JP2009027909A - Current differential relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current differential relay rapidly obtaining various kinds of data on the other current differential relay. <P>SOLUTION: The current differential relay is mounted at every point of protecting sections on a power cable L; and performs each of transmission for sampling current data at the own side 101 in the power cable L to the other side 102, and reception for the sampling current data at the other side 102 in the power cable L, through a transmission line with a transmitting rate over 2,048 kbps. At the same time, the relay transmits the data associated with a representation from HMI unit 9 possible to transmit and receive the information along with the presence of representing unit 103, with the help of the rest of a region in a transmission frame with these sampling data listed thereon. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is provided at each end of the protection section of the transmission line, and transmits the sampling current data of the own end flowing through the transmission line to the other end via a predetermined transmission line, and the sampling current of the other end flowing through the transmission line. Relating to a current differential relay that receives data via the transmission line and finds the difference between the sampling current data detected by its own end and the sampling current data transmitted from the other end to detect an accident in the protection zone It is.

  In the current differential relay having such a configuration, regarding data transmission between the current differential relays, the own device and the counterpart device sample each phase current data at a cycle of 30 °, and the sampling current data is transmitted at a transmission rate of 54 kbps. (Or 64 kbps) transmission and reception between each other. Then, a difference current value is calculated from the sampling current data of the own device and the sampling current data of the counterpart device, and an accident is determined when the difference current value exceeds a predetermined value. In addition, ON / OFF information (positive and negative information) of the current differential relay is placed in the vacant bit of the transmission information to determine whether there is a transmission abnormality on the receiving side or to determine device operation information such as a protection device. (For example, refer to Patent Document 1). This method is suitable when the presence / absence of transmission abnormality and apparatus operation state determination are performed as described in Patent Document 1.

Japanese Patent Laying-Open No. 2005-176440 (FIG. 3A)

  However, the conventional transmission method as described in the above-mentioned Patent Document 1 can be applied to determine whether there is a transmission abnormality or to determine the state of device operation. It is not suitable for data acquisition when performing failure analysis or maintenance of relays. Conventionally, when the current differential relay is operated, the data of the counterpart device can be obtained and analyzed by going to the installation location of the counterpart device and acquiring the data directly from the device, or remote communication to each substation It was necessary to provide a simple monitoring control system and a connection interface with the relay.

  As described above, in the current differential relay, for the purpose of performing the analysis at the time of relay operation, in order to obtain the set value of the counterpart device, the state of the relay element, and the device input / output signal, from the own device every time an accident occurs. It is necessary to go to the location of the partner device several tens of kilometers away, or to install a special monitoring and control system in advance. It takes a lot of time to analyze the data and take appropriate measures. There was a problem of becoming necessary.

  The present invention has been made to solve the above-described problems. The low-speed transmission line used conventionally for the purpose of transmitting sampling current data is replaced with a higher-speed transmission line, and the conversion is performed. By effectively transmitting various data using the free space on the transmission line, the counterpart current differential relay can be quickly performed without moving to the installation location of the counterpart device and without the need for a special monitoring control system. An object of the present invention is to provide a current differential relay capable of obtaining various data.

  In order to solve the above-described problems and achieve the object, the current differential relay of the present invention is installed at each end of the protection section of the transmission line, and the predetermined sampling current data flowing through the transmission line is transmitted in a predetermined manner. A transmission data processing unit for performing transmission processing to be transmitted to the other end via the path and reception processing for receiving sampling current data of the other end flowing through the transmission line via the transmission path, and sampling detected by the own end A differential operation unit that calculates a difference current between the current data and the sampling current data transmitted from the other end, and a current difference that detects the presence or absence of an accident in the protection section based on the calculated difference current A dynamic relay is provided with a human-machine interface unit that enables information exchange with a display device interposed therebetween, and the transmission path has a transmission speed of 2048 kbps or higher. The transmission data processing unit transmits the sampling current data on a transmission frame used in the transmission path, and the remaining area of the transmission frame on which the sampling current data is mounted The display-related data transmitted from the human-machine interface unit is transmitted by using the function.

  According to the present invention, since various transmission data (display related data) other than the sampling current data is transmitted on the transmission frame for transmitting the sampling current data, a special monitoring control system or the like is newly provided. Without moving to the installation location of the counterpart device, various data of the relay installed at the counterpart end can be obtained quickly from the relay installed at one substation, improving the analysis function during relay operation There is an effect.

  Embodiments of a current differential relay according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a system configuration diagram of a first embodiment of a current differential relay according to the present invention. In FIG. 1, two current differential relays are respectively installed at both ends of the protection section of the transmission line L and connected to the transmission line L. Among these current differential relays, the first current differential relay 101 is connected to one end of the protection section of the transmission line L, and the output signal of the first current differential relay 101 is connected via the contact 11. The circuit breaker 7 is connected to the power transmission line. The second current differential relay 102 connected to the other end side of the protection section of the transmission line L also has the same configuration as the first current differential relay 101. The first current differential relay 101 is connected to the power transmission line L via a current transformer (CT) 2 provided in the power transmission line L. Similarly to the first current differential relay 101, the second current differential relay 102 is connected to the power transmission line L via the CT 2 and the circuit breaker 7, and the output signal of the second current differential relay 102 is a contact ( It is connected to the circuit breaker 7 installed in the power transmission line L via a not-shown.

  The first current differential relay 101 includes a filter 3, a sampling hold circuit 4, an A / D converter 5, a differential operation unit (operation unit) 8, a human machine interface (HMI) unit 9, and a common unit 10. , Contact point 11, transmission data processing unit 12, sampling synchronization control processing unit 13, and optical interface (I / F) unit 14.

  Next, the operation of the current differential relay will be described. Sampling current data input from the power transmission line L to the first current differential relay 101 through the CT 2 passes through the filter 3, the sampling hold circuit 4, the A / D converter 5, and the transmission data processing unit 12 into a predetermined transmission frame. After that, the data is loaded, and then passed through the optical I / F unit 14, the optical fiber 15, the O / E (optical / electrical signal converter) 17, the cable 19, the multiplexing converter 16 and the transmission path (optical fiber) 20. Transmitted to the second current differential relay 102.

  On the other hand, sampling current data detected by the second current differential relay 102 and received by the multiplex conversion device 16 via the optical fiber 20 includes a cable 19, an E / O (electrical / optical signal converter) 18, and an optical fiber 15. The data is input to the transmission data processing unit 12 via the optical I / F unit 14. The differential operation unit 8 calculates the input sampling current data, that is, the difference current between the sampling currents detected by the first current differential relay 101 and the second current differential relay 102, and the difference current value is predetermined. If the value is exceeded, an accident is determined and a signal to that effect is transmitted to the circuit breaker 7 via the contact 11. The circuit breaker 7 receives this signal and interrupts the current flowing through the transmission line L.

  Further, the HMI unit 9 inputs the transmission data from the second current differential relay 102 taken in via the transmission data processing unit 12 (as indicated by an arrow A in FIG. 1) and displays the data among them. Relevant data is extracted and displayed on the screen of the LCD unit 24 of the front panel 23 or the personal computer (PC) 21 in the display unit 103. That is, the HMI unit 9 constitutes a human machine interface unit that performs display on a display unit such as the front panel 23 or the PC 21. Further, the HMI unit 9 converts the command information based on the operation input of the push button 22 of the front panel 23 or the operation input of the PC 21 (as indicated by an arrow B in FIG. 1) to transmission information (converted into a predetermined transmission frame format). To the second current differential relay 102. Note that the second current differential relay 102 also has the same display unit 103 as the first current differential relay 101.

  2 to 5 are diagrams showing examples of transmission data according to the present embodiment. FIGS. 2 and 4 are transmissions transmitted from the first current differential relay 101 to the second current differential relay 102, for example. An example of data is shown, and FIG. 3 and FIG. 5 show an example of transmission data transmitted from the second current differential relay 102 to the first current differential relay 101.

  In FIG. 2, transmission data S-1 transmitted from the first current differential relay 101 to the second current differential relay 102 includes frame synchronization, A phase current data and B phase current data which are part of sampling current data. , C-phase current data, predetermined control data, and CRC. This data string is assigned to a predetermined CH, and ITU-T G. It is transmitted toward the second current differential relay 102 in accordance with the frame format 704.

  In FIG. 3, transmission data R-1 transmitted from the second current differential relay 102 to the first current differential relay 101 includes frame synchronization, A phase current data and B phase current data which are part of sampling current data. , C-phase current data, predetermined control data, and CRC. This data string is assigned to a predetermined CH, and ITU-T G. It is transmitted toward the first current differential relay 101 in accordance with the frame format 704. That is, it has the same configuration as the transmission data S-1.

  The transmission data S-1 and the transmission data R-1 are sampling current data performed at the same electrical angle of 30 ° as in the prior art, and are always mutually exchanged between the first current differential relay 101 and the second current differential relay 102. Has been sent to. In this embodiment, this sampling current data is transmitted using a 2048 kbps transmission line instead of the conventional 54 kbps or 64 kbps transmission line.

Here, ITU-TG A transmission frame format based on the 704 standard will be briefly described. FIG. 12 shows ITU-T G. 2 is a diagram illustrating a transmission frame format based on the standard of 704. FIG. As shown in the figure, in this transmission frame format, one frame length of 256 bits is transmitted in a time of 125 μs. For this reason, the transmission rate of this transmission frame is 256 / (125 × 10 ⁻⁶ ) = 2048 kbps. Further, in this transmission frame format, one frame has an area (channel) divided into 32, and 256/32 = 8-bit data is placed on these 32 divided channels. Of these 32 channels, a channel consisting of CH1 to CH30 is an area where data can be mounted. The sampling current data is transmitted on a predetermined channel in these data mountable areas (CH1 to CH30).

  In FIG. 4, transmission data S-3 transmitted from the first current differential relay 101 to the second current differential relay 102 is one of display-related data (transmission data), and the counterpart current difference This is HMI command data (setting value transmission request) requesting transmission of a setting value of a dynamic relay. The HMI command data (setting value transmission request) is transmitted by the HMI unit 9 on the transmission information of its own device, triggered by a predetermined operation input by the push button 22 of the front panel 23.

  In FIG. 5, transmission data R-3 and transmission data R-4 transmitted from the second current differential relay 102 to the first current differential relay 101 are the first received the HMI command data (setting value transmission request). The HMI unit 9 of the two-current differential relay 102 is a settling value transmitted as an answer, for example, HMI response data (settling value) as one of display related data.

  The transmission data S-3 and the transmission data R-3 and R-4, which are display-related data, are transmitted using a region where the sampling current data is not placed (the remaining part of the transmission frame format). In addition, since this type of settling value has a large amount of information, the present embodiment shows an example of transmission using a plurality of data blocks.

  As described above, in the current differential relay of the present embodiment, an ITU as shown in FIG. 12 is transmitted on a 2048 kbps transmission line using a 2048 kbps transmission data processing unit instead of the conventional 64 kbps. -TG. For example, HMI command data (settling value transmission request) and HMI response data are transmitted on the transmission frame format based on the 704 standard, and sampling current data is always transmitted mutually, and the remaining area of the transmission frame format is used. Since display related data such as (setting value) is transmitted and received, sampling current data and display related data can be transmitted and received simultaneously.

  As described above, according to the current differential relay of the present embodiment, display related data (transmission data) other than the sampling current data is transmitted on the transmission frame for transmitting the sampling current data. The display-related data of the counterpart terminal relay can be obtained quickly without installing a special monitoring control system or the like and without moving to the installation location of the counterpart device, and the analysis function can be improved.

  The first current differential relay 101 and the second current differential relay 102 of the present embodiment include an optical fiber 15, an O / E (light / electric signal converter) 17, and an E / O (electricity / light signal). Converter) 18, cable 19, multiplex conversion device 16, and optical fiber 20 are connected as transmission lines, but the transmission line connecting the first current differential relay 101 and the second current differential relay 102 is The optical fiber 15, the O / E (light, electrical signal converter) 17, the E / O (electrical, optical signal converter) 18, the cable 19, the multiple conversion device 16, and the optical fiber 20 are not limited, for example The optical I / F unit 14 and the optical fiber 20 may be directly connected.

  Further, the transmission data S-3 and the transmission data R-3 and R-4 of the present embodiment are other than the sampling current data of the transmission frame format shown in FIG. 12 being mounted in synchronization with the transmission of the sampling current data. It is sent on the remaining part of the message. However, the transmission data S-3 and the transmission data R-3 and R-4, which are display related data, are independently transmitted in the transmission frame format of FIG. 12 without being synchronized with the transmission of the sampling current data. May be.

  In the present embodiment, the sampling current data and the display related data have been described as being transmitted using a transmission line having a transmission rate of 2048 kbps. However, it is needless to say that a transmission line having a transmission rate exceeding 2048 kbps may be used. It is.

Embodiment 2. FIG.
6 and 7 are diagrams showing examples of transmission data according to the second embodiment. FIG. 6 shows an example of transmission data transmitted from the first current differential relay to the second current differential relay, for example. 7 shows an example of transmission data transmitted from the second current differential relay to the first current differential relay.

  In FIG. 6, transmission data S-4 transmitted from the first current differential relay to the second current differential relay is one of display-related data, and requests transmission of the event log of the counterpart current differential relay. HMI command data (event log transmission request). Specifically, the transmission data S-4 is configured by the type (Kind) of the HMI command data. This HMI command data (event log transmission request) is transmitted by the HMI unit 9 on the transmission information of its own device, triggered by the operation of the push button 22 of the front panel 23 or the operation input of the PC 21.

  In FIG. 7, transmission data R-5, transmission data R-6, and transmission data R-7 transmitted from the second current differential relay to the first current differential relay are the HMI command data (event log transmission request). HMI response data (event log) as one of display-related data, in which the HMI unit 9 of the second current differential relay that has received () transmits an event log as a response. The amount of information varies depending on the log collection time, and the event log is transmitted using the number of data blocks (channels) according to the amount of information (three in this embodiment). More specifically, the transmission data R-5, the transmission data R-6, and the transmission data R-7 are classified into the HMI command data type (Kind) and the event No. (EvtNo.) And event occurrence time.

  In the transmission data S-4, the transmission data R-5, the transmission data R-6, and the transmission data R-7, as in the display-related data in the first embodiment, the first current differential relay is always connected. It is transmitted using the remaining area of the transmission frame format for transmitting the sampling current data being transmitted. Alternatively, it is transmitted alone in the transmission frame format.

  As described above, according to the current differential relay of the present embodiment, display related data (transmission data) other than the sampling current data, that is, the event log transmission request and the sampling current data are placed on the transmission frame for transmitting the sampling current data. Since the event log is transmitted, the event log of the partner device can be obtained quickly without newly installing a special monitoring control system, etc., and without moving to the installation location of the partner device, improving the analysis function be able to.

Embodiment 3 FIG.
As described above, in the first and second embodiments, the command information by the operation of the push button 22 of the front panel 23 or the operation of the PC 21 and the response value, the set value and the event log information are 2048 kbps shown in FIG. They are transmitted and received in a transmission frame format and displayed on a display device.

  In the present embodiment, the relay element status and device input / output signal information are mutually transmitted and received in the 2048 kbps transmission frame format shown in FIG. The state of the relay element and the information on the device input / output signal are transmitted and then stored in the counterpart self-current differential relay. The state of the relay element and the information of the device input / output signal can be confirmed by the front panel 23 or the push button 22 as necessary.

  As described above, the state of the relay element of the counterpart device and the information of the device input / output signal can be stored and displayed as necessary, so that the analysis function of the relay operation at the time of detecting an accident can be improved.

Embodiment 4 FIG.
In the fourth embodiment, information of measurement value (voltage, current, phase, active power, reactive power, power factor, differential current, suppression current, etc.) is displayed as command information and response information of the HMI unit 9. 12 are transmitted and received with each other in the transmission frame format of 2048 kbps shown in FIG.

  With this configuration, the measurement value information of the counterpart current differential relay can be displayed as necessary, so that it is easy to grasp the state of the system.

Embodiment 5 FIG.
In the fifth embodiment, software version information is transmitted / received to / from the transmission frame format of 2048 kbps shown in FIG. 12 and displayed as command information and response information of the HMI unit 9.

  With this configuration, the software version information of the counterpart current differential relay can be displayed as necessary, which is convenient for managing the system.

Embodiment 6 FIG.
In the sixth embodiment, the set value of the counterpart current differential relay is set by operating the push button 22 on the front panel 23 or operating the PC 21. In FIG. 8, transmission data S-5 and S-6 transmitted from the first current differential relay to the second current differential relay are one of display-related data, and are transmitted to the counterpart current differential relay. This is HMI command data (setting value setting request) for requesting setting of a setting value. Specifically, the transmission data S-5 and S-6 are composed of the type (Kind) of the HMI command data, and the set values of the respective items that follow this. The HMI command data (setting value setting request) is transmitted by the HMI unit 9 taking in the data input from the PC 21.

  In FIG. 9, transmission data R-8 transmitted from the second current differential relay to the first current differential relay is the transmission current R-8 of the second current differential relay that has received the HMI command data (setting value setting request). This is HMI response data (setting value setting result) as one of display-related data, in which the HMI unit 9 sets a setting value accordingly and then transmits the setting result as an answer. More specifically, the transmission data R-8 includes the type (Kind) of the HMI response data and the setting result of the subsequent set value. The HMI unit 9 receives the HMI response data (setting value setting result) and displays the setting value setting result on the PC 21.

  As described above, according to the current differential relay of the present embodiment, the set value is transmitted on the transmission frame for transmitting the sampling current data, the set value setting request is transmitted, and the set value of the counterpart device is set. Without setting up a special communication medium, the set value of the counterpart device can be set quickly without moving to the installation location of the counterpart device, thereby facilitating system operation.

Embodiment 7. FIG.
FIG. 10 is a system configuration diagram of a seventh embodiment of the current differential relay according to the present invention. The common part (first time synchronization means) 10 of the first current differential relay 101 is connected to a GPS receiver 51 that receives time information from the GPS satellite 50. The common unit 10 inputs time information from the GPS satellite 50 and performs a process of synchronizing the system time of the own device with the GPS time. Further, the common unit 10 places the received time information on the transmission information (as indicated by an arrow C in FIG. 10) and transmits it to the second current differential relay 102 which is the counterpart device. Thereby, the common part (second time synchronization means: not shown) of the second current differential relay 102 performs the time synchronization processing based on this time information.

  In FIG. 11, transmission data S-7 and S-8 transmitted from the first current differential relay 101 to the second current differential relay 102 are HMI commands that request time synchronization processing of the counterpart current differential relay. Data (time information). Specifically, the transmission data S-7 includes the type (Kind) of the HMI command data, followed by time 1 (integrated seconds: L), time 2 (integrated seconds: H), and time 3 (μ seconds: L). , Time 4 (μ seconds: H). The transmission data S-8 is composed of the type (Kind) of the HMI command data, followed by time 5 (flag and others).

  In the present embodiment, the time synchronization process is performed using the time information acquired from the GPS receiver 51. However, the time information acquired from other than the GPS receiver 51 may be used. Time information such as a station or a radio clock, or time information input from the front panel 23 or the PC 21 may be used.

  As described above, according to the current differential relay of the present embodiment, the time information for performing time synchronization is transmitted to the counterpart device on the transmission frame for transmitting the sampling current data. Time synchronization processing between the differential relay and the second current differential relay can be easily performed.

  As described above, the current differential relay according to the present invention is provided with the current differential relays at both ends of the protection section of the transmission line, and the respective current differential relays are connected to each other via the transmission path. The relay is useful when applied to a current differential relay that transmits the sampling current data of the transmission line to each other through the transmission line to determine the difference current between the sampling currents and detect an accident in the protection zone. The current differential relay of the counterpart device is optimal for a current differential relay that is in a difficult place to go.

1 is a system configuration diagram of a first embodiment of a current differential relay according to the present invention; FIG. It is a figure which shows the transmission frame of the sampling current data transmitted from a 1st current differential relay to a 2nd current differential relay. It is a figure which shows the transmission frame of the sampling current data transmitted to a 1st current differential relay from a 2nd current differential relay. FIG. 6 is a diagram illustrating a transmission frame of HMI command data (setting value transmission request) transmitted from the first current differential relay to the second current differential relay of the first embodiment. 6 is a diagram illustrating a transmission frame of HMI response data (settling value) transmitted from the second current differential relay of the first embodiment to the first current differential relay. FIG. It is a figure which shows the transmission frame of the HMI command data (event log transmission request) transmitted from the 1st current differential relay of Embodiment 2 to the 2nd current differential relay. It is a figure which shows the transmission frame of the HMI response data (event log) transmitted from the 2nd current differential relay of Embodiment 2 to a 1st current differential relay. FIG. 18 is a diagram showing a transmission frame of HMI command data (setting value setting request) transmitted from the first current differential relay to the second current differential relay of the sixth embodiment. FIG. 20 is a diagram illustrating a transmission frame of HMI response data (set value setting result) transmitted from the second current differential relay to the first current differential relay of the sixth embodiment. These are the system block diagrams of Embodiment 7 of the current differential relay concerning this invention. FIG. 20 is a diagram illustrating a transmission frame of HMI command data (time information) transmitted from the first current differential relay to the second current differential relay according to the seventh embodiment. ITU-T G. 2 is a diagram illustrating a transmission frame format based on the standard of 704. FIG.

Explanation of symbols

2 Current transformer (CT)
3 Filter 4 Sampling Hold Circuit 5 A / D Converter 7 Circuit Breaker 8 Differential Operation Unit (Calculation Unit)
9 Human Machine Interface (HMI) part 10 Common part (first time synchronization part)
11 Contact 12 Transmission Data Processing Unit 13 Sampling Synchronization Control Processing Unit 14 Optical Interface (I / F) Unit 15 Optical Fiber 16 Multiplexer 17 O / E (Optical / Electric Signal Converter)
18 E / O (electrical, optical signal converter)
19 Cable 20 Optical fiber 21 Personal computer (PC)
22 push button 23 front panel 24 LCD unit 101 first current differential relay 102 second current differential relay 103 display unit

Claims (9)

Transmission processing that is installed at each end of the protection section of the transmission line and that transmits the sampling current data of the own end flowing through the transmission line to the other end via a predetermined transmission line, and the sampling current data of the other end flowing through the transmission line A transmission data processing unit that performs each of the reception processes for receiving the signal via the transmission line, and a differential calculation unit that calculates a difference current between the sampling current data detected by the local end and the sampling current data transmitted from the counterpart end And a current differential relay that detects the presence or absence of an accident in the protection section based on the calculated difference current,
A human-machine interface unit that enables information exchange via a display device is provided, and the transmission path is configured as a transmission path having a transmission speed of 2048 kbps or higher.
The transmission data processing unit transmits the sampling current data on a transmission frame used in the transmission path, and utilizes the remaining area of the transmission frame on which the sampling current data is mounted to the human machine. -A current differential relay characterized by transmitting display-related data transmitted from the interface. The display related data is:
A set value transmission request transmitted from the human machine interface unit at its own end;
A settling value transmitted from the human machine interface at the other end as a response signal of the settling value transmission request;
The current differential relay according to claim 1, comprising: The display related data is:
An event log transmission request transmitted from the human machine interface unit at its own end;
An event log transmitted from the human machine interface at the other end as a response signal of the event log transmission request;
The current differential relay according to claim 1 or 2, characterized by comprising:   4. The current differential relay according to claim 1, wherein the display-related data includes a state of a relay element and a device input / output signal transmitted from the human-machine interface unit. 5. .   5. The current differential relay according to claim 1, wherein the display related data includes measurement value information transmitted from the human machine interface unit. 6.   6. The current differential relay according to claim 1, wherein the display related data includes software version information transmitted from the human machine interface unit. The display related data is:
A setting value setting request transmitted from the human machine interface unit;
The set value setting result transmitted from the human machine interface unit at the other end that has received the set value setting request;
The current differential relay according to claim 1, comprising: A time synchronization unit that synchronizes the local time with the GPS time received from the GPS receiver;
8. The current differential relay according to claim 1, wherein time information from the time synchronization unit is included in data transmitted to the other end as the display-related data. 9. A time synchronization unit that synchronizes its own time based on time information on which time synchronization processing based on GPS time is performed;
The current differential relay according to claim 1, wherein the time information is included in data received by the terminal as the display related data.

Images