JP2001037072A - Protection relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate delaying of a system fault removal even when a main protection is not operated by constituting to delay or stop a breaking command of a first stage of a distance relay of a backup protection detector under the conditions of a normal transmission function of a main protection detector and a non-operation of a main protection relay. SOLUTION: A transmission fault signal outputted from a transmitter 10 is applied to one input of an AND gate 17 through a NOT gate 16, and a signal of a main protection relay operation is applied to another input of the gate 17. An output of the gate 17 is inputted to a backup protection cur-off deciding unit 14 as a fault in a protection section, and input to an AND gate 34 by the deciding unit 14. A backup protection detector 13 outputs a distance relay first stage operation as an internal direction decision relay operation, and inputs the output to the deciding unit 14. Thus, an excess cut-out when a system is faulted can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay device which prevents an excessive interruption that occurs when a protective relay device having a distance relay is applied to a short-distance transmission line.

[0002]

2. Description of the Related Art A protective relay is installed to protect equipment to be protected from a system accident or the like, and a detection unit for detecting a change in the state of the protection target, and detecting the change in the state of an internal or external accident of the protection target. It is constituted by a cutoff judging unit for judging an accident, and outputs a shutoff command to the circuit breaker when it is judged that an internal accident has occurred. In addition, with the recent improvement in microprocessor performance, the main protection function that employs a protection method that ensures high-speed shutdown and protection section determination using the transmission function, and a protection method such as a distance relay that can operate only with the input of the local electricity quantity The mainstream and back-integrated protective relay device in which the back-up protection function is adopted in one device is used. As an example, FIG. 12 shows a configuration example of a main / rearranged integrated protection relay device.

In FIG. 12, a main / rearranged protection relay device 1 includes a transmission unit 10, a main protection detection unit 11, and a main protection cut-off determination unit 12 to protect a transmission line 5 from a system accident or the like. It has a function of outputting a shut-off command to the circuit breaker 4a by a function and a back-up protection function including a back-up protection detection unit 13 and a back-up protection cut-off determination unit 14. For this reason,
In order to detect the state change of the transmission line 5, the back-integrated protection relay device 1 captures the system current condition at CT3a and the system voltage condition at PT2a, and transmits the transmission unit 10, the main protection detection unit 11 , Input to the back-up protection detection unit 13.

In the main protection function, the current conditions input to the transmission unit 10 are mutually transmitted to the other terminal, and the current conditions of the own terminal and the other terminal synchronized with sampling are input to the main protection detection unit 11. . The main protection detecting section 11 sends out a main protection relay operation output when it is determined that an accident occurs in the protection section based on the input own-end / other-end current condition and the voltage condition input from the PT 2a.

[0005] The operation output of the main protection relay is input to the main protection cut-off judging section 12, and together with other conditions, an accident of the transmission line in the section, ie, an internal accident or an accident other than the transmission line in the section, ie, an external accident. And outputs a main protection cut-off command if it is an internal accident. The main protection cutoff command is input to the breaker 4a as a cutoff command via the OR gate 15, and the breaker 4a
Becomes "open", and by disconnecting the transmission line 5 from the system, a system accident or the like can be eliminated.

The back protection function is based on the current condition input from the CT 3a input to the back protection detection unit 13 and the PT 2a.
When it is determined that an internal direction accident has occurred based on the voltage condition input from the controller, each of the internal direction determining relay operations set according to the operating duty conditions, that is, the first-stage operation of the distance relay or the second-stage operation of the distance relay and the second-stage operation of the distance relay. Outputs three-stage operation.
The internal direction determination relay operation output from the back-up protection detection unit 13, that is, the first operation of the distance relay or the second operation of the distance relay
Stage operation and distance relay third stage operation are protection protection cut-off determination unit 1
4 is input.

The first stage operation of the distance relay is an input of the 44ST1 timer 30, and the second stage operation of the distance relay is 44ST2.
Input of timer 31, distance relay third stage operation is 44ST
3 timer 32, so that after the time set by each timer elapses, 44ST1 timers 30 and 44
The ST2 timer 31 and the 44 ST3 timer 32 are output, and are output by the OR gate 15 as a protection protection cutoff command. The protection protection cut-off command is input to the circuit breaker 4a as a cut-off command via the OR gate 15, and the main contact of the circuit breaker 4a is "opened", thereby disconnecting the transmission line 5 from the system to eliminate a system accident or the like. it can.

When the equipment to be protected is a transmission line, an operation determination range and an operation delay time are set for each of the internal direction determination relays of the main protection and the back-up protection. In other words, the main protection of the main / rearranged protection relay has a duty to detect and shut off a system accident up to the other end at a high speed.

The back-up protection is a duty to detect a system accident up to the other end in a situation where the main protection cannot be operated and to shut down after a predetermined time, or a situation in which the protection relay device for protecting a section beyond the other end cannot operate. It has a duty to detect a system fault beyond the end and shut it off after a certain period of time, that is, it has a remote protection function. As an example, FIG. 13 shows the relationship between the operation determination range and the operation time of the main / rearranged protection relay device.

FIG. 13 shows a general operation determination range and a set operation time when a main and rear integrated protection relay is applied to a general transmission line. The main protection 132 detects a system fault in the section up to the other end, and outputs a cutoff command without a confirmation time. Further, the first stage 133 of the distance relay for back protection detects a system fault up to about 80% of the section to the counterpart end, and outputs an interruption command after waiting for the operation time of the main protection 132.

Next, the second stage 134 of protection distance relay detects a system fault up to about 150% of the section to the other end, and waits for the operation of the first stage 133 of rear protection distance relay in the next section. Outputs the shutdown command. Furthermore, the third stage 135 of the rear protection distance relay detects a system fault of about 150% or more of the section to the other end, and outputs a cutoff command after waiting for the operation of the second stage 138 of the rear protection distance relay in the next section. I do.

[0012] In addition, in the case of a system accident beyond the other end, a similar main unit is installed at the other end to protect the section beyond the other end.
The back-up protection relay detects a system fault in the same operation determination range and operation time and outputs a disconnection command to the circuit breaker.
The transmission line is configured so that it can be disconnected from the system.

[0013] Here, in the case of a system accident such as F1 accident 139 or F2 accident 140 in the general transmission line shown in FIG. (141) and the device 2 (142) will be described as a representative. When the F1 accident 139 occurs, the main shutoff element is the main protection shutoff 132 of the device 1 (141).
The backup shut-off element is the first-stage distance relay 133 for back-up protection of the device 1 (141), which shuts off after the 44ST1 timer.

Next, when an F2 accident 140 occurs, the main shutoff element is the main protection shutoff 136 of the device 2 (142).
The backup shut-off element is the distance protection first relay 137 of the back protection of the device 2 (142), which shuts off after the 44ST1 timer, and the remote cut-off element is the distance protection second relay of the back protection of the device 1 (141). 134, which is cut off after the 44ST2 timer.

[0015]

Even if the operation determination range of the first stage of the distance relay for rear protection is set to the minimum, the main and rear integrated protective relay device having the above configuration is set farther than the section to the counterpart end. When applied to a short-distance transmission line in which the first stage of the distance relay for back-up protection operates in the event of an accident, when the accident occurs near the other end of the transmission line between the other end and the far end, the self-end In some cases, the first stage of the distance relay for the rear protection of the main and rear integrated protection relay device of the above may operate excessively and shut off excessively. As an example, FIG. 1 is a diagram showing a relationship between an operation determination range and an operation time when the present invention is applied to a main / rearranged protection relay device for a short-distance transmission line.
It is shown in FIG.

FIG. 14 shows an operation determination range and an operation time setting in which the main and rear integrated protective relay device according to the prior art is applied to a short-distance transmission line. Distance protection first stage 13 for retrofit protection
Even if the operation determination range of Step 3 is set to the minimum, at the time of an accident farther than the section to the other end, the distance protection first stage 133 for back-up protection
, The protection section 145 that overlaps with the operation of the first stage 137 of the distance protection first relay 137 for protection of the rear of the same main / rearranged integrated protection relay that protects the section beyond the counterpart end installed at the counterpart end. Will exist.

If a system fault occurs in the protection section 145 and the main protection 136 of the same main / rearranged protection relay device installed at the other end and protecting the section beyond the other end cannot be operated. Is the distance protection first relay 137 of the same main / rearranged protective relay installed at the other end, which protects the section beyond the other end, and the main / rearranged integrated protective relay at its own end. Both the first stage 133 of the distance relay for back-up protection are operated, and after the 44ST1 timer, both the other end and the own end are cut off.

Therefore, in the prior art, when the main / backup integrated protection relay is applied to a short-distance transmission line, the 44ST1 timer of the distance relay first stage 133 of the self-end back-up protection is set to the dotted line 146 in FIG. As described above, the distance is set to be longer than the setting of the 44ST1 timer of the first relay 137 of the rear protection of the same main / rear-integrated protection relay for protecting the section beyond the counterpart installed at the counterpart end. Although the cutoff is prevented, the removal of the system fault when the main protection is inactive is delayed, which is disadvantageous in terms of system stability.

The present invention has been made in order to solve the above-mentioned problem, and even if the protection relay is set to a minimum operation determination range of the first stage of the distance relay of the back-up protection, the distance from the section to the partner end is reduced. Even if the present invention is applied to a system in which the first-stage distance relay for protection is activated in the event of a farther accident, the 44ST of the first-stage distance relay for rear protection in the self-protected relay device at its own end.
One timer can be set to the same value as a protective relay that protects a general transmission line. When applied to a short-distance transmission line, the protection relay that does not delay the removal of system faults even when the main protection is inactive. It is intended to provide an electric device.

[0020]

According to a first aspect of the present invention, there is provided a protection relay device provided that a transmission function of a main protection detection unit is normal and a main protection relay is inoperative. The configuration is such that the cutoff command of the first stage of the distance relay of the back protection detection unit is delayed or blocked.

The protection relay device according to claim 2 of the present invention transmits the operating condition of the external direction determination relay built in the protection relay device of the counterpart terminal to its own terminal using the transmission function of main protection. , Provided that the external direction determination relay is activated,
It is configured to delay or block the cutoff command of the first stage of the distance relay of the rear end protection detection unit of the own end.

According to a third aspect of the present invention, there is provided the protective relay device according to the second aspect, wherein the operating condition of the external direction determination relay is replaced with the non-operation of the distance relay of the rear protection detection unit of the partner terminal. Condition was used.

According to a fourth aspect of the present invention, in the protective relay device according to the second aspect, instead of operating conditions of the external direction determination relay, a main relay of another line other than an adjacent line installed at a partner terminal is used. The condition of protection relay operation is used.

[0024] In the protective relay device according to claim 5 of the present invention, in claim 2, instead of the operating condition of the external direction determination relay, a relay line other than the adjacent line installed at the partner terminal is provided. Protected distance relay operation conditions are now used.

[0025] In the protective relay device according to claim 6 of the present invention, in claim 2, instead of the operation condition of the external direction determination relay, the operation condition of the premises accident detection device installed at the partner terminal is used. Was used.

According to a seventh aspect of the present invention, in the protection relay device according to the second aspect, when there are two protection devices, transmission of main protection of another system as an operation condition of the external direction determination relay. The condition transmitted using the function is used.

[0027] In the protective relay device according to claim 8 of the present invention, in claim 2, the operating condition of the external direction judging relay of the own line is transmitted using the main protection transmission function of the adjacent line device. To use the specified conditions.

[0028] The protection relay device according to claim 9 of the present invention provides a distance relay for protection as a back-up protection on condition that the difference between the current of the own line and the current of the adjacent line is determined to be equal to or less than a predetermined amount. 1
The configuration is such that the cutoff command of the stage is delayed or blocked.

The protection relay device according to claim 10 of the present invention is characterized in that in claim 1, instead of the condition that the transmission function of main protection is normal and the main protection relay is inoperative, the protection relay device of its own terminal is used. A condition is used in which the period in which the magnitude of the instantaneous value of the current and the instantaneous value of the current at the other end is equal to or greater than a certain value is the same.

[0030]

FIG. 1 is a block diagram showing an embodiment of [claim 1]. 1, the same reference numerals are given to the same functional portions as those in FIG. 12, and the description will be omitted. Note that FIG. 1 has a configuration of a self-end portion, and a mating end is the same as FIG. In the present embodiment, the out-of-section accident is determined on condition that the transmission function of the main protection is normal and the main protection relay is inactive, and the cutoff command by the first stage of the distance relay is delayed or prevented. It was made.

The configuration for this will be described.
The signal of transmission failure output from is input to one input of an AND gate 17 via a NOT gate 16. The signal of the main protection relay operation is used as the other input of the AND gate 17. The output of the AND gate 17 is input as an accident in the protection section to the guard protection cutoff judging unit 14, and is used as one input of the AND gate 34 in the guard protection shutoff judgment unit 14. The back protection detection unit 13 outputs the first-stage distance relay operation as an internal direction determination relay operation, and is input to the back protection interruption determination unit 14.

In the backup protection cutoff judging section 14, the first-stage operation of the distance relay is input to the other one of the AND gates 34 and the timer 36. AND gate 34
Is an input of the OR gate 35 and the timer 3
The output of 6 is the other input of the OR gate 35.
The output of the OR gate 35 is configured to be the input of the timer 30.

Next, the operation of the first embodiment will be described with reference to FIG. Except for the parts described below, the configuration is the same as that of FIG. 12, and a description thereof will be omitted. That is, the difference will be described. When a system fault occurs and the distance relay first stage operation signal becomes “1”, if there is no transmission failure, the output of the NOT gate 16 is “0” because the output of the transmission unit 10 is “0”. 1 ". In the case of an accident within the section, the main protection relay operation signal is "1", and the accident signal within the protection section, which is the output of the AND gate 17, is "1".

Therefore, the AN of the back-up protection cutoff judging unit 14
Since one input of the D gate 34 is "1", the distance relay first stage operation signal is output from the timer 36 at the time of an accident in the protection section.
, And a backup protection cutoff command is output only by the timer 30. When the distance relay first-stage operation signal becomes "1", if the transmission failure occurs, the output of the transmission unit 10 becomes "1", so that the output of the NOT gate 16 becomes "0".

In the case of an out-of-section accident, the main protection relay operation signal is "0", and in either case, the AND gate 1
7 is "0", the input signal of one of the AND gates 34 of the back-up protection cut-off judging unit 14 is "0", which is not satisfied. Since the relay first-stage operation signal is output as the back-up protection cut-off command signal after the time limit of both the timer 36 and the timer 30, the distance relay first-stage operation signal is delayed. In the case where the timer 36 is not provided, the rear protection cutoff command is not output, so that the distance relay first stage operation signal is blocked.

According to the present embodiment, when applied to a short-distance transmission line, it is possible to prevent an excessive interruption by the first stage of the distance relay of the self-end device at the time of a system fault beyond the other end.

FIG. 2 is a block diagram showing an embodiment of [claim 2]. 2, the same functional portions as those in FIGS. 12 and 1 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, an external direction determination relay (not shown) is provided in the back-up protection detection unit 73 at the opposite end, and the relay is transmitted to the own end.

That is, an external direction determination relay (not shown) is installed in the back-end protection detection unit 73 of the other end, and an external direction determination relay operation signal is input to the transmission unit 70. The transmission unit 70 at the other end transmits the input external direction determination relay operation signal to the transmission unit 10 at the own end via the transmission line 6 as an out-of-protection section fault condition, and the transmission unit 10 at the own end has been transmitted. The configuration is such that the out-of-protection-section accident signal is input to the back-up protection cut-off determining unit 14 via the NOT gate 16 as an in-protection section accident signal.

Next, the operation will be described. When a system fault occurs behind the partner terminal or the like, the external direction determination relay operation signal in the back protection detection unit of the partner terminal becomes "1", and the transmission unit 70 of the partner terminal transmits the transmission path 6 to the transmission unit 10 of the own terminal. , And the out-of-protection section accident signal becomes “1”. When the out-of-protection-section accident signal becomes "1", the in-protection-section accident signal via the NOT gate 16 becomes "0".

According to the present embodiment, the operation condition of the external direction determination relay built in the protection relay device of the partner terminal is transmitted using the transmission function of the main protection, and the section is set on condition that the external direction relay is operated. It is configured to judge that an external accident has occurred and to delay or block the cutoff command by the first stage of the distance relay. It is possible to provide a protective relay device that can prevent an excessive interruption by one stage.

FIG. 3 is a block diagram showing an embodiment of the protective relay device according to [claim 3]. 3, the same functional portions as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. The difference between this embodiment and FIG. 2 is that, instead of the external direction determination relay operation signal, the internal direction determination relay operation signal, that is, the distance relay operation is performed under the condition through the NOT gate 76 outside the protection zone. The point is that it is configured to be used as a signal. Other configurations are the same as those in FIG.

Next, the operation will be described. First, when a system fault occurs behind a partner terminal or the like, the internal direction determination relay operation signal in the rear protection detection unit of the partner terminal, that is, the distance relay operation is inactive and becomes "0". If the internal direction determination relay operation signal is "0", the out-of-protection-section accident signal via the NOT gate 76 becomes "1". And the out-of-protection section accident signal becomes “1”. Then, when the out-of-protection-section accident signal becomes "1", the self-end in-protection-section accident signal via the NOT gate 16 becomes "0", so that the out-of-protection section accident is determined.

According to the present embodiment, the same effect as in claim 2 can be obtained under the condition that the distance relay for protecting the counterpart terminal is not operated instead of the operation condition of the external direction determination relay.

FIG. 4 is a block diagram showing an embodiment of the protective relay device according to claim 4. 4, the same functional portions as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. The difference between the present embodiment and FIG. 2 is that the protection section under the condition that the main protection relay operation signal of another line other than the adjacent line installed at the other end is input instead of the external direction determination relay operation signal. It is designed to be used as an outside accident signal.

Next, the operation will be described. When a system fault occurs behind the partner terminal or the like, a device signal other than the line adjacent to the partner terminal, that is, the main protection relay operation signal in the main protection detection unit operates, so that it becomes "1", which is transmitted to the own terminal. The condition is input to the main protection detection unit via the unit, and the condition becomes "1" as the out-of-protection-section accident signal, thereby determining that the out-of-protection-section accident has occurred.

According to the present embodiment, the same effect as [Claim 2] can be obtained under the condition of the operation of the main protection relay of the line other than the adjacent line installed at the other end instead of the operation condition of the external direction determination relay. can get.

FIG. 5 is a block diagram showing an embodiment of the protection relay device according to claim 5. 5, the same functional portions as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. The difference of this embodiment from FIG. 2 is that instead of the external direction determination relay operation signal, an internal direction determination relay operation signal for back-up protection of other lines other than the adjacent line installed at the other end, that is, the distance relay operation Is used as the out-of-protection-section accident signal under the condition that is input.

Next, the operation will be described. When a system fault occurs behind the partner terminal, etc., the internal direction determination relay operation signal of the device other than the adjacent line installed at the partner terminal, that is, the distance relay of the protection protection detector operates, so that it becomes “1”. Since the signal is input to the main protection detection unit 11 via the end transmission unit 10 and becomes "1" as the out-of-protection section accident signal, it is determined that the out-of-protection section accident has occurred.

According to this embodiment, instead of the operation condition of the external direction judging relay, the condition of the operation of the distance relay for back-up protection of other lines other than the adjacent line installed at the other end is the same as [Claim 2]. The effect is obtained.

FIG. 6 is a block diagram showing an embodiment of the protective relay device according to claim 6. 6, the same functional portions as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. The difference between the present embodiment and FIG. 2 is that instead of the external direction determination relay operation signal, the detection unit 77 of the premises protection relay device of the premises accident detection device 700 installed at the other end is connected to the self-end transmission unit 10. In that it is used as an accident signal outside the protection section under the conditions input through the system.

Next, the operation will be described. When a system fault occurs behind the partner terminal or the like, the premises protection relay of the premises accident detection device 700 installed at the partner terminal operates, so that the signal becomes “1” and is input via the own end transmission unit 10. Since the above-mentioned condition becomes "1" as the out-of-protection section accident signal, it is determined that the out-of-protection section accident has occurred.

According to the present embodiment, the same effect as in claim 2 can be obtained under the condition of operation of the indoor accident detection device installed at the other end instead of the operation condition of the external direction determination relay.

FIG. 7 is a block diagram showing an embodiment of a protection relay device according to [claim 7]. 7, the same functional portions as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. The difference between this embodiment and FIG. 2 is that the out-of-protection-zone accident condition is set to one input of an AND gate 20 via a NOT gate 18 and is input from the other terminal which is input from the other duplexed device. The condition of the out-of-protection-section accident 89 transmitted using the transmission path of the main protection function is used as the other input of the AND gate 20 via the NOT gate 19, and the output of the AND gate 20 is prepared as an accident signal in the protection section. The configuration is such that the input is provided to the protection cutoff determination unit 14. The other duplexed device has the same configuration.

Next, the operation will be described. When a system fault occurs behind the partner terminal or the like, the out-of-protection section fault 51 is input to the own apparatus from the other end, and the out-of-protection section 89 is transmitted to the other apparatus. If either the out-of-protection section accident 51 of the own apparatus or the out-of-protection section accident 89 of another apparatus becomes “1”, the in-protection section accident (the output signal of the NOT gates 18 and 86) becomes “0”. Therefore, it is determined that the accident is outside the protection zone. Further, even if the transmission unit 10 and the transmission path 6 of the main protection function of the own apparatus and the other end apparatus are not operating normally due to some kind of fault, the out-of-protection section accident 89 of the other apparatus becomes "1" and the protection is performed. Since the in-section accident signal becomes “0” in the same manner as described above, it can be determined that the out-of-protection section accident has occurred.

According to the present embodiment, the protection relay
When there is a series, the same effect as in claim 2 can be obtained by using the condition transmitted using the transmission function of the main protection of another series as the operating condition of the external direction determination relay.

FIG. 8 is a block diagram showing an embodiment of the protective relay device according to claim 8. 8, the same functional portions as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. The difference between this embodiment and FIG. 2 is that the condition of the accident 51 outside the protection zone is changed by the AND gate 2 via the NOT gate 18.
0, which is input from the device on the adjacent line and is transmitted from the partner terminal using the transmission path of the main protection function. As an input, the output of the AND gate 88 is used as an accident signal within the protection section as a protection protection cut-off judging section 84
The point is that it is configured to input. The device of the adjacent line has the same configuration.

Next, the operation will be described. When a system accident occurs behind the partner terminal or the like, the own line device is out of the protection zone accident 51 from the partner terminal, and the adjacent line device is outside the protection zone accident 89 from the partner terminal.
Is transmitted. If either the out-of-protection section accident 51 of the own line apparatus or the out-of-protection section accident 89 of the adjacent line apparatus becomes “1”, the in-protection section accident signal (AND gate 20 or 88)
Output side) is "0", so it is determined that the accident is out of the protection zone. Further, even if the transmission unit 10 and the transmission line 6 of the main protection function of the own line device or the other end device are not operating normally due to some defect, the out-of-protection accident 89 of the other line device becomes “1” and the protection is performed. Since the accident signal within the section becomes “0”, it can be determined that the accident is outside the protection section.

According to the present embodiment, the operation condition of the external direction determination relay of the own line is used as the condition transmitted by using the transmission function of the adjacent line device main protection. Similar effects can be obtained.

FIG. 9 is a block diagram showing an embodiment of the protection relay device according to claim 9. In FIG. 9, FIG.
2, the same reference numerals are given to the same functional parts as those in FIG. In FIG. 9, the size judgment 91 is to input the current condition of the transmission line 5-1 of the adjacent line at CT3-1 and compare the size with CT3 which is inputting the current condition of the transmission line 5 of the own line. If the difference between the sizes is equal to or less than the predetermined amount, the output 92 indicates that they are the same amount. Same amount 92
Is input to the backup protection cut-off judging section 14 via the NOT gate 93 as an accident signal in the protection section.

Next, the operation will be described. If a system fault occurs behind the partner terminal, etc., the magnitude of the current flowing through the transmission line 5 of the own line and the current of the transmission line 5-1 of the adjacent line become equal. The size determination 91 in which the current condition of the transmission line 5-1 of the adjacent line is input by CT 3-1 determines that the difference between the sizes is equal to or less than a predetermined amount, and It becomes “1”. Same amount 92
Becomes "1", the accident signal within the protection section via the NOT gate 93 becomes "0", so that it is determined that the accident is outside the protection section.

According to the present embodiment, an out-of-section accident is determined on condition that the difference between the magnitude of the own line current and the magnitude of the adjacent line current is equal to or less than a predetermined amount. A protection relay device that can prevent an excessive interruption by the first stage of the distance relay of the self-end device at the time of a system accident beyond the other end even when the present device is applied to a short-distance transmission line because the configuration is such that the device is applied to a short-distance transmission line. it can.

FIG. 10 is a block diagram showing an embodiment of a protective relay device according to claim 10, and FIG. 11 is a conceptual diagram of phase determination. 10, the same reference numerals are given to the same functional portions as in FIGS. 12 and 1, and the description is omitted.
In FIG. 10, the phase judgment 94 inputs the own-end / other-end current condition 95 and compares the instantaneous value of the current of the own end with the instantaneous value of the current of the other end which is equal to or larger than a certain value as shown in FIG. If they are the same, the result of the phase determination is output. The result of the phase determination is a stretched signal of half a cycle or more, and is output as the same phase 96. The same phase 96 is configured to be input to the post-protection protection cut-off judging section 14 via the NOT gate 97 as an accident signal in the protection section.

Next, the operation will be described. When a system fault occurs behind the partner terminal or the like, the current becomes a passing current, so that the phases of the own-end current and the other-end current become equal. 11, it is determined that the period in which the instantaneous value of the current at the own end and the instantaneous value of the current at the other end are equal to or larger than a predetermined value is the same, and the same phase 96 output is "1". When the same phase 96 becomes "1", N
Since the accident signal within the protection section via the OT gate 97 becomes "0", it is determined that the accident is outside the protection section.

According to the present embodiment, the magnitude of the instantaneous value of the current at the own end and the magnitude of the instantaneous value of the current at the other end are replaced with the condition that the transmission function of the main protection is normal and the main protection relay is not operating. The same effect as [Claim 1] can be obtained under the condition that it is determined that the period of time equal to or more than a certain value is the same.

[0065]

As described above, according to the present invention, an out-of-section accident is determined based on the condition that the main protection transmission function is normal and the main protection relay is inoperative, and a cutoff command is issued by the first stage of the distance relay. A protection relay device that can prevent an excessive interruption by the first stage of the distance relay of the self-end device at the time of a system accident beyond the other end even when the present device is applied to a short-distance transmission line because the configuration is such that the device is applied to a short-distance transmission line. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a protection relay device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a protective relay device according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a protective relay device according to an embodiment of claim 3.

FIG. 4 is a configuration diagram of a protection relay device according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of a protection relay device according to an embodiment of the present invention.

FIG. 6 is a configuration diagram of a protective relay device according to an embodiment of the present invention.

FIG. 7 is a configuration diagram of a protection relay device according to an embodiment of the present invention.

FIG. 8 is a configuration diagram of a protective relay device according to an embodiment of the present invention.

FIG. 9 is a configuration diagram of a protection relay device according to an embodiment of the present invention.

FIG. 10 is a configuration diagram of a protection relay device according to an embodiment of the present invention.

FIG. 11 is a conceptual diagram of a phase determination according to [claim 10].

FIG. 12 is a configuration diagram of a conventional protection relay device.

FIG. 13 is a diagram illustrating a relationship between an operation determination range and an operation time of the protection relay device of the related art.

FIG. 14 is a diagram illustrating a relationship between an operation determination range and an operation time when a conventional protection relay device is applied to a short-distance transmission line.

[Explanation of symbols]

1, 7, 8 Main / rearranged integrated protection relay device 2 PT 3 CT 4 Circuit breaker 5 Transmission line 6, 90 Transmission line 10, 70, 80 Transmission unit 11, 71, 81 Main protection detection unit 12, 72, 82 Main protection cut-off determination unit 13, 73, 83 Back-up protection detection unit 14, 74, 84 Back-up protection cut-off determination unit 15, 33, 35, 75, 85 OR gate 16, 18, 19, 76, 86, 87, 93, 97
NOT gate 17,20,34,88 AND gate 30-32,36 Timer

Claims (10)

[Claims] 1. A protection relay device comprising: a main protection detection unit of a protection relay for determining presence / absence of a system fault by acquiring information on a counterpart electrical station using a transmission function; and a rear protection detection unit by a distance relay. On the condition that the transmission function of the main protection detection unit is normal and the main protection relay is inactive, the cutoff command output by the distance relay first stage operation of the back-up protection detection unit is delayed or prevented. Protective relay device. 2. A protection relay device comprising: a main protection detection section of a protection relay for determining presence / absence of a system fault by acquiring information on a partner electrical station using a transmission function; and a rear protection detection section by a distance relay. The operating condition of the external direction determination relay built in the protection relay device of the partner terminal is transmitted to the own terminal using the transmission function of the main protection, and the condition is automatically set on condition that the external direction determination relay at the partner terminal is operated. A protection relay device for delaying or preventing a cutoff command output by a first stage operation of a distance relay of a rear protection detection unit at an end. 3. The protective relay device according to claim 2, wherein
A protection relay device characterized by using a non-operation condition of a distance relay of a rear protection detection unit of a partner terminal instead of an external direction determination relay. 4. The protective relay device according to claim 2,
A protection relay device characterized by using the operating conditions of a main protection relay of a line other than the adjacent line installed at a partner terminal instead of the external direction determination relay. 5. The protection relay device according to claim 2, wherein
A protection relay device characterized by using, instead of the external direction determination relay, the operating condition of a distance relay for back-up protection of other lines other than the adjacent line installed at the partner terminal. 6. The protective relay according to claim 2, wherein
A protection relay device characterized by using the operating condition of a premises accident detection device installed at a partner terminal instead of an external direction determination relay. 7. The protective relay device according to claim 2, wherein
In the case where there are two protection relays, under the condition transmitted by using the transmission function of the main protection of another system as the operating condition of the external direction determination relay, the cutoff command output by the first stage operation of the distance relay of the back protection is provided. A protective relay device characterized by delaying or preventing the delay. 8. The protective relay according to claim 2,
Under the conditions transmitted by using the transmission function of the main protection of the adjacent line device, the operation condition of the external direction determination relay of the own line is to delay or prevent the cutoff command output by the first stage operation of the distance relay of the back-up protection. Features a protective relay device. 9. A protection relay device for a parallel line using a distance relay, wherein a distance relay for back-up protection is provided on the condition that a difference between the magnitude of the own line current and that of the adjacent line current is determined to be equal to or smaller than a predetermined amount. A protection relay device for delaying or preventing a shutdown command output by a first-stage operation. 10. The protection relay device according to claim 1, wherein the condition that the magnitude of the instantaneous value of the instantaneous current of the self-end and the instantaneous value of the current of the other end is equal to or more than a predetermined value is the same, A protection relay device for delaying or preventing a cutoff command output by a first-stage operation of a distance relay for back-up protection.