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Questions tagged [current-transformer]

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1
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2answers
95 views

Safe voltage for hydrolysis of water - teacher demo

I am a science teacher and looking to perform an experiment with my students. I do not have much background in electricity. My students will be performing hydrolysis of water using a 9v battery. ...
0
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0answers
22 views

Readings for a current transformer reversed

What would happen to the measured values of a circuit (real power, apparent power, power factor, current) if I install a current transformer "backwards"? Usually a current transformer has some ...
0
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1answer
56 views

Amplifing the output of a current transformer sensor [closed]

I have to make a current transformer sensor from scratch for one of my projects this semester. I bought a torroid ferrite core and wrapped a copper wire around it. Plan was to thread a wire as the ...
2
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2answers
194 views

Why is the secondary winding of a current transformer shorted?

I understand that the secondary circuit in a current transformer cannot be left open, as it will result in a very potential difference being induced in the core of the transformer and permanently ...
0
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1answer
39 views

3 Phase Energy Meter to measure multi channel

Can I use single 3-phase energy meter to measure multiple 3 phase load using multiplexing relays for the CT outputs? For example like below picture. The intention is to log data for multiple 3-phase ...
0
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2answers
76 views

How can I use a US 120 volt Ryobi charger From a 220 volt main? [closed]

I bought a ryobi kit in the us and I want to use it in in Europe. I doubt that I can plug it directly into the socket, what kind of converter/adapter do I need? Is there a way to adapt the charger ...
0
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1answer
141 views

Is Current Transformer secondary current independent of load impedance? and How to find voltage of CT Secondary side?

i am trying to figure out a CT (Current Transformer) which is installed in my device of analysis. This CT has Two wires passing through its center hole (one is phase/red wire of single Phase AC supply ...
1
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3answers
104 views

Power meter current transformer: possible to sum mutiple phases

I am currently looking at this inexpensive power meter modules with TTL interface. It seems to use internally the same ASIC as many chinese wall-wart power meters: It comes with a current transformer ...
0
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2answers
360 views

Current transformer (CT) and potential transformer (PT) grounding

There is several documents say that for three-phase instrument transformers (CT,PT), there should be only one grounding point. With this argument, can I short the the secondary sides of current ...
0
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0answers
1k views

How to avoid noise in YHDC SCT-013-000 current transformer?

I have a SCT-013-000 current transformer which I have connected to Arduino Uno with a burden resistor of 33 ohms and the calibration value I am using is 60. The problem is we are getting current ...
1
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3answers
467 views

Current Transformer (CT) and Potential Transformer (PT) Sensors - How to Measure Electrical Power Usage?

I am not from Electrical Engineering background and so, does not have much idea about how energy power meters work. I want to measure electrical power usage of a three-phase induction motor. So, I ...
0
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1answer
86 views

Step up voltage Transformer for more watt?

Using generator in mountain or underground tunnel location, construction workers from portable generator gets maximum: AC Output: 220volt as 200 to 250watt Now, they need to use a machine for ...
0
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0answers
368 views

Using a current transformer with an Arduino Uno

I have a current transformer CR3110 - 3000 It will be used to detect the state of different loads (100w, 1000w, ...). The intention is to use Arduino Uno, to detect voltage in the range 0-5V, like it ...
0
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1answer
207 views

Current transformer datasheet: confusion on turns ratio vs. max. rated currents

I have a SCT-013-000 current transformer that says it scales 100A:50mA, meaning it has a turns ratio of 1:2000, but the data sheet says that the turns ratio is 1:1800. I'm pretty sure the turns ...
-2
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1answer
57 views

Coordinated relay tripping for Protection in Modern Power System

I have been working on Etap Software to understand the basic protection scheme using Current Transformer, circuit breaker and Relays. But i am having trouble in the coordination of the tripping in the ...
0
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1answer
36 views

Advice needed for split core clamp-on power monitoring circuit

I am trying to get started with the analog end of a circuit to measure power with a split core transformer. I'm wondering if I can get any pointers about what kind of circuits I might need right ...
0
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2answers
348 views

how to get a clean AC current waveform for power-factor calculations

I've been doing a project to figure out the power factor of a load by comparing the zero crossings of the voltage and current signals (of a AC signal) and hence finding the phase difference using an ...
1
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2answers
2k views

AC Current Sensing Switch Using Current Transformer

I'm struggling to design a circuit that will interpret signals from a SCT013 current transformer and trigger a constant 5v signal (which will go to a microcontroller) when a certain current threshold ...
1
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2answers
452 views

Amplify DC output from CT circuit

I am new to your forum although I often read it and find great help. I have a problem that I cannot resolve. I am using a 5A CT (1000:1) to measure 110VAC (50Hz) currents of 70 to 90mA which gives me ...
0
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1answer
83 views

Current Transformator “Rb”

While i was looking for STPM32 Energy meter chip, i saw a ratio named Rb[V/A]. I really searched at Google for it but really can't be sure what is exatcly is. And my X5 currunt transformer's ...
0
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2answers
108 views

Need help interpreting a Energy Meter datasheet

I am reading this datasheet for an energy meter, to start understanding how this market works. A friend of mine wants to make a test in a small office building to see if it pays having one of these ...
0
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2answers
2k views

Can I use a current transformer to measure voltage and current?

I am trying to make a very basic energy meter that is basically an Arduino (a random microcontroller) attached to a Current Transformer (CT) that I can clamp around an electric cable in an electric ...
0
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3answers
352 views

Transformer Isolation

What I would consider two basic facts about electricity are conflicting (to my understanding, obviously not in real life). I know it's said that a transformer provides isolation. I think I remember ...
2
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4answers
178 views

Can a time-varying magnetic field pass a metal sheet?

I'm using CT (Current Transformer) to measure the current flowing on the power line. The frequency of the current is 13.56 MHz. CT appeared to be metal-shielded (This metal case of CT may be to be ...
0
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1answer
7k views

Current Transfomer (CT) ratio setting on energy meter

I am using a smart energy meter which allows me to set the CT ratio among other parameters. I am using 50/5 ratio AC CT's. For the meter to do the kwh calculation correctly, I believe I have to set ...
4
votes
1answer
2k views

Current transformer and bridge rectifier — why the diode drop?

I'm building a circuit to measure AC current using a current transformer, which feeds into a microcontroller's ADC for the actual measurement. As the measurement needs to be fairly accurate, the ...
2
votes
2answers
115 views

How both current and voltage values obtained at secondary of CT are in range of milli-volt/ ampere?

I have a power distribution unit (PDU) used in servers . It has current rating of 32 A. I want to measure this current and convert it into proportional voltage using CT (current transformer). The ...
1
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3answers
785 views

How do current transformers work?

I'm interested in generating reasonably high amounts of current (50-100 amps), and I was wondering how to go about making that much current without insane amounts of voltage. I've read about current ...
2
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3answers
2k views

How to convert current obtained from CT to precise voltage applied as input to ADC?

My aim is to convert current obtained from CT to precise voltage that can be applied as input to ADC. As shown in the diagram , a conductor carries current of up to 63 A passes through the ...
0
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2answers
337 views

Voltage drop in Vin of 7805 regulator when used with a Bridge rectifier and CT(Current Transformer)

I have a voltage regulator circuit powered by a CT. I rectify the output AC voltage to DC voltage and provide that as an input to the regulator L7805CV. My input voltage is about 7.20V When I connect ...
0
votes
1answer
744 views

Modeling A Current Transformer in FEMM

I would like to accurately design and model a current transformer in FEMM. I'm hoping this will enable me to accurately estimate the secondary current in a current transformer, including it's phase ...
0
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2answers
1k views

How can I connect a CT clamp (AC Current sensor) to a multimeter?

I have ths CT clamp (with a 3.5 mm jack on the end): https://openenergymonitor.org/emon/buildingblocks/report-yhdc-sct-013-000-current-transformer How do I connect the clamp output to the multimeter ...
0
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3answers
482 views

How to test a CT Sensor (Alternating Current Clamp)?

I recently purchased a CT clamp. I am left wondering what the best way is to test this in a laboratory environment, specifically with an AC current generator. I just want to know whether the device ...
1
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1answer
329 views

Half Bridge Converters - Primary Current Sensing Without Current Transformer

I'm studying on half-bridge topology and a lot of schematics show that primary current is sensed by a current transformer (1:50, 1:100 etc). I'm quite familiar with flyback and forward converters ...
2
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1answer
67 views

Transformer Coils

If a transformer's primary or secondary coil is just un-insulated copper wire, why dosent the current take the path of least resistance, why does it want to go around the whole coil? Please help, ...
2
votes
1answer
123 views

Lowering the output of high amp current sensor for low amp use - good or bad?

By increasing the value of burden resistor or turning the wire several times around the CT an output can be increased. But is it a good practise to lower the high current non-invasive current sensor ...
0
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1answer
130 views

measuring resistances of CT

Mayby, Sorry for a basic question. When measuring CT working okay in maintenance, somebody say that the resistance of 0 & (+Vc) and 0 & (-Vc) should have similar values. Buu, I wonder why ...
8
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2answers
872 views

dual of voltage doubler

Voltage doublers, like those close to be one stage of Cockroft-walton multipliers, are well known. They allow to double the voltage of an AC input and can be useful at the output of a transformer for ...
3
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1answer
64 views

AC power measurement query

I'm trying to understand and tweak this smartplug reference design from TI. I'm stumped on the Metrology Analog Filters section on page 1. What I do not understand is why is there a 0R resistor on the ...
1
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2answers
3k views

current transformer in reverse

What will happen if I connect current transformer in reverse direction, means instead of applying current in primary if I apply some mA of current in secondary(less than the rated secondary current) ...
-1
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1answer
317 views

how i can get 5V AC output from 230V AC [closed]

how can'i get 5 V AC output 230 V AC: input? for a measurement unit bases on DSP?
1
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4answers
1k views

How safe is a current transformer

I acknowledge that the subject line indicates a "how long is a piece of string" style question, but I hope to make it more specific below. I have a "current transformer" (CT) purchased as part of an ...
0
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1answer
248 views

Current Transformer properties

I have a mains track (230VAC, 50Hz) on a custom PCB routed to multiple Solid-State Relays, and I want to measure the power going through this line. I'm looking into Current Transformers (CTs) to ...
5
votes
2answers
1k views

How much open circuit voltage can a C.T. generate if burden is removed

The CT types I'm thinking of are those used for the general monitoring of household currents. Myth or truth, will a regular CT (in an otherwise normal and suitable current monitoring situation) ...
1
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2answers
123 views

Transformer in series?

I've see people asking about transformers in series to get high voltage but what about transformers in series to get 6v, 600amps? I'm at 3v 600 amps currently but I want to bump up the voltage without ...
1
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2answers
261 views

Testing a current transformer sensor - I had to reduce input voltage to get lower primary currents. Are my results valid?

I have a CT current sensor which, according to the datasheet, has a 62\$\Omega\$ burden resistor. I have logged the output voltage for primary currents from 1mA to 10A. However, to obtain the lower ...
5
votes
2answers
1k views

Capacitor for current transformer measurement circuit

I want to measure an AC current with a current transformer and an arduino device. I found on a website (http://www.homautomation.org/2013/09/17/current-monitoring-with-non-invasive-sensor-and-arduino/)...
1
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2answers
315 views

Can I drive a led light with help of a CT clamp

If I have a 230V wire with alternating current and a load in the far end, drawing current. Could you "steal" energy with a CT illustrated in the image, to for example drive a led light? BR Chris
6
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2answers
1k views

Drawing current sensing transformers accurately

This is more of a stylistic question than anything else, but it important that the sketch be accurate to convey what is really going on. I'm wondering, how does one draw a current loop that is ...
3
votes
1answer
438 views

Current transformer minimum frequency

I need a current transformer for an induction heating project. After searching Digi-Key for a transformer meeting my specifications (turns ratio, current, mounting type, etc.), the cheapest model I ...