JPH02232701A - Power failure control system for facility monitor and control equipment - Google Patents

Abstract

PURPOSE:To automatically turn on the power source of an equipment stopped at the time of the occurrence of momentary power failure by monitoring operations of two under voltage relays to execute the overall power failure processing for decision of overall power failure and the momentary power failure processing for decision of momentary power failure. CONSTITUTION:A power receiving and transforming equipment 20 of a building or a plant as the monitor and control object is controlled against power failure by an information processor. Execution of a power failure control program is started by the operation of a high-speed under voltage relay 23 connected to a bus 22. After the start, the operation of a low-speed under voltage relay 24 is referred to in order to decide whether overall power failure or a momentary power failure occurs. When the under voltage state is continued for a time longer than the operation time limit settling time of the relay 24, this relay 24 is operated to decide the occurrence of overall power failure. The relay 24 is not operated for power failure of about several 10msec, and the occurrence of momentary power failure is decided. When overall power failure is decided, the overall power failure processing is executed. When momentary power failure is decided, the momentary power failure processing is executed and the power source of the facility stopped by momentary power failure is automatically turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an equipment monitoring and control device that monitors and controls incidental equipment in buildings and factories, and particularly relates to a power outage control method in the equipment monitoring and control device. [Prior Art] Conventionally, in the power outage control method of this type of equipment monitoring and control equipment, power outage detection is based on the operating state of one undervoltage relay installed on the busbar of the power receiving and transforming equipment for local control of the power receiving and transforming equipment. Is going. [Problems to be Solved by the Invention] Power outage detection in the power outage control method of the conventional equipment monitoring device described above is based on one undervoltage relay installed on the busbar of the substation @ equipment for local control of the substation equipment. This is done depending on the operating condition. This undervoltage relay has a set operating time of several seconds to ensure stable operation of the power receiving and substation equipment. For this reason, instantaneous power outages of several milliseconds to several tens of milliseconds cannot be detected, and when a momentary power outage occurs, equipment that has stopped due to the instantaneous power outage must be restarted manually. An object of the present invention is to provide a power outage control method for equipment monitoring and control equipment that solves the above problems. [Means for Solving the Problems] In order to achieve the above object, the present invention provides a power outage control system for a facility monitoring and control device that monitors and controls incidental equipment such as power receiving and transforming equipment, air conditioners, etc. of buildings and factories. Two undervoltage relays with different operating time settings are installed on the busbar of the substation equipment, and a power outage detection system that monitors the operation of the two undervoltage relays and determines whether a power outage that occurs is a main power outage or a momentary power outage based on the operating status. A main power outage processing section is executed when a main power outage is determined, and an instantaneous power outage processing section is executed when an instantaneous power outage is determined.

〔Example〕

Next, the present invention will be explained with reference to the drawings. Figure 1 is a configuration diagram of the equipment monitoring and control device. The equipment monitoring and control device 1 includes an information processing device 2, an interface device ff3, and a display device I! 4. The building and factory auxiliary equipment 6, which are the objects of monitoring and control, are connected to the information processing system through the interface device 3, which is composed of the recording device 5! Connected to 12. Figure 2 is a configuration diagram of the power receiving and transforming equipment. The power receiving and transforming equipment 20 receives commercial power with a transformer 21, converts it to a specified voltage, and shuts it off at Wh25. Load 2 through 27
A high-speed undervoltage relay 23 whose operating time limit is set to approximately several milliseconds to several tens of milliseconds and a low-speed undervoltage relay 24 whose operating time limit is set to approximately several seconds are installed on the bus bar 22 that supplies power to the bus 9. ing. In addition, in order to be able to supply power to emergency loads and important loads even in the event of a power outage, a circuit breaker 26. A generator 30 is connected via the circuit breaker 25. 27 is always on, and the circuit breaker 26. 28 is always disconnected, and 5 always supplies power to the load 29 from the commercial power source.

FIG. 3 is a functional configuration diagram of a power outage control program executed in the information processing device 2. As shown in FIG. Power outage control program 40
A power outage detection unit 41 that monitors the operation of two undervoltage relays and determines whether a power outage that has occurred is a main power outage or a momentary power outage based on the operating state; a main power outage processing unit 42 that is executed when a main power outage is determined; FIG. 4 is a flowchart of a power outage control program executed in the information processing device 2. Execution of the power outage control program 40 is started by the operation of the high-speed undervoltage relay 23 (lot). After starting, wait for at least the operating time limit of the low-speed undervoltage relay 24 (step 102). Referring to the operating state of the low-speed undervoltage relay 24, it is determined whether a main power outage or a momentary power outage has occurred (step 103). If the undervoltage state continues for a period longer than the operating time setting value of the low speed undervoltage relay 24, the low speed undervoltage relay 24 will operate and it will be determined that a main power outage has occurred. In a power outage of several tens of seconds to several tens of milliseconds, it is sufficiently shorter than the time-limited setting value of several seconds of the low-speed undervoltage relay 24, so the low-speed undervoltage relay 24 does not operate and is determined to be an instantaneous power outage. If it is determined as a main power outage in the above judgment, the specified main power outage processing is performed (step 104). If it is determined that there is an instantaneous power outage, instantaneous power outage processing is performed (step 105). Momentary power outage processing automatically turns on equipment that has stopped due to a momentary power outage. [Effects of the Invention] As explained above, the present invention provides a power outage control method for equipment monitoring and control equipment in which the operation time limit for the busbar of variable equipment is set to several seconds and several 1+9 to several 10.
By installing two undervoltage relays and monitoring the operating status of the two undervoltage relays, it is possible to detect momentary power outages, and when a momentary power outage occurs, equipment that has stopped due to a momentary power outage can be automatically turned on. be.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the equipment monitoring and control device according to the present invention, Fig. 2 is a block diagram of the power receiving and transforming equipment, Fig. 3 is a functional block diagram of the power outage control program, and Fig. 4 is a flow diagram of the power outage control program. . 1... Equipment monitoring system 1il device 2... Information processing device 3... Interface device 4... Display device 5... Recording device 6...
Building, factory auxiliary equipment 20...Power receiving and transforming equipment 21...Transformer 22
... Bus bar 23 ... High speed undervoltage relay 24 ... Low speed undervoltage relay 25, 26.27, 2δ ... Breaker 29 ... Load 30 ... Generator 40 ... Power outage control program 41... Power outage detection section 42... Main power outage processing section 43... Momentary power outage processing section

Claims (1)

[Claims] (1) In the power outage control method of equipment monitoring and control equipment that monitors and controls incidental equipment such as power receiving and transforming equipment and air conditioning equipment in buildings and factories, there are two deficiencies in the operating time limit settings installed on the busbars of power receiving and transforming equipment. A power outage detection unit that monitors the operation of the voltage relay and the two undervoltage relays and determines whether a power outage that has occurred is a main power outage or an instantaneous power outage based on the operating state; a main power outage processing unit that is executed when a main power outage is determined; 1. A power outage control method in an equipment monitoring and control device, comprising an instantaneous power outage processing unit that is executed when a power outage is determined.