CN2286937Y - Over-voltage protection device for distribution power supply - Google Patents
Over-voltage protection device for distribution power supply Download PDFInfo
- Publication number
- CN2286937Y CN2286937Y CN 97209429 CN97209429U CN2286937Y CN 2286937 Y CN2286937 Y CN 2286937Y CN 97209429 CN97209429 CN 97209429 CN 97209429 U CN97209429 U CN 97209429U CN 2286937 Y CN2286937 Y CN 2286937Y
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- CN
- China
- Prior art keywords
- module
- surge
- power supply
- voltage protection
- utility
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- 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 - Lifetime
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Abstract
The utility model relates to an overvoltage protection device for a 380V distribution power supply. The circuit of the utility model adopts a modular structure, comprising three surge modules 1, a counting module 3, an alarm module 3, and a working power supply module 4, phase wires A, B, and C of the distribution power supply are respectively connected with a surge module, wherein, the surge module adopts a four terminal structure, two terminals are connected with distribution wires, and other two terminals are connected with a device to be protected. The utility model has the advantages of reliable operating performance, convenient operation, handling, maintenance, etc. The utility model can eliminate influence of voltage drop of lead wires on devices to be protected, and the devices to be protected can obtain better protection.
Description
The utility model is a kind of distribution power supply over-voltage protection device that is used for 380 volts of electric power systems.
Overvoltage protection in existing 380 volts of electric power systems is to be in series by discharging gap and carborundum valve block, perhaps adopts the metal oxide valve block after will encapsulating to be parallel to the structure fiery, ground wire of powering by lead-in wire.Its operation principle is: when overvoltage appears in supply line, and this device action, then big electric current is gone into ground through shunt leads and device, to realize the purpose of protection equipment.In use, there is following defective in the protective device of this structure: the one, do not eliminate pressure drop on the shunt leads to the influence of protected equipment, and cause this equipment to bear certain overvoltage, this equipment might damage when serious.This is because during device action, flows through pressure drop meeting that the big electric current of device produces and act on cause on the protected equipment along with the action of protective device on lead-in wire.The 2nd, the circuit of action counting and fault self-checking alarming is not set, cause the operation of protective device and maintenance to be made troubles.
The purpose of this utility model is to overcome above-mentioned prior art defective, provide a kind of easy to use and the maintenance distribution power supply over-voltage protection device, it can suppress the harm of overvoltage to equipment effectively.
The purpose of this utility model is achieved in that and is provided with excess voltage protection in the housing, and circuit adopts 3 surge modules and 1 counting, alarm, working power module, and distribution power supply A, B, C phase line respectively connect 1 surge module.Each surge module adopts four terminal structures, and wherein two-terminal is connected in the distribution line, and two-terminal connects protected equipment in addition.
After the utility model adopts the modularized circuit structure, following advantage is arranged:
One, owing to adopted the surge module of four terminal structures, eliminated the influence of the pressure drop on the lead-in wire to protected equipment, protected equipment is effectively protected.
Its two, be convenient to operation, operation and safeguard that this is because be provided with the result of action counting and fault self-checking alarming modular circuit.
Three, reliable working performance, easy to utilize.
The utility model is described in further detail below in conjunction with the embodiment accompanying drawing.
Fig. 1 is the connection diagram of the utility model and distribution power supply, protected equipment.
Fig. 2 is a surge modular circuit schematic diagram of the present utility model.
Fig. 3 is counting module circuit theory diagrams of the present utility model.
Fig. 4 is alarm module circuit theory diagrams of the present utility model.
In housing of the present utility model, be provided with the protective circuit of distribution overvoltage of power supply.The housing front is provided with switch, accident self-checking alarming lamp, counter etc.
As shown in Figure 1, circuit adopts modular construction, comprises 3 surge modules 1 and 1 counting module 2, accident self-checking alarming module 3, working power module 4.380 volts of distribution power supply A, B, C phase lines respectively connect a surge module.Each surge module adopts four terminal structures, and wherein two-terminal is connected in the distribution line, and two-terminal connects protected equipment in addition.Surge module and alarm module, both signalling channels link to each other.From the distribution power supply, appoint and to get a C phase line for example mutually, with working power module 4 and connect the C phase line and the N neutral line between, N line earth connection G.Power module circuitry is made of transformer and bridge rectifier, to 12 volts of DC power supply of alarm module 3 outputs.Counting module 2 has three groups of charging circuits, connects A, B, C phase line respectively, and by the electric capacity minus earth.
As shown in Figure 2, surge module 1 by release and the photoelectricity isolating monitoring circuit form.Leadage circuit is provided with 3-12 metal oxide pressure-sensitive device MOA that is connected in parallel on a phase line such as A line or B line or the C line, and its other end respectively connects the N line by a quick fuse F and goes into ground, and it is MOA that accompanying drawing has been drawn 4
1-MOA
4Dui Ying F with it
1-F
4The photoelectricity isolating monitoring circuit comprises photoisolator 01, light-emitting diode L
11, controllable silicon S
1, voltage-stabiliser tube W
11With diode Z
11, Z
12Deng parts, the input Z of this circuit
12Anodal phase-connecting wire, Z
11Anodal meet the serial connection point of MOA, F, i.e. Z by resistance R
11Positive pole passes through resistance R
11, R
12, R
13, R
14Meet MOA respectively
1With F
1, MOA
2With F
2, MOA
3With F
3, MOA
4With F
4Serial connection point (see figure 2).Drive part in photoisolator 01 and the alarm module 3, both holding wire J
1, J
2And connect.
As shown in Figure 3, counting module 2 is provided with charging, discharge, protection, rectification sum counter part.Live part is provided with three groups of series resistors, electric capacity, i.e. R
21Serial connection, C
21And R
22Serial connection, C
22And R
23Serial connection, C
23, they connect C, B, A phase line respectively, and connect the N line by the electric capacity negative pole and go into ground.Capacitance cathode respectively connects voltage-stabilizing protection, bridge rectifier part by resistance.Discharge portion is bleeder resistance R
27, R
27Be attempted by rectification output end, counter input.Counter can be used H
7The EC-BVLM model.
As shown in Figure 4, alarm module 3 is made up of driving and executive circuit.Drive part is by triode N
1, button S and peripheral components form.Operating part is by buzzer B
1, relay J, light-emitting diode L
31And L
32Form Deng device.
Operation principle of the present utility model is: when temporary overvoltage appears in the distribution power circuit, two terminals of transient state energy by surge module 1, promptly several be connected in parallel on the identical metal oxide pressure cell MOA of phase line and parameter and fast fuse F go into ground.Like this, protected equipment does not bear overvoltage, the surge module voltage when only bearing transient state energy and flowing through the surge module, thus protected protected equipment.
When temporary overvoltage occurring, counting module 2 charges to electric capacity by resistance, through bridge rectifier B
11The loop is to R
27Discharge promotes rolling counters forward in this process.
Arbitrary pressure cell, for example MOA in surge module 1
4Break down, cause quick fuse F
4During fusing, controllable silicon S then
1Conducting, exciting light electric isolator 01 makes holding wire J
1, J
2Between conducting, cause triode N in the alarm module 3
1Conducting promotes buzzer B
1Sounding alarm, light-emitting diode L at this moment
31Brighten L by going out
32Go out by bright change, thereby realize the fault self-checking alarming function.
Claims (4)
1, a kind of distribution power supply over-voltage protection device; be provided with excess voltage protection in its housing; it is characterized in that excess voltage protection adopts modular construction; comprise 3 surge modules (1) and 1 counting module (2), alarm module (3), working power module (4); distribution power supply A, B, C phase line respectively connect a surge module; the surge module adopts four terminal structures, and wherein two-terminal is connected in the distribution line, and two-terminal connects protected equipment in addition.
2, protective device according to claim 1; it is characterized in that surge module (1) by release and the photoelectricity isolating monitoring circuit form; leadage circuit is provided with 3-12 metal oxide pressure-sensitive device that is connected in parallel on a phase line; respectively by a quick fuse ground connection, photoelectricity isolating monitoring circuit input is connected in parallel on the pressure-sensitive device two ends to its other end.
3, protective device according to claim 1; it is characterized in that counting module (2) is provided with charging, discharge, protection, rectification sum counter part; live part is provided with three groups of series resistors, electric capacity; every group connects a phase line and passes through the electric capacity minus earth, and discharge portion is by the resistance R that is attempted by counter
27Constitute.
4, protective device according to claim 1 is characterized in that alarm module (3) is by driving and executive circuit is formed the signal termination photoisolator signal end of drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97209429 CN2286937Y (en) | 1997-03-10 | 1997-03-10 | Over-voltage protection device for distribution power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97209429 CN2286937Y (en) | 1997-03-10 | 1997-03-10 | Over-voltage protection device for distribution power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2286937Y true CN2286937Y (en) | 1998-07-29 |
Family
ID=33928620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97209429 Expired - Lifetime CN2286937Y (en) | 1997-03-10 | 1997-03-10 | Over-voltage protection device for distribution power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2286937Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101853554A (en) * | 2010-04-29 | 2010-10-06 | 成都军通通信股份有限公司 | Fireproofing pre-warning monitoring method for unmanned base station and system thereof |
-
1997
- 1997-03-10 CN CN 97209429 patent/CN2286937Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101853554A (en) * | 2010-04-29 | 2010-10-06 | 成都军通通信股份有限公司 | Fireproofing pre-warning monitoring method for unmanned base station and system thereof |
| CN101853554B (en) * | 2010-04-29 | 2012-09-12 | 卢代高 | Fireproofing pre-warning monitoring method for unmanned base station and system thereof |
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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 | ||
| CX01 | Expiry of patent term |