JPH07106018B2 - System accident recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a system fault recording system, and more specifically, a device for recording a system fault phenomenon in a power receiving and transforming facility adopting a two-bus system. Regarding

<Prior art> In the power receiving and transforming equipment which has been of high importance from the past, as shown in Fig. 4, one end of each of the two buses (21) and (22) is connected by a breaker (23). ing. Then, each bus bar (21) (22) is selectively connected by a disconnecting switch (24) (24), a circuit breaker (25) is interposed, and a transformer (26) is interposed as necessary. A voltage supply line (27) is provided. Further, the capacitor type instrument transformer (28) is attached to each of the bus bars (21) and (22), and the current transformer (29) is attached to each of the voltage supply lines (27). Each of the above capacitor-type instrument transformers (2
The voltage of each bus bar (21) (22) detected by 8) and the current flowing through each voltage supply line (27) detected by each current transformer (29) are supplied to the accident recording device (30). ing.

In the conventional system fault recording method that employs the above configuration, the bus voltage is converted to the capacitor type transformer (2
8) Always detect and start the accident recording device (30) on condition that the bus voltage has dropped to a specified value and the rate of change of voltage is more than the specified value. , Power, etc. can be recorded.

Therefore, after that, the recorded data and the simulation result are collated to analyze the situation such as an accident.

<Problems to be Solved by the Invention> In the system fault recording method described above, it is determined that the system fault has occurred simply based on the voltage drop of the bus and the voltage change rate, and the bus voltage and the power at that time. Therefore, for example, even when the power supply to one of the busbars is stopped after the connection state between the busbars is cut off by the circuit breaker (23) for inspection, etc. However, there is a problem that the accident recording device (30) is started by mistakenly determining that an accident has occurred, and unnecessary data is recorded. Regarding this point, if the frequency of accidents is significantly higher than the frequency of inspections, it does not matter so much, but in reality, the frequency of inspections is significantly higher than the frequency of accidents. The amount of data that must be omitted when performing a situation analysis at the time of an accident will be significantly larger, and it takes time and effort to determine whether or not the data should be omitted. , It is a problem that cannot be ignored.

Therefore, in order to prevent such problems from occurring,
The activation of the accident recording device (30) can be locked manually by the operator.
In this case, the start lock operation and the start lock release operation are required, and there is a problem that the operation becomes complicated, and in addition to the operation being complicated, the start lock operation and the start lock operation are performed. There is a problem of forgetting the unlock operation.

<Objects of the Invention> The present invention has been made in view of the above problems,
It is an object of the present invention to provide a system fault recording method capable of recording voltage, power, etc. only when a true system fault occurs.

<Means for Solving Problems> In order to achieve the above-mentioned object, the system accident recording device of the present invention determines that the bus bar is not used when the voltage value of the bus bar is lower than the reference value for a certain period of time. Each bus bar is provided with a use / nonuse determination means (3, 4) for determining that the busbar voltage is higher than the reference value for a certain period of time and determining that the busbar is used. According to (3, 4), when one bus bar is judged to be unused, a system fault is detected based on the voltage drop of the other bus, and when it is judged that both bus lines are used, A starting signal generating means (5) for detecting a system fault based on a logical product of busbar voltage drop of the busbar and a recording means for receiving the starting signal from the starting signal generating means (5) and recording the system fault. , The above-mentioned use / non-use determination means (3, 4) is The judgment circuit (31) that judges whether the voltage value of the phase has dropped below the reference value, the time limit circuit (33) that outputs when the judgment state of the judgment circuit (31) continues for a certain time, and all of the busbars. A judgment circuit (32) for judging whether the phase voltage value is higher than a reference value, a time limit circuit (34) for outputting when the judgment state of the judgment circuit (32) continues for a certain time, and the time limit circuit (33). ), Which holds an output indicating the use of the bus bar based on the output of the above), and a holding circuit (35) which holds an output indicating the non-use of the bus line based on the output of the time limit circuit (34), The generating means (5) provides an AND circuit (51) for opening a gate with an output indicating the use of the use / nonuse determining means (3) provided on one bus bar (21) and another bus bar (22). The gate is opened by the output indicating the use of the use / nonuse determination means (4) provided. And Riseki circuit (53),
An AND circuit (52) that opens a gate by an output indicating the non-use of the use / non-use determination means (3) provided on one bus bar (21) and the above-mentioned non-use circuit provided on another bus line (22). A logical product circuit (54) for opening a gate by an output indicating non-use of the use determining means (4), an undervoltage judgment output of one busbar (21) passing through the logical product circuit (51), and the logical product circuit A logical product circuit (55) for performing a logical product with the undervoltage determination output of the other bus bar (22) that has passed through (53), and the logical product circuit (5
1) and (54) undervoltage judgment output of one busbar (21), undervoltage judgment output of the other busbar (22) passing through the AND circuits (53) and (52), or the above logic A logical sum circuit (56) for generating a start signal based on any one of the outputs of the product circuit (55) (claim 1).
The system fault recording method of the second invention is different from the first invention in that the system fault is detected based on the voltage fluctuation of the bus bar instead of detecting the system fault based on the voltage drop of the bus line. Only (claim 2).

<Operation> The above system fault recording device of the present invention is applied to the power receiving and transforming equipment adopting the two-bus system to reduce the voltage of the system.
Alternatively, when recording a system fault using the voltage change rate as the starting condition, it is determined whether each bus bar is used or not, based on the continuation of the voltage drop, and the voltage drop and voltage change are determined based on the result of the judgment. Since the system fault is recorded by using the rate as the starting condition, the voltage drop of the operating bus bar not only when both bus lines are operating but also when only one bus line is operating, And the system fault can be recorded by using the voltage change rate as the starting condition. That is, when the bus bar is operated for inspection or the like, the voltage, electric power, etc. are not recorded, but the voltage, electric power, etc. can be recorded only when a true accident occurs.

<Example> Hereinafter, detailed description will be given with reference to the accompanying drawings illustrating an example.

FIG. 4 is an electric circuit diagram showing the electrical configuration of the two-bus-type power receiving and transforming equipment. Two ends of the two-system busbars (21) and (22) are connected by a breaker (23). . Then, each bus bar (21) (22) is selectively connected by a disconnecting switch (24) (24), a circuit breaker (25) is interposed, and a transformer (26) is interposed as necessary. Voltage supply line (27)
(27) is provided. Further, the transformers (28) (28) for capacitor type instruments are attached to the bus bars (21) (22), and the current transformers (29) are attached to the voltage supply lines (27). Is attached to each bus bar (21) (2) detected by the above-mentioned capacitor type instrument transformer (28).
The voltage of 2) and the current flowing through each voltage supply line (27) detected by each of the above current transformers (29) are used as an accident recording device (3
0).

In the conventional system fault recording method that employs the above configuration, the bus voltage is converted to the capacitor type transformer (2
8) Always detect and start the accident recording device (30) on condition that the bus voltage has dropped to a specified value and the rate of change of voltage is more than the specified value. , Power, etc. can be recorded.

FIG. 1 is an electric circuit diagram showing an embodiment of the first invention. As shown in FIG. 1A, the voltage detection signals UV of both buses (21) and (22) (where UV is the bus voltage is (It becomes "0" in a certain state, and becomes "1" when there is no bus voltage).
Is supplied to the AND gate (1), and the output signal from the AND gate (1) is supplied to the accident recording device (30) as a start signal.

Further, FIG. 9B shows a voltage change rate detection signal ΔV for both buses (21) and (22) (where ΔV is “1” when the voltage change rate is equal to or higher than a predetermined value, and the voltage change rate has a predetermined value. If it does not exceed "0", "0" is supplied to the AND gate (2), and the output signal from the AND gate (2) is supplied to the accident recording device (30) as a start signal.

Therefore, in the case of FIG. A, the accident recording device (30) can be activated only when the voltage detection signals UV of both buses (21) and (22) are both “1”. In addition, the accident recording device (30) can be activated only when the voltage change rate detection signals ΔV of both buses (21) and (22) are both “1”. Incidentally, the voltage drop and the voltage change rate in the case of A and B in the same figure may be detected based on each phase voltage, or may be detected based on the line voltage. Good.

To explain in more detail, in the busbar configuration for normal operation, the circuit breaker (23) for connecting the busbars is operated in the ON state, so the voltage of both busbars (21) (22) is When the operation of one busbar (21) is stopped, the voltage of the busbar (22) does not change at all, and the voltage of the busbar (21) is lowered by the busbar operation, as shown in FIG. 2A. Then, only the induced voltage remains and the voltage becomes zero when the earthing switch is turned on.

If an accident occurs on the other bus bar (22), the voltage on the bus bar (21) will change from the occurrence of the accident until the breaker (23) turns off, as shown in Fig. 2B. Only during the period from the occurrence of the accident until the breaker (23) is turned off, only the induced voltage remains,
After the breaker (23) is turned off, the voltage becomes lower than the above-mentioned induced voltage.

In addition, when a general accident occurs due to an external factor, as shown in FIG. 2C, the voltage of both busbars (21) and (22) is from the occurrence of the accident until the breaker (not shown) is turned off. It drops sharply only during the period.

Therefore, in the case of FIG. 2A, since the AND gate (1) or the AND gate (2) outputs a low level signal, the accident recording device (30) is not activated and no recording operation is performed. It will be.

On the contrary, in the case of FIGS. 2B and 2C, since the AND gate (1) or the AND gate (2) outputs a high level signal, the accident recording device (30) is activated and the voltage at the time of the accident , Electricity, etc. will be recorded.

That is, it is possible to record the voltage, electric power, etc. only when an accident actually occurs, and when the bus bar operation is performed for inspection etc., no recording operation is performed. Based on the above, it is possible to analyze the situation at the time of an accident by collating with the simulation result.

FIG. 3 is an electric circuit diagram showing an embodiment of the second invention, which is a use / non-use judging section (3) (4) for each bus bar, a start signal generating section (5) based on a voltage drop, and It is composed of a start signal generation unit (6) based on the voltage change rate.

The use / non-use determination unit (3) is configured to detect the voltage drop detection signals UV1, UV2, UV3 of the respective phases of the bus bar (21) (however, UV1, UV2, UV3 are
"0" when there is a bus voltage and "1" when there is no bus voltage) is being supplied to the AND gate (31) and the NOR gate (32),
The output signal from the AND gate (31) is supplied to the reset terminal of the latch circuit (35) through the timer (33), and the output signal from the NOR gate (32) is supplied through the timer (34) to the latch circuit ( It is supplied to the set terminal of 35).

Therefore, "1" of the above voltage drop detection signals UV1, UV2, UV3
A signal ("0") indicating that the bus bar (21) is unused by resetting the latch circuit (35) while the status has continued for a predetermined time or more determined by the timer (33).
Is generated and supplied to the activation signal generation unit (5). Conversely, when the voltage drop detection signals UV1, UV2, UV3 are "0", the timer (3
By setting the latch circuit (35) for a predetermined time or more determined by 4), a signal (“1”) indicating that the bus bar (21) is in use is generated, and the start signal generation unit (5 ) To.

Further, since the configuration of the use / non-use determination unit (4) is the same as the configuration of the use / non-use determination unit (3), detailed description thereof will be omitted.

The activation signal generation unit (5) is an AND gate (5) opened by the use determination signal from the use / non-use determination unit (3).
1), AND gate (52) opened by non-use discrimination signal,
AND gate (53) opened by the use discrimination signal from the use / non-use discrimination unit (4), AND gate (54) opened by the non-use discrimination signal, output signals from the AND gates (51) (53) Of the AND gates (52), (54) and (55), and an OR gate (56) that outputs a start signal.

More specifically, the AND gates (51) (53)
Since the voltage drop detection signals UV of the bus lines (21) and (22) are supplied to each of them, the voltage drop detection signal UV can be output from the corresponding AND gate only when the bus lines are in use. And both AND gates (51) (53)
Since the output signal from is supplied to the AND gate (55), the high level signal is output only when the high level voltage drop detection signal UV is output from both AND gates (51) and (53).
Can be supplied to the OR gate (56). Also, the above AN
D gates (52) (54) have AND gates (51) (5
Since the output signal from 3) is supplied, the bus bar (21)
In accordance with the unused state of (22), AND gate (5
3) A high level signal can be output from the AND gates (52) (54) and supplied to the OR gate (56) only when the high level voltage drop detection signal UV is output from the (51).

Therefore, when both buses (21) and (22) are in use, the AND gates (51) and (53) can be operated only when the voltage drop detection signals UV of both buses (21) and (22) are both "1". An activation signal can be output through (55) and an OR gate (56).

Busbar (21) if only busbar (21) is in use
AND gate (51) when the voltage drop detection signal UV of is “1”
An activation signal can be output through (54) and an OR gate (56).

Busbar (22) if only busbar (22) is in use
AND gate (53) when the voltage drop detection signal UV of is “1”
An activation signal can be output through (52) and an OR gate (56).

That is, not only when both busbars (21) (22) are in use, but also when only one busbar is in use, the activation signal based on the voltage drop for activating the accident recording device (30). Can be generated.

The activation signal generation unit (6) is an AND gate (6) opened by the use determination signal from the use / non-use determination unit (3).
1), AND gate (62) opened by non-use discrimination signal,
AND gate (63) opened by the use discrimination signal from the use / non-use discrimination unit (4), AND gate (64) opened by the non-use discrimination signal, output signals from the AND gates (61) (63) Of the AND gates (62), (64) and (65), and an OR gate (66) which outputs a start signal.

More specifically, the AND gates (61) (63)
Since the voltage change rate detection signals ΔV of the buses (21) and (22) are supplied to each of them, the voltage change rate detection signal ΔV is received from the corresponding AND gate only when the bus is in use.
Can be output. And both AND gates (61)
Since the output signal from (63) is supplied to the AND gate (65), the high level signal is output only when the high level voltage change rate detection signal ΔV is output from both AND gates (61) and (63). Can be supplied to the OR gate (66). The output signals from the AND gates (61) and (63) are supplied to the AND gates (62) and (64), respectively, so that the AND gates (62) and (64) are ANDed according to the unused states of the bus lines (21) and (22).
AND gates (62) (64) only when the high level voltage change rate detection signal ΔV is output from the gates (63) (61)
A high level signal can be output from and supplied to the OR gate (66).

Therefore, when both buses (21) and (22) are in use, the AND gates (61) (63) are provided only when the voltage change rate detection signals ΔV of both buses (21) and (22) are both “1”. ) (65),
And the activation signal can be output through the OR gate (66).

Busbar (21) if only busbar (21) is in use
When the voltage change rate detection signal ΔV of the AND gate (6
1) A start signal can be output through (64) and an OR gate (66).

Busbar (22) if only busbar (22) is in use
When the voltage change rate detection signal ΔV of the AND gate (6
3) A start signal can be output through (62) and OR gate (66).

That is, the activation based on the voltage change rate for activating the accident recording device (30) not only when both busbars (21) and (22) are in use but also when only one busbar is in use. A signal can be generated.

Therefore, the AND gates (55) (52) (54) are selectively operated in response to the case where both the buses (21) (22) are in the operating state, and the case where only one of the buses is in the operating state. It outputs the voltage drop detection signal UV or the AND gate (6
5) (62) and (64) selectively output the voltage change rate detection signal ΔV.

Then, the accident recording device (30) can be activated by outputting the voltage drop detection signal UV or the voltage change rate detection signal ΔV as the activation signal.

That is, when both busbars (21) (22) are in the operating state, one busbar voltage may decrease due to busbar operation.
As in the case of the first aspect of the invention, since the start signal is generated based on the logical product condition of the voltage drop detection signals of both buses or the logical product condition of the voltage change rate detection signals, when a true accident occurs, Only the accident can be recorded.

When only one of the buses is in the operating state, the bus operation is not performed (in order to stabilize the voltage supply). Therefore, the voltage drop detection signal UV of the operating bus, or Can generate an accident record by generating a start signal based only on the voltage change rate detection signal ΔV.

It should be noted that the present invention is not limited to the above embodiments, and it is possible to achieve the same function by using a microcomputer instead of forming a specific electric circuit by combining logic circuits, for example. Besides, it is possible to make various design changes within the scope of the present invention.

<Effects of the Invention> As described above, according to the first or second invention, a true accident occurs not only when both buses are in the operating state but also when only one bus is in the operating state. Since the activation signal for recording the accident is output only when the accident occurs, there is a peculiar effect that only the data necessary for the situation analysis at the time of the accident can be recorded.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the first invention, FIG. 2 is a diagram for explaining a voltage change of both buses, and FIG. 3 is an electric circuit diagram showing an embodiment of the second invention. FIG. 4 is an electric circuit diagram showing the electrical configuration of the 2-bus type power receiving and transforming facility. (1) (2) …… AND gate, (3) (4) …… use,
Non-use determination unit, (5) (6) ... Activation signal generation unit

Continuation of the front page (56) Reference JP-A-60-174016 (JP, A) JP-A-48-28942 (JP, A) Actually-opened Sho-58-22048 (JP, U) JP-B-57-19658 (JP , B2) Susumu Kobayashi "Protective relay technology" (Sho 47-10-15) Denki Shoin P. 280-281

Claims (2)

[Claims] 1. A device which is applied to a power receiving and transforming facility adopting a two-bus system and records a system fault with a system voltage drop as a starting condition, and a state in which a bus voltage value is lower than a reference value for a certain period of time. Each bus bar is equipped with a use / non-use determination means (3, 4) that determines that the bus bar is not used when it continues and determines that the bus bar is used when the voltage value of the bus bar is higher than the reference value for a certain period of time. If one of the busbars is judged to be unused by the above-mentioned use / nonuse determination means (3, 4), a system fault is detected based on the voltage drop of the other busbars, and both busbars are used. If it is determined that the system fault occurs, a start signal generation means (5) for detecting a system fault based on a logical product of bus voltage drops of each bus and a start signal from the start signal generation means (5) are received. And a recording means for recording Another means (3, 4) is a judgment circuit (31) for judging whether or not the voltage values of all the phases of the bus bar have fallen below a reference value, and when the judgment state of the judgment circuit (31) continues for a certain period of time. Outputs the time limit circuit (33), the judgment circuit (32) that judges whether the voltage values of all the phases of the bus bar are higher than the reference value, and when the judgment state of the judgment circuit (32) continues for a certain period of time. Hold the output indicating the use of the bus bar based on the output of the time limit circuit (34) and the time limit circuit (33), and hold the output indicating the non-use of the bus line based on the output of the time limit circuit (34) A holding circuit (35), and the activation signal generation means (5) is a logical product for opening the gate by an output indicating the use of the use / nonuse determination means (3) provided on one bus bar (21). The circuit (51) and the use / nonuse determination means (4) provided on the other bus bar (22) are used. A logical product circuit (53) to open the gate by the shown output,
An AND circuit (52) that opens a gate by the output indicating the non-use of the use / non-use determination means (3) provided on one bus bar (21) and the non-use circuit provided on another bus line (22). A logical product circuit (54) for opening a gate by an output indicating non-use of the use judging means (4), an undervoltage judgment output of one bus (21) passing through the logical product circuit (51), and the logical product circuit A logical product circuit (55) for performing a logical product with the undervoltage determination output of the other bus bar (22) that has passed through (53), and the logical product circuit (5
1) and (54) undervoltage judgment output of one busbar (21), undervoltage judgment output of the other busbar (22) passing through the AND circuits (53) and (52), or the above logic And a logical sum circuit (56) for generating a start signal based on any one of the outputs of the product circuit (55). 2. A device for recording a system fault, which is applied to a power receiving and transforming facility adopting a two-bus system and uses a voltage fluctuation of the system as a starting condition, and a state in which the voltage value of the bus is lower than a reference value for a certain period of time. Each bus bar is equipped with a use / non-use determination means (3, 4) that determines that the bus bar is not used when it continues and determines that the bus bar is used when the voltage value of the bus bar is higher than the reference value for a certain period of time. When one of the busbars is judged not to be used by the above-mentioned use / nonuse determination means (3, 4), the system fault is detected based on the voltage fluctuation of the other busbars, and both busbars are used. If it is determined that the system fault occurs, a start signal generating means (6) for detecting a system fault based on a logical product of bus voltage fluctuations of each bus and a start signal from the start signal generating means (6) are received. And a recording means for recording Another means (3, 4) is a judgment circuit (31) for judging whether or not the voltage values of all the phases of the bus bar have fallen below a reference value, and when the judgment state of the judgment circuit (31) continues for a certain period of time. Outputs the time limit circuit (33), the judgment circuit (32) that judges whether the voltage values of all the phases of the bus bar are higher than the reference value, and when the judgment state of the judgment circuit (32) continues for a certain period of time. Hold the output indicating the use of the bus bar based on the output of the time limit circuit (34) and the time limit circuit (33), and hold the output indicating the non-use of the bus line based on the output of the time limit circuit (34) A holding circuit (35), and the activation signal generation means (6) is a logical product for opening a gate by an output indicating the use of the use / nonuse determination means (3) provided on one bus bar (21). Use of the circuit (61) and the use / nonuse determination means (4) provided on the other bus bar (22). A logical product circuit (63) to open the gate by the shown output,
An AND circuit (62) that opens a gate by an output indicating the non-use of the use / non-use determination means (3) provided on one bus bar (21) and the above-mentioned non-use circuit provided on another bus line (22). A logical product circuit (64) that opens a gate by an output indicating non-use of the use determining means (4), a voltage fluctuation determination output of one bus bar (21) that has passed through the logical product circuit (61), and the logical product circuit A logical product circuit (65) for performing a logical product with the voltage fluctuation determination output of the other bus (22) that has passed through (63), and the logical product circuit (6
1) and (64) one bus (21) voltage fluctuation judgment output, the other bus (22) voltage fluctuation judgment output that passed the AND circuits (63) and (62), or the above logic And a logical sum circuit (66) for generating a start signal based on any of the outputs of the product circuit (65).