How to turn a current transformer into a voltage source to start a coil of an intermediate relay

This is not possible because the current transformer is designed as a current sensing device, which is used in series with the load.

Therefore, its primary winding has a small number of turns and a large wire diameter, which can withstand large currents, but the voltage drop at both ends of it is very small, otherwise it will affect the circuit under test. If it is used as a voltage source, its primary level will inevitably need to be connected to a higher voltage, which will produce a large current, and the upper power supply and itself will be burned.

Moreover, even if the primary is not burned out, the voltage of the secondary is so high that no intermediate relay can withstand it.

The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is made up of a closed core and windings. Its primary side winding turns are very small, stringed in the line of the current that needs to be measured, so it often has all the current of the line flowing through, the number of turns of the secondary side winding is more, connected in series in the measuring instrument and the protection loop, when the current transformer is working, its secondary side loop is always closed, so the impedance of the series coil of the measuring instrument and the protection loop is very small, and the working state of the current transformer is close to short circuit.

The current transformer converts the large current on the primary side into a small current on the secondary side for measurement, and the secondary side cannot be opened.

It's not going to work. The current transformer is a current source, but an intermediate relay can be actuated by a sample drive.

Our company's product is a voltage source made of current transformer, connected to 68K resistor, voltage 30V, the current is very small, and the primary current is very large.

Summary. The current transformer P1 in the figure is terminated with the A1 ammeter, and the A2 terminal is connected in series with the P2 terminal of the transformer to ground. Wiring method diagram of thermal overload protection This wiring method is actually the same as the wiring method of the ammeter, the same is that the P1 end is connected to the incoming end of the thermal relay respectively, and the outgoing end is connected to the ground with the P2 end of the transformer after shorting.

As we all know, the secondary side of the current transformer should never be opened. Because the current transformer is a step-up transformer, in the state of open circuit, the secondary side will generate high voltage, which is prone to electric shock accidents to the human body. Therefore, the secondary side must be shorted when not in use.

The easiest way to do this is to connect the wires directly from the P1 and P2 ends. When P1 is terminated at P2, P1 and P2 can be reconnected to their respective positions.

The current transformer P1 in the figure is terminated with the current gear A1, and the A2 end is connected in series with the P2 end of the transformer to ground. Wiring method diagram of thermal overload protection This wiring method is actually the same as the wiring method of the ammeter, the same is that the P1 end is connected to the incoming end of the thermal relay respectively, and the outgoing end is connected to the ground with the P2 end of the transformer after shorting. As we all know, the secondary side of the current transformer should never be opened.

Because the current transformer is a step-up transformer, in the state of open circuit, the secondary side will generate high voltage, which is prone to electric shock accidents to the human body. Therefore, the secondary side must be shorted when not in use. The easiest way to do this is to connect the wires directly from the P1 and P2 ends.

When P1 is terminated at P2, P1 and P2 can be reconnected to their respective positions.

The primary side current of the current transformer enters from the P1 terminal and comes out from the P2 terminal; That is, the P1 terminal is connected to the power supply side, and the P2 terminal is connected to the load side. The current on the secondary side of the current transformer flows out from S1 and enters the positive binding post of the current gear panel, and the negative binding post of the ammeter flows into the secondary terminal S2 of the current transformer after the grip is eliminated, and the S2 terminal is required to be grounded in principle. Some electric current transformers are nominal at the primary level, L1 and L2, and the secondary side is nominal K1 and K2.