CN201532431U - Indicating alarm detecting the residual current on-line - Google Patents
Indicating alarm detecting the residual current on-line Download PDFInfo
- Publication number
- CN201532431U CN201532431U CN2009202461844U CN200920246184U CN201532431U CN 201532431 U CN201532431 U CN 201532431U CN 2009202461844 U CN2009202461844 U CN 2009202461844U CN 200920246184 U CN200920246184 U CN 200920246184U CN 201532431 U CN201532431 U CN 201532431U
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- residual current
- alarming
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Abstract
The utility model provides an indicating alarm detecting the residual current on-line. The detecting alarm is composed of a zero sequence current transformer, an amplification circuit, a milliampere meter, a photocoupler, an alarming electric circuit, wherein all of detected line conductors penetrate through the zero sequence current transformer; the milliampere meter indicates the residual current value of the detected lines; when the residual current value of the detected lines is less than predetermined alarming value, the photocoupler is powered off and the alarming circuit does not work. When the residual current value of the detected lines is less than predetermined alarming value, the photocoupler is powered on, the alarming circuit works to send out an acousto-optical alarming signal. When the residual current of the detected lines is more than the motion value of the residual current motion protector and it is in tripping operation and power failure, the photocoupler is powered off and a thyristor in the alarming circuit is conductive all the time to send out the alarming signal; and it is possible to release the alarm only pressing down an alarming releasing press button.
Description
Technical field
The utility model belongs to warning device, relates in particular to a kind of warning device that detects residual current
Background technology
Present low voltage electric network adopts the installation RCD to prevent personal single-phase electric shock and the fire failure because of leaking electricity and taking place.Its principle is when the three-phase imbalance leakage current in the low voltage electric network reaches the RCD working value, and it can cut off the electricity supply in the driving switch tripping operation, thereby protects personal device security.
At present, the residual current protecting of low voltage electric network has three kinds of modes; Be divided into one, two, three residual current protecting, wherein the one-level RCD is installed on the switchboard (screen), and protection domain is the fault of in time excising the big residual currents of generation such as ground connection that break on low voltage electric network backbone and the branch line circuit.The secondary residual current action breaker is installed in the panel box of electric energy meter collection dress, the fault of the residual current that the electric leakage broken string ground connection on the protection house lead in etc. produces.Three grades of residual current action breakers are installed in user's receptor site end, and the scope of protection is to prevent that user's built-in electrical insulation from destroying, taking place the accidents that residual current caused such as personal indirect contact electric shock.
Though low voltage electric network adopts one, two, three residual current protecting mode, can effectively prevent personal single-phase electric shock and fire failure because of leaking electricity and taking place.But RCD requires the low voltage electric network dielectric level higher, if the line facility insulation impedance is lower, makes the three-phase imbalance leakage current bigger, and RCD can not normally be put into operation.So this just need carry out online detection to the three-phase imbalance leakage current of low-voltage circuit, so that carry out the maintenance of line facility, eliminate the leak current fault point, RCD is normally moved.
At present,, the one-level RCD that has shows though being provided with residual current,, what it detected is the whole residual current of low-voltage power grid of power distribution station.Because the scope that the one-level RCD detects is wider, the leak current fault point range of line facility be can not determine, after RCD shows that residual current of low-voltage power grid or residual current reach the working value tripping operation.The staff can only blindly remove to search the leak current fault point, increases the working time of searching the trouble spot, has also prolonged power off time, has reduced the power supply reliability of low voltage electric network.
Present two, three grades of residual current circuit breakers all are not provided with the residual current indication; exist and to see intuitively that each section line facility of being protected because of insulation impedance reduces the less leakage current that causes, makes the lower line equipment of some insulation impedances can not get timely processing.Can only after reaching the working value tripping operation of RCD, leakage current just go to search processing.
Summary of the invention
For solving above-mentioned existing in prior technology weak point; the purpose of this utility model provide a kind of for make the staff can in time find with processing circuitry equipment on the online detection residual current indication alarm of leak current fault point; improve the dielectric level of low voltage electric network, guarantee the normal operation of residual current operated protective device.
Described online detection residual current indication alarm is realized by following scheme: this detection alarm device is made up of zero sequence current mutual inductor, amplifying circuit, milliammeter, photoelectrical coupler, warning electronic circuit, wherein, detected line wire should all pass zero sequence current mutual inductor, residual electricity flow valuve by the detected circuit of milliammeter indication, when the residual electricity flow valuve of detected circuit during less than the alarming value set, photoelectrical coupler ends, and warning circuit is not worked.When the residual electricity flow valuve of detected circuit during greater than the alarming value set, photoelectrical coupler conducting, the sound and light alarm signal is sent in warning circuit work.After of the working value tripping operation power failure of detected circuit residual current greater than RCD; photoelectrical coupler ends, and thyristor conducting all the time in the warning circuit at this moment keeps alerting signal to send; have only the releasing alarm button is pressed, could remove alarm.
Grasp and understand the residual current of each section circuit for the ease of the staff, dwindle the scope of searching leak current fault point, should on each branch line of low voltage electric network and branched line, online detection residual current be installed and indicate alarm to see figure.Online residual current detects the practicality of indication alarm, the management specific responsibility people of power distribution station is regularly to the line facility walkaround inspection time, the online residual current detection indication alarm that reply is installed pursues platform and checks, when the residual electricity flow valuve reaches 30mA and when above, should in time investigate and prosecute the leak current fault point in this branch line service area.Check the ruuning situation of two, three grades of residual current circuit breakers installing on this branch line simultaneously, that finds the releasing damage should in time handle replacing.
Behind the one-level RCD would trip of switchboard (screen), the management of power distribution station specific responsibility people, the residual current detection alarm device of tackling on each branch line pursues the platform inspection, finds that online residual current detects when indicating alarm that alerting signal is arranged; At first remove and report to the police, and faulty line is disconnected; The master switch that closes is then powered to All other routes.After the All other routes power supply is normal.Search the leakage of faulty line again, after pending fault point is handled, recover this branch line power supply.
If behind one-level RCD would trip, when each online detection residual current indication alarm does not all send alerting signal, leak current fault will occur on the basic routing line so.The leak current fault point that the staff tackles on the basic routing line is investigated and prosecuted.
Compared with prior art, advantage of the present utility model is: this apparatus structure is simple, easy to be made, conveniently uses, and has some functions that RCD does not have.It does not influence the installation and operation of RCD, can onlinely see the residual current in the low voltage electric network each branch line and the branch line, and the staff is in time handled the leak current fault point, eliminates safe hidden trouble.Behind one-level RCD would trip, can send the leakage-current alarm signal again, leak current fault takes place in certain section circuit of indication low voltage electric network, made things convenient for the investigation of staff to leak current fault point, also can shorten the power off time of low voltage electric network.
Description of drawings
Fig. 1 is an online detection residual current indication alarm theory structure synoptic diagram described in the utility model.
The 1-zero sequence current mutual inductor, 2-amplifying circuit, 3-milliammeter, 4-photoelectrical coupler, 5-warning electronic circuit.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model is described in further detail, but not as the restriction to technical solutions of the utility model.
Referring to Fig. 1, described online detection residual current indication alarm is made up of zero sequence current mutual inductor 1, amplifying circuit 2, milliammeter 3, photoelectrical coupler 4, warning electronic circuit 5, wherein, described zero sequence current mutual inductor 1 connects amplifying circuit 2, milliammeter 3 is arranged on the amplifying circuit 2, and photoelectrical coupler 4 is coupled amplifying circuit 2 and warning electronic circuit 5.Detected line wire 6 should all pass zero sequence current mutual inductor 1, and by the residual electricity flow valuve of the detected circuit of milliammeter 3 indication, when the residual electricity flow valuve of detected circuit during less than the alarming value set, photoelectrical coupler 4 ends, and warning circuit is not worked.When the residual electricity flow valuve of detected circuit during greater than the alarming value set, photoelectrical coupler 4 conductings, the sound and light alarm signal is sent in warning circuit work.After of the working value tripping operation power failure of detected circuit residual current greater than RCD; photoelectrical coupler 4 ends, and thyristor conducting all the time in the warning circuit at this moment keeps alerting signal to send; have only the releasing alarm button is pressed, could remove alarm.
Online residual current detects the practicality of indication alarm, the management specific responsibility people of power distribution station is regularly to the line facility walkaround inspection time, the online residual current detection indication alarm that reply is installed pursues platform and checks, when the residual electricity flow valuve reaches 30mA and when above, should in time investigate and prosecute the leak current fault point in this branch line service area.Check the ruuning situation of two, three grades of residual current circuit breakers installing on this branch line simultaneously, that finds the releasing damage should in time handle replacing.
Behind the one-level RCD would trip of switchboard (screen), the management of power distribution station specific responsibility people, the residual current detection alarm device of tackling on each branch line pursues the platform inspection, finds that online residual current detects when indicating alarm that alerting signal is arranged; At first remove and report to the police, and faulty line is disconnected; The master switch that closes is then powered to All other routes.After the All other routes power supply is normal.Search the leakage of faulty line again, after pending fault point is handled, recover this branch line power supply.
If behind one-level RCD would trip, when each online detection residual current indication alarm does not all send alerting signal, leak current fault will occur on the basic routing line so.The leak current fault point that the staff tackles on the basic routing line is investigated and prosecuted.
The utility model is not limited to the foregoing description; to those skilled in the art, any conspicuous improvement that the foregoing description of the present utility model is made or change can not exceed the embodiment of the present utility model that only illustrates by way of example and the protection domain of claims.
Claims (2)
1. an online detection residual current is indicated alarm, comprise zero sequence current mutual inductor (1), amplifying circuit (2), milliammeter (3), photoelectrical coupler (4), warning electronic circuit (5) composition, it is characterized in that: described zero sequence current mutual inductor (1) connects amplifying circuit (2), and photoelectrical coupler (4) is coupled amplifying circuit (2) and warning electronic circuit (5).
2. a kind of online detection residual current indication alarm according to claim 1, it is characterized in that: described milliammeter (3) is arranged on the amplifying circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202461844U CN201532431U (en) | 2009-11-04 | 2009-11-04 | Indicating alarm detecting the residual current on-line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202461844U CN201532431U (en) | 2009-11-04 | 2009-11-04 | Indicating alarm detecting the residual current on-line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201532431U true CN201532431U (en) | 2010-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202461844U Expired - Fee Related CN201532431U (en) | 2009-11-04 | 2009-11-04 | Indicating alarm detecting the residual current on-line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201532431U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931802A (en) * | 2015-03-26 | 2015-09-23 | 广东电网有限责任公司江门供电局 | Outgoing line load three-phase integration protection, regulation and control method |
| CN105067872A (en) * | 2015-09-14 | 2015-11-18 | 国网浙江杭州市富阳区供电公司 | Single-phase residual electricity quantity signal trigger and monitoring method |
-
2009
- 2009-11-04 CN CN2009202461844U patent/CN201532431U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931802A (en) * | 2015-03-26 | 2015-09-23 | 广东电网有限责任公司江门供电局 | Outgoing line load three-phase integration protection, regulation and control method |
| CN105067872A (en) * | 2015-09-14 | 2015-11-18 | 国网浙江杭州市富阳区供电公司 | Single-phase residual electricity quantity signal trigger and monitoring method |
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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: 20100721 Termination date: 20121104 |