Other Transformers

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Other Transformers

Multi tap current transformer. In this type of current transformer, the primary winding is the same, when winding the secondary winding, several taps are added to obtain multiple different transformation ratios. It has a core and a fixed number of turns of the primary winding. The secondary winding is wound on the insulating cylinder which is sheathed on the core with insulated copper wire. The tap of the secondary winding with different transformation ratio is led out and connected on the terminal block. Each tap is provided with its own terminal, so that multiple transformation ratios are formed. The advantage of this current transformer is that it can be adjusted according to the transformation ratio of load current It is convenient to change the transformation ratio by changing the wiring of the secondary terminal without changing the current transformer.

Current transformer with different transformation ratio. This type of current transformer has the same core and primary winding, while the secondary winding is divided into two windings with different turns and independent each, so as to meet the needs of different transformation ratio and different accuracy level under the same load current. For example, under the same load, in order to ensure the accuracy of electric energy measurement, the transformer is required to be smaller (to meet the requirements of the load current in the primary amount About 2 / 3 of the setting value), the accuracy level is higher (for example, 1k1.1k2 is 200 / 5.0.2); for the relay protection of electrical equipment, considering the large protection coefficient of fault current, it is required to be larger, and the accuracy level can be slightly lower (for example, 2k1.2k2 is 300 / 5.1).

Primary winding adjustable, secondary multi winding current transformer. The characteristic of this kind of current transformer is that it has more transformer than measuring range, and it can be changed. It is often seen in high-voltage current transformer. The primary winding is divided into two sections, passing through the iron core of the transformer, and the secondary winding is divided into two independent windings with taps and different accuracy levels. The primary winding is connected with the connecting piece outside the transformer. By changing the position of the connecting piece, the primary winding is connected in series or in parallel, so as to change the number of turns of the primary winding and obtain different transformation ratio. The secondary winding with tap can be divided into two windings with different transformation ratio and different accuracy level. With the change of the position of the connecting piece of the primary winding, the number of turns of the primary winding changes correspondingly, and the transformation ratio changes accordingly, thus forming a multi range transformation ratio. The different transformation ratio and accuracy grade of the secondary independent winding with tap can be applied to electric energy measurement, indicating instrument, transmitter, relay protection, etc. to meet the different requirements of their own use.

Combined current and voltage transformer. The combined transformer is composed of the current transformer and the voltage transformer, which are mostly installed in the high-voltage measuring box and cabinet, and used as the power for measuring electric energy or using the relay protection device of the electric equipment. The combined current and voltage transformer is to fix the primary and secondary windings and cores of two or three current transformers and the primary and secondary windings and cores of the voltage transformer on the steel frame and dip them into the box with transformer oil. The outgoing lines of the primary and secondary windings are led out and connected to the high and low voltage porcelain bottles outside the box to form an insulated and closed whole. The primary side is connected with the power supply line, and the secondary side is connected with the metering device or relay protection device. According to different needs, the combined current and voltage transformer can be divided into v / V connection and Y / Y connection to measure the electric energy when the three-phase load is balanced or unbalanced.