CN2800611Y

CN2800611Y - Phase-failure protection device for three-phase power supply

Info

Publication number: CN2800611Y
Application number: CN 200520102447
Authority: CN
Inventors: 王文杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-05-23
Filing date: 2005-05-23
Publication date: 2006-07-26
Anticipated expiration: 2015-05-23

Abstract

The utility model relates to a phase-failure protection device for a three-phase power supply. Six rectifying diodes (D1 to D6) are connected to a three phase power supply (A, B, C); the rectifying end of the rectifying diodes (D1 to D6) supply a release (T), and the other end is connected with a normally open point of a relay contact (J1); signal is detected by a signal detection circuit which is composed of four resistors (R1, R2, R3, R4), two diodes (D7, D8) and two optocouplers (IC2, IC3) that output a pulse signal to two pins (3, 5) of an integrated circuit (IC1), and a pin (6) of the integrated circuit (IC1) outputs a pulse signal to drive a transistor (BG) to attract a relay (J). Therefore, the relay contact (J1) is changed into a normally closed state from the primary normally open state, the release (T) obtains electricity to start up a residual current circuit breaker or a breaker tripping device so as to disengage a backing power supply and protect rear equipment.

Description

Specification three phase mains open phase protection

One, affiliated technical field

The utility model relates to three phase mains open phase protection in the electrical network.

Two, background technology

In the three-phase circuit, owing to disconnect a phase, cause the asynchronous machine single-phase operation, this is the main cause that threephase asynchronous machine burns out.After the phase failure, if applied load is constant, because the motor useful torque reduces, then the electric current in the winding will increase, and will make burn-down of electric motor.Take off device and existing circuit breaker (comprising residual current circuit breaker) all has the long delay thermal overload release and move electromagnetism wink, circuit overload is played practical protective effect.Therefore, in the control circuit of motor, adopt circuit breaker widely.But in use,, cause the phase failure unavoidable because of the reasons such as blown fuse of the power transformer phase failure or front.At present, three phase mains phase failure protector product is more, but the general circuit complex structure, the production cost height.

Three, utility model content

The purpose of this utility model is to provide a kind of three phase mains open phase protection; it is simple in structure; cost is low, is widely used in various model residual current circuit breaker and circuit breaker, can protect back level equipment effectively and can not damage because of the phase failure when any phase phase failure appears in power supply.

For achieving the above object; the solution that the utility model is taked is: a kind of three phase mains open phase protection; it has a signal deteching circuit; this signal deteching circuit is by two identical optocoupler IC2; IC3; four identical in twos resistance R 1; R3 and resistance R 2; R4; two identical diode D7; D8 forms; resistance R 1; on the one termination A phase power supply of R2 serial connection back; another termination optocoupler IC2 input; resistance R 3; on the one termination B phase power supply of R4 serial connection back; another termination optocoupler IC3 input; diode D7; D8 also connects on their the positive termination C phase power supply; diode D7 negative terminal connects another input of optocoupler IC2; diode D8 negative terminal connects another input of optocoupler IC3; rectifier diode D1-D6 is connected on A; B; on the C three phase mains; their rectifications one termination release T; the other end is succeeded the normal battle of appliance contact J1; 3 pin of optocoupler IC2 output termination integrated circuit (IC) 1; 5 pin of optocoupler IC3 output termination integrated circuit (IC) 1; 8 pin of integrated circuit (IC) 1 are succeeded electrical equipment J; optocoupler IC2; another output of IC3; 6 pin connect triode BG base stage, the triode BG collector connecting relay J other end.

It is simple in structure, and cost is low, is widely used in various model residual current circuit breaker and circuit breaker, can protect back level equipment effectively and can not damage because of the phase failure when any phase phase failure appears in power supply.Its operation principle is as follows: rectifier diode D1-D6 is connected on A; B; on the C three phase mains; supply with release T by rectifier diode D1-D6 rectification one end; the other end is succeeded the normal battle of appliance contact J1; resistance R 1; R2; R3; R4; diode D7; D8 and optocoupler IC2; the signal deteching circuit that IC3 forms detects signal; optocoupler IC2; pulse signal of IC3 output is to 3 pin and 5 pin of integrated circuit (IC) 1; pulse signal driving of 6 pin output triode BG by integrated circuit (IC) 1 makes the relay J adhesive; relay contact J1 becomes normally closed by original often opening; release T gets; start residual current circuit breaker or circuit breaker tripping device; level power supply before throwing off, protection back level equipment.

Four, description of drawings

Fig. 1 is the electrical connection diagram of present embodiment,

Five, embodiment

Below in conjunction with embodiment and accompanying drawing thereof the utility model is remake description.

Referring to Fig. 1; a kind of three phase mains open phase protection; it has a signal deteching circuit; this signal deteching circuit is by two identical optocoupler IC2; IC3; four identical in twos resistance R 1; R3 and resistance R 2; R4; two identical diode D7; D8 forms; resistance R 1; on the one termination A phase power supply of R2 serial connection back; another termination optocoupler IC2 input; resistance R 3; on the one termination B phase power supply of R4 serial connection back; another termination optocoupler IC3 input; diode D7; D8 also connects on their the positive termination C phase power supply; diode D7 negative terminal connects another input of optocoupler IC2; diode D8 negative terminal connects another input of optocoupler IC3; rectifier diode D1-D6 is connected on A; B; on the C three phase mains; their rectifications one termination release T; the other end is succeeded the normal battle of appliance contact J1; 3 pin of optocoupler IC2 output termination integrated circuit (IC) 1; 5 pin of optocoupler IC3 output termination integrated circuit (IC) 1; 8 pin of integrated circuit (IC) 1 are succeeded electrical equipment J; optocoupler IC2; another output of IC3; 6 pin connect triode BG base stage, the triode BG collector connecting relay J other end.

Referring to Fig. 1, the RC circuit that optocoupler IC2 output termination is made up of resistance R 5 and capacitor C 1, the RC circuit that optocoupler IC3 output termination is made up of resistance R 6 and capacitor C 2.

Claims

1; a kind of three phase mains open phase protection; it has a signal deteching circuit; it is characterized in that: this signal deteching circuit is by two identical optocouplers (IC2); (IC3); four identical in twos resistance (R1); (R3) and resistance (R2); (R4); two identical diodes (D7); (D8) form; resistance (R1); (R2) on the one termination A phase power supply of serial connection back; another termination optocoupler (IC2) input; resistance (R3); (R4) on the one termination B phase power supply of serial connection back; another termination optocoupler (IC3) input; diode (D7); (D8) and connect on their the positive termination C phase power supply; diode (D7) negative terminal connects another input of optocoupler (IC2); diode (D8) negative terminal connects another input of optocoupler (IC3); rectifier diode (D1)-(D6) is connected on A; B; on the C three phase mains; their rectifications one termination release (T); the other end is succeeded the normal battle of appliance contact (J1); 3 pin of optocoupler (IC2) output termination integrated circuit (IC1); 5 pin of optocoupler (IC3) output termination integrated circuit (IC1); 8 pin of integrated circuit (IC1) are succeeded electrical equipment (J); optocoupler (IC2); (IC3) another output; 6 pin connect triode (BG) base stage, triode (BG) collector connecting relay (J) other end.

2, a kind of three phase mains open phase protection according to claim 1; it is characterized in that: the RC circuit that optocoupler (IC2) output termination is made up of resistance (R5) and electric capacity (C1), the RC circuit that optocoupler (IC3) output termination is made up of resistance (R6) and electric capacity (C2).