JPH08149717A - Power interruption detection control circuit for power receiving/transforming facility - Google Patents

Abstract

PURPOSE: To obtain a power interruption detection control circuit for a power receiving/transforming facility which can detect power interruption of a power receiving/transforming facility and can feed power without interrupting the line for the sound facility at the time of maintenance/inspection or recovering power. CONSTITUTION: When AND 32, 33 conditions are satisfied between the operating signal of a low voltage detector 9 when the disconnector section 3 and circuit breaker 11 for the line 1C on one side and the operating signal of a low voltage detector 10 when power is interrupted due to fault during operation of the line 2C on the other side, a power interruption detecting circuit 18 indicates that power supply is interrupted in a power receiving/transforming facility. The power interruption detecting circuit 18 can detects power interruption even in case of perfect power interruption of the power receiving/transforming facility and can deliver a start command to an emergency power supply facility.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power failure detection control circuit for power receiving and transforming equipment, which detects a power failure during maintenance and inspection.

[0002]

2. Description of the Related Art Electric power drawing in a power receiving and transforming facility requires two lines in order to secure a power failure time for restoration of failures and work safety at the time of maintenance and inspection, and stable power supply to load facilities. There are many places that are above. To ensure work safety during failure recovery and maintenance / inspection, stop the line of the power lead-in facility for failure recovery and maintenance / inspection, disconnect it from the line of other facilities, and use power in healthy facilities below the other power lead-in line. Power is supplied to the pull-in load facility.

[0003]

On the other hand, when the power lead-in line is completely out of service, the low-voltage detectors connected to the secondary side of the instrument transformers provided in the respective power lead-in lines all operate. However, the control power supply for detecting a power failure is usually composed of one power supply, regardless of the number of power supply lines. To ensure safety, it is necessary to turn off the control power supply described above, and even if there is a power outage in the power service line of a healthy facility and a total power outage of the power receiving and transforming facility occurs, there is the inconvenience of not detecting all power outages. It was happening.

[0004] Conventionally, in preparation for the event of a total power outage, personnel are assigned to monitor the presence or absence of voltage on the power lead-in line,
In addition, the entire power receiving and transforming equipment including the sound line equipment was stopped in advance, and measures such as restoration and inspection were taken. As a technique of this kind, Japanese Patent Laid-Open No. 1-157224 can be cited.

As described above, in the prior art, when the restoration and inspection of the power lead-in line are carried out, it is necessary to have a person who monitors the presence or absence of voltage in the healthy line equipment, or there is a possibility of inducing human error. However, there was a problem that the whole power receiving and transforming equipment had to be stopped.

An object of the present invention is to provide a power failure detection control circuit for a power receiving and transforming facility which can detect a power failure in the power receiving and transforming facility.

[0007]

A power failure detection control circuit for power receiving and transforming equipment according to the present invention connects a plurality of lines provided with a disconnecting section, a transformer and a circuit breaker between a power source bus and a common conductor, and connects a plurality of lines. In the power receiving and transforming equipment that provides a voltage transformer for detecting the fault power of the line for each line and operates the low voltage detector connected to the secondary side of the voltage transformer to display the power failure on the display means, Each of the AND circuits, which are output when the operation signal of the low-voltage detector of the side line and the operation signal of the low-voltage detector of the other side line are input, is connected to an independent control power source, and each AN is connected.
A power failure is indicated by the OR signal of the output signals from the D circuit.

[0008]

[Operation] During restoration and maintenance / inspection of the power supply line,
Even if the control power supply of the equipment is stopped, the control power supply of the sound line equipment is not stopped, so that the power failure can be detected and the sound equipment can continue the stable power supply without stopping the control power supply.

[0009]

Embodiments of the present invention will be described below with reference to FIGS.

The two-line power receiving and transforming circuit diagram of FIG. 1 is a circuit diagram used for a two-line spot network power receiving and transforming facility, and is constructed as follows.

The lines 1C and 2C connected via the power sources 1 and 2 and the power circuit breakers 1A and 2A are connected to the primary sides of the transformers 5 and 6 via the disconnectors 3 and 4, respectively. The secondary side of the transformers 5 and 6 is connected to the common bus 1 via the circuit breakers 11 and 12.
6 is connected. Circuit breakers 13a, 13b, 13c,
The power supply side and the load side of 13d are the common bus bar 16 and the load 17.
It is connected to the. Both ends of the common circuit breaker 14 have a common bus 1
6 and the emergency generator 15.

In this power receiving and transforming facility, instrument transformers 7 and 8 are connected to the secondary sides of the transformers 5 and 6 in order to detect the voltages of the lines 1C and 2C connected to the power sources 1 and 2. The low voltage detectors 9 and 10 are connected to the secondary sides of the instrument transformers 7 and 8 to detect and monitor the low voltage of the power lines 1C and 2C.

In general, the total power failure in the power receiving and transforming equipment is judged by the power failure detecting circuit 18 by detecting whether or not the two low voltage detectors 9 and 10 operate simultaneously. For example, when carrying out maintenance and inspection work on the transformer 5 of the line 1A, in order to ensure work safety, the instrument transformer 7 from the disconnector 3 to the breaker 11 via the transformer 5 and the low voltage detector 9 are connected. At the same time as stopping the equipment in the line section including it and disconnecting it from the other healthy lines 2C and the bus, the control power supply for the lead-in line equipment for maintenance and inspection work must also be stopped.

Power is supplied to the load 17 during maintenance and inspection of the transformer 5 from the power source 2 connected to the disconnector 4 and the power source breaker 2A to the disconnector 4, the transformer 6, the circuit breaker 12, and the common circuit. Bus 16 and circuit breakers 13a, 13b, 13c, 1
Although it will be supplied via 3d, in the unlikely event of a power failure due to power loss of the power source 2, a power failure due to an accident of the service line 2C connected to the power source 2, or an accident at the power service facility, For example, when an internal accident occurs in the transformer 6, the disconnecting switch 6 and the circuit breaker 12 are opened by the protection control concept of removing the accident section from the sound line 2C. The power supply will be cut off.

When carrying out maintenance and inspection work, as described above, the control power supply for detecting a power failure must be stopped, so that the control power supply has only one power supply and the power failure detection circuit has only one circuit. In the conventional power receiving and transforming equipment, even if the above situation occurs, it is not possible to detect the total power failure of the power receiving and transforming equipment, and it is not possible to output the start command to the emergency generator.

In the power failure detection configuration according to the present invention, each line 1
A power failure detection circuit 18 is connected for each of C and 2C. The power failure detection circuit 18 has two independent control wires Pa and N
ANDs 32 and 33 are independently provided between a and Pb and Nb, and the input sides of the ANDs 32 and 33 are connected to the low voltage detectors 9 and 10 via a timer T.

According to this structure, if the outputs of the ANDs 32 and 33 are displayed on a display device such as an alarm and a CRT, it is possible to immediately detect the power failure detection in the power receiving and transforming equipment. Further, the timer T does not operate when the operation signal from the low voltage detectors 9 and 10 is instantaneous, operates when the operation signal is longer than the moment, and indicates that there is a power failure, thereby In case of so-called momentary power failure that can be automatically restored,
Since it is no longer necessary to display the fact that there is a power failure, there is no need for unnecessary maintenance work by maintenance personnel.

Details of the power failure detection circuit 18 will be described later with reference to FIG. By providing the two control power sources Pa, Na and Pb, Nb, even if the control power source of the equipment to be inspected is stopped, the control power source of the sound equipment is still active.
It became possible to detect a power failure and issue a start command to the emergency generator 15.

Therefore, even if the above-mentioned situation occurs, since the operation contacts 9a, 9b, 10a and 10b of the low voltage detectors 9 and 10 of FIG. It has become possible to detect all equipment outages and output start-up commands to emergency generator equipment. Blackout detection circuit 1
When it is determined that there is a power failure at 8, the operation command 27b for power failure detection is input to the emergency generator control device 19.

Along with this, the emergency generator control unit 19
From this, the start command 19a is output to the emergency generator 15, and the emergency generator 15 is started. Then, when it is confirmed by the emergency private generator control device 19 that the emergency generator 15 is started and the output voltage has risen to a constant voltage, the emergency generator control device 19 outputs a common conductor The closing commander 19b is output to the circuit breaker 14 and the circuit breaker 14 is closed, so that the electric power generated by the emergency generator 15 is passed through the common bus 16 to the circuit breakers 13a, 13b, 13
It is possible to supply the load 17 from c and 13d.

FIG. 2 is a diagram showing an internal circuit of the power failure detection circuit 18 in the power receiving and transforming equipment of FIG.

The control power supply 20 is divided into a control power supply 25 for the line 1C and a control power supply 26 for the line 2C by control power switches 21 and 22, respectively. Control power supply 2
The power failure detection circuit 18 of 0 connects the operating contacts 9a, 10a of the low voltage detectors 9, 10 in series to the secondary side of the control power switch 21, and the two operating contacts 9a, 10a are the operating contacts 9a,
Power failure detection relay 2 that operates only when 10a are closed at the same time
Connected to 3. Similarly, the power failure detection circuit 18 of the control power supply 26 connects the operation contacts 9b and 10b of the low voltage detectors 9 and 10 in series to the secondary side of the control power switch 22, and the two operation contacts 9b and 10b are simultaneously closed. It is connected to a power failure detection relay 24 that operates only when.

To detect a power failure, the operating contacts 23a, 24a of the power failure detecting relays 23, 24 are connected in parallel, and either one of the contacts is closed to determine the total power failure of the power receiving and transforming facility. Similarly, the operation contacts 23b and 24b can be connected in parallel and output to the emergency generator control device 19 as a start command 27b for the emergency generator 15.

FIG. 3 shows the control power supply 2 of the power failure detection circuit 18.
5 and 26 have operating contacts 9a and 10 of the low voltage detectors 9 and 10, respectively.
a is a circuit in which bypass switches 28 and 29 are provided in parallel so as to be a closed circuit during maintenance and inspection work.

Taking maintenance as an example, during maintenance of the lead-in line 1C of the power supply 1, the control power supply switch 21 is turned off, the control power supply 25 is stopped, and a power failure is detected by the control power supply 2.
6.

Here, assuming that an accident occurs in the sound line 2C during the maintenance and inspection of the line 1C and a power failure occurs, the control power supply 25 is stopped, so the operating contact 9a of the low voltage detector 9 is not closed. . On the other hand, the low voltage detector 1 on the line 2C side
The operation contact 10a of 0 closes, a current flows through the power failure detection relay 33, and the operation contact 33a of the power failure detection relay 33 closes. At this time, since the operation contact 32b is not closed, if the bypass switch 29 is manually turned on, the power failure detection relay 24 is excited and the power failure detection operation contact 24a,
24b is closed, the start command 27a for detecting all blackouts and the start command 27b for the emergency generator are output, and the emergency generator control device 19 is operated.

In addition, when the line 2C is opened and maintenance work is performed, the power failure detection relays 32 and 23 operate in the opposite manner to the above. The operation contact 32a is closed and the operation contact 33b is not closed, but when the bypass switch 28 is manually turned on, the power failure detection relay 23 is excited.

In this way, the operating contact 10 of the maintenance and inspection equipment
By short-circuiting a and 9b with the bypass switches 28 and 29, the detection of the power failure is detected by the low voltage detectors 9 and 10 of the sound equipment.
It is possible to detect the total power outage of only the sound equipment and at the same time detect the total power outage of the power receiving and transforming equipment easily. Then, when the power receiving and transforming facility is completely out of power, the total outage detection 27a and the emergency generator start-up command 27b are output, and the power outage of the load side circuit breakers 13a to 13d can be prevented.

In the above description, the bypass switches 28 and 29 are manually operated in order to bypass the operating contacts 9b and 10a of the low voltage detectors 9 and 10. However, in the power failure detection circuit 18 shown in FIG. The control power supply detection relays 30 and 31 interlocking with the presence or absence of the control power supply voltage are provided, the automatic contacts 30a and 31a that perform the same operation according to the operation of the control power supply detection relays 30 and 31 are provided, and the operation contacts 9b and 10a are short-circuited, respectively. To connect.

In this way, the control power supply detection relays 30 and 31
By connecting, the bypass circuit works in tandem with the presence or absence of the control power supply, and it is possible to avoid the malfunction of the total power failure detection circuit due to forgetting the operation during maintenance and inspection work.

[0031]

As described above, according to the present invention, in the power lead-in line equipment of the power receiving and transforming equipment, the healthy line equipment is not stopped even during the maintenance and inspection work. Even when it occurs, it is possible to detect the total power failure of the power receiving and transforming equipment, and to issue a start command to the emergency generator and a power supply command to the load.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a power failure detection circuit of a power receiving and transforming facility shown as an embodiment of the present invention.

FIG. 2 is a circuit diagram of a power failure detection circuit of a power receiving and transforming facility shown as another embodiment of the present invention.

FIG. 3 is a circuit diagram of a power failure detection circuit of the power receiving and transforming facility shown as another embodiment of the present invention.

FIG. 4 is a circuit diagram of a power failure detection circuit of a power receiving and transforming facility shown as another embodiment of the present invention.

[Explanation of symbols]

1, 2 ... power supply, 3, 4 ... disconnecting switch, 5, 6 ... transformer, 7,
8 ... Transformer for instrument, 9, 10 ... Low voltage detector, 9a, 9
b, 10a, 10b ... Operating contact, 11, 12 ... Circuit breaker,
13a, 13b, 13c, 13d, 14 ... Circuit breaker, 15
... Emergency generator, 16 ... Common busbar, 17 ... Load, 18 ...
Blackout detection circuit, 19 ... Emergency generator control device, 19a ...
Start command, 19b ... Make command, 20 ... Control power supply 21,
22 ... Control power switch, 23, 24 ... Power failure detection relay, 27a, 27b ... Start command, 28, 29 ... Bypass switch, 30, 31 ... Control power detection relay, 30a,
31a ... Automatic contact, 32, 33 ... Power failure detection relay, 32
a, 32b, 33a, 33b ... Operating contact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuo Kano, 1-1 Kokubun-cho, Hitachi City, Ibaraki Prefecture 1-1 Kokubun Plant, Hitachi, Ltd. (72) Kazuo Kurita 1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 inside the Kokubun Plant of Hitachi, Ltd.

Claims (6)

[Claims] 1. A measuring instrument transformer for connecting a plurality of lines provided with a disconnecting portion, a transformer, and a circuit breaker between a power bus and a common conductor, and detecting a line fault for each of the plurality of lines. The low voltage detector connected to the secondary side of the transformer for
In a power receiving and transforming facility that displays a power failure on a display means, an AND circuit that independently outputs an operation signal of a low-voltage detector of one side line and an operation signal of a low-voltage detector of the other side line is independently controlled. A power failure detection control circuit for power receiving and transforming equipment, which is connected to a power supply and displays a power failure by an output signal from each AND circuit. 2. A timer is provided between the low voltage detector and the AND circuit, the timer being activated when the operation signal of the low voltage detector is flowing for a time longer than the moment.
Power failure detection control circuit for the receiving and transforming equipment described. 3. When the output signal from the AND circuit is input, the generator control device issues a start command to the emergency generator and a common conductor breaker connected to the common conductor to close. The power failure detection control circuit of the power receiving and transforming facility according to claim 1. 4. An operating contact that operates when the low-voltage detector operates, a non-operating operating contact, and a stop voltage relay that is excited by the operation of the operating contact are connected between the plurality of independent control power sources, and 4. The power failure prevention control circuit for power receiving and transforming equipment according to claim 1, wherein the operating contact operates in a circuit of a stop voltage relay side that is excited. 5. An operation contact that operates when the low voltage detector connected between the plurality of independent control power supplies operates, a stop voltage relay that is excited by the operation of the operation contact, and an operation that closes when the stop voltage relay is excited. A contact and an operating contact to be opened are provided in the excitation side power failure relay circuit and the non-excitation side power failure relay circuit, and the bypass switches provided in both power failure relay circuits are closed by the excitation side power failure relay circuit. A power failure prevention control circuit for power receiving and transforming equipment according to any one of 1 to 3. 6. An operation contact that operates when the low voltage detector connected between the plurality of independent control power supplies operates, a stop voltage relay that is excited by the operation of the operation contact, and an operation that closes when the stop voltage relay is excited. Provide a contact and an open operation contact in the excitation side power failure relay circuit and non-excitation side power failure relay circuit, and provide a control power supply detection relay with an automatic contact point that automatically closes when both of the power failure relay circuits operate when the stop voltage relay operates. A power failure prevention control circuit for power receiving and transforming equipment according to any one of claims 1 to 3.