CN203883463U - Three-phase alternating current neutral line open circuit protection device - Google Patents
Three-phase alternating current neutral line open circuit protection device Download PDFInfo
- Publication number
- CN203883463U CN203883463U CN201420244479.9U CN201420244479U CN203883463U CN 203883463 U CN203883463 U CN 203883463U CN 201420244479 U CN201420244479 U CN 201420244479U CN 203883463 U CN203883463 U CN 203883463U
- Authority
- CN
- China
- Prior art keywords
- contactor
- relay control
- control unit
- neutral line
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007935 neutral effect Effects 0.000 title claims abstract description 48
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000004821 Contact adhesive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The utility model discloses a three-phase alternating current neutral line open circuit protection device comprising a first relay control unit, a second relay control unit, a third relay control unit, a first switch block, a second switch block, a third switch block and an alternating current contactor KM4. The relay control units are connected between phase lines and a neutral line. The switch blocks are connected with the coil of the alternating current contactor KM4 in series and are then connected between the phase lines and the neutral line. The neutral line is grounded through a normally-open main contact of the alternating current contactor KM4. The relay control units control the conduction of relays according to the change of phase voltage and further enable the corresponding switch block to operate, so that the alternating current contactor KM4 is in electric conduction with the ground and the neutral line is finally grounded. Through the cooperation of the relay control units, the switch blocks and the alternating current contactor, the neutral line is forced to be grounded on the user side in case of open circuit, so that the damage to electric appliances caused by voltage rise on the user side is prevented and the effect of protecting the safe operation of the electric appliances is achieved.
Description
Technical field
The utility model relates to low voltage equipment resist technology field, is specifically a kind of three phase mains neutral line broken circuit protecting equipment.
Background technology
It is common power consumption equipment power supply that three-phase alternating current adopts phase voltage 220V, in actual use, because network neutral line opens circuit, causes power consumption equipment side voltage to raise burning out the accident of household electrical appliance and equipment to happen occasionally.
Utility model content
The purpose of this utility model is to provide a kind of three-phase alternating current electrical neutral axis broken circuit protecting equipment, for power consumption equipment provides protection.
The technical scheme that realizes the object of the invention is as follows: a kind of three-phase alternating current electrical neutral axis broken circuit protecting equipment, comprises
The first relay control unit: the primary coil of transformer T forms power input part and divides, the first end of secondary coil is connected to the positive pole of diode D2, the negative pole of diode D2 is connected to the input of potentiometer W1, and the output of potentiometer W1 is connected to the collector electrode of triode BG1; The second end of the secondary coil of transformer T is connected to the collector electrode of triode BG1; The centre tap of the secondary coil of transformer T is connected to the positive pole of diode D1, and the negative pole of diode D1 is connected to the input of the coil of relay J, and the output of the coil of relay J is connected to the emitter of triode BG1; The base stage of triode BG1 is connected to the adjustable side of potentiometer W1 by rheostat W2; Between the collector electrode of the negative pole of diode D1 and triode BG1, be also connected with capacitor C 1, between the negative pole of diode D2 and the collector electrode of triode BG1, be also connected with capacitor C 2; Between the emitter and collector of triode BG1, be also in series with resistance R and LED;
The second relay control unit, the 3rd relay control unit are identical with the structure of the first relay control unit;
The power input part of described the first relay control unit divides and is connected to phase line W and neutral line N; After the coil series connection of the normally opened contact of the relay J of the first relay control unit and A.C. contactor KM1, be connected between phase line W and neutral line N;
The power input part of described the second relay control unit divides and is connected to phase line V and neutral line N; After the coil series connection of the normally opened contact of the relay J of the second relay control unit and A.C. contactor KM2, be connected between phase line V and neutral line N;
The power input part of described the 3rd relay control unit divides and is connected to phase line U and neutral line N; After the coil series connection of the normally opened contact of the relay J of the 3rd relay control unit and A.C. contactor KM3, be connected between phase line W and neutral line N;
Neutral line N often opens main contacts ground connection by A.C. contactor KM4's;
The first switches set: A.C. contactor KM1 often open main contacts and first of A.C. contactor KM4 often open auxiliary contact in parallel after, then the first normally closed auxiliary contact of the A.C. contactor KM2 that connects is, the first normally closed auxiliary contact of A.C. contactor KM3;
Second switch group: A.C. contactor KM2 often open main contacts and second of A.C. contactor KM4 often open auxiliary contact in parallel after, then the first normally closed auxiliary contact of the A.C. contactor KM1 that connects is, the second normally closed auxiliary contact of A.C. contactor KM3;
The 3rd switches set: A.C. contactor KM3 often open main contacts and the 3rd of A.C. contactor KM4 often open auxiliary contact in parallel after, then the second normally closed auxiliary contact of the A.C. contactor KM1 that connects is, the second normally closed auxiliary contact of A.C. contactor KM2;
The input of described the first switches set is connected to phase line W, and the input of described second switch group is connected to phase line V, and the input of described the 3rd switches set is connected to phase line U; After the output parallel connection of described the first switches set, second switch group and the 3rd switches set, the coil by A.C. contactor KM4 is connected to neutral line N.
The beneficial effects of the utility model are; by the co-operating of relay control unit, switches set and A.C. contactor; after the neutral line opens circuit, force it on user's side joint ground, avoid user's side voltage to raise and damage power consumption equipment, reach the effect of protection power consumption equipment safe operation.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Because the second relay control unit is identical with the first relay control unit structure with the 3rd relay control unit, therefore omit in figure.
Embodiment
As shown in Figure 1, three-phase alternating current electrical neutral axis broken circuit protecting equipment, comprises
The first relay control unit: the primary coil of transformer T forms power input part and divides, the first end 1 of secondary coil is connected to the positive pole of diode D2, the negative pole of diode D2 is connected to the input of potentiometer W1, and the output of potentiometer W1 is connected to the collector electrode of triode BG1; The second end 2 of the secondary coil of transformer T is connected to the collector electrode of triode BG1; The centre tap 3 of the secondary coil of transformer T is connected to the positive pole of diode D1, and the negative pole of diode D1 is connected to the input of the coil of relay J, and the output of the coil of relay J is connected to the emitter of triode BG1; The base stage of triode BG1 is connected to the adjustable side of potentiometer W1 by rheostat W2; Between the collector electrode of the negative pole of diode D1 and triode BG1, be also connected with capacitor C 1, between the negative pole of diode D2 and the collector electrode of triode BG1, be also connected with capacitor C 2; Between the emitter and collector of triode BG1, be also in series with resistance R and LED;
The second relay control unit, the 3rd relay control unit are identical with the structure of the first relay control unit;
The power input part of described the first relay control unit divides and is connected to phase line W and neutral line N; After the coil series connection of the normally opened contact of the relay J of the first relay control unit and A.C. contactor KM1, be connected between phase line W and neutral line N;
The power input part of described the second relay control unit divides and is connected to phase line V and neutral line N; After the coil series connection of the normally opened contact of the relay J of the second relay control unit and A.C. contactor KM2, be connected between phase line V and neutral line N;
The power input part of described the 3rd relay control unit divides and is connected to phase line U and neutral line N; After the coil series connection of the normally opened contact of the relay J of the 3rd relay control unit and A.C. contactor KM3, be connected between phase line W and neutral line N;
Neutral line N often opens main contacts ground connection by A.C. contactor KM4's;
The first switches set: A.C. contactor KM1 often open main contacts and first of A.C. contactor KM4 often open auxiliary contact in parallel after, then the first normally closed auxiliary contact of the A.C. contactor KM2 that connects is, the first normally closed auxiliary contact of A.C. contactor KM3;
Second switch group: A.C. contactor KM2 often open main contacts and second of A.C. contactor KM4 often open auxiliary contact in parallel after, then the first normally closed auxiliary contact of the A.C. contactor KM1 that connects is, the second normally closed auxiliary contact of A.C. contactor KM3;
The 3rd switches set: A.C. contactor KM3 often open main contacts and the 3rd of A.C. contactor KM4 often open auxiliary contact in parallel after, then the second normally closed auxiliary contact of the A.C. contactor KM1 that connects is, the second normally closed auxiliary contact of A.C. contactor KM2;
The input of described the first switches set is connected to phase line W, and the input of described second switch group is connected to phase line V, and the input of described the 3rd switches set is connected to phase line U; After the output parallel connection of described the first switches set, second switch group and the 3rd switches set, the coil by A.C. contactor KM4 is connected to neutral line N.
This device is also provided with malfunction indicator lamp L1 and run indicator L2: malfunction indicator lamp L1 and the 4th of A.C. contactor KM4 often drive auxiliary contact and connect after, be connected to phase line W(or phase line U, V) and neutral line N between; Run indicator L2 is connected to phase line W(or phase line U, V after connecting with the 5th normally closed auxiliary contact of A.C. contactor KM4) and neutral line N between.
After the metering device (band protection) of this device installation transformer outlet or on the first base three-phase four-wire system electric pole, also can be arranged on three-phase four-wire system end.Power consumption equipment, by any phase line and the neutral line, is inputted 220V alternating voltage.After the neutral line opens circuit, the voltage between phase line and the neutral line can raise.For example, when the voltage of phase line W is elevated to 280V left and right, the input power of the first relay control unit is after transformer T step-down, rectifying and wave-filtering, and direct voltage is added to triode BG1, make its conducting, the coil conducting of relay J, relay contact adhesive, the wire loop conducting of A.C. contactor KM1, make main contacts and the auxiliary contact action of A.C. contactor KM1, then connect the coil of A.C. contactor KM4, make the action of contactor KM4 contact self-insurance, the automatic tripping of A.C. contactor KM1.Contactor KM4 often leaves after main contacts action, and neutral line N connects over the ground, fills the disconnected neutral line, makes voltage return to 220V, to protect power consumption equipment.In phase line W, U, V, the voltage of a certain phase line is first elevated to 280V left and right, and corresponding relay control unit and switches set be action just, finally makes often opening after main contacts action of contactor KM4, and neutral line N connects over the ground.A.C. contactor KM1,2,3 use 10A coils are 380 volts, and the coil of A.C. contactor KM4 is 220 volts, and main contacts electric current is determined according to rated current and load current.Connect to neutral in A.C. contactor KM4 main contacts one end, other end welding system ground wire also can be installed separately earthing device.
Claims (1)
1. a three-phase alternating current electrical neutral axis broken circuit protecting equipment, is characterized in that, comprises
The first relay control unit: the primary coil of transformer T forms power input part and divides, the first end of secondary coil (1) is connected to the positive pole of diode D2, the negative pole of diode D2 is connected to the input of potentiometer W1, and the output of potentiometer W1 is connected to the collector electrode of triode BG1; Second end (2) of the secondary coil of transformer T is connected to the collector electrode of triode BG1; The centre tap of the secondary coil of transformer T (3) is connected to the positive pole of diode D1, and the negative pole of diode D1 is connected to the input of the coil of relay J, and the output of the coil of relay J is connected to the emitter of triode BG1; The base stage of triode BG1 is connected to the adjustable side of potentiometer W1 by rheostat W2; Between the collector electrode of the negative pole of diode D1 and triode BG1, be also connected with capacitor C 1, between the negative pole of diode D2 and the collector electrode of triode BG1, be also connected with capacitor C 2; Between the emitter and collector of triode BG1, be also in series with resistance R and LED;
The second relay control unit, the 3rd relay control unit are identical with the structure of the first relay control unit;
The power input part of described the first relay control unit divides and is connected to phase line W and neutral line N; After the coil series connection of the normally opened contact of the relay J of the first relay control unit and A.C. contactor KM1, be connected between phase line W and neutral line N;
The power input part of described the second relay control unit divides and is connected to phase line V and neutral line N; After the coil series connection of the normally opened contact of the relay J of the second relay control unit and A.C. contactor KM2, be connected between phase line V and neutral line N;
The power input part of described the 3rd relay control unit divides and is connected to phase line U and neutral line N; After the coil series connection of the normally opened contact of the relay J of the 3rd relay control unit and A.C. contactor KM3, be connected between phase line W and neutral line N;
Neutral line N often opens main contacts ground connection by A.C. contactor KM4's;
The first switches set: A.C. contactor KM1 often open main contacts and first of A.C. contactor KM4 often open auxiliary contact in parallel after, then the first normally closed auxiliary contact of the A.C. contactor KM2 that connects is, the first normally closed auxiliary contact of A.C. contactor KM3;
Second switch group: A.C. contactor KM2 often open main contacts and second of A.C. contactor KM4 often open auxiliary contact in parallel after, then the first normally closed auxiliary contact of the A.C. contactor KM1 that connects is, the second normally closed auxiliary contact of A.C. contactor KM3;
The 3rd switches set: A.C. contactor KM3 often open main contacts and the 3rd of A.C. contactor KM4 often open auxiliary contact in parallel after, then the second normally closed auxiliary contact of the A.C. contactor KM1 that connects is, the second normally closed auxiliary contact of A.C. contactor KM2;
The input of described the first switches set is connected to phase line W, and the input of described second switch group is connected to phase line V, and the input of described the 3rd switches set is connected to phase line U; After the output parallel connection of described the first switches set, second switch group and the 3rd switches set, the coil by A.C. contactor KM4 is connected to neutral line N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420244479.9U CN203883463U (en) | 2014-05-13 | 2014-05-13 | Three-phase alternating current neutral line open circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420244479.9U CN203883463U (en) | 2014-05-13 | 2014-05-13 | Three-phase alternating current neutral line open circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203883463U true CN203883463U (en) | 2014-10-15 |
Family
ID=51683931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420244479.9U Active CN203883463U (en) | 2014-05-13 | 2014-05-13 | Three-phase alternating current neutral line open circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203883463U (en) |
-
2014
- 2014-05-13 CN CN201420244479.9U patent/CN203883463U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202454840U (en) | Multipurpose delay power socket | |
| CN204190353U (en) | A kind of household electrical appliance automatic overvoltage power off device | |
| CN204361791U (en) | A kind of circuit structure of intelligent low-pressure distribution terminal | |
| CN101980405A (en) | Multi-purpose time delay power supply socket manufactured by using time base circuit | |
| CN203439864U (en) | Elevator control cabinet | |
| CN203883463U (en) | Three-phase alternating current neutral line open circuit protection device | |
| CN202694165U (en) | Automatic water tower controller | |
| CN205265226U (en) | High performance electric leakage electric cabinet | |
| CN204012645U (en) | Domestic overvoltage protection switch | |
| CN203617501U (en) | Special touch control type high-power power supply system for kitchen | |
| CN203301121U (en) | Protective circuit capable of adjusting rated voltage and rated current | |
| CN204314645U (en) | A kind of low-voltage distribution system by screen break-make automaton | |
| CN204333924U (en) | Pumping irrigation well electromotor integrated protection compensatory control case | |
| CN203368000U (en) | A motor three-phase circuit protector | |
| CN102570200A (en) | Multi-purpose delayed power socket | |
| CN202931271U (en) | Energy conservation safety switch | |
| CN201541113U (en) | Controller capable of automatic electricity restriction | |
| CN204517363U (en) | Electrical network lightning protection over-voltage automatic power-off control device | |
| CN203339651U (en) | Multifunctional air switch | |
| CN204462750U (en) | Ground signalling source | |
| CN105305373A (en) | Power network overvoltage automatic power-off control device | |
| CN203104082U (en) | UPS (uninterrupted power supply) device for electrical switch-on circuit of high-voltage relay switch | |
| CN204215633U (en) | Integral type Protection simulation training set | |
| CN202495737U (en) | Lightning-protection overvoltage automatic power-off controller used for electric appliance | |
| CN203434591U (en) | Security-isolation insulating power-off device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |