JP2009118642A - Protection relay system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a protection relay system which can continuously play a role as a protection relay device even in the middle of the replacement of a component by restoring an abnormality region of a failure device. <P>SOLUTION: When a first device fails, a contact point 12 is closed and a current flows to a coil 25, a contact point 7a is opened, and a contact point 7b is closed. In a second device at a sound side, a blocker can be tripped since AND conditions at contact points 21a, 21b can be established. In this state, when drawing out the first device from an accommodation box for the repair of failure, the contact point 12 disappears, and the contact points 7a, 7b are returned to opening/closing states in the sound time of the first device. A single protection operation becomes impossible in the second device. For this reason, the mechanical component 13 for maintaining a current passage even in a state where the first device is drawn out is arranged at the accommodation box side in order to maintain the passage of a drive current of the coil 25 formed by the closing operation of the contact point 12 even after the first device is drawn out. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a protective relay system in which a plurality of protective relay devices that protect devices and transmission / distribution lines arranged in an electric power system are exchangeably accommodated in one housing.

  The protection relay device determines whether or not there is a failure in the protection target by calculation using the voltage and current of the power system where the protection target exists, and controls the circuit breaker that disconnects the protection target from the power system based on the determination result. It is a device that protects a protection target.

  In this protective relay device, when a hardware or software abnormality occurs, the device abnormality can be detected by the self-monitoring function, and an external device such as a monitoring panel can be notified of the device failure.

  In addition, in an electric station such as a substation, a protection relay system in which a plurality of protection relay devices are exchangeably accommodated in one housing is used so that a plurality of protection objects can be protected from one place. .

JP-A-6-189447

  However, in the conventional protective relay device, the role of the protective relay device is taken until the faulty device is taken out from the storage case, left to the repair work of the faulty part, and mounted again in the storage case and recovered. Therefore, in the unlikely event that an accident occurs in the power system, there is a problem that the power outage range is expanded.

  The present invention has been made in view of the above, and is a protective relay capable of continuing to serve as a protective relay device even during the work of repairing and replacing an abnormal part of a faulty device. The purpose is to obtain a power system.

In order to achieve the above-described object, the present invention is arranged such that each of the output circuits can be individually replaced in the housing, and each output circuit is used for outputting a trip command when the apparatus is healthy. And two protective relay devices including two or more protective relay devices including a third contact used for output of a device failure at the time of a device failure, when the same protection target is separately and separately protected in parallel. When both devices are healthy, a trip signal is output to the outside when an AND condition is established by each of the first contacts, and when one device fails, the third contact of the failed device is connected to the outside. In addition to outputting a failure signal, a current path is formed so that a trip signal can be output to the outside when the AND condition is established by the first and second contacts in the other healthy device In the above-described protection relay system, in a state where the protection relay device is mounted at the location of each protection relay device in the housing, the current contact can be opened and closed by the third contact In a state where the protective relay device is not mounted, a mechanical component is attached to maintain the current path formed when the third contact is present in a closed state. And

  According to the present invention, in the two protective relay devices that separately and independently protect the same protection object, the circuit breaker is tripped when the AND condition is established between the first contacts of both when the both are healthy. When one of the protective relay devices fails, a current is such that an AND condition is established between the first contact and the second contact of the sound-side protective relay device at the third contact point of the faulty device. By forming the path, it is possible to perform independent protection with the protective relay device on the sound side. Then, when the faulty device is removed from the housing to replace the faulty device, the mechanical component maintains the current path formed by the third contact point in the faulty device. Protection can be continued. In this way, even during the operation of repairing and replacing the abnormal part of the faulty device, the effect as a protective relay device can be continued.

  Exemplary embodiments of a protective relay system according to the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG.
1 is a block diagram showing a configuration of a protective relay system according to Embodiment 1 of the present invention. As shown in FIG. 1, the protection relay system according to the first embodiment includes a protection relay device 1 and a protection relay device 2 in each arrangement unit provided in a grid pattern on a protection panel 4 that is a housing. The auxiliary relay 3 is mounted so as to be exchangeable.

  The protection relay devices 1 and 2 independently determine whether there is a failure in the protection target by calculation using the voltage / current of the power system in which the protection target (equipment or transmission / distribution line arranged in the power system) exists. Based on the judgment result, the protection target is protected by controlling a circuit breaker (not shown) that separates the protection target from the power system. In the process, the normality of hardware and software is diagnosed by the self-diagnosis function of each. The diagnosis result is output to an external device such as a monitoring panel.

  Here, in FIG. 1, the protective relay device 1 is shown as a first device, and the protective relay device 2 is shown as a second device because the first device and the second device are a set. It shows that the same protection object is protected separately. That is, between the protection relay device 1 in the left one row and the protection relay device 2 in the right one row, for example, two mounted in the arrangement unit adjacent to each other form a set, and the same protection object is separated and independent To protect. In this case, the output unit for the circuit breaker and the external device formed by the two protective relay devices is configured as shown in FIG. 2, for example.

  FIG. 2 is a circuit diagram showing a configuration of an output unit when the first device and the second device arranged in different units in the protection relay system shown in FIG. 1 separately protect the same protection object. In FIG. 2, contacts 7 a and 7 b are contacts that perform switching operations opposite to each other at the time of soundness and failure diagnosed by the self-diagnosis function of the protective relay device 1. Is done. When the protective relay device 1 is healthy, the contact 7a performs a closing operation, and the contact 7b performs an opening operation. At the time of failure of the protective relay device 1, the contact 7a performs an opening operation, and the contact 7b performs a closing operation.

  The contacts 8 a and 8 b are contacts that perform switching operations opposite to each other at the time of soundness and failure diagnosed by the self-diagnosis function of the protective relay device 2, and are energized and deenergized by the coil 26. When the protective relay device 2 is healthy, the contact 8a performs a closing operation and the contact 8b performs an opening operation. At the time of failure of the protective relay device 2, the contact 8a performs an opening operation, and the contact 8b performs a closing operation.

  The output circuit 10 of the protective relay device 1 includes contacts 11a and 11b that are first and second contacts and a contact 12 that is a third contact. The contacts 11a and 11b are contacts that are energized and de-energized by a coil (not shown) that is driven according to the result of the normality judgment of the protection target that is performed when the protection relay device 1 is healthy. The contacts 11a and 11b perform an opening operation when the protection target is normal, and perform a closing operation by a trip command output when the protection target is abnormal.

  The contact 12 is energized and deenergized by a coil (not shown) whose drive current is controlled to be turned on and off according to a healthy state and a failure state diagnosed by the self-diagnosis function of the protective relay device 1. The contact 12 performs an open circuit operation when the protective relay device 1 is healthy, and performs a close circuit operation when the protective relay device 1 is faulty.

  The output circuit 20 of the protective relay device 2 includes contacts 21a and 21b that are first and second contacts, and a contact 22 that is a third contact. The contacts 21a and 21b are contacts that are energized and de-energized by a coil (not shown) that is driven according to the result of the normality judgment of the protection target performed by the protection relay device 2 when the device is healthy. The contacts 21a and 21b perform an opening operation when the protection target is normal, and perform a closing operation by a trip command output when the protection target is abnormal.

  The contact 22 is energized and deenergized by a coil (not shown) whose drive current is controlled to be turned on and off according to the time of soundness and failure diagnosed by the self-diagnosis function of the protective relay device 2. The contact 22 performs an open circuit operation when the protective relay device 2 is healthy, and performs a close circuit operation when a failure occurs.

  The coil 25 forms a drive current supply path when the contact 12 performs a closing operation. Thereby, the contacts 7a and 7b shift from the open / closed state when the protective relay device 1 is healthy to the open / closed state at the time of failure. When the contact 22 performs a closing operation, the coil 26 forms a drive current supply path. Thereby, the contacts 8a and 8b shift from the open / closed state when the protective relay device 2 is healthy to the open / close state at the time of failure.

  The contacts 7a, 8a, 11a and 21a are connected in series, the contacts 8b and 11b are connected in series, the contacts 7b and 21b are connected in series, and the current flowing through these three series circuits is not shown in the circuit breaker. It becomes a trip signal to. The open / closed state of the contacts 12 and 22 is transmitted as a binary level signal to an external device such as a monitoring panel (not shown). In the external device, when the input binary level signal is one level, the corresponding protective relay device is recognized as being healthy, and when it is the other level, the corresponding protective relay device is Recognizes that it is bad.

  Reference numerals 13 and 23 shown across the both ends of the contacts 12 and 22 are mechanical parts provided on the arrangement unit side on which the protective relay devices 1 and 2 are mounted. In the state where the protective relay devices 1 and 2 are mounted, the mechanical parts 13 and 23 maintain the current path passing through the contacts 12 and 22 in a state where the contact points 12 and 22 can be opened and closed. In a state where 2 is not mounted, the current path is formed in a closed state in place of the non-existing contacts 12 and 22.

  Next, the operation of the protective relay system according to the first embodiment configured as described above will be described. FIG. 2 is a circuit diagram showing a configuration of an output unit when the first device and the second device arranged in different units in the protection relay system shown in FIG. 1 protect the same protection object separately and independently. .

  In FIG. 2, when the two protection relay devices 1 and 2 are both in a healthy state, the contacts 7a and 8a are both in a closed circuit operating state, and the contacts 7b and 8b are both in an open circuit operating state. Further, since the protective relay devices 1 and 2 are mounted on the mechanical components 13 and 23, the current path passing through the contacts 12 and 22 is maintained in a state where the contacts 12 and 22 can be opened and closed.

  In this state, the protection relay devices 1 and 2 perform the normality determination of the protection target separately. As a result, when the protection relay device 1 determines that the protection target is abnormal and outputs a trip command, both or one of the contacts 11a and 11b performs a closing operation. When the protection relay device 2 determines that the protection target is abnormal and outputs a trip command, both or one of the contacts 21a and 21b performs a closing operation.

  In this case, even if the contact 11b is closed, no current flows through the series circuit of the contact 11b and the contact 8b because the contact 8b is in the open operation state. Similarly, since the contact 7b is in the open operation state even when the contact 21b is closed, no current flows through the series circuit of the contact 21b and the contact 7b.

  On the other hand, in the series circuit of the contacts 7a, 8a, 11a, and 21a, when the contact 11a performs a closing operation and the contact 21a performs a closing operation, a current flows through the series circuit, and a trip signal is output to a circuit breaker (not shown). Is output. Thus, when the trip command outputs by the two protective relay devices match, the circuit breaker can be tripped.

  In the two protection relay devices, the soundness diagnosis of the own device is performed by the self-diagnosis function in the process of performing the normality judgment operation of the same protection target separately. For example, when a device failure is detected in the protective relay device 1, the protective relay device 1 stops the normality determination operation of the protection target. As a result, the contact 12 performs a closing operation, and a drive current flows through the coil 25. Therefore, the contact 7a performs an opening operation, and the contact 7b performs a closing operation. Then, when the contact 12 is in the closed circuit operation state, the external device recognizes the device failure of the protective relay device 1.

  In this case, since the protection relay device 2 on the healthy side performs the normality determination operation of the protection target regardless of the failure of the protection relay device 1, the protection command abnormality is determined and the trip command is output. Then, both or one of the contacts 21a and 21b performs a closing operation, but since the contacts 8a and 7b are in a closing operation state, the AND condition that both the contacts 21a and 21b perform the closing operation is satisfied. The circuit breaker can be tripped. That is, the protection of the protection target can be continued independently.

  Since the failure of the protective relay device 1 has been recognized by the external device, the clerk turns off the power of the failed protective relay device 1 at an appropriate time in order to replace the protective relay device 1 on the abnormal side. The apparatus 1 is taken out from the protective panel 4 and is left for restoration work.

  Here, in the conventional configuration in which the mechanical parts 13 and 23 are not provided, when the faulty device 1 is taken out from the protective panel 4, a current path passing through the contact 12 formed when the faulty device 1 exists is opened. Since the drive current does not flow to the coil 25 and the contacts 7a and 7b return to the original operating state at the normal state, both the contacts 21a and 21b are closed in the healthy protective relay device 2. The AND condition for performing the operation cannot be established, and it is impossible to continue protection of the protection object alone.

  On the other hand, in the first embodiment, when the failed protective relay device 1 is taken out from the protective panel 4, the mechanical component 13 passes through the contact 12 formed when the failed device 1 exists. Since the current path is maintained in the closed state, a state in which the drive current flows through the coil 25 is formed. As a result, the contacts 7a and 7b do not return to their original operating state, but the contact 7a maintains the open circuit state and the contact 7b maintains the closed circuit state. Therefore, the protection relay device 2 on the healthy side can continue to protect the protection target alone after the failed protection relay device 1 is taken out of the protection panel 4.

  As described above, according to the first embodiment, the protective relay that can continue to serve as the protective relay device even during the work of repairing and replacing the abnormal part of the failed device. You can get a system.

Embodiment 2. FIG.
FIG. 3 is a block diagram showing a configuration of a protective relay system according to Embodiment 2 of the present invention. As shown in FIG. 3, the protection relay system according to the second embodiment includes a protection relay device 5 and an auxiliary relay 3 in each arrangement unit provided in a lattice shape on a protection panel 4 that is a housing. , Each is implemented interchangeably.

  The protective relay device 5 has a configuration in which the protective relay device (first device) 1 and the protective relay device (second device) 2 shown in FIG. 1 are integrated, and the protection according to the second embodiment. The relay device 5 has a configuration in which the first device side and the second device side can be individually mounted in the same arrangement unit and can be individually taken out from the arrangement unit. The first device and the second device have a function of communicating with each other.

  FIG. 4 is a circuit diagram showing a configuration of an output unit when the first device and the second device arranged in the same unit in the protection relay system shown in FIG. 3 separately protect the same protection object. As shown in FIG. 4, the configuration of the output unit is the same as in FIG.

  That is, the output circuit 30 of the protective relay device 5 includes an output circuit 30a on the first device side and an output circuit 30b on the second device side. Although the reference numerals are different from those in FIG. 2, the output circuit 30 a includes contacts 111 a and 111 b corresponding to the contacts 11 a and 11 b and a contact 112 corresponding to the contact 12 in the output circuit 10. Further, the output circuit 30 b includes contacts 121 a and 121 b corresponding to the contacts 21 a and 21 b and a contact 122 corresponding to the contact 22 in the output circuit 20.

  And the code | symbol 113,123 shown in the shape which straddles the both ends of the contacts 112,122 was provided in the location where the 1st apparatus and the 2nd apparatus are each arrange | positioned in the arrangement | positioning unit in which the one protective relay apparatus 5 is mounted. It is a mechanical part. When the protective relay device (first device) (second device) 5 is mounted, the mechanical components 113 and 123 maintain the current path passing through the contacts 112 and 122 in a state where the contacts 112 and 122 can be opened and closed. In the state where the protective relay device (first device) (second device) 5 is not mounted, the current path is formed in a closed state in place of the non-existing contacts 112 and 122.

  In the protective relay system according to the second embodiment configured as described above, the first device and the second device in one protective relay device are separately protected independently as in the first embodiment. By judging the normality of the device and conducting self-diagnosis, when both devices are healthy, the circuit breaker can be tripped when the AND condition of the trip command output by both devices is satisfied, and one device fails. Then, the other healthy device can shift to the protection operation alone. And when taking out a failure side apparatus from a protection board, the other healthy apparatus can be made into the state which can continue protection operation independently by the mechanism components provided in the arrangement | positioning unit.

  Therefore, in the second embodiment, as in the first embodiment, the role of the protective relay device is continued even during the work of repairing and replacing the abnormal part of the failed device. Can be obtained.

  As described above, the protective relay system according to the present invention continues to serve as a protective relay device while performing work for repairing and replacing an abnormal part of a failed device. Useful as.

It is a block diagram which shows the structure of the protection relay system by Embodiment 1 of this invention. It is a circuit diagram which shows the structure of an output part in case the 1st apparatus and 2nd apparatus which are arrange | positioned at a mutually different unit in the protection relay system shown in FIG. 1 protect the same protection object separately. It is a block diagram which shows the structure of the protection relay system by Embodiment 2 of this invention. It is a circuit diagram which shows the structure of the output part in case the 1st apparatus and 2nd apparatus which are arrange | positioned in the same unit in the protection relay system shown in FIG. 3 protect the same protection object separately.

Explanation of symbols

1 Protection relay device (first device)
2 Protection relay device (second device)
3 Auxiliary relay 4 Protection panel 5 Protection relay device (integrated type of 1st device and 2nd device)
7a, 7b Contacts that perform opposite switching operations when the protective relay device (first device) is healthy and when it fails 8a, 8b Opposite when the protective relay device (second device) is healthy and when it fails 10 Contact circuit for protective switching device (first device) Output circuit 11a, 11b, 21a, 21b Contact for trip command output 12, 22 Contact for device fault output 13, 23 Mechanical component 20 Protection relay Output circuit of the device (second device) 25 Coil for energizing / deactivating the contacts 7a, 7b 26 Coil for energizing / deactivating the contacts 8a, 8b 30 Integrated protection relay of the first device and the second device Output circuit of device 30a Output circuit of first device of integrated protective relay device 30b Output circuit of second device of integrated protective relay device 111a, 111b, 121a, 121b Contact point for trip command output 112, 122置不 good contacts 113 and 123 mechanical components for output

Claims (3)

Each of the output circuits is disposed in the housing so as to be individually replaceable, and each output circuit has a first contact and a second contact used for outputting a trip command when the device is healthy, and a third used for outputting a device failure when the device is faulty. Of the two or more protective relay devices including the contact points of the two, when the two protective relay devices protect the same protection object separately and in parallel, each of the first devices is in good health. A trip signal is output to the outside when an AND condition is established by the contact, and when one device fails, the third contact of the failure device outputs a device failure signal to the outside and the other device is sound In the protective relay system, a current path is formed so that a trip signal can be output to the outside when an AND condition is established by the first and second contacts.
In the state where the protective relay device is mounted at the location of the protective relay device in the housing, the current path is maintained in a state where the third contact can be opened and closed, and the protective relay device is mounted. In a state where the third contact is present, a mechanical component that maintains the current path that has been formed when the third contact is present is attached.
A protective relay system characterized by that.   2. The protective relay system according to claim 1, wherein in the housing case, the two protective relay devices are housed in different units.   2. The protective relay system according to claim 1, wherein in the housing case, the two protective relay devices are housed in the same unit and have a function of communicating with each other.

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