CN2249983Y - Automatic controlling circuit protector - Google Patents

Abstract

The utility model relates to a protective device for basic electric elements. The utility model carries out the safety protection on application circuits of switchboards, or three-phase electric motors, etc., the unbalance of ultra-high and ultra-low voltage and phase circuits, and the damage on the applied electric appliances. The utility model is characterized in that the third phase line of the background art is additionally provided with a voltage transformer; the voltage transformer is connected with a bridge rectifier, and is connected with a relay. When power shortage of any phase or high voltage and low voltage of the three-phase line are generated, and the power supply is cut off. The utility model protects the safe operation of the circuit, and reduces the unnecessary power consumption loss.

Description

The auto-control line protector

The utility model relates to the protective device in the essential electronic element, specifically is in application circuits such as distribution board or three phase electric machine, phase shortage etc. in the too high or too low and phase circuit to voltage instability, and safeguard protection is carried out in the infringement that corresponding electrical appliance causes.

At present domestic existing " three-phase ac contactor " kind is a lot, and all size is also very complete, application more extensive.But performance is roughly the same; its weak point is that three-phase ac contactor only comes the control contactor loading coil with the two-phase circuit; like this in three-phase line; when not being this two-phase circuit but phase shortage appears in another phase circuit; there is not voltage; A.C. contactor is worked in the same old way, forms the circuit two-phase operation, can not play all-round protection to three-phase line.At this moment voltage uprises suddenly, and electrical appliance holds be can't stand that overload current causes and burn out.Brownout, contactor loading coil electric current descends, and contactor magnetic weakens, and causes contactor platinum burning of contact, makes its job insecurity.A kind of " intelligent electric motor protector " arranged in the market, must be together in parallel with contactor when it uses and use simultaneously, can not use separately.It is just big that in parallel use the, platinum contact are increased current loss, and the probability that breaks down is just high.Owing to be in parallel the use, can not save A.C. contactor in the line, thereby not solve the safety problem in the electrical equipment use.

The utility model purpose is intended to: the security of operation of electrical appliance and circuit is answered in protection to greatest extent, reaches power saving, safety, reliable.

The utility model is to realize purpose of design by following technical scheme.This programme has five parts and forms contact-making switch, voltage autocontrol switch, mutual induction of voltage autocontrol switch, electronic pressure regulating autocontrol switch, mechanical autocontrol switch.Contact-making switch is conducting and cuts off the electricity supply.The voltage autocontrol switch is when circuit wherein during a certain phase phase shortage in the two-phase, self controllable mechanical switch outage, and the mutual induction of voltage autocontrol switch is in the on the low side or three-phase line during an other phase phase shortage, circuit is cut off the power supply when voltage.The electronic pressure regulating autocontrol switch when voltage is higher, behind the induction coil by the mutual induction of voltage coil, imports bridge rectifier into, reaches the line disconnection power cut-off with relay.This point is the difference with background technology.The machinery autocontrol switch only plays switch, is to be moved by above-mentioned a few part controls.Specifically, contact-making switch should be to have three-phase input end to be connected on the power circuit, and three-phase output end is connected on the electrical appliance for example motor, between input and output mechanically controlled switch should be set, in order to cut off supply line's deenergization.Output first phase line, the platinum contact switch of series voltage instrument transformer links to each other with voltage automatic control coil head end, and output third phase line is connected with mutual induction of voltage coil head end, and the end of voltage automatic control and mutual induction of voltage coil links together.The second phase line series relay platinum contact switch of output connects the end of voltage automatic control coil.Voltage automatic control coil control mechanically controlled switch.Bridge rectifier of induction coil two terminations of mutual induction of voltage coil, the output two ends of a bridge rectifier electrochemical capacitor in parallel also is connected the two ends that the relay inductance now encloses.

Work as first and second phase line like this and lack any phase time, the outage of voltage automatic control coil control mechanical switch.When second phase line or third phase line, lack a phase time arbitrarily, the first mutual induction of voltage coil also can be controlled voltage automatic control coil and make the mechanical switch outage.When voltage raise suddenly, the coil-induced second mutual induction of voltage coil of first mutual induction of voltage imported the inductance coil of miniature relay into by bridge rectifier, its magnetic is increased, relay platinum contact disconnects, and cuts off the electric current of voltage automatic control coil, makes the mechanical switch outage.Cause the voltage automatic control coil and the first mutual induction of voltage coil not to reach the operating voltage of self when voltage reduces, magnetic weakens, and makes the platinum contact disconnection out of control of two coils, and mechanical switch cuts off the power supply, and has protected the safety of circuit and electrical appliance, has saved power consumption.

Now in conjunction with the accompanying drawings the utility model is further described.

Figure: fundamental diagram of the present utility model.

Drawing explanation: Z ₁, Z ₂, Z ₃The input power supply, U ₁, U ₂, U ₃Out-put supply, L ₁The contactor loading coil, L ₂Voltage automatic control coil, L ₃The relay inductance coil, BL ₁The mutual induction of voltage coil, BL ₂The mutual induction of voltage induction coil, K ₁The Contactor Starting switch, K ₂Additional shutdown switch, K ₃Mutual induction of voltage platinum contact switch, K ₄Relay platinum contact switch, KP ₁First mechanically controlled switch, KP ₂Second mechanically controlled switch, D motor, D ₁～D ₄The bridge rectifier circuit, R ₁Resistance, W ₁Pilot bulb, C ₁Electrochemical capacitor.

Press the Contactor Starting K switch ₁, contactor loading coil L ₁After 1 second of power consumption, startup finishes, and imports power supply Z this moment ₁, Z ₂, Z ₃Connect out-put supply U ₁, U ₂, U ₃, voltage automatic control coil L ₂, the first mutual induction of voltage coil BL ₁And the relay inductance now encloses L ₃All conduct electricity work, make mutual induction of voltage platinum contact switch K ₃With relay platinum contact switch K ₄Closed admittance, supply line and electrical appliance motor D work well.Pilot bulb W ₁Bright, bulb W ₁Can be with red.Output phase U ₁Serial connection mutual induction of voltage platinum contact switch K ₃With voltage automatic control coil L ₂Origin or beginning connects, and is terminal by polyphone relay platinum contact switch K ₄With output U mutually ₂Connect.Output phase U ₃Serial connection mutual induction of voltage coil BL ₁With voltage automatic control coil L ₂End be connected together.At out-put supply U ₃With mutual induction of voltage coil BL ₁Between be provided with additional shutdown switch K ₂In the time need stopping power supply, can pull additional shutdown switch K with electric unit ₂, cut off the electricity supply.Mutual induction of voltage coil BL ₁Control mutual induction of voltage platinum contact switch K ₃Disconnect (normally-closed contact).As output phase U ₁Or U ₂During arbitrary phase phase shortage, voltage automatic control coil L ₂Do not have electric current to pass through, two ends there are not voltage, cause mechanical switch KP to cut off the power supply voluntarily.KP ₁With KP ₂Interlock.As output phase U ₂Or U ₃During arbitrary phase phase shortage, mutual induction of voltage coil BL ₁Two ends there are not voltage, mutual induction of voltage platinum contact switch K ₃Disconnect, cause voltage automatic control coil L ₂Two ends there are not voltage, and mechanical switch KP cuts off the power supply voluntarily.Mutual induction of voltage coil BL ₁Induction coil BL ₂Two termination bridge rectifier circuit D ₁～D ₄, two output-parallel resistance R of this circuit ₁, pilot bulb W ₁, electrochemical capacitor C ₁Inductance coil L with relay ₃, inductance coil L ₃Control K ₄, K ₄Be normally closed platinum contact switch, when circuit voltage raises suddenly, by mutual induction of voltage coil BL ₁Induction BL ₂, by bridge rectifier circuit D ₁～D ₄Import relay inductance coil L into ₃, magnetic increases, and inhales and opens normally closed platinum contact switch K ₄, make automatic control coil L ₂Outage, mechanical switch KP ₁Disconnect.

When circuit voltage because load too much causes descending its voltage automatic control coil L ₂, mutual induction of voltage coil BL ₁Brownout does not reach self operating voltage, and magnetic weakens, two platinum contact switch K ₃, K ₄Disconnection out of control simultaneously, its mechanical switch KP cuts off down circuitry.

The safety of protective circuit operation and electrical appliance has been accomplished in this design, high pressure or overlond running can not occur, saves power consumption, reaches purpose of design.

Claims (1)

1; in the supply line by the output of contact-making switch; the platinum contact switch of the first phase line series voltage instrument transformer links to each other with voltage automatic control coil head end; the second phase line series relay platinum contact switch is connected on the auto-control line protector of the end of voltage automatic control coil; it is characterized in that output third phase line is connected with mutual induction of voltage coil head end; the end of voltage automatic control and mutual induction of voltage coil links together; bridge rectifier of two terminations of the induction coil of mutual induction of voltage coil; bridge rectifier two an outputs electrochemical capacitor in parallel, and be connected the two ends of relay inductance coil.