JP2011229310A - Automatic recovery apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic recovery apparatus capable of suppressing, to a minimum, charging to a faulty bus bar.SOLUTION: An automatic recovery apparatus 1 or 2 performs automatic recovery by turning on a breaker 211 or 221 at a transmission end when predetermined power-on conditions are satisfied after a black out, where there is no bus bar voltage nor power transmission line voltage and a breaker 212 or 222 on a power transmission line 201 or 202 is activated, is detected. The automatic recovery apparatus 1 or 2 includes a determination circuit 12, which determines that a fault has occurred in a bus bar 200 should there continue to be a power transmission line voltage over a predetermined period T2 or T3 after the breaker 211 or 221 is activated.

Description

  The present invention relates to an automatic restoration device (ARE) that restores a power system when an accident occurs in the power system.

  In the receiving power station where power is sent from the power station bus to the next power station bus, if there is a ground fault or a short-circuit accident such as a lightning strike in the power system, connect the power system as soon as possible. In order to recover, an automatic recovery device is provided (for example, refer to Patent Document 1). For example, as shown in FIG. 5, two-line power transmission is provided with automatic restoration devices 101 and 102 at the power transmission end and the power reception end, respectively, and a power reception protection relay or a bus protection relay that protects the bus 200 at the power reception end. If an accident occurs in the power receiving end bus 200 in the case where the power is not received, the following recovery process is performed.

"Step S101"
The power transmission line protection relay at the power transmission end operates, and the circuit breakers 211 and 221 on the power transmission end side of the power transmission lines 201 and 202 are cut off.

"Step S102"
Since the system voltage is lost in step S101, “no bus voltage” and “no line voltage” are detected at the power receiving end, and the power receiving lines 201 and 202 receive power by the all-stop cutoff function of the second automatic recovery device 102. The end side circuit breakers 212 and 222 are blocked.

“Step S103”
After waiting (timer counting) until the closing condition is satisfied, when the closing condition is satisfied, the first automatic recovery device 101 turns on the circuit breakers 211 and 221 on the power transmission end side. At this time, for example, the first power transmission end side circuit breaker 211 is inserted first in order from a predetermined priority line.

“Step S104”
When the first power transmission end side circuit breaker 211 is turned on, electricity is supplied to the first power receiving end side circuit breaker 212, and “no bus voltage” and “with line voltage” are detected at the power receiving end. The Accordingly, the closing condition is satisfied, and the first power receiving end side circuit breaker 212 is turned on by the second automatic recovery device 102.

“Step S105”
Since the first power receiving end side circuit breaker 212 is turned on, it is charged up to the power receiving end bus 200 where the power receiving end electrical station bus accident has continued, so it is determined that there is an accident again at the power transmitting end, The power transmission line protection relay operates and the first power transmission end side circuit breaker 211 is disconnected again.

"Step S106"
By the interruption of the first power transmission end side circuit breaker 211, the power receiving end becomes “no bus voltage” and “no line voltage”, and again by the all-stop interruption function of the second automatic recovery device 102 as in step S102. The first power receiving end side circuit breaker 212 is interrupted. That is, after the first power receiving end side circuit breaker 212 is turned on, re-breaking (final interruption) is performed, and automatic loading by the automatic recovery devices 101 and 102 is no longer performed. Here, in this state, the first power transmission end side circuit breaker 211 is cut off (turned off), the second power transmission end side circuit breaker 221 is turned on (on), and the power receiving end side circuit breakers 212 and 222 are cut off ( Off).

  Through such processes and operations, the driver determines that an accident has occurred in the power receiving end bus 200, and performs recovery work such as carving of the accident bus. That is, after the breaker (not shown) of the bus 200 is shut off from a distance, the bus 200 is subjected to a trial charge to discriminate and separate the bus where the accident has occurred and the bus that has not occurred.

JP 2002-271984 A

  Thus, in the conventional automatic recovery device, when the bus accident continues, at least one trial charge is performed on the accident bus. Furthermore, in order to isolate the accident bus, it is necessary to perform a trial charge of the bus 200, and the accident bus will be charged for the second time, which may lead to an expansion of the accident range and equipment damage. Especially for equipment that is difficult to recover once an accident occurs, such as GIS (gas switchgear), there is a risk of equipment damage due to a single charge, and if the equipment is damaged, it will be restored to its original state. During this period, a long supply failure occurs.

  In addition, when performing the second test charge to isolate the accident bus, the charge will be after the final interruption, so it may be necessary to perform a test charge after confirming the site in order to confirm and ensure safety. is there. In such a case, trial charging and further restoration cannot be performed until a person goes to the site and confirms, and there is a possibility that it takes time for the restoration.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic recovery device capable of minimizing charging of an accident bus.

  In order to solve the above-mentioned problem, the invention according to claim 1 satisfies a predetermined input condition after detecting a total stop that there is no bus voltage and no transmission line voltage and shutting off the breaker of the transmission line. In the automatic recovery device that performs automatic recovery by turning on the circuit breaker, when the state of transmission line voltage continues for a predetermined time after the closing condition is satisfied and the circuit breaker is turned on, A determination circuit for determining an accident is provided.

  According to the present invention, when the breaker of the transmission line is turned on after all the stops are cut off and the state where the transmission line voltage is present continues for a predetermined time, the determination circuit determines that the bus is faulty. That is, in the case of a power transmission line accident, the state where the power transmission line voltage is present does not continue for a predetermined time.

  According to a second aspect of the present invention, in the automatic recovery device according to the first aspect, when the determination circuit determines that a busbar accident has occurred, the switch installed on the busbar is separated.

  According to the first aspect of the present invention, since it is determined whether or not there is a bus accident by the determination circuit without charging the bus, charging of the accident bus can be minimized. As a result, it is possible to suppress the expansion of the accident range and equipment damage, and when performing a trial charge to isolate the accident bus, it will not be charged after the final interruption, so it can be quickly recovered without performing on-site confirmation. Work can be performed.

  According to the second aspect of the present invention, when it is determined that a bus accident has occurred, it is possible to determine whether or not an accident bus disconnection operation is necessary in order to isolate the switch installed on the bus. By configuring with a logic circuit, automatic operation becomes possible, and more rapid recovery work can be performed.

It is a systematic diagram which shows the arrangement | positioning state of the automatic recovery apparatus which concerns on embodiment of this invention. FIG. 2 is a logic circuit diagram showing an automatic recovery circuit and a determination circuit of the automatic recovery device of FIG. 1. FIG. 3 is a continuation of the logic circuit diagram of FIG. 2, and is a logic circuit diagram for breaking a busbar circuit breaker. It is a figure which shows the bus-bar interruption circuit of the automatic recovery apparatus of FIG. It is a systematic diagram which shows the arrangement | positioning state of the conventional automatic recovery apparatus.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a system diagram showing an arrangement state of the automatic restoration apparatuses 1 and 2 according to the embodiment of the present invention. Two lines are transmitted between a power transmission end (A end) and a power reception end (B end). Electric wires 201 and 202 are provided, and power transmission lines 201 and 202 are connected to the bus 200 at the power receiving end. In addition, a first power transmission end side circuit breaker 211 is disposed at the power transmission end of the first power transmission line 201, a first power reception end side circuit breaker 212 is disposed at the power reception end, and the power transmission end of the second power transmission line 202 is disposed. Is provided with a second power transmission end side circuit breaker 221, a power receiving end is provided with a second power receiving end side circuit breaker 222, and a bus bar breaker 231 is provided with the bus 200.

  In such a power system, a first automatic recovery device 1 is provided on the power transmission end side, and a second automatic recovery device 2 is provided on the power reception end side, and the first automatic recovery device 1 includes the circuit breaker 211 on the power transmission end side. 221 can be controlled to open / close, and the second automatic restoration device 2 can control the open / close of the circuit breakers 212 and 222 and the busbar circuit breaker 231 on the power receiving end side. Further, it is assumed that a power receiving protective relay, a bus protective relay and the like for protecting the power receiving end bus 200 are not provided.

  The automatic recovery devices 1 and 2 have the same function and configuration as those of the automatic recovery devices that have been widely used, except for the determination circuit described later, and the automatic recovery devices 1 and 2 have the same configuration. Therefore, the configuration of the second automatic recovery device 2 that is mainly installed at the power receiving end electric station will be described below.

  The second automatic recovery device 2 includes an automatic recovery circuit 11 that automatically recovers power transmission after all stoppages are interrupted, and a determination circuit 12 that determines whether or not there is a bus accident. The automatic recovery circuit 11 selects “use all stops” to use the all stop interruption, and the first predetermined time T1 elapses after the all stops are detected (determined to be all stopped). Further, on the condition that the circuit breaker of the own line is turned on, a circuit breaker break command is output (52T relay is turned on). Here, the circuit breaker switching conditions vary depending on the system, etc., for example, the power transmission end has its own bus voltage and no line voltage, and the power receiving terminal has its own bus. The input condition is that there is no voltage and there is a line voltage.

  In the determination circuit 12, the automatic restoration circuit 11 outputs a circuit breaker break command (52T relay is turned on), the second predetermined time T2 has elapsed, and the state where the transmission line voltage is present is the third predetermined time T3. When it continues, it determines with a bus-bar accident (52TB1 relay is turned on). That is, in the case of a power transmission line accident, even if the circuit breaker is turned on, the state where the voltage of the power transmission line does not continue does not continue. Further, the predetermined times T2 and T3 are set as follows, for example.

Second predetermined time T2 = power transmission end ARE start time−all stop detection time
+ Power transmission end relay trip time + margin time Third predetermined time T3 = power transmission end relay trip time + margin time Here, “power transmission end ARE activation time” means automatic recovery of the first automatic recovery device 1 at the power transmission end. Time until the function (ARE function) is activated, “all-stop detection time” is the time until “no bus voltage” and “no line voltage” are detected, and “transmission end relay trip time” In the case of a line fault, the time it takes for the power line protection relay to operate at the power transmission end and the circuit breaker to be shut off again. The “time margin” is the safety to compensate for variations in the mechanical operating time. This is a time that takes into account the reliability and certainty That is, the predetermined times T2 and T3 are set so that it is possible to reliably determine that a bus line accident occurs when a time that can be determined as a transmission line accident is exceeded in the case of a transmission line accident (track accident).

  In this way, when the determination circuit 12 determines that a bus accident has occurred, the automatic recovery device on the power receiving end side interrupts the circuit breaker of the bus and does not activate the automatic recovery function for other power transmission lines. ing. Further, an alarm indicator (not shown) for notifying and warning that a bus accident has occurred is turned on. Here, as shown in FIG. 3, for each transmission line / line, whether to use the trip of the bus breaker (use of BTS trip) is selected, and whether or not a bus accident has occurred (52TBn relay is turned on). If any of the transmission lines satisfies this condition, the circuit breaker of the busbar is cut off (52 TB relay is turned on).

  In addition, a bus interrupting circuit as shown in FIG. 4 is provided. That is, “43Auto Relay” for selecting whether or not to interrupt the bus breaker when it is determined as a bus accident as described above, and “43TL Relay” for selecting whether or not to use the automatic recovery function normally. Are connected in series. Furthermore, “52TB contact points” that are turned on by the operation of the 52TB relay are connected in series. Then, the disconnection of the bus breaker is selected (43Auto relay is on), the normal use of the automatic recovery function is selected (43TL relay is on), and the 52TB relay operates as described above (52TB contact) On), the circuit breaker of the busbar is cut off.

  Next, the operation of the automatic recovery apparatuses 1 and 2 having such a configuration will be described. Here, “use all stops” is selected in the automatic recovery circuit 11, “use BTS trip” is selected in the logic circuit of FIG. 3, and “43Auto relay” is turned on, and “43TL relay” is turned on. Suppose that

First, in the power system of FIG. 1, when an accident occurs on the receiving end bus 200,
"Step S1"
The power transmission line protection relay at the power transmission end operates, and the circuit breakers 211 and 221 on the power transmission end side of the power transmission lines 201 and 202 are cut off.

"Step S2"
Since the system voltage is lost in step S1, “no bus voltage” and “no line voltage” are detected at the power receiving end, and the power receiving lines 201 and 202 receive power by the all-stop cutoff function of the second automatic recovery device 2. The end side circuit breakers 212 and 222 are blocked. At this time, since all stoppages have been interrupted, the timer for counting the first predetermined time T1 is started in the automatic recovery circuit 11 of the first automatic recovery device 1.

"Step S3"
When the first predetermined time T1 has elapsed, the first automatic restoration device 1 turns on the circuit breakers 211 and 221 on the power transmission end side. At this time, for example, the first power transmission end side circuit breaker 211 is inserted first in order from a predetermined priority line.

"Step S4"
When the first power transmission end side circuit breaker 211 is turned on, electricity is supplied to the first power receiving end side circuit breaker 212, and “no bus voltage” and “with line voltage” are detected at the power receiving end. The At this time, a timer for counting the predetermined times T2 and T3 is started in the determination circuit 12 of the second automatic recovery device 2.

"Step S5"
When the predetermined times T2 and T3 have elapsed, the determination circuit 12 of the second line voltage device 2 determines that a bus fault has occurred, and as described above, the circuit breaker 231 of the bus 200 is interrupted (the switch is separated). Furthermore, the automatic recovery function for the other power transmission line 202 is activated and stopped, and the alarm indicator is turned on. In this state, the circuit breakers 211 and 221 on the power transmission end side are turned on (on), and the circuit breakers 212 and 222 on the power receiving end side and the circuit breaker 231 on the bus 200 are cut off (off).

  By such processing and operation, the driver knows that an accident has occurred in the power receiving end bus 200, and by performing a trial charge on the bus 200, the bus that has occurred and the bus that has not occurred Can be discriminated and separated. For example, in the power system of FIG. 1, when charging (with voltage) is continued on the upper bus of the circuit breaker 231 of the bus 200 and charging is not continued on the lower bus, an accident occurs on the lower bus. Is determined to have occurred.

  On the other hand, when an accident occurs on the power transmission lines 201 and 202 at the same time, the circuit breakers 211 and 221 on the power transmission end side and the circuit breakers 212 and 222 on the power reception end side are all shut off (steps S1 and S2). Thereafter, when the first predetermined time T1 has elapsed, the circuit breakers 211 and 221 on the power transmission end side are turned on. At this time, even if the first power transmission end side circuit breaker 211 is turned on, the state of “no bus voltage” and “with line voltage” does not continue until the predetermined time T2 and T3. The 200 circuit breakers 231 are not interrupted. And when the line accident is continuing, like the normal automatic recovery function, the circuit breakers 211 and 221 on the power transmission end side are again cut off, resulting in “no line voltage”. After that, power is transmitted again from the power transmission end, and the circuit breakers 212 and 222 on the power receiving end wait for the recovery condition to be satisfied because “line voltage exists”.

  As described above, according to the automatic recovery devices 1 and 2, the determination circuit 12 determines whether or not there is a bus accident without charging the bus 200 in which an accident has occurred. It can be minimized. That is, it is only necessary to perform a trial charge only when the accident bus 200 is isolated. As a result, it is possible to suppress the expansion of the accident range and equipment damage, and when performing a trial charge for isolating the accident bus 200, the charge after the final interruption is not achieved, that is, the first trial charge. Therefore, it is possible to perform a quick recovery operation by performing a trial charge without performing on-site confirmation. Moreover, when it is determined that a bus accident has occurred, the automatic circuit breaker 231 is shut off by the automatic recovery device 2 regardless of the driver, so that the accident bus 200 can be automatically separated and a quicker recovery operation can be performed. It becomes possible. In particular, when power is transmitted from the B end (power receiving end) to another electric station, the accident bus 200 can be quickly separated, so that the power system after the other electric station can be restored early. It becomes possible, and the big effect by this invention is acquired.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the automatic recovery devices 1 and 2 have the same configuration, but only the second automatic recovery device 2 disposed on the power receiving end side has a determination circuit 12, “43 Auto Relay”, etc. You may make it provide. Further, a switch that can be remotely controlled is provided, and it is possible to select whether to operate with a normal automatic recovery function that does not activate the determination circuit 12 or the like, or to activate and operate the determination circuit 12 as described above, by switching the switch. Thus, the operation of the electric power system may be changed according to the weather, the system status, the work system, and the like. Furthermore, it goes without saying that the automatic restoration devices 1 and 2 can be applied not only to two lines but also to the number of other lines.

DESCRIPTION OF SYMBOLS 1, 2 Automatic recovery apparatus 11 Automatic recovery circuit 12 Judgment circuit 201, 202 Power transmission line 200 Bus line 211, 212, 221, 222, 231 Circuit breaker

Claims (2)

In the automatic recovery device that detects the total stop that there is no bus voltage and transmission line voltage, and interrupts the transmission line breaker, then turns on the breaker and automatically restores when a predetermined closing condition is satisfied,
A determination circuit that determines a bus accident when a state in which a transmission line voltage is present continues for a predetermined time after the closing condition is satisfied and the breaker is turned on;
An automatic recovery device characterized by that. 2. The automatic recovery device according to claim 1, wherein when the determination circuit determines that a bus accident has occurred, a switch installed on the bus is separated.

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