JPH089550A - Distribution gear - Google Patents

Abstract

PURPOSE:To perform surely the exchange of information on faults between slave stations during the service interruption of the power supply of a power system, by setting the transmission reference value of a zero-timting slave station which serves as the reference of the voltage comparison for the shifting to its transmission lower than the reception reference value of a fixed-timing slave station, and by making the zero-timing slave station shift to its transmission after the fixed-timing slave station shifts to its reception. CONSTITUTION:When a service interruption is detected by sensors 12, 13, the sensed voltage value is compared in a digital way with a transmission reference value by a control part 17 of a zero-timing slave station 7. When the lower voltage value on the side of a power supply than the transmission reference value is sensed, a switch 18 is closed and the zero- timing slave station reports a fault information to a fixed-timing slave station 6. On the other hand, the control part 16 of the fixed-timing slave station 6 compares the reception reference value with the sensed voltage value in a digital way, and when the lower sensed voltage value than the reception reference value is sensed, the fixed-timing slave station 6 receives the fault information transmitted by the zero-timing slave station 7. Further, the transmission reference value of the zero-timing slave station 7 is set lower than the reception reference value of the fixed-timing slave station 6. Thereby, the zero-timing slave station 7 shifts to its transmission after the fixed-timing slave station 6 shifts to its reception. As a result, the exchange of information on faults can be performed surely between the slave stations 6, 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution line carrier type communication function and control of a distribution switch as a so-called control slave station for each distribution switch that divides a distribution line drawn from a substation into a plurality of sections. The present invention relates to a power distribution facility in which a timed slave station and a zero timed slave station having functions are alternately provided.

[0002]

2. Description of the Related Art Conventionally, this type of power distribution equipment is constructed as shown in FIG. The drawing corresponds to one embodiment of the present invention,
Next, the conventional equipment will be described with reference to FIG. The distribution line 2 drawn from the substation 1 has a plurality of division switches 3
Are divided into a plurality of sections # 1, # 2 ,.

The substation 1 is provided with a computer-configured master station 4 for collecting information, remote control, etc. by means of distribution line carrier communication, and a computer-configured substation slave station 5 as a first slave station. . In addition, a timed slave station 6 and a zero-time slave station 7 having a computer configuration are alternately provided for each of the partition switches 3, and these slave stations 6 and 7 are the partition switch 3 of their own station.
The system power source is supplied via the power source side (substation side) and the load side transformers 8 and 9.

The timed slave station 6 requires a certain time period, for example, 7 N seconds, from receiving power to turning on the classification switch 3 of its own station, and the zero timed slave station 7 receives power immediately and immediately receives its own station. The division switch 3 is turned on. In addition, the fixed time period is 7N
The timed slave station 6 having (N is an arbitrary integer) seconds is also called a 7N second slave station, and the zero timed slave station 7 is also called a 0 second slave station.

Further, the section # in which the zero time code station 7 is provided
An accident detection sensor 10 is provided in the vicinity of the load side of the section switches 3, 2, # 4, ... And this sensor 10 sends current detection information as accident data to the zero time slave station 7 in the section.
Then, the slave stations 6 and 7 collect the system voltages of the power supply side and the load side through the transformers 8 and 9 by their respective power failure detection units, compare them with the reference value of the power failure detection, short circuit, ground fault, etc. Monitor the occurrence of a power outage.

Next, when an accident such as a short circuit or a ground fault occurs in any of the sections, the circuit breaker of the substation 1 is opened, and the power distribution system has a power failure (accident power failure), each section switch 3 has a fixed time period. To open automatically. In addition, the slave stations 6 and 7 each detect a system power failure by their respective power failure detecting units, and conventionally, relay operation is performed to confirm the accident power failure and transmit / receive accident information based on the detection data of the sensor 10 and the like.

That is, when the zero-time slave station 7 detects a system power failure by its own power failure detection unit, if N = 1, an accident occurs depending on whether the following (i) or (ii) power failure condition is satisfied. Determine if there is a power outage.

(I) A power failure condition of 2 seconds or more occurs within 5.5 seconds after the detection data of the sensor 10 is received by the power failure detection. (Ii) Receive the detection data from the sensor 10 within 500 milliseconds after the power failure continues for 2 seconds or more.

In the case of an accident power failure, the fault point is the power supply side or the load side of the classification switch 3 of the own station based on the detection data of the sensor 10 and the power supply side of the classification switch 3 of the own station and the system voltage of the load side. Determine whether.

Further, after the detection of the system power failure of the power failure detection unit,
Conventionally, the relay operation confirms that the system voltage on the power supply side of the own station has fallen to a set value and is in a power failure state, and then shifts to transmission of accident information, based on the detection data of the sensor 10 and this data. The determination result of the accident point is injected into the distribution line on the power supply side of the own station as accident information, and is transmitted to the timed slave station 6 on the power supply side recently during a power failure.

Further, when the timed slave station 6 detects a system power failure by the power failure detection unit of its own station, conventionally, after this detection, the system voltage on the load side of its own station drops to the set voltage and goes into a power failure state. Confirm the fact by relay operation, and proceed to receive accident information. Then, the accident information transmitted from the zero-timer station 7 on the load side by the distribution line transportation method is received.

Next, the circuit breaker of the substation 1 is repeatedly turned on and off, or the timed slave station 6 is controlled based on the accident information, so that the section switch 3 of the timed slave station 6 immediately before the accident point is opened and locked. , When the accident section is separated and each healthy section on the power supply side recovers power, the accident information received by the timed slave station 6 immediately before the accident point during a power failure by polling or spontaneous transmission from the master station 4 To the master station 4. Then, based on this notification, the substation 1 grasps the details of the accident.

[0013]

In the case of the conventional power distribution equipment of the above-mentioned type, the relay operation confirms the power failure of the transmission / reception of the accident information of the slave stations 6 and 7, and the transmission / reception transition which is the reference of this operation. The set value (voltage) of is set individually. In the relay operation, generally, a relatively large variation in operating voltage is likely to occur.

Therefore, even if the set values of the slave stations 6 and 7 are set to the same voltage, for example, a motor load exists on the distribution line,
When a certain amount of system voltage remains immediately after the occurrence of a power failure, based on the remaining voltage and the variation in the operating voltage of the relay operation, even if the zero-time slave station 7 shifts to the transmission during an accident power failure, the time-limited slave station A situation occurs in which 6 does not shift to reception.

Therefore, there is a problem in that the accident information cannot be reliably transmitted and received between the slave stations 6 and 7 during the power failure, and the reliability is low. An object of the present invention is to enable reliable transmission / reception of accident information between slave stations 6 and 7 during a power failure of a system power supply.

[0016]

In order to achieve the above object, in the power distribution equipment of the present invention, the communication function of a power distribution line conveying system and the distribution line drawn from the substation are divided into a plurality of sections. Classification of distribution system with switch control function As a control slave station for each switch, it is the own station's classification at a fixed time from the power reception and the timed slave station that switches on the switch and its own station at the zero time from the power reception Alternately set the zero time slave station to turn on the switch,

Each of the timed slave station and the zero timed slave station is provided with a power failure detection unit for monitoring the system voltage on the power supply side and the load side of the own station to detect a power failure, and the zero timed slave station is provided with a power failure of its own station. By detecting the power failure of the power supply side of the station, the system detects the drop of the system voltage on the power supply side below the transmission reference value and shifts to transmission, and outputs the accident information based on the output of the accident detection sensor of the station. Recently, a means to transmit to the timed slave station on the power supply side was provided,

The timed slave station detects a drop in the system voltage on the load side of its own station below the reception reference value by voltage comparison at the time of power failure detection of its own power failure detection unit, and shifts to reception, and outputs error information. A means for receiving is provided and the transmission reference value is set to be equal to or lower than the reception reference value.

[0019]

In the power distribution equipment of the present invention configured as described above, the zero-time slave station and the time-limited slave station do not perform the conventional relay operation, respectively, but confirm the accidental power failure by the voltage comparison and send it.
Move to each reception.

At this time, since the transmission reference value as a reference for voltage comparison of transmission transition of the zero time slave station is set to be less than or equal to the reception reference value as a reference for voltage comparison of the timed slave station, the distribution reference at the time of power failure is set. Regardless of the state of the system voltage of the electric wire, after the timed slave station shifts to reception, the zero time slave station shifts to transmission.
Therefore, transmission of accident information between slave stations during a power outage of the grid power supply,
Receiving can be done reliably.

[0021]

EXAMPLE One example will be described with reference to FIGS. 1A and 1B show a partial configuration of the slave stations 6 and 7 of FIG. 2, and both slave stations 6 and 7 are provided with a power failure detection unit 11 having a digital comparator configuration. This detector 11
Has a power source side detector 12 and a load side detector 13, and both detectors 12 and 13 are an A / D converter 14 and a comparator 1, respectively.
5 is formed.

Then, the detector 12 converts the system voltage on the power source side of the division switch 3 via the transformer 8 into digital data and compares it with a reference value for power failure detection, and checks the system power source on the power source side of the own station. The power failure is monitored and detected, and the detector 13 converts the system voltage on the load side of the sectional switch 3 via the transformer 9 into digital data and compares it with the reference value for power failure detection, and the system on the load side of the own station. Monitors and detects power outages.

Further, the detection outputs of the detectors 12 and 13 and the system voltages on the power supply side and the load side of the own station, which are converted into digital data, are supplied to the control units 16 and 17 of the slave stations 6 and 7 having the microcomputer configuration. It

When the power failure is detected by the detectors 12 and 13 of the own station, the control section 17 of the zero time slave station 7 confirms the accident power failure and shifts to the transmission. Therefore, the power source side of the detector 12 is detected. The digital comparison between the system voltage and the set transmission reference value is performed.

When a drop in the system voltage on the power supply side to the transmission reference value is detected by this comparison, the switch 18 for injection coupling is closed and the injection device 19 for information transmission is coupled to the transformer 2 for coupling.
0, a switch 18, and a transformer 8 to connect to the distribution line 2 on the power supply side of the own station. Once this connection is made, the injection device 19
Transmits and outputs the accident information based on the accident data of the sensor 10 and the like, and notifies it to the timed slave station 6 on the latest power supply side of the own station.

On the other hand, when the power failure is detected by the detectors 12 and 13 of the own station, the control unit 16 of the timed slave station 6 confirms the accident power failure and shifts to reception. Compare the system voltage with the set reception reference value and the digital voltage.

When the system voltage on the load side, that is, the system voltage on the power source side which is recently monitored and detected by the zero-time slave station 7 on the load side is detected by this comparison to be lower than the reference value for reception, it is injected. The switch 21 is closed, and the receiving device 22 for receiving information is connected to the distribution line 2 on the load side of the local station through the transformer 23 for coupling, the switch 21, and the transformer 9.

With this connection, the zero time limit station 7 on the most recent load side
The accident information transmitted from is received by the receiving device 22, and the accident information is taken into the timed slave station 6.

Since the slave stations 6 and 7 are not in the relay operation as in the conventional case, and the accident / power failure is confirmed by the digital voltage comparison and the operation is transferred to the reception / transmission, the slave stations such as the variation in the operation voltage of the relay operation are transmitted. There is no variation between 6 and 7. Further, the transmission reference value serving as the reference for the transmission transition of the zero-time slave station 7 is set to be equal to or less than the reception reference value serving as the reference for the reception transition of the timed slave station 6.

Therefore, even if there is a slight variation in operating voltage between the slave stations 6 and 7 due to component accuracy, etc., the zero-time slave station 7 shifts to transmission after the timed slave station 6 shifts to reception.
Therefore, it is possible to reliably transmit and receive the accident information between the slave stations 6 and 7 during the accident power failure of the system power supply.

[0031]

Since the present invention is configured as described above, it has the following effects. The timed slave station 7 and the timed slave station 6 are not the conventional relay operation respectively,
After the accidental power failure is confirmed by voltage comparison, the transmission and reception are performed respectively. At this time, the transmission reference value as the reference of the voltage comparison of the transmission transition of the zero-time slave station 7 is the voltage comparison of the reception transition of the timed slave station 6. Since it is set below the reception reference value as the reference value of, regardless of the state of the system voltage of the distribution line 2 at the time of power failure,
After the timed slave station 6 shifts to reception, the zero time slave station 7 shifts to transmission, and it is possible to reliably transmit and receive the accident information between the slave stations 6 and 7 during the power failure of the system power supply, Equipment reliability is improved.

[Brief description of drawings]

1A and 1B are block diagrams of a part of a timed slave station and a zero timed slave station of an embodiment of a power distribution facility of the present invention.

FIG. 2 is a block diagram of the overall configuration of an embodiment of the present invention.

[Explanation of symbols]

 2 Distribution line 3 Divided switch 6 Timed slave station 7 Zero time slave station 10 Accident detection sensor 12 Power failure detection section 16, 17 Control section 19 Injection device 22 Receiver

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Michio Chaya, 47 Umezu Takaune-cho, Ukyo-ku, Kyoto City, Nissin Electric Co., Ltd.

Claims (1)

[Claims] 1. A power receiving device as a control slave station for each section switch of a distribution system, which has a communication function of a distribution line transport system and a control function of a section switch that divides a distribution line drawn from a substation into a plurality of sections. , The timed slave station that turns on its own segmented switch at a fixed time and the zero timed slave station that turns on its own segmented switch at the zero time from power reception are installed alternately. Each time limit slave station is equipped with a power failure detection unit that monitors the system voltage on the power supply side and load side of its own station to detect power failure, and the zero time slave station compares the voltage at the time of power failure detection of its own power failure detection unit. Detects a drop in the system voltage on the power supply side of the local station below the transmission reference value and shifts to transmission, and outputs the accident information based on the output of the accident detection sensor of the local station to the time-limited slave station of the local power supply side of the local station. Is provided to the timed slave station to detect the power failure of the power failure detection section of its own station. A means for receiving the accident information by detecting a drop in the system voltage on the load side of the local station below the reception reference value by time voltage comparison and receiving the accident information is provided, and the transmission reference value is set to the reception reference value. Power distribution equipment characterized by the following settings.