Testing device, testing method, and program for power system protection control system

A testing device tests an intelligent electronic device of a power system. A PC generates failure data by performing: simulation calculation for a CT and a PT with respect to current waveform data of a current transformer and voltage waveform data of a potential transformer based on a characteristic of an instrument transformer; and simulation calculation for an MU with respect to the current waveform data of the current transformer and the voltage waveform data of the potential transformer based on a characteristic of the MU. The testing device acquires device information data indicating a circuit breaker of the power system, in synchronization with the failure data. The testing device transmits the failure data and the device information data to the intelligent electronic device via a process bus in accordance with a setting of outputting data to the process bus and a setting of sampling.

TECHNICAL FIELD

The present invention relates to a testing device for testing an intelligent electronic device, which is configured to (i) acquire at least information of current or voltage from a power system, (ii) detect failure in the power system, a power facility, or the like, and (iii) separate the failure from the power system.

BACKGROUND ART

In order to stabilize service of a power system, various types of devices have been utilized to detect occurrence of outages or malfunctions in the power system. For example, an intelligent electronic device (IED) is configured to (i) acquire results of measurement of voltage value and current value in the power system from a current transformer (CT), a potential transformer (PT) (or voltage transformer (VT)), and the like, (ii) detect occurrence of overvoltage, shortage of voltage, overcurrent, or the like due to failure or the like, and (iii) send a control signal to a circuit breaker. Accordingly, a countermeasure can be immediately taken by, for example, separating the failed section from the power system.

Since such an intelligent electronic device requires high reliability, the intelligent electronic device is subjected to various performance check tests in various aspects, for example, before shipment or during service.

Japanese Patent Laying-Open No. 2011-155779 (Patent Document 1) describes a digital protective power relay device having a testing function. In this digital protective power relay device, a digital relay is provided with a memory in which data of voltage waveform or current waveform corresponding to power system failure and input conditions such as device conditions in the power system side are written beforehand. This digital protective power relay device is provided with a switch, which is externally switchable to read out either (i) an amount of analog input acquired from the power system side or (ii) the waveform data written in the memory. The relay device is verified by: switching the switch to the side of the memory having the waveform data written therein; sequentially reading out the waveform data from the memory at a sampling cycle of the protective relay; and performing calculation for the relay in accordance with the data thus read out. Accordingly, a similar effect is obtained as with the case of externally applying current and voltage waveforms for simulating power system failure by utilizing a simulation power transmission line.

Japanese Patent Laying-Open No. 2012-249387 (Patent Document 2) describes the following technique: in a power system protection control system employing a process bus, for the purpose of a test, a testing device is connected to the process bus, and the testing device outputs, to an intelligent electronic device via the process bus, test electric quantity information having a test flag added therein. Based on the test electric quantity information received from the testing device, the intelligent electronic device determines whether to trip a circuit breaker. If it is determined to trip, the intelligent electronic device outputs to the process bus a test trip command having the test flag added therein. When a merging unit (MU) receives the test trip command via the process bus, the merging unit determines that the operation of the intelligent electronic device outputting the trip command is normal.

CITATION LIST

Patent Document

SUMMARY OF INVENTION

Technical Problem

According to the technique described in Patent Document 1, however, the data of the prepared memory, which has the voltage waveform data and current waveform data corresponding to the power system failure and the information of the devices in the power system, is used for the test, so that the intelligent electronic device includes hardware necessary for the test but unnecessary for normal service. Accordingly, the intelligent electronic device becomes expensive, and percent defective may become high due to the inclusion of the hardware unnecessary for normal service, disadvantageously.

On the other hand, the technique described in Patent Document 2 is directed to checking whether or not the intelligent electronic device in service is normal. Therefore, the technique described in Patent Document 2 is not sufficient to comprehensively check performance before starting service by, for example, determining whether or not the intelligent electronic device is applicable to the power system, or determining whether to connect the MU and the intelligent electronic device when combining the MU and the intelligent electronic device in the power system protection control system. In recent years, an intelligent electronic device and an MU may be provided by different manufacturers, so that it is important to comprehensively check performance by connecting the intelligent electronic device and the MU before starting service. Further, in an ongoing process of standardization for filter characteristics and dynamic ranges (DR) of MUs and for control of transmission of data in response to time synchronization signals in power system protection control systems, it is more important to check for connection with an MU and an intelligent electronic device before starting service.

Moreover, various devices are used for instrument transformers. Examples of the instrument transformers may include: an iron-core CT; an ECT (Electric CT) employing an air-core CT (Rogowski CT); and a CVT (Capacitance VT) employing a capacitor to divide voltage into small voltage. Therefore, characteristics of CTs and PTs, such as frequency characteristic and transient characteristic, may greatly differ among the CTs and PTs.

Hence, power system protection control systems need to be tested in view of the characteristics of these CTs, PTs, and MUs. In light of the problems described above, an object of the present disclosure is to provide a testing device capable of simulating comprehensive check in advance with regard to performance attained when installing an intelligent electronic device in a power system.

Solution to Problem

A testing device according to one embodiment is for testing an intelligent electronic device of a power system. The testing device acquires failure data resulting from simulation calculation for a CT and a PT and simulation calculation for an MU, the simulation calculation for the CT and the PT being performed with respect to current waveform data and voltage waveform data in the power system based on a characteristic of an instrument transformer, the simulation calculation for the MU being performed with respect to the current waveform data and voltage waveform data in the power system based on a characteristic of the MU. The testing device acquires device information data in synchronization with the failure data, the device information data indicating a circuit breaker of the power system. The testing device transmits the failure data and device information data to the intelligent electronic device via the process bus in accordance with a setting of outputting data to the process bus and a setting of sampling.

Advantageous Effects of Invention

According to the testing device in accordance with the one embodiment described above, comprehensive performance check can be simulated in advance before applying the intelligent electronic device and the MU to protection control of the power system because the failure data, which results from (i) the simulation calculation for the CT and the PT based on the characteristics of the instrument transformers and (ii) the simulation calculation for the MU according to the characteristic of the MU, is transmitted to the intelligent electronic device in synchronization with the device data. This reduces a possibility of occurrence of a problem due to connection with the MU and the intelligent electronic device after starting service.

DESCRIPTION OF EMBODIMENTS

The following describes embodiments of the present invention with reference to figures. In the description below, the same reference characters are given to the same components. Their names and functions are also the same. Hence, they are not described in detail repeatedly.

<Entire System Configuration in First Embodiment>

First, the following describes an entire configuration of a protection control system including a testing device (TEST-MU (Merging Unit)) in accordance with a first embodiment.

FIG. 1shows an entire configuration of a protection control system1including a testing device in accordance with the present embodiment. With reference toFIG. 1, protection control system1is provided in a substation, a power distribution station, or the like to collect information of the power system and to perform processes such as protection, control, and monitoring of the power system based on the collected information.

More specifically, protection control system1includes: a plurality of merging units10-1,10-2(hereinafter, also collectively referred to as “merging unit10”) each configured to collect information, such as current and voltage, from the power system; and a plurality of intelligent electronic devices20-1to20-N (hereinafter, also abbreviated as “IED” and also collectively referred to as “intelligent electronic device20”) configured to protect, control, and monitor the power system. Data communication can be made between merging units10-1to10-5and intelligent electronic devices20-1to20-N via a process bus22. Generally, in protection control system1, the plurality of intelligent electronic devices20are disposed based on purposes of use (for example, based on targets of protection or based on targets of control). Examples of the IEDs thus disposed based on the purposes of use include: a protective IED configured to implement a protective function; and a control IED configured to implement a control function.

Each merging unit10sends (i) the information collected from the power system to (ii) an intelligent electronic device20corresponding to that merging unit10. Based on the information received from corresponding merging unit10, each of intelligent electronic devices20performs a process such as protection, control, or monitoring of the power system.

More specifically, by way of an example of the protective function, intelligent electronic device20determines, at a predetermined cycle, whether or not a relay calculation logic set in advance is established, and outputs a trip signal to a corresponding circuit breaker when the relay calculation logic is established. This trip signal may be transmitted via process bus22.

On the other hand, by way of an example of the control function, intelligent electronic device20can output a command to close/open a switch in the power system, for example. Further, by way of an example of the monitoring function, if some power system failure occurs, intelligent electronic device20can log information of the power system before and after the occurrence of the power system failure, and can output the state of the power system in real time. For example, intelligent electronic device20is connected to a substation automation system (SAS) device26and a remote monitoring control device28via a station bus24. Also, intelligent electronic device20can output the information of the power system to substation automation system device26, and also can output the information of the power system to a remote control center30, which is distant away from the power facility of interest, via remote monitoring control device28. Furthermore, intelligent electronic device20can be configured to implement intended processes other than the processes described above. For example, intelligent electronic device20may be utilized to implement a function equivalent to substation automation system device26.

In a power transmission line2, a circuit breaker6-1, a current transformer (CT)7-1, and a potential transformer (PT) (/voltage transformer (VT))8-1are provided. Current transformer7-1measures information (current waveform) of current flowing through power transmission line2. Potential transformer8-1measures information (voltage waveform) of voltage generated in power transmission line2. Although not shown for ease of description, in the case of three-phase alternating current, a current transformer and a potential transformer are provided for each of the three phases. The respective pieces of information measured by current transformer7-1and potential transformer8-1are sent to merging unit10-1. In other words, merging unit10-1collects (i) the information of the current flowing through power transmission line2and (ii) the information of the voltage generated in power transmission line2.

Likewise, in a supply line4, a circuit breaker6-2, a current transformer7-2, and a potential transformer8-2are provided. Respective pieces of information measured by current transformer7-2and potential transformer8-2are sent to merging unit10-2. It should be noted that the current transformers may be also collectively referred to as “current transformer7”. Moreover, the potential transformers may be also collectively referred to as “potential transformer8”. Moreover, the circuit breakers may be also collectively referred to as “circuit breaker6”.

Merging unit10-1receives device information (DI) of circuit breaker6-1. Likewise, merging unit10-2receives device information (DI) of circuit breaker6-2. Each merging unit10converts the received data into digital data. Merging unit10, which is configured to receive a time synchronization signal from outside, performs synchronization control for sampling or the like in accordance with the time synchronization signal and outputs digital data to process bus22as serial data. The serial data thus output to process bus22is received by intelligent electronic device20connected to process bus22. Intelligent electronic device20uses the received serial data to perform protection control calculation in order to determine whether or not the power system is failed. If it is determined that the power system is failed, intelligent electronic device20outputs a trip command to a circuit breaker associated with the failure, thereby separating the failure point from the power system.

A testing device (TEST-MU)50of the first embodiment is connected to process bus22. Moreover, testing device50is connected to a PC (Personal Computer)60, which is a general-purpose information processing device, via a general-purpose input/output IF (interface), for example.

Next, the following describes overview of merging unit10in accordance with the present embodiment.

FIG. 2shows a functional configuration of merging unit10. With reference toFIG. 2, a measured value (analog signal) from an instrument transformer (CT, PT) provided in the power transmission line, the bus, or the like is sent to merging unit10. Merging unit10collects current information and/or voltage information of the power system, and outputs digital data indicating the collected information to intelligent electronic device20. In other words, pieces of information necessary for protection, control, monitoring, and the like of the power system are collected in merging unit10. Examples of this digital data typically include serial data in which measured values are arranged in series in the order of sampling times. Merging unit10receives current waveform signal and/or voltage waveform signal of the power system, digitally converts the current waveform signal and/or voltage waveform signal, and then outputs the digitally converted current waveform signal and/or voltage waveform signal via process bus22as serial data.

Merging unit10includes an isolation transformer11, an analog filter12, an AD (Analog to Digital) conversion circuit13, a data buffer memory circuit14, a process bus IF circuit15, a reception circuit16, a sampling control circuit17, a data reading circuit18, and an isolation circuit19. Isolation transformer11receives at least one of (i) a current waveform measured by current transformer7and (ii) a voltage waveform measured by potential transformer8. The data received from current transformer7or potential transformer8is isolated by isolation transformer11, and is converted by an internal circuit of merging unit10to have an appropriate voltage signal level.

Analog filter12removes a high-frequency noise component superimposed on the received current waveform or voltage waveform.

AD conversion circuit13converts the analog input signal into digital data in accordance with a sampling control signal from sampling control circuit17, and data buffer memory circuit14holds the converted digital data therein.

Isolation circuit19receives device information (DI) indicating circuit breaker6or the like, and converts the received signal into a signal having a certain voltage.

Data reading circuit18holds the signal converted by isolation circuit19and reads the device information (DI) in accordance with the sampling control signal from sampling control circuit17, and then data buffer memory circuit14holds the device information (DI).

Reception circuit16receives a time synchronization signal from an external system (for example, GPS (Global Positioning System)) and outputs it to sampling control circuit17.

Sampling control circuit17receives the time synchronization signal from reception circuit16, and outputs a sampling control signal indicating a timing of sampling to AD conversion circuit13, data buffer memory circuit14, process bus IF circuit15, and data reading circuit18.

Data buffer memory circuit14holds (i) the digitally converted data of the received current waveform or voltage waveform, and (ii) the device information to be synchronized with this data. In accordance with the sampling control signal from sampling control circuit17, data buffer memory circuit14converts the held data into data compliant with a protocol defined in process bus22, and outputs the resulting data to process bus22via process bus IF circuit15.

Process bus IF circuit15is an interface configured to sequentially output data to process bus22as serial data.

With reference toFIG. 3, the following describes a configuration of PC60connected to testing device50.

FIG. 3is a block diagram showing a configuration of PC60. PC60includes a CPU (Central Processing Unit)601, a ROM (Read Only Memory)602, a RAM (Random Access Memory)603, a display604, a microphone605, a touchpad606, a keyboard607, a general-purpose input/output IF608, a communication IF609, and a speaker610.

CPU601executes various types of programs including an OS (Operating System) to control operation of PC60. ROM602stores BIOS (Basic Input/Output System) and various types of data. RAM603provides a work area for storing data necessary for CPU601to execute a program. Display604displays various types of information. HDD (Hard Disk Drive)605stores a program or the like in a non-volatile manner.

Touchpad606, which is an operation member configured to receive a user's input operation, receives the user's touch as an input operation by detecting the user's touch by way of a capacitive method, for example. Keyboard607, which is an operating member configured to receive the user's input operation, receives a key input from the user. General-purpose input/output IF608, which is a general-purpose input/output interface such as a USB (Universal Serial Bus), serves as an interface configured to provide connection to an external device. Communication IF609is an interface for communication in compliance with a LAN (Local Area Network) standard or the like. Speaker610outputs sound in accordance with control of CPU601.

<Overview of Testing Device50>

With reference toFIG. 4, the following describes a configuration of testing device50and a functional configuration of PC60.

FIG. 4shows the configuration of testing device50and the functional configuration of PC60. PC60includes a failure calculation unit61, a CT&PT characteristic simulation unit62, an MU characteristic simulation unit63, a data transmission unit64, a device information generation unit65, a TEST-MU transmission setting unit66, and a storage unit67. Storage unit67stores: (i) CT characteristic information621indicating characteristic(s) of a CT, such as a type of the CT, a frequency characteristic of the CT, and/or a transient characteristic of the CT; (ii) PT characteristic information622indicating characteristic(s) of a PT, such as a type of the PT and/or a transient characteristic of the PT; and (iii) MU characteristic information623indicating characteristic(s) of an MU, such as a filter characteristic of the MU and/or a dynamic range of the MU.

Failure calculation unit61performs calculation with respect to current waveform data and voltage waveform data obtained from the CT and the PT in the power system. For example, failure calculation unit61is configured to beforehand hold current waveform data and voltage waveform data corresponding to failure in the power system, or is configured to receive such current waveform data and voltage waveform data corresponding to failure in the power system.

CT&PT characteristic simulation unit62performs simulation calculation to simulate the characteristics of the CT and the PT in accordance with (i) the characteristic of the CT indicated by CT characteristic information621and (ii) the characteristic of the PT indicated by PT characteristic information622.

MU characteristic simulation unit63performs simulation calculation to simulate the characteristic of the MU such as the filter characteristic of the MU in accordance with the characteristic of the MU indicated by MU characteristic information623. Through the processes by CT&PT characteristic simulation unit62and MU characteristic simulation unit63, PC60generates, as failure data, data corresponding to a period of time necessary to verify failure in the power system (for example, data corresponding to a period of time of about several hundred milliseconds to several seconds).

Data transmission unit64transmits, to testing device50, the failure data obtained by MU characteristic simulation unit63, and an IF circuit51of testing device50receives the failure data, which is then stored into a data buffer circuit52of testing device50. In PC60, device information generation unit65generates, in synchronization with the failure data, device information (DI) indicating circuit breaker6(specifically, to change circuit breaker6from the close state to the open state after passage of certain time from power system failure, for example), and data transmission unit64transmits the generated device information (DI), which is then stored into data buffer circuit52together with the failure data.

TEST-MU transmission setting unit66holds transmission setting information (TEST-MU transmission setting information) for causing testing device50to output data to process bus22. This transmission setting information is then stored into a setting circuit54of testing device50via IF circuit51. Examples of the transmission setting information include: (i) PB data output setting information811, which is information indicating a setting value of current or voltage value per bit for testing device50to output serial data to process bus22; and (ii) dynamic range information812indicating a dynamic range of the current or voltage for testing device50to output data through a process bus IF circuit53. Another example of the transmission setting information is a setting about sampling for testing device50to output serial data to process bus22, such as: sampling frequency information821indicating a frequency of sampling; or a time synchronization method setting822indicating a setting of a time synchronization method in accordance with the time synchronization information received by testing device50from the outside.

Testing device50includes IF circuit51, data buffer circuit52, process bus IF circuit53, setting circuit54, a reception circuit55, and a sampling control circuit56.

IF circuit51exhibits a function as an interface for providing connection with PC60.

Data buffer circuit52receives the failure data and the device information from PC60and holds them, and outputs them to process bus22via process bus IF circuit53in accordance with information of a sampling cycle provided from sampling control circuit56.

Process bus IF circuit53outputs the data held by data buffer circuit52to process bus22as serial data in accordance with (i) the information of the sampling cycle provided from sampling control circuit56, (ii) the current and voltage values per bit of the output data set by setting circuit54, or the like.

Setting circuit54is a circuit configured to receive various types of data from PC60and hold them therein, and set a method of outputting the data from testing device50. Setting circuit54includes an output data setting unit81and a sampling setting unit82. Output data setting unit81receives information such as PB data output setting information811and dynamic range information812from PC60, and sets process bus IF circuit53in accordance with settings indicated in these pieces of information so as to cause process bus IF circuit53to output the serial data. From PC60, sampling setting unit82receives information such as sampling frequency information821and time synchronization method setting822, and sets sampling control circuit56in accordance with settings of the sampling indicated in these pieces of information so as to cause process bus IF circuit53to output serial data.

Reception circuit55receives a time synchronization signal from outside, and outputs the received time synchronization signal to sampling control circuit56.

Sampling control circuit56outputs a sampling control signal to process bus IF circuit53and data buffer circuit52based on (i) the setting of the sampling set by sampling setting unit82and (ii) the time synchronization signal received from reception circuit55, thereby controlling the output of the serial data to process bus22by testing device50.

Testing device50is configured to acquire the failure data resulting from the simulation calculation for the CT and the PT and the simulation calculation for the MU, the simulation calculation for the CT and the PT being performed with respect to the current waveform data and voltage waveform data in the power system based on the characteristic information (CT characteristic information621and PT characteristic information622) indicating the characteristic of the instrument transformer, the simulation calculation for the MU being performed with respect to the current waveform data and voltage waveform data in the power system based on the characteristic information (MU characteristic information623) indicating the characteristic of the MU. This configuration is implemented by IF circuit51and data buffer memory circuit52. Moreover, testing device50is configured to acquire the device information data (DI) indicating the circuit breaker of the power system, in synchronization with the failure data. This configuration is implemented by IF circuit51and setting circuit54. Testing device50is configured to transmit the failure data and the device information data (DI) to intelligent electronic device20via process bus22. This configuration is implemented by setting circuit54, data buffer memory circuit52, process bus IF circuit53, and sampling control circuit56.

<Operation in First Embodiment>

With reference toFIG. 5, the following describes operations of PC60and testing device50in the first embodiment.

FIG. 5is a flowchart showing operations of PC60and testing device50.

In a step S601, in PC60, failure calculation unit61acquires at least one of the current waveform data and voltage waveform data corresponding to the case where the power system is failed.

In a step S603, in PC60, CT&PT characteristic simulation unit62performs simulation calculation according to the characteristics of the CT and the PT based on CT characteristic information621and PT characteristic information622.

In a step S605, in PC60, MU characteristic simulation unit63generates failure data by performing, with respect to the data resulting from the simulation calculation performed in step S603, simulation calculation according to the characteristic of the MU based on MU characteristic information623.

In a step S607, in PC60, device information generation unit65generates device information (DI) of the circuit breaker or the like in synchronization with the failure data generated in step S605.

In a step S609, in PC60, data transmission unit64transmits the failure data and the device information (DI) to testing device50, and data transmission unit64transmits, to testing device50, transmission setting information for causing testing device50to output the serial data to process bus22, and then the transmission setting information is held in setting circuit54.

In a step S511, testing device50receives the failure data and the device information (DI) from PC60, and stores them into data buffer circuit52. Testing device50holds, in output data setting unit81and sampling setting unit82, the transmission setting information received from PC60, reads the failure data and the device information (DI) from data buffer circuit52in accordance with the setting indicated in the transmission setting information, and outputs them to intelligent electronic device20via process bus22as the serial data.

As a result of outputting the failure data and the device information (DI) to process bus22in this way, intelligent electronic device20receives the failure data and the device information (DI), and performs protection calculation. Thus, by using testing device50, in protection control system1, it is possible to perform (i) the simulation of the power system failure inclusive of the simulation according to the characteristics of the CT and the PT and (ii) the simulation according to the characteristic of the MU to be actually connected to the power system, whereby before connecting the MU and the IED to the power system, an operation characteristic can be checked as to whether a problem or the like occurs due to the connection with the MU and the IED. This ensures highly reliable verification, which also leads to reduction of test cost and test time. Moreover, since the simulation calculation for the MU is performed by PC60, no current amplifier, voltage amplifier and the like are required.

Second Embodiment

With reference toFIG. 6andFIG. 7, the following describes a configuration of a protection control system according to another embodiment. In comparison with the first embodiment, the characteristic of the MU is simulated by testing device50in the second embodiment, while the characteristic of the MU is simulated by PC60in the first embodiment.

FIG. 6shows a configuration of a testing device50-2and a functional configuration of a PC60-2in the second embodiment. In comparison with PC60of the first embodiment, data transmission unit64in PC60-2of the second embodiment transmits, to testing device50, the current waveform data and voltage waveform data obtained by CT&PT characteristic simulation unit62and resulting from the simulation calculation according to the characteristics of the CT and the PT, and then data buffer memory circuit58of testing device50holds the current waveform data and voltage waveform data therein. TEST-MU transmission setting unit66, which holds MU characteristic information623indicating the characteristic of the MU, transmits MU characteristic information623to testing device50, and then MU characteristic setting unit83of setting circuit54holds MU characteristic information623therein.

In PC60-2, calculation circuit57receives, from MU characteristic setting unit83of setting circuit54, a setting of the simulation calculation according to the characteristic of the MU. Calculation circuit57performs simulation calculation with respect to the current waveform data and voltage waveform data held in data buffer memory circuit58based on MU characteristic information623, so as to simulate the characteristic of the MU such as the filter characteristic of the MU. Calculation circuit57holds, in data buffer circuit52, data resulting from the simulation calculation for simulating the characteristic of the MU.

In the second embodiment, with such a configuration, the characteristic of the MU is simulated by testing device50.

<Operation in Second Embodiment>

FIG. 7is a flowchart showing operations of PC60-2and testing device50-2in the second embodiment.

In a step S608, in PC60, device information generation unit65generates the device information (DI) of the circuit breaker or the like in synchronization with the data resulting from the simulation calculation in step S603.

In a step S610, in PC60, data transmission unit64transmits, to testing device50, (i) the data resulting from the simulation calculation in step S603and (ii) the device information (DI), so as to hold them in data buffer memory circuit58; and data transmission unit64transmits, to testing device50, (i) the transmission setting information for causing testing device50to output the serial data to process bus22and (ii) the MU characteristic information, so as to hold them in setting circuit54.

In a step S513, from PC60, testing device50receives (i) the data resulting from the simulation calculation in step S603(the current waveform data and voltage waveform data that simulates the characteristics of the CT and the PT) and (ii) the device information (DI) and stores them into data buffer memory circuit58, and receives the transmission setting information and the MU characteristic information and stores them into the memory of setting circuit54.

In a step S515, in testing device50, calculation circuit57generates the failure data by performing the simulation calculation with respect to the current waveform data and voltage waveform data stored in data buffer memory circuit58based on the characteristic of the MU so as to simulate the characteristic of the MU, and data buffer circuit52holds the generated failure data therein.

In a step S517, testing device50outputs, to intelligent electronic device20via process bus22as the serial data, the failure data and device information (DI) stored in data buffer circuit52in accordance with the setting indicated in the transmission setting information.

According to such a configuration, the simulation calculation for the MU according to the characteristic of the MU is performed in testing device50. Therefore, when the MU is replaced (with an MU manufactured by a different manufacturer, for example), the calculation results of the current waveform data and voltage waveform data calculated by PC60can be used without any modification because testing device50acquires, from PC60or the like, the information (such as MU characteristic information623) necessary for the simulation of the MU.

Third Embodiment

With reference toFIG. 8, the following describes a configuration of a protection control system according to another embodiment. In comparison with the protection control systems of the first embodiment and the second embodiment, in the protection control system of the third embodiment, testing device50acquires operation information of intelligent electronic device20via a station bus24and accordingly determines whether or not operation of intelligent electronic device20is normal. Thus, the operation of intelligent electronic device20can be checked automatically, thereby resulting in efficient operation check.

FIG. 8shows a configuration of a testing device50-3, a functional configuration of a PC60-3, and a configuration of intelligent electronic device20in the third embodiment.

Intelligent electronic device20includes a PBIF (process bus IF)201, a protection control calculation unit202, an output processing unit203, and an SBIF (station bus IF)204. PBIF201is an interface configured to receive, via process bus22, the data output to process bus22by testing device50. Protection control calculation unit202performs protection calculation based on the failure data or the like received by PBIF201, and outputs the result of protection calculation to output processing unit203. Output processing unit203generates output data for outputting, to testing device50via station bus24, the result of the protection calculation performed by protection control calculation unit202, in accordance with a protocol defined in the station bus. SBIF204outputs the output data to station bus24.

PC60includes an IED determination value transmission unit68and an IED determination result collection unit69. IED determination value transmission unit68transmits, to testing device50, a determination value to be compared with the result of the protection calculation performed by intelligent electronic device20. IED determination result collection unit69receives and collects, from testing device50, a result of comparison between the determination value and the result of the protection calculation performed by intelligent electronic device20.

Testing device50includes an SBIF circuit59, an IED determination value setting unit84, and a determination circuit90. IED determination value setting unit84receives and holds the determination value transmitted by IED determination value transmission unit68of PC60, and sets the determination value at determination circuit90. SBIF circuit59receives data via station bus24. Determination circuit90compares (i) the result of the protection calculation of intelligent electronic device20received by SBIF circuit59with (ii) the determination value set by IED determination value setting unit84. When the result of protection calculation and the determination value fall within a certain range, determination circuit90determines that the calculated result of intelligent electronic device20is normal. Otherwise, determination circuit90determines that the calculated result of intelligent electronic device20is not normal and transmits the determination result to PC60via IF circuit51.

It should be noted that in the example ofFIG. 8, the explanation has been made based on the configurations of the testing device and the PC in the second embodiment; however, the operation of intelligent electronic device20can be automatically checked by the testing device in a similar manner also in the configurations of the testing device and PC in the first embodiment.

Moreover, in the third embodiment, the determination result provided by testing device50-3is collected by PC60-3, but may be collected by testing device50-3.

Fourth Embodiment

With reference toFIG. 9, the following describes a configuration of a protection control system according to another embodiment.FIG. 9shows a configuration of a testing device50-4, a functional configuration of a PC60-4, and a configuration of intelligent electronic device20in the fourth embodiment.

In comparison with the protection control system of the third embodiment, in order to determine whether or not operation of intelligent electronic device20is normal, the testing device in the protection control system of the third embodiment is configured to acquire, via station bus24, the result of the protection calculation performed by intelligent electronic device20. On the other hand, in the fourth embodiment, intelligent electronic device20is connected to testing device50-4via a wire, and the result of the protection calculation is output from intelligent electronic device20to testing device50-4as a contact signal of the output circuit of intelligent electronic device20. In testing device50-4, isolation circuit91acquires the result of the protection calculation performed by intelligent electronic device20, converts it into a signal that can be processed therein, and outputs the converted signal to determination circuit90. In testing device50-4, determination circuit90determines whether or not operation of intelligent electronic device20is normal.

Thus far, the protection control systems according to the embodiments have been described; however, also in a failure waveform recording device or the like, the simulation calculations may be performed in accordance with the characteristic of the CT, the characteristic of the PT, and the characteristic of the MU by utilizing PC60or the like.

REFERENCE SIGNS LIST

1: protection control system;2: power transmission line;6: circuit breaker;7: current transformer;8: potential transformer;10: merging unit;11: isolation transformer;12: analog filter;13: AD conversion circuit;14: data buffer memory circuit;15: process bus IF circuit;16: reception circuit;17: sampling control circuit;18: data reading circuit;19: isolation circuit;20: intelligent electronic device;22: process bus;24: station bus;26: substation automation system device;28: remote monitoring control device;30: remote control center;50: testing device;51: IF circuit;52: data buffer circuit;53: process bus IF circuit;54: setting circuit;55: reception circuit;56: sampling control circuit;57: calculation circuit;58: data buffer memory circuit;60: PC;61: failure calculation unit;62: CT&PT characteristic simulation unit;63: MU characteristic simulation unit;64: data transmission unit;65: device information generation unit;66: TEST-MU transmission setting unit;67: storage unit;68: IED determination value transmission unit;69: IED determination result collection unit;81: output data setting unit;82: sampling setting unit;83: MU characteristic setting unit;84: IED determination value setting unit;90: determination circuit;91: isolation circuit.