JP2006217728A - Power facility and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the control of a power facility which supplies power from a private generator. <P>SOLUTION: This power facility is equipped with a connection breaker 5 which is connected between a receiving/distributing facility 3 and a private generation facility 6, and voltage detectors 7 and 8 which are connected to the side of the above private generation facility 6 of the above connection breaker 5 and also outputs a signal for opening the above connection breaker 5. Since the connection breaker 5 is closed by the signal from the voltage detectors 7 and 8, the control between the receiving/distributing facility 3 and the private generation facility 6 becomes simple, and the inspection and repair of the private generation facility 6 can be facilitated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power supply facility connected to a private power generation facility and a control method thereof.

  Generally, in-house power generation equipment is installed in the power distribution equipment of facilities such as large buildings as an emergency power outage countermeasure. This is to supply power to equipment (computers, communication equipment, emergency elevators, etc.) that are inevitably necessary to maintain the function in the event of a power failure depending on the use of the facility.

Conventionally, when power is supplied to a power receiving and distribution facility during a power failure, the following technique is known (for example, see Patent Document 1). A communication breaker connected to the power distribution facility after starting an emergency generator such as a diesel generator in a private power generation facility at the time of a power failure and confirming that the voltage has risen (for example, 90% or more of the rated voltage) Is closed. As a result, the power distribution facility is charged, and the function of the equipment is maintained even during a power failure.
Japanese Patent Laid-Open No. 7-132000 (second page, FIG. 1)

  The above conventional power supply equipment has the following problems.

  A large number of control lines for detecting the rise of the voltage of the diesel generator and controlling the switching of the circuit breaker are connected between the private power generation facility having a diesel generator and the power distribution facility. For this reason, when inspecting and refurbishing private power generation facilities, a large number of control lines are connected to the power distribution facilities as well, so it was necessary to inspect and renovate not only private power generation facilities but also power distribution facilities. .

  In particular, when an existing private power generation facility is removed and a temporary one is connected, in addition to switching control between the existing and temporary installations, it is necessary to switch control on the power distribution and distribution facility side, which is difficult and difficult to perform. It took time. If this control switching is not performed reliably, the private power generation facility cannot be controlled.

  For this reason, there has been a demand for a power supply facility that simplifies the control between the power distribution facility and the private power generation facility and that can be easily inspected and repaired in a short time.

  The present invention has been made to solve the above problems, and an object thereof is to provide a power supply facility that can easily control power supply.

  In order to achieve the above-mentioned object, the communication circuit breaker connected between the power distribution facility and the private power generation facility is connected to the private power generation facility side of the communication breaker, and the communication breaker is opened. And a voltage detection device that outputs a signal.

  According to the present invention, the output voltage of the private power generation facility is detected by the voltage detection device, and when the voltage reaches a predetermined value, the communication circuit breaker is closed by a signal from the voltage detection device. Control between private power generation facilities is simplified, and inspection and repair of private power generation facilities can be facilitated.

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

  A power supply facility according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a single-line diagram showing a configuration of a power supply facility according to an embodiment of the present invention.

  As shown in FIG. 1, a power supply facility such as a building is supplied with power from, for example, a power receiving unit 1a that receives power from an electric power company, a private power generation facility 1b that generates power in an emergency, a power receiving unit 1a, and a private power generation facility 1b. It is comprised with the load part 1c which receives.

  The power receiving unit 1a is provided with a power receiving / distributing facility 3 having a power receiving circuit breaker 2, and is connected to, for example, a commercial frequency power source 4 of an electric power company to perform normal power reception. Moreover, the normally open circuit breaker 5 which opens and closes the electric power from the private power generation equipment part 1b mentioned later is provided. A primary side of the instrument transformer 7 is connected to the communication breaker 5, and a voltage relay 8 that operates at a predetermined voltage is connected to the secondary side. The voltage relay 8 can control the opening and closing of the communication breaker 5.

  The private power generation equipment 1b is provided with an emergency generator 6 such as a diesel generator or a gas turbine generator.

  The load section 1 c is provided with a common bus 9 and is connected to the secondary side of the power receiving circuit breaker 2 and the communication circuit breaker 5. The common bus 9 is connected to a load-side circuit breaker 10 that supplies power to a plurality of loads. The load side of the load-side circuit breaker 10 is connected to equipment that is absolutely necessary to maintain its function during a power failure.

  Here, the emergency power supply facility that immediately generates power in the event of a power failure and supplies power to the load side includes an emergency generator 6, an instrument transformer 7, a voltage relay 8, an emergency circuit breaker 5, and a common bus 9. Is done.

  Next, the operation of the emergency power supply facility will be described.

  When the voltage of the commercial frequency power supply 4 is reduced or lost, an undervoltage relay (not shown) in the power distribution facility 3 operates, and the power receiving circuit breaker 2 is opened. Then, the emergency generator 6 starts operation immediately. In this case, the communication circuit breaker 5 is in an open circuit state.

  When the emergency generator 6 that has started operation approaches a steady state and the voltage rises, the voltage is detected by the instrument transformer 7 (voltage detection means), and the voltage relay 8 is activated and the communication breaker is operated. 5 is closed (communication circuit breaker closing means). If the communication breaker 5 is closed, the common bus 9 is charged and power can be supplied to the load side.

  Here, if the voltage relay 8 is set to operate at a predetermined value of 90% or more of the rated voltage, for example, the common bus 9 can be charged with a stable voltage. In addition, when the emergency generator 6 starts operation and reaches a predetermined value, it is a condition for closing the communication breaker 5.

  In the voltage detection means, a voltage divider such as a capacitor-type voltage divider may be used, and in the communication circuit breaker closing means, the voltage detected from the voltage divider is amplified to connect the communication circuit breaker 5. A device that outputs a signal for closing may be used.

  What detects the rising of the voltage of these emergency generators 6 and outputs a signal for closing the communication breaker 5 at a predetermined voltage is defined herein as a voltage detection device.

  As a result, even if the voltage of the commercial frequency power supply 4 drops or is lost, when the emergency generator 6 immediately starts operation and rises to a predetermined voltage, a signal is sent from the voltage detection device. The circuit breaker 5 is closed, and stable power can be supplied to the load side. Moreover, since the voltage detector detects the rising of the voltage of the emergency generator 6, the control between the power receiving / distributing equipment 3 and the private power generating equipment section 1b is simplified. In particular, in order to inspect and repair the existing private power generation equipment section 1b, when a temporary one is provided, it is not necessary to switch the control signal line of the circuit breaker 5 and the switching work is facilitated.

  When the commercial frequency power supply 4 recovers, the communication circuit breaker 5 is opened and the power receiving circuit breaker 2 is closed.

  According to the power supply facility of the above embodiment, the voltage detector detects the rise of the voltage of the emergency generator 6, and when the predetermined voltage is reached, the communication breaker 5 is closed. Control between the power receiving and distribution equipment 3 is simplified, and inspection and repair can be facilitated.

The single wire connection figure which shows the structure of the power supply equipment which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Electric power receiving part 1b Private power generation equipment part 1c Load part 2 Power receiving circuit breaker 3 Power receiving / distributing equipment 4 Commercial frequency power supply 5 Connection circuit breaker 6 Emergency generator 7 Instrument transformer 8 Voltage relay 9 Common bus 10 Load side circuit breaker

Claims (3)

A communication breaker connected between the power distribution facility and the private power generation facility;
A power supply facility comprising: a voltage detection device that is connected to the private power generation facility side of the communication breaker and outputs a signal for opening the communication breaker.   The power supply facility according to claim 1, wherein the voltage detection device includes an instrument transformer and a voltage relay. Voltage detection means for detecting the voltage on the private power generation facility side of the communication breaker;
A control method for power supply equipment, comprising: a communication breaker closing means for closing the communication breaker and supplying power to the power receiving and distribution equipment when the voltage detected by the voltage detection means reaches a predetermined value.

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