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| 型号： | 2277048 |
| 厂商： | Phoenix Contact |
| 文件页数： | 24/28页 |
| 文件大小： | 0K |
| 描述： | BUS-BAR CURRENT TRANSFORMER 5VA |
| 标准包装： | 1 |
| 变压器类型： | 频率 50-60Hz |
| 额定电流： | 250A |
| 安装类型： | DIN 轨道 |
| 端接类型： | 端接块 |
| 其它名称： | PACT MCR-V1-21-44-250-5A-1 PACTMCR-V1-21-44-250-5A-1 |
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PACT Analog
6
Selecting the optimum transformer
Once the technical specifications for the current
transformers required by the application have been defined,
Power requirement of copper cables with a different
diameter
the next step is to determine the transformer types.
Cable cross
Power in VA
The four main current transformer characteristics are:
section in mm 2 (consider the supply and return line)
1. Primary rated current (primary current I pn )
at 5 A
at 1 A
2. Secondary rated current (secondary current I sn )
3. Capacity (power) in VA
4. Accuracy (class)
The current transformer is selected first and foremost based
on the primary rated current I pn , which can be up to 4000 A
(depending on the type) and the secondary rated current I sn .
This is either 1 A AC or 5 A AC at the output.
The accuracy (class) can be another important criterion for
selecting the correct current transformer if certain
specifications have to be met.
Special attention, however, should be paid to the calculation
of the rated power (in VA). Here it is important to take into
1.5 0.2917 0.117
2.5 0.175 0.0070
4 0.1094 0.0044
6 0.0729 0.0029
I sn at 5 A AC:
P = 10 m x 2 x 0.175 VA ? P = 3.50 VA
I sn at 1 A AC:
P = 10 m x 2 x 0.007 VA ? P = 0.14 VA
consideration all occurring loads of the measuring circuit for
optimum selection of the rated power of the current
7
Installation and connection
transformer (see below).
Phoenix Contact offers an extensive range of current
transformer types. This means that several different types
may meet the prescribed technical criteria. The main
differences lie in the size and shape of the transformer
opening and in the external dimensions of the transformer
housing. This allows you to select an optimum current
transformer based on the size of the copper rail and the
space available in the control cabinet.
How do you choose the optimum current transformer?
Firstly, add together all occurring loads:
– Calculate the power requirement of the copper cable
(info: cable length x 2)
– Take into account the power requirement of the
connected devices
– Add the reserve requirement
The optimum current transformer is one which can
accommodate a maximum of 1.5 times the total load.
This is because underloads affect accuracy and impair the
overcurrent limiting protection, which protects the
secondary circuit from being damaged by excessive
currents.
Current transformers from Phoenix Contact can be
positioned anywhere.
Thanks to the primary rail support of the PACT Analog
current transformer which can be pulled out, no edges
protrude from the housing. Instead all edges are flush. This
is the basic prerequisite for the parallel attachment and
positioning of the current transformers on the copper rail,
which thus enables currents and loads supplied via an
electric branch to be measured. To this end, a copper
sleeve (accessory) is inserted into the internal opening of
the current transformer, which creates a conductive
connection between the current-carrying copper rail and,
e.g., the securing lug of a downstream fuse. To increase the
air and creepage distances, an extended secondary
terminal cover (accessory) is placed over the connections of
the secondary terminals of the horizontal current
transformer.
103359_en_03
PHOENIX CONTACT
24
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| 2277051 | 功能描述:电流变压器 PACT MCR-V1-21- 44-400-5A-1 RoHS:否 制造商:EPCOS 安装风格: 电感:320 uH 电流额定值: 匝数比: 次级线圈电阻:1140 mOhms 端接类型:SMD/SMT 长度:8.13 mm 宽度:7.11 mm 高度:5.08 mm 频率: |
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| 2277080 | 功能描述:电流变压器 PACT MCR-V2-3015- 60- 250-5A-1 RoHS:否 制造商:EPCOS 安装风格: 电感:320 uH 电流额定值: 匝数比: 次级线圈电阻:1140 mOhms 端接类型:SMD/SMT 长度:8.13 mm 宽度:7.11 mm 高度:5.08 mm 频率: |
| 2277093 | 功能描述:电流变压器 PACT MCR-V2-3015- 60- 400-5A-1 RoHS:否 制造商:EPCOS 安装风格: 电感:320 uH 电流额定值: 匝数比: 次级线圈电阻:1140 mOhms 端接类型:SMD/SMT 长度:8.13 mm 宽度:7.11 mm 高度:5.08 mm 频率: |
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