CN2160153Y

CN2160153Y - Fusing alarm for fuse

Info

Publication number: CN2160153Y
Application number: CN 93233147
Authority: CN
Inventors: 巫颐华
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-30
Filing date: 1993-01-30
Publication date: 1994-03-30
Anticipated expiration: 2003-01-30

Abstract

The utility model provides a fusing alarm for fuses, which relates to a device for detecting faults for low-voltage electrical apparatus. The utility model solves that the detection faults and alarms for the fusing of fuses or not when the fuses are on the job, and the safe operation of the electrical apparatus is protected. The two ends of the fuse are respectively connected with a rectifying circuit, and a detecting and alarming circuit is connected in series between the terminals with same polarity of the two rectifying circuits; the other output terminals with the same polarity are connected with each other, the rectifying circuit which is connected with the side of loading is connected in parallel with a current limiting resistor, the current limiting resistor is used for detecting that the circuit is switched on or not, and the detecting and alarming circuit is a DC relay or a light emitting diode. The utility model has the advantages of simple structure; the utility model is suitable for using as the indication for the alarm of the faults for the low-voltage fuses.

Description

Fusing alarm for fuse

The utility model relates to a kind of failure detector of low-voltage electrical apparatus, particularly a kind of fuse blows alarm.

In the power and distribution supply cable, be extensive use of various low-tension fuses at present.When fuse blows, can only rely on the operator on duty to check and find out, very inconvenient.Then can cause the damage accident of power consumption equipment in some occasion, for example in the threephase asynchronous control circuit, when a phase fuse blows, be in the single phasing state, will cause the motor burnout failure as untimely outage.In the thyristor variable flow device, a large amount of fast acting fuses that use must be provided with fast molten fuse protection link, and each device fabrication producer has used the Electronic Protection circuit of design separately for this reason, perhaps uses sensitive switch of theory of mechanics or the like.Therefore the fuse blows alarm of also being badly in need of a kind of super quality and competitive price is supporting with it, to improve the device reliability of operation.

The purpose of this utility model provides a kind of fuse blows alarm that is used to detect the low-tension fuse operating state.

The utility model is finished with following mode: it comprises two rectification circuit Z1 and the Z2 that is connected to fuse RD both sides respectively, and detection alarm circuit I and current-limiting resistance R1 form.Serial connection detection alarm circuit I between the same polarity output of above-mentioned rectification circuit Z1 and Z2, another same polarity output of rectification circuit Z1 and Z2 is connected, and is being connected on the rectification circuit Z2 output of load-side and is meeting the current-limiting resistance R1 that the detection current path is provided.Its detection alarm circuit I is direct current relay J or LED or constitutes with the light controllable silicon serial connection direct current relay J of photoelectrical coupler SCR.When fuse RD did not all fuse, two rectification circuit Z1 equated with the Z2 output voltage, and group detects newspaper and respects that no current flows through in the alert circuit I.When having when fusing among the fuse RD at least, the output voltage of two rectification circuit Z1 and Z2 does not wait, and in the Z1 output voltage is higher than the time of Z2 output voltage, flows through electric current and sends alarm signal in the detection alarm circuit I, has finished the function of detection alarm.

Main feature of the present utility model is: one fusing detection signal is taken from two sides of fuse, is not subjected to influencing of power network fluctuation, interference, and alarm can not send the signal of indication warning yet when the electrical network phase shortage, so the reliability height; It two is to use scope wide, applicable to single phase poaer supply circuit, three-phase power circuit, can not use the power supply center line for three-phase power circuit, all can use from the circuit that exchanges 10 volts to 380 volts, only need select the value of suitable current-limiting resistance R1 for use for supply voltage; It three is that the rectification circuit Z1 that is connected to mains side simultaneously can not need to be provided with separately working power as the working power of testing circuit I after the fuse fault again, so circuit is very simple, cost is low; It four is that volume is little, and it also is easy to be combined in the electric equipment products such as switch with knifeshaped fuse, knife switch, makes it to become the novel electric equipment products with fuse alarm function.

Fig. 1 is the electrical schematic diagram of the utility model in three-phase circuit,

Fig. 2 is the utility model two rectifier bridge output waveform figures when fuse blows,

Fig. 3 is the circuit theory diagrams of the utility model embodiment one,

Fig. 4 is the circuit theory diagrams of the utility model embodiment two,

Fig. 5 is the circuit theory diagrams of the utility model embodiment three,

Fig. 6 is the circuit theory diagrams of the utility model embodiment four.

The utility model is described in further detail below in conjunction with accompanying drawing:

Now from accompanying drawing 1, accompanying drawing 2 is introduced operation principle of the present utility model in detail, and in the accompanying drawing 1, diode D1-3 and D7-9 constitute rectifier bridge Z1, and D4-6 and D7-9 constitute rectifier bridge Z2; Detection alarm circuit I is serially connected between the U2 point of the U1 point of rectifier bridge Z1 and rectifier bridge Z2, the electricity input side of fuse RD1-RD3 and load-side are connected to the input of rectifier bridge Z1 and Z2 respectively, when three fuse RD1-RD3 all do not fuse, the U1 point equates with U2 point current potential, so no current flows through in the detection alarm circuit I.When having a fusing among the RD1-RD3 at least, U1U2, this moment, detection alarm circuit I flow through electric current.In 2RD when fusing only for example,, the oscillogram of ordering from accompanying drawing 2U1 point and U2 as can be seen; At the T0-T1 in each cycle moment U1U2, this moment, detection alarm circuit I flow through electric current, after the fusing signal is detected, sent indication by the performance element II, alarm signal.

In the accompanying drawing 1: R1 provides the current-limiting resistance of current path for detecting the loop, and YR1-3 is the overvoltage protection piezo-resistance, and rectifier bridge Z1 is as the working power of carrying out the loop II simultaneously.

When power supply was three-phase four-wire system, circuit can further be simplified, and diode D7-9 can save, the U0 point directly and the power supply center line join and get final product.

Accompanying drawing 3 is one of fuse blows alarm practical circuit.Its feature is that the little relay J of actuator also is detecting unit, all circuit is by little relay J of six diode D1-D6, a resistance R 1 and three piezo-resistance YR1-YR3 form, circuit is very simple, it is applicable to the electric power loop of three-phase four-wire system, so saved three diodes, the setting of normally closed contact J is for eliminating the wild effect of J when closed among the figure.

Accompanying drawing 4 is two of a fuse blows alarm practical circuit, and its detection alarm circuit I is photo thyristor SCR, and when fuse RD1-RD3 had a fusing at least, SCR flow through the electric current conducting because of its diode, and alarm signal is sent in the relay J action.After it is combined in switch with knifeshaped fuse, just can be made into novel switch with knifeshaped fuse with fusing warning function.

Accompanying drawing 5 is three of a fuse blows alarm practical circuit, LED is detection alarm circuit I and also is the performance element II, when fuse blows, the bright index signal of sending of LED lamp, after it is combined in knife switch, just can be made into novel knife switch with fusing deixis.

Accompanying drawing 6 is the fuse alarm circuit of single fuse, and the bright then indicating fuse of LED1 lamp fuses; The bright of LED2 lamp also can not indicated having or not of power supply simultaneously.When it is combined in the socket of fuse or band fuse, just can be made into new type fuse with fuse failure deixis and the socket of being with fuse.

Claims

1, a kind of fuse blows alarm, it comprises two rectification circuit Z1 and the Z2 that is connected to fuse RD two ends respectively, it is characterized in that serial connection detection alarm circuit I between the same polarity output of above-mentioned rectification circuit Z1 and Z2, another same polarity output of rectification circuit Z1 and Z2 is connected, and is being connected on the rectification circuit Z2 output of load-side and is meeting the current-limiting resistance R1 that the detection current path is provided.

2,, it is characterized in that detection alarm circuit I is direct current relay J or LED or constitutes with the light controllable silicon serial connection direct current relay J of photoelectrical coupler SCR according to right 1 described alarm.