KR101903439B1 - A FAULT LOCATION ESTIMATION APPARATUS AND METHOD OF NEUTRAL LINE DRAW OUT TYPE MAIN TRANSFORMER AND UNBALANCED AUTOTRANSFORMER IN AC 2×25kV FEEDING SYSTEM - Google Patents

Abstract

The present invention relates to an apparatus and a method for expressing the advantages of a neutral line draw type main transformer and an unbalanced single phase transformer of an AC 2 x 25 kV power supply system.
The present invention includes an auxiliary device installed in a subdivision of a line and a subdivision subdivision, and a master value installed in a substation. When a failure occurs due to a short circuit or a ground fault between the line and the subdivision line, And provides the neutral point current information and the impedance information of the autotransformer to the host, and the host computes the accident occurrence interval and the high advantage in the accident occurrence interval using the neutral point current information and the impedance information.
According to the present invention, it is possible to provide a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an AC 2 × 25 kV power supply system that can supplement the existing circuit analysis method using the wire-wound current and line impedance to make more efficient, A high-strength facial expression apparatus and method are provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a neutral point extraction type main transformer and an unbalanced single phase transformer of an AC 2 × 25 kV power supply apparatus,

The present invention relates to an apparatus and a method for expressing the advantages of a neutral line draw type main transformer and an unbalanced single phase transformer of an AC 2 x 25 kV power supply apparatus. More specifically, the present invention relates to a neutral-wire-drawing main transformer and an unbalanced single-phase transformer of an AC 2 × 25 kV power supply system, which can complement the existing circuit analysis method using the excitation current and line impedance to make more efficient, And more particularly, to an apparatus and method for high-strength expression of a transformer.

The AC feed system uses a direct feed system, a suction transformer feed system, or an autotransformer feed system. In Korea, a 2 × 25 kV feed system using a single autotransformer is used as a standard feed system. The power supply system using an autotransformer receives the output of the main transformer of 55kV and transfers the power equivalent to 27.5kV to the vehicle by using a 1: 1 autotransformer. It compensates the voltage drop of the line and reduces the ground induced current It has excellent advantages.

Railway substation The main transformer is mainly used in Japan and in Korea by connecting the neutral point ground to the rail in the monotone transformer. In other countries, the neutral transformer is used to draw the neutral line and the substation does not have an autotransformer installed. The main transformer with no neutral point in the substation has a voltage of 55kV at the secondary side, whereas the main transformer with neutral point does not require the installation of the autotransformer, and a voltage of 25kV is formed between the main transformer and the autotransformer. And it has a great effect on reduction of construction cost.

The high-strength facial expression system is mainly used as a relay which informs the operator of the position of the accident in the event of a line accident, which is an important relay for helping to recover the accident, using a circuit calculation formula using reactance, idle current ratio and idle current.

The reactance method is mainly used in a direct feed method or in a feed-through transformer feed method, but in Europe, it is also used in a single-phase transformer method. However, in the case of the monolithic transformer system, the impedance curve is a parabola, which can give a maximum of three positions near the monolithic transformer.

Although the method of estimating the fault location using the ground current difference between the faulty autotransformers is simple, there is a possibility that the fault location estimation error may occur depending on the set value.

The feeding system circuit calculation method using the wicking current is a method of deriving the formula for the failure position by the wicking current measured by the voltage equation, the magnetic, mutual impedance of the line, and the impedance of the autotransformer. It is a high way.

Recently, in Korea, the main transformer which does not have a neutral line has been upgraded to a main transformer which takes out a neutral line. After the improvement, an autonomous transformer is installed in the substation and there is a movement not to install an autotransformer in the substation in the future.

Also, instead of installing an additional voltage compensating device to compensate for the voltage drop due to the vehicle load on the feeder line, a 1: N variable tapping autotransformer can be used instead of a 1: 1 autotransformer. The reason for this is that a voltage stabilizing device using a mechanical OLTC (load tap control) is installed due to voltage instability due to an increase in the generation of new and renewable energy in a distribution line, and a tendency to change from a mechanical type to an electronic type, It has become possible to put it to practical use.

Therefore, there is a need for a high-performance facial expression technology that can cope with such changes in the situation of the AC feed system, thereby enabling more efficient, precise, and low-cost construction.

Korean Registered Patent No. 10-1653954 (Registered Date: Aug. 30, 2016, Name: High-strength facial expression system using electric current of line and feeder line and method thereof in AC power railway monotone transformer feeding system)

The present invention relates to a high-strength expression of a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an alternating current 2 × 25 kV power supply system which can complement the existing circuit analysis method using the excitation current and line impedance, And an object of the present invention is to provide an apparatus and a method.

In order to solve such a technical problem, the present invention is a high-strength expression device of a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an AC 2 x 25 kV power supply system and installed in a main power supply line and auxiliary power supply line Wherein the auxiliary device provides the neutral point current information and the impedance information of the autotransformer provided in the line to the host, when the auxiliary device includes a failure due to a short circuit between the line and the electric line, Current information and the impedance information are used to calculate the high-level advantage in the accident occurrence period and the accident occurrence period.

The high-merit expression device of the neutral line draw type main transformer and the unbalanced single phase transformer of the AC 2 x 25 kV power supply system according to the present invention is characterized in that the high value is calculated using the following equation (9).

[Equation 9]

), Ib는 AT₃ 유입전류 (=

), Z_AT2T는 전차선측 AT₂ 단권변압기 임피던스, Z_AT2F는 급전선측 AT₂ 단권변압기 임피던스, Z_AT3T는 전차선측 AT₃ 단권변압기 임피던스, Z_AT3F는 급전선측 AT₃ 단권변압기 임피던스이다.In the above Formula 9, m is the distance to and benefits from the AT _2, l is the distance between the AT ₂ to AT _3, Z _C is a catenary (Catenary) magnetic impedance, Z _R the track (Rail) magnetic impedance, Z _F is transmission line magnetic impedance, Z _CR is catenary-rail cross-impedance, Z is _CF catenary-feed line cross-impedance, Z is a _RF line-feed line cross-impedance, Ia is AT ₂ inrush current (=

), Ib is the AT ₃ inrush current (=

), Z is _AT2T catenary side AT ₂ autotransformer impedance, Z _AT2F the feed line-side impedance autotransformer AT _2, Z is _AT3T catenary side AT ₃ autotransformer impedance, Z is a power supply line side _AT3F AT ₃ autotransformer impedance.

The present invention relates to a neutral point drawing type main transformer and an unbalanced type autotransformer of an AC 2 x 25 kV power supply system, in which a short-circuit fault occurs between the line and the electric line without an autotransformer installed in the substation In this case, the host value is calculated by using the following equation (10).

[Equation 10]

In the equation (10), Ia is the main transformer neutral current (= 2I ₀ ), Ib is the AT ₁ input current (= 2I ₁ + 2I ₂ + 2I ₃ + 2I ₄ ), Z _AT1T is the impedance of the AT _1- Z _AT1F is the impedance of the AT _{1- stage} transformer on the feeder side.

In the apparatus for high-strength expression of a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an AC 2 x 25 kV power supply system according to the present invention, a master value installed in the substation is installed in the feeding classifier and the auxiliary feeding classifier The auxiliary device transmits the neutral point current information of the autotransformer and the impedance information of the autotransformer, which are intrinsic input values, measured in the feed distinction section and the auxiliary feed distinction section, And the main value is calculated by using the neutral point current information and the impedance information to calculate an accident occurrence period and a high advantage in the accident occurrence period.

In the high-powered expression device of the neutral line drawing type main transformer and the unbalanced single-phase transformer of the AC 2 * 25 kV feeding system according to the present invention, the feeding class, the auxiliary feeding class and the substation are connected by the optical cable to communicate .

The high-strength expression method of the neutral-wire drawing type main transformer and the unbalanced single-phase transformer of the AC 2 x 25 kV power supply system according to the present invention is a step of determining whether the master value installed in the substation is a failure that recognizes a failure due to a short- A failure information notification step of notifying a fault to the auxiliary device installed in the power supply line and the auxiliary power supply line of the line, the auxiliary device providing the neutral point current information and the impedance information of the monolithic transformer provided in the line to the master Information providing step and a high-cost calculating step of calculating the high-level advantage in the accident occurrence period and the accident occurrence period by using the neutral point current information and the impedance information.

In a high-strength expression method of a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an AC 2 x 25 kV power supply system according to the present invention, in the high-grade calculation step, the master value is calculated by using Equation (9) .

[Equation 9]

), Ib는 AT₃ 유입전류 (=

), Z_AT2T는 전차선측 AT₂ 단권변압기 임피던스, Z_AT2F는 급전선측 AT₂ 단권변압기 임피던스, Z_AT3T는 전차선측 AT₃ 단권변압기 임피던스, Z_AT3F는 급전선측 AT₃ 단권변압기 임피던스이다.In the above Formula 9, m is the distance to and benefits from the AT _2, l is the distance between the AT ₂ and AT _3, Z _C is a catenary (Catenary) magnetic impedance, Z _R is track (Rail) magnetic impedance, Z _F is transmission line magnetic impedance, Z _CR is catenary-rail cross-impedance, Z is _CF catenary-feed line cross-impedance, Z is a _RF line-feed line cross-impedance, Ia is AT ₂ sink current (=

), Ib is the AT ₃ inrush current (=

), Z is _AT2T catenary side AT ₂ autotransformer impedance, Z _AT2F the feed line-side impedance autotransformer AT _2, Z is _AT3T catenary side AT ₃ autotransformer impedance, Z is a power supply line side _AT3F AT ₃ autotransformer impedance.

In the high-strength expression method of the neutral-wire drawing type main transformer and the unbalanced single-phase transformer of the AC 2 x 25 kV power supply system according to the present invention, in a state where the autotransformer is not installed in the substation, In the high-score calculation step, the high-score calculation unit calculates the high score using Equation (10).

[Equation 10]

In the equation (10), Ia is the main transformer neutral current (= 2I ₀ ), Ib is the AT ₁ inrush current (= 2I ₁ + 2I ₂ + 2I ₃ + 2I ₄ ), Z _AT1T is the impedance of the AT _1- Z _AT1F is the impedance of the AT _{1- stage} transformer on the feeder side.

In the high-strength expression method of the neutral-wire drawing type main transformer and the unbalanced single-phase transformer of the AC 2 x 25 kV feeding system according to the present invention, the feeding class, the auxiliary feeding class and the substation are connected by optical cables to communicate .

In the present invention, the neutral point current information of the autotransformer is obtained by multiplying the measured values of the feeding distinction and the auxiliary feeding distinction factor And the impedance information of the line and the autotransformer is a unique input value.

According to the present invention, it is possible to provide a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an AC 2 × 25 kV power supply system that can supplement the existing circuit analysis method using the wire-wound current and line impedance to make more efficient, There is an effect that a high-strength facial expression apparatus and method are provided.

FIG. 1 is a circuit diagram for explaining a conventional method of expressing a merit when a short circuit fault occurs between a line and a line of an AC power supply system, and FIG.
FIG. 2 is a block diagram of an apparatus and method for expressing the advantages of a neutral line drawing type main transformer and an unbalanced single step transformer in an AC 2 × 25 kV power supply system according to an embodiment of the present invention. Fig. 2 is a circuit diagram for explaining the principle of the present invention,
3 is a view showing a high-strength facial expression system of a neutral line draw type main transformer and an unbalanced single phase transformer of an AC 2 x 25 kV power supply system according to an embodiment of the present invention,
FIG. 4 is a diagram illustrating a high-strength expression method of a neutral line draw type main transformer and an unbalanced single phase transformer of an AC 2 × 25 kV power supply system according to an embodiment of the present invention.

It is to be understood that the specific structural or functional description of embodiments of the present invention disclosed herein is for illustrative purposes only and is not intended to limit the scope of the inventive concept But may be embodied in many different forms and is not limited to the embodiments set forth herein.

The embodiments according to the concept of the present invention can make various changes and can take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element may be referred to as a second element, The component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that no other element exists in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like are used to specify that there are features, numbers, steps, operations, elements, parts or combinations thereof described herein, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

The present invention complements the conventional circuit analysis method using the excitation current and the line impedance, and proposes a new high-strength expression device and method corresponding to a single-winding transformer using a neutral line drawing type main transformer and a variable tap.

FIG. 1 is a circuit diagram for explaining a conventional method of expressing a merit when a short circuit fault occurs between a line and a line of an AC power supply system.

Referring to FIG. 1, there is illustrated a situation where a short circuit between a catenary line and a line occurs in a section between AT ₂ and AT ₃ .

Each autotransformer is represented by an independent voltage power source. The voltage equations for the currents flowing through the respective loops are summarized as the following equations (1) to (4).

Equation 1 below is the voltage equation for the loop 1.

[Equation 1]

Equation 2 below is the voltage equation for the loop ②.

[Equation 2]

Equation 3 below is the voltage equation for loop ③.

[Equation 3]

Equation 4 below is the voltage equation for the loop ④.

[Equation 4]

The voltage equations of Equations 1 to 4 are summarized as follows.

Equation 5 below is the difference between Equation 1 and Equation 2 and corresponds to the difference between the loop 1 and the loop 2.

[Equation 5]

Equation 6 below is the difference between Equation 4 and Equation 3 and corresponds to the difference between the loop ④ and the loop ③.

[Equation 6]

Since the ideal 1: 1 single-phase transformer (AT) is used, the primary and secondary voltages of the transformer are the same. Therefore, Equation 5 and Equation 6 can be summarized as Equation 7 for the failure distance m.

[Equation 7]

In Equation 1 to Equation 7, m is the distance from AT ₂ to the high point, l is the distance between AT ₂ and AT ₃ , Z _C is the catenary magnetic impedance, Z _R is the rail magnetic impedance, Z _F is the feed line magnetic impedance, Z _CR: catenary-rail cross-impedance, Z _CF is catenary-feed line cross-impedance, Z _RF is the line-feed line cross-impedance, Ia is AT ₂ sink current _{(= 2I 1 + 2I 2)} , Ib is AT ₃ inrush current (= 2I ₃ + 2I ₄ ).

Referring to equation (7), the impedance of the line and the autotransformer is the unique input value and the current of the autotransformer is the measured value.

In other words, 1), AT ₂ sink current (= 2I ₁ + 2I ₂₎ of Ia and AT ₃ of Ib-rush current (= 2I ₃ + 2I ₄₎ shall be derived from the measured values at each autotransformer, 2) the ideal Z _AT2 and Z _AT3 are the same as 1: 1 single phase transformer (AT).

FIG. 2 is a block diagram of an apparatus and method for expressing the advantages of a neutral line drawing type main transformer and an unbalanced single step transformer in an AC 2 × 25 kV power supply system according to an embodiment of the present invention. In a circuit diagram.

2, the Zs of the main transformer, Z _AT1 , .... Z _AT4 of the catenary T and the feeder F are different. In this case, Equation 7 Transformer of Zs and catenary (T) and the feed line (F) side of each of the Z _AT1, ... in, because the Z _AT4 is changed, Equation 7 can be changed as shown in the following formula 8.

[Equation 8]

In Formula 8, Ia is AT ₂ sink current _{(= 2I 0 + 2I 1 +} 2I 2), Ib is a AT _3-rush current _{(= 2I 3 + 2I 4)} , Z AT2T the catenary side AT ₂ autotransformer impedance, Z _AT2F the power supply line side impedance autotransformer AT _2, Z is _AT3T catenary side AT ₃ autotransformer impedance, Z is a catenary side _AT3F AT ₃ autotransformer impedance.

(9) is obtained by generalizing Eq. (8) and deriving a fault distance equation when a short circuit fault occurs between AT (n) and AT (n + 1) and n = 1..3.

[Equation 9]

), Ib는 AT₃ 유입전류(=

), Z_AT2T는 전차선측 AT₂ 단권변압기 임피던스, Z_AT2F는 급전선측 AT₂ 단권변압기 임피던스, Z_AT3T는 전차선측 AT₃ 단권변압기 임피던스, Z_AT3F는 급전선측 AT₃ 단권변압기 임피던스이다.In Equation 9, Ia is the AT ₂ inrush current (=

), Ib is the AT ₃ inrush current (=

), Z is _AT2T catenary side AT ₂ autotransformer impedance, Z _AT2F the feed line-side impedance autotransformer AT _2, Z is _AT3T catenary side AT ₃ autotransformer impedance, Z is a power supply line side _AT3F AT ₃ autotransformer impedance.

In the case where a single-pole transformer is not installed in a substation in the same manner, a fault distance formula for a case where a short-circuit between a main transformer and a single-phase transformer occurs, can be expressed as shown in Equation 10 below.

[Equation 10]

In Equation 10, Ia is the main transformer neutral current (= 2I ₀ ), Ib is the AT ₁ inrush current (= 2I ₁ + 2I ₂ + 2I ₃ + 2I ₄ ), Z _AT1T is the impedance of the AT _{1- AT1F} is the impedance of the AT _{1- stage} transformer on the feeder side.

FIG. 3 is a diagram showing a high-strength expression system of a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an AC 2 × 25 kV power supply system according to an embodiment of the present invention.

Referring to FIGS. 2 and 3, the high-strength facial expression device of the neutral-wire drawing type main transformer and the unbalanced single-phase transformer of the AC 2 * 25 kV feeding system according to the embodiment of the present invention includes a main body 10 installed in a substation, (20, 30, 40, 50) installed in the auxiliary and auxiliary power supply lines and in case of a failure due to a short circuit between the line and the electric cable, the auxiliary devices (20, 30, 40, 50) The neutral point current information and the impedance information of the provided autotransformer are provided to the main unit 10. The main unit 10 uses the neutral point current information and the impedance information to calculate the fault occurrence period and the high fault in the fault occurrence period.

For example, the master device 10 installed in the substation can be configured to calculate the high advantage by using Equation 9 described above.

Further, for example, when a short-circuit accident occurs between the line and the electric cable in the state where the single-phase transformer is not installed in the substation, the master device 10 installed in the substation is configured to calculate the high advantage by using Equation (10) .

As an example related to the system operation for high-performance calculation, when the master device 10 installed in the substation recognizes a failure, the auxiliary device 20, 30, 40, 50 installed in the feeding distinction and the auxiliary feeding distinction, The auxiliary devices 20, 30, 40 and 50 supply the neutral point current information of the single phase transformer measured at the feeding distances and the auxiliary feeding distances and the impedance information of the line and the single point transformer, And the host device 10 can be configured to calculate a high advantage in an accident occurrence interval and an accident occurrence interval by using the neutral point current information and the impedance information.

For example, the feeder class and the auxiliary feeder class and the substation can be configured to be connected and communicated by optical cables.

FIG. 4 is a diagram illustrating a high-strength expression method of a neutral line draw type main transformer and an unbalanced single phase transformer of an AC 2 × 25 kV power supply system according to an embodiment of the present invention.

Referring to FIG. 2 and FIG. 4, the high-strength expression method of the neutral-wire drawing type main transformer and the unbalanced single-phase transformer of the AC 2 x 25 kV power supply system according to an embodiment of the present invention includes step S10, Step S20, information providing step S30, and high-benefit computing step S40.

In the step S10, whether or not the main unit 10 installed in the substation detects a failure due to a short circuit between the line and the electric line is performed.

In the failure notification step S20, a process is performed in which the master device 10 notifies the failure to the auxiliary devices 20, 30, 40, and 50 provided in the feed distinction section and the auxiliary feed distinction section of the track.

In the information providing step S30, a process of providing the neutral point current information and the impedance information of the monolithic transformer provided in the line to the auxiliary device 20, 30, 40, 50 is performed.

In the high-performance calculation step S40, the main controller 10 calculates the high-level advantage in the accident occurrence interval and the accident occurrence interval using the neutral point current information and the impedance information.

For example, in the high-performance computing step S40, the host computer 10 can be configured to compute the high-performance computing using Equation 9 described above.

For example, when a short-circuit fault occurs between the line and the electric cable without the single-phase transformer installed in the substation, in the high-cost calculation step S40, the main controller 10 calculates the high- . ≪ / RTI >

For example, the feeder class and the auxiliary feeder class and the substation can be configured to be connected and communicated by optical cables.

For example, the neutral current information of the autotransformer is the information measured at the feed distinction and the auxiliary feed distinction, and the impedance information of the line and the autotransformer may be a unique input value.

As described in detail above, according to the present invention, it is possible to compensate the existing circuit analysis method using the pick-up current and the line impedance to make a more efficient and precise construction cost reduction. There is an effect that a high-strength expression device and method of a transformer and an unbalanced single-phase transformer are provided.

10: Hostess
20, 30, 40, 50: auxiliary device
Step S10:
S20: Failure notification step
S30: information providing step
S40: Advantage calculation step

Claims (10)

As a high-performance facial expression system of a neutral-wire drawing type main transformer and an unbalanced single-phase transformer of an AC 2 × 25 kV feeding system,
A master installed in a substation; And
It includes auxiliary equipment installed in the feeder class and auxiliary feeder class of the track,
When a fault occurs due to a short circuit between the line and the electric line,
Wherein the auxiliary device provides the neutral point current information and the impedance information of the autotransformer provided in the line to the master,
Wherein the main value is calculated by using the neutral point current information and the impedance information to calculate an accident occurrence period and a high advantage in the accident occurrence period,
When the main unit installed in the substation recognizes a failure and notifies the auxiliary unit installed in the feeding distinction unit and the auxiliary feeding distinction unit of the failure,
Wherein the auxiliary device provides neutral point current information of the autotransformer and the impedance information of the line and the autotransformer, which are intrinsic input values, measured in the feeding distinction and the auxiliary feeding distinction,
Wherein the main value computes an accident occurrence period and a high advantage in the accident occurrence period by using the neutral point current information and the impedance information. High-strength facial expression device.
The method according to claim 1,
[0034]
Wherein the high advantage is computed using Equation (9). ≪ Desc / Clms Page number 20 >
[Equation 9]

In the above Formula 9, m is the distance to and benefits from the AT _2, l is the distance between the AT ₂ and AT _3, Z _C is a catenary (Catenary) magnetic impedance, Z _R is track (Rail) magnetic impedance, Z _F is transmission line magnetic impedance, Z _CR is catenary-rail cross-impedance, Z is _CF catenary-feed line cross-impedance, Z is a _RF line-feed line cross-impedance, Ia is AT ₂ sink current (=

), Ib is the AT ₃ inrush current (=

), Z is _AT2T catenary side AT ₂ autotransformer impedance, Z _AT2F the feed line-side impedance autotransformer AT _2, Z is _AT3T catenary side AT ₃ autotransformer impedance, Z is a power supply line side _AT3F AT ₃ autotransformer impedance.
The method according to claim 1,
When a short-circuit fault occurs between the line and the electric line without a single-phase transformer installed in the substation,
[0034]
Wherein the high advantage is computed using Equation (10). ≪ RTI ID = 0.0 > [10] < / RTI >
[Equation 10]

In the equation (10), Ia is the main transformer neutral current (= 2I ₀ ), Ib is the AT ₁ inrush current (= 2I ₁ + 2I ₂ + 2I ₃ + 2I ₄ ), Z _AT1T is the impedance of the AT _1- Z _AT1F is the impedance of the AT _{1- stage} transformer on the feeder side.
delete The method according to claim 1,
Characterized in that the feeding section, the auxiliary feeding section, and the substation are connected by an optical cable and communicate.
As a high-strength expression method of a neutral-wire-drawing main transformer and an unbalanced monolithic transformer of an AC 2 × 25 kV power supply system,
Whether the main unit installed in the substation is a fault that recognizes a fault due to a short circuit between the line and the electric line;
A failure notification step in which the master device notifies the failure to an auxiliary device installed in the power supply line and the auxiliary power supply line of the line;
The auxiliary device providing neutral point current information and impedance information of the monolithic transformer provided in the line to the host; And
And a high-gain computing step of computing the high-level advantage in the accident occurrence period and the accident occurrence interval using the neutral point current information and the impedance information,
Wherein the neutral point current information of the autotransformer is information measured in the feeding distinction and the auxiliary feeding distinction and the impedance information of the line and the autotransformer is a unique input value. High - strength expression method of neutral - wire drawing main transformer and unbalanced single - phase transformer.
The method according to claim 6,
In the high-score computing step,
[0034]
And calculating the high advantage by using Equation (9). The high-strength expression method of the neutral line draw type main transformer and the unbalanced single phase transformer of the AC 2 x 25 kV power supply system.
[Equation 9]

, M is the distance from the AT ₂ to the high point, l is the distance between AT ₂ and AT ₃ , Z _C is the catenary magnetic impedance, Z _R is the rail magnetic impedance, Z _F the feed line magnetic impedance, Z _CR is catenary-rail cross-impedance, Z is _CF catenary-feed line cross-impedance, Z is a _RF line-feed line cross-impedance, Ia is AT ₂ sink current (=

), Ib is the AT ₃ inrush current (=

), Z is _AT2T catenary side AT ₂ autotransformer impedance, Z _AT2F the feed line-side impedance autotransformer AT _2, Z is _AT3T catenary side AT ₃ autotransformer impedance, Z is a power supply line side _AT3F AT ₃ autotransformer impedance.
The method according to claim 6,
When a short-circuit fault occurs between the line and the electric line without a single-phase transformer installed in the substation,
In the high-score computing step,
[0034]
Wherein the high advantage is computed using Equation (10). ≪ RTI ID = 0.0 > 11. < / RTI >
[Equation 10]

In the equation (10), Ia is the main transformer neutral current (= 2I ₀ ), Ib is the AT ₁ inrush current (= 2I ₁ + 2I ₂ + 2I ₃ + 2I ₄ ), Z _AT1T is the impedance of the AT _1- Z _AT1F is the impedance of the AT _{1- stage} transformer on the feeder side.
The method according to claim 6,
Wherein the feeder classifier, the auxiliary feeder classifier, and the substation are connected by an optical cable to communicate. 2. The method of claim 1, wherein the feeder classifier is connected to the substation by an optical cable.
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