CN201138736Y - Residual current protecting equipment added with zero sequence current monitoring apparatus - Google Patents
Residual current protecting equipment added with zero sequence current monitoring apparatus Download PDFInfo
- Publication number
- CN201138736Y CN201138736Y CNU2007203121802U CN200720312180U CN201138736Y CN 201138736 Y CN201138736 Y CN 201138736Y CN U2007203121802 U CNU2007203121802 U CN U2007203121802U CN 200720312180 U CN200720312180 U CN 200720312180U CN 201138736 Y CN201138736 Y CN 201138736Y
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- zero
- sequence current
- supervising device
- aftercurrent
- impedor
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Abstract
The utility model discloses a residual current protection device with adding a zero sequence current monitoring device, which comprises a residual current operated protective relay, a current detector connecting with the residual current operated protective relay and a tripping mechanism connecting at the output terminal of the residual current operated protective relay. The tripping mechanism is used to carry out the automatic tripping control of the low voltage distribution output circuit. The utility model also comprises a zero sequence current monitoring device coordinating with the residual current operated protective relay. Compared with prior art, adopting two measures of earth fault protection causes the residual current protection device with adding a zero sequence current monitoring device to have the advantages of the reasonable structure and the reliable use.
Description
Technical field
The utility model relates to a kind of electric device, particularly a kind of Aftercurrent protecting equipment that is applicable in the low-voltage distributing line.
Background technology
For preventing that the person from touching the electrical fire accident that live metal conductor electric shock injures and deaths and phase line metallic short circuit earth fault cause indirectly, guarantees the thermal stability in circuit, the equipment operation.Relevant specifications such as the existing electrical design of China, construction have all proposed to be provided with earth fault protection in low-voltage distributing line.IEC755 of International Electrotechnical Commission " aftercurrent action protecting equipment generally requires " and standard GB 6829-95 " RCD generally requires " have clearly stipulated technical indicator and requirement.Standard GB 13955-2005 " aftercurrent action protecting equipment installation and operation " has also stipulated the relevant requirements of selection, installation, operational management.Given this, various types of aftercurrent action protecting equipments generally have been installed both at home and abroad in low-voltage distributing line.Yet, they but do not reach the effect of anticipation in actual motion, for example: (1) is when circuit generation phase line metallic short circuit earth fault, the size of current in this loop depends on the earth resistance and the electric resistance of soil of protective earthing line, the phase line ground connection just easy electrical fire that produces of moment; (2) if the person touches the metal tape electric conductor, the voltage that human body bore is the phase line above earth potential, size of current by human body depends on human body self condition (age, height, body weight) and electric shock environmental condition (in high-altitude, the water, air humidity etc.), could guarantee that personal safety is also relevant with the switching speed of trip circuit, that is to say that the moment of touching energized conductor when human body will be subjected to electric shock.These earth fault currents also will cause the tripping operation of Aftercurrent protecting equipment frequent movement, the reliability of influence power supply.
By above-mentioned analysis, existing Aftercurrent protecting equipment has tangible technical performance defective: the technical performance imperfection, and when circuit generation phase line metallic short circuit earth fault, the earth fault loop current is bigger, the ground connection just easy electrical fire that produces of moment; When the person touched energized conductor, higher by the voltage of human body, electric current is bigger, the moment of getting an electric shock will be subjected to electric shock, can not realize direct contact protection.
Summary of the invention
In order to solve the above problems, the purpose of this utility model is to provide a kind of rational in infrastructure, Aftercurrent protecting equipment that service-strong is set up the zero-sequence current supervising device.
The technical scheme that the invention for solving the technical problem adopted is:
A kind of Aftercurrent protecting equipment of setting up the zero-sequence current supervising device comprises the aftercurrent action protecting relay; The current detector that is connected with the aftercurrent action protecting relay; And being connected tripping mechanism on the residual current protecting relay output end, this tripping mechanism is used for the low-voltage distribution outlet line is carried out automatic trip control; Also include the zero-sequence current supervising device that is used with the aftercurrent action protecting relay, an end of zero-sequence current supervising device is used to be connected distribution transformer low-pressure side neutral point, and the other end is used to be connected the working earthing line of distribution transformer.
Wherein, as the execution mode of the invention, described tripping mechanism can be A.C. contactor or a circuit breaker of carrying out terminal.
Further, described zero-sequence current supervising device comprises zero-sequence current impedor and lightning protection device, the zero-sequence current impedor comprises that annular core and electromagnetic wire are around the winding on it, the former limit winding of lightning protection device and zero-sequence current impedor is connected in parallel, the head end of zero-sequence current impedor is used to connect the neutral line of low-voltage distributing line, and tail end is used to connect distribution transformer working earthing line.
Described zero-sequence current supervising device also includes indicating instrument, and this indicating instrument is connected on the secondary winding of zero-sequence current impedor.
The beneficial effects of the utility model are: because the Aftercurrent protecting equipment of the invention has been set up the zero-sequence current supervising device that is used with the aftercurrent action protecting relay; adopt two kinds of measures of earth fault protection, make it to have following effect compared with prior art:
1, technical performance is more perfect, when circuit normally moves, the person touch energized conductor the shock current by human body be safe current, Aftercurrent protecting equipment need not move, and can guarantee personal electric shock safety under the situation of not stopping power supply; When phase line metallic short circuit ground connection, the utility model also can be controlled the earth fault loop current, avoids the generation of electrical fire accident.
2, reduce leakage loss, directly monitoring circuit insulation against ground reduces the line-to-ground Leakage Current, can reduce the loss of electrical network Leaked Current of Line to Ground greatly.
3, improved the reliability of power supply, the zero-sequence current supervising device makes Aftercurrent protecting equipment reduce supply line's tripping operation probability greatly to the direct supervisory function bit of earth fault current.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is principle of the present utility model and application winding diagram,
Fig. 2 is the utility model zero-sequence current impedor supervising device structural circuit figure.
Embodiment
With reference to Fig. 1, a kind of execution mode of setting up the Aftercurrent protecting equipment of zero-sequence current supervising device of the present utility model comprises aftercurrent action protecting relay 104; The current detector 102 that is connected with aftercurrent action protecting relay 104; And being connected tripping mechanism on the residual current protecting relay output end, this tripping mechanism is used for the low-voltage distribution outlet line is carried out automatic trip control; Also include the zero-sequence current supervising device 105 that is used with aftercurrent action protecting relay 104; one end of zero-sequence current supervising device 105 is used to be connected distribution transformer low-pressure side neutral point, and the other end is used to be connected the working earthing line of distribution transformer.Wherein, described tripping mechanism can be to carry out terminal A.C. contactor or circuit breaker 103.
With reference to Fig. 2, as preferred implementation of the present utility model, described zero-sequence current supervising device 105 comprises zero-sequence current impedor 201 and lightning protection device 202, zero-sequence current impedor 201 comprises that annular core and electromagnetic wire are around the winding on it, lightning protection device 202 is connected in parallel with the former limit winding L 1 of zero-sequence current impedor 201, the head end of zero-sequence current impedor 201 is used to connect the neutral line of low-voltage distributing line, and tail end is used to connect distribution transformer working earthing line.
Further, described zero-sequence current supervising device 105 also includes indicating instrument 204, this indicating instrument 204 is connected on the secondary winding 203 of zero-sequence current impedor, and secondary winding 203 is connected on the zero-sequence current impedor tail end earth connection 205 after contacting with indicating instrument 204.Indicating instrument 204 is to be used for the actual over the ground Leakage Current situation of circuit, can design green tape place of safety and red tape hazardous area.
In conjunction with Fig. 1 and Fig. 2; Aftercurrent protecting equipment of the present utility model in use; when the low-voltage distributing line insulation level meets the requirement (greater than 0.5 megaohm) of GB13955-2005 " aftercurrent action protecting equipment installation and operation " when normally putting into operation; the D.C. resistance of zero-sequence current supervising device 105 is very little; setting is less than or equal to 2.5 ohm; the extremely near solidly grounded system of low voltage electric network this moment; when if low voltage electric network insulation decline suddenly or phase line metallic short circuit earth fault and the person touch the live metal conductor; zero sequence electricity supervising device 105 presents high impedance; (resistance value moment increases 10000 times between the neutral line and the ground wire 106 more than or equal to 25 kilohms in setting; promptly be equivalent to import high resistance between over the ground at electrical network), low voltage electric network is indirect earthed system.If electrical network is a phase line metallic short circuit earth fault, the earth fault loop current will be subjected to the restriction of zero-sequence current supervising device 105 high impedances, can not produce spark and cause electrical fire.Aftercurrent action protecting relay 104 can be dealt with to carrying out terminal A.C. contactor or circuit breaker 103 in the operating current value scope of adjusting; if electrical network earth fault is touched energized conductor for the person 107; the voltage that human body 107 is born is the dividing potential drop of zero-sequence current supervising device high impedance and earth resistance and human body resistance; generally should be less than 30 volts; electric current by human body is the shunting of zero-sequence current supervising device high impedance and earth resistance and human body resistance, generally should be less than 10 milliamperes.Obvious; when the accident of human electric shock is taken place; the voltage and current that human body bore is safe voltage and the electric current that human body can tolerate or break away from; aftercurrent action protecting relay 104 need not carried out tripping operation and cut off the electricity supply; personal electric shock casualty accident also can not take place; and can in low-voltage distributing line, realize direct contact protection, make its technical performance more perfect.
When producing abnormal overvoltage in the low-voltage distributing line, because lightning protection device 202 inner pressure sensitive effects can be eliminated, and thunder and lightning is introduced the earth.
Indicating instrument 204 is to be used for the actual over the ground Leakage Current situation of circuit, when the indicating instrument indication is the safe operation district at the green line zone, indication is dangerous Operational Zone at the red line zone, the electrician management personnel are according to the indicating status of indicating instrument, whether judgement rebuilds circuit, accomplishes to nip in the bud.
Zero-sequence current impedor supervising device can effectively reduce the line tripping frequency to the direct supervisory function bit of circuit, has improved the reliability of power supply.By the zero-sequence current supervising device, the size and the path of monitoring in real time, control three-phase load imbalance and the uneven zero-sequence current that produces of three-phase insulation against ground reach wastage reducing and energy saving, avoid the purpose of the electrical fire that phase line short circuit ground connection causes.
Certainly, the invention is not limited to above-mentioned execution mode, as long as it reaches technique effect of the present utility model with essentially identical means, all should belong to protection range of the present utility model.
Claims (4)
1, a kind of Aftercurrent protecting equipment of setting up the zero-sequence current supervising device comprises aftercurrent action protecting relay (104); The current detector (102) that is connected with aftercurrent action protecting relay (104); And being connected tripping mechanism on the residual current protecting relay output end, this tripping mechanism is used for the low-voltage distribution outlet line is carried out automatic trip control;
It is characterized in that: also include the zero-sequence current supervising device (105) that is used with aftercurrent action protecting relay (104); one end of zero-sequence current supervising device (105) is used to be connected distribution transformer low-pressure side neutral point, and the other end is used to be connected the working earthing line of distribution transformer.
2, a kind of Aftercurrent protecting equipment of setting up the zero-sequence current supervising device according to claim 1 is characterized in that: described tripping mechanism is to carry out terminal A.C. contactor or circuit breaker.
3, a kind of Aftercurrent protecting equipment of setting up the zero-sequence current supervising device according to claim 1; it is characterized in that: described zero-sequence current supervising device (105) comprises zero-sequence current impedor (201) and lightning protection device (202); zero-sequence current impedor (201) comprises that annular core and electromagnetic wire are around the winding on it; lightning protection device (202) is connected in parallel with the former limit winding of zero-sequence current impedor (201); the head end of zero-sequence current impedor (201) is used to connect the neutral line of low-voltage distributing line, and tail end is used to connect distribution transformer working earthing line.
4, a kind of Aftercurrent protecting equipment of setting up the zero-sequence current supervising device according to claim 3; it is characterized in that: described zero-sequence current supervising device (105) also includes indicating instrument (204), and this indicating instrument (204) is connected on the secondary winding of zero-sequence current impedor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203121802U CN201138736Y (en) | 2007-12-26 | 2007-12-26 | Residual current protecting equipment added with zero sequence current monitoring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203121802U CN201138736Y (en) | 2007-12-26 | 2007-12-26 | Residual current protecting equipment added with zero sequence current monitoring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201138736Y true CN201138736Y (en) | 2008-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007203121802U Expired - Fee Related CN201138736Y (en) | 2007-12-26 | 2007-12-26 | Residual current protecting equipment added with zero sequence current monitoring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201138736Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532676A (en) * | 2017-01-06 | 2017-03-22 | 杨文强 | Magnetic induction ground blanking device |
-
2007
- 2007-12-26 CN CNU2007203121802U patent/CN201138736Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532676A (en) * | 2017-01-06 | 2017-03-22 | 杨文强 | Magnetic induction ground blanking device |
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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: 20081022 Termination date: 20101226 |