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優(yōu)勢(shì)品牌：Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各種進(jìn)口工業(yè)零部件
YASKAWA JRMSI-B1027伺服驅(qū)動(dòng)電機(jī)現(xiàn)貨 YASKAWA JRMSI-B1027伺服驅(qū)動(dòng)電機(jī)現(xiàn)貨 YASKAWA JRMSI-B1027伺服驅(qū)動(dòng)電機(jī)現(xiàn)貨 YASKAWA JRMSI-B1027伺服驅(qū)動(dòng)電機(jī)現(xiàn)貨
轉(zhuǎn)換器在其交流輸入端造成短時(shí)短路，因此
-稱為換向凹口。這種凹口低至0 V（100%）深度）可在變流器的次級(jí)繞組處接受
（專用）變壓器（無(wú)線路扼流圈運(yùn)行）。然而
如果使用相同的變壓器供電，則必須減少其深度兩個(gè)以上功率相當(dāng)?shù)霓D(zhuǎn)換器。在這種情況下，行扼流圈是必要的。它們必須引起大約1%的相對(duì)電壓
在額定電流下下降。如果出現(xiàn)以下情況，也需要使用所謂的1%扼流圈：與可用的相比，轉(zhuǎn)換器的功率非常低
變壓器或電源線的功率。ABB提供合適的1%窒息。
根據(jù)歐洲產(chǎn)品標(biāo)準(zhǔn)EN 61800-3
換向槽口必須保持低于線路電壓的20%
在一種環(huán)境中，規(guī)定了40%的上限
對(duì)于第二環(huán)境。這個(gè)目標(biāo)可以通過(guò)線路阻塞的輔助。應(yīng)用于這些扼流圈的電感
一個(gè)環(huán)境的值必須是網(wǎng)絡(luò)的4倍
轉(zhuǎn)換器連接點(diǎn)（公共點(diǎn)）處的電感耦合，PCC），如圖5.2-3所示。因此，在許多情況下
所謂的4%扼流圈是必要的，因此ABB也提供除了1%的扼流圈外，還需要合適的4%線路扼流器。通常，大電流不受變壓器限制，而是受連接工業(yè)區(qū)的電力電纜。因此，有必要詢問(wèn)
關(guān)于線路阻抗和電流的能源供應(yīng)公司
其在期望的公共耦合點(diǎn)（PCC）處可用。分離變壓器不需要線路扼流圈，因?yàn)椋浩渎└泻徒拥仄林g
繞組節(jié)省了EMC濾波器，參見(jiàn)1和4。屏幕和熨斗鐵芯必須與變流器的安裝板連接良好。如果變壓器位于變流器柜外屏蔽三相電纜的屏幕（環(huán)境，圖5.2-1右側(cè)）或接地電纜（“第二”環(huán)境，圖左邊的5.2-1）必須進(jìn)行連接（另見(jiàn)24“連接示例”）。
6臺(tái)變流器（專用）變壓器
轉(zhuǎn)換器（專用）變壓器直接傳輸高功率
從中壓線路到單個(gè)大型轉(zhuǎn)換器或本地多個(gè)轉(zhuǎn)換器的低壓線路（見(jiàn)20）。此外，它還采取行動(dòng)作為根據(jù)5所述的分離變壓器。
如果這種轉(zhuǎn)換器變壓器沒(méi)有屏幕，則EMC要求：然而，在大多數(shù)情況下，由于RF干擾能量很難通過(guò)中壓線路獲得公共線路至必須保護(hù)的負(fù)載的變壓器反對(duì)干擾。如有爭(zhēng)議，計(jì)量必須：在公共耦合點(diǎn)（公共低壓線）進(jìn)行根據(jù)EN 61 800-3，可使用市場(chǎng)上可用的所有金屬機(jī)柜；然而根據(jù)9，其安裝板必須具有良好的導(dǎo)電表面。
如果驅(qū)動(dòng)系統(tǒng)放置在多個(gè)機(jī)柜中，其安裝：板必須用寬大的導(dǎo)電板連接金屬
9.安裝板：安裝板必須由鋼制成，表面鍍鋅沒(méi)有任何繪畫(huà)。PE銅棒必須直接安裝在安裝板上，并且必須通過(guò)分布的多個(gè)螺栓與板連接沿其長(zhǎng)度以相等的距離。
10.安置
裝置轉(zhuǎn)換器、線路扼流圈、保險(xiǎn)絲、接觸器和EMC濾波器
放置在安裝板上，以便連接可以盡可能短，尤其是來(lái)自轉(zhuǎn)換器的通過(guò)線路扼流圈至過(guò)濾器，并滿足15中的要求滿足。待安裝的部件表面安裝板必須無(wú)涂層材料（見(jiàn)28）。Converters cause short-duration short circuits at their AC inputs, so
- called commutation notches. Such notches down to 0 V (100%
depth) can be accepted at the secondary windings of converter
(dedicated) transformers (operation without line chokes). However,
their depth must be reduced if the same transformer shall supply
more than two converters of comparable power. In such case line
chokes are necessary. They must cause about 1% relative voltage
drop at rated current. So - called 1% chokes are also necessary if
the power of the converter is very low compared with the available
power of the transformer or supply line. ABB offers suitable 1%
chokes.
According to the European product standard EN 61800-3, the
commutation notches must be kept below 20% of the line voltage
in the first environment, whereas an upper limit of 40 % is specified
for the second environment. This target can be achieved with the
aid of line chokes. The inductance of these chokes to be applied in
the first environment must have 4 times the value of the network
inductance at the converter’s connection point (point of common
coupling, PCC) as shown in Figure 5.2-3. Therefore in many cases
so-called 4% chokes are necessary, and therefore ABB offers also
suitable 4% line chokes besides the 1% chokes.Often the maximum current is not limited by the transformer but by the
power cable to the industry region. Therefore it is necessary to ask the
energy supply company concerning the line impedance and the current
which is available at the desired point of common coupling (PCC).A separation transformer makes line chokes unnecessary because
of its leakage inductance, and a grounded screen between its
windings saves an EMC filter, see 1 and 4. The screen and the iron
core must be well connected with the mounting plate of the converter. If the transformer is located outside the converter cubicle
the screen of a screened 3-phase cable ("first" environment, figure
5.2-1 at the right) or a ground cable ("second" environment, figure
5.2-1 at the left) must make this connection (see also 24 "Connection example").
6 Converter (dedicated) transformers
A converter (dedicated) transformer transfers high power directly
from a medium voltage line to a single large converter or to a local
low voltage line for several converters (see 20). Furthermore it acts
as separation transformer according to 5.
If such a converter transformer has no screen the EMC demands
are nevertheless fulfilled in most cases because the RF interference energy can hardly get via the medium-voltage line and the
transformer of the public line to the loads which must be protected
against pertubances. In the case of a dispute a measurement must
be done at the point of common coupling (public low - voltage line)
according to EN 61 800-3.All metal cubicles available on the market can be used; however,
their mounting plates must have well conducting surfaces according to 9.
If a drive system is placed in more than one cubicle their mounting
plates must be connected by broad pieces of well conducting sheet
metal.
9 Mounting plate The mounting plate must be made from steel with zinc surfaces
and without any painting. The PE copper bar must be mounted directly on the mounting plate without any insulating means between,
and it must be connected with the plate by several bolts distributed
in equal distances along its length.
10 Placement of
devices
The converter, the line choke, fuses, contactors and the EMC filter
are to be placed on the mounting plate so that the connections can
be made as short as possible, especially those from the converter
via the line choke to the filter, and that the requirements in 15 can
be fulfilled. The surface of the components to be mounted on the
mounting plate has to be free of coating material (see 28).