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Holzer open loop open open AC current transmitter 500aMCU measurement 200/240/250/300/90A

Using precision constant current technique and linear temperature compensation technology, the process of non control variables (consumption) linear isolation is converted into standard variable DC signal output for DC3V3.3V4V5V10V4-20ma20ma PLC or DCS, DSP, MCU, data acquisition card, MCU paperless recorder data acquisition system for data processing A/D conversion or pretreatment provides a standard current signal

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1 霍尔开环开口式交流电流变送器500a MCU测量200/240/250/300/90 A的原理:原边电流IP产生的磁通被高品质磁芯聚集在磁路中,霍尔元件固定在很小的气隙中,对磁通进行线性检测,霍尔器件输出的霍尔电压经过特殊电路处理后,副边输出与原边波形一致的跟随输出电压,此电压能够精确反映原边电流的变化 . a 霍尔电流传感器可以测量各种类型的电流,从直流电到几十千赫兹的交流电,其所依据的工作原理主要是霍尔效应 b 当原边导线经过电流传感器时,①原边电流IP会产生磁力线,②原边磁力线集中在磁芯周围,③内置在磁芯气隙中的霍尔电极可产生和原边磁力线成正比的大小仅几毫伏的电压,④电子电路可把这个微小的信号转变成副边电流IS,⑤并存在以下关系式: c 当原边电流IP流过一根长导线时,在导线周围将产生一磁场,这一磁场的大小与流过导线的电流成正比,产生的磁场聚集在磁环内,通过磁环气隙中霍尔元件进行测量并放大输出,其输出电压VS精确的反映原边电流IP。一般的额定输出标定为4V。
Advantages of Holzer sensor
1. 测量范围广:它可以测量任意波形的电流和电压,如直流、交流、脉冲、三角波形等,甚至对瞬态峰值电流、电压信号也能忠实地进行反映;
2. 响应速度快:最快者响应时间只为1us。
3. 测量精度高:其测量精度优于1%,该精度适合于对任何波形的测量。普通互感器是感性元件,接入后影响被测信号波形,其一般精度为3%~5%,且只适合于50Hz 正弦波形。
4. 线性度好:优于0.2%
5. 动态性能好:响应时间快,可小于1us;普通互感器的响应时间为10~20ms。
6. 工作频带宽:在0~100KHz 频率范围内的信号均可以测量。
7. 可靠性高,平均无故障工作时间长:平均无故障时间>5 10 小时
8. 过载能力强、测量范围大:0---几十安培~上万安培
9. 体积小、重量轻、易于安装。
霍尔开环开口式交流电流变送器500a MCU测量200/240/250/300/90 A应用 可广泛应用与变频调速装置、逆变装置、UPS 电源、逆变焊机、电解电镀、数控机床、微机监测系统、电网监控系统和需要隔离检测电流电压的各个方面包括动力、车身控制、牵引力控制以及防抱死制
It is used to measure, control and protect direct current of aluminum, chlor alkali, nonferrous metal smelting and so on. The range of current measurement can be measured by 500KA. High precision, wide range of working temperature.
 
电流传感器因厂家不同有各自的技术类型,选择电流传感器时主要要选择好电流、精度、带宽等值。生产电流传感器的厂家很多,也有很多国外的品牌。我使用的是LEM。感觉不错,售后一般。技术支持很不错。 d 电流感应器: 通过测量置于电流路径上的电阻上的压降来监视电流的电路(尽管存在着其它技术,例如磁相关技术,但这里的讨论仅限于并联电阻电流测量)。(参见图 1)电流传感器输出一个与通过测量路径的电流成比例的电压或电流 霍尔电流传感器具有以下优点:
1、 霍尔传感器可以测量任意波形的电流和电压,如:直流、交流、脉冲波形等,甚至对瞬态峰值的测量。副边电流忠实地反应原边电流的波形。而普通互感器则是无法与其比拟的,它一般只适用于测量50Hz正弦波;
2、 原边电路与副边电路之间有良好的电气隔离,隔离电压可达9600Vrms;
3, high precision: the precision in the working temperature zone is better than 1%, and this precision is suitable for any waveform measurement.
4. The linearity is good: better than 0.1%;
5, broadband bandwidth: high bandwidth current sensor can rise less than 1 s. However, the voltage sensor bandwidth is narrow, generally within 15kHz. The 6400Vrms voltage sensor rises about 500uS and the bandwidth is about 700Hz.
6. Measurement range: the Holzer sensor is a series of products, the current measurement can reach 50KA, and the voltage measurement can reach 6400V.
 
B 霍尔开环开口式交流电流变送器500a MCU测量200/240/250/300/90 A使用时,需遵循以下注意事项:
1, in order to get better dynamic characteristics and sensitivity, we must pay attention to the coupling between the primary coil and the secondary coil. It must be coupled well. It is better to use a single conductor and the conductor completely fills the aperture of the Holzer sensor module.
2, when the DC current flowing through the primary coil of the sensor, and the secondary circuit is not connected to the power regulator or | side open circuit, the magnetic circuit is magnetized, and remanence affects the measurement accuracy (when used to first turn on the power and the measuring end M), when this happens to demagnetization processing. The method is that the secondary circuit does not add power, and the same level of AC current is passed in the original coils and the value is gradually reduced.
3, Holzer sensors have strong ability to resist external magnetic field interference. However, in order to get higher measurement accuracy, when there are strong magnetic field interference, we should take appropriate measures to solve them. The usual methods are:
Adjust the direction of the module to minimize the effect of the external magnetic field on the module.
Cover a metal shield with an anti magnetic field on the module.
4, the best accuracy of measurement is obtained at rated value. When the measured current is far below the rated value, we need to get the best accuracy and the original side can use multiple turns, but we need to pay attention to the spatial location of the wire.
The 5 current sensor must choose the products of different specifications according to the rated current value of the measured current. The long time excess of the measured current will damage the terminal power amplifier (the magnetic compensation). In general, the duration of the 2 times overload is not more than 1 minutes.
6, the voltage sensor must introduce a current limiting resistor R1 at the original side according to the product description, so that the primary side can get rated current. Under normal circumstances, the overvoltage duration of 2 times shall not exceed 1 minutes.
The best accuracy of 7 current voltage sensor is in the primary side of the rated value under the conditions, so when the measured current is higher than the rated current sensor, sensor should be chosen correspondingly large; when the measured voltage is higher than the rated value of the voltage sensor, should adjust the current limiting resistor. When the measured current is lower than the rated value is below 1/2, in order to get the best accuracy, can use multiple cycles of way.
8) the insulation and withstand voltage 3KV sensor can work normally in the 1KV and below AC system and 1.5KV and below DC system for a long time.
The use of unit 9 at the request of good dynamic characteristics when using a single copper busbar and the best aperture with big generation small or more cycles, will affect the dynamic characteristics.
10 在霍尔传感器大电流直流系统中使用时,因某种原因造成工作电源开路或故障,则铁心产生较大剩磁,是值得注意的。剩磁影响精度。退磁的方法是不加工作电源,在原边通一交流并逐渐减小其值。
The 11 sensor's ability to resist external magnetic field is a current of 2 times the original current value of the distance sensor 5 to 10cm, which is more than the original side current of the sensor, and the magnetic field interference can be resisted. The interphase distance should be more than 5 ~ 10cm when the three phase large current wiring is made.
12 in order to make the sensor work in the best measurement state, it is best to use the voltage regulator.
The saturation point and saturation point of the 13 sensor make it strong overload capacity, but overload capacity is limited by time. Overload capacity of over 2 times can not exceed 1 minutes when testing overload capacity.
14原边电流母线温度不得超过85℃,这是ABS工程塑料的特性决定的,用户有特殊要求,可选高温塑料做外壳。 a 除了安装接线、即时标定校准、注意传感器的工作环境外,通过下述方法还可以提高测量精度:霍尔开环开口式交流电流变送器500a MCU测量200/240/250/300/90 A
 

 

JLKT-8 AC600A/DC4-20ma

 

Pulsating Holzer current transmitter

work environment

ambient temperature

-25℃~+80

Storage temperature

-40℃~+115

relative humidity

90%

Pressure condition

Normal atmospheric pressure

Electrical parameters

Rated current range

AC600A

Error nonlinearity

0.1%

output voltage

@Ip=±Ipn    DC5±1%V

 

Measuring current range

AC1000A

Overload multiplier

Infinite

working frequency

0-40hz

Working power supply

±15V±5%V

Power waste

+35 -20ma

Insulation impedance

 

Dielectric Strength

2.5kV50hz1Min)

Temperature drift of offset voltage

@-40-85≦±1MV/℃

Output voltage temperature drift

@-40-85≦±1MV/℃

Zero point current

4±0.1ma

Linearity

@Ipo=0±Ipn≦1%FS

response time

@50A/us 10-90% 5us

bandwidth

0-3Db 40-20khz

Mechanicsparameter

First wear core

Diameter of inner hole38mm

Shape size

94*85*24

Two terminal

508Terminal connection

Terminal length

 

Shell

PBTFlame retardant material

Potting

EpoxyEpoxy resin adhesive

weight

195g

tolerance

±0.3mm

Offset voltage

@Ipo ≦±0.1ma

Magnetic misalignment voltage

@Ipo=±Ipn-0   ≦±0.1ma