JP6689220B2 - Protective relay - Google Patents

Description

  Embodiments of the present invention relate to a protective relay device.

  The power system in which the power from the power plant is supplied to the customers is provided with circuit breakers for protecting various places. The circuit breaker is controlled by a protective relay that monitors the power corresponding to the circuit breaker. In such a protective relay device, reliability of control for the circuit breaker is required.

Japanese Patent No. 3938159

  The problem to be solved by the present invention is to provide a protective relay device capable of improving the reliability of control for a circuit breaker.

  The protective relay device according to the embodiment includes a first AD conversion unit, a first processing unit, a second AD conversion unit, a second processing unit, and a selection unit. The protective relay device controls a circuit breaker provided in the power transmission facility. The first AD conversion unit converts the analog information regarding the electric power measured by the measurement unit provided in the power transmission equipment into the first digital information. The first processing unit generates first control information for the circuit breaker provided in the power transmission equipment, based on the first digital information converted by the first AD conversion unit. The second AD converter converts the analog information about the power measured by the measuring unit into second digital information. The second processing unit generates second control information for the circuit breaker based on the second digital information converted by the second AD conversion unit. When both the first control information and the second control information are control information for breaking the circuit breaker, the selection unit outputs control information for instructing the circuit breaker to the circuit breaker.

The block diagram of the power grid system 1 in which the protective relay 10 of 1st Embodiment is used. The block diagram of the protective relay device 10 of 1st Embodiment. 6 is a flowchart showing an example of the flow of processing executed by the control unit 106 to verify the validity of the first digital information D1. The block diagram which shows 10 A of protective relay apparatuses of 2nd Embodiment. The flowchart which shows the flow of the process which the control part 106 of 10 A of protection relay apparatuses of 2nd Embodiment performs. The block diagram which shows the protection relay apparatus 10B of 3rd Embodiment.

  Hereinafter, the protective relay device 10 (10A, 10B) of the embodiment will be described with reference to the drawings.

(First embodiment)
First, the first embodiment will be described. FIG. 1 is a system configuration diagram of an electric power system in which the protective relay device 10 according to the first embodiment is used. The power system 1 includes, for example, a power generator 2, a transformer 3, a circuit breaker 4 (denoted as “CB” in FIG. 1), and a plurality of instrument shifters 5 (an example of a measuring unit) (in FIG. (Described as “CT / VT”) and the power transmission line SL. The power system 1 supplies the power generated by the power generator 2 to the power receiving facility 50 of the customer.

  The power generation device 2 generates power by thermal power, hydraulic power, nuclear power, or the like. The electric power generated by the power generation device 2 is transmitted via the power transmission line SL. Generally, in order to suppress path loss, high voltage power (for example, 275 [kV] or 500 [kV]) is generated near a place where a power receiving facility for a customer is installed from a mountain area where the power generation device 2 is located. Is transmitted up to. The transformer 3 converts the electric power transmitted to the vicinity of the customer into a voltage suitable for the power receiving facility 50 of the customer.

  The power transmission line SL constitutes a part of power transmission equipment. Further, the electric power transmitted through the power transmission line SL is, for example, three-phase alternating current. The power transmission line SL includes three power lines for transmitting each phase (U, V, W) of the three-phase AC power, and transmits the power of each phase.

  The circuit breaker 4 is provided on the power transmission line SL. In the example of FIG. 1, the circuit breaker 4 is provided between the transformer device 3 and the power receiving facility. The circuit breaker 4 is provided for each phase of three-phase alternating current, for example. The circuit breaker 4, based on the control information from the protective relay device 10, may set the position where the circuit breaker 4 is installed in the transmission line for each phase or for three phases to be in the interrupted state or the energized state. it can. When the circuit breaker 4 is in the cutoff state, power is not supplied to the equipment on the downstream side from the place where the circuit breaker 4 is installed in the power transmission line. On the other hand, when the circuit breaker 4 is energized, electric power is supplied to the facility on the downstream side from the place where the circuit breaker 4 is installed in the power transmission line.

  The meter-transforming device 5 acquires a voltage value and a current value in the vicinity of the breaker 4 of the power transmission line SL, and outputs information indicating the acquired voltage value and the current value to the protective relay device 10. . The meter-transforming device 5 measures the voltage of the electric power at the location corresponding to the circuit breaker 4 by stepping it down by a meter transformer (not shown). This is because the voltage of the electric power transmitted through the power transmission line SL is generally too large to be measured as it is. Further, the meter-transforming device 5 performs measurement by converting the electric current of the electric power at the location corresponding to the circuit breaker 4 into a small current by means of an instrument current transformer (not shown). This is because, in general, the current of the electric power transmitted through the power transmission line SL is so large that it is not suitable for measurement as it is, as in the case of the voltage. The voltage value and the current value as the analog information acquired by the meter-transforming device 5 are an example of “analog information regarding electric power”, and are simply referred to as analog information below.

  The protective relay device 10 is a digital protective relay device that controls the circuit breaker 4. The protective relay device 10 includes a main processing unit 100 (an example of a first processing unit), a fail-safe processing unit 200 (an example of a second processing unit), and a selection unit 300. To the protective relay device 10, the analog information from the instrument transformer device 5 is input. The analog information is input to the main processing unit 100 and the fail-safe processing unit 200, respectively. Further, from the protective relay device 10, control information for controlling the circuit breaker 4 is output to the circuit breaker 4.

  The main processing unit 100 uses the analog information to generate first output information (an example of first control information) for controlling the circuit breaker 4, and outputs the first output information to the selection unit 300. The fail-safe processing unit 200 also uses the analog information to generate second output information (an example of second control information) for controlling the circuit breaker 4, and outputs the second output information to the selection unit 300. When both the first output information output by the main processing unit 100 and the second output information output by the fail-safe processing unit 200 are information for interrupting the circuit breaker 4, the selecting unit 300 instructs the circuit breaker to shut off. It has a circuit configuration for outputting information to the circuit breaker 4.

  FIG. 2 is a configuration diagram of the protective relay device 10 according to the first embodiment. As illustrated in FIG. 2, the main processing unit 100 includes, for example, an input conversion unit 101, an AD (Analog-Digital) conversion unit 102 (an example of a first AD conversion unit), a main relay calculation unit 103, and an output unit 104 (first). It has an output unit), a communication unit 105 (an example of a first communication unit), and a control unit 106. The fail-safe processing unit 200 is, for example, an input conversion unit 201, an AD conversion unit 202 (an example of a second AD conversion unit), a fail-safe relay calculation unit 203, an output unit 204 (an example of a second output unit), and a communication unit 205. (An example of the second communication unit). The selection unit 300 includes a switch 301 and a switch 302. The combination of the main relay calculation unit 103 and the control unit 106 is an example of the “first control information generation unit”. Further, the combination of the fail-safe relay calculation unit 203 and the control unit 206 is an example of the “second control information generation unit”.

  The input conversion unit 101 includes a plurality of input terminals to which a plurality of types of analog information from the instrument transformer 5 are respectively input. The input conversion unit 101 converts the voltage of the analog information input to the input terminal into a voltage suitable for the protective relay device 10, and outputs one piece of analog information of the plurality of pieces of analog information to the AD conversion unit 102. The input conversion unit 101 alternately outputs, for example, the voltage value and the current value input from the meter-transforming device 5 to the AD conversion unit 102 at regular time intervals. The AD conversion unit 102 holds the analog information from the input conversion unit 101 at regular time intervals and converts the held analog information into the first digital information D1. The AD conversion unit 102 outputs the first digital information D1 to the main relay calculation unit 103. Further, the AD conversion unit 102 outputs the first digital information D1 to the communication unit 105.

  The main relay calculation unit 103 performs a calculation based on the first digital information D1 from the AD conversion unit 102 and outputs a first calculation result F1 which is control information for the circuit breaker 4. For example, the main relay calculation unit 103 compares the current value input from the AD conversion unit 102 and the current value input from the AD conversion unit 102 in the past for each sampling cycle. Then, when the difference between the compared current values is equal to or larger than the preset range, the main relay calculation unit 103 outputs the first calculation result F1 that brings the circuit breaker 4 into the cutoff state. The main relay computing unit 103 may perform the computation by using the voltage value in addition to or instead of the current value. The main relay calculation unit 103 outputs the first calculation result F1 to the output unit 104. The output unit 104 outputs the first calculation result F1 generated by the main relay calculation unit 103 to the selection unit 300 as the first output information OUT1.

  The communication unit 105 communicates with the communication unit 205 of the failsafe processing unit 200. The communication between the communication units 105 and 205 may be performed by wireless communication such as a specific low power radio station in the 400 [MHz] band or a low power data communication system in the 2.4 [GHz] band. However, wired communication may be performed using an optical fiber cable or the like. Wireless communication or wired communication using an optical fiber cable is used for communication between the communication units 105 and 205 to insulate the circuit of the main processing unit 100 from the circuit of the fail-safe processing unit 200. Therefore, the safety of the protective relay device 10 can be improved. In addition, since the wireless communication is used for the communication between the communication units 105 and 205, the number of wires in the circuit of the main processing unit 100 and the circuit of the fail-safe processing unit 200 can be reduced, and a plurality of wires can be provided. The communication between the circuits becomes easy.

  The communication unit 105 receives the second digital information D2 converted by the AD conversion unit 202 from the communication unit 205. The communication unit 105 outputs the received second digital information D2 to the control unit 106.

  The communication unit 205 receives the first digital information D1 converted by the AD conversion unit 102 from the communication unit 105. The communication unit 205 outputs the received first digital information D1 to the control unit 206.

  The control unit 106 controls the input conversion unit 101, the AD conversion unit 102, the main relay calculation unit 103, the output unit 104, and the communication unit 105.

  The control unit 106 also verifies the validity of the first digital information D1 converted by the AD conversion unit 102. For example, the control unit 106 compares the information corresponding to one cycle in the current value converted by the AD conversion unit 102 with the information corresponding to one cycle in the current value input from the AD conversion unit 102 in the past. Then, as a result of the comparison, for example, when the waveform of one cycle in the current value converted by the AD conversion unit 102 is distorted, the control unit 106 causes the first digital unit to operate due to some trouble in the AD conversion unit 102. It is determined that the information D1 is not normal. Further, the control unit 106 compares the current value converted by the AD conversion unit 102 with the current value converted by the AD conversion unit 202 of the fail-safe processing unit 200 received from the communication unit 105. Then, as a result of the comparison, for example, when the amplitude is attenuated by the current value converted by the AD conversion unit 102, the control unit 106 determines that the first digital information D1 is not normal. In this way, the control unit 106 uses at least one of the first digital information D1 converted by the AD conversion unit 102 and the second digital information D2 acquired by the communication unit 105 from the communication unit 205, and 1 Verify the validity of the digital information D1.

  Then, when the control unit 106 verifies the validity of the first digital information D1 and determines that the first digital information D1 output by the AD conversion unit 102 is not normal, the control unit 106 informs the main relay arithmetic unit 103 and the communication unit 105. The second digital information D2 acquired from the communication unit 205 is input. As a result, the control unit 106 causes the main relay calculation unit 103 to perform calculation based on the second digital information D2, and causes the output unit 104 to output the first calculation result F1 that is control information for the circuit breaker 4.

  The control unit 206 controls the input conversion unit 201, the AD conversion unit 202, the fail-safe relay calculation unit 203, the output unit 204, and the communication unit 205.

  In addition, the control unit 206 uses at least one of the second digital information D2 converted by the AD conversion unit 202 and the first digital information D1 acquired from the communication unit 105 by the communication unit 205, and then uses the second digital information. The validity of the information D2 is verified.

  Then, when the control unit 206 verifies the validity of the second digital information D2 and determines that the second digital information D2 output by the AD conversion unit 202 is not normal, the control unit 206 informs the fail-safe relay calculation unit 203 of the communication unit. The first digital information D1 acquired from the communication unit 105 by 205 is input. As a result, the control unit 206 causes the fail-safe relay calculation unit 203 to perform calculation based on the first digital information D1, and causes the output unit 204 to output the second calculation result F2 that is control information for the circuit breaker 4.

  The input conversion unit 201 has the same configuration as the input conversion unit 101, the AD conversion unit 202 has the same function as the AD conversion unit 102, and the fail-safe relay calculation unit 203 and the main relay calculation unit 103. Since the output unit 204 has a function similar to that of the output unit 104 and the output unit 104 has a function similar to that of the output unit 104, a description thereof will be omitted.

  The switch 301 establishes a connection state or an open state between the voltage Vh and the switch 302. The first output information output from the output unit 104 is input to the control terminal of the switch 301. When the first output information output from the output unit 104 is a signal indicating the cutoff state, the switch 301 is in the connection state. The switch 302 establishes a connection state or an open state between the switch 301 and the circuit breaker 4. The second output information output from the output unit 204 is input to the control terminal of the switch 302. When the second output information output from the output unit 204 is a signal indicating the cutoff state, the switch 302 is in the connected state. Therefore, when both the first output information and the second output information are information for breaking the circuit breaker 4, both the switch 301 and the switch 302 are in the connected state, and the voltage Vh is supplied to the control terminal of the circuit breaker 4. To be done. Then, when the voltage Vh is supplied to the control terminal of the circuit breaker 4, the circuit breaker 4 is set to the cutoff state. That is, when both the first output information and the second output information are information for breaking the circuit breaker 4, the selecting unit 300 outputs control information for instructing the circuit breaker to the circuit breaker 4.

  Hereinafter, a flow of processing in which the control unit 106 verifies the validity of the first digital information D1 will be described. FIG. 3 is a flowchart showing an example of the flow of processing executed by the control unit 106 to verify the validity of the first digital information D1. First, the control unit 106 acquires the first digital information D1 converted from analog information to digital information by the AD conversion unit 102 (step S1). Next, the control unit 106 acquires the second digital information D2 received by the communication unit 105 and converted from analog information to digital information by the AD conversion unit 202 (step S2). The control unit 106 compares the first digital information D1 and the second digital information D2 to verify the validity of the first digital information D1 and determines whether or not the first digital information D1 is normal (step S3). When the control unit 106 determines that the first digital information D1 is normal, the control unit 106 inputs the first digital information D1 to the main relay calculation unit 103, and causes the main relay calculation unit 103 to calculate the first calculation result F1 (step S4). On the other hand, when the control unit 106 determines that the first digital information D1 is not normal, the control unit 106 causes the main relay calculation unit 103 to input the second digital information D2 received via the communication unit 105, and the main relay calculation unit 103 receives the second digital information D2. 1 Calculation result F1 is calculated. (Step S5). Then, the control unit 106 causes the output unit 104 to output the first output information OUT1 to the selection unit 300 (step S6).

  As described above, the protective relay device 10 according to the first embodiment inputs the same analog information in parallel to the main processing unit 100 and the fail-safe processing unit 200, and outputs the first output information OUT1 and the second output information OUT1, respectively. When the output information OUT2 is generated and the first output information OUT1 and the second output information OUT2 are both information for breaking the circuit breaker 4, a control signal for controlling the circuit breaker 4 to be in the breaking state by the selection unit 300 is generated. Since it is output, the reliability of control of the circuit breaker 4 can be improved.

  Further, the control unit 106 of the first embodiment communicates the validity of the first digital information D1 converted by the AD conversion unit 102 with the first digital information D1 converted by the AD conversion unit 102 by the communication unit 105. The verification is performed using at least one of the second digital information D2 acquired from the unit 205. Thereby, the reliability of control of the circuit breaker 4 can be further improved.

  Further, according to the protective relay device 10 of the first embodiment, when the control unit 106 determines that the first digital information D1 is not normal, the second digital information acquired by the communication unit 105 from the communication unit 205. Based on D2, the main relay calculation unit 103 is caused to calculate a first calculation result F1 which is control information for the circuit breaker 4. As a result, in the protective relay device 10 of the present embodiment, the first calculation result F1 is calculated using the second digital information D2 even when the first digital information D1 AD-converted by the main processing unit 100 is not normal. Therefore, the reliability of control of the circuit breaker 4 can be further improved.

  Further, according to the protective relay device 10 of the first embodiment, when the control unit 206 determines that the second digital information D2 is not normal, the first digital information acquired from the communication unit 105 by the communication unit 205. Based on D1, the fail-safe relay calculation unit 203 is caused to calculate the second calculation result F2 which is the control information for the circuit breaker 4. As a result, in the protective relay device 10 of the present embodiment, even when the second digital information D2 AD-converted by the fail-safe processing unit 200 is not normal, the second operation result F2 is obtained using the first digital information D1. Calculation can be performed, and the reliability of control of the circuit breaker 4 can be further improved.

(Second embodiment)
Next, a second embodiment will be described. FIG. 4 is a configuration diagram of a protective relay device 10A according to the second embodiment. In the following description, components having the same functions as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

  In the second embodiment, the control unit 106A receives the validity of the first output information OUT1 output by the output unit 104, the first calculation result F1 calculated by the main relay calculation unit 103, and the communication unit 105. The verification is performed using at least one of the second calculation results F2. For example, the control unit 106A compares the first output information OUT1 output by the output unit 104 with the first calculation result F1 calculated by the main relay calculation unit 103. Then, as a result of the comparison, for example, when the first output information OUT1 and the first calculation result F1 are different, the control unit 106A determines that the first output information OUT1 is not normal due to some trouble in the output unit 104 or the like. judge. Further, the control unit 106A compares the first output information OUT1 output from the output unit 104 with the second calculation result F2 calculated by the fail-safe relay calculation unit 203 of the fail-safe processing unit 200 received from the communication unit 105. To do. Then, as a result of the comparison, for example, when the first output information OUT1 and the second calculation result F2 are different, the control unit 106A determines that the first output information OUT1 is not normal.

  The case where the first output information OUT1 is not normal is a case where a malfunction occurs in the output unit 104 due to, for example, a hardware failure.

  In addition, the control unit 206A calculates the validity of the second output information OUT2 output by the output unit 204, the second calculation result F2 calculated by the fail-safe relay calculation unit 203, and the first calculation result received by the communication unit 205. Verification is performed using at least one of F1.

  Then, a bypass circuit 310 is added to the selection unit 300A in the second embodiment in addition to the configuration of the selection unit 300 in the first embodiment. As shown in FIG. 4, the bypass circuit 310 is a signal line provided with a switch 311 and a switch 312, and is connected in parallel with a signal line provided with a switch 301 and a switch 302.

The bypass circuit 310 bypasses the signal from either the switch 301 or the switch 302. For example, in the bypass circuit 310, when the switch 311 is connected and the switch 312 is opened, the voltage Vh is applied to the control terminal of the circuit breaker 4 when the switch 302 is connected regardless of the state of the switch 301. Supplied.

  In the bypass circuit 310, the switch 311 is controlled by the switch control signal CNT1 from the control unit 106A, and the switch 312 is controlled by the switch control signal CNT2 from the control unit 206A. In the normal case, both the switches 311 and 312 are controlled to be in the open state, the switch 311 is controlled to be in the connected state by the switch control signal CNT1 from the control unit 106A, and it is determined that the first output information OUT1 is not normal. The control unit 106A controls the switch 311 to be in the connected state. When it is determined that the second output information OUT2 is not normal, the switch 312 is controlled to be in the connected state by the switch control signal CNT2 from the control unit 206A. As a result, an abnormal output signal is bypassed, and a control signal to be output to the circuit breaker 4 is generated based on the normal output signal.

  As described above, in the second embodiment, the control unit 106A verifies the correctness of the first output information and the control unit 206A verifies the correctness of the second output information, and the bypass circuit 310 is controlled according to the verification result. To be done.

  According to the protective relay device 10A of the present embodiment, when the control unit 106A further determines that the first output information OUT1 output by the output unit 104 is not normal, the first calculation result F1 and the second calculation result F1 are calculated. A third operation result F3, which is a logical product with the result F2, is calculated. The control unit 106A outputs the calculated third calculation result F3 to the communication unit 105. The communication unit 105 transmits the third calculation result F3 from the control unit 106A to the communication unit 205 of the fail safe unit. The communication unit 205 outputs the received third calculation result F3 to the control unit 206. The control unit 206 causes the output unit 204 to output the third calculation result F3 as the second output information OUT2 to the selection unit 300.

  Here, the flow of processing in which the control unit 106A verifies the validity of the first output information will be described using the flowchart of FIG. First, the control unit 106A acquires the first output information OUT1 output by the output unit 104 (step S10). Next, the control unit 106 acquires the first calculation result F1 calculated by the main relay calculation unit 103 (step S11). The control unit 106 verifies the validity of the first output information OUT1 by comparing the first output information OUT1 and the first operation result F1 and determines whether or not the first operation result F1 is normal. (Step S12). When the control unit 106A determines that the first output information OUT1 is normal, the control unit 106A ends the processing shown in this flowchart. On the other hand, when the control unit 106A determines that the first output information OUT1 is not normal, first, the switch 311 of the selection unit 300 is set to the connection state, the switch 312 is set to the open state, and the first output information is bypassed (step S13). ). Next, the control unit 106 calculates a third operation result F3 which is a logical sum of the first operation result F1 and the second operation result F2 received via the communication unit 105 (step S14). Further, the control unit 106A causes the communication unit 105 to transmit the calculated third calculation result F3 to the failsafe processing unit 200 (step S15). The control unit 206 of the fail-safe processing unit 200 causes the output unit 204 to output the third calculation result F3 received by the communication unit 205 (step S16).

  As described above, according to the protective relay device 10A of the second embodiment, the same analog information is input to the main processing unit 100 and the fail-safe processing unit 200 in parallel, and each of them outputs the first output information OUT1. The main processing unit 100 verifies the validity of the first output information OUT1 and the fail-safe processing unit 200 verifies the validity of the second output information OUT2 while generating the second output information OUT2. Then, the selection unit 300 is used to bypass the information output from the malfunctioning and abnormal output unit. Further, when the first calculation result F1 calculated by the main processing unit 100 and the second calculation result F2 calculated by the fail-safe processing unit 200 are both information for breaking the circuit breaker 4, A control signal for controlling the cutoff state is output. As a result, in the second embodiment, the software processing is used to cover the trouble caused by the hardware failure, and the control signal can be output without reducing the reliability before the trouble occurs. It is possible to further improve the reliability of control for the.

(Third Embodiment)
Furthermore, a third embodiment will be described. FIG. 6 is a configuration diagram of a protective relay device 10B according to the third embodiment. In the following description, components having the same functions as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. The protective relay device 10B of the third embodiment includes protective relay devices 10-1 and 10-2.

  In the protective relay device 10B of the third embodiment, the communication unit 105-1 communicates with the communication unit 105-2. The communication unit 105-1 receives the first digital information D1-2 converted by the AD conversion unit 102-2 from the communication unit 105-2. Further, the communication unit 105-2 receives the first digital information D1-1 converted by the AD conversion unit 102-1 from the communication unit 105-1.

  The communication unit 205-1 communicates with the communication unit 205-2. The communication unit 205-1 receives the second digital information D2-2 converted by the AD conversion unit 202-2 from the communication unit 205-2. The communication unit 205-2 receives the second digital information D2-1 converted by the AD conversion unit 202-1 from the communication unit 205-1.

  The control unit 106-1 includes the first digital information D1-1 converted by the AD conversion unit 102-1 and the first digital information D1-2 acquired by the communication unit 105-1 from the communication unit 105-2. The legitimacy of the first digital information D1-1 is verified using at least one.

  Further, in the protective relay device 10B of the third embodiment, the communication unit 205-1 communicates with the communication unit 205-2. The control unit 206-1 includes the second digital information D2-1 converted by the AD conversion unit 202-1 and the second digital information D2-2 acquired by the communication unit 205-1 from the communication unit 205-2. The legitimacy of the second digital information D2-1 is verified using at least one.

  Further, in the protective relay device 10B of the third embodiment, the control unit 106-2 uses the first digital information D1-2 converted by the AD conversion unit 102-2 and the communication unit 105-2 to communicate. At least one of the first digital information D1-1 acquired from 105-1 is used to verify the validity of the first digital information D1-2.

  Further, in the protective relay device 10B of the third embodiment, the control unit 206-2 includes the second digital information D2-2 converted by the AD conversion unit 202-2 and the communication unit including the communication unit 205-2. At least one of the second digital information D2-1 acquired from 205-1 is used to verify the legitimacy of the second digital information D2-2.

  If the control unit 106-1 determines that the first digital information D1-1 is not normal, the control unit 106-1 outputs the first digital information D1-2 converted by the AD conversion unit 102-2 to the main relay calculation unit 103-1. To enter. In this way, the control unit 106-1 causes the main relay calculation unit 103-1 to perform calculation based on the first digital information D1-2 converted by the AD conversion unit 102-2, and the output unit 104- 1 to output the first output information OUT1-1.

  When the control unit 206-1 determines that the second digital information D2-1 is not normal, the control unit 206-1 outputs the second digital information D2-2 converted by the AD conversion unit 202-2 to the fail-safe relay calculation unit 203-. Input to 1. In this way, the control unit 206-1 causes the fail-safe relay calculation unit 203-1 to perform calculation based on the second digital information D2-2 converted by the AD conversion unit 202-2, and the output unit 204-1. -1 to output the second output information OUT2-1.

  When the control unit 106-2 determines that the first digital information D1-2 is not normal, the control unit 106-2 outputs the first digital information D1-1 converted by the AD conversion unit 102-1 to the main relay calculation unit 103-2. To enter. In this way, the control unit 106-2 causes the main relay calculation unit 103-2 to perform calculation based on the first digital information D1-1 converted by the AD conversion unit 102-1 and the output unit 104- 2 to output the first output information OUT1-2.

  Further, when the control unit 206-2 determines that the second digital information D2-2 is not normal, the control unit 206-2 outputs the second digital information D2-1 converted by the AD conversion unit 202-1 to the fail-safe relay calculation unit 203-. Input to 2. In this way, the control unit 206-2 causes the fail-safe relay calculation unit 203-2 to perform calculation based on the second digital information D2-1 converted by the AD conversion unit 202-1 and the output unit 204-2. -2 outputs the second output information OUT2-1.

  In addition to the first digital information D1-1 and the first digital information D1-2, the control unit 106-1 includes the second digital information D2-1 acquired from the communication unit 205-1 by the communication unit 105-1. May be used to verify the validity of the first digital information D1-1. When it is determined that both the first digital information D1-1 and the second digital information D2-1 are not normal, the control unit 106-1 determines the main relay computing unit based on the first digital information D1-2. The calculation result F1-1 that serves as a control signal may be calculated by 103-1.

  In addition to the second digital information D2-1 and the second digital information D2-2, the control unit 206-1 also includes the first digital information D1-1 acquired from the communication unit 105-1 by the communication unit 205-1. May be used to verify the validity of the second digital information D2-1. Then, when it is determined that both the second digital information D2-1 and the first digital information D1-1 are not normal, the control unit 206-1 calculates the fail-safe relay based on the second digital information D2-2. You may make the part 203-1 calculate the calculation result F2-1 used as a control signal.

  The control unit 106-2, in addition to the first digital information D1-2 and the first digital information D1-1, the second digital information D2-2 acquired from the communication unit 205-2 by the communication unit 105-2. May be used to verify the validity of the first digital information D1-2. Then, when it is determined that both the first digital information D1-2 and the second digital information D2-2 are not normal, the control unit 106-2, based on the first digital information D1-1, the main relay computing unit. The calculation result F1-2, which is a control signal, may be calculated by 103-2.

  The control unit 206-2, in addition to the second digital information D2-2 and the second digital information D2-1, the first digital information D1-2 acquired from the communication unit 105-2 by the communication unit 205-2. May be used to verify the validity of the second digital information D2-2. When it is determined that both the second digital information D2-2 and the first digital information D1-2 are not normal, the control unit 206-2 calculates the fail-safe relay based on the second digital information D2-1. You may make the part 203-2 calculate the calculation result F2-2 used as a control signal.

  As described above, in the protective relay device 10B of the third embodiment, the control unit 106-1 verifies the validity of the first output information OUT1-1, and the first output information OUT1-1 is not normal. When it is determined that the first output information OUT1 is output from the output unit 104-1 using the first digital information D1-2 converted by the AD conversion unit 102-2. As a result, in the protective relay device 10B of the present embodiment, even if the first digital information D1-1 converted by the AD conversion unit 102-1 is not normal, the normal digital signal from the output unit 104-1 is output. The 1-output information OUT1 can be output, and the reliability of control of the circuit breaker 4 can be further improved.

  According to at least one embodiment described above, in the protective relay device 10 (10A, 10B), at least two or more control signals generated based on the same electric power information are information for interrupting the circuit breaker 4. In some cases, control information for instructing interruption is output to the circuit breaker 4. As a result, in the protective relay device 10 (10A, 10B) of the present embodiment, the reliability of control of the circuit breaker 4 can be further improved.

  Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Electric power system, 2 ... Generator, 3 ... Transformer, 4 ... Circuit breaker, 5 ... Instrument transformer, 10, 10A, 10B ... Protective relay, 100, 100-1, 100-2 ... Main Processing unit, 200, 200-1, 200-2 ... Fail-safe processing unit, 300 ... Selection unit, 102, 102-1, 102-2, 202, 202-1, 202-2 ... AD conversion unit, 103, 103 -1, 103-2, ... Main relay computing unit, 203, 203-1, 203-2 ... Fail-safe relay computing unit, 104, 104-1, 104-2, 204, 204-1, 204-2 ... Output Section, 105, 105-1, 105-2, 205, 205-1, 205-2 ... Communication section, 106, 106-1, 106-2, 206, 206-1, 206-2 ... Control section.

Claims (4)

A first AD conversion unit that converts analog information regarding electric power measured by a measurement unit provided in the power transmission facility into first digital information;
A first processing unit having a first control information generation unit that generates first control information for the circuit breaker provided in the power transmission facility based on the first digital information converted by the first AD conversion unit;
A second AD conversion unit for converting analog information about the electric power measured by the measurement unit into second digital information;
A second processing unit having a second control information generation unit that generates second control information for the circuit breaker based on the second digital information converted by the second AD conversion unit;
When both the first control information and the second control information are control information for breaking the circuit breaker, a selection unit that outputs control information instructing the circuit breaker to the circuit breaker,
Equipped with
The first processing unit communicates with a second communication unit of the second processing unit, and the first digital information converted by the first AD conversion unit and the first control information generation unit generated by the first control information generation unit. Further comprising a first communication unit for transmitting control information to the second communication unit of the second processing unit,
The second processing unit communicates with the first communication unit of the first processing unit, and the second digital information converted by the second AD conversion unit and the second control information generation unit generated by the second control information generation unit. Further comprising a second communication unit for transmitting control information to the first communication unit of the first processing unit,
The first control information generation unit converts the validity of the first digital information converted by the first AD conversion unit into the first digital information converted by the first AD conversion unit or the first AD conversion unit. Verified using the first digital information obtained and the second digital information obtained from the second communication unit by the first communication unit,
The second control information generation unit converts the legitimacy of the second digital information converted by the second AD conversion unit into the second digital information converted by the second AD conversion unit or the first AD conversion unit. Verification using the first digital information obtained and the first digital information obtained from the first communication unit by the second communication unit,
Protective relay device. When the first control information generation unit determines that the first digital information is not normal according to the result of verifying the validity of the first digital information converted by the first AD conversion unit, the first communication The first control information for the circuit breaker based on the second digital information acquired from the second communication unit by the unit,
When the second control information generation unit determines that the second digital information is not normal according to the result of verifying the validity of the second digital information converted by the second AD conversion unit, the second communication is performed. Generating second control information for the circuit breaker based on the first digital information acquired from the first communication unit by the unit,
The protective relay device according to claim 1 . The first processing unit further includes a first output unit that outputs the first control information generated by the first control information generation unit as first output information,
The second processing unit further includes a second output unit that outputs the second control information generated by the second control information generation unit as second output information,
The first control information generation unit uses the first control information generated by the first control information generation unit and the first communication unit to validate the validity of the first output information output by the first output unit. If at least one of the second control information acquired from the second communication unit is verified and it is determined that the first output information output from the first output unit is not normal, the first communication unit On the basis of the second control information acquired from the second communication unit, it is determined whether or not both the first control information and the second control information are information for breaking the circuit breaker. When it is determined that the information is information for breaking the circuit breaker, third control information for instructing the breaking is generated, and the third control information is transmitted to the second processing unit by the second processing unit using the first communication unit. Sent to the communication section,
The second output unit outputs the third control information received by the second communication unit as the second output information,
The selection unit outputs the second output information to the circuit breaker regardless of the value indicated by the second output information.
The protective relay device according to claim 1 or 2 . A plurality of the first processing units,
The first first processing unit communicates with the fourth communication unit of the second first processing unit, and the first digital information converted by the first AD conversion unit of the first first processing unit and the first first processing. And a third communication unit for transmitting the first control information generated by the first control information generation unit of the unit to the fourth communication unit of the second first processing unit,
The second first processing unit communicates with the third communication unit of the first first processing unit, and the first digital information converted by the first AD conversion unit of the second first processing unit and the second first information. A fourth communication unit that transmits the first control information generated by the first control information generation unit of the processing unit to the third communication unit of the first first processing unit,
The first control information generation unit validates the validity of the first digital information converted by the first AD conversion unit, the first digital information converted by the first AD conversion unit, and the second digital information by the first communication unit. Verification is performed using at least one of the second digital information acquired from the communication unit and the first digital information acquired from the fourth communication unit by the third communication unit, and converted by the first AD conversion unit. When the determined first digital information is not normal, the first communication information for the circuit breaker is generated based on the first digital information acquired from the fourth communication unit by the third communication unit.
The protective relay device according to any one of claims 1 to 3 .

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