CN201194325Y - Over voltage protector for zero line open loop - Google Patents
Over voltage protector for zero line open loop Download PDFInfo
- Publication number
- CN201194325Y CN201194325Y CNU2008200116506U CN200820011650U CN201194325Y CN 201194325 Y CN201194325 Y CN 201194325Y CN U2008200116506 U CNU2008200116506 U CN U2008200116506U CN 200820011650 U CN200820011650 U CN 200820011650U CN 201194325 Y CN201194325 Y CN 201194325Y
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- zero line
- pin
- line
- open circuit
- 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.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a zero line open circuit overvoltage protector, which solves the problem that user electric appliances are burnout, due to the open circuit of the zero line or misconnection of the front line in electric network. A variable resistor and the primary coil of an isolation transformator are serially connected between the zero line and the front line, the input terminal of a bride rectifier is connected to a power source, one end of the output terminal is earthed, the other end is connected to the 8 pin of the an operational amplifier via a resistor, the 3 pin of the operational amplifier is earthed, the two ends of the secondary coil of the isolation transformator are respectively connected to the 1 and 2 pins of the operational amplifier, the 7 pin of the operational amplifier is connected to the control pole of a controllable silicon, the anode of the controllable silicon is connected to the connecting line between the bridge rectifier and a resistor R, the cathode of the controllable silicon is connected to one end of a magnet coil, and the other end of the magnet coil is earthed. When the zero line is in open circuit state, the device is capable of rapidly cutting off the power supply, thus protecting electric appliances. The zero line open circuit overvoltage protector has small volume, simple line, low cost and high operation reliability.
Description
Technical field
The utility model belongs to the emergency protective circuit device, particularly the protector that overvoltage is reacted.
Background technology
Current in the three-phase and four-line low-voltage network, the zero line of electric power system is opened a way because factor such as natural, artificial makes, the zero line loose contact, cause that supply power voltage raises, cause load neutral point generation skew when three-phase load is uneven, the terminal voltage of loading light raises, the terminal voltage that load is heavy reduces, thereby causes user's power consumption equipment to burn out.
In addition, zero line break also makes the protective effect of the electric equipment forfeiture protection connecting to neutral behind the trip point.Work as zero line break, and a certain electric equipment in trip point back bumps shell when electric leakage, be connected on behind the trip point all electric equipment shells all can with on be equivalent to the voltage to earth of phase voltage, in case human body contacts these electric equipment shells, the casualty accident of will getting an electric shock.After accident took place, local power supply department was responsible for repairing or the reparations to burning electrical equipment.Like this, not only cause enormous economic loss, and the cost great amount of manpower and material resources solves the dispute with the user, also bring passive situation for simultaneously our good service work to power supply enterprise.
The content of utility model
In order to solve zero line open circuit because of electric power system, cause that voltage raises, the problem that causes consumer electronics to burn proposes following technical scheme.In the inner protective circuit that embeds of original air switch, detect the voltage signal between zero line and ground wire.When zero line open circuit or misconnection live wire, when the zero line loose contact causes overvoltage, open circuit, protection power consumption equipment.Concrete structure is as follows:
Zero line open circuit overvoltage protector; its special character is the main coil of series connection variable resistor and isolating transformer between zero line and ground wire; constitute the input loop; the input termination phase line of power and the zero line of bridge rectifier; one end ground connection of its output; the other end connects 8 pin of operational amplifier by resistance; 3 pin ground connection of operational amplifier; for operational amplifier provides power supply; the two ends of the secondary coil of isolating transformer connect 1 of operational amplifier respectively; 2 pin; 7 pin of operational amplifier connect the silicon controlled control utmost point; the silicon controlled anode is connected on the line between bridge rectifier and the resistance; the silicon controlled negative electrode connects an end of solenoid, the other end ground connection of solenoid.
Circuit of the present utility model is work like this: at first adjust variable-resistance resistance, make the sensitivity of this device reach predetermined value.When the zero line in the electrical network is opened a way, produce potential difference between zero line and the ground wire, in variable resistor and isolating transformer, produce electric current, the main coil two ends of isolating transformer produce pressure reduction, this pressure reduction outputs signal to the silicon controlled control utmost point by 7 pin of operational amplifier after operational amplifier amplifies, the controllable silicon conducting makes solenoid work, solenoid produces magnetic force and drives the interior disconnecting link K action of former air switch J, cuts off the electricity supply.
This device is installed in user's electric energy meter rear side, and controllable silicon wherein and solenoid place in the air beginning J.When the zero line in the electrical network is opened a way, can cut off the electricity supply protection user's electric equipment.This device volume is little, and circuit is simple, the functional reliability height.
Description of drawings
Accompanying drawing is the line map of embodiment.
Embodiment
Embodiment
A kind of zero line open circuit overvoltage protector, its between zero line N and ground wire PE, connect variable resistor R of 500 Ω
XMain coil with isolating transformer T, constitute the input loop, the input termination phase line of power L and the zero line N of the bridge rectifier D of forming by four diodes 4008, one end ground connection of its output, the other end connects 8 pin of operational amplifier Y by the resistance R of 120K, the 3 pin ground connection of operational amplifier Y, Y provides power supply for operational amplifier, the two ends of the secondary coil of isolating transformer T meet 1 of operational amplifier Y respectively, 2 pin, 7 pin of operational amplifier Y connect the control utmost point of controllable silicon ICR, the anode of controllable silicon ICR is connected on the line between bridge rectifier D and the resistance R, and the negative electrode of controllable silicon ICR connects the end of solenoid W, the other end ground connection of solenoid W.In addition, for this device being tested the main coil of tandem test button S and isolating transformer T between phase line L and ground wire PE.The model of operational amplifier Y is that the number of LW54123, isolating transformer T is BT169 than the model for 5:1, controllable silicon ICR.On behalf of former air switch, K, J represent disconnecting link, B representative to be made up of input loop and bridge rectifier and operational amplifier etc. among the figure protective circuit, F represent load.
Claims (1)
1. zero line open circuit overvoltage protector; the main coil that it is characterized in that between zero line and ground wire series connection variable resistor and isolating transformer; constitute the input loop; the input termination phase line of power and the zero line of bridge rectifier; one end ground connection of its output; the other end connects 8 pin of operational amplifier by resistance; 3 pin ground connection of operational amplifier; for operational amplifier provides power supply; the two ends of the secondary coil of isolating transformer connect 1 of operational amplifier respectively; 2 pin; 7 pin of operational amplifier connect the silicon controlled control utmost point; the silicon controlled anode is connected on the line between bridge rectifier and the resistance; the silicon controlled negative electrode connects an end of solenoid, the other end ground connection of solenoid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200116506U CN201194325Y (en) | 2008-03-20 | 2008-03-20 | Over voltage protector for zero line open loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200116506U CN201194325Y (en) | 2008-03-20 | 2008-03-20 | Over voltage protector for zero line open loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201194325Y true CN201194325Y (en) | 2009-02-11 |
Family
ID=40393857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200116506U Expired - Fee Related CN201194325Y (en) | 2008-03-20 | 2008-03-20 | Over voltage protector for zero line open loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201194325Y (en) |
-
2008
- 2008-03-20 CN CNU2008200116506U patent/CN201194325Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090211 |