JPH0622459A - Monitor control board with display unit - Google Patents

Abstract

PURPOSE:To prevent an overload operation by providing a load breaker for selecting a load to be cut-off and a selecting and cutting-off state display lamp of a load to be disconnected at the time of separating a system if a non-utility generator facility is separated from an electric power company. CONSTITUTION:Power is received from an electric power company system 1 by a power receiving breaker 4, and a non-utility generator facility 2 is connected to a power distribution bus 18 via a generator breaker 16. Protective loads 11 and 12 are connected to breakers 7, 8, and selectively breaking loads 13, 14 are connected to breakers 9, 10. The breaker of a selectively cut-off state lights a selectively cut-off state display lamp 21, and the breaker of a trip blocking state lights-off a selectively breaking display lamp 22. An operating state is confirmed by a monitoring instrument 30. Thus, a selective breaking circuit is formed of a trip block switch. When the number of circuits is increased, an operator can judge the lamp, and hence an overload prevention of the facility can be effectively decided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a condition monitoring of a distribution line in a premises having a private power generation facility which is connected to an electric power system of a power company and always operates in parallel. The present invention relates to a supervisory control panel with a display capable of displaying a selective disconnection state display for displaying a distribution line circuit breaker performing a breaking operation or a generated power of a private power generation facility and a consumed power thereof as a load when a system separation operation occurs.

[0002]

2. Description of the Related Art Conventionally, when there is a private power generation system that is always connected in parallel with the power system of the power company, it is separated from the power company system to prevent overload operation of the private power generation system and the private power generation system is used. When the equipment is in the independent operation state, prepare a device that outputs a selective cutoff command to the disconnected load, which is linked with the cutoff command to the receiving point circuit breaker to limit the load below the generated power. ing.

However, some private power generation facilities are easily affected by the ambient temperature and their output decreases when the temperature becomes high. Generally, the amount of generated power varies depending on the season. For this reason, the driver actually adjusts each time so that only the safety load and other necessary loads commensurate with the generated power are left. That is, the breaking line of the distribution line breaker is changed. This operation uses the trip lock switch for the selective cutoff command, the trip line is closed and the trip lock switch is accepted as it is, and the trip lock circuit operates the trip lock switch to block the selective cutoff command. ing.

The generated electric power is collated, and the total load electric power to be remained is calculated and compared. At this time, unless the operator remembers which load is the load to be selectively cut off, there is a risk of making an error because it is not displayed on the monitor control panel surface.

[0005]

When the private power generation facility bears a load more than the generated power, the engine side becomes overloaded,
Measures are taken to increase the amount of combustion, but if it exceeds the limit value, it will overheat or the rotation speed will decrease. Further, the generator side also detects an overload state, but the withstand capacity is large on the generator side and severe on the engine side. This decrease in rotation speed is also detected on the electric circuit side as a decrease in frequency. As a result, in order to continue the operation of the private power generation equipment, it is the actual situation that either the temperature rise value limit or the frequency fall protection is operating effectively. However, since temperature detection continues to stop the engine, protection is provided before that. If the frequency is lowered, the performance of the product is also lowered and defective products are likely to be generated. From this point as well, it is necessary to protect the private power generation equipment from overload.

As a measure against this overload, there is a selective load device which cuts off an appropriate amount of load when the interconnection with the power company system is cut off. In a system in which the number of cutoff lines is adjusted by a trip lock switch, it is necessary to be able to monitor which line is currently selected for cutoff.

[0007] Since the operator keeps a record of the power meter side for the diary at every fixed time, the total of the generated power of the private power generation equipment and the power of the load line connected to the private power generation equipment system at the time of grid separation is totaled. This makes it easy to judge whether the load will be overloaded or less than the generated power at the time of separation.
You don't have to rely on your memory.

This will be described below with reference to the drawings. FIG. 1 is a single line diagram showing an electric power system, in which a power receiving circuit breaker 4 of a customer receives power from a power company system 1 via a power transmission line 15. From there, it transforms into a distribution voltage via the transformer 3 via the bus 16 in the customer premises, and is connected to the distribution bus 18 via the transformer secondary breaker 5 via the transformer secondary bus 17. This power distribution bus is connected from the private power generation equipment 2 via the connection line 19 by the generator breaker 6. Security load 11
And and 12 are connected to a security load 1 circuit breaker 7 and a security load 2 circuit breaker 8 via a distribution line 20. On the other hand, the selective breaking loads 13 and 14 pass through the distribution line 20 and the selective load 1 circuit breaker 1
3, the selected load 2 is connected to the circuit breaker 14.

In this state, the operator operates the operation switch 25, the red signal lamp 23 for indicating the closed state and the green signal lamp 2 for indicating the open state, which are mounted on the monitor control panel 35 shown in FIG.
4, circuit display card plate 26, transformer symbol 2
7. The system configuration and the operating state are confirmed by the private power generation equipment symbol 28, the simulated bus bar 29, and the monitoring instrument 30.

The operation control circuit in this state is constructed as shown in FIG. 7, and the operation of the breakers 7, 8, 9, 10 for the safety loads 1 and 2 of the distribution line and the selective breaking loads 1 and 2 is carried out. Each circuit breaker is turned on or off by turning on or off the switch 25. On the other hand, the circuit breaker in the closed circuit receives the circuit break command from the protective relay 32 provided for each circuit. Further, the trip lock switch 31 can accept an operation by the selective shut-off command 33 that is instructed at the time of system separation, or can block the operation to put it in a trip lock state. While the circuit breaker is closed, the red signal light 23 is turned on, the green signal light 24 is turned on, and the red signal light 23 is turned off. During the open circuit, the green signal light 24 is on and the red signal light 23 is off.

Thus, with the trip lock switch,
Although a selective cutoff circuit is configured or a blocked state is created, when the number of circuits is large, there is a drawback that the operator cannot remember and may be confused. In the above-mentioned device, it is difficult to maintain and monitor the continuous operation load and to change the operation of the power generation facility 2 for private use below the power generated by the private power generation facility 2. An object of the present invention is to provide a supervisory control panel with an indicator that can prevent overload operation when a private power generation facility is separated from a power company system.

[0012]

In order to achieve the above object, the invention according to claim 1 is connected to a power system of an electric power company to constantly operate a private power generation facility in parallel to provide a safety load and a non-security load. In the supervisory control panel that can supply power and monitor the status,

The power generation system for private use is installed at the interconnection point between the power system and the private power generation facility, and when the short-circuit accident or the ground fault in the power system or the power transmission on the power company side is stopped, the power generation system for private use In the case of a state of reverse power transmission to the grid side, a protection operation, a receiving point circuit breaker that separates the power grid and the private power generation equipment grid,

The power generation system for private use and the non-safety load are connected to each other and the power generation system for private use and the safety load are connected to each other. At this time, among the loads, a safety load borne below the power generated by the private power generation facility and a non-safety load that can be covered are left, and a load circuit breaker that selectively cuts off the other loads to be disconnected, and on the monitoring control panel. The present invention is provided with a selective shut-off state indicator that is installed and is loaded when the system is separated.

In order to achieve the above-mentioned object, the invention according to claim 2 is that the power generation equipment for private use is constantly operated in parallel by being connected to the electric power system of the electric power company to supply electric power to the safety load and the non-security load, respectively. In the control panel that can monitor the status,

[0016] The power generation system for private use is installed at the interconnection point between the power system and the private power generation facility, and power is supplied from the private power generation facility side when a short-circuit accident or a ground fault in the power system or power transmission on the power company side is stopped. In the case of a state of reverse power transmission to the grid side, a protection operation, a receiving point circuit breaker that separates the power grid and the private power generation equipment grid,

The power generating system for private use and the non-safety load are connected to each other and the power generating system for private use and the safety load are connected to each other. At this time, a load circuit breaker which, among the loads, leaves a safety load and a non-safety load that can be covered by the generated power of the private power generation facility or less, and selects and disconnects other loads to be disconnected,

The power generation / load installed on the supervisory control panel, which aggregates the measured power values obtained by regularly measuring the power consumption of the load on the private power generation facility at the time of the grid separation, and displays the aggregated value. And a power consumption indicator.

[0019]

According to the invention according to claim 1, since the operator regularly measures, the record of the generated power of the private power generation equipment and the total power consumption of the safety distribution line load which becomes the trip lock can be compared. It will be easier and there will be very few miscalculations. Therefore, it is possible to monitor the operation of the private power generation facility, which is operated independently when the system is separated from the power company, so as not to be overloaded.

According to the invention according to claim 2, since the operator regularly measures, the generated power of the private power generation facility and the total power consumption of the safety distribution line load which becomes the trip lock are displayed in contrast. It is possible to easily and easily monitor the operation of the private power generation facility, which operates independently when the system is separated from the power company, so as not to overload.

[0021]

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

The power system diagram is the same as the conventional example of FIG. 1 described above. The power receiving company breaker of the customer is supplied from the power company system 1 of the first embodiment of the monitor control board with display of the present invention through the power transmission line 15. Four
To receive power. From there, it passes through the busbar 16 in the customer's premises, transforms into a distribution voltage via the transformer 3, and is connected to the distribution busbar 18 via the transformer secondary cutoff 5 by the transformer secondary busbar 17. This power distribution bus is connected from the private power generation equipment 2 via a connection line 19 by a generator breaker 16. Security load 1
1 and 12 are the safety load 1 circuit breaker 7 via the distribution line 20,
The safety load 2 is connected to the circuit breaker 8. On the other hand, the selective load 1 circuit breaker 13, 14 via the distribution line 20
It is connected to the selective load 2 circuit breaker 14.

In this state, the operator operates the operation switch 25, the red signal lamp 23 for indicating the closed state and the green signal lamp 24 for indicating the open state, which are mounted on the monitoring control panel 34 with the selective shut-off state indicating lamp shown in FIG. Circuit display card plate 26,
The transformer symbol 27, the private power generation equipment symbol 28, the simulated busbar 29, the monitoring instrument 30, and the simulated busbar 34 confirm the system configuration and the operating state.

FIG. 2 shows that the circuit breaker of the distribution line is provided with a selective cutoff indicator light on the panel surface of the supervisory control panel 34 with the selective shutoff state indicator light according to the present invention. The indicator light 21 is turned on, and the circuit breaker in the trip lock state is turned off by the selective shut-off state indicator lamp 22. Further, in the circuit breaker operating switch 25, the red signal 23 is turned on and the green signal lamp 24 is turned off for the circuit breaker in the closed circuit. When the circuit breaker is open, the green signal light is on and the red signal light is off. Other than the above, similar to the conventional monitor and control panel, the system configuration and the operating state are confirmed by the card plate 26 with the name and the like, the transformer symbol 27, the private power generation equipment symbol 28, the simulated busbar 29, and the monitoring instrument 30. .

FIG. 3 is a diagram of this operation control circuit. The trip lock switch 31 has two normally open contacts 31a1 and 31.
a2, the contact 31a1 is used for the selective shutoff command circuit 33, is used for accepting the shutoff command and for the trip lock state configuration, and the remaining contact 31a2 is used for the circuit of the selective shutoff state indicator lamp 21. The selection state display light 21 is turned on while the selection cutoff is selected, and the selection cutoff state indicator light extinguishing 21 is turned off when the trip lock is set.

Thus, the security loads 1 and 2 of the distribution line are
As for the operation of the circuit breakers 7, 8, 9 and 10 for the selective breaking loads 1 and 2, each of the circuit breakers 7 to 10 is turned on or turned off by turning on or off the operation switch 25. On the other hand, the circuit breaker in the closed circuit receives the circuit break command from the protective relay 32 for each circuit. or,
The trip lock switch 31 accepts the operation by the selective cutoff command circuit 33 commanded at the time of system separation,
Can be blocked and trip-locked. While the circuit breakers 7 to 10 are closed, the red signal light 23 is turned on, the green signal light 24 is turned on, and the red signal light is turned off. During the open circuit, the green traffic light 24 lights up and the red traffic light 23
Is off.

In this way, with the trip lock switch,
Although a selective shutoff circuit is configured or a blocked state is created, when the number of circuits increases, the operator can judge by checking whether the indicator light is on or off, so it is possible to reliably prevent overload of the private power generation equipment. Can be judged.

According to the first embodiment of the present invention described above, it is possible to easily compare the total power value of the meter indicating the generated power of the private power generation facility and the meter indicating the power of the selective cutoff state extinguishing circuit. Since the size can be easily discriminated, it is possible to prevent overload operation when the private power generation facility is separated from the power company system.

Next, a second embodiment of the present invention will be described with reference to FIG.
And it demonstrates with reference to FIG. FIG. 4 is a diagram showing a monitoring control board, which is different from the first embodiment described above in the following points. That is, the digital power indicator 34 and the power numerical value input device 35 are provided so that the power consumption, which becomes a load with the generated power of the private power generation facility when the system separation occurs, can be displayed.

The digital power indicator 34 and the power numerical value input device 35 are constructed as shown in FIG.
Input the total value of both the load power consumption and the generated power of the operator's power generation equipment, which is being measured to record the power meter side for the diary at regular time, in 5 and input with the power value input device 35. The value is displayed on the digital power display 34, and at the same time, the generated power is displayed.

Since the second embodiment is configured in this way, the digital power indicator 34 displays the total value of the generated power of the private power generation equipment and the power consumption that becomes the load of the private power generation equipment at the time of grid separation at regular time intervals. Since the value is updated and displayed in a measurement manner, the operator can prevent the overload operation by constantly monitoring the value when the private power generation facility is separated from the power company system. As a result, it is possible to prevent the power generation equipment for private use from dropping off or a power failure accident. The other effects are obtained in the same manner as in the first embodiment described above.

[0032]

According to the present invention described above, it is possible to provide a monitor control panel with a display which can prevent an overload operation when a private power generation facility is separated from a power company system.

[Brief description of drawings]

FIG. 1 is a single-line system diagram of an electric power system that is an object of the present invention.

FIG. 2 is a diagram showing a first embodiment of a supervisory control panel with a display according to the present invention.

FIG. 3 is a diagram for explaining the operation control circuit of FIG.

FIG. 4 is a diagram showing a second embodiment of the supervisory control panel with a display according to the present invention.

FIG. 5 is a diagram for explaining the electric power numerical value input device and the display device of FIG. 4;

FIG. 6 is a diagram showing an example of a conventional monitoring control board.

FIG. 7 is a diagram for explaining a problem of the operation control circuit of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric power system of a power company, 2 ... Private power generation equipment, 3 ... Transformer, 4 ... Power receiving circuit breaker, 5 ... Transformer secondary circuit breaker, 6 ... Generator circuit breaker, 7 ... Security load 1 circuit breaker, 8 ... Security load 2 circuit breaker, 9 ... Selective break load 1 circuit breaker, 10 ... Selective break load 2 circuit breaker, 11 ... Security load 1, 12 ... Security load 2, 13
... selective breaking load 1,14 ... selective breaking load 2,15 ... transmission line, 16 ... bus in customer premises, 17 ... secondary transformer bus,
18 ... Distribution busbars, 19 ... Communication lines, 20 ... Distribution lines, 21 ...
Selective shut-off state lighting indicator, 22 ... Selective shut-off state indicator, 23 ... Red signal light, 24 ... Green signal light, 25 ... Operation switch, 26 ... Card plate, 27 ... Transformer symbol, 28 ... Private power generation equipment symbol, 29 … Simulated bus,
30 ... Monitoring instrument, 31 ... Trip lock switch, 32
... Protective relay, 33 ... Selective interruption command circuit, 34 ... Digital power indicator, 35 ... Electric power value input device, 36 ... Monitor control panel with selective interruption status indicator lamp of the present invention, 37 ... Conventional supervisory control board.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI Technical indication location H02J 3/00 A 7509-5G H02P 9/00 B 2116-5H (72) Inventor Akito Watanabe Tokyo 1-1-1 Shibaura, Minato-ku, Tokyo Inside Toshiba Head Office

Claims (2)

[Claims] 1. A monitoring control panel capable of continuously operating private power generation equipment in parallel by connecting to an electric power system of an electric power company to supply electric power to each of a safety load and a non-safety load, and monitoring a state of the electric power system. And is arranged at the interconnection point with the private power generation equipment,
In the case of a short-circuit accident or a ground fault in the power system, or in the case of reverse power transmission from the private power generation facility side to the power system side when power transmission on the power company side is stopped, a protective operation is performed, and A power receiving point circuit breaker that separates the power system and the private power generation system from each other, and is provided between the private power generation system and the connection point of the non-security load and between the private power generation system and the connection point of the security load, respectively. , When the system is separated by the operation of the power receiving point breaker, select a load to be separated from the loads, leaving a safety load and a non-security load that can be covered below the generated power of the private power generation facility. A monitor and control panel with a display, comprising: a load circuit breaker for shutting off the load by means of a load; and a selective shut-off state indicator which is installed on the monitor and control panel and is disconnected when the system is separated. 2. A monitoring and control panel capable of operating a private power generation facility in parallel at all times in parallel with an electric power system of an electric power company to supply electric power to a safety load and a non-safety load and monitoring the state of the electric power system. And is arranged at the interconnection point with the private power generation equipment,
In the case of a short-circuit accident or a ground fault in the power system, or in the case of reverse power transmission from the private power generation facility side to the power system side when power transmission on the power company side is stopped, a protective operation is performed, and A power receiving point circuit breaker that separates the power system and the private power generation system from each other, and is provided between the private power generation system and the connection point of the non-security load and between the private power generation system and the connection point of the security load, respectively. , When the system is separated by the operation of the power receiving point breaker, select a load to be separated from the loads, leaving a safety load and a non-security load that can be covered below the generated power of the private power generation facility. And a load circuit breaker that cuts off the power, which is installed on the monitoring and control panel and aggregates the power measurement values obtained by regularly measuring the power consumption of the load of the private power generation facility when the grid is separated, Shimesuru generated power, load power indicator and a display unit with monitor control panel provided with the.