How can the transformer have K1K2 and S1S2?

Current Transformers:

Current transformer terminals.

The marking should indicate the primary winding and the secondary winding; winding segments (if any); the polarity relationship between the winding segments and the winding segments; Middle tap (if any).

The primary terminal of the current transformer is generally identified with P1P2, and the secondary terminal is generally identified with S1S2.

Voltage transformers:

The terminal marking of the voltage transformer should be selected according to the diagram in the next section.

The uppercase letters A, B, C, and N on the voltage transformer terminals indicate the primary winding terminals, while the lowercase letters A, B, C, and N indicate the corresponding secondary winding terminals.

The voltage transformer terminals are marked with capital letters A, B, and C for fully insulated terminals, while the letters N indicate ground terminals, which have lower insulation properties than other terminals.

The voltage transformer terminals are marked with the compound letters DA and DN to indicate the winding terminals that provide the residual voltage.

The above is excerpted from GB 1207-2006 Electromagnetic Voltage Transformers.

L1 L2 (P1, P2) is generally the primary side of the current transformer, and K1, K2 (S1, S2) is generally defined as the secondary side.

The target is different for different manufacturers, but most of them are S1S2, and the connection method is the same.

The primary winding mark of the current transformer is P1 and P2, and the secondary winding mark is S1 and S2. If P1 and S1 are the same name, then this sign is called reduced polarity. The primary current enters from P1 and the secondary current comes out from S1.

The polarity check is simple, and in addition to being able to check on the transformer calibrator, the DC check method can also be used.

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.

K1 and K2 are the outlets of the secondary windings of the transformer. It is used to indicate the polarity relationship with the primary winding. The K1 of the secondary winding is the same polarity as the P1 terminal of the primary winding, and the K2 of the secondary winding is the same polarity as the P2 terminal of the primary winding.

The primary current flows from P1 to P2, and the secondary current flows from K1 and flows from K2.

Instrument transformer, also known as instrument transformer, is a general term for current transformer and voltage transformer. It can turn high voltage into low voltage and high current into small current for measurement or protection system. Its function is mainly to convert high voltage or high current into standard low voltage (100V) or standard low current (5A or 1A, both refer to rated values) in proportion, so as to realize the standardization and miniaturization of measuring instruments, protection equipment and automatic control equipment.

At the same time, the transformer can also be used to isolate the high-voltage system to ensure the safety of people and equipment.

The shorting of S1 and S2 on the secondary side of the current transformer will not be a problem, which will cause a reduction in the number of meters.

Several requirements for current transformer wiring.

An open circuit is not allowed on the secondary side of the current transformer.

The second open circuit may have serious consequences, one is that the iron core is overheated, and even the transformer is burned; Second, due to the large number of turns of the secondary winding, it will induce dangerous high voltage, which endangers the safety of people and equipment.

The secondary side of the high-voltage current transformer must have a little grounding.

Since the primary side of the high-voltage current transformer is high-voltage, when.

1. When the high voltage breakdown of the outgoing line due to insulation damage between the secondary coils will cause the high voltage to enter the low voltage, and if the secondary coil is grounded at one point, the high voltage will be introduced into the ground, which can ensure the safety of people and equipment. However, it should be noted that the secondary circuit of the current transformer is only allowed to be grounded at one point, and no more grounding is allowed, otherwise it may cause shunting and affect the use.

The secondary coil of the low-voltage current transformer should not be grounded.

Due to the low voltage of the low-voltage transformer, the insulation between the primary and secondary coils is large.

In addition, the non-grounding of the secondary coil will improve the insulation capacity of the secondary circuit and the instrument, and can also reduce the lightning burn instrument accident.

1.In addition to S1 and S2, the current transformer is marked with P1 on the front and P2 on the back, when the current is from top to bottom, P1 is on the top and P2 is on the bottom, and S2 is grounded;

2.If the installation is not optimistic, and the current transformer is not easy to disassemble and re-safe, when the current is from top to bottom, P2 is on top and P1 is down, and S1 is grounded, and the effect is the same.

Then the mutual inductor current is not metered.

First of all, I want to be clear about whether your transformer is a voltage transformer or a current transformer?