anti-dry; comprise by zero-sequence transformer, circuit breaker, amplifier, rectifier, test loop and an earth leakage protective device and the transducer that controllable silicon is formed; it is characterized in that: one of described transducer is terminated at the utmost point in the current supply circuit; the other end of transducer links to each other with an end of circuit breaker or links to each other with the negative or positive electrode of rectifier; amplifier connects described silicon controlled trigger electrode; the controllable silicon negative electrode links to each other with the negative pole of rectifier, and anode links to each other with the positive pole of rectifier.