JPS62141917A - Protective relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a protective relay device having the capability of high-speed single-phase reclosing and medium-speed three-phase reclosing, which is installed in a system having two circuit transmission lines. It is related to.

Technical Background of the Invention] Reclosing devices are used to protect power transmission lines, and these include single-phase reclosing devices and three-phase reclosing devices. Among these, high-speed single-phase reclosing, in which single-phase reclosing is performed at high speed in the case of a single-phase failure in each line, and in the case of a failure in two or more phases per line, the remaining phases are temporarily cut off, For example, at the advance closing terminal, the bus voltage “
"Yes", line voltage "No", adjacent line 3-phase power flow "Yes", and at the subsequent input terminal, bus voltage "Right J", synchronization "Yes", and adjacent line power flow 3-phase "Yes". There is medium-speed three-phase reclosing, which performs three-phase reclosing at high speed.

FIG. 4 is a failure mode diagram of a two-line system, which explains high-speed single-phase reclosing.

The 1 side indicates an R-phase failure, and the 2L side indicates an S-phase failure.

In this type of failure, both the 1st side and the 2L side are considered to be a 1-phase failure on a line-by-line basis, so high-speed single-phase reclosing is performed after a certain period of no-voltage time count for each line. do.

Next, a medium-speed three-phase reclosing circuit will be explained using a two-line system shown in FIG. In this case, only the 1L side showed no failure in the R phase and S phase. In this type of failure, the T phase, which is the remaining phase on the 1[ side, is temporarily cut off, and after counting the no-voltage time for a certain period
Depending on the set conditions, for example, if the conditions are bus voltage ``present'', line voltage ``absent'', and 3-phase power flow of the adjacent line ``present'' at the preceding terminal, when all of these conditions are met, medium speed 3 Perform phase reclosing. If the set conditions are not met for some reason, medium-speed three-phase reclosing is given up after a certain period of time has elapsed, and the circuit is finally shut off.

On the other hand, at the subsequent closing terminal, for example, the bus voltage is "present" and the synchronous "
If the conditions are ``right'' and 3-phase power flow on the adjacent line ``present,'' medium-speed 3-phase reclosing is performed when all of these conditions are satisfied. If for some reason the set conditions are not met,
After a certain period of time, medium-speed three-phase reclosing is given up and final shutoff occurs.

Next, the conventional re-closing system will be explained with reference to FIGS. 6, 7, and 8. Figures 6 and 7 show the failure conditions of the two-line power transmission line.
In other words, it is an easy-to-understand table of failure conditions such as those shown in FIGS. 4 and 5. Among the failure modes, R phase, S phase, and T phase, "・" mark indicates a faulty phase, rOJ mark indicates a healthy phase, HREC is a high speed single phase reclosing circuit, and HREC is a medium speed three phase reclosing circuit. No reclosing was shown.

Figure 8 is a block diagram of the high-speed single-phase reclosing circuit and medium-speed three-phase reclosing circuit, where the on-delay timer 791B1 is the high-speed single-phase reclosing no-voltage time h runt timer, and 79TB2 is the medium-speed three-phase reclosing no-voltage time. Callan 1 ~ Timer, 79 T 8
3 is a high-speed single-phase reclosing give-up time count timer, 791
B4 is a medium speed three-phase reclose hoof time count timer.

And the time limit of each timer is 79TB1 < 79TB
Set to 3.79TB2 <79T84. 8N[)
1 to 14 [14 is an AND gate, OR1 to OR3 are OR gates, NOT 1, NO12+Enot gate.

Here, look at the settings of the reclosing conditions in units of 1 Fit.
If it is a phase failure, a high-speed single-phase reclosing will be performed, and a medium-speed three-phase reclosing will be performed under the conditions that the bus voltage is "present", the line voltage is "absent", and the adjacent line 3-phase power flow is "@4".

As shown in Figure 6, 1Lllll! of the two-line power transmission line! The case where l is an R-phase, S-phase failure and 2nd side is an R-phase failure will be explained with reference to the block diagram of FIG.

Since the 1L side is a 2-phase failure group, in order to perform medium-speed three-phase reclosing, the remaining phase, the T phase, is temporarily connected to ORG1-OR.
3, the residual phase is cut off to bring the three-phase cutoff state as shown in FIG. 7, and an input is given to a preset no-voltage time confirmation timer 79TB2.

On the 2nd side, since it is a 1-phase failure on a per-line basis, the no-voltage time confirmation timer 79TIl11 is set in advance.
After counting, along with the conditions for own Pi11 phase failure,
A high-speed single-phase reclosing is performed through the AND gate AN[)1 and the OR gate ORI.

On the 1 side, the high-speed single-phase reclosing occurred on the 2 side, and the three-phase common power flow was restored, and it was confirmed that the bus voltage ``Yes'' and the line voltage ``No j'', which are the reclosing conditions for that side, were confirmed. , the no-voltage time confirmation timer 79TB2 counts 1, and medium-speed three-phase re-closing is performed via the AND gate 8ND2 and the OR gate 0rt1.

If the conditions for high-speed single-phase reclosing are not satisfied for some reason, the human power of knot gate NOT 1 is "0", so its output becomes "1", and the high-speed single-phase recirculating After counting the closed circuit giving up time w1 recognition timer 797B3, AND gate 8ND3, or game 1-0R2
The final cutoff is carried out via the 1st phase, and the residual phase cutoff of the remaining phase is carried out.

In addition, if even one of the medium speed three-phase reclosing conditions is not satisfied for some reason, the knot gate NOT 2
Since the input of is "0", its output is "1",
After counting by medium speed three-phase reclosed hoof time confirmation timer 79TB4, ND4 to Ando Goo Mill, OR gate OR
The final cutoff occurs via 2.

[Problems with Background Art] Next, a system to which the present invention is applied will be described. Considering the impact on the generator connected to the power transmission line, the final cutoff should be a three-phase failure in two circuits (for example, a case where the 1L side has an R-phase failure, the S-phase failure, and the 2L side has a T-phase failure). In other words, a case where the failure mode as shown in FIG. 10 is the final cutoff will be explained using the block diagram of FIG. 9. 9th
The block diagram shown in the figure is obtained by inserting a three-phase cutoff condition for a total of two lines into the final cutoff condition of the block diagram of FIG. 8 described above via OR games 1 to OR4. The other configurations are the same as those shown in FIG.

As shown in Figure 6, the failure condition is shown in Figure 6.
It is assumed that the R-phase and S-phase failures occur on the side, and the R-phase failure occurs on the 2L side.

Since there is a two-phase failure on the 1L side, in order to perform medium-speed three-phase reclosing, the remaining T phase is temporarily connected to the OR gate OR3.
The remaining phase is cut off through the 3-phase cutoff state shown in FIG. 7, and an input is given to a preset no-voltage time confirmation timer 79TB2.

On the 2L side, it is a 1-phase failure in each line, so after counting by the preset no-voltage time confirmation timer 79B1, the AND gate 8NI) is executed along with the own line 1 phase/& failure condition. , attempts to perform high-speed single-phase reclosing via OR gate OR1.

At this time, the high-speed single-phase reclosing on the 2L side is for a short time, but because it goes through the no-voltage time confirmation timer 79TB1, the 1L
The residual phase cutoff on the side precedes the cutoff, and as shown in FIG. 7, the 1st side cuts off the 3 phases before the 2nd side performs high-speed single-phase reclosing. At this point, it is determined that the final cutoff condition is 3-phase cutoff for the total of 2 lines, and through ORGame 1 to OR4,
The 1L side and the 2[ side are finally cut off, and the medium-speed three-phase reclosing on the 1L side and the high-speed single-phase reclosing on the 2[ side, which should originally be performed, become impossible.

[Object of the Invention] The present invention has been made to solve the above problems, and provides a protective joint that can reliably perform medium-speed three-phase reclosing on the 1L side and high-speed single-phase reclosing on the 2L side. The purpose is to provide electrical equipment.

[Summary of the Invention] In the present invention, a breaker recovery condition due to completion of high-speed single-phase reclosing on the 2L side is added to the residual phase cutoff condition on the 1L side, and
After the breaker on the side has reliably recovered, the remaining phase is cut off on the 1L side, and it is possible to carry out medium-speed three-phase re-111 path on the 1-side side and high-speed single-phase reclosing on the 2-side side. It is.

[Embodiment 1 of the invention Examples will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a reclosing device used in a protective relay device according to the present invention.

In FIG. 1, the same parts as in FIG. 9 are given the same reference numerals.

In this embodiment, the recovery condition of the breaker of the adjacent line is added to the remaining phase cutoff condition due to the own line two-phase cutoff shown in FIG. 9 by AND. The other configurations are the same as those shown in FIG. 9.

If the 1L side of the two-line power transmission line shown in Figure 6 has an R-phase or S-phase failure,
The case where the 2L side has an R-phase failure will be explained with reference to FIG.

Since there is a two-phase discharge on the 1V- side, in order to perform medium-speed three-phase reclosing, the remaining T phase is temporarily cut off to provide input to AND gates AND 5 and AND 6. However, the breaker condition of the adjacent line will not be restored until the high-speed single-phase reclosing on the 2L side is completed, so the AND gate ^NO
5, its output becomes "1", locks AND gate AND 5 through NOT gate NOT 3, waits for residual phase cutoff, and inputs to a preset no-voltage time confirmation timer 791B2. give.

On the other hand, on the 2L side, the remaining phase is cut off on the 1L side until the breaker condition on the 2L side is restored, so the final cutoff condition, which is the total of 2 lines, does not correspond to the 3-phase failure condition, and 1 line Since it is a one-phase failure in terms of units, after counting by the preset no-voltage time confirmation timer 79TB1,
Along with the condition of own line 1 phase failure, AND gate AND1.
Perform high-speed single-phase reclosing via OR gate OR1,
This results in the cutoff condition shown in Figure 3.

On the 1L side, the 15 disconnection condition on the 2L side is restored (1 flame, AND gate ANI) 6 output becomes "O", NOT gate NOT 3, AND gate AND 5, OR game 1~
Residual phase cut-off is performed via OR3, resulting in the cut-off mode shown in FIG.

Therefore, the condition of three-phase failure does not apply to the final cutoff condition of two-line combination, and the three-phase co-circulation flow of the adjacent circuit has been restored due to high-speed single-phase reclosing on the 2L side, and under other reclosing conditions. When it is confirmed that a certain bus' voltage is ``present'' and line voltage is ``absent,'' and after counting by the no-voltage time confirmation timer 791B2, a medium-speed three-phase reclosing circuit is executed via the AND game 1, AND 2, and the OR game hOR1. .

If the high-speed single-phase reclosing condition on the 2L side is not satisfied for some reason, the knot game 1-NOTI
Since the input of is "0", its output is "1",
After counting by high-speed single-phase reclosing time confirmation timer 79TB3, AND gate A11D3, OR gate OR
2, it becomes the final cutoff and carries out residual phase cutoff of the remaining phase. When the remaining phase is cut off on the 2[ side, the final cutoff condition is 3 phase cutoff for the 2 circuits on the 1L side.
is satisfied, final cutoff is performed and residual phase cutoff of the remaining phase is performed.

In addition, if even one of the medium speed three-phase reclosing conditions on the 1 side is not satisfied for some reason, the input of NOT gate NOT 2 is "0", so its output is "1".
”, and the medium speed three-phase reclosing time confirmation timer 79T
After counting by B4, final shutoff occurs via AND gate ΔND4 and OR gate OR2.

[Effects of the Invention] As explained above, according to the present invention, it is possible to perform a single-speed, single-phase page 1 path and a medium-speed three-phase reclosing circuit, such that a three-phase failure is the final cutoff for a total of two circuits. In a reclosing device, when a failure occurs across two lines that do not meet the final cutoff conditions, the remaining phases of the line with two or more failed phases are cut off until the line with only one phase in failure completes high-speed single-phase reclosing. By making it standby, it is possible to provide a protective relay device that does not require a double practice tool and does not cause final cutoff.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the re-closing device used in the protective relay device according to the present invention; Fig. 2 is a diagram showing the 1LIIIR and S phases in a cut-off state to explain the aspect of the ladder 1gi; Fig. 3 Similar to Figure 2, is a diagram explaining the cutoff mode,
Figure 4 is a diagram showing the three phases of 1L (llI!R, SST are in a cut-off state).
The failure state diagram of the R phase on the 1L side and the S phase on the 2L side, Figure 5 is a system diagram explaining the failure aspects of the power transmission line, and the failure state diagram of the R and S phases on the 1L side, Figure 6 shows the failure aspects of the power transmission line. Figure 7 is a diagram explaining the details of reclosing, and is a failure state diagram of IL[1llJR, S phase, and R phase on the 2L side. R, S, T phase, 2nd side R phase M
14 state diagram, FIG. 8 is a conventional polyphase reclosing block diagram, and FIG. 9 is a polyphase reclosing block diagram to which the present invention is applied.
FIG. 0 is a diagram illustrating the state of the power transmission line being cut off. AND 1-6...AND gate OR1-4...NO'r to A-1 1-3...Knot gate 79TB1...High-speed single-phase reclosing no-voltage time count-on delay imuff 9TB2 ...Medium speed three-phase reclosing no-voltage time count-on delay timer 79 T B 3 ... High-speed single-phase reclosing giving up time count-on delay timer 797B4 ... Medium speed three-phase reclosing giving up time Callan 1-
On-delay timer Figure 1 Figure 2 Figure 3 Figure 7 Figure 8

Claims (1)

[Claims] In a protective relay device installed on a two-circuit power transmission line, a re-closing device equipped with a high-speed single-phase reclosing function and a medium-speed three-phase reclosing function, in which a three-phase failure in two circuits is the final cutoff, is installed on a two-circuit power transmission line. In the event of a failure that spans two lines that do not meet the final cutoff conditions, the remaining phase cutoff on the line side where two or more phases have failed is put on standby, and one
A protective relay device characterized in that, on the condition that high-speed single-phase reclosing on the line side of a phase failure is completed, remaining phase cutoff of the line side of the line side of the two or more phase failure is carried out.