CN1066154A

CN1066154A - Three phase electric machine phase shortage, earth leakage protective device

Info

Publication number: CN1066154A
Application number: CN 91106396
Authority: CN
Inventors: 腾洪福
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-23
Filing date: 1991-04-23
Publication date: 1992-11-11

Abstract

The present invention is a kind of three phase electric machine phase shortage, earth leakage protective device; it is mainly linked to each other with motor three-phase incoming line by leakage protection circuit, open-phase protection circuit and warning circuit; all be provided with relay in each circuit; when power supply phase shortage and phase voltage imbalance or body leakage appear in operating motor; difference action by each relay is cut off the power supply motor automatically and is given the alarm.Highly versatile of the present invention can be directly used in the three phase electric machine of different capabilities, plays phase shortage, earth leakage protective effect.

Description

Three phase electric machine phase shortage, earth leakage protective device

The invention belongs to the motor protecting switch field, specifically a kind of three phase electric machine phase shortage, earth leakage protective device.

As everyone knows, have three phase electric machine phase shortage, earth leakage protective device now, will select the protector of different capabilities in actual use according to capacity motor, the power consumption of protector own is serious in addition, volume is big, cost is high.

Purpose of the present invention just is to avoid the shortcoming of prior art, and three phase electric machine phase shortage, the earth leakage protective device of a kind of highly versatile, no power consumption is provided.

Feature of the present invention to achieve the above object of the invention is: open-phase protection circuit resistance R 1 is distinguished in parallel with capacitor C 2, resistance R 3 with capacitor C 3 with capacitor C 1, resistance R 2, one end of each shunt circuit is connected to respectively on three-phase power line a, b, the c of motor D, the other end of each shunt circuit then links to each other with an input of diode D1, D2, D3, full-wave rectifier that D4 forms jointly by common method of attachment, the output loop of full-wave rectifier is formed in resistance R 4, voltage-stabiliser tube DW1, relay J 1 series connection back, and electrochemical capacitor C4 and voltage-stabiliser tube DW1, relay J 1 are in parallel; Body leakage protective circuit diode D8, resistance R 10, voltage-stabiliser tube DW2, relay J 2 series connection; the anode of diode D8 links to each other with the shell of motor D, and relay J 2 is connected with another input of zero-power line d and diode D1, D2, D3, full-wave rectifier that D4 forms respectively.

Cut-offing alarming circuit resistance R 5 and diode D5, resistance R 6 and diode D6, resistance R 7 is connected respectively with diode D7, resistance R 7, R6, R5 respectively with motor D three-phase power line a, b, c links to each other, diode D5, D6, behind the negative electrode short circuit of D7 with resistance R 9, push-button switch NA, the normally opened contact J1-1 of relay J 1 and relay J 3 series connection, the other end of relay J 3 then is connected with zero-power line d, the normally opened contact J2-1 of relay J 2, the normally opened contact J3-2 of relay J 3 is common in parallel with the normally opened contact J1-1 of relay J 1, LED, the shunt circuit is formed with electric bell JL in resistance R 8 series connection backs, and the back cross-over connection is connected between the negative electrode and zero-power line d of diode D5 in this shunt circuit with the normally opened contact J3-3 of relay J 3.

Be connected across between incoming line a, the b of motor D after the normally-closed contact J3-1 of relay J 3, A.C. contactor C, the normally opened contact C1-4 series connection, on three power line a, b between open-phase protection circuit and the cut-offing alarming circuit, c, be respectively equipped with three normally opened contact C1-1, C1-2, the C1-3 of A.C. contactor C.

If capacitor C 1, C2, C3 output AC voltage that the three-phase voltage balance then is connected on three-phase power line a, b, the c are zero, relay J 1 does not just influence the normal rotation of three phase electric machine D because of can not get the operating voltage tripping yet during machine operation; When three phase mains is appointed when lacking a phase (or two-phase), be added in capacitor C 1, C2, Voltage unbalance on the C3 and voltage output is arranged, this voltage is through diode D1, D2, D3, D4 forms the full-wave rectifier output dc voltage, make relay J 1 action, cut off the power supply of motor D by the interlock of A.C. contactor C, wherein resistance R 4 is a current-limiting resistance, capacitor C 4 is a filter capacitor, when filter output dc voltage during greater than the puncture voltage of voltage-stabiliser tube DW1, relay J 1 ability action message, in the circuit behind the adjunction voltage-stabiliser tube DW1, can avoid the slight imbalance of three characteristics of the middle term supply voltage and cause relay J 1 malfunction, cause stopping accident, resistance R 1, R2, R3 is a capacitor C 1, C2, the discharge resistance of C3; When the electric leakage of operating motor housing through diode D8 rectification output dc voltage, if output dc voltage is during greater than the puncture voltage of voltage-stabiliser tube D2, relay J 2 actions, A.C. contactor C also moves simultaneously and cuts off the motor D power supply, and wherein resistance R 10 is a current-limiting resistance; The diode D5 of cut-offing alarming circuit; D6; D7 forms three-plase half wave rectifier circuit; its effect be no matter three phase mains lack one mutually or two-phase can both normally provide power supply to cut-offing alarming circuit; resistance R 5; R6; R7 is diode D5; D6; the current-limiting resistance of D7; relay J 2 actions in relay J in the open-phase protection circuit 1 or leakage protection circuit; its normally opened contact J1-1 or J2-1 closure; electric current is through resistance R 9; push-button switch NA; normally opened contact J1-1 or J2-1 make relay J 3 actions; thereby normally-closed contact J3-1 disconnects; A.C. contactor C outage makes its normally opened contact C1-1; C1-2; C1-3 disconnects; cut off the motor D power supply; simultaneously because normally opened contact J3-2 closure makes relay J 3 self-sustaining normally opened contact J3-3 closures; thereby electric bell JL reports to the police; LED is luminous; wherein resistance R 8 is the current-limiting resistance of LED; as need disconnected warning circuit is resetted, the switch NA that only needs to push the button then stops to report to the police.

Description of drawings: Fig. 1 is circuit theory diagrams of the present invention, also is a kind of embodiment circuit theory diagrams.

Mark among the figure: resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, capacitor C 1, C2, C3, electrochemical capacitor C4, relay J 1, J2, J3, normally opened contact J1-1, J2-1, J3-2, J3-3, normally-closed contact J3-1, diode D1, D2, D3, D4, D5, D6, D7, voltage-stabiliser tube DW1, DW2, electric bell JL, push-button switch NA, LED, A.C. contactor C, normally opened contact C1-1, C1-2, C1-3, C1-4, motor D, power line a, b, c, zero line d.

Optimum implementation of the present invention is: resistance R 1, R2, R3 are 510K Ω, R4 is 30 Ω, R5, R6, R7, R10 are 20 Ω, and R8 is 40K Ω, and R9 is 10 Ω, capacitor C 1, C2, C3 are 0.15 μ f, electrochemical capacitor C4 is 100 μ f, and relay J 1, J2 select the JZC-22 type for use, and relay J 3 is selected the JDX-4 type for use, voltage-stabiliser tube DW1, DW2 voltage stabilizing value are 6V, and electric bell JL operating voltage 220V, A.C. contactor C are the C-40 type.Phase shortage, leakage protection circuit resistance R 1 and capacitor C 1, resistance R 2 and capacitor C 2, resistance R 3 is in parallel respectively with capacitor C 3, then together with the common short circuit of an end of these three shunt circuits, the other end in each loop then respectively with motor D three-phase power line a, b, one among the c links to each other, diode D8 and resistance R 10, voltage-stabiliser tube DW2, relay J 2 series connection, the anode of diode D8 is connected with the motor D shell, relay J 2 other ends and resistance R 1, R2, the common terminal of R3 is respectively by common method of attachment and diode D1, D2, D3, two inputs of full-wave rectifier that D4 forms link to each other, voltage-stabiliser tube DW1, relay J 1 series connection back is in parallel with electrochemical capacitor C4, connect with resistance R 4 again in this shunt circuit, wherein the positive pole of electrochemical capacitor C4 links to each other with negative electrode and the resistance R 4 of voltage stabilizing didoe DW2, and then diode D1 is inserted by common method of attachment in this loop, D2, D3, two outputs of full-wave rectifier that D4 forms; Cut-offing alarming circuit resistance R 5 and diode D5, resistance R 6 and diode D6, resistance R 7 with after diode D7 connects respectively with diode D5, D6, the negative electrode short circuit of D7 together, and with resistance R 9, push-button switch NA, the normally opened contact J1-1 of relay J 1 and relay J 3 series connection, relay J 3 is connected on the zero-power line d, and resistance R 7, R6, R5 then respectively with power line a, b, c links to each other, relay J 2 normally opened contact J2-1, the normally opened contact J3-2 of relay J 3 is common in parallel with normally opened contact J1-1, electric bell JL and the resistance R 8 that is cascaded, LED is formed the shunt circuit, and connect, and then this circuit is connected across between the negative electrode of zero-power line d and diode D5 with the normally opened contact J3-3 of relay J 3.Normally-closed contact J3-1 series connection back adjacent with three phase mains respectively two power line a, the b in its two ends of A.C. contactor C, normally opened contact C1-4, relay J 3 is connected, and is respectively equipped with normally opened contact C1-1, C1-2, the C1-3 of A.C. contactor C on power line a, the b between open-phase protection circuit and the cut-offing alarming circuit, the c.

To pack in the housing of phase shortage, earth leakage protective device by the circuit board that circuit diagram shown in Figure 1 is made, connect three phase mains, when the three-phase voltage balance, capacitor C1, C2, C3 output AC voltage are zero, relay J 1 can not get operating voltage and tripping, the motor D operate as normal; If three phase mains lacks a phase, when two-phase or phase voltage are uneven, capacitor C1, C2, C3 has alternating voltage output, this voltage is via diode D1, D2, D3, D4 forms the full-wave rectifier rectification and output dc voltage, make relay J 1 action, normally opened contact J1-1 closure, this moment is because power line a, b, among the c one phase or two-phase still have voltage, then electric current is through diode D5, D6, the common port of D7, resistance R 4, normally opened contact J1-1, relay J 3 forms the loop to zero-power line d, and relay J 3 produces action and makes normally opened contact J3-3, the J3-2 closure, normally-closed contact J3-1 disconnects.Normally opened contact J3-3 closure, electric current be through electric bell JL and LED, makes electric bell JL vibration, LED luminous, thereby send the alarm of power supply phase shortage.Normally opened contact J3-2 closure, make relay J 3 self-sustaining normally opened contact J3-3 closures, thereby guarantee electric bell JL, LED ceaselessly vibrates and luminous, if press the button then deenergization of switch NA this moment, relay J 3 is resetted, and electric bell JL, LED stop vibration and luminous, normally-closed contact J3-1 disconnection, and then A.C. contactor C resets, thereby normally opened contact C1-1, C1-2, C1-3 be deenergization line a, b, c thereupon resetting also, the motor D stall.Full-wave rectifier institute output dc voltage must just can make relay J 1 produce action greater than the puncture voltage of voltage-stabiliser tube DW1, has avoided three-phase mains voltage because of slight imbalance causes relay J 1 malfunction like this, causes stopping accident; When the motor D shell produces electric leakage, through diode D8 halfwave rectifier output dc voltage, if the direct voltage of output is during greater than the puncture voltage of voltage-stabiliser tube DW2, then relay J 2 actions, normally opened contact J2-1 closure, electric current makes J3 produce action by the common port of diode D5, D6, the D7 relay J 3 of flowing through, and electric bell JL, LED produce vibration and luminous and send the electric leakage alarm.The disconnection of normally-closed contact J3-1 makes A.C. contactor C produce action, and normally opened contact C1-1, C1-2, C1-3 also disconnect thereupon, thereby power line a, b, c open circuit the motor D stall.

The present invention has idle, characteristics such as cost is low, reliability is big, highly versatile compared to existing technology, and it can directly apply to the threephase motor of different capabilities, plays phase shortage, earth leakage protective effect.

Claims

A kind of three phase electric machine phase shortage earth leakage protective device is made up of housing, open-phase protection circuit, body leakage protective circuit, cut-offing alarming circuit etc., it is characterized in that:

1, open-phase protection circuit resistance R 1 is distinguished in parallel with capacitor C 2, resistance R 3 with capacitor C 3 with capacitor C 1, resistance R 2, one end of each shunt circuit is connected to respectively on three-phase power line a, b, the c of motor D, the other end of each shunt circuit then links to each other with an input of triode D1, D2, D3, full-wave rectifier that D4 forms jointly, the output loop of full-wave rectifier is formed in resistance R 4, voltage-stabiliser tube DN1, relay J 1 series connection back, and electrochemical capacitor C4 and voltage-stabiliser tube DN1, relay J 1 are in parallel;

2, body leakage protective circuit diode D8, resistance R 10, voltage-stabiliser tube DW2, relay J 2 series connection; the anode of diode D8 links to each other with the shell of motor D, and relay J 2 is connected with another input of zero-power line d and diode D1, D2, D3, full-wave rectifier that D4 forms respectively.