KR20000008129U - Instrument Current Transformer Structure of Electronic Motor Relay - Google Patents

Abstract

The present invention relates to an instrument current transformer (CT) structure of an electronic motor protection relay, which is separated into a first core part (part A) and a second core part (part B), and stacked as many cores as necessary. To obtain the induced electromotive force, coil (C part) is wound around one of the first core part (part A) or the second core part (part B) and connected to the circuit, and the separated counterpart is inserted into the current transformer case (part D) for the instrument. In addition, it is characterized in that the case (F part) is formed in a form corresponding to the core part so that the motor protection relay body (E part) can be easily separated and combined, so that a closed circuit can be configured at the time of coupling.

Description

Instrument Current Transformer Structure of Electronic Motor Relay

The present invention relates to a current transformer (CT) structure of an electronic motor protection relay, and in particular, to provide a convenience for the installation of the motor protection relay, and to ensure the reliability of the product, time and The present invention relates to a current transformer structure for an instrument of an electronic motor protection relay, which enables cost reduction.

In general, the electronic motor protection relay is a product having a function to more accurately protect the AC motor by detecting the overcurrent, phase loss, phase imbalance, and reverse phase which occurs during the start-up and operation of the AC motor. The configuration is divided into an operation circuit section, an output circuit section and a control circuit section.

When power is supplied to the input terminal of the operation circuit part, the current converted through the current transformer for the meter in each phase (U, V, W) flows into the control circuit part and compares the amplified value. By opening the contact (b contact), power supply to the operation coil part of the AC electromagnetic contactor supplied through the closed contact is interrupted to cut off the power supply source supplied to the AC motor, thereby preventing the motor from being burned out and protecting it.

Therefore, with the development of the modern business, the use of electric equipment increases exponentially, and the need for an electronic motor protection relay requiring high reliability increases in parallel, thereby greatly improving convenience. It is effective to satisfy the needs of consumers to the maximum.

On the other hand, conventionally, as shown in FIG. 1, the annular core (part A) is stacked as many times as necessary to obtain an induction electromotive force, in which a coil is wound around the core and connected to a circuit, and a load side (part C) input power wire is installed inside the current transformer assembly for the instrument. It is used as a penetrating structure.

That is, by supplying the control power (E part) to the operation circuit portion and the load side (C part) input power through the current transformer assembly for the instrument as shown in Figure 1 by comparing the converted current flowed into the control circuit and amplified value, In case of abnormality during start-up and operation of AC motor, it operates relay of output circuit and cuts off the operation coil power of AC magnetic contactor supplied through closed contact, and prevents damage and protection of AC motor by opening main circuit of magnetic contactor. Done.

Conventionally, as shown in FIG. 1, the shape of the assembly is annular (closed circuit). When the current transformer assembly is assembled inside the motor protection relay when the load side (C part) input power cable is assembled, the terminal is formed to the outside of the motor protection relay. It is used in the form of connecting AC motor and input load by using the terminal after drawing out and exposing the instrument current transformer assembly to the outside of the motor protection relay to use the wire directly between the current transformer assembly annular without using the terminal. Use two methods of form.

However, this has the following drawbacks.

In other words, if the current transformer assembly for the instrument is inside, wires and external terminals necessary for drawing out to the outside of the motor protection relay are required, and terminal forming work necessary for connection between AC motor and input load is necessary. It has the drawback of wasting a lot of time and money more than necessary.

In addition, when the current transformer assembly is external, it is not necessary to form the lead line and the terminal from the motor protection relay, but it is necessary for the product characteristics due to the influence of external exposure of the current transformer assembly (Noise; radio, etc.). The product does not have the characteristics of the product to be obtained due to the fluctuation of the fine output value, and thus there is a defect that the reliability of the AC motor is not guaranteed and the reliability is not guaranteed due to the malfunction of the product.

The present invention is to solve the above problems, the structure that can be separated (open circuit) in the shape annular (closed circuit) of the current transformer for the instrument, simplifying the structure to provide product reliability and convenience in installation construction For the purpose of

As a means for achieving the above object,

The present invention separates the first core portion and the second core portion, and stacks the cores as many times as necessary, and coils are wound around one of the first core portion or the second core portion to obtain an induced electromotive force, and connected to the circuit. Inserted into the current transformer case for the instrument, it is characterized in that the case is formed in a form corresponding to the core portion to facilitate the separation and coupling with the motor protection relay body to form a closed circuit when combined.

1 is a current transformer structure for the instrument of a general electronic motor protection relay.

Figure 2 is a current transformer structure for the instrument of the electronic motor protection relay of the present invention.

<Explanation of symbols for main parts of the drawings>

Part A: First Core

Part B: Second Core

Part C: Coil

Part D: Case for Instrument Current Transformer

Part E: motor protection relay body

Part F: Case for Instrument Current Transformer

Part G: control power

H part: Load side

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic view of the present invention, wherein the core is separated into a first core part (part A) and a second core part (part B) and stacked as many cores as necessary, and the first core part (part A) is obtained to obtain induced electromotive force. ) Or the coil (C part) is wound around one of the second core parts (part B) and connected to the circuit, and the separated counterpart is inserted into the current transformer case (part D) and separated from the motor protection relay body (part E). The case (F part) is formed in a shape corresponding to the core part so that the coupling is easy, so that the closed circuit can be configured at the time of coupling.

Then, as shown in FIG. 2, the control power supply (G part) is supplied to the operation circuit unit, and the load side (H part) input power wire is passed between the current transformer assemblies for the instrument to compare the converted current with the amplified value. Therefore, when abnormality occurs during start-up and operation of the AC motor, the relay of the output circuit is driven to cut off the operation coil power of the AC contactor supplied through the closed contact, and the main circuit of the electromagnetic contactor is opened to prevent and protect the AC motor from burning out. Will be performed.

On the other hand, the instrument current transformer core (part D) is a structure that can be separated by replacing the shape of the "c" or "b" form, using a bobbin (Bobbin) without detecting the coil directly to the instrument current transformer core It is intended to have a structure of some substituted form for inserting the coil assembly.

The present invention configured as described above is a structure capable of separating (open circuit) the current transformer assembly shape annular (closed circuit), which is a problem of the prior art, by separating the first core portion and the second core portion required a nose In order to obtain the induced electromotive force, the coil is wound around one of the first core or the second core and connected to the circuit, and the separated counterpart is inserted into the current transformer case for the instrument to facilitate separation and coupling with the motor protection relay body. It can be installed in the position between the motor protection relay and the alternating current contactor. No wires or external terminals required for drawing out are required, and terminals required for connection between AC motor and input load. No forming work is required.

In addition, when the current transformer assembly is external, the same effect as the installation method exposed even when the current transformer is inside is not affected by external exposure of the current transformer current (noise: radio, other electromagnetic waves, etc.). By solving the prior art problems can be solved.

As described above, the present invention is a structure that can be separated (open circuit) from the shape annular (closed circuit) of the current transformer for the instrument, and provides an effect of simplifying the structure to provide product reliability and convenience in installation construction.

Claims (2)

Separate the first core part (part A) and the second core part (part B) to stack as many cores as necessary, and obtain the first core part (part A) or the second core part (part B) to obtain induced electromotive force. The coil (C part) is wound around one of the coils and connected to the circuit, and the separated counterpart is inserted into the current transformer case (part D) of the instrument, and corresponding to the core part for easy separation and coupling with the motor protection relay body (part E). Current transformer structure for an electronic motor relay, characterized in that to form a furnace case (part F) to form a closed circuit when combined. The method of claim 1, The instrument current transformer core (part D) is a structure that can be separated by replacing the shape of the "c" or "b" form, coil assembly using a bobbin (Bobbin) without detecting the coil directly to the instrument current transformer core Instrument current transformer structure of the electronic motor relay, characterized in that to have a structure of the part substituted.