JPS6152612B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improvement in a directional comparison conveyance protection relay device. Generally, as a carrier protection relay system that protects the power system from accidents, a fault detection relay, an internal fault relay, and an external fault relay are installed at each end of the protected section, and each end transmits data to the power grid. A directional comparison protection relay system is used to protect the In other words, this method uses the carrier signal as a trip prevention signal (in the following explanation, carrier wave transmission is assumed to be sending out a trip prevention signal). to block the blocking signal by opening the
Locks the tripping circuit at the other end. Additionally, when an internal fault relay operates, the transmitter circuit is shorted and transmission is stopped. After all, the tripping command circuit is established when the following conditions are met: when the internal directional relay is activated, when the external directional relay is not activated, and when no blocking signal is received. In addition, this method is based on the carrier signal transmission method, (a)
There are two main types: (b) continuous transmission method and (b) constant transmission method. The former (a) is a method in which carrier wave transmission is stopped at all times and when there is no external failure, and the carrier wave is transmitted upon detection of a failure based on, for example, voltage drop. The latter (b) is a method that transmits a carrier wave at all times and when an external failure occurs, and stops transmitting the carrier wave when an internal failure is detected. In the former (a), the tripping circuit is formed by the AND conditions of failure detection, no carrier wave reception from the other end, and no external failure detection. On the other hand, the latter (b) is formed by an AND condition of internal failure detection and no carrier wave reception from the other end. These methods include a same frequency method in which the same frequency is used as the frequency of each terminal, and a different frequency method in which different frequencies are used as the frequency of each terminal, and the following four combinations are possible. (1) Same-frequency fault transmission method (2) Always-on transmission method (3) Different-frequency fault transmission method (4) Always-on transmission method By the way, in general, in a power transmission system, one end reliably supplies fault current when a fault occurs. However, it must be taken into consideration that the other end is a non-power supply end that does not supply fault current. In this case, a non-power supply countermeasure circuit is provided at the non-power supply end according to the failure detection conditions due to system failure. This non-power supply countermeasure circuit is a countermeasure circuit that can perform external failure detection at the non-power supply end, but cannot detect a failure because no fault current flows when an internal failure occurs. Normally, this consists of the operation of a failure detection relay such as an undervoltage relay and the non-operation of an external failure relay, which is treated as equivalent to internal failure detection. In this case, in the constant transmission method, the carrier wave is always transmitted, so even if a non-power countermeasure circuit is inadvertently configured due to a failure in the voltage transformer circuit, for example, there will be no malfunction, but in the case of the failure transmission method, When a voltage transformer circuit malfunctions, it immediately leads to malfunction.
In other words, considering the above, it is better to compare directions using the constant transmission method. However, in the case of a multi-terminal system, in the same frequency constant transmission method (2), even if the carrier wave of one terminal is stopped, the carrier wave cannot be stopped due to wraparound from other terminals, so there is a problem that carrier wave stoppage inspection cannot be performed. occurs. In addition, in the case of (4), where different frequencies are constantly transmitted, inspection is possible, but the problem arises that the operation sequence becomes complicated.
Therefore, in the past, taking the above points into consideration, we took advantage of the continuous transmission method and the failure transmission method, and used the same frequency,
As a system that can be applied to any of the different frequencies, a method is used in which the power supply end is always sent out and the non-power end is sent out in the event of a failure. Next, a conventional direction comparison carrier protection relay device using such a system will be described in the case of the same frequency and different frequencies. First, Figure 1a shows the configuration in the case of the same frequency system, where 1 is the power supply terminal, 2 is the non-power supply terminal, and the power transmission line 3 connects both terminals 1 and 2 to the terminal side. It is interconnected via disconnectors 4A and 4B. In the following explanation, power supply end 1 will be referred to as A terminal,
Further, the non-power terminals 2 are respectively referred to as B terminals. 5A, 5
B is a current transformer that detects the current on each terminal A and B side,
6A and 6B are voltage transformers that similarly detect voltage. 7A, 7B are each transformer 5A, 6A, 5B,
6B is an internal failure detection relay that receives the output signal and detects an internal failure; 8A and 8B are external failure detection relays that similarly detect external failures; 9
Reference numerals A and 9B are failure detection relays that receive the output signals of the voltage transformers 6A and 6B and detect failures caused by voltage drop or the like. 10A and 10B are terminals SPA,
The transmitter 10A of the carrier device has SNA1, SNA2, SPB, SNB1, and SNB2 and sends out carrier waves, and the transmitter 10A always sends out signals depending on whether the terminals are open or short-circuited. The transmitting section 10B controls carrier wave transmission or carrier wave transmission stop so as to adopt a transmission method in the event of a failure. That is, in the transmitting sections 10A and 10B of each terminal 1 and 2, transmission and stop are controlled as shown in the table below.

[Table] Reference numerals 11A and 11B are carrier device receiving sections that include receiving relays 12A and 12B that receive both carrier signals of terminals 1 and 2, respectively. Moreover, this transmitter 10A,
The receiving section 11A is connected to the power transmission line 3 via a coupling capacitor 13A, and the transmitting section 10B and the receiving section 11B are connected to the power transmission line 3 via a coupling capacitor 13B.
Furthermore, each terminal SPA of the transmitter 10A on the A terminal 1 side,
A normally open contact 7A _a1 of an internal failure detection relay 7A is provided between SNA2, and a normally closed contact 8A _b of an external failure detection relay 8A and a normally closed contact 9A _b of an external failure detection relay 9A are provided between each terminal SPA and SNA1. are installed in series. On the other hand, the normally closed contact 9B b of the failure detection relay 9B and the normally closed contact 8B _b1 of the external failure detection relay 8B are provided in series between each terminal SPB and _SNB1 of the transmitter 10B on the B terminal 2 side, and each terminal SPB, SNB2
Between them is the normally open contact 7B a of the internal failure detection relay 7B _.
In addition, a normally open contact 14B _a1 of an auxiliary relay 14B, which will be described later, is provided via the contact 8B _b1 . Fig. 1b shows the configuration of the trip circuit on the A terminal 1 side, where P _A is the control power supply bus and normally open contact 7A _a2 of internal failure detection relay 7A,
The normally closed contact _12Ab of A is connected in series to output a trip command. Figure 1c also shows the configuration of the trip circuit on the B terminal 2 side, where P _B and N _B are control power supply buses, and between these two buses P _B and N _B there is a failure detection relay 9.
A normally open contact 9B _a of B and an auxiliary relay 14B are connected in series. In addition, a series circuit of the normally open contact 14B _a2 of the auxiliary relay 14B, the normally closed contact 12B _b of the receiving relay 12B, and the normally closed contact 8B _b2 of the external failure detection relay 8B is connected to one control power supply bus P _B to trip I am trying to output commands. In such a configuration, a carrier wave is normally transmitted only from the transmitter 10A on the A terminal 1 side, which is received by the receivers 11A and 11B on the terminals 1 and 2, respectively, and the receiving relays 12A and 12B operate, respectively. The normally closed contacts 12A _b and 12B _b are open.
Therefore, even if a secondary output failure occurs in the voltage transformer 6B of the B terminal 2 and the failure detection relay 9B is activated and the contact 14B _a2 is closed, a trip circuit will not be formed and will not be disconnected immediately. . On the other hand, A terminal 1
When a similar failure occurs in the voltage transformer 6A, the failure detection relay 9A operates, but since its conditional contact is not involved in the trip condition of the A terminal 1, it will not be erroneously disconnected. Next, when an internal failure occurs, the internal failure detection relay 7A operates at the A terminal 1, closes its normally open contact 7A _a1 , and stops transmitting the carrier wave. On the other hand, at B terminal 2, internal failure detection relay 7B
does not operate, but failure detection relay 9B operates, its normally open contact 9B _a closes, and auxiliary relay 14B is energized. Then, due to the operation of this auxiliary relay 14B, its normally open contact 14B _a1 is closed, so
The carrier wave stop is continued by these contacts 14B _a1 and 8B _b . Therefore, carrier wave transmission from both terminals 1 and 2 is stopped, and on the A terminal 1 side, contacts 7A _a2 ,
A trip circuit is formed by 12A _b and contacts 14B _a2 , 12B _b , and 8B _b on the B terminal 2 side, and a trip command is sent out to perform a protective operation. Further, when an external failure occurs at the B terminal 2, the internal failure detection relay 7A operates on the A terminal 1 side, and the carrier wave transmission is stopped as described above. However, on the other B terminal 2 side, the external failure detection relay 8B operates and its normally closed contact 8
When B _b1 is opened, a carrier wave is transmitted from the transmitter 10B of the B terminal 2. This carrier wave is received by receiving sections 11A and 11B of each terminal 1 and 2, respectively, and thereby reception relays 12A and 12B
In order to continue its operation, its normally closed contact 12A
_b , 12B _b is opened. Therefore, even if the contact 7A _a2 at the A terminal 1 and the contact 14B _a2 at the B terminal 2 are closed, a trip circuit is not formed and will not be broken due to an external failure. Figure 2 a, b, and c show the circuit configuration in the case of different frequency system. I will only describe the parts. That is, in place of the receiving relays 12A and 12B of the A terminal 1 and the B terminal 2, receiving relays 15A and 15B are provided which receive only carrier waves transmitted from the opposite ends 2 and 1, respectively. Further, in place of the contacts 12A _b and 12B _b of the trip circuit of each terminal 1 and 2, normally closed contacts 15A _b and 15B _b of the receiving relays 15A and 15B are provided, respectively. Furthermore, in the carrier wave transmitting circuit of the B terminal 2, the normally open contact 15B _a of the receiving relay 15B is connected in series with the contact 9B _b , and the contact 14
Normally closed contact 15B of receiving relay 15B in series with B _a1
This is a new version of _b2 . In this configuration, a carrier wave is normally transmitted only from the transmitter 10A on the A terminal 1 side, and is received only by the receiver 11B on the B terminal 2 side, and the reception relay 15B operates to transmit its normally closed contact 15B _b1. is open. Therefore, voltage transformer 6 of B terminal 2
Even if a secondary output failure occurs in B, the failure detection relay 9B malfunctions and the contact 14B _a2 closes, a trip circuit is not formed and no error or disconnection occurs. On the other hand, if a similar failure occurs in the voltage transformer 6A of the A terminal 1, the failure detection relay 9A will operate, but since its conditional contact is not involved in the trip condition, there will be no error or disconnection. Next, when an internal failure occurs, the internal failure detection relay 7A operates at the A terminal 1, closes its normally open contact 7A _a1 , and stops the conveyance path. On the other hand, at B terminal 2, internal failure detection relay 7B does not operate, but failure detection relay 9B operates, its normally open contact 9B _a closes, and auxiliary relay 14B is energized. Then, due to the operation of this auxiliary relay 14B, its normally open contact 14B _a1 is closed, and due to the stop of the carrier wave from the A terminal 1, the reception relay 15B becomes inoperable, and its normally closed contact 15B _b2 is closed, and further external failure detection relay 8B Since it is inoperative, its normally closed contact 8B _b1 is closed, so that the carrier wave on the B terminal 2 side continues to be stopped. Therefore, the carrier wave transmission from both terminals 1 and 2 is stopped, and on the A terminal 1 side, the contacts 7A _a2 and 15A _b , and on the B terminal 2 side, the contacts 14B _a2 , 15B _b1 , and 8B _b2
A trip circuit is formed, a trip command is sent out, and a protective operation is performed. In addition, when an external failure occurs at B terminal 2, A terminal 1
On the other hand, the internal failure detection relay 7A operates and stops transmitting the carrier wave in the same manner as described above. but,
On the other B terminal 2 side, the external failure detection relay 8B is operated and its normally closed contact 8B _b1 is opened, thereby transmitting a carrier wave from the transmitter 10B of the B terminal 2. This carrier wave is received by the receiving section 11A of the A terminal 1, thereby operating the receiving relay 15A and opening its normally closed contact 15A _b . Note that in this failure case, the external failure relay 8B operates earlier than the internal failure detection relay 7A. In other words, when contact 7A _a2 closes, contact 15A _b is already open, so
No trip circuits are formed and no errors or disconnections occur due to external failures. The above has described the direction comparison conveyance protection relay device using the conventional method, but in reality, the pallet of the shear break is amplified and the direction comparison in this relay device is performed by comparing it with the first stage shear break of the distance relay. Since this is done by combination, as shown in Figure 3 a, b and c,
The pallet contact amplifier circuits of the respective disconnectors 4A and 4B are connected in parallel to the transmitting circuits of the terminals 1 and 2 (hereinafter, the different frequency system shown in Fig. 2 will be described as an example). It is something that exists. In other words, Figure 3c
, P and N are the control power bus lines, 4B _a and 4A _a are the pallet contacts of the wire breakers 4B and 4A of each terminal 2 and 1, and the connection between the control power bus lines P and N is made through the auxiliary relays 16B and 16A in series. is connected to. Figure 3b
[a] shows the actual configuration of the transmitting circuit at each terminal 2, 1, and the contacts 7B _a and 7A _a in Fig. 2a
Normally closed contacts _{16B b} and 16A _b of auxiliary relays 16B and 16A are connected in parallel with auxiliary relays 16B and 16A, respectively. Further, FIGS. 4a, b, and c are equivalent representations of the power transmission system of FIG. 2a for convenience of explanation. In the figure, 17 is a transformer, and 18 is a disconnector. In this configuration, as shown in FIG. 4a, both the sheath disconnectors 4A and 4B are normally in the closed state, and the system is in operation. In such a state, for example, if an on-site accident occurs on the B terminal 2 side, the external fault detection relay 8B operates at the B terminal 2, and its normally closed contact 8 _b1 opens, thereby causing the B terminal to open. A carrier wave is transmitted from the second transmitter 10B. This carrier wave is received by the receiving section 11A of the A terminal 1, thereby operating the receiving relay 15A and opening its normally closed contact 15A _b . on the other hand,
At the A terminal 1, the internal failure detection relay 7A operates, and its normally open contact 7A _a2 is closed. However, at this point, the contact 15A _b is already open, so no trip circuit is formed and no error or disconnection occurs. On the other hand, due to the occurrence of an on-site accident at the B terminal 2, a trip command for the breaker 4B at the B terminal 2 is outputted by the operation of a bus protection relay device (not shown). As a result, the pallet contact 4B _a is opened and the auxiliary relay 16B is deenergized, and the normally closed contact 16B _b is closed, thereby stopping carrier wave transmission from the B terminal 2. Also,
When the main contact is opened, the circuit breaker 4B is tripped and the accident is canceled, thereby causing the internal failure detection relay 7A of the A terminal 1 to return to its normal state. In this case, if the carrier wave of B terminal 2 is stopped earlier than the return of internal failure detection relay 7A _of A terminal 1, contact 15A
_b will be closed, and A terminal 1 will be mistaken or disconnected. This situation is shown in FIG. 5. In Figure 5, t ₁ is the time required from the opening of the edge breaker (CB) pallet contact (SW) to the opening of the edge breaker (CB) main contact, and t ₂ is the time required for the edge breaker (CB) to open. The time required for the auxiliary relay 16B to return after the pallet contact (SW) opens, and the _time required for the internal fault detection relay 44SI to return after the main contact of the breaker (CB) opens. It shows. In this case, in order to prevent such errors and disconnections, the stop of the carrier wave at the B terminal 2 should be delayed from the return of the internal failure detection relay 7A at the A terminal 1, that is, t ₂ > t ₁ in Fig. 5. The contact points 16B _b may be time-coordinated so that the relationship is +t ₃ . Next, in the state shown in FIG. 4b after the accident repair, when a closing command is given to the shield breaker 4B by a closing circuit (not shown) as shown in FIG. An excitation inrush current (hereinafter referred to as inrush current _Ioh ) flows.
As a result, the internal failure relay 7A malfunctions at the A terminal 1, and its normally open contact 7A _a2 is closed. On the other hand, at B terminal 2, the external failure detection relay 8B operates and its normally closed contact 8B _b1 opens, but at this point the auxiliary relay 16B is in the process of operating again, so its normally closed contact 16B _b is still open. The circuit is closed. Therefore, the terminals SPB of the transmitter 10B,
Since the SNB 2 is short-circuited by the contact 16B _b , no carrier wave is transmitted from the B terminal 2. Therefore, the reception relay 15A of A terminal 1 does not operate,
Since the normally closed contact _15Ab is closed, a trip circuit is formed by the contacts _7Aa2 and _15Ab , and the A terminal 1 is accidentally disconnected. This situation is shown in FIG. 6. In Fig. 5, t ₄ is the time required from the time when the armature breaker (CB) pallet contact (SW) closes until the auxiliary relay 16A returns, and t ₅ is the time required when the armature breaker (CB) pallet contact (SW) After the internal failure detection relay 44SI is closed,
This shows the time required for each to operate. In this case, in order to prevent such errors and disconnections, the carrier wave transmission at the B terminal 2 should be made faster than the operation of the internal failure detection relay 7A at the A terminal 1. In other words, in FIG. 6, t ₄ < Configure the pallet amplifier circuit of Nishiya breaker 4B so that _t5 , and contact 16B
What is necessary is to try to coordinate the time of _b . However, since the operating time or recovery time of the pallet generally varies depending on the breaker, it is difficult to achieve the above-mentioned time coordination using an auxiliary relay for amplification. If this is not done, there is a drawback that mistakes or cuts may occur as mentioned above. Note that the same applies to the same frequency system. The present invention has been made in view of the above circumstances, and includes a direction determining relay and a fault detection relay provided at each end of a power system consisting of a power supply terminal on one side and a variable power supply terminal on the other, and mutual communication between each end. In a direction comparison carrier protection relay device that mutually transmits carrier wave signals to protect the power system, carrier wave transmission at the variable power supply end is stopped on condition that the carrier wave signal from the power supply end is received. Unpause,
In addition, by stopping carrier wave transmission at the own end after a predetermined period of time on the condition that no carrier wave is received from the power supply end, it is possible to prevent the disconnection from opening due to an accident on the premises of the variable power supply end, or to prevent the end of the power supply from being disconnected. It is an object of the present invention to provide a highly reliable directional comparison transfer protection relay device that can reliably protect the power system by preventing errors or disconnections on the power supply end side due to the excitation inrush current of the rear transformer when the transformer is turned on. purpose. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIGS. 7a, b, and c show the configuration of a different frequency type direction comparison transport protection relay device, and the same parts as in FIGS. Only the different parts will be described here. That is, in this embodiment, the above-mentioned auxiliary relays 16B and 16A are provided in parallel with the contacts 7B _a and 7A _a1 of the transmission circuit on the terminals 1 and 2 side of FIG. 2a.
The normally closed contacts 16B _b and 16A _b of the time-limited return relays 19B and 19A, which will be described in detail later, are newly connected in series to the normally closed contacts 16B _b and 16A _b . FIG. 8 shows the configuration of the carrier wave transmission condition circuit, where P ₁ and N ₁ are control power supply buses, 19B and 19A are time-limited return relays, and reception relays 15B and 15
The normally open contacts 15B _a1 and 15A _a of A are connected in series between the control power supply buses P ₁ and N ₁ . Here, the time limit of the time limit return relays 19B and 19A is
t ₂ and t have a time satisfying t ₂ >t ₁ +t ₃ in FIG. 5 described above. That is, it has a time _t2 corresponding to at least the time required from the time of operation of the internal failure detection relay 7A to the time of recovery. Next, the operation of the direction comparison transport protection relay device of the different frequency type having such a structure will be described with reference to FIGS. 9a, b, and c. First, as shown in FIG. 9a, the circuit breakers 4A and 4B at each terminal 1 and 2 are normally closed, so the contact 16A _b of the transmitting circuit at each terminal 1 and 2
16B _b is open. Further, the carrier wave is transmitted only from the transmitting section 10A of the A terminal 1, and only the receiving section 11B of the B terminal 2 side receives the carrier wave, and the receiving relay 15B operates and its normally closed contact 15B _b1 is opened.
Further, the normally open contacts 15B _a1 and 15B _a are each closed. Therefore, for example, the voltage transformer 6 of the B terminal 2
Even if a secondary output failure occurs in B, the failure detection relay 9B malfunctions and the contact 14B _a2 closes, a trip circuit is not formed and no error or disconnection occurs. On the other hand, if a similar failure occurs in the voltage transformer 6A of the A terminal 1, the failure detection relay 9A will operate, but since its conditional contact is not involved in the trip condition, there will be no error or disconnection. Next, when an internal failure occurs, the internal failure detection relay 7A operates at the A terminal 1, and closes its normally open contact 7A _a1 to stop the carrier wave. On the other hand, at B terminal 2, internal failure detection relay 7B does not operate, but failure detection relay 9B operates, its normally open contact 9B _a closes, and auxiliary relay 14B is energized. The operation of this auxiliary relay 14B causes the normally open contact 14B _a1 to close, and the stop of the carrier wave from the A terminal 1 causes the receiving relay 15B to become inoperable, causing the normally closed contact 15B _b2 to close, and further external failure detection relay 8B Since it is inoperative, its normally closed contact 8B _b1 is closed, so that the carrier wave on the B terminal 2 side continues to be stopped. Therefore, carrier wave transmission from both terminals 1 and 2 is stopped, and the trip circuit is activated by contacts 7A _a2 and 15A _b on the A terminal 1 side, and through contacts 14B _a2 , 15B _b , and 8B _b2 on the B terminal 2 side. is formed, a trip command is sent out, and a protective operation is performed. In addition, when an external failure occurs at B terminal 2, A terminal 1
On the other hand, the internal failure detection relay 7A operates and stops transmitting the carrier wave in the same manner as described above. but,
On the other B terminal 2 side, the external failure detection relay 8B is operated and its normally closed contact 8B _b1 is opened, thereby transmitting a carrier wave from the transmitter 10B of the B terminal 2. This carrier wave is received by the receiving section 11A of the A terminal 1, thereby operating the receiving relay 15A and opening its normally closed contact 15A _b . Note that in this failure case, the external failure relay 8B operates earlier than the internal failure detection relay 7A, that is, the contact 15A _b is already open when the contact 7A _a2 is closed.
No trip circuits are formed and no errors or disconnections occur due to external failures. Next, a case will be described in which an on-premises accident occurs at B terminal 2. During normal operation, for example, if an on-site accident occurs on the B terminal 2 side, the external failure detection relay 8B operates at the B terminal 2, and its normally closed contact 8B _b1 opens, causing the B terminal 2 A carrier wave is transmitted from the transmitter 10B. This carrier wave is received by the receiving section 11A of the A terminal 1, thereby operating the receiving relay 15A and opening its normally closed contact 15A _b . On the other hand, at the A terminal 1, the internal failure detection relay 7A operates and its normally open contact 7A _a2 is closed. However, at this point, the contact 15A _b is already open, so no trip circuit is formed and no error or disconnection occurs. On the other hand, due to the occurrence of an on-site accident at the B terminal 2, a trip command for the breaker 4B at the B terminal 2 is outputted by the operation of a bus protection relay device (not shown). As a result, the pallet contact 4B _a is opened, the auxiliary relay 16B is deenergized, the normally closed contact 16B _b is closed, and the main contact is opened, the breaker 4B is tripped, and the accident is canceled. , the internal failure relay 7A of A terminal 1 starts to recover. In this case, when the contact 16B _b is closed while the internal failure detection relay 7A of the A terminal 1 is returning, carrier wave transmission from the B terminal 2 is stopped and the contact 15
A _b is closed and disconnected due to an error, but the reception relay 15B becomes inoperable due to the operation of the internal failure detection relay 7A described above, and even if its contact 15B _a1 is opened and the time-limited return relay 19B is deenergized, Its normally closed contact 1
9B _b remains open until t ₂ hours have elapsed. Therefore, at this point, the carrier wave is continuously transmitted from the B terminal 2 to the A terminal 1, and the receiving relay 15A receives this and operates, and its normally closed contact 15A
_b is still open circuit. Then, eventually the internal failure detection relay 7A returns and its normally open contact 7A
Since _a2 is opened, the time-limited return relay 19B is deenergized, and after ₂ hours _, its normally open contact 19B _b is closed _. Since the circuit is open as described above, a trip circuit is not formed and the disconnector 4A is never disconnected. Next, a case will be described in which the sheath breaker 4B is closed by a closing circuit (not shown) as shown in FIG. 9(c) in the state shown in FIG. 9(b) after an accident has been repaired. In this case, first, a carrier wave is sent out from the transmitter 10A of the A terminal 1, and the receiving relay 15B of the B terminal 2 receives it and operates, and then the normally open contact 10A of the carrier wave is sent out.
The time-limited return relay 19B is operated by the closing of 5B _a1 , and the contact 19B _b is opened. In such a state, if the circuit breaker 4B is turned on now, an inrush current _Ioh from the transformer 17 will flow. As a result, the external failure detection relay 8B operates at the B terminal 2, and as soon as its normally closed contact 8B _b1 is opened, the terminals SPB and SNB1 of the transmitter 10B are opened, and the carrier wave is transmitted from this to the A terminal 1. sent to. When this carrier wave is received by the receiving section 11A of the A terminal 1, the receiving relay 15A is activated and its normally closed contact 15A _b is opened. Eventually, the internal failure detection relay 7A of the A terminal 1 malfunctions due to the inrush current _Ioh , and its normally open contact 7A malfunctions.
_a2 is closed, but at this point the contact _15Ab is already open due to the above-described operation, so no trip circuit is formed and the circuit breaker 4A is never disconnected. In this way, internal failure detection relays 7A, 7B and external failure detection relays 8A, 8B are installed at each end of the two-terminal power system consisting of power supply terminal 1 and non-power supply terminal 2.
and failure detection relays 9A and 9B are provided, and carrier wave signals as trip prevention signals are transmitted between each terminal 1 and 2, and on the power supply end 1 side, the operation of the internal failure detection relay 7A and the operation of the internal failure detection relay 7A from the non-power supply end 2 side are In a different frequency type directional comparison carrier protection relay device that trips a disconnector when a carrier wave signal is not received to protect the power system, the carrier wave signal from the power source end 1 is transmitted on the non-power end 2 side. On the condition that the carrier signal is received, the stop of the carrier wave at the own end is canceled, and on the condition that no carrier wave signal is received from the power source end 1, the time-limited return relay 19B operates at least the internal failure detection relay 7A of the power source end 1. After the time t ₂ required for recovery from start to finish has elapsed, carrier wave transmission at its own end is stopped. Therefore, as in the conventional case, the transmission or stopping of the carrier wave to the power supply terminal 1 is performed only according to the operation/return conditions of the pallet contact amplifier circuit of the current terminal (non-power supply terminal 2) and the disconnector 4B. This can be done in combination with the conditions of whether or not a carrier signal is received from the power supply end 1 as described above, so the operation time or recovery time of the pallet of the shield breaker 4B varies. This prevents accidents on the premises of the non-power source end 2 due to time miscoordination caused by the power source end 2, or errors or disconnections on the power end 1 side due to inrush current when the back transformer 17 on the non-power end 2 side is turned on. The system can be reliably protected from accidents. Note that the present invention is not limited to the above embodiments. (1) In the above embodiment, the case of different frequency systems has been described, but it can be implemented in exactly the same way even in the case of the same frequency system. (2) In the above embodiment, the case where the B terminal 2 is a non-power supply terminal has been described, but it can be implemented in exactly the same way even when the B terminal 2 is a variable power supply terminal. (3) In the above embodiment, the time-limited return relay 19B having a time limit _t2 is used, but the present invention is not limited to this, and an auxiliary relay that can maintain the return for the time limit _t2 may also be used. It can be implemented similarly. In addition, the present invention can be implemented with various modifications without changing the gist thereof. As explained above, according to the present invention, a direction discrimination relay and a failure detection relay are provided at each end of a power system consisting of a power supply end on one side and a variable power supply end on the other, and carrier wave signals are transmitted between each end. In a directional comparison carrier protection relay device designed to protect a mutual power system, on the condition that the variable power supply terminal receives a carrier wave signal from the power supply terminal, it releases the carrier wave stop at its own terminal, and Under the condition that no carrier wave reception is detected at the variable power source end, the carrier wave transmission at the variable power end is continued at least for the time required to recover from the operation of the internal faulty relay as a direction discriminating relay at the power source end. To reliably protect the power system by preventing the disconnection from opening due to an accident on the premises, or by preventing the power supply end from being erroneously or disconnected due to the excitation inrush current of the rear transformer when the disconnector at the end is closed. It is possible to provide a highly reliable directional comparison transport protection relay device that can perform

[Brief explanation of the drawing]

Fig. 1 a, b, c and Fig. 2 a, b, c are block circuit diagrams showing the configuration of a conventional direction comparison transport protection relay device using the same frequency and different frequency methods, and Fig. 3 a, b, c 4 is a diagram showing the configuration of a conventional carrier wave transmission condition circuit, FIGS. 4a, b, and c are diagrams for explaining the operations in FIGS. 2a, b, and c, and FIGS. 7a, b and c are block configuration diagrams showing one embodiment of the direction comparison conveyance protection relay device of the present invention, and FIG. 8 is a time chart shown in FIGS. 7a, b and c. FIGS. 9a, b, and c are diagrams for explaining the operations in FIGS. 7a, b, and c. FIGS. 1...Power supply end, 2...Non-power supply end, 3...Power transmission line, 4A, 4B...Shipping breaker, 5A, 5B...Current transformer, 6A, 6B...Voltage transformer, 7A, 7
B...Internal failure detection relay, 8A, 8B...External failure detection relay, 9A, 9B...Failure detection relay, 10A, 10B...Transmission section, 11A, 11B
... Receiving section, 12A, 12B, 15A, 15B...
...Reception relay, 13A, 13B...Coupling capacitor, 14A, 14B...Auxiliary relay, 16A, 1
6B...Auxiliary relay, 17...Transformer, 18...
Shuya disconnector, 19A, 19B...Timed return relay,
7A _a1 , ₂ ...7A contact, 7B _a ...7B contact,
8A _b ...8A contact, 8B _b1 , ₂ ...8B contact,
9A _b ... 9A contact, 9B _a , _b ... 9B contact,
12A _b ...Contact of 12A, 12B _b ...Contact of 12B, 14B _a1~3 ...Contact of 14B, 15A _b ...
...15A contact, 15B _b1 , ₂ ...15B contact,
16A _b ... Contact of 16A, 16B _b ... Contact of 16B, 19B _b ... Contact of 19B, P, N, P ₁ ,
N ₁ , P _A , P _B ... Control power bus.

Claims (1)

[Claims] 1. In a power system consisting of a power supply terminal on one side and a variable power supply terminal on the other, an internal failure relay and an external a fault relay, a fault detection relay that is provided at each of the power supply terminal and the variable power supply terminal and detects a fault in the power system; and a fault detection relay that is provided at the power supply terminal and is activated when the internal fault relay of the power supply terminal is not operated a first carrier device that sends a carrier wave signal as a disconnection prevention signal to the variable power supply end; a second carrier for transmitting the carrier wave signal to the power supply terminal when the faulty relay is inoperable and at least the external faulty relay of the variable power supply terminal is operating, and for stopping the transmission of the carrier wave signal by opening the breaker; and a second device provided at the power source end that trips the breaker of the power source end on the condition that the carrier wave signal from the second carrier device is not received when the internal fault relay of the power source end is operated. 1, and a device provided at the variable power source end,
on the condition that the external fault relay of the variable power supply end is inoperative and the carrier wave signal from the first carrier device is not received when the fault detection relay of the variable power supply end is activated. A second device for tripping the disconnector, and a stop of the carrier wave signal transmission of the second carrier device by opening the disconnector at the variable power supply end, and a signal indicating that the carrier wave signal from the first carrier device has been received. blocking the transmission of the carrier wave signal from the second carrier device when the variable power source end is turned on and the carrier wave signal from the first carrier device is not received. A direction comparison conveyance protection relay device, characterized in that it is configured to include a third device for permitting.