[introduction]Electric breakdown protects the big trend that is globalization, breaker of ground connection breakdown and odd electric current flow detect sensor can avoid electrical shock incident effectively to happen, the voltaic sensor that designs technically can detect the communication of milliampere level and electric current of dc ground connection, use judgement to whether can produce a harm to human body thereby. The meeting when following sketch map described human body simply to get an electric shock has electric current to pass the earth, this disequilibrium electric current namely leakage current, through detecting this leakage current can be judged get an electric shock or the incident of insulation puncture.

This chapter passes the harm that summarizes leakage current, 4 kinds of different electric cars charge mode, thereby derivative the sensor of odd electric current that applies to different pattern, and the range of products that shared Western Automation detects as electric current plan is referenced.

Electric breakdown protects the big trend that is globalization, breaker of ground connection breakdown and odd electric current flow detect sensor can avoid electrical shock incident effectively to happen, the voltaic sensor that designs technically can detect the communication of milliampere level and electric current of dc ground connection, use judgement to whether can produce a harm to human body thereby. The meeting when following sketch map described human body simply to get an electric shock has electric current to pass the earth, this disequilibrium electric current namely leakage current, through detecting this leakage current can be judged get an electric shock or the incident of insulation puncture.

The introduction at endangering electric current is concerned inside electrical engineering ABC

Interior of our human body has biology report, we are active, can think, can breathe, it is rely on biology report deliver, if exterior big electric current sheds classics human body, can disturb the nerve inside our body is delivered, of big electric current calorific return organization of meeting attaint human body to wait, create life risk.

Report can endanger our person security, basically be to depend on electric current, is not voltage, if voltage is very tall, but its energy is very small, electric current is very small, won’t have risk to the person, for example the electronic igniter of lighter, (small-power) the high-pressured electric arc of tesla coil.

Human body is electric good conductor, human body gets after electrical shock, can electric current passes human body. Shock current is the main reason that causes human body harm. The measurement of shock current is different, get an electric shock the harm that cause also can differ. Think commonly, shock current from arrive greatly small, according to cause harm size to be able to be divided to feel electric current, cast off electric current, harm electric current and deadly electric current.

Sensory current: It is to point to fall in certain probability, the smallest electric current of any feelings can be caused when electric current passes human body. When electric current achieves communication 1mA to perhaps shed 5mA continuously, human body can have a feeling, osculatory place can have keenly feel of slight paralytic, thorn, may cause Gao Zhui to wait for harm 2 times. Probability is 50% when average sensory current is 11mA about, the smallest for 0.5mA, the woman is 0.7mA about;

Cast off electric current: The person that shows the hand grasps electrical body can cast off the biggest electric current of electrical body by oneself. Although human body can cast off electrical body but get the account such as constitution of length of time of osculatory electrical body, age also but insensible, death. Normally cast off electric current to regard danger as critical electric current, of grown man cast off electric current on average to be 16mA about, of grown woman cast off electric current on average to be 10.5mA about; Cast off probability to be 99.5% when, of grown man and grown woman cast off electric current on average to be 9A and 6mA about.

Room quiver electric current: Point to inside short time, can cause ventricular and vibratile the smallest electric current. Electric current makes each part incongruous shakes ventricular flesh, cause mortality rhythm of the heart wrong cause ventricle to vibrate cause blood to stop the death that send a person circularly. Regard bounds of deadly electric current as the smallest electric current that causes ventricle to vibrate normally, when voltaic duration exceeds heart throb cycle, the person’s room quivers electric current is 50mA about, when voltaic duration short at beating is periodic, the person’s room quivers electric current is hundreds milliampere about. The volume that carries human body electricity depends on extra voltage and human body resistor.

Deadly electric current: When the alternating current that carries human body achieves 100mA, if pass time to achieve 1s, make a person deadly with respect to enough.

GB18478.1 electric car is conducted charge the first part has the system inside current requirement 4 kinds when introduce electric car charge mode

Mode 1:

Charge outlet of systematic use level and electrical outlet, single-phase communication power supply should be used in energy transmission process, and do not allow to exceed 8A/250Vac, this mode has wire cable and contact only, do not have among any protection and control box, this mode should not use pair of electric cars to charge.

Mode 2:

Charge outlet of systematic use level and electrical outlet, single-phase communication power supply should be used in energy transmission process, from the standard socket should offer conductor of protective ground connection to electric car, and should have odd electricity protection and shed protective function too, namely common portable charge box, domestic general 220Vac, 10/16A.

Mode 3:

The power supply device that uses at receiving alternating current net repeatedly will be electric car and the circumstance that communicate join of electrified wire netting to rise, and be on equipment of electric car power supply install special protector, should have odd electric current to protect a function, the distinction of 2 depends on this mode and mode charge equipment connective is equipment of special communication power supply, family expenses of and rather than communicates electrified wire netting. Single-phase power supply is not more than 32A commonly, three-phase power supply is not more than 63A.

Mode 4:

Application receives the situation of equipment of dc power supply repeatedly at electric car, this mode namely appropriative dc fills picket quickly, charging current has greatly achieve 350A taller even, volts d.c. also arrives from 200V 800V, just go ahead toward 1000V even, the electric car great majority that current market volume produces or 500V are the following, charge under voltaic 250A give priority to, mode 4 already charge time shortens inside the hour.

IEC61851-1 electric car is conducted charge the first part also has the system inside current requirement 4 kinds when introduce electric car charge mode

The introduction of mode is same, here does not repeat more, among them distinction basically depends on mode 1 with mode 2 allow the biggest electric current to want a few bigger, among them mode 16A of electric current of 250Vac/ of 1 single-phase voltage is the biggest, 16A of electric current of three-phase report 480Vac/ is the biggest, mode 32A of electric current of 250Vac/ of 2 single-phase voltage is the biggest, 32A of electric current of three-phase report 480Vac/ is the biggest.

Type of sensor of odd electric current

Sensor of AC odd electric current: Touch hair condition to fall for electric current of sine the rest, frequency is 50/60Hz normally.

Sensor of A odd electric current: With AC model, the flowing dc of 6mA of overlay of electric current of additional pulsatile dc flows.

Sensor of F odd electric current: With A model, the flowing dc of 10mA of overlay of electric current of additional pulsatile dc flows; Look line and neuter line or look line and generation of ground wire midpoint are electric current of sine the rest, 50Hz< frequency <1000Hz.

Sensor of B odd electric current: With F model, touch hair condition additionally to achieve 1000Hz, communication for electric current of sine the rest flowing dc sheds overlay of odd electric current, 0.4 times rated and odd electric current or 10mA, both take big cost; Flowing dc sheds overlay of pulsatile and odd electric current, 0.4 times rated and odd electric current or 10mA, both take big cost; Dc electric current comes from the rest to shed circuit at rectifying, for example ambipolar, triode, 4 extremely the connector of bridge-type of double pulse of photograph of get along with of device, triode, 4 extremely the 3 pulsar of device or connector of 6 pulse bridge-type; Flowing dc flows.

To mode 2 with mode 3 metropolises involve sine communication, pulsatile dc and electric current of flowing dc the rest, the leakage current that often also alludes namely, because this weight is very little, need appropriative sensor will regard as detect, through collecting the tiny magnetic field signal that delivers dc heft generation, change the voltage that takes to can be read or voltaic signal, offer thereby advocate chip will regard an insulation as puncture and function of protection getting an electric shock. And mode the dc picket of 4, normally bridge-type resistance standard or harmonic infuse law detect insulation and circumstance of leakage of electricity, of course also electric current of use the rest detects of device, depend on design of research and development.

Range of products of sensor of odd electric current

Littelfuse bought Western Automation, thereby augment leakage of electricity detects product line, material information is as follows, additionally communication charges still need to add pressurization quick to regard surge of be struck by lightning as protection normally inside the box, charge micro-gap switch of the need on the gun serves as insert unplug gun position detects, and the switch that solid state relay regards handclasp as the agreement, littelfuse has complete solution, be interested, those who think more thorough knowledge is OK seek local technology support.

 

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