JPS6412166B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides remote monitoring for determining and controlling the status of circuit breakers and operation information of reclosing devices in power system transmission lines. Regarding a control device.

(Prior art) In general power systems, information such as reclosing execution and final shutoff of low-speed reclosing devices for power transmission lines is not transmitted to the control center for each transmission line, but is sent to multiple transmission lines. information is logically integrated and transmitted to the control center. This saves the amount of information transmitted and
This is because it is difficult to secure individual display space on the control panel. Then, the monitor judges the success, failure, or non-implementation of reclosing the faulty transmission line based on the information on the re-closing implementation and final shutoff of the transmission line circuit breaker (hereinafter referred to as CB) and the re-closing device. .

(Problem to be solved by the invention) However, when multiple accidents occur at the same time, if the information on reclosing execution and final shutoff is logically integrated, there is a risk of erroneous judgment regarding reclosing failure or non-execution. There is a need for some kind of countermeasures.

Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned prior art, and to combine information on CB on/off, re-closing execution of the re-closing device, and final shut-off in a remote monitoring control device to achieve successful re-closing, By determining failure or non-implementation and notifying the supervisor of the determination result, remote monitoring is effective in preventing the supervisor from misperceiving the success, failure, or non-implementation of reclosing, and reducing the burden on the supervisor. The purpose is to provide a control device.

[Structure of the invention]

(Means for Solving the Problems) To achieve this objective, the present invention provides
A first determining means for determining the on/off state of the CB, a second determining means for determining the operating state of the reclosing device, and determining the number of trips of the CB, time, etc. based on information from the first determining means. a third determining means that turns on and off a determination signal based on the information on re-closing execution and final shutoff of the re-closing circuit and the on/off state of the CB on the condition that a certain period of time has elapsed since the trip of the CB; Information from the third determination means and CB
The fact that a certain period of time different from the above-mentioned period has passed since the trip of CB, the number of trips of CB, and
and a fourth determination means for determining success, failure, non-implementation of reclosing, and natural input of CB using information as to whether another fixed period of time has elapsed from the input of the CB to the trip. It is characterized by the fact that

(Embodiment and operation) FIG. 1 is a system diagram of a remote monitoring and control device according to an embodiment of the present invention, in which a indicates a reclosure determination device d ₁ and a reclosure determination memory d ₂ C ₁ to _{C i} are CBs (circuit breakers), S11 to S1i are on/off information for circuit breakers C ₁ to _{C i} , and R1 is a reclosing device for the circuit breakers C ₁ to _{C i} . Implementation information, R2 is also the re-closing final cutoff information, b ₁ is the input/output device on the control center side, b ₂
is the local input/output device. Note that the re-closing implementation information R1 and the re-closing final cutoff information R2 are information that is handled as the logical sum of each corresponding information of the plurality of circuit breakers C ₁ to _{C i} .

The operation of the apparatus shown in FIG. 1 will be explained with reference to the flowcharts shown in FIGS. 2 and 3.

When a state change from "off" to "on" (hereinafter referred to as "state change") occurs in the circuit breakers C ₁ to C _i , the reclosing determination device d ₁ of the control panel a outputs the on/off information S11 to S
1i, and the time of occurrence is stored in the reclosure determination memory _d2 . This operation is as shown in the flowchart of FIG.

Next, when any CB makes an accident trip for the first time, the reclosure determination device _d1 stores the memory for reclosure determination.
Read the contents of d ₂ and check the past certain time of the CB where the accident occurred,
For example, it is determined whether there is a change to the "ON" state within the TC time (FIG. 2: Step 20). If "YES" here, if the CB is reclosing (step 31: "YES"), proceed to step 25; otherwise (step 31: "NO"), the CB is automatically inserted (step 32).

If it is determined that the state has changed to the "ON" state within the TC time, the reclosing device is not ready, and
No reclosing is performed. Therefore, this device determines that reclosing is not performed (steps 21, 22, 2).
3). An example of the time chart is shown in FIG. Here, the time TC is determined by the device as the time required to prepare the reclosing device, but is usually about 2 minutes.

On the other hand, if it is determined that there has been no change to the "on" state within the past TC time (step 22: "NO"), a signal ( (hereinafter referred to as RECNG) is “0”
Assuming that the number of trips of this CB is "1",
Memory d ₂ for reclosing judgment along with the trip time
(Step 24).

Thereafter, the reclosure determining device _d1 delays this process from the first trip until the TA time has elapsed (step 25). Then, CB until TB time elapses.
is “off” and the reclosing execution information R1 and the reclosing final cutoff information R2 are simultaneously transmitted as “1” (step 26: “YES”), the reclosing judgment signal
RECNG is set to "1" and stored in the reclosure determination memory _d2 corresponding to the CB (step 27). On the other hand, each of the above information R1, R2
and the condition of CB “off” is not satisfied (step 26:
If "NO"), the reclosure determination signal RECNG remains "0", bypassing step 27 and proceeding to the next step 28. If the CB makes a trip other than the first time (Step 21: “NO”),
The reclosure determination device _d1 adds "1" to the number of CB trips in the reclosure determination memory _d2 corresponding to the CB (step 29), and proceeds to step 26.

On the other hand, after the TB time has elapsed, or even if the TB time has not elapsed, the second CB state change after the TA time has elapsed, that is, the CB off state where the number of CB trips is stored as "1". When a signal indicating a change in condition arrives (step 28: "YES"), success, failure, or non-implementation of reclosing is determined based on the CB on/off signals S11 to S1i and the RECNG signal (step 30). This determination is made based on the following three conditions.

(1) If the CB is “on” in the final state, the reclosing is successful. An example of the time chart is shown in FIG.

(2) If the CB is “off” and RECNG is “1” in the final state, reclosing fails. Examples of the time charts are shown in FIGS. 6 and 7. FIG. 6 shows a case that is determined after the TB time has elapsed, and FIG. 7 shows a case that is determined based on the second CB change to "off."

(3) If the CB is “off” and RECNG is “0” in the final state, reclosing will not be performed. An example of the time chart is shown in FIG.

An example of the operation of the device of the present invention when a plurality of CBs are tripped in succession will be explained using the accident example shown in FIG.

In the figure, S11, S12, and S13 are CBC ₁ , C ₂ ,
This is the on/off information for _C3 . Further, R1 and R2 are re-closing execution information and re-closing final cutoff information of these CBs. These information S11, S12, S13, R
1 and R2 are information input from the power system to the device of the present invention at the time of an accident. Information S11, S12,
As already mentioned, each signal RECNG of S13 is
Reclosing judgment memory d ₂ corresponding to CBC ₁ , C ₂ , C ₃
This is a signal for re-closing judgment stored in . The present invention also includes a memory that stores the number of trips of the CB, but this is omitted in FIG. 9 because it is unnecessary for the explanation of this embodiment.

Hereinafter, the accident situation and the operation of the device of the present invention will be explained with reference to FIG.

At time _t0 , a change in the state of information S11 to "off" is input to the device of the present invention. This condition is caused by this
Since the time TC or more has passed since the CB turned on, there is a possibility that the reclosing device will operate. In the device of the present invention, RECNG of the on/off information S11 is set to "0" (Fig. 2: Steps 20, 21, 22, 2).
4).

Next, at time t ₁ , the on/off information S12 is turned off.
A change in state to is input to the apparatus of the present invention. RECNG of the admission/cutoff information S12 as in the case of the admission/cutoff information S11
is set to “0” (Figure 2: Steps 20, 21,
22, 24). Next, at time t ₂ , the on/off information S1
The state change of No. 3 to "off" is input to the device of the present invention. Similarly to the case of the admission/cutoff information S11, the admission/cutoff information S1
3 is set to "0" (Figure 2: steps 20, 21, 22, 24). This state is CBC ₁ ,
Three CBs, C ₂ and C ₃ , have tripped for the first time and are all waiting for re-closing. These reclosings occur after a time T3 has elapsed since the first trip of each CB.
And there is a possibility that it will be carried out during a time period during which time TA has not yet elapsed.

At time t ₃ CBC ₁ is reclosed. When the reclosing is successful, the signal S11 changes from "off" to "on" as shown in FIG. 9, and the reclosing execution information R1
changes from “0” to “1” and returns to “0” again after the re-closing is performed.

At time t ₄ CBC ₂ is reclosed. If the re-closing fails, as shown in FIG. 9, the re-closing execution information R1 changes from "0" to "1" and returns to "0" again after the re-closing is performed. The same applies to the reclosure final cutoff information R2. Also, the on/off information S21 is “off”→
It changes from "on" to "off" or remains "off". In other words, the CBC on/off information S21 indicates the re-closing →
Depending on the performance of the on-site input/output device b ₂ (Fig. 1), the state may change from "off" to "on" to "off" due to a failure, or if the "on" time is short, it may change. cannot be detected, and the on/off information S21 is "off" →
In many cases, the state does not change from "on" to "off" and remains "off". FIG. 9 shows the case where the switch remains "off".

At time _t4 , the on/off information S21 is "off", and the re-closing information R1 and the final re-closing information R2 are both "1", so the on/off information S12 is
RECNG becomes “1” (Figure 2: Step 2
7). However, since the on/off information S11 is "on" and the on/off information S13 is because time TA has not elapsed since the first trip, each RECNG is "0".
It remains as it is.

At time _t5 , TB seconds have passed since the first trip, and since the on/off information S11 is "on", CBC ₁ is determined to have succeeded in reclosing.

At time _t6 , TB seconds have elapsed since the first trip in the on/off information S12, the on/off information S12 is "off", and the RECNG of the on/off information S12 is "1", so
CBC ₂ is determined to be a failed reclosure.

At time t ₇ , the on/off information S13 changes from the first trip.
TB seconds have passed, the on/off information S13 is "off" and the RECNG of the on/off information S13 is "0", so CBC ₃
It is determined that reclosing is not performed.

In the conventional device, the on/off information S11, S1
2, S13, since the states of the re-closing implementation information R1 and the re-closing final cut-off information R2 were only provided to the supervisor as they were, the supervisor could not understand the on/off information S1.
2 and the on/off information S13, it was difficult to distinguish whether re-closing was performed or not, and erroneous judgments were sometimes made. On the other hand, in the present invention, as described above, it is possible to notify the monitoring staff of whether reclosing has been carried out, not carried out, or failure for each CB.

In addition, in Fig. 9, the time before time t ₀ is simply
This simply indicates the condition that TC time has elapsed since CB "entered". This is a condition for the determination result in step 21 of FIG. 2 to be "NO".

In addition, after the above-mentioned judgment is completed, the value stored in the memory _d2 for reclosing judgment of the number of trips of the CB is set to “0”.
shall be. The previously set TA time and TB time are the times in which the low-speed reclosing device may perform the action of re-closing the circuit breaker, plus the delay in the transmission system, and the time TA is usually 55 seconds, hours
A preferable setting value for TB is about 3 minutes.
On the other hand, if a CB for which the number of trips is not stored in the reclosing judgment memory _d2 changes its state in the "in" direction, it is determined that this is a spontaneous CB insertion accident.

Note that the above operation can also be realized by configuring the control panel a in terms of hardware, but each
Because it is necessary to remember the time etc. for each CB,
The space and cost for such equipment tends to be large. On the other hand, if a computer is used, the above operations can be performed with an inexpensive and small device.

In the above embodiment, the case of a low-speed reclosing device was explained as an example, but like a medium-speed reclosing device, a reclosing circuit that recloses the circuit within a time range that allows the control center to accurately grasp the on/off state of the CB. In the case of devices, this problem can also be handled by appropriately selecting each setting time.
Further, the present invention is applicable not only to reclosing devices but also to reclosing devices, re-reclosing devices, etc., with the only difference being the determination of how many trips are considered to be reclosing failures.

〔Effect of the invention〕

As described above, according to the present invention, by combining information on CB on/off and re-closing device to determine power transmission line accidents, it is possible to obtain determination results with fewer false determinations. It is possible to provide a remote monitoring and control device that can also control other circuit devices based on this determination result.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a remote monitoring and control device according to an embodiment of the present invention, FIGS. 2 and 3 are flowcharts for explaining the operation of the device shown in FIG.
The figures are time charts showing various operational examples of the apparatus of FIG. 1. a...Control panel, _d1 ...Reclosing judgment device, _d2 ...
Memory for re-closing judgment, C ₁ to C _i ... Circuit breaker, S11
~S1i... Breaker on/off information, R1... Re-closing implementation information, R2... Re-closing final shut-off information.

Claims (1)

[Claims] 1. A first determination means for determining the on/off state of the circuit breaker of the power transmission line, a second determination means for determining the operating state of the reclosing device, and a circuit breaker for the power transmission line based on information from the first determination means. A third judgment is made in which the number of trips, time, etc. of the circuit breaker is stored, and a determination signal is turned on and off based on information on re-closing, final re-closing, and on/off state of the circuit breaker on the condition that a certain period of time has elapsed since the circuit breaker was tripped. and information from the first, second, and third determining means, and that a certain period of time different from the certain period of time has elapsed since the circuit breaker tripped;
Using information on the number of times the circuit breaker trips and whether a different fixed period of time has elapsed between the circuit breaker closing and tripping, it is possible to determine the success, failure, failure, and spontaneous closing of the circuit breaker. A remote monitoring control device comprising a fourth determining means for determining.