CN2129994Y - Micro power consumption phase interruption protector - Google Patents

Abstract

The utility model discloses a phase failure protector used for electrical equipment, comprising a sample circuit, a switch circuit and a filter circuit. The sample circuit is composed of resistance and capacitance which are connected in parallel. A single-stage delaying switch circuit is composed of the capacitance, a transistor and a relay, and two output terminals are respectively connected with the two ends of a control loop. A monitoring range is enlarged by the utility model, a transmission line can be graded and controlled, and the open-phase protection of multi-station or single-station equipment can be processed. The utility model has the advantages of safe use, low power consumption, small size and short delay time.

Description

Micro power consumption phase interruption protector

The utility model relates to a kind of phase failure protector, particularly a kind of phase failure protector that relates to three-phase four-line system.

Existing phase failure protector, as: the current mode phase failure protector, its use, making has limitation, and protection range is little, is only limited to the three-phase balance load; The voltage-type phase failure protector, its transformer manufacture technology complexity, the cost height, the circuits for triggering debug difficulties, the master control appliance contact moves and easily produces misoperation when asynchronous.When supply line's fault-free, consumed power is bigger, and instant fast maintenance has certain risk.

The purpose of this utility model is to provide a kind of reliable in action, safe, low in energy consumption, without transformer, need not the debugging, the little power consumption phase failure protector that is suitable for producing in enormous quantities, improved prior art deficiency.

Task of the present utility model is finished as follows: 3 resistance compose in parallel three sample circuits respectively and connect three phase mains circuit contact respectively with three electric capacity, two resistance, electric capacity, triode and a relay are formed the single-stage delay switch circuit, and two outputs connect the two ends of control loop respectively.

The also further as follows specific implementation of task of the present utility model: the collector electrode of triode connects two diode cathodes of rectification circuit by relay in parallel and diode, dropping resistor.Base stage connects the anode and the resistance R of an electric capacity respectively by resistance ₅, emitter connects negative terminal, the negative terminal of filter capacitor and the positive pole of two diodes of rectification circuit of an electric capacity.Filter capacitor anode, the resistance other end connect the negative pole of another resistance, diode and an end of relay, the positive pole of a diode of rectification circuit, the negative pole of another diode connect ground, and the positive pole of other diode and the negative pole of another diode connect sample circuit.

The little power consumption phase failure protector that uses the utility model to provide has enlarged monitoring range, can be to the transmission line hierarchical monitoring, also can carry out open phase protection to many or single device; and safety, low in energy consumption, cancelled transformer; do not need accessory power supply, reduced cost, volume is also little, assembling is simple.During the supply line normal power supply, no thermal response, noiselessness, delay time is short, and reliable in action can be according to designing requirement, and that utilizes relay moves, closes (often opening) contact, the shunt opening trip coil of control circuit breaker.Also can utilize moving, disconnected (normally closed) contact, the control circuit breaker, contactor, the decompression release coil of magnetic starter compensator disconnects governor circuit, cuts off the electricity supply.

Below in conjunction with accompanying drawing the utility model is done further narration.

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is the utility model and the schematic diagram that connects of three-phase four-wire system electric appliance circuits.

With reference to Fig. 1, resistance R ₁, R ₂, R ₃Be parallel to capacitor C respectively ₁, C ₂, C ₃Constitute sample circuit, and connect contact A, B, C in the three phase mains circuit respectively, N is a ground wire.Diode D ₁, D ₂, D ₃, D ₄Form rectification circuit, dropping resistor R ₄, filter capacitor C ₄Resistance R ₅, R ₆, relay J, capacitor C ₅, triode DG constitutes delay switch, diode D ₅Constitute the self-induced e.m.f path of relay J.

With reference to Fig. 2, three phase mains circuit input A ', B ', C ', fuse RD, knife switch HK, overcurrent relay RJ, alternating current motor M, C ₈Be circuit breaker decompression release coil, C ₇Be C ₈Auxiliary normally opened contact, C ₆Be C ₈Quiet, the moving contact of master, shutdown switch TA, starting switch QA, phase failure protector S, 1 ' termination, 1 end, 2 ' termination, 2 ends.

When open phase fault takes place in supply line, the sample circuit capacitor C ₁, C ₂, C ₃Signal voltage output is arranged, through diode D ₁, D ₂, D ₃, D ₄Rectification, resistance R ₄Step-down, capacitor C ₄Filtered direct voltage is done the operating voltage of delay switch circuit, triode DG conducting after delaying time, and the relay J action, control loop opens circuit, and contact 1 ' end and 2 ' end disconnects.Cut off the electricity supply, reach the purpose of protection electrical appliance.Supply line disconnects the back resistance R ₁, R ₂, R ₃, to capacitor C ₁, C ₂, C ₃Residual charge discharge, guarantee instant maintainer's personal safety and the unlikely damage of maintenance instrument.

Claims (2)

1, a kind of little power consumption phase failure protector, it comprises: sample circuit, switching circuit, filter circuit is characterized in that resistance R ₁, R ₂, R ₃, and capacitor C ₁, C ₂, C ₃Compose in parallel three sample circuits respectively and connect three phase mains circuit contact A, B, C, resistance R respectively ₅, R ₆, capacitor C ₅, triode DG, relay J are formed the single-stage delay switch circuit, output 1 ' and, 2 ' end connects 1,2 ends of control loop respectively.

2, according to the described little power consumption phase failure protector of claim 1, the collector electrode that it is characterized in that triode DG is by relay J and diode D in parallel ₅, dropping resistor R ₄The diode D that connects rectification circuit ₁, D ₂Negative pole, base stage is passed through resistance R ₆Connect delay capacitor C respectively ₅Anode and resistance R ₅, emitter connects capacitor C ₅Negative terminal, filter capacitor C ₄Negative terminal, and rectification circuit D ₃, D ₄Positive pole, capacitor C ₄Anode, resistance R ₅Other end connection electrical resistance R ₄, diode D ₅One end of negative pole and relay J, rectification circuit diode D ₂Anodal, D ₃Negative pole connect ground, D ₁Positive pole and D ₄Negative pole connect sample circuit.

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