JP2003079046A - Protection relay system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome the problem that, conventionally, system's physical quantities (current, voltage, or the like) cannot be fetched out when the protection relay device is failed, since fetch of the system's physical quantities and relay calculation are carried out by the protection relay device. SOLUTION: An input/output device 101 samples the system's physical quantities and converts them to digital ones, and transmits to a corresponding protection relay calculation device 102 via a network 123. The corresponding protection relay calculation device 102 calculates whether or not a system failure occurs by using the transmitted system's physical quantities, and with the result of the calculation, sends out a trip instruction from an output interface 120 to a corresponding circuit breaker (not shown in drawing). Further, the system's physical quantities, which the input/output device 101 sends out, can be fetched out, even at protection relay calculation devices (devices 103 and 104) besides the protection relay calculation device 102 via the network 123. The other devices 103 and 104 can back up, even if the protection relay calculation device 102 is failed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay system, and more particularly, to making a physical quantity of a system available to a plurality of protective relay computing devices via a network.

[0002]

2. Description of the Related Art FIG. 3 shows the configuration of a conventional protective relay device 301. In the figure, 311 is an input converter for taking in the physical quantity (analog data) of the transmission and distribution line, 312 is a filter for extracting the frequency component necessary for the calculation for determining the presence or absence of a system fault, and 313 is obtained from the filter 312. A sample and hold circuit that samples and holds analog data, 314 is a multiplexer, 315 is an analog / digital converter, 316 is a random access memory that stores analog / digital converted data, and other operation data. 317 is various relay operation processes. A microprocessor 318 for performing a settling interface, 31
Reference numeral 9 is an input interface circuit, and 320 is an output interface circuit.

Next, the operation will be described. (1) First, the input converter 311 converts physical quantities such as voltage and current of the transmission and distribution lines into values that can be calculated by the protective relay device. (2) Next, the filter 312 extracts the frequency component necessary for the calculation for determining the presence or absence of a system fault. (3) The sample hold circuit 313 holds the analog data of the physical quantity of the power transmission and distribution line at the sample time.

(4) The multiplexer 314 sequentially sends the data held at the same time to the analog / digital converter 315. (5) The analog / digital converter 315 converts analog data into digital data. (6) The random access memory 316 is used to store the digital data converted by the analog / digital converter 315 and the temporary data of the intermediate result of the relay calculation process.

(7) The microprocessor 317 executes the relay arithmetic processing by looking at the digital data converted by the analog / digital converter 315 and the state of the input interface 319. (8) The result of executing the relay calculation process is output from the output interface 320 to the outside. For example, when it is determined that there is a system fault, a trip command is issued to the circuit breaker for that system. (9) The settling interface 318 interfaces with the operator of the protective relay device.

[0006]

Conventionally, a protective relay device has been used to take in physical quantities (current, voltage, etc.) of a system and to display a locus of the physical quantity at the time of a system fault. Therefore, when the protective relay device fails, it is difficult to obtain the above information. Further, when the circuit breaker is operated by a control command such as a trip signal of the protective relay device, it is difficult to send the trip signal if the protective relay device fails.

The present invention has been made in order to solve the above problems, and the physical quantity of the system input to the protective relay device can be applied to other protective relay devices and other devices. The purpose is to obtain a protective relay system that shares information on the physical quantity of the system (input side information) so that it can be input and used. In addition, even if any protective relay device issues a control command such as a trip signal, etc. It is an object to obtain a protective relay system that shares control command information (output side information) such as a trip command so that a control device such as a circuit breaker can be accessed.

[0008]

(1) A protective relay system according to claim 1 of the present invention comprises an input / output device, a protective relay computing device, and a network interposed between the two.
The input / output device is a device for sampling a physical quantity such as a voltage / current of an electric system to be monitored and controlled, converting it into a digital value, and transmitting the digitized physical quantity of the system to the corresponding protective relay computing device via the network. The corresponding protective relay computing device computes the presence or absence of a system fault using the transmitted physical quantity of the system, and sends a control command to the controlled device corresponding to the electrical system based on the computation result. Even if there is a protective relay computing device connected to the network other than the corresponding protective relay computing device, the protective relay computing device captures the physical quantity of the system transmitted by the input / output device, and determines it. The calculation processing of is possible.

(2) A protective relay system according to a second aspect of the present invention comprises an input / output device, a protective relay computing device, a device to be controlled, and a network interposed between the three, and the input / output device is Is a device that samples physical quantities such as voltage and current of the electrical system to be monitored and controlled, converts them to digital, and transmits the digitized physical quantities of the system to the corresponding protective relay computing device via the network. The protective relay computing device that computes the presence or absence of a system fault using the transmitted physical quantity of the system, and sends a control command to the control target device corresponding to the electrical system via the network based on the computation result. Even if there is a protective relay computing device connected to the network other than the corresponding protective relay computing device, the With entry output device allows a predetermined calculation process takes in physical quantity of the system to be sent is obtained by allowing sends a control instruction to the control target device.

(3) In the protective relay system according to claim 3 of the present invention, in claim 1 or claim 2, the device to be controlled is a circuit breaker, and the control command is a trip signal of the circuit breaker. It is what

(4) A protective relay system according to claim 4 of the present invention is the protective relay system according to any one of claims 1 to 3, which is connected to the network and is a physical quantity of a system on the network. In addition to the above-mentioned protective relay computing device, a device for taking in and performing a predetermined process is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a block diagram of a protective relay system according to Embodiment 1 of the present invention. In FIG. 1, an input converter 101 is an input converter 111 that converts a physical quantity of a transmission and distribution line into a value that can be calculated by a protective relay device, and a filter that extracts a frequency component necessary for a calculation to determine the presence or absence of a system fault. 112, a sample hold circuit 113 for holding analog data of physical quantities of transmission and distribution lines at a sampling time, a multiplexer 114 for time division of a plurality of data, an analog / digital converter 115 for converting analog data into digital data, and a network 123 for data. It is composed of the interface unit 121 for transmitting the information to the above.

The protective relay computing device 102 has an interface section 122 for receiving data from the network 123.
A random access memory 116 used to store the data and temporary data of the intermediate result of the relay arithmetic processing,
Input interface 1 for receiving conditions of power system equipment
19, the state of the random access memory 116 and the input interface 119 is checked, the microprocessor 117 that executes the relay calculation process, the output interface 120 that outputs the result of the relay calculation to the outside, and the interface with the operator of the protective relay device. Settling interface 1
It is composed of 18.

Here, "look at the state of the input interface 119" means that, for example, if there is a sequence process during the relay calculation process as in the conventional case, AND or OR of various external device conditions is included in the sequence process. It is processed by adding conditions such as. In this case, it is necessary to check the state (ON / OFF) of the circuit breaker to trip. Therefore,
"Status" means the status of external equipment (ON / OFF) and the status of external equipment (used / not used) used for the above sequence processing.
Say such.

The devices 103 and 104 may be the same device as the protective relay operation device 102, or may be devices that input and process physical quantities of other systems. For example, DAC
(Digital / analog converter) may return to an analog value and display. In addition, the input conversion device 101,
The protection relay computing device 102 and the devices 103 and 104 are connected by a network 123.

Next, the operation will be described. (1) The input converter 111 of the input converter 101 converts the physical quantity of the transmission and distribution line into a value that can be calculated by the protective relay device. (2) From the converted physical quantity of the system, the filter 112 extracts only the frequency component necessary for the calculation for determining the presence or absence of the system fault. (3) Then, by the sample hold circuit 113,
Holds analog data of physical quantity of transmission and distribution lines at sample time. (4) The held data is converted into digital data by the analog / digital converter 115 via the multiplexer 114 that time-divides a plurality of data.

(5) The converted digital data is transmitted to the network 123 by the interface section 121. (6) Interface unit 12 of protection relay computing device 102
2 receives data from the network 123. (7) The random access memory 116 is used to store the received digital data and temporary data of the intermediate result of the relay calculation process.

(8) The microprocessor 117 receives the received digital data and the input interface 11
The relay arithmetic processing is executed by looking at the state of 9. Here, "to see the state of the input interface 119" means that, for example, if there is a sequence process during the relay calculation process, various external device conditions A are included in the sequence process.
Processing is performed by adding conditions such as ND and OR. In this case, it is necessary to check the state (ON / OFF) of the circuit breaker to trip. Therefore, the state means an external device state (ON / OFF) and an external device setting state (used / not used) used for the above sequence processing.

(9) The result of executing the relay calculation process is
Output from the output interface 120 to the outside. For example, when it is determined that there is a system fault, a trip command is issued to the circuit breaker for that system. (10) The settling interface 118 interfaces with the operator of the protective relay device.

As described in (5) above, the converted digital data is transmitted to the network 123 by the interface unit 121. Therefore, the physical quantity of the system, which is digital data, is on the network to which the devices 103 and 104 are connected. It becomes possible to handle it as shared data. That is, the information necessary for displaying the locus of the physical quantity at the time of a system fault and the current physical quantity of the system is displayed on the other device 103,
It can also be shared with 104. As a result,
Even if the protective relay device 102 fails, the above-mentioned calculation can be performed by using another device, for example, the device 103, as a protective relay calculation device.

Embodiment 2. 2 is a block diagram of a protective relay system according to Embodiment 2 of the present invention. The same reference numerals as those in FIG. 1 represent the same or corresponding parts and will not be described.
In FIG. 2, an input / output control device 205 is a control target device that controls a system such as a circuit breaker.

Next, the operation of the part different from the first embodiment will be described. The calculation result of the microprocessor 117 that executes the relay calculation process is transmitted to the network via the interface unit 122. Then, a control command such as a trip signal is transmitted to the input / output control device 205 connected to the network 123.

As a result, an input interface for receiving the condition of the power system device (corresponding to the input interface 119 for receiving the condition of the power system device shown in FIG. 1), and
The information of the output interface (corresponding to the output interface 120 that outputs the result of the relay calculation shown in FIG. 1 to the outside) that issues a trip command to operate the circuit breaker of the system based on the calculation result is shared with other devices. be able to.

[0024]

As described above, according to claim 1 of the present invention, since at least one input / output device and a plurality of protective relay arithmetic devices are configured as a system through a network, each protective relay is provided. The arithmetic device can individually take in the physical quantity of the system transmitted by the input / output device, that is, can share the information of the physical quantity of the system on the network.

According to the second aspect of the present invention, since at least one input / output device, a plurality of protective relay operation devices, and at least one control target device are configured via a network, the system is protected. The relay computing device can individually take in the physical quantity of the system sent by the input / output device, and can send the control command sent from each protective relay computing device to the controlled device via the network. it can. That is, information on the physical quantity of the system and information on the control command can be shared on the network.

According to the third aspect of the present invention, since the controlled device is the circuit breaker and the control command is the trip signal of the circuit breaker, access to the circuit breaker can be shared.

According to the fourth aspect of the present invention, a device connected to the network is provided, and the device can take in the physical quantity of the system on the network to perform a predetermined process. The physical quantity information of can be shared with devices other than the protective relay computing device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a protective relay system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a protective relay system according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional protective relay device.

[Explanation of symbols]

101 Input Converter 102 Protection Relay Calculator 103 Equipment 104 Equipment 111 Input Converter 112 Filter 113 Sample and Hold Circuit 114 Multiplexer 115 Analog / Digital Converter 116 Random Access Memory 117 Microprocessor 118 Settling Interface 119 Input Interface 120 Output Interface 121 Interface Part 122 interface part 123 network 205 input / output control device (control target device)

Claims (4)

[Claims] 1. An input / output device, a protective relay computing device, and a network interposed between the two, the input / output device sampling physical quantities such as voltage and current of an electric system to be monitored and controlled, and converting them into digital signals. Then, a device for transmitting the digitized physical quantity of the system to the corresponding protective relay computing device via the network, and the corresponding protective relay computing device uses the transmitted physical quantity of the system to detect a system fault. A device that calculates presence / absence and sends a control command to a control target device corresponding to the electric system based on the calculation result, and a protection relay calculation connected to the network other than the corresponding protection relay calculation device. Even if you have a device
A protective relay system capable of performing predetermined arithmetic processing by taking in the physical quantity of the system transmitted by the input / output device by the protective relay arithmetic device. 2. An input / output device, a protective relay computing device, a controlled device, and a network interposed between the above three parties,
The input / output device is a device for sampling a physical quantity such as a voltage / current of an electric system to be monitored and controlled, converting it into a digital value, and transmitting the digitized physical quantity of the system to the corresponding protective relay computing device via the network. The corresponding protective relay computing device computes the presence or absence of a system fault using the transmitted physical quantity of the system, and sends a control command to the controlled device corresponding to the electrical system based on the computation result. Even if there is a protective relay arithmetic device connected to the network other than the corresponding protective relay arithmetic device as a device transmitting via the network, the input / output device transmits by the protective relay arithmetic device. A protective relay system capable of taking in a physical quantity of a system and performing predetermined arithmetic processing, and also capable of sending a control command to the above-mentioned controlled device. 3. The protective relay system according to claim 1, wherein the device to be controlled is a circuit breaker, and the control command is a trip signal of the circuit breaker. 4. The protective relay system according to any one of claims 1 to 3, wherein a device which is connected to the network and takes in a physical quantity of a system on the network to perform a predetermined process is used for the protective relay calculation. A protective relay system provided separately from the device.