CN2034745U - Current-limiting leakage protector - Google Patents
Current-limiting leakage protector Download PDFInfo
- Publication number
- CN2034745U CN2034745U CN 87209890 CN87209890U CN2034745U CN 2034745 U CN2034745 U CN 2034745U CN 87209890 CN87209890 CN 87209890 CN 87209890 U CN87209890 U CN 87209890U CN 2034745 U CN2034745 U CN 2034745U
- Authority
- CN
- China
- Prior art keywords
- power supply
- current
- leakage protector
- comparator
- rationing
- Prior art date
- 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.)
- Withdrawn
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Abstract
The utility model relates to a current-limiting leakage protector which is a device in a power supply system and is arranged on the line-in position of a planned area to be supplied with power. The current-limiting leakage protector utilizes the method of comparing a sampling voltage and a reference voltage and depends on a relay and the thyristor which drives the relay to push a knife switch. Thus, the effects of the limiting power supply and the electrical leakage protection can be realized simultaneously. The function of limiting electricity can be preset and be given by steps.
Description
The electric leakage protector of rationing the power supply is a kind of dedicated devices in the power supply-distribution system, is contained in the regional subscriber's drop of plan power supply place.
It is 600 watts by norm a kind of electricity-limiter of some area uses of rural area at present, and is unadjustable.It makes moving plate with bimetal leaf, and string has heating wire on the still, and user's electric current makes the electrothermal wire heating, the crooked outage of bimetal leaf; After treating that the heating wire temperature leaves, bimetal leaf restores to the original state, and connects circuit.The shortcoming of this electricity-limiter is that heating is big, and the contact often is in the current switching transfer process, and the life-span is short.
A kind of leakage switch that has overload protection concurrently is arranged, and it adopts the bimetal leaf string in supply line.When overload took place circuit, the bimetal leaf bending made the release action, and the switch separating brake is cut off the electricity supply.The given performance of this machine specification is: during cold start-up, overload current is 2.55 times of rated current, and release moved between 1 second to 60 seconds.Its shortcoming is that the release operating current is unadjustable.
The purpose of this utility model provides the ration the power supply electric leakage protector of function of a kind of band, and its value of rationing the power supply is that stepping is set, and the electrician can be user's gear shift easily, and its current limit has higher precision.
This utility model is achieved in that the sampling resistor that increases a current transformer or the milliohm level of connecting on the basis of present existing electric leakage protector, under the prerequisite that does not influence former electric leakage protector performance, two kinds of functions promote a relay by a thyristor and realize.Its function of rationing the power supply can be regulated by stepping.For example same product is worked as K
2When 1 position, the flow valuve of rationing the power supply is 1A; Work as K
2When 2 positions, the flow valuve of rationing the power supply is 2A; Work as K
2When 3 positions, the flow valuve of rationing the power supply is 3A.Its precision of rationing the power supply is 10% of a set point.
Though fusible link has good short-circuit protection effect, because of general blowout current is 5～6 times of load running current, the precision of restriction electric current is relatively poor, and influenced by ambient temperature.
Show gauge table though kilowatt-hour meter is a kind of numeral, it can only measure and can not prevent the electricity consumption that exceeds the quata, the usefulness of should not rationing the power supply.
In the area that acts out one's plan power supply, enforcement of the present utility model can prevent the user to use electric furnace effectively to each threshold volume power supply.The volume electricity consumption if the user is transfinited, then the utility model just cut off this power supply within several seconds, thereby had ensured the normal power supply of industrial and agricultural production and resident living.During electric shock, this utility model is cut off the electricity supply rapidly, the protection person poultry safety.
The embodiment and the accompanying drawing thereof of the former reason the following stated of electricity of the present utility model provide.
Power supply from A ' C ' through knife switch K
1Inlet wire, subscriber equipment meets AC.Put the sampling resistor R of a current transformer or the milliohm level of connecting on the C ' C line
SIf the sampled voltage peak value is greater than K
2The reference voltage of setting, comparator A
2The output high level is through D
3R
2To the integration capacitor C
2Charging.Through the several seconds, C
2On voltage be higher than voltage stabilizing didoe D
4Burning voltage, D
4Puncture comparator A
1The output high level triggers thyristor SCR, relay J adhesive, releasing of brake knife switch K
1, stop to power to AC.
The earth leakage protective part of this utility model is identical with existing electric leakage protector.Subscribers feeder A ' A and C ' C pass balancing current transformer B.During normal electricity consumption, A ' A equates that with the last current instantaneous value of C ' C direction is opposite, the magnetic flux among the magnetic core B and be zero, the secondary non-inductive voltage of B.When equipment electric leakage or ground people touched live wire, one electric current was gone into ground from live wire one end through equipment or human body, and refluxes without center line.Produce uneven magnetic flux among the B, induce a voltage on the secondary coil of B, this voltage is compared with reference voltage.When the induced voltage peak value surpasses reference voltage, comparator A
1The output high level, thyristor SCR is triggered, relay J adhesive, releasing of brake knife switch K
1, stop power supply to AC, reach the purpose of protection people and animals' life and property safety.
Comparator A
1And A
2Power supply be direct current, it is to be introduced from A by alternating current, through resistance R
1Current limliting, D
1Make halfwave rectifier, C
1Filtering is through D
2Provide after the voltage stabilizing.
Claims (2)
1, the utility model is a kind of electric leakage protector of rationing the power supply in the power supply-distribution system, it is characterized in that sealing in supply line the resistance R of a milliohm level
sOr put a current transformer on the line to obtain and the proportional sampled voltage of user's electric current; Sampled voltage and K
2The reference voltage of setting is at comparator A
2In compare, when sampled voltage peak value during greater than reference voltage, A
2The output high level is through R
2C
2The time-delay several seconds, promote comparator A
1The output high level, thyristor SCR conducting, relay J adhesive, knife switch K
1Disconnect, cut off user's power supply.
2, the electric leakage protector of rationing the power supply according to claim 1 is characterized in that passing through K
2Make different reference voltages insert comparator A
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87209890 CN2034745U (en) | 1987-07-10 | 1987-07-10 | Current-limiting leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87209890 CN2034745U (en) | 1987-07-10 | 1987-07-10 | Current-limiting leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2034745U true CN2034745U (en) | 1989-03-22 |
Family
ID=4824905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87209890 Withdrawn CN2034745U (en) | 1987-07-10 | 1987-07-10 | Current-limiting leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2034745U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354943A (en) * | 2011-09-20 | 2012-02-15 | 广东天富电气集团有限公司 | Work method of electronic release |
| CN101639818B (en) * | 2008-07-28 | 2012-07-11 | 联咏科技股份有限公司 | Interface circuit of serial bus |
-
1987
- 1987-07-10 CN CN 87209890 patent/CN2034745U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639818B (en) * | 2008-07-28 | 2012-07-11 | 联咏科技股份有限公司 | Interface circuit of serial bus |
| CN102354943A (en) * | 2011-09-20 | 2012-02-15 | 广东天富电气集团有限公司 | Work method of electronic release |
| CN102354943B (en) * | 2011-09-20 | 2016-12-28 | 广东天富电气股份有限公司 | A kind of method of work of electronic trip unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |