CN2163467Y - Passive protector - Google Patents

Abstract

The utility model belongs to a switch controller. The utility model relates to an overload protector which is especially suitable for electric devices which are matched to use with contactors. The utility model mainly comprises a transformer, a conventional rectifier, and a relay. When the utility model is matched to use with an alternating current contactor, a small amount of switch components are installed and connected. The utility model is used for the overload protection of a motor or the other electric device. The utility model has the advantages of stronger overload capacity, wide application range, convenient operation, simple and reasonable structure, etc.

Description

Passive protector

The utility model belongs to on-off controller, is a kind of power consumption equipment overload protective device of being used with contactor of being particularly suitable for.

Active hunting gear and the A.C. contactor of the many employings of protector that is used for the overload of motor or other power consumption equipments at present connects.The main member of active hunting gear is transformer, the rectifier that is connected with 220 volts of AC power, and finishes the overload protection of motor or other power consumption equipments by IC sheet circuit output signals such as three instrument transformers and power amplifier control A.C. contactor.Need many group power supplies, it is bigger influenced by power supply, breaks down as power failure or three-phase alternating-current supply and just can't work.It is big and because environment for use, operating personnel etc. are former thereby deficiency such as be damaged to exist cost height, reactive loss.

The purpose of this utility model is to provide a kind of passive multi-function protector; this protector is that the master constitutes by transformer and conventional rectifier, relay; and a spot of switching device of attaching and A.C. contactor be used, and the overload protection that is used for motor or other power consumption equipments is to overcome the existing in prior technology deficiency.

Overall structure of the present utility model is: transformer T has two elementary windings, adopt two-wire and around, a secondary winding, elementary winding each the lead-in wire respectively be installed in box body on binding post plate A, B, C, D be connected, the lead-in wire of the secondary winding of transformer T is connected with the input of rectification circuit, the output of rectification circuit is connected with the winding of relay J, capacitor C and relay J winding also connect, and binding post plate E, the F on box body is connected with two contacts of the normally closed switch JK of relay J respectively.

The switching device that is connected is respectively: relay normally closed switch JK also meets the normal open switch AN with push button, AN and the control button AN1 interlock that is serially connected in the winding circuit of three-phase ac power cord III and contactor J0, two contacts of AN are connected with the AC power cord II with an end of the winding of J0 respectively, the normally opened contact JK0 of J0 and AN1 also connect, and push-button switch AN2 is serially connected in the winding and the circuit between the AN1 of J0; Rectifier is a bridge rectifier.

Accompanying drawing of the present utility model has:

Fig. 1 is the circuit diagram of passive multi-function protector.

Fig. 2 is each the binding post layout plan on the protector outer casing.

Accompanying drawing has provided embodiment of the present utility model, further specifies as follows in conjunction with the accompanying drawings:

This protector is from establishing power supply; obtain the AC signal of 50Hz from power line as the transient peak operating voltage by transformer T or title current transformer; its the bearing power scope that can control is 3kw-100kw; also can be made into the protector that is applicable to the 0.8kw-2.5kw power consumption equipment; at the beginning of the transformer T in its box body; the line footpath of secondary winding and the bearing power that the number of turn can be protected as required are selected; the type selecting of other members is respectively that relay J can adopt JF22 series miniature relay; the diode that is used for bridge rectifier is 4 1N4007 types; that Fig. 1 represents is the push-button switch AN with auto-reset function that each terminals (as shown in Figure 2) on this protector box body need be installed with A.C. contactor J0 adapted the time; AN1; AN2(is conventional L18 type); this figure also represents protector and 380 volts of three-phase ac power cords and contactor J0, the whole connecting relation of each push-button switch annex.I, II, III are represented 380 volts of AC power cord respectively.The effect of AN is the moment that begins to start when load, because electric current is crossed the open circuit that conference causes the relay J normally-closed contact, must press the AN closed circuit and can normally start with proof load this moment.

The obtained technological progress of the utility model is: because its control method is to obtain the power line signal by transformer T according to the mutual inductance principle to exercise protective effect. This protector cooperates contactor being short-circuited, its protection response time only being 1 second during phase shortage, the 0.8-5 that electric current surpasses rated current when over current fault takes place doubly, its protection response time is 5 seconds, has shortened significantly the response guard time of like product. The characteristics such as it is stronger to have direct protection overload capacity, and the scope of application is wide and easy to use, simple and reasonable.

Claims (2)

1; passive multi-function protector is by the transformer T that is installed in the box body; relay J is main formation; and connect conventional rectification circuit; electronics does not have device and control switch; it is characterized in that transformer T has two elementary windings; adopt two-wire and around; a secondary winding; elementary winding each the lead-in wire respectively with the binding post plate A that is installed on the box body; B; C; D connects; the lead-in wire of the secondary winding of transformer T is connected with the input of rectification circuit; the output of rectification circuit is connected with the winding of relay J; capacitor C and relay J winding also connect, the binding post plate E on box body; F is connected with two contacts of the normally closed switch JK of relay J respectively.

2, protector according to claim 1, it is characterized in that relay normally closed switch JK and meet normal open switch AN with push button, AN and the control button AN1 interlock that is serially connected in three-phase ac power cord III and the contactor J0 winding circuit, two contacts of AN are connected with the AC power cord II with an end of the winding of J0 respectively, the normally opened contact JK0 of J0 and AN1 also connect, and push-button switch AN2 is serially connected in the winding and the circuit between the AN1 of J0; Rectifier is a bridge rectifier.