CN2565183Y

CN2565183Y - Under-voltage open-phase monitor

Info

Publication number: CN2565183Y
Application number: CN 02274221
Authority: CN
Inventors: 赵奎林
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-17
Filing date: 2002-07-17
Publication date: 2003-08-06
Anticipated expiration: 2012-07-17

Abstract

The utility model relates to an under-voltage open-phase monitor. A phase line of a circuit with a three phase four wire system is connected with a coil ZJ of an auxiliary relay. Three phases a, b and c of a three-phase power supply are respectively connected in an alarm bulb and an electric bell through normal open contacts CB of the ZJ. Each phase is connected with a running load through a normal open contact CK of the ZJ, each phase is respectively connected with voltmeters V1, V2 and V3 and transformers B1, B2 and B3, wherein sublevels of the B1, the B2 and the B3 are respectively connected with linear scale followers GSQ, and the output ends of the three followers GSQ are connected with the coil ZJ of the auxiliary relay in series between two phase lines. The utility model has the advantages of simple structure, low cost, ordinary materials, convenient operation, accurate and timely monitoring, low rate of electricity consumption and large monitoring capacity, and a single machine can monitor a plurality of electric devices of a power supplying circuit. The utility model not only can monitor the operation of a low-voltage circuit, but also can be installed in the position of a secondary exit of a distribution transformer, and the connection of a 380V voltage with household appliances, which is caused by the breaking of a zero line, can be prevented. The utility model can also monitor faults, such as ablation flashover, grounding, phase failure, etc., caused by a high-voltage distribution circuit.

Description

Under-voltage phase failure watch-dog

(1) technical field

The utility model belongs to the electrical operation technical field, is specifically related to a kind of under-voltage, phase failure supervising device of low-voltage electrical apparatus.

(2) background technology

Present existing low pressure operation supervising device has ammeter, voltmeter and under-voltage, open phase protection.Common under-voltage, open phase protection has two classes: the one, the current/voltage mixed type, its under-voltage protection is at the indirect relay magnetic coil of low pressure two-phase, but when relay electric-loss trip protection; And when under-voltage or the phase failure took place that does not connect mutually, it did not have protective effect.Moreover this type of under-voltage protection mainly is mounted on the big capacity automatic air-break switch.The 2nd, current-control type, the electric current debug setting when this type of protector is pressed the motor run with load.If motor is when light running, though a certain mutually under-voltage or phase failure, just it loses protective effect.This type of protector band carries finite capacity, and that maximum is 40KW.Because above-mentioned restriction, the loss that many industrial and mining enterprises are under-voltage to the high and low pressure circuit, the phase failure causes feels at a loss what to do.According to the statistics made by the departments concerned: the motor that burn national every year reaches more than 600 ten thousand, and direct economic loss reaches more than 100 hundred million yuans.

(3) summary of the invention

The purpose of this utility model provides under-voltage, the phase failure watch-dog in a kind of electrical operation system, and it is under-voltage, the phase failure situation in the monitoring system accurately, and can in time report to the police, cut off the electricity supply with protection equipment.The technical solution adopted in the utility model is: be connected to auxiliary relay coil ZJ on the phase line in the three-phase four-wire system power circuit; A, b, c three phase mains insert warning bulb and electric bell SGJ, another termination zero-power line o of SGJ by the normally opened contact CB of ZJ respectively.Each connects running load by the normally opened contact CK of ZJ respectively mutually.A, b, c respectively are connected to voltmeter V1, V2, V3 and transformer B1, B2, B3 mutually respectively, the secondary proportional linearity follower GSQ that is connected to respectively of B1, B2, B3,2 of the outputs of three follower GSQ and auxiliary relay coil ZJ are connected in series between two phase lines.Proportional linearity follower GSQ is that the diode group is composed in series by diode D1～Dn by the positive pole of transformer B secondary coil one terminating diode group, and the negative pole of Dn connects the solenoid of midget relay J, another termination transformer of J coil B secondary coil other end; The D1 negative pole also connects electrochemical capacitor C1 positive pole, and the C1 negative pole connects the transformer B secondary coil other end.

The utility model is to form the proportional linearity follower that can remember with the light current element.The proportional linearity follower is exactly the circuit with memory function of secondary voltage and the synchronous linear change of primary voltage.To the selected a certain determined value of follower circuit is overturn and control auxiliary relay, thus the control power consumption equipment, and sound and light alarm and voltage indication are arranged.Follower install in the line and have " with " logical action of OR-gate, any one has under-voltage, phase failure situation to take place mutually, all can make the intermediate relay ZJ upset, gives the alarm and cuts off main circuit power.

The utility model is simple in structure, cheap, material is common, easy to operate, the monitoring accurately and timely, the reliable in action rate reaches 100%, the unit consumption rate is low, the monitoring capacity is big, can reach 1500KW, unit can be monitored some power consumption equipments of a current supply circuit.Stop, report to the police and can divide usefulness, also can be shared, one-machine-multi-function.Both can monitor low-voltage circuit operation, and also can be installed in distribution transformer secondary exit, can prevent neutral line break and 380 volts of house lead ins causing; And can monitor faults such as ablation arcing that high-tension distributing line produces, the ground connection phase failure.

(4) description of drawings

Fig. 1 is circuit theory diagrams of the present utility model;

Fig. 2 is the proportional linearity follower circuit schematic diagram in the utility model circuit.

(5) embodiment

O among Fig. 1, a, b, c is the low pressure three-phase four-wire power, ZJ is the auxiliary relay magnetic coil, CK is that auxiliary relay often goes into operation and does the contact, CB is the normally closed operating contact of auxiliary relay, K1, K2, K3 is a hand switch, SGJ is the warning lamp and the alarm bell of three cover audible-visual annunciators, warning lamp selects that 220V/8W's is red for use, green, yellow three colored electric lamp bulbs, alarm bell is selected the small-sized inner striking type electric bell of 220V, V1 for use, V2, V3 is the 250V A.C. voltmeter, B1, B2, B3 is the 220V/12V/15W single-phase transformer, GSQ is the proportional linearity follower, its circuit theory diagrams such as Fig. 2, and wherein AQ is the follower start button, C is a 30V/1000 μ f electrolytic capacitor, and D1～Dn is a diode 4007.J is 12 volts of micro DC relay pull-in windings, ※ is the selected needed number of diodes adjustment of a certain memory voltage value, the selected number of diodes of execution mode is adjusted into 16～18, memory voltage is single-phase 165～170 volts, because 165～170 volts of following voltages are dangerous voltages of burn-out motor, and be that the actuating motor maximum pressure drop does not reach the magnitude of voltage that this machine is disturbed by misoperation.Execution mode casts in the GSQ that adjusts in the capsule with epoxy resin.

During work, send electricity with o, a, b, c, V1, V2, V3 have 3 single-phase voltage readings.Press AQ1, AQ2, AQ3 successively, make three followers enter operating state, auxiliary relay adhesive simultaneously, the startup power supply of all controlled plants is connected.Close K1, K2, K3 switch make audible-visual annunciator enter quasi-operating status.In circuit any one have mutually that contact is loosening, loose contact, ablation arcing so that situations such as the phase failure take place, make this phase voltage owe to memory value when following, the follower of this phase overturns, auxiliary relay discharges, the controlled plant outage is stopped, the while sound and light alarm, voltmeter has reading directly perceived, and which phase fault comes into plain view.

Claims

1, a kind of under-voltage phase failure watch-dog is characterized in that being connected on the phase line in the three-phase four-wire system circuit auxiliary relay coil ZJ; A, b, c three phase mains insert warning bulb and electric bell SGJ, another termination zero-power line o of SGJ by the normally opened contact CB of ZJ respectively; Each connects running load by the normally opened contact CK of ZJ respectively mutually; A, b, c respectively are connected to voltmeter V1, V2, V3 and transformer B1, B2, B3 respectively mutually, the secondary linear scale follower GSQ that is connected to respectively of B1, B2, B3, and the output of three follower GSQ and auxiliary relay coil ZJ series connection are between two phase lines; Proportional linearity follower GSQ is that the diode group is composed in series by diode D1～Dn by the positive pole of transformer B secondary coil one terminating diode group, and the negative pole of Dn connects the solenoid of midget relay J, another termination transformer of J coil B secondary coil other end; The D1 negative pole also connects electrochemical capacitor C1 positive pole, and the C1 negative pole connects the transformer B secondary coil other end.

2, under-voltage phase failure watch-dog according to claim 1 is characterized in that the quantity of the diode Dn in its proportional linearity follower is adjusted into 16～18.