CN210743756U

CN210743756U - Transformer wiring circuit

Info

Publication number: CN210743756U
Application number: CN201920885102.4U
Authority: CN
Inventors: 程雪忠
Original assignee: Guangdong Rafael Electric Co ltd
Current assignee: Guangdong Rafael Electric Co ltd
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2020-06-12
Anticipated expiration: 2029-06-12

Abstract

The utility model discloses a transformer wiring circuit, which comprises a live wire wiring end, a zero line wiring end, an input coil, a first output end and a second output end, wherein the input coil is wound on an iron core, one end of the input coil is connected with the live wire wiring end, and the other end is connected with the zero line wiring end; the first output end is connected to an input coil, one end of the input coil, which is connected with the zero line wiring end, is defined as a negative input end, and the second output end is connected with the negative input end. The utility model discloses a primary coil and secondary coil are formed around on same iron core by same copper line, consequently can two wiring ends meet the zero live wire wantonly and can not burn out. When the primary coil is energized, an alternating magnetic flux is generated in the iron core, and a varying potential is generated in the secondary coil due to the law of electromagnetic induction.

Description

Transformer wiring circuit

Technical Field

The utility model relates to a transformer technical field especially relates to transformer wiring circuit.

Background

At present, a transformer is a device for changing an alternating voltage using the principle of electromagnetic induction, and main components are a primary coil, a secondary coil, and an iron core (magnetic core). The main functions are as follows: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), and the like. According to the application, the method can be divided into: power transformers and special transformers (furnace transformers, rectifier transformers, power frequency test transformers, voltage regulators, mining transformers, audio transformers, intermediate frequency transformers, high frequency transformers, etc.). The coil has two or more windings, wherein the winding connected with the power supply is called a primary coil, and the rest windings are called secondary coils. It can transform alternating voltage, current and impedance. The simplest iron core transformer consists of an iron core made of soft magnetic material and two coils with different turns sleeved on the iron core.

Currently, two connections are common for transformer windings, namely delta connection and star connection. The delta connection method is that all phase power supplies or loads are sequentially connected end to end, and each connected point is led out to be used as three phase lines of three-phase power. The delta connection method has no neutral point, and no neutral line can be led out, so that only a three-phase three-wire system is provided. After the ground wire is added, three-phase four-wire system and three-phase power with delta connection are formed, the line voltage is equal to the phase voltage, and the line current is equal to √ 3 times of the phase current. The three windings of the form connection (Y-connection) are connected with each end of one phase of three-phase voltage, and the other ends are connected together, and are not connected with any phase of electricity or zero line, so that the voltage of each winding is phase voltage, namely voltage of each phase to ground, namely 220V generally. The star connection method is to connect one end of a three-phase power supply winding or a load together to form a neutral line, and because the current in the neutral line of balanced three-phase power is zero, the neutral line is also called a zero line: and leading-out wires at the other end of the three-phase power supply winding or the load are three phase wires of three-phase electricity respectively. When the remote power transmission is carried out, only three phase lines are used, and a three-phase three-wire system is formed. The circuit to the user usually involves two voltages, 220V and 380V, and three phase lines and one zero line are needed to form a three-phase four-wire system. In order to avoid electric shock accidents caused by electric leakage, a user needs to add an earth wire, and at the moment, three phase lines, a zero line and an earth wire are arranged, so that the user also has a three-phase five-wire system.

However, the conventional mounting method has the following defects:

the two wiring modes are limited to fixed wiring, and if the live wire and the zero wire are connected in a wrong way, the transformer can be burnt out.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a transformer wiring circuit, which can overcome the technical defect that the transformer can be burnt out if alternating current live wire and zero line are reversely connected in the prior art.

The utility model discloses a following technical scheme realizes:

the transformer wiring circuit comprises a live wire wiring end, a zero wire wiring end, an input coil, a first output end, a second output end, a primary coil and a secondary coil, wherein the input coil is wound on an iron core; one end of the input coil is connected with the live wire terminal, and the other end of the input coil is connected with the zero line terminal; the first output end is connected to an input coil, one end of the input coil, which is connected with the zero line wiring end, is defined as a negative input end, and the second output end is connected with the negative input end.

Furthermore, a restorable fuse is connected in series between the input coil and the live wire terminal or the zero wire terminal.

Further, the resettable fuse is a normally closed resettable fuse.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses a primary coil and secondary coil are formed around on same iron core by same copper line, consequently can two wiring ends meet the zero live wire wantonly and can not burn out. When the primary coil is energized, an alternating magnetic flux is generated in the iron core, and a varying potential is generated in the secondary coil due to the law of electromagnetic induction.

Drawings

Fig. 1 is a circuit structure diagram of the transformer wiring circuit of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

As shown in fig. 1, the utility model provides a transformer wiring circuit, it includes live wire terminal a, zero line terminal B, input coil L, first output end C and second output end D, input coil L is around establishing on the iron core, the one end of input coil L is connected live wire terminal a, the other end is connected zero line terminal B; the first output end C is connected to an input coil L, one end of the input coil L, which is connected with the zero line wiring end B, is defined as a negative input end, and the second output end D is connected with the negative input end. The utility model discloses the extreme point sign that marks in figure 1 is only for conveniently explaining the position, and in fact, the utility model discloses a live wire wiring end and zero line wiring end are only for distinguishing two extreme points and the name of defining, and zero line wiring end also can be connected to the live wire wiring end in practical application.

The utility model discloses in, make primary coil and secondary coil around establishing on same iron core by same root input coil L, though primary coil and secondary coil are formed by same root line winding, but two end of coil have inserted the commercial power jointly, and the centre is taken a percentage and a tip just also has formed secondary coil as the output in other words. And because the primary coil and the secondary coil are wound by the same copper wire, the situation that the transformer is burnt out due to the fact that zero-live wires are connected reversely does not occur. For the whole input coil L, two ends of the input coil L are respectively connected with a zero-live wire and used as a primary coil to be electrified, a first output end is connected to the input coil L (namely, between the two ends of the input coil), and the input coil L is connected between the point of the first output end and a negative input end and used as a secondary coil.

When the primary coil is energized, an alternating magnetic flux is generated in the iron core, and the alternating magnetic flux passes through the secondary coil, so that an alternating potential is generated in the secondary coil according to the electromagnetic induction law, and the voltage of the secondary side is unequal due to unequal turns of the primary side coil and the secondary side coil. For example, the input voltage shown in fig. 1 is 220V, the required output voltage is 110V, and assuming that the number of turns of the input coil L is 3500 turns, the primary coil has 3500 turns, and the secondary coil has 110V multiplied by 3500 turns divided by 220V, that is, 1750 turns.

In order to protect the circuit better, a recoverable fuse F is connected in series between the input coil L and the live wire terminal A or the zero wire terminal B. The resettable fuse F is a normally closed resettable fuse. The recoverable fuse F is used as a protection device, for example, when the current transformer is 10W, when a consumer uses the transformer with a load 11W or 12W, 13W and the like, and then the power is too large to cause too large current, the normally closed recoverable fuse in series can be tripped open, and the normally closed recoverable fuse can automatically recover after the excessive load is removed for about 30 minutes to 1 hour, so that the service life of the transformer is prolonged, and the transformer can be prevented from being damaged by misoperation of the consumer.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. The transformer wiring circuit is characterized by comprising a live wire terminal, a zero wire terminal, an input coil, a first output end, a second output end, a primary coil and a secondary coil, wherein the input coil is wound on an iron core; one end of the input coil is connected with the live wire terminal, and the other end of the input coil is connected with the zero line terminal; the first output end is connected to an input coil, one end of the input coil, which is connected with the zero line wiring end, is defined as a negative input end, and the second output end is connected with the negative input end.

2. The transformer wiring circuit of claim 1, wherein a recoverable fuse is connected in series between the input coil and the line or neutral terminal.

3. The transformer wiring circuit of claim 2, wherein the recoverable fuse is a normally closed recoverable fuse.