CN100442617C - Human body electrification protecting method and apparatus for small current system - Google Patents
Human body electrification protecting method and apparatus for small current system Download PDFInfo
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- CN100442617C CN100442617C CNB2005100460595A CN200510046059A CN100442617C CN 100442617 C CN100442617 C CN 100442617C CN B2005100460595 A CNB2005100460595 A CN B2005100460595A CN 200510046059 A CN200510046059 A CN 200510046059A CN 100442617 C CN100442617 C CN 100442617C
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- 230000002633 protecting effect Effects 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000006378 damage Effects 0.000 description 5
- 238000010891 electric arc Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 210000004556 brain Anatomy 0.000 description 1
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Abstract
The present invention relates to a protecting method and a device for preventing human body electrification in a small-current system, which adopts an intelligent microcomputer controller to collect the voltage of a transformer station in real time, judges whether the system is grounded or has grounding phase, and sends an instruction for closing a breaker of the grounding phase to a split-phase breaker; one end of the split-phase breaker is connected with the bus of the transformer station through a isolating switch, and the other end of which is connected with a grounding device, the split-phase breaker is actuated and can make the grounding phase grounded repeatedly and quickly within 0.05 to 0.2 seconds, and a current transformer is connected to a control loop, once a double phase ground fault occurs, the protecting device for preventing human body electrification in the small-current system is made to withdraw. The device is composed of the intelligent microcomputer controller, the split-phase breaker and the current transformer, and has the advantages that the device realizes the effective protection for persons from electrification, has the protecting effects on equipment of the system and fault equipment, prevents complete shutdown, avoids the misoperation of the device, ensures that the split-phase breaker realizes phase operation, and can prevent the system from resulting in line tripping operation when successive different phase grounding faults occur.
Description
Technical field
The present invention is used for electric power system and prevents the human body electrification technical field, particularly a kind of small current system human body electrification protecting method and device.
Background technology
In power supply system, in, closely generally adopt 10KV, 35KV, 66KV supply network, and adopt isolated neutral or through the operational mode of grounding through arc, system protection does not act on circuit breaker trip during this mode generation single phase ground fault.When human body electrification takes place when, be generally single-phase electrification over the ground, system's capacitive earth current passes through human body, because voltage is higher, electric arc can't extinguish, and causes the electrification personnel to break away from live part, because the long duration of action of electric current brings mortal injury generally can for the electrification personnel.At present, electric power system is in order to prevent the generation of human body electrification accident, be the most important thing with this phase working line, establish and improve every rules and regulations, strengthen the standardized work of electrical production, and the insulating protection measure that strengthens electric power facility as much as possible, make high pressure electrification accident obtain effective control.But because social crowd can't be on top of to electric power knowledge, crowd's quality is widely different, add of the influence of many-sided factors such as society, life to human brain, cause the electrification accident also to happen occasionally, brought huge injury to be injured worker and people life, and brought enormous economic loss to electric power enterprise.
Summary of the invention
The objective of the invention is to solve the small current neutral grounding system human body electrification and mostly be single-phase electric shock; and it is higher behind the electrification owing to system voltage; electric arc is difficult for extinguishing; the problem that human body and electrified body can't be broken away from; provide a kind of with ground connection through the Low ESR iterative earthing; and shift the human body grounding electric current, the electrification personnel are effectively protected and effectively avoid system's overvoltage injury, the small current system human body electrification protecting method and the device that can play a protective role to system equipment and faulty equipment.
This small current system human body electrification protecting method is: adopt the microcomputer-based intelligent controller; the voltage signal input of microcomputer-based intelligent controller is connected with substation busbars; be used for gathering in real time substation busbars voltage; said microcomputer-based intelligent controller is according to system line; reach the variation of residual voltage mutually; judgement system has or not ground connection and ground connection separate; and identification ground connection send after mutually reclosing command give be connected on the microcomputer-based intelligent controller output end and with the corresponding phase-splitting circuit breaker of ground connection; this phase-splitting circuit breaker one end is connected with substation busbars by isolating switch; the other end of this phase-splitting circuit breaker is connected with earthing device; move in 0.05～0.2 second time rapidly with ground connection phase iterative earthing by this phase-splitting circuit breaker; with current transformer primary winding side joint in the control loop that constitutes by phase-splitting circuit breaker and earthing device; by current transformer acquisition controlling loop current signals; and transfer to the current signal input of microcomputer-based intelligent controller through the Current Transformer Secondary coil sides; the microcomputer-based intelligent controller carries out analysis and judgement according to the current signal that is imported into by current transformer; when in case double earthfault takes place; the action of microcomputer-based intelligent controller control phase-splitting circuit breaker makes by the microcomputer-based intelligent controller; the small current system human body electrification protective device that phase-splitting circuit breaker summation current transformer constitutes withdraws from.
A kind of small current system human body electrification protective device; its special character is: by the microcomputer-based intelligent controller; phase-splitting circuit breaker summation current transformer constitutes; the microcomputer-based intelligent controller is used for according to system line; reach the variation of residual voltage mutually; judgement system has or not ground connection and ground connection separate; and send reclosing command after mutually identification ground connection and give and the corresponding phase-splitting circuit breaker of ground connection; the control end of phase-splitting circuit breaker is connected with the output of microcomputer-based intelligent controller and controls feed motion in the back by the microcomputer-based intelligent controller mutually identification ground connection; with ground connection phase iterative earthing; said Current Transformer Secondary coil sides two ends are connected with the current signal input of microcomputer-based intelligent controller; be used for gathering the current signal in the control loop that constitutes by phase-splitting circuit breaker and earthing device and the current signal of gathering reached the current signal input of microcomputer-based intelligent controller; when system's generation double earthfault; by the action of microcomputer-based intelligent controller control phase-splitting circuit breaker, this small current system human body electrification protective device is withdrawed from rapidly.
Advantage of the present invention is:
1, because the present invention can clamp down on earth fault phase current potential rapidly and be earth potential, fault point electric arc can not be kept, the electrification personnel break away from current-carrying part, have realized the effective protection to the electrification personnel.
2, because unstable ground connection can make small current neutral grounding system overvoltage occur, the insulation of harm system equipment, system's overvoltage that this covering device also can effectively be avoided bringing therefrom injures, and can play a protective role to system equipment.
3, because the transfer of the moment of earth point; the arc light of earth fault is extinguished rapidly, reduced, improved power supply reliability because arc light causes the probability of phase fault; also alleviated the damage of ground arc in addition, faulty equipment has been played protective effect electric equipment.
4, the present invention can prevent the full cut-off accident that indoor toy causes.
5, the present invention is by analyzing system line voltage, residual voltage by the microcomputer-based intelligent controller, and it is separate accurately to differentiate ground connection, has avoided the error action of device that causes owing to factors such as voltage transformer one secondary breaks.
6, in order to prevent each alternate input simultaneously of phase-splitting circuit breaker, cause busbar fault, by the phase-splitting circuit breaker, in control loop, adopted mutual locking, and carried out phase-splitting outlet startup, guarantee phase-splitting circuit breaker realization input mutually.
7, the present invention is by current signal in the current transformer acquisition controlling loop; this small current system human body electrification protective device is withdrawed from, thereby anti-locking system when taking place, different in succession phase earth fault cause line tripping.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Embodiment 1:
As shown in Figure 1, adopt microcomputer-based intelligent controller 1, said microcomputer-based intelligent controller 1 can be single-chip microcomputer, with the voltage signal input (U of microcomputer-based intelligent controller 1
a, U
b, U
c, U
LAnd U
N) be connected with substation busbars 6; gather substation busbars 6 voltages in real time; said microcomputer-based intelligent controller 1 is according to system line; reach the variation of residual voltage mutually; judgement system has or not ground connection and ground connection separate; and identification ground connection send after mutually reclosing command give be connected on microcomputer-based intelligent controller 1 output and with the corresponding phase-splitting circuit breaker 2 of ground connection; these phase-splitting circuit breaker 2 one ends are connected with substation busbars 6 by isolating switch 5; the other end of this phase-splitting circuit breaker 2 is connected with earthing device 4; said earthing device 4 is the ground connection gauze; after microcomputer-based intelligent controller 1 sends reclosing command; make with 2 actions of the corresponding phase-splitting circuit breaker of ground connection and in 0.05～0.2 second time rapidly with ground connection iterative earthing mutually; thereby realized low resistance earthing; this phase voltage is clamped down on the current potential of the earth; the earth current that the electrification personnel are flow through is reduced to very little; the electric arc at ground connection place can not be kept, and the electrification personnel break away from live part, so the electrification personnel have been played protective effect.Current transformer 3 primary winding sides two are terminated in the control loop that is made of phase-splitting circuit breaker 2 and earthing device 4, by current transformer 3 acquisition controlling loop current signals, and transfer to the current signal input (I of microcomputer-based intelligent controller 1 through current transformer 3 secondary coil sides
a, I
b, I
c, I
n); microcomputer-based intelligent controller 1 carries out analysis and judgement according to the current signal that is imported into by current transformer 3; when in case double earthfault takes place; 2 actions of microcomputer-based intelligent controller 1 control phase-splitting circuit breaker are withdrawed from the small current system human body electrification protective device that is made of microcomputer-based intelligent controller 1, phase-splitting circuit breaker 2 summation current transformers 3.When microcomputer-based intelligent controller 1 joins fault in generation human body electrification accident and two, give warning device by central alarm signal output part 7 output alarm signals.
Embodiment 2:
As shown in the figure, this small current system human body electrification protective device is made of microcomputer-based intelligent controller 1, phase-splitting circuit breaker 2 summation current transformers 3, and said microcomputer-based intelligent controller 1 is provided with three-phase voltage input U
a, U
b, U
c, system line voltage input end U
LWith residual voltage input U
NAnd dc supply input+KM ,-KM and+XM ,-XM and central alarm signal output part 7, microcomputer-based intelligent controller 1 passes through DC power supply.Microcomputer-based intelligent controller 1 is used for when system's generation single phase ground fault, and identification ground connection phase is also sent reclosing command and given and the corresponding phase-splitting circuit breaker 2 of ground connection.The control end of phase-splitting circuit breaker 2 is connected with the output of microcomputer-based intelligent controller 1, microcomputer-based intelligent controller 1 identification ground connection mutually after, make and corresponding phase-splitting circuit breaker 2 actions of ground connection, 0.05-0.2 in time second rapidly with ground connection phase iterative earthing.Said current transformer 3 secondary coil side two ends are connected with microcomputer-based intelligent controller 1, are used for gathering by the current signal in the control loop and the current signal of gathering are reached the current signal input (I of microcomputer-based intelligent controller 1 through current transformer 3 secondary coil sides
a, I
b, I
c, I
n), when system's generation double earthfault,, this small current system human body electrification protective device is withdrawed from rapidly by 2 actions of microcomputer-based intelligent controller 1 control phase-splitting circuit breaker.
During actual the connection, microcomputer-based intelligent controller 1 is by three-phase voltage input U
a, U
b, U
c, system line voltage input end U
LWith residual voltage input U
NBe connected with substation busbars 6, phase-splitting circuit breaker 2 one ends link to each other with substation busbars by isolating switch 5, the other end of phase-splitting circuit breaker 2 is by earthing device 4 ground connection, said earthing device 4 is the ground connection gauze, and current transformer 3 primary winding sides two terminate in the control loop that is made of phase-splitting circuit breaker 2 and earthing device 4.
Claims (2)
1; a kind of small current system human body electrification protecting method; it is characterized in that: adopt microcomputer-based intelligent controller (1); the voltage signal input of microcomputer-based intelligent controller (1) is connected with substation busbars (6); be used for gathering in real time substation busbars (6) voltage; said microcomputer-based intelligent controller (1) is according to system line; reach the variation of residual voltage mutually; judgement system has or not ground connection and ground connection separate; and identification ground connection send after mutually reclosing command give be connected on microcomputer-based intelligent controller (1) output and with the corresponding phase-splitting circuit breaker of ground connection (2); these phase-splitting circuit breaker (2) one ends are connected with substation busbars (6) by isolating switch (5); the other end of this phase-splitting circuit breaker (2) is connected with earthing device (4); move in 0.05～0.2 second time rapidly with ground connection phase iterative earthing by this phase-splitting circuit breaker (2); with current transformer (3) primary winding side joint in the control loop that constitutes by phase-splitting circuit breaker (2) and earthing device (4); by current transformer (3) acquisition controlling loop current signals; and transfer to the current signal input of microcomputer-based intelligent controller (1) through current transformer (3) secondary coil side; microcomputer-based intelligent controller (1) carries out analysis and judgement according to the current signal that is imported into by current transformer (3); when in case double earthfault takes place; microcomputer-based intelligent controller (1) control phase-splitting circuit breaker (2) action makes by microcomputer-based intelligent controller (1); the small current system human body electrification protective device that phase-splitting circuit breaker (2) summation current transformer (3) constitutes withdraws from.
2; a kind of small current system human body electrification protective device; it is characterized in that: by microcomputer-based intelligent controller (1); phase-splitting circuit breaker (2) summation current transformer (3) constitutes; microcomputer-based intelligent controller (1) is used for according to system line; reach the variation of residual voltage mutually; judgement system has or not ground connection and ground connection separate; and send reclosing command after mutually identification ground connection and give and the corresponding phase-splitting circuit breaker of ground connection (2); the control end of phase-splitting circuit breaker (2) is connected with the output of microcomputer-based intelligent controller (1) and controls feed motion in the back by microcomputer-based intelligent controller (1) mutually identification ground connection; with ground connection phase iterative earthing; said current transformer (3) secondary coil side two ends are connected with the current signal input of microcomputer-based intelligent controller (1); be used for gathering the current signal in the control loop that constitutes by phase-splitting circuit breaker (2) and earthing device (4) and the current signal of gathering reached the current signal input of microcomputer-based intelligent controller (1); when system's generation double earthfault; by microcomputer-based intelligent controller (1) control phase-splitting circuit breaker (2) action, this small current system human body electrification protective device is withdrawed from rapidly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100460595A CN100442617C (en) | 2005-03-18 | 2005-03-18 | Human body electrification protecting method and apparatus for small current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100460595A CN100442617C (en) | 2005-03-18 | 2005-03-18 | Human body electrification protecting method and apparatus for small current system |
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| Publication Number | Publication Date |
|---|---|
| CN1674384A CN1674384A (en) | 2005-09-28 |
| CN100442617C true CN100442617C (en) | 2008-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100460595A Active CN100442617C (en) | 2005-03-18 | 2005-03-18 | Human body electrification protecting method and apparatus for small current system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646973A (en) * | 2012-05-15 | 2012-08-22 | 宁夏电力公司电力科学研究院 | Distribution network electric shock protection method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035926U (en) * | 1988-03-25 | 1989-04-12 | 刘佩杰 | Safety protector of shock, current leakage and overvaltage |
| CN2057786U (en) * | 1989-10-14 | 1990-05-30 | 靳文君 | Fully-automatic repeating switch type protective device for electric shock |
| CN2393240Y (en) * | 1999-09-29 | 2000-08-23 | 孙凤祥 | Electroshade protector |
| US6473281B1 (en) * | 2000-08-17 | 2002-10-29 | General Electric Company | Automatic protection device with ground fault annunciation |
-
2005
- 2005-03-18 CN CNB2005100460595A patent/CN100442617C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035926U (en) * | 1988-03-25 | 1989-04-12 | 刘佩杰 | Safety protector of shock, current leakage and overvaltage |
| CN2057786U (en) * | 1989-10-14 | 1990-05-30 | 靳文君 | Fully-automatic repeating switch type protective device for electric shock |
| CN2393240Y (en) * | 1999-09-29 | 2000-08-23 | 孙凤祥 | Electroshade protector |
| US6473281B1 (en) * | 2000-08-17 | 2002-10-29 | General Electric Company | Automatic protection device with ground fault annunciation |
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| Publication number | Publication date |
|---|---|
| CN1674384A (en) | 2005-09-28 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JINZHOU POWER SUPPLY COMPANY OF LIAONING ELECTRIC Free format text: FORMER OWNER: ZHANG WENHUI Effective date: 20120502 Free format text: FORMER OWNER: CAO FULIN Effective date: 20120502 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120502 Address after: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No. Patentee after: Jinzhou Power Supply Company of Liaoning Electric Power Co., Ltd. Address before: 121000 No. 6-38, West Lane, Guta District, Liaoning, Jinzhou Co-patentee before: Cao Fulin Patentee before: Zhang Wenhui |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20121022 |
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Effective date of registration: 20121022 Address after: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No. Patentee after: Jinzhou Power Supply Company of Liaoning Electric Power Co., Ltd. Patentee after: State Grid Corporation of China Address before: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No. Patentee before: Jinzhou Power Supply Company of Liaoning Electric Power Co., Ltd. |