CN201054492Y - A three-polarity break current leakage protection device with ground cable current/voltage detection - Google Patents

A three-polarity break current leakage protection device with ground cable current/voltage detection Download PDF

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Publication number
CN201054492Y
CN201054492Y CNU2007200384740U CN200720038474U CN201054492Y CN 201054492 Y CN201054492 Y CN 201054492Y CN U2007200384740 U CNU2007200384740 U CN U2007200384740U CN 200720038474 U CN200720038474 U CN 200720038474U CN 201054492 Y CN201054492 Y CN 201054492Y
Authority
CN
China
Prior art keywords
current
zero
wire
voltage detecting
earth leakage
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.)
Expired - Lifetime
Application number
CNU2007200384740U
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Chinese (zh)
Inventor
邹亮平
万华新
邱步
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AO Smith China Water Heater Co Ltd
Original Assignee
AO Smith China Water Heater Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AO Smith China Water Heater Co Ltd filed Critical AO Smith China Water Heater Co Ltd
Priority to CNU2007200384740U priority Critical patent/CN201054492Y/en
Application granted granted Critical
Publication of CN201054492Y publication Critical patent/CN201054492Y/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to a triple-pole cut leakage protection device with the functions of detecting the current or voltage of the earth wire, which belongs to the technical filed of circuit safety protection. The utility model comprises a zero sequence current transformer which is sleeved on the zero wire and the fire wire, and a releasing device which is used for controlling the on and off of the power. The output of the current transformer is connected with a controlled end of the releasing device through a driving circuit. Besides, the utility model also comprises a magnetic ring which is sleeved outside the earth wire. The magnetic ring is connected with the current transformer through a short circuit current ring, thereby, the current transformer also has the function of monitoring the leaked current of the zero wire and the fire wire. When earth wire current occurs, the magnetic ring is sent back to the current transformer through the short circuit current ring, thereby ensuring that the signal can be outputted by the current transformer when occurring failures ether leaked current of the zero wire and the fire wire, or the current of the earth wire; and the driving circuit controls the releasing device to cut the power off in time, thereby ensuring the safety. The utility model has the advantages of obviously reducing the cost, and providing the leakage protection device with a power-releasing function of earth wire by adding a zero-low voltage detecting circuit.

Description

A kind of three utmost points with ground line current/voltage detecting disconnect earth leakage protective device
Technical field
The utility model relates to a kind of earth leakage protective device, and especially a kind of earth leakage protective device that is applicable to electric heater and so on household electrical appliance belongs to the protecting safety of circuit technical field.
Background technology
Earth leakage protective device is the safety guard of present electric heater and so on household electrical appliance indispensability.Its typical structure such as application number are that 02268285.6 Chinese patent application is disclosed.In order to ensure when zero live wire leakage current and ground line current occurring, all cutting off the electricity supply, guarantee safety, at present generally between zero live wire and settle zero sequence current mutual inductor on the ground wire respectively, as shown in Figure 1, the trip gear of electrical equipment and so on is succeeded in the output of two current transformers by drive circuit, thereby no matter be when the fault of zero live wire leakage current or ground line current occurring, all can in time cut off the electricity supply, guarantee safety.
Yet above-mentioned prior art is because needs adopt at least two current transformers, so cost is higher.
The utility model content
The purpose of this utility model is: at the cost problem of higher that above prior art exists, three utmost points that propose a kind of band ground line current/voltage detecting that has said function but significantly reduce cost disconnect earth leakage protective device.
In order to reach above purpose; three utmost points of band ground line current/voltage detecting of the present utility model disconnect earth leakage protective device and contain zero sequence current mutual inductor that is enclosed within on fire, the zero line and the trip gear of controlling on/off; the output of described current transformer connects the controlled end of trip gear by drive circuit; in addition; also contain the magnet ring that is enclosed within outside the ground wire, described magnet ring is by short circuit current ring and the coupling of described current transformer.
Like this, current transformer still has the function of monitoring zero live wire leakage current, and when ground line current occurring, be enclosed within the changes of magnetic field of responding on the outer magnet ring of ground wire and also electric current be coupled to this current transformer by short-circuited conducting sleeve, when thereby the fault of zero fiery leakage current or ground line current no matter occurring, all can be by the current transformer output signal, by drive circuit control trip gear, in time cut off the electricity supply, guarantee safety.And the cost of magnet ring and the short-circuited conducting sleeve of usually being made by a plain conductor is far below a current transformer.Therefore, behind employing the utility model, can under the prerequisite that does not change function, significantly reduce cost.Change the degree of coupling that magnet ring magnetic resistance or short-circuited conducting sleeve resistance adjustable ground line current are coupled to the zero sequence current mutual inductor on fire, the zero line, to regulate the ratio of ground wire drop-away current to fire, zero line zero-sequence current drop-away current.In addition, also can be connected on by current-limiting resistance between zero ground, when local tape is electric at increase by one current coil on the magnet ring that ground wire passes, electric current flows through coil, be coupled to zero sequence current mutual inductor by short-circuited conducting sleeve,, in time cut off the electricity supply by drive circuit control trip gear.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 be the utility model at the prior art circuits schematic diagram.
Fig. 2 is the circuit theory diagrams of the utility model embodiment one.
Fig. 3 is the circuit theory diagrams of the utility model embodiment two.
Embodiment
Embodiment one
Three utmost points of the band ground line current/voltage detecting of present embodiment disconnect earth leakage protective device as shown in Figure 2; zero sequence current mutual inductor T1 bridges between the zero line N and live wire L of the I of electric heater and so on electric appliances supply line; outside ground wire PE, be with magnet ring T2, short-circuited conducting sleeve Ci and current transformer T1 coupling that this magnet ring is made by copper conductor.The coil output of current transformer T1 connects the drive circuit that mainly is made of RY4145 chip for driving, controllable silicon G, rectifier bridge D, the line bag J of the output termination electromagnetic tripping apparatus of this circuit, and the actuating station of this trip gear can be controlled on/off.
After in the I of electric heater and so on electric appliances supply line, settling the earth leakage protective device of present embodiment; because when ground line current occurring; the changes of magnetic field of responding on the magnet ring is coupled to current transformer by short-circuited conducting sleeve; when the fault of zero fiery leakage current or ground line current therefore no matter occurring; all can be by the current transformer output signal; by chip for driving conducting controllable silicon; and make electromagnetic tripping apparatus line Bao Dedian through rectifier bridge; its actuating station of adhesive; in time cut off the electricity supply; avoid unexpected and take place, guarantee safety.Because saved current transformer, and simplified drive circuit, so its cost is very economical.
Embodiment two
The basic comprising of three utmost points disconnection earth leakage protective device of present embodiment band ground line current/voltage detecting as shown in Figure 3, and is identical with embodiment one.Difference is that increase is connected between zero line N and the ground wire by current-limiting resistance R (or Resistor-Capacitor Unit) around the coil on the magnet ring T2.Like this, can monitor voltage between zero line and the ground wire simultaneously.When electric wire voltage surpasses limit value, current transformer also will be exported control signal, cut off the electricity supply, thereby further guarantee the safe handling of electric equipment.Certainly, this coil also can be used as additional coils on zero sequence current mutual inductor T1.
In addition to the implementation, the utility model can also have other execution modes.For example, no matter be that drive circuit or trip gear can have various variations.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.

Claims (6)

1. three utmost points with ground line current/voltage detecting disconnect earth leakage protective device; contain zero sequence current mutual inductor that is enclosed within on fire, the zero line and the trip gear of controlling on/off; the output of described current transformer connects the controlled end of trip gear by drive circuit; it is characterized in that: also contain the magnet ring that is enclosed within outside the ground wire, described magnet ring is by short-circuited conducting sleeve and the coupling of described zero sequence current mutual inductor.
2. three utmost points according to the described band ground line current/voltage detecting of claim 1 disconnect earth leakage protective device, it is characterized in that: be wound with coil on the described magnet ring, described coil is connected between zero line and the ground wire by polyphone current-limiting resistance or Resistor-Capacitor Unit.
3. three utmost points according to the described band ground line current/voltage detecting of claim 1 disconnect earth leakage protective device; it is characterized in that: be wound with additional coils on the described zero sequence current mutual inductor, described additional coils is connected between zero line and the ground wire by polyphone current-limiting resistance or Resistor-Capacitor Unit.
4. three utmost points according to claim 2 or 3 described band ground line current/voltage detecting disconnect earth leakage protective device, and it is characterized in that: described short-circuited conducting sleeve is made by becket or lead.
5. three utmost points according to the described band ground line current/voltage detecting of claim 4 disconnect earth leakage protective device, and it is characterized in that: described drive circuit mainly is made of chip for driving, controllable silicon, rectifier bridge.
6. three utmost points according to the described band ground line current/voltage detecting of claim 5 disconnect earth leakage protective device, and it is characterized in that: described trip gear is made of electromagnetic tripping apparatus.
CNU2007200384740U 2007-07-10 2007-07-10 A three-polarity break current leakage protection device with ground cable current/voltage detection Expired - Lifetime CN201054492Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2007200384740U CN201054492Y (en) 2007-07-10 2007-07-10 A three-polarity break current leakage protection device with ground cable current/voltage detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2007200384740U CN201054492Y (en) 2007-07-10 2007-07-10 A three-polarity break current leakage protection device with ground cable current/voltage detection

Publications (1)

Publication Number Publication Date
CN201054492Y true CN201054492Y (en) 2008-04-30

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CNU2007200384740U Expired - Lifetime CN201054492Y (en) 2007-07-10 2007-07-10 A three-polarity break current leakage protection device with ground cable current/voltage detection

Country Status (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101826715A (en) * 2009-03-06 2010-09-08 上海益而益电器制造有限公司 Wiring protection device
CN102646956A (en) * 2012-04-18 2012-08-22 刘睿刚 Electric leakage protection device
CN103151758A (en) * 2013-03-15 2013-06-12 王继杰 Voltage and current type electric leakage plug
CN105158625A (en) * 2015-07-30 2015-12-16 青岛海尔科技有限公司 Grounding detection device for household electrical appliance ground wire
CN105783273A (en) * 2016-04-29 2016-07-20 芜湖美的厨卫电器制造有限公司 Water heater

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101826715A (en) * 2009-03-06 2010-09-08 上海益而益电器制造有限公司 Wiring protection device
CN101826715B (en) * 2009-03-06 2015-09-09 益而益(集团)有限公司 A kind of Wiring protection device
CN102646956A (en) * 2012-04-18 2012-08-22 刘睿刚 Electric leakage protection device
CN103151758A (en) * 2013-03-15 2013-06-12 王继杰 Voltage and current type electric leakage plug
CN105158625A (en) * 2015-07-30 2015-12-16 青岛海尔科技有限公司 Grounding detection device for household electrical appliance ground wire
CN105158625B (en) * 2015-07-30 2019-03-22 青岛海尔科技有限公司 A kind of ground detection device of household electrical appliance ground wire
CN105783273A (en) * 2016-04-29 2016-07-20 芜湖美的厨卫电器制造有限公司 Water heater

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Granted publication date: 20080430