KR20200056524A - System and method for checking state of metering out fit - Google Patents

Abstract

The present invention relates to a system and a method for checking a state of a meter transformer. According to an embodiment of the present invention, a system for checking the state of a meter transformer comprises: a faucet facility including an lead-in switchgear, the meter transformer connected to the lead-in switchgear to transform a special high voltage to a first low voltage and a high current to a low current, a watt-hour meter for measuring the power consumption of the meter transformer; a transformer for transforming the first low voltage of the meter transformer to a second low voltage, a plurality of loads operating at the second low voltage of the transformer, and a plurality of CT sensors provided between the transformer and the plurality of loads to measure the amount of current flowing into each of the loads; a remote metering device connected to the watt-hour meter to remotely check the power consumption of the meter transformer; and a state checking device for checking whether the meter transformer is broken by comparing the amount of power converted from the amount of current measured by the plurality of CT sensors with the power consumption of the meter transformer checked by the remote metering device. Therefore, the system and the method can prevent an accident by checking the state of the meter transformer in real time.

Description

System and method for checking the status of transformers for instruments {SYSTEM AND METHOD FOR CHECKING STATE OF METERING OUT FIT}

The present invention relates to a system and method for checking the condition of a transformer for an instrument.

The electricity rate is calculated by multiplying the electricity consumption measured by the watt-hour meter by the CT ratio and the PT ratio. In this process, the transformer ratio is constant, but the current ratio varies according to the standard, so the current ratio is incorrectly applied. Electricity charges are underestimated at the time, and electricity rates are also underestimated due to deterioration of functions or failure of the current transformer, so the current ratio and error range are key factors in fair trade. will be.

Electric utilities conduct periodic tests in the field to discover such unfair cases, and the method of implementation is primary transformers and transformers for instruments in the field by using live work vehicles or directly visiting customers as shown in FIGS. 1A to 1C. It employs a field-based method that is labor-dependent and consumes a large budget, such as verifying the current ratio by checking the secondary current and checking the error ratio of the current ratio.

The above-mentioned background art is technical information acquired by the inventor for the derivation of the present invention or acquired in the derivation process of the present invention, and is not necessarily a known technology disclosed to the general public prior to the filing of the present invention.

Domestic registered patent publication No. 10-1692316

The present invention has been devised to solve the above-mentioned problems and / or limitations, and an object of the present invention according to one aspect is to check the state of a transformer for an instrument in real time to check electricity in real time due to abnormal wiring, drainage errors, and forgery / modulation The goal is to prevent the miscalculation of, and to prevent safety accidents with prompt response measures.

Instrument transformer status check system according to an embodiment of the present invention is connected to the inlet switchgear to transform the special high voltage to the first low pressure and the transformer for the instrument to transform the high current to low current, the power consumption of the transformer for the instrument Power meter to measure, a transformer for transforming the first low voltage of the transformer for the instrument to a second low voltage, a plurality of loads operating at the second low voltage of the transformer, and provided between each of the transformer and the plurality of loads A receiving facility including a plurality of CT sensors that measure the amount of current flowing into each of the loads; A remote meter reading device connected to the watt-hour meter to remotely check the power consumption of the instrument transformer; And a state checking device that compares the amount of power converted from the amount of current measured by the plurality of CT sensors with the power consumption of the transformer for metering read by the remote metering device, and checks whether the metering transformer has failed. It can contain.

The condition checking device, the gateway for collecting the amount of current measured by the plurality of CT sensors; The first power amount difference value between the amount of power converted from the sum of the amount of current measured by the plurality of CT sensors collected from the gateway and the amount of power used by the meter transformer read by the remote meter reading device is stored in advance. A loss compensation unit applying a loss compensation value of the transformer; And a second amount between the amount of power converted by adding the loss compensation value of the transformer to the sum of the amount of current measured by the plurality of CT sensors collected from the gateway and the amount of power used by the transformer for meter reading by the remote meter reading device. It may include a; if the difference in the amount of power exceeds the reference error, the state check unit for determining that an abnormality has occurred in the transformer for the instrument.

The state check unit, when the second power difference value exceeds the reference error, the transformer of the transformer for transforming the special high voltage included in the instrument transformer to a first low voltage and the high current to a low current It can be determined that an abnormality has occurred in one or more of the denaturation ratios of the current transformer for the instrument.

The apparatus for checking the state may further include a synchronization unit that controls the plurality of CT sensors so that the time for measuring the amount of power consumption of the transformer for the instrument of the watt-hour meter follows the current measurement time of the plurality of CT sensors.

Method for checking the status of a transformer for an instrument according to an embodiment of the present invention is connected to a transformer for a meter connected to an inlet switch, a watt-hour meter for measuring the power consumption of the transformer for a meter, and a meter transformer The load measured by the plurality of CT sensors among the power receiving facilities including a transformer, a plurality of loads operating at the second low voltage of the transformer, and a plurality of CT sensors provided between the transformer and each of the plurality of loads. Collecting the amount of current flowing into each; Collecting, by the condition checking device, power consumption of the instrument transformer that is connected to the watt hour meter and that the remote meter reading device remotely reads; And comparing the amount of electric power converted from the amount of current measured by the plurality of CT sensors with the amount of electric power used by the instrument transformer, which is read by the remote metering device, to determine whether the instrument transformer has failed. Checking; may include.

The checking step corresponds to a first power amount difference value between the amount of power converted from the sum of the amount of current measured by the plurality of CT sensors and the amount of power used by the transformer for meter reading by the remote meter reading device. Applying a loss compensation value of the transformer; And a second amount between the amount of power converted by adding the loss compensation value of the transformer to the sum of the amount of current measured by the plurality of CT sensors collected from the gateway and the amount of power used by the transformer for meter reading by the remote meter reading device. And determining that an abnormality has occurred in the transformer for the instrument when the difference in power amount exceeds a reference error.

In the determining step, when the second electric power difference value exceeds a reference error, the transformation ratio and the high current of the transformer for the instrument for transforming the special high voltage included in the instrument transformer to a first low voltage It may include; determining that an abnormality has occurred in one or more of the denaturation ratio of the current transformer for the instrument to denature.

The method further comprises the steps of: controlling, by the condition checking device, the plurality of CT sensors such that the time of measurement of the amount of power used by the transformer for the instrument of the watt-hour meter follows the current measurement time of the plurality of CT sensors; can do.

In addition to this, other methods for implementing the present invention, other systems, and computer programs for executing the methods may be further provided.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

According to embodiments, it is possible to prevent an accident due to abnormal wiring, drainage and miscalculation, and incorrect calculation of electricity charges due to forgery / modulation of the transformer by checking the status of the transformer for the instrument in real time, and to prevent a safety accident by promptly responding.

In addition, it is possible to relieve the fatigue of direct-run tasks such as on-site technical guidance for customers who have difficulty in consignment service and when consignment service is in operation at the time of inspection such as late-night loads, agricultural rest, and distributed type.

In addition, it is possible to reduce consignment costs for periodic testing of instrument transformers and prevention of power failure equipment failure.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a view showing a transformer test for the instrument by the personnel dispatched to the site according to the prior art.
2 is a view for schematically explaining a transformer state inspection system for an instrument according to an embodiment of the present invention.
3 is a flowchart illustrating a method for checking the state of a transformer for an instrument according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments presented below, but may be implemented in various different forms, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. . The embodiments presented below are provided to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those skilled in the art to which the present invention pertains. In the description of the present invention, if it is determined that a detailed description of known technologies related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

Terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, and in describing with reference to the accompanying drawings, identical or corresponding components are assigned the same reference numbers, and redundant description thereof is omitted. I will do it.

2 is a view for schematically explaining a transformer state inspection system for an instrument according to an embodiment of the present invention. Referring to FIG. 2, the instrument transformer status checking system 1 may include a power receiving facility 100, a remote meter reading device 200 and a status checking device 300.

The power receiving facility 100 may refer to a collection of electrical equipment that converts high-voltage electricity received from a power company (for example, KEPCO) into low-voltage electricity suitable for operation of the load facility and supplies electricity to the load facility. According to the purpose, the facility for converting electricity received from a utility company to a high voltage to a low voltage may be referred to as a high voltage power receiving facility, and a facility for converting electricity received at a special high voltage to a low voltage may be referred to as a special high voltage receiving facility. .

Such a power receiving facility 100 includes an inlet switch 110, a metering out-fit (MOF, 120), a power meter 130, a transformer 140, a load 150, and a CT sensor 160 Can be.

The inlet switch 110 is disposed at the inlet of the special high voltage electricity supplied from the power company to open and close the special high voltage and high current.

The transformer 120 for the instrument is connected to the inlet switch 110 and is connected to the inlet switch 110 so that the user can receive the high voltage and the electricity supplier 130 to install electricity for calculating electricity bills. It can be a device that precisely supplies by modifying the low voltage and low current. The transformer for the instrument 120 may include a transformer for a transformer (PT, not shown) that transforms a special high voltage to a low pressure, and a transformer (CT, not shown) for transforming a high current into a low current. Can be.

The wattmeter 130 may measure the power consumption of the transformer 120 for the instrument, and the power consumption may be calculated by multiplying the current transformer ratio (CT ratio) and the transformer ratio (PT ratio).

The transformer 140 may be connected to the instrument transformer 120 to transform the low voltage denatured in the instrument transformer 120 into a low voltage for driving the load 150. If the low voltage modified by the transformer for the instrument 120 is called the first low voltage, the voltage output from the transformer 140 may be a second low voltage lower than the first low voltage, for example, 220V. In this embodiment, although the load 150 is illustrated as the first load 151 to the third load 153, the number of loads 150 may not be limited thereto.

The CT sensor 160 is provided between the output terminal of the transformer 140 and the input terminal of the load 150 to measure the amount of current flowing into the load 150. Here, the CT sensor 160 can measure the pulse amount of the incoming current, and can measure the power amount later with the pulse amount of the current. In this embodiment, the number of loads 150 and the number of CT sensors 160 may be the same. That is, although the CT sensor 160 is illustrated as the first CT sensor 161 to the third CT sensor 163 in this embodiment, the number of the CT sensors 160 may be a plurality, without being limited thereto.

The remote meter reading device 200 remotely reads and stores the power usage of the transformer 120 for the instrument measured by the electricity meter 130 in a preset time unit, and can calculate charge information according to the power usage. The remote meter reading device 200 may be connected to a data concentration device (not shown) that collects meter reading data through a common communication network (eg, CDMA, Wibro, HFC, etc.).

The condition checking device 300 compares the sum of the amount of current measured by the plurality of CT sensors 160 and the power consumption of the transformer 120 for the meter meter read by the remote meter 200 through the wattmeter 130, It is possible to check whether the instrument transformer 120 has failed. The state checking device 300 may include a gateway 310, a loss compensation unit 320, a state checking unit 330, and a synchronization unit 340.

The gateway 310 may collect the amount of current measured from each of the plurality of CT sensors 160.

Loss compensator (320) The amount of power converted from the sum of the current measured by the plurality of CT sensors (160) collected from the gateway (310), and the meter for transformer meter reading by the remote metering device (200) through the power meter (130) The first power amount difference value between the power consumption values of 120 may be calculated, and a loss compensation value of the pre-stored transformer 140 may be applied to the first power amount difference value. Here, applying the loss compensation value of the transformer 140 includes adding the loss compensation value of the transformer 140 to the sum of the current amounts measured by the plurality of CT sensors 160 collected from the gateway 310. Can be.

The state checker 330 adds the loss compensation value of the transformer 140 to the sum of the current amounts measured by the plurality of CT sensors 160 collected from the gateway 310, and the remote meter reading device 200 If the second power difference value between the power consumption of the meter transformer 120 read through the wattmeter 130 is less than the reference error, it is determined that the meter transformer 120 is operating normally, and the second power difference value is When the reference error is exceeded, it may be determined that an abnormality has occurred in the transformer for instrument 120.

When the state check unit 330 determines that an abnormality has occurred in the transformer 120 for the instrument because the second electric power difference value exceeds the standard error, the instrument for transforming the special high pressure included in the transformer for the instrument 120 to low pressure It may be determined that an abnormality has occurred in one or more of the transformation ratio of the transformer PT and the transformation ratio of the current transformer CT for transforming the high current to a low current.

Synchronization unit 340, the time to measure the power consumption of the transformer 120 for the instrument through the watt hour meter 130, a plurality of CT sensors 160 to measure the amount of current, the plurality of CT sensors 160 Can be controlled. That is, the synchronization unit 240 may match the measurement time of the electric power measurement time of the watt hour meter 130 and the current amount of the CT sensor 160. For example, when the time for measuring the amount of power of the watt-hour meter 130 is from 12:00 to 12:15, the CT sensor 160 also measures the amount of current from 12:00 to 12:15. You can control the operation. The operation control signal of the CT sensor 160 may be transmitted to the CT sensor 160 through the gateway 310.

3 is a flowchart illustrating a method for checking the state of a transformer for an instrument according to an embodiment of the present invention. In the following description, portions that overlap with the description of FIG. 2 will be omitted.

Referring to FIG. 3, in step S310, the condition checking device 300 collects the amount of current measured from each of the plurality of CT sensors 160 included in the power receiving facility 100.

In step S320, the condition checking device 300 collects the result of the remote meter reading of the power usage of the transformer 120 for the instrument measured by the electricity meter 130 included in the power receiving facility 100 from the remote meter device 200.

In step S330, the state checking device 300 is a transformer for the meter reading the amount of power converted from the sum of the amount of current measured by the plurality of CT sensors 160 and the meter reading the remote meter 200 through the wattmeter 130 ) Calculates a first power amount difference value between the power usage amounts, and applies a loss compensation value of the pre-stored transformer 140 in response to the first power amount difference value. Here, applying the loss compensation value of the transformer 140 includes adding the loss compensation value of the transformer 140 to the sum of the current amounts measured by the plurality of CT sensors 160 collected from the gateway 310. Can be.

In step S340, the state check device 300 is a plurality of CT sensors 160 collected by adding the loss compensation value of the transformer 140 to the sum of the current amount measured, and the remote meter reading device 200 It is determined whether the second power difference value between the power consumptions of the transformer 120 for meter reading through the watt hour meter 130 exceeds the reference error.

In step S350, the state checking device 300 determines that the instrument transformer 120 is operating normally when the second power difference value is less than the reference error.

In step S360, the state checking device 300 determines that an abnormality has occurred in the instrument transformer 120 when the second power difference value exceeds the reference error.

In an exemplary embodiment, the state checking device 300 may transmit an operation control signal to the CT sensor 160 to match the measurement time of the amount of power of the wattmeter 130 and the amount of current of the CT sensor 160.

The embodiment according to the present invention described above may be implemented in the form of a computer program that can be executed through various components on a computer, and such a computer program can be recorded on a computer-readable medium. At this time, the medium is a hard disk, a magnetic medium such as a floppy disk and magnetic tape, an optical recording medium such as CD-ROM and DVD, a magneto-optical medium such as a floptical disk, and a ROM , Hardware devices specially configured to store and execute program instructions, such as RAM, flash memory, and the like.

Meanwhile, the computer program may be specially designed and configured for the present invention, or may be known and available to those skilled in the computer software field. Examples of computer programs may include not only machine language codes produced by a compiler, but also high-level language codes executable by a computer using an interpreter or the like.

In the specification (particularly in the claims) of the present invention, the use of the term " above " and similar indication terms may be in both singular and plural. In addition, in the case of describing a range in the present invention, as including the invention to which individual values belonging to the range are applied (if there is no contrary description), each individual value constituting the range is described in the detailed description of the invention Same as

Unless explicitly stated or contrary to the steps constituting the method according to the invention, the steps can be done in a suitable order. The present invention is not necessarily limited to the description order of the above steps. The use of all examples or exemplary terms (eg, etc.) in the present invention is merely for describing the present invention in detail, and the scope of the present invention is limited due to the examples or exemplary terms unless defined by the claims. It does not work. In addition, those skilled in the art can recognize that various modifications, combinations, and changes can be configured according to design conditions and factors within the scope of the appended claims or equivalents thereof.

Accordingly, the spirit of the present invention is not limited to the above-described embodiments, and should not be determined, and the scope of the spirit of the present invention, as well as the claims to be described later, and all ranges that are equivalent to or equivalently changed from the claims Would belong to

1: Instrument transformer health check system
100: faucet facility
200: remote meter reading device
300: health check device

Claims (8)

It is connected to the inlet switch and transforms a special high voltage to a first low voltage and a transformer for an instrument that transforms a high current into a low current, a power meter for measuring the power consumption of the transformer for the instrument, and the first low pressure of the transformer for the instrument. 2 A transformer that transforms to low voltage, a plurality of loads operating at the second low voltage of the transformer, and a plurality of CT sensors provided between each of the transformer and the loads to measure the amount of current flowing into each of the loads. Faucet facilities including;
A remote meter reading device connected to the watt-hour meter to remotely check the power consumption of the instrument transformer; And
It includes a state checking device for comparing the amount of power converted from the amount of current measured by the plurality of CT sensors and the power usage of the transformer for metering read by the remote metering device to check whether the metering transformer is in a faulty state. The instrument transformer health check system. According to claim 1, The condition checking device,
A gateway for collecting the amount of current measured by the plurality of CT sensors;
The first power amount difference value between the amount of power converted from the sum of the amount of current measured by the plurality of CT sensors collected from the gateway and the amount of power used by the meter transformer read by the remote meter reading device is stored in advance. A loss compensation unit applying a loss compensation value of the transformer; And
The second amount of power between the amount of power converted by adding the loss compensation value of the transformer to the sum of the amount of current measured by the plurality of CT sensors collected from the gateway, and the amount of power used by the transformer for meter reading by the remote meter reading device. When the difference value exceeds the reference error, a condition check unit for determining that an abnormality has occurred in the transformer for the instrument; including, the instrument transformer condition inspection system. The method of claim 2, wherein the status check unit,
When the difference value of the second power exceeds the reference error, the ratio of the transformer for the instrument for transforming the special high voltage included in the transformer for the instrument to the first low voltage and the transformer for the instrument for transforming the high current into the low current A system for checking the condition of a transformer for an instrument that determines that an abnormality has occurred in one or more of the ratios of the transformer. The method of claim 2, wherein the condition checking device,
And a synchronization unit configured to control the plurality of CT sensors so that the time of measuring the amount of power consumption of the meter transformer of the watt-hour meter follows the current amount measurement time of the plurality of CT sensors. By the state checking device, the transformer for the instrument connected to the inlet switch, the electricity meter for measuring the power consumption of the transformer for the instrument, the transformer connected to the transformer for the instrument, and a plurality of loads operating at a second low voltage of the transformer and , Collecting the amount of current flowing into each of the load measured by the plurality of CT sensors among the power receiving equipment including a plurality of CT sensors provided between each of the transformer and the plurality of loads;
Collecting, by the condition checking device, power consumption of the instrument transformer that is connected to the wattmeter and that the remote meter reading device performs remote meter reading; And
The state checking device compares the amount of power converted from the amount of current measured by the plurality of CT sensors with the power consumption of the meter transformer, which is read by the remote meter reading device, and checks whether the meter transformer is in a fault condition. A method of checking the condition of the transformer for the instrument, including the step of doing. The method of claim 5, wherein the checking step,
In response to a first electric power difference value between the electric power amount converted from the sum of the electric currents measured by the plurality of CT sensors and the electric power consumption of the transformer for the instrument read by the remote meter reading device, the loss compensation value of the pre-stored transformer Applying it; And
The second amount of power between the amount of power converted by adding the loss compensation value of the transformer to the sum of the amount of current measured by the plurality of CT sensors collected from the gateway, and the amount of power used by the transformer for meter reading by the remote meter reading device. If the difference value exceeds the reference error, determining that an abnormality has occurred in the transformer for the instrument; including, the method for checking the state of the transformer transformer. The method of claim 6, wherein the determining step,
When the difference value of the second power exceeds the reference error, the ratio of the transformer for the instrument for transforming the special high voltage included in the transformer for the instrument to the first low voltage and the transformer for the instrument for transforming the high current into the low current Determining that an abnormality has occurred in one or more of the denaturation ratio; including, the method for checking the state of the transformer transformer. The method of claim 5,
Controlling the plurality of CT sensors so that the time for measuring the amount of power consumption of the transformer for the instrument of the watt-hour meter follows the current amount measurement time of the plurality of CT sensors by the condition checking device; How to check the condition of the transformer.

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