Of the amount of car of new energy resources that comes as nearly two years erupt type grows, establishment of its form a complete set charges the construction dimensions of picket also expands subsequently. 2010 —2017, our country charges picket amount has reached 210 thousand from more than 1000 growth.

 

The growth of market of car of new energy resources cannot leave a foundation to charge the construction of establishment, how to assure to charge the safety using phone in the process, prevent property of life of opposite of leak electric current to cause a harm especially, it is the problem that deserves attention.

 

Electric car charges to share 4 kinds of mode, in GB/T 18487.1-2015 ” is electric car conducted charge system: of the 1st part? Does toad of  of ㄓ blown away by wind divide bandit of apricot Xin evil spirit to get a huge legendary turtle?

 

Mode is used fill cable of electrical continuity bonding to be linked together electric car and alternating current net, protection of odd electric current basically relies on the protector of odd electric current in building distribution case (RCD) , because unit of unwarrantable all and existent construction deserves to have RCD, this kind of pattern is very so dangerous, already by taboo; Mode 2 charging the supervisory and control arrangement on cable was installed on join cable (IC-CPD) , IC-CPD interior has odd electric current to detect protective function; Mode 3 use device of special power supply, will electric car and alternating current net join directly, and was installed on equipment of special power supply accuse control and guide to make device, equipment of special power supply communicates namely charge picket; Join of 4 will electric cars communicates mode when electrified wire netting or dc electrified wire netting, used take the facility of dc power supply that accuses control and guide to bring a function, flow continuously namely charge picket. Here, we basically discuss mode 3, mode 4 charge of the protector of odd electric current inside picket choose.

 

In the requirement in GB/T 18487.1-2015, appropriate uses the protector of odd electric current that communicates power supply equipment A or B, accord with GB 14084.2-2008, the relevant requirement of GB 16916.1-2014 and GB 22794-2008. If the graph is shown 1 times to charge mode 3 control guide bring circuit principle to pursue, protector of odd electric current was installed in interior of power supply equipment.

 

Graph 1 charge mode 3 control guide bring circuit principle to pursue

 

What is A model or protector of B odd electric current? The protector of odd electric current of our country (RCD) guiding standard GB/Z 6829-2008 (IEC/TR 60755:2008, MOD) ” the general requirement of protector of movement of odd electric current ” type of the basic structure from the product, odd electric current, take off buckled the respect such as means to make differentiate.

 

Can be RCD cent AC according to type of odd electric current model, A, B. Protector of AC odd electric current: Right bring to bear on suddenly or slow ascendant odd sine alternating current ensures the RCD that buckle. Protector of A odd electric current: Include AC model character is odd to pulsatile dc electric current, pulsatile 6mA of overlay of electric current of dc the rest is flowing and odd electric current ensures the RCD that buckle.

 

Protector of B odd electric current: Include A model protection is characteristic, in addition, still can reach the following sine to communicate overlay of electric current of the rest of odd electric current, communication to 1000Hz the pulsatile direct current that flowing and odd electric current, two-phase or polyphase commutate circuit generate overlay of electric current of electric current of flowing dc the rest, pulsatile dc the rest is odd electric current, flowing.

 

 

Graph 2 communication charge picket interior structure

 

Current, because B RCD price is too high, country’s major communication charges what picket interior installs is protector of A odd electric current. Place laying a plan is shown charge for communication picket interior structure pursues, used protector of A odd electric current.

 

So A is protector of odd electric current contented charge does the leakage of electricity of picket protect a requirement? We will be analysed charge the type of produces possibly odd electric current in the process.

 

Graph 3 electric cars charge establishment and electrified wire netting and sketch map of dynamoelectric workshop join

 

If the graph is shown 3 times, charge in use communication picket charges in the process, communication charges picket and car coupler and communal electrified wire netting are linked together, inside picket if be destroyed as a result of insulation, the possibility arises labour frequency to communicate leakage current.

 

In electric car share, the leakage current of generation basically comes from the likelihood to carry charger leakage of electricity at the car, charger is general develop attacks to basically be AC/DC and DC/DC two parts. Following plan institute show the main circuit picture that carries charger for a kind of common car.

 

Graph a kind of 4 car carries plan of principle of charger main circuit

 

Single-phase input alternating current passes AC/DC part above all EMI filter wave, the dc 400V voltage that falls to become the alternating current commutate of 85~265V stable output in action of Boost APFC circuit next, the class after be offers dc to input.

 

DC/DC part is used move main circuit of LLC of complete bridge changes volts d.c. 400V into the voltage with acceptability accumulator. When attaint should is isolated from between circuit board and equipment crust, in rectification part the possibility produces electricity of pulsatile dc the rest, the electricity of dc the rest with ripple very small coefficient may produce in Boost APFC circuit. The figure that Bender uses here will define the generation that sheds odd electric current continuously and harm.

 

Graph the generation of leakage of electricity of dc of charger of 5 segregation type

 

Can see, produce dc leakage of electricity possibly between transformer of complete bridge of DC/DC part push-pull, system of our country low-pressure distribution uses TN form power supply commonly, equipment metal crust and job 0 lines are conterminous, dc leakage of electricity can pass automobile body and PE line to feedback to fill electrical wiring road to go up, cause an effect to weaveform of whole system electric current. Through quits effect circuit emulate, discover the voltaic weaveform of whole system can be changed, following plan institute are shown.

 

Graph electric current of system of breakdown of 6 charger dc is undee

 

Can see after leakage of electricity of dc of back end happening, circuit of the class before also can be being affected, the pulsatile dc weaveform after rectification passes produces distortion, generation is spinal, chase class to generate interference to back end circuit, the influence arrives charge the effect, affect accumulator life even. . .