JP2001103655A - Transmission line protective relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission line protective relay which can make single-phase reclosing without causing three-phase interruption, even when an interline voltage including a disconnected phase drops during single-phase reclosing no-voltage time and the pertinent undervoltage relay operates. SOLUTION: A transmission line protective relay has an accident detecting circuit, which constituted by combining directional relays DI and DO, undervoltage relays UV-1, UV-2, and UV-3, and carriers with each terminal of a transmission line and a single-phase reclosing function which only interrupts a faulty phase and again turns on a circuit breaker, after single-phase reclosing no-voltage time when a one-line ground fault occurs. The relay is also provided with a means which detects an interrupted phase, when an interrupt command is issued to the faulty phase during the single-phase reclosing no-voltage time and a means which locks the outputs of the relays UV-1, UV-2, and UV-3, including an interrupted phase by using the detected output of the interrupted phase. When the relay is constituted in this way, one-phase interruption can be detected during the single-phase reclosing no-voltage time, and the interrupted phase can be detected from the interrupt command to the faulty phase. Therefore, single-phase reclosing becomes possible without causing three-phase interruption, because the relays UV-1, UV-2, and UV-3 which input interline voltage including the interrupted phase make unnecessary operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention has a reclosing function,
The present invention relates to a protective relay having an accident detection sequence using an undervoltage relay.

[0002]

2. Description of the Related Art In a transmission line protection relay device, a fault in a protection section of a transmission line is simultaneously cut off at each end. Generally, each terminal detects whether the fault is in an internal direction or an external direction. A direction comparison system in which a relay, an undervoltage relay, and a carrier are combined is employed.

[0003] Further, in the transmission line protection relay device, most of the transmission line accidents are caused by lightning damage, and after the accident is shut down, the transmission line is shut off after an appropriate deionization time (reclosure no-voltage time). In many cases, when the equipment is turned on again, the insulation at the fault point is restored and the power transmission can be restarted in many cases. Among the re-closing functions, in particular, in the case of a single-line ground fault, a single-phase re-closing circuit capable of transmitting power using the other two sound phases until the circuit breaker is turned on again after shutting off only the fault phase. This is an excellent function for stable and stable power supply.

FIG. 8 is a system diagram showing an example of the application of the directional relay and the undervoltage relay of the aspect of the single-phase reclosing and the direction comparison method, and a sequence circuit diagram of an accident detection using the undervoltage relay of the direction comparison method. It is shown in FIG.

FIG. 8 shows a terminal A at a power supply terminal and a terminal B at a non-power supply terminal (here, the power supply terminal is a terminal through which a fault current flows such that an internal direction relay of the terminal can operate in the event of a fault in the protection zone. The term "non-power-supply end" means a terminal through which no fault current flows so that the internal direction relay of the terminal can operate at the time of the fault.) 1 is a bus at the A end, and 2 is a bus at the B end. Buses 1 and 2 are the breaker CB-A at the A end and the breaker CB-A at the B end.
The transmission lines are connected via R through R, S and T phases. DI indicates an internal direction relay, DO indicates an external direction relay, and the current transformer CT-A at the A end and the current transformer CT-B at the B end.
The operation is determined based on the respective current inputs. The voltage of the bus 2 at the B end is input to the undervoltage relays UV-1, UV-2, and UV-3 via the transformer PT. Undervoltage relay UV
Reference numerals -1, UV-2 and UV-3 are relays which determine the operation by using the line voltage as input for the purpose of detecting a short circuit accident. That is, the undervoltage relay -UV-1 is connected to the transformer P
The operation is determined based on the RS phase voltage of T, UV-2 is the same ST phase voltage, and UV-3 is the same TR phase voltage.

FIG. 9 is a sequence circuit diagram of an accident detection using an undervoltage relay by a direction comparison method of a transmission line protection relay installed at the end B.

Reference numeral 11 designates a circuit for outputting an output in response to a cut-off allowance signal from the terminal A, which is transmitted to the terminal B via a transmission device using a carrier under the operating condition of the internal direction relay DI at the terminal A in FIG. UV-1, UV-2, and UV-3 are undervoltage relays corresponding to FIG. 8, respectively, and output when the input value of the voltage falls below the set value. Undervoltage relay UV-1, UV-
2. The output of UV-3 is input to a logical sum circuit 12 (hereinafter, referred to as an OR gate), and the output of the OR gate 12 is one of a logical product circuit 14 (hereinafter, referred to as an AND gate). Input. DO detects an external rear accident at the end B with an external direction relay corresponding to FIG. 8 and outputs an output. The output becomes the other input of the AND gate 14 via the inverting circuit 13 (hereinafter, referred to as a NOT gate). AND gate 1
5 is a circuit 1 for outputting an output based on the cut-off permission signal from the terminal A described above.
Based on 1 and the output of the AND gate 14, a three-phase cutoff command is issued to the B-end circuit breaker CB-B in FIG.

That is, the sequence circuit diagram of the fault detection using the undervoltage relay according to the direction comparison method is as follows. Voltage relay UV-1,
The configuration is such that a three-phase cutoff command is issued on condition that one of the operations of UV-2 and UV-3 and the external direction relay DO at the B end are not operated.

[0009]

A problem during a single-phase reclosing no-voltage time in a fault detection sequence circuit using an undervoltage relay of a direction comparison type in a transmission line protection relay having the above configuration will be described. .

FIG. 10 shows the bus voltage at the terminal B during the single-phase reclosing no-voltage time at the time of the R-phase fault in the non-power source terminal system. 1 during single-phase reclosing no-voltage time
The voltage is the same as the phase break. In other words, the line voltage Vst not including the R phase during disconnection is a healthy voltage (110 V), but the line voltages Vrs and Vtr including the R phase during disconnection are completely balanced in all three phases of the load behind the B end. If the load is unbalanced, it is １ ／ of the normal state (55 V with respect to the PT secondary rating of 110 V).
It moves indefinitely during r2. For this reason, the line voltages Vrs and Vtr including the R phase during disconnection fall in the range of 55V to 0V.

On the other hand, in the fault detection sequence circuit shown in FIG. 9, during the single-phase reclosing no-voltage time, the output of the circuit 11 which outputs an output with a cut-off permission signal according to the operating condition of the internal direction relay DI at the terminal A is the internal fault recovery. From the predetermined time (about 100 ms to 200 ms), and since the external direction relay DO at the B end is in an inoperative state, the line voltage Vrs including the R phase during the disconnection among the undervoltage relays at the B end is not satisfied. Either the undervoltage relay UV-1 or UV-3, which receives Vtr as an input, operates, and the terminal B is shut off in three phases.

As described above, the conventional transmission line protection relay cannot utilize the excellent function of the single-phase reclosing circuit, and has a problem in the stability of the power system.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem, and the line voltage including the disconnection phase is reduced during the single-phase reclosing no-voltage time so that the undervoltage relay operates. However, it is an object of the present invention to provide a transmission line protection relay capable of single-phase reclosing without three-phase interruption.

[0014]

According to a first aspect of the present invention, there is provided a transmission line protection relay device, comprising: a directional relay for detecting whether an accident is in an internal direction or an external direction; An accident detection circuit that combines an undervoltage relay and a carrier wave, and a single-phase reclosing function that shuts off only the fault phase in the case of a one-line ground fault and then re-opens the circuit breaker after a no-phase time In the transmission line protection relay device, means for detecting a breaking phase under the condition of a single-phase reclosing no-voltage time and a breaking command to the fault phase, and an output of the undervoltage relay including a breaking phase by the breaking phase detection output. And means for locking.

[0015] In short, as means for detecting the one-phase cut-off phase, 1
The phase cutoff is detected during the single-phase reclosing no-voltage time, and the cutoff phase is detected by the cutoff command to the fault phase. Locking the output of a phase allows a single-phase reclosing without three-phase interruption. Further, a short-circuit accident in the protection section during the single-phase reclosing no-voltage time is a short-circuit accident of the remaining phase that does not include the disconnection phase.

According to a second aspect of the present invention, as the transmission line protection relay device, the one-phase interruption is detected during the single-phase reclosing no-voltage time, and the interruption phase is detected by the circuit breaker. Other than the above, only the pallet state is detected based on the condition, and the rest is the same as the first aspect.

In the transmission line protection relay device according to claim 3 of the present invention, the one-phase cutoff phase is the same as the one-phase disconnection phase, so that only the detection of the one-line disconnection phase from the voltage input is performed. Same as item 1.

According to a fourth aspect of the present invention, there is provided a transmission line protection relay comprising: means for delaying the output of an undervoltage relay for a predetermined time under a condition during a single-phase reclosing no-voltage time; Means for making the output of the undervoltage relay instantaneous on condition that there is no output inside.

In short, during the single-phase reclosing no-voltage time, the output of the cut-off allowance signal due to the internal directional relay operating condition at the other end continues for a predetermined time (100 ms to 200 ms) from the recovery from the internal accident. By delaying the output of the undervoltage relay for the duration of the output of the cut-off permission signal under the condition during time, even if there is an unnecessary operation of the undervoltage relay, the three-phase cutoff does not occur and the single-phase reclosing becomes possible. Also, when the single-phase reclosing operation is not performed during the non-voltage period, normal instantaneous shutoff can be performed.

According to a fifth aspect of the present invention, there is provided a transmission line protection relay device comprising a means for utilizing the means of the first aspect by means for detecting the elapse of a predetermined time from the start of the single-phase reclosing circuit.

In short, during the single-phase reclosing no-voltage time, the output of the shut-down allowance signal due to the internal directional relay operating condition of the other end continues for a predetermined time (100 ms to 200 ms) from the recovery from the internal accident. By making use of the means of claim 1 limited to the duration, it is possible to detect an accident such as a multiplex accident between lines during a single-phase reclosing no-voltage time.

According to a sixth aspect of the present invention, there is provided a transmission line protection relay comprising means for utilizing the means of the second aspect by means for detecting the elapse of a predetermined time from the start of the single-phase reclosing circuit.
The basic operation is the same as in claim 5.

According to a seventh aspect of the present invention, there is provided a transmission line protection relay comprising means for utilizing the means of the third aspect by means for detecting the elapse of a predetermined time from the start of the single-phase reclosing circuit.
The basic operation is the same as in claim 5.

According to an eighth aspect of the present invention, there is provided a transmission line protection relay device comprising: a directional relay for detecting whether an accident is an internal direction or an external direction; and an undervoltage relay for inputting a line voltage to each terminal of the transmission line. A transmission line protection relay having a single-phase reclosing function that shuts off only the fault phase in the case of a single-line ground fault and re-opens the circuit breaker after no-voltage time in the case of a single-line ground fault. A first means for detecting a breaking phase on condition of a single-phase reclosing no-voltage time and a breaking command to a fault phase; and the undervoltage relay including a breaking phase by a breaking phase detection output of the first means. Second means for locking the output of the under voltage relay, third means for locking the output of the corresponding phase of the undervoltage relay having a phase voltage as input by the cut-off phase detection output of the first means, and the second means Output or the output of the third means. And a fourth means for detecting that there is a force.

In short, the function of claim 1 and the shut-down phase of the undervoltage relay having the phase voltage as input do not need to be operated, so that the output is locked by the cut-off phase detection output, and the single-phase reclosing no-voltage time in the remaining phases. Ground faults in the inner protection section can be cut off.

According to a ninth aspect of the present invention, there is provided a transmission line protection relay according to the second aspect, further comprising: means for locking an output of the phase of an undervoltage relay to which a phase voltage is input by the cutoff phase detection output. And means for detecting whether there is an output of the means or the output of the means of claim 2. The basic operation is the same as in claim 8.

According to a tenth aspect of the present invention, there is provided a transmission line protection relay device according to the third aspect, and means for locking an output of the corresponding phase of an undervoltage relay to which a phase voltage is input by the cutoff phase detection output. And means for detecting whether there is an output of the means or the output of the means of claim 3. The basic operation is the same as that of claim 8.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a transmission line protection relay according to the present invention will be described below with reference to FIG.

FIG. 1 is a diagram showing an embodiment of a sequence circuit diagram for detecting an accident in the transmission line protection relay device of the present invention.
In FIG. 1, the same devices and components as those in FIG. 9 are denoted by the same reference numerals. In the present embodiment, as a means for detecting the one-phase cut-off phase, 1
The phase cutoff is detected during the single-phase reclosing no-voltage time, and the cutoff phase is detected by the cutoff command to the fault phase. It is configured to lock the output of the phase.

In FIG. 1, the R-phase, S-phase or T-phase is provided under the condition of the circuit 20 which outputs during the single-phase reclosing no-voltage time and the cutoff command to the R-phase, S-phase or T-phase fault phase. , And the output of the R-phase cutoff detection circuit 21 is input to one input of an OR gate 24,
One input of the AND gate 30 is provided via the NOT gate 27, and the other input of the AND gate 30 is connected to the line voltage Vr.
Undervoltage relay UV-1 which outputs operation output with s as input
Output is connected. Similarly, the output of the R-phase cutoff detection circuit 21 is used as one input of the OR gate 26,
The other input of the AND gate 32 is connected to an output of an undervoltage relay -UV-3 which outputs an operation output using the line voltage Vtr as an input through the gate 29. In other words, when the R-phase cutoff is detected, the AND gate is operated even when one of the undervoltage relays -UV-1 or UV-3 that receives the line voltages Vrs and Vtr including the disconnected R-phase operates unnecessarily. 30 and AND gate 32
Is locked, it is possible to prevent three-phase interruption. Similarly, the output of the S-phase cutoff detection circuit 22 is O
Since the voltage is input to the AND gate 30 via the R gate 24 and the NOT gate 27, and is input to the AND gate 31 via the OR gate 25 and the NOT gate 28, the line voltages Vrs and Vst including the S phase are input. The output of the undervoltage relay UV-1 or UV-2 to be input is locked. T
The output of the phase cutoff detection circuit 23 is also
Is input to the AND gate 31 via the NOT gate 28, and is input to the AND gate 32 via the OR gate 26 and the NOT gate 29. Therefore, the line voltages Vst and Vtr including the T phase are input. Undervoltage relay -UV-3
Alternatively, the output of UV-1 is locked.

FIG. 2 is a diagram showing another embodiment of a sequence circuit diagram for detecting an accident in the transmission line protection relay device of the present invention. In the present embodiment, the detection means of the one-phase cutoff phase is configured so that the one-phase cutoff is detected during the single-phase reclosing no-voltage time, and the cutoff phase is detected on the basis of the pallet state of the circuit breaker.

In FIG. 2, the R-phase, S-phase, or T-phase is provided under the condition of the circuit 20 outputting during the single-phase reclosing no-voltage time and the pallet state of the R-phase, S-phase, or T-phase breaker. Circuit 33, 34, 35 for detecting the cut-off phase of R. In the case of R-phase cut-off, the contact 52b-1 is closed and AND
The gate 33 outputs. Similarly, in the case of S-phase interruption, contact 5
2b-2 is closed and the AND gate 34 outputs. In the case of T-phase cutoff, the contact 52b-3 is closed and the AND gate 3
5 is output. The subsequent configuration is the same as in FIG.

FIG. 3 is a diagram showing still another embodiment of a sequence circuit diagram for detecting an accident in the transmission line protection relay device of the present invention. In the present embodiment, as a detection means of one interruption phase, one-phase interruption is detected during a single-phase reclosing no-voltage time, and since one-phase interruption phase is the same as one-phase disconnection phase, detection of one-line disconnection phase from voltage input. It is configured so that

In FIG. 3, the R-phase, S-phase is detected by detecting the condition of the circuit 20 that outputs during the single-phase reclosing no-voltage time and the one-phase disconnection phase from the R-phase, S-phase, or T-phase voltage input. The circuit 36, 37, 38 for detecting a phase or a T phase cutoff phase is constituted, and an example of means for detecting a disconnection phase is shown by R in FIG.
This will be described using an example of phases. In FIG. 4, at the time of a one-line ground fault in the high-resistance grounding system, the phase voltage value is the same as that in the normal state and has the same phase as VrF1. At the time of a one-line ground fault in the direct grounding system, the phase voltage value becomes substantially zero as in VrF2. At the time of disconnection, there is a predetermined phase voltage value, and the phase is in the opposite phase to the normal state. Therefore, the discrimination between the accident and the disconnection can be clarified by judging the phase voltage value and the phase angle (for example, about 60 degrees as θ). The subsequent configuration is the same as in FIG.

FIG. 5 is a diagram showing still another embodiment of a sequence circuit diagram for detecting an accident in the transmission line protection relay device of the present invention. In this embodiment, during the single-phase reclosing no-voltage time, the output of the cut-off allowance signal due to the internal direction relay operating condition of the other end continues for a predetermined time (100 ms to 200 ms) from the recovery from the internal accident. The output of the undervoltage relay is delayed by the duration of the output of the cut-off allowance signal under the condition of time.

In FIG. 5, the condition of the circuit 20 outputting during the single-phase reclosing no-voltage time is determined via the NOT gate 41 as AN.
An undervoltage relay UV- is connected to one input of a D-gate 42 and the other input of the AND gate 42 to a line voltage.
1, the outputs of UV-2 and UV-3 are connected via an OR gate 12. On the other hand, the output of the OR gate 12 is
4 (hereinafter referred to as a timer) to one of the OR gates 44. The other input of the OR gate 44 is the aforementioned AN
The output of the D gate 42 is connected.

FIG. 6 is a diagram showing still another embodiment of a sequence circuit diagram for detecting an accident of the transmission line protection relay device of the present invention. In the present embodiment, the output of the shut-down permission signal based on the internal relay operation condition of the other end continues for a predetermined time (100 ms to 200 ms) from the internal accident recovery during the single-phase reclosing no-voltage time in the configuration of FIG. The configuration is such that the output of the undervoltage relay according to FIG. 1 is locked for a predetermined time from the single-phase reclosing start.

In FIG. 6, the output of the timer 52, which receives the condition of the circuit 51 which is output when the single-phase reclosing circuit is started, is NOT
One input of the AND gates 54, 55, 56 via the gate 53. The other inputs of the AND gates 54, 55, 56 are connected to OR gates 24, 25, 26, respectively, and the outputs are input to NOT gates 27, 28, 29, respectively. The subsequent configuration is the same as in FIG.

As in the case of FIG. 6, the embodiment of FIG. 2 may be configured to lock the output of the undervoltage relay for a predetermined time from the start of the single-phase reclosing.

As in the case of FIG. 6, the embodiment of FIG. 3 may be configured to lock the output of the undervoltage relay for a predetermined time after the single-phase reclosing starts.

FIG. 7 is a diagram showing still another embodiment of a sequence circuit diagram for detecting an accident of the transmission line protection relay device of the present invention. In this embodiment, since the cutoff phase of the undervoltage relay having the phase voltage as the input is not required in the configuration of FIG. 1, the output is locked by the cutoff phase detection output, and the undervoltage relay having the phase voltage as the input is locked. In the remaining phase, the ground fault in the protection section during the single-phase reclosing no-voltage time can be cut off.

In FIG. 7, undervoltage relays UV-R, UV-S, and R-phase, S-phase, and T-phase, respectively, receive the respective phase voltages as inputs.
The output of UV-T is used as one input of AND gates 64, 65, 66, and the cutoff phase detection outputs 21, 22, 23 are set to N.
AND gate 6 via OT gates 61, 62 and 63
The other input of 4, 65, 66 is used. The output is one input of an OR gate 68, and the same OR gate 1 as in FIG.
Enter 2 for the other. The subsequent configuration is the same as in FIG.

In the embodiment of FIG. 2, as in the case of FIG. 7, the cutoff phase of the undervoltage relay to which the phase voltage is input is not required. Therefore, the output is locked by the detection of the cutoff phase, and the phase voltage is set to the input. The remaining phase of the undervoltage relay may be configured so that a ground fault in the protection section during the single-phase reclosing no-voltage time can be cut off.

In the embodiment of FIG. 3, as in FIG. 7, the cutoff phase of the undervoltage relay which inputs the phase voltage does not need to be operated. Therefore, the output is locked by the cutoff phase detection, and the phase voltage is input. The remaining phase of the undervoltage relay may be configured so that a ground fault in the protection section during the single-phase reclosing no-voltage time can be cut off.

[0045]

As described above, according to the present invention, even if the line voltage including the disconnection phase is reduced during the single-phase reclosing no-voltage and the undervoltage relay is operated, the three-phase interruption is performed. It is possible to utilize the original single-phase reclosing function without reaching. In addition, by using an undervoltage relay that inputs a phase voltage, the performance can be improved with respect to a ground fault during a single-phase reclosing no-voltage time.

[Brief description of the drawings]

FIG. 1 is a sequence circuit diagram for detecting an accident of a transmission line protection relay device according to an embodiment of the present invention.

FIG. 2 is a sequence circuit diagram for detecting an accident of the transmission line protection relay device according to the second embodiment of the present invention.

FIG. 3 is a sequence circuit diagram for detecting an accident of the transmission line protection relay device according to the third embodiment of the present invention.

FIG. 4 is a vector diagram showing a means for detecting a disconnection phase according to the embodiment of the present invention.

FIG. 5 is a sequence circuit diagram for detecting an accident of the transmission line protection relay device according to the fourth embodiment of the present invention.

FIG. 6 is a sequence circuit diagram for detecting an accident of the transmission line protection relay device according to the fifth embodiment of the present invention.

FIG. 7 is a sequence circuit diagram for detecting an accident of the transmission line protection relay device according to the sixth embodiment of the present invention.

FIG. 8 shows the appearance of a single-phase reclosing circuit and the direction relay of the direction comparison method.
And FIG. 6 is a system diagram showing an example of application of an undervoltage relay.

FIG. 9 is a sequence circuit diagram of an accident detection using an undervoltage relay of a direction comparison method.

FIG. 10 is a vector diagram showing a bus voltage.

[Explanation of symbols]

20 Single-phase reclosing circuit output during no-voltage time 21, 22, 23 Circuit for detecting cut-off phase DI, DO direction relay UV-1, UV-2, UV-3 Undervoltage relay 24, 25, 26 OR gate 27, 28, 29, NOT gate 30, 31, 32, AND gate

Claims (10)

[Claims] An accident detection circuit combining a carrier with a directional relay for detecting whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay receiving line voltage, and a one-line ground fault. In the case of a transmission line protection relay with a single-phase reclosing function that shuts off only the fault phase and re-opens the circuit breaker after the single-phase reclosing no-voltage time, A means for detecting a breaking phase under the condition of the breaking command, and a means for locking the output of the undervoltage relay including the breaking phase based on the breaking phase detection output. 2. An accident detection circuit in which a carrier is combined with a directional relay for detecting whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay that receives line voltage, and a one-line ground fault. In the case of a transmission line protection relay having a single-phase reclosing function that shuts off only the fault phase and re-opens the circuit breaker after the single-phase reclosing no-voltage time, A transmission line protection relay device comprising: means for detecting a breaking phase on condition of a pallet state; and means for locking an output of the undervoltage relay including a breaking phase based on the breaking phase detection output. 3. An accident detection circuit combining a carrier with a directional relay that detects whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay that inputs line voltage, and a one-line ground fault. In the case of a transmission line protection relay with a single-phase reclosing function that shuts off only the accident phase and re-opens the circuit breaker after a single-phase reclosing no-voltage time, A transmission line protection relay device comprising: means for detecting a disconnection phase; and means for locking the output of the undervoltage relay including the disconnection phase based on the disconnection phase detection output. 4. An accident detection circuit in which a carrier is combined with a directional relay that detects whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay that receives a line voltage, and a one-line ground fault. In the case of a transmission line protection relay having a single-phase reclosing function of shutting off only the fault phase and re-closing the circuit breaker after a single-phase reclosing no-voltage time, Means for delaying the output of the undervoltage relay for a predetermined time, and means for making the output of the undervoltage relay instantaneous on condition that there is no output during the single-phase reclosing no-voltage time. Wire protection relay. 5. An accident detection circuit in which a carrier is combined with a directional relay for detecting whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay that receives a line voltage, and a one-line ground fault. In the case of a transmission line protection relay with a single-phase reclosing function that shuts off only the fault phase and re-opens the circuit breaker after the single-phase reclosing no-voltage time, First means for detecting a shut-off phase under the condition of the shut-off command, second means for detecting the elapse of a predetermined time from the single-phase reclosing start, and first means on the condition that there is no detection output from the second means. And a third means for locking the output of the undervoltage relay including the cutoff phase by the cutoff phase detection output of (c). 6. An accident detection circuit combining a carrier with a directional relay for detecting whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay receiving line voltage, and a one-line ground fault. In the case of a transmission line protection relay having a single-phase reclosing function that shuts off only the fault phase and re-opens the circuit breaker after the single-phase reclosing no-voltage time, A first means for detecting a breaking phase on the condition of a pallet state, a second means for detecting elapse of a predetermined time from the start of single-phase reclosing, and a first means on condition that there is no detection output of the second means. And a third means for locking the output of the undervoltage relay including the cutoff phase by the cutoff phase detection output of (c). 7. An accident detection circuit combining a carrier with a directional relay for detecting whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay for inputting a line voltage, and a one-line ground fault. In the case of a transmission line protection relay with a single-phase reclosing function that shuts off only the accident phase and re-opens the circuit breaker after a single-phase reclosing no-voltage time, First means for detecting a disconnection phase;
A second means for detecting the elapse of a predetermined time from the start of the single-phase reclosing circuit, and an output of the undervoltage relay including an interruption phase by a disconnection phase detection output of the first means on condition that there is no detection output of the second means. And a third means for locking the power transmission line. 8. An accident detection circuit combining a carrier with a directional relay for detecting whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay receiving line voltage, and a one-line ground fault. In the case of a transmission line protection relay with a single-phase reclosing function that shuts off only the fault phase and re-opens the circuit breaker after the single-phase reclosing no-voltage time, First means for detecting a cut-off phase under the condition of the cut-off command, second means for locking an output of the undervoltage relay including a cut-off phase by a cut-off phase detection output of the first means, and A third means for locking the output of the undervoltage relay to which a phase voltage is input by the cutoff phase detection output of the means, and an output of either the output of the second means or the output of the third means. And a fourth means for detecting the presence of And a transmission line protection relay device. 9. An accident detection circuit in which a carrier is combined with a directional relay for detecting whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay that receives line voltage, and a one-line ground fault. In the case of a transmission line protection relay having a single-phase reclosing function that shuts off only the fault phase and re-opens the circuit breaker after the single-phase reclosing no-voltage time, First means for detecting a breaking phase on condition of a pallet state, second means for locking an output of the undervoltage relay including a breaking phase by a breaking phase detection output of the first means, and the first means The third means for locking the output of the corresponding phase of the undervoltage relay to which the phase voltage is input by the cutoff phase detection output of the means, and the output of either the output of the second means or the output of the third means is output. Fourth means for detecting that there is A transmission line protection relay device characterized by the above-mentioned. 10. An accident detection circuit in which a carrier is combined with a directional relay that detects whether an accident is an internal direction or an external direction at each terminal of a transmission line, an undervoltage relay that inputs line voltage, and a one-line ground fault. In the case of a transmission line protection relay with a single-phase reclosing function that shuts off only the accident phase and re-opens the circuit breaker after a single-phase reclosing no-voltage time, First means for detecting a disconnection phase;
Second means for locking the output of the undervoltage relay including an interruption phase by the disconnection phase detection output of the first means, and an undervoltage relay receiving a phase voltage by the interruption phase detection output of the first means A third means for locking the output of the phase and a fourth means for detecting the presence of any of the output of the second means or the output of the third means. Transmission line protection relay device.