KR101545513B1 - System for testing of digital protective relay for main power facility on nuclear power plant, and operation method of said system - Google Patents

Abstract

Disclosed is an operating method of a system for testing a protective relay for a nuclear power plant. The operating method of a system for testing a protective relay for a nuclear power plant comprises: a step where a protective relay performance verification device acquires malfunction waveform data through system modeling for the main power facility in a nuclear power plant; a step where a voltage/current generator uses the acquired malfunction waveform data to generate a real malfunction waveform voltage and current; a step where the voltage/current generator applies the generated voltage and current to the protective relay; and a step where the protective relay performance verification device analyzes transient interaction characteristics of the protective relay to verify performance of the protective relay.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and a method for operating a digital protection relay for protecting a main power plant of a nuclear power plant,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system for digital protection relay verification and a method of operating the same, and more particularly, to a system and a method for operating a digital protection relay for protecting a main power facility of a nuclear power plant.

The protective relay is a device that protects the equipment by measuring the voltage and current of the main power plant of the power plant and separating fault detection, shutdown signal transmission and fault section. Recently, triple protection digital protection relay has been introduced to protect main power plant of nuclear power plant .

Digital protection relay has advantages such as easy to analyze cause of failure and reduction of installation area but it is difficult to prevent malfunction due to module (analog input / output, digital input / output, communication, CPU, power supply) It is necessary to verify the reliability of the protection factor and improve the understanding of the operator.

Conventional reliability verification methods of protection relays are focused on static characteristic tests that measure only the operation value and time of the protection element user, so that it is difficult to verify the cooperation between the protection elements, the transient phenomenon in case of system failure, have.

In addition, due to the nature of protective relay, which is a generation stopping device, the access is restricted during operation of the generator and the maintenance period during which the access is permitted is also very short, making it difficult to improve the operator's understanding and utilization ability of the digital protection relay.

It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a system and method that can verify the protection characteristics of the protection relay period and the transient phenomenon using the failure waveforms of the main power system of the nuclear power plant, The system is implemented to provide a digital protection relay verification system that can be used directly for fault maintenance as well as for personnel training.

According to another aspect of the present invention, there is provided a method of operating a system for verifying a protection relay of a nuclear power plant, the method comprising: acquiring fault waveform data through system modeling of a main power plant of a power plant; Generating a fault waveform actual voltage and current using the acquired fault waveform data; applying the generated voltage and current to the protection relay by the voltage and current generator; And analyzing the transient phenomenon dynamic characteristics of the relay to verify the performance of the protection relay.

The step of acquiring the fault waveform data through system modeling of the generator and the transformer constituting the power main power ratio of the plant includes selecting the plant main power plant, the fault section and the fault type, and the step of selecting the plant main power plant, And acquiring fault waveform data corresponding to the fault type.

The fault waveform data includes the rated capacity of the generator and the transformer constituting the selected main power plant of the power plant, the line impedance of the transmission line, the type of transformer (CT, PT) and the characteristic curve of the generator, Can be acquired through system modeling.

Fault waveform types include 1) ground fault, short circuit, field loss, overexcitation, CT saturation phenomenon, 2) transformer high voltage side ground fault, short circuit, inrush current and CT phenomenon on the generator terminal side of the protection relay of the generator, and 3) Logo field, and external ground fault inflow phenomenon.

The step of verifying the performance of the protective relay by analyzing the transient phenomenon dynamic characteristics of the protective relay may include a step of performing an analysis on the cooperation relationship between the protection elements of the protective relay, a transient phenomenon occurring when the system is broken, .

The analysis of the response characteristics of the generator protection relays is based on the short-circuit fault test of the ratio differential protection element, the external fault and the CT saturation test, the short-circuit fault of the distance relay protection element, the ground fault test, the PT fuse, The test is carried out through the test of the current unbalance protection element, the overvoltage protection test at the generator station pressurization and the overrun protection element test. The analysis of the response characteristic of the transformer protective relay is performed by the short fault test, the external fault and the CT saturation test, Excitation current trip, harmonic block test, neutral point ground / ungrounded test of ratio differential ground fault protection element and external ground fault fault input test.

In order to accomplish the above object, the present invention provides a system for verifying the protection relay of a nuclear power plant, comprising: acquiring fault waveform data through system modeling of a main power plant of a power plant, analyzing transient phenomenon characteristics of the protection relay, A protective relay performance verifying device for verifying the performance of the relay, a voltage and current generator for generating the actual voltage and current of the fault waveform using the acquired fault waveform data, and applying the generated voltage and current to the protection relay, And a protection relay for transmitting operation data on the actual voltage and current to the protective relay performance verifying device.

The protective relay performance verifying apparatus includes a mode selection unit for selecting the main power plant of the power plant, a failure section and a failure type, and a data acquisition section for acquiring failure waveform data corresponding to the selected main power plant, the failure section and the failure type can do.

The fault waveform data includes the rated capacity of the generator and the transformer constituting the selected main power plant of the power plant, the line impedance of the transmission line, the type of transformer (CT, PT) and the characteristic curve of the generator, Can be acquired through system modeling.

The protection relay performance verifying apparatus can analyze the cooperation relationship between the protection elements of the protection relay, the transient phenomenon occurring when the system fails, and the operation logic.

According to the system and the operation method of the digital protection relay for protecting the main power equipment of the present invention, it is possible to verify the protective factor correction, internal logic, and protection cooperation through the dynamic characteristic test, Is prevented in advance.

In addition, it is possible to analyze the response characteristics and vulnerability of the protection relay by simulating the fault type transient phenomenon of the main power system of the power plant, and it contributes to stable operation of the plant, improvement of utilization rate and economic profit by improving the reliability of the protection system.

In addition, operators can improve their business capabilities by providing training opportunities such as testing and troubleshooting of digital protection relays.

FIG. 1 is a block diagram schematically showing a system for digital protection relay verification according to an embodiment of the present invention.
FIG. 2 is a flowchart schematically illustrating an operation method of a digital protection relay authentication system according to an embodiment of the present invention. FIG.
3 is a diagram showing the power plant main power system modeling and the short-circuit failure waveform on the generator AB,
FIG. 4 is a detailed block diagram specifically illustrating an apparatus for verifying the performance of a protective relay of a system for demonstrating a digital protection relay according to an embodiment of the present invention.
5 is a diagram for explaining an example of an analysis through a dynamic characteristic test.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. 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 another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

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 there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, 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 should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

FIG. 1 is a block diagram schematically illustrating a system for demonstrating a digital protection relay according to an embodiment of the present invention. Referring to FIG. 1, a digital protection relay verification system according to an embodiment of the present invention includes a protection relay performance verifying apparatus 100, a voltage and current generator 110, a protection relay 120, and a mock circuit breaker 130 ). Here, the mimic circuit breaker 130 may be omitted as needed.

Referring to FIG. 1, the protection relay performance verifying apparatus 100 acquires fault waveform data of an actual main power facility, provides the fault waveform data to the voltage and current generator 110, and monitors the operation state of the protection relay 120. In addition, the protection relay performance verifying apparatus 100 can change the setting of the protection relay 120. [ The protection relay performance verifying apparatus 100 can receive various data and status information related to the main power facility detected by the protection relay 120 from the protection relay 120. When the equipment under test, the fault section, and the fault type are selected in the protective relay performance verifying apparatus 100, the fault waveform information is provided to the voltage and current generator 110.

The voltage and current generator 110 receives the fault waveform information from the protection relay performance verifying apparatus 100 and generates the same actual voltage and current as the received information and applies the same to the protection relay 120.

The protection relay 120 receives the actual regenerated voltage and current of the fault waveform applied from the voltage and current generator 110 as an input and directly or indirectly interrupts the simulated circuit breaker 130 in response to the fault waveform ) Can be performed. The protection relay 120 receives the actual current and voltage input thereto, detects the magnitude or phase of the voltage and current, determines whether the magnitude or phase of the sensed voltage and current is larger or smaller than the threshold value, To the protection relay performance verification apparatus 100. [ The related data may include at least one of a protection element operation state, a stored event, and fault related data. Upon receiving such data, the protection relay performance verifying apparatus 100 can analyze the received data and verify the performance of the protection relay 120. [ In some cases, the protective relay performance verifying apparatus 100 can directly control the opening and closing of the mock-up circuit breaker 130, and can directly receive the status information from the mock circuit breaker 130.

The simulation circuit breaker 130 is a component that simulates a function of shutting down the main power supply of the generator and can operate under the control of the protection relay performance verifying apparatus 100 and the protection relay 120.

2 is a flowchart schematically illustrating an operation method of a digital protection relay verification system according to an embodiment of the present invention.

Referring to FIG. 2, the protection relay performance verifying apparatus selects an EUT, a fault section, and a fault type (S210). This selection can be performed through a user interface (not shown) of the protective relay performance verifying device. That is, through the user interface, the user can select the equipment to be tested for the test of the protective relay, the fault zone and the fault type in connection with the display screen. For example, the protective relay performance verifying apparatus can acquire and store fault waveform data of a main power facility in a plurality of nuclear power plants in a storage unit (not shown). The acquisition of the fault waveform data can be performed through system modeling that reflects constants for each power plant of the power plant.

3 is a diagram showing the power plant main power system modeling and the short circuit failure waveform on the generator AB.

Referring to FIG. 3, the protection relay performance verifying apparatus can acquire waveform data for each fault section and fault type through system modeling. 3 shows that the short-circuit failure waveform on the generator AB is obtained. In this way, the protective relay performance verifying apparatus detects, obtains, and stores data corresponding to a failure of a specific section of a specific power plant, The fault waveform data can be secured.

The modeling of the power system is based on the rated capacity,% impedance, the excitation characteristic curve, the line impedance of the transmission line, the type of the transformer (CT, PT) and the excitation characteristic curve for the generator, transformer, It can be constructed to reflect the system equivalence of the counterpart substation.

In addition, the fault waveform section is an interval in which the fault occurs, and can be specified among the components, such as the interval between the first component and the second component in the generator. Alternatively, it may be defined as a section on a line outside the generator.

Fault waveform types can be selected to verify the reactive characteristics of the protective relay against abnormal phenomena such as internal and external faults, CT saturation, and PT fuse disconnection. For example, the protective relay of a generator can be classified into types such as ground fault, short circuit, field loss, overexcitation, and CT saturation at a generator terminal. The protection relay of the transformer is classified into types such as a transformer high voltage side ground fault, short circuit, inrush current, In case of external fault, it may include types of fault such as transmission line failure (including reclosing), external earth fault fault, etc. However, the present invention is not limited thereto.

Referring back to FIG. 2, when the equipment under test, the fault section and the fault type are selected in the protection relay performance verifying apparatus, the fault waveform information is provided to the voltage and current generator, and the voltage and current generator outputs the same actual voltage and A current can be generated and applied to the protection relay (S220). That is, it is possible to demonstrate the same transient phenomenon as the failure waveform acquired through the voltage-current generator equipped with the waveform playback (Play-Back) function in the protection relay.

Then, the protection relay receives the actual voltage and current from the voltage and current generator, and sends each operating element in the protection relay to the protection relay performance verification device in response to the protection relay in the actual failure state. The protection relay performance verification device can analyze the response characteristics of the protection relay based on the data received from the protection relay (S230). At this time, the analysis can be done through the protection cooperation among the protection elements of the protective relay, the coupling operation characteristics and the verification of the transient current dynamic characteristics.

FIG. 4 is a detailed block diagram illustrating an apparatus for verifying the performance of a protective relay of a system for demonstrating a digital protection relay according to an embodiment of the present invention. Referring to FIG. 4, the protective relay performance verifying apparatus 400 according to an exemplary embodiment of the present invention may include a fault waveform data obtaining unit 410 and a data analyzing unit 420. As shown in FIG.

Referring to FIG. 4, the fault waveform data acquisition unit 410 may include a mode selection unit 412 and a data acquisition unit 414. The mode selection unit 412 selects a test facility, a fault section, and a fault type as a user interface. The object to be selected is stored in a storage unit (not shown), the selection is performed through the screen, and the order of selection can be defined through user setting. That is, at least one of the items may be omitted. The data acquisition unit 414 acquires fault waveform data of each of the target facilities, for example, the main power facilities in the power plant. This can be done by receiving fault waveform related data from various power equipment connected through the network and categorizing them. The fault waveform data can be stored for each power facility, fault section, and fault type, and the related fault waveform data can be fetched according to the selection information in the mode selection section 412. [ The fault waveform data is transmitted to the voltage / current generator 450.

The data analyzer 420 analyzes the data received from the protection relay 460 and performs a function of grasping the response characteristic of the protection relay 460. [ The data analysis unit 420 may perform verification through the protection characteristic of the protection relay 460 and an internal logic (e.g., triplexing Flex-Logic) verification test. The flex-logic is logic that configures the stop signal generation conditions using the logic output of each protection relay element, including this logic so that the output data of the protection relay 460 responds to the fault waveform data and properly Can be analyzed. The analysis result may be displayed to the operator through a display unit (not shown). Therefore, it is possible to confirm the difference from the target value considered by the operator. The data analyzer 420 may include a configuration for comparing the target value with respect to the corresponding characteristic of the failure waveform and the output value of the actual protection relay to determine whether an appropriate response is made.

In addition, the response characteristics of the design changes can be verified and the appropriateness can be evaluated by changing the setting value of the protection relay or the interlocking period of the protection relay period before changing the internal logic.

The protection items for the data analysis unit 420 to perform the dynamic characteristic test of the power system protection relay of the main power system of the power plant include the following items.

First, in the protection relay of the generator, the short-circuit failure test of the ratio differential protection element, the external fault and the CT saturation test, the short-circuit failure of the distance relay protection element, the ground fault test (Zone 1 and 3), and the PT fuse disconnection fault simulation Test and field loss protection factor test, current unbalanced protective factor test (including transmission line recloser), overvoltage protection test (including PT fuse breakdown failure simulation) and overcurrent protection test may be performed.

In addition, the analysis of the response characteristics of the transformer protection relay can be carried out by means of short-circuit failure test of the ratio differential protection element, external fault and CT saturation test, excitation current trip, harmonic block test, neutral point ground / Non-ground test and external ground fault fault input test.

5 is a diagram for explaining an example of an analysis through a dynamic characteristic test.

Referring to FIG. 5, an analysis is performed on the protection factor of the main relay of the protection relay (G60, GE), and an example test result of analyzing the response characteristic of the failure type of the distance relay part operation according to the normal pressurization holding time . When the failure is simulated under the condition that the normal pressurization holding time is within 20ms, the relay exhibits an abnormal hysteresis characteristic that the distance relay operates due to blocking due to the VTF malfunction. In other words, it can be confirmed that even if a momentary short-circuit fault occurs in the establishment of the terminal voltage of the generator, the distance relay element becomes inoperable.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions as defined by the following claims It will be understood that various modifications and changes may be made thereto without departing from the spirit and scope of the invention.

Claims (10)

A method of operating a system for demonstrating a protective relay of a nuclear power plant,
Obtaining fault waveform data through system modeling of the power plant main power facility by the protective relay performance verifying apparatus;
Generating a fault waveform actual voltage and current using the acquired fault waveform data;
The voltage and current generator applying the generated voltage and current to the protection relay; And
And verifying the performance of the protection relay by analyzing the transient phenomenon dynamic characteristics of the protection relay by the protection relay performance verifying apparatus. 2. The method of claim 1, wherein the step of acquiring fault waveform data through systematic modeling of a generator and a transformer constituting the plant main power ratio comprises
Selecting the plant main power plant, the fault section and the fault type; And
And acquiring fault waveform data corresponding to the selected main plant power plant, fault section, and fault type of the selected plant. 3. The method of claim 2,
The fault waveform data includes the rated capacity of the generator and the transformer constituting the selected main power plant of the power plant, the line impedance of the transmission line, the type of transformer (CT, PT) and the characteristic curve of the generator, System modeling of the protection relay of the nuclear power plant. 2. The method of claim 2, wherein the fault waveform types include: 1) ground fault, short circuit, field loss, overexcitation, and CT saturation of the generator protection terminal of the generator protection relay, 2) transformer high voltage side ground fault, short circuit, And 3) the failure of the transmission line and the inflow of the external ground fault. The method for operating the system for the demonstration of the protection relay of the nuclear power plant. 2. The method of claim 1, wherein the performance of the protection relay is verified by analyzing transient phenomenon characteristics of the protection relay,
And performing an analysis of a transition phenomenon occurring when a system failure occurs and an operation logic of the protection relay of the protection relay, and a method of operating the system for demonstrating the protection relay of the nuclear power plant. 6. The method of claim 5,
The analysis of the response characteristics of the generator protection relays is based on the short-circuit fault test of the ratio differential protection element, the external fault and the CT saturation test, the short-circuit fault of the distance relay protection element, the ground fault test, the PT fuse, Test, current unbalance protective factor test, overvoltage protection test at generator station pressurization and overcurrent protective factor test,
The analysis of the response characteristics of the transformer protection relays is based on the short-circuit fault test of the ratio differential protection element, the external fault and CT saturation test, the inrush current trip, the harmonic block test, the neutral point ground / And the external earth fault fault inflow test. The method of claim 1, In a system for demonstrating protective relays of a nuclear power plant,
A protective relay performance verifying device that acquires fault waveform data through system modeling on a main power plant of a power plant and verifies performance of the protective relay by analyzing transient phenomenon dynamic characteristics of the protective relay;
A voltage and current generator for generating an actual voltage and current of the fault waveform using the acquired fault waveform data and applying the generated voltage and current to the protection relay; And
And a protection relay for transmitting operation data on the applied voltage and current of the fault waveform to the protection relay performance verifying apparatus. 8. The apparatus of claim 7, wherein the protective relay performance verifying apparatus
A mode selection unit for selecting the main power plant of the power plant, a fault section and a fault type; And
And a data acquisition unit for acquiring fault waveform data corresponding to the selected power plant main power plant, fault section, and fault type of the selected plant. 9. The method of claim 8,
The fault waveform data includes the rated capacity of the generator and the transformer constituting the selected main power plant of the power plant, the line impedance of the transmission line, the type of transformer (CT, PT) and the characteristic curve of the generator, And the system is obtained through system modeling. 8. The apparatus of claim 7, wherein the protective relay performance verifying apparatus
Wherein the protection relays cooperate with each other, analyze transient phenomena occurring when the system fails, and analyze the operation logic of the protection relays.

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