CN204089151U - A kind of family with leakage current protection device table case - Google Patents
A kind of family with leakage current protection device table case Download PDFInfo
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- CN204089151U CN204089151U CN201420574192.2U CN201420574192U CN204089151U CN 204089151 U CN204089151 U CN 204089151U CN 201420574192 U CN201420574192 U CN 201420574192U CN 204089151 U CN204089151 U CN 204089151U
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- leakage current
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- control unit
- mutual inductor
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Abstract
A kind of family with leakage current protection device table case; leakage current protection device comprises one group of zero sequence current mutual inductor (6), B casing (7), control unit and A.C. contactor (8); B casing (7) is arranged on A casing (1); control unit is arranged in B casing (7); one group of zero sequence current mutual inductor (6) responds to the current enter leakage current signal of one group of ammeter (2) respectively; one group of zero sequence current mutual inductor (6) transfers signals to control unit respectively, and control unit controls the break-make of electricity supply cable electric current by A.C. contactor (8).The utility model has the backup protection effect accurately of family expenses leakage current protection device; in guarantee rural area Reliability of Power Supplying Net Work, leakage events investigation etc.; also beneficial, be highly significant for improving existing low-voltage distribution network leakage current protection three-level protective general layout, improving rural area low-voltage distribution network safety operation level.
Description
Technical field
The utility model relates to leakage current protection field, is specifically related to a kind of family with leakage current protection device table case.
Background technology
At present, rural area low-voltage distribution network leakage current protection is generally three-level protective, namely always protects, branch protects and family expenses are protected.Wherein, family expenses protection is installed on user indoor, and getting an electric shock to the person provides direct protection; Total protection and branch's protection are installed on power distribution station, provide indirect protection to person electric shock and equipment leakage.The setting principle protected due to always protection and branch is identical with protective nature, and therefore, total protection can be considered a kind of backup protection that branch protects.From three-level protective collocation form, total protection and branch's protection also can be considered the backup protection that family expenses are protected, but due to distinct on setting principle and protective nature, total protection and branch's protection can not provide comprehensive backup protection for family expenses protection.Family expenses leakage current protection device plays an important role to preventing personal electric shock injures and deaths event; but its management difficulty is large; spoilage is high; cause its dependability general lower; the protective effect once can not bring into normal play; when total protection and branch's protection can not provide backup protection accurately and reliably, its consequence is hardly imaginable.In fact, the loss of life or personal injury event occurred due to the tripping of family expenses earth leakage protective device is of common occurrence.Existing total protection and branch's protection generally use more advanced intelligence or comprehensive leakage current protective device; such device usually leakage current is divided into gradual leakage current and sudden change leakage current is protected respectively; gradual leakage current protection setting value is generally large than sudden change leakage current protection setting value; sudden change leakage current protection wherein provides protection to get an electric shock to the person and designs; certainly also comprise for family expenses leakage current protection device provides backup protection; but practical effect shows that its effect is very limited, and can produce some adverse consequencess:
If 1 always protection and branch's protection act are caused by sudden change leakage current; but cause the reason of protective device action still to exist after total protection or branch's protection act; as the person gets an electric shock the sudden change leakage current that causes and electric shock person does not depart from power supply; total protection or branch's protection are when overlapping; this sudden change leakage current can be considered as gradual leakage current, thus lose the protection to electric shock person.After now personal shock current occurs in family expenses protective device, total protection and branch's protection just do not play family expenses protective device backup protection effect.
2, rural area distribution because of insulation level low; very easily produce sudden change leakage current; as branch touches primary cable in short-term, the low wire of insulation level private temporary electricity being disorderly connected to open air that draws after family expenses protective device is used also easily to cause producing sudden change leakage current.After the tripping of family expenses protective device, total protection and branch's protection also possibility action, thus play family expenses protective device backup protection effect, but whole power distribution station or whole piece branched line now can be caused to have a power failure, affect power distribution station power supply reliability.
Utility model content
Total be exactly the purpose of this utility model protects the backup protection scarce capacity to family expenses protective device for existing protection and branch, and provide a kind of family with leakage current protection device to show case.
The utility model comprises family table case body, family table case body is by A casing, one group of ammeter, electricity supply cable, one group goes out electrical cables and one group of switch, one group of ammeter and one group of switch are arranged in A casing respectively, electricity supply cable is electrically connected with the current enter of one group of ammeter respectively, one group goes out electrical cables and is electrically connected with the current output terminal of one group of ammeter respectively, one group of switch controls one group respectively and goes out electrical cables break-make, it is characterized in that it also has leakage current protection device, leakage current protection device comprises one group of zero sequence current mutual inductor, B casing, control unit and A.C. contactor, B casing is arranged on A casing, control unit is arranged in B casing, the current enter leakage current signal of one group of ammeter responded to respectively by one group of zero sequence current mutual inductor, one group of zero sequence current mutual inductor transfers signals to control unit respectively, control unit controls the break-make of electricity supply cable electric current by A.C. contactor.Control unit comprises one group of comparator, one group of diode, one group of resistance, capacitor, triode and relay, one group of zero sequence current mutual inductor is respectively by Signal transmissions to group comparator, signal is sent to one group of diode and judges by one group of comparator, signal after judgement is transferred to triode by one group of resistance and capacitor by one group of diode, triode again by Signal transmissions to relay, relay controls the break-make of electricity supply cable electric current by A.C. contactor.Control unit comprises Analog input mModule, PLC, output module, the current signal sensed is transferred to PLC by Analog input mModule by group of zero sequence current mutual inductor respectively, signal is sent to output module by PLC, and output module controls the break-make of electricity supply cable electric current by A.C. contactor.
The utility model advantage is: 1, protect the setting principle of widely used intelligence or comprehensive leakage current protective device different with protective nature from existing total protection and branch; this device, by direct protection seting operating value, can provide leakage current directly to protect to multiple user simultaneously.2, this device and family expenses protective device are protected for same leakage events, have backup protection effect accurately to family expenses protective device.3, be conducive to the management of family expenses protective device, if the action of this device, illustrate that the family expenses protective device of rear stage damages, be convenient to timely reparation and the management of family expenses protective device.4, this device is by stopping power transmission successively to the subscriber switch installed in the table case of family thus conveniently investigate leakage events.5, after this device action, power failure range only has limited user, decreases total protection and branch's protection act probability, can effectively improve rural power service reliability.The utility model have to the direct defencive function of the standby of family expenses protective device; rural area low-voltage distribution network being prevented to accident of human electric shock and improves power supply reliability have important function, is highly significant for improving the configuration of existing low-voltage distribution network leakage current three-level protective, improving rural area distribution safety operation level.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is utility model works theory structure schematic diagram.
Fig. 3 is the utility model PLC operation principle structural representation.
Embodiment
As Fig. 1, 2, shown in 3, the utility model comprises family table case body, family table case body is by A casing 1, one group of ammeter 2, electricity supply cable 3, one group goes out electrical cables 4 and one group of switch 5, one group of ammeter 2 and one group of switch 3 are arranged in A casing 1 respectively, electricity supply cable 3 is electrically connected with the current enter of one group of ammeter 2 respectively, one group goes out electrical cables 4 and is electrically connected with the current output terminal of one group of ammeter 2 respectively, one group of switch 5 controls one group respectively and goes out electrical cables 4 break-make, it is characterized in that it also has leakage current protection device, leakage current protection device comprises one group of zero sequence current mutual inductor 6, B casing 7, control unit and A.C. contactor 8, B casing 7 is arranged on A casing 1, control unit is arranged in B casing 7, the current enter leakage current signal of one group of ammeter 2 responded to respectively by one group of zero sequence current mutual inductor 6, one group of zero sequence current mutual inductor 6 transfers signals to control unit respectively, control unit controls the break-make of electricity supply cable electric current by A.C. contactor 8.Control unit comprises one group of comparator, 9, one group of diode 17, one group of resistance 10, capacitor 11, triode 12 and relay 13, one group of zero sequence current mutual inductor 6 is respectively by Signal transmissions to group comparator 9, signal is sent to one group of diode 17 and judges by one group of comparator 9, signal after judgement is transferred to triode 12 by one group of resistance 10 and capacitor 11 by one group of diode 17, triode 12 again by Signal transmissions to relay 13, relay 13 controls the break-make of electricity supply cable electric current by A.C. contactor 8.Control unit comprises Analog input mModule 14, PLC 15, output module 16, the current signal sensed is transferred to PLC 15 by Analog input mModule 14 by group of zero sequence current mutual inductor 6 respectively, signal is sent to output module 16 by PLC 15, and output module 16 controls the break-make of electricity supply cable electric current by A.C. contactor 8.
Embodiment one:
As shown in the figure; when generation electric leakage accident; the leakage current passed through in family expenses leakage current protection device is identical with by certain zero sequence current mutual inductor in one group of zero sequence current mutual inductor 6; design by family expenses protective device; family expenses protective device should action in 0.1 second; cut off power supply, thus the leakage current of this user should be zero.When family's earth leakage protective device is damaged and is failure to actuate, the leakage current passed through in the zero sequence current mutual inductor that this user in one group of zero sequence current mutual inductor 6 is corresponding is not change in 0.1 second, current signal transfer processes to one group of comparator 9 by secondary side output by one group of zero sequence current mutual inductor 6, one group of comparator 9 again by Signal transmissions to group diode 17, the one group of resistance 10 after relatively and capacitor 11, (effect of one group of diode 17 be equivalent to one or; The effect of one group of resistance 10 and capacitor 11 is composition delay circuits; delay time is adjusted by driving triode action when being greater than slightly 0.1 second) capacitor 11 again by Signal transmissions to triode 12; triode 12 again by Signal transmissions to relay 13; relay 13 controls A.C. contactor 8 and disconnects; thus electricity supply cable 3 is disconnected; because this unit protection is adjusted by being greater than 0.1 second operate time, thus the object of family expenses earth leakage protective device backup protection can be reached.
Embodiment two:
As shown in the figure; when generation electric leakage accident; the leakage current passed through in family expenses leakage current protection device is identical with by certain zero sequence current mutual inductor in one group of zero sequence current mutual inductor 6; design by family expenses protective device; family expenses protective device should action in 0.1 second; cut off power supply, thus the leakage current of this user should be zero.When family's earth leakage protective device is damaged and is failure to actuate, one group of zero sequence current mutual inductor 6 senses that leakage current does not change within the 0.1 second time that action answered by family expenses protective device, current changing signal is transferred to Analog input mModule 14 by secondary side output by one group of zero sequence current mutual inductor 6, Analog input mModule 14 by transform Signal transmissions to PLC 15, control signal is transferred to output module 16 by PLC 15, output module 16 controls A.C. contactor 8 and disconnects, thus electricity supply cable 3 is disconnected, thus the object of family expenses earth leakage protective device backup protection can be reached.
Claims (3)
1. the table case of the family with leakage current protection device, it comprises family table case body, family table case body is by A casing (1), one group of ammeter (2), electricity supply cable (3), one group goes out electrical cables (4) and one group of switch (5), one group of ammeter (2) and one group of switch (3) are arranged in A casing (1) respectively, electricity supply cable (3) is electrically connected with the current enter of one group of ammeter (2) respectively, one group goes out electrical cables (4) and is electrically connected with the current output terminal of one group of ammeter (2) respectively, one group of switch (5) controls one group respectively and goes out electrical cables (4) break-make, it is characterized in that it also has leakage current protection device, leakage current protection device comprises one group of zero sequence current mutual inductor (6), B casing (7), control unit and A.C. contactor (8), B casing (7) is arranged on A casing (1), control unit is arranged in B casing (7), one group of zero sequence current mutual inductor (6) responds to the current enter leakage current signal of one group of ammeter (2) respectively, one group of zero sequence current mutual inductor (6) transfers signals to control unit respectively, control unit controls the break-make of electricity supply cable electric current by A.C. contactor (8).
2. a kind of family with leakage current protection device according to claim 1 table case, it is characterized in that control unit comprises one group of comparator (9), one group of diode (17), one group of resistance (10), capacitor (11), triode (12) and relay (13), one group of zero sequence current mutual inductor (6) is respectively by Signal transmissions to group comparator (9), signal is sent to one group of diode (17) and judges by one group of comparator (9), signal after judgement is transferred to triode (12) by one group of resistance (10) and capacitor (11) by one group of diode (17), triode (12) again by Signal transmissions to relay (13), relay (13) controls the break-make of electricity supply cable electric current by A.C. contactor (8).
3. a kind of family with leakage current protection device according to claim 1 table case; it is characterized in that control unit comprises Analog input mModule (14); PLC (15); output module (16); the current signal sensed is transferred to PLC (15) by Analog input mModule (14) by group of zero sequence current mutual inductor (6) respectively; signal is sent to output module (16) by PLC (15), and output module (16) controls the break-make of electricity supply cable electric current by A.C. contactor (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420574192.2U CN204089151U (en) | 2014-10-08 | 2014-10-08 | A kind of family with leakage current protection device table case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420574192.2U CN204089151U (en) | 2014-10-08 | 2014-10-08 | A kind of family with leakage current protection device table case |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204089151U true CN204089151U (en) | 2015-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420574192.2U Expired - Fee Related CN204089151U (en) | 2014-10-08 | 2014-10-08 | A kind of family with leakage current protection device table case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204089151U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114465195A (en) * | 2022-01-07 | 2022-05-10 | 国网河北省电力有限公司磁县供电分公司 | Leakage protection method, ammeter box and power grid system |
-
2014
- 2014-10-08 CN CN201420574192.2U patent/CN204089151U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114465195A (en) * | 2022-01-07 | 2022-05-10 | 国网河北省电力有限公司磁县供电分公司 | Leakage protection method, ammeter box and power grid system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Jiang Cen Inventor after: Li Chaohui Inventor after: Liu Hui Inventor after: Li Kaicheng Inventor after: Jiang Shujin Inventor after: Li Zhilin Inventor before: Jiang Cen Inventor before: Li Chaohui Inventor before: Liu Hui |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: JIANG CEN LI ZHAOHUI LIU HUI TO: JIANG CEN LI ZHAOHUI LIU HUI LI KAICHENG JIANG SHUJIN LI ZHILIN |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20161008 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |