JPH0260430A - Output controller of generator - Google Patents

Abstract

PURPOSE:To improve the reliability by transmitting a fault signal when a load is not born evenly by AC generators being operated in parallel. CONSTITUTION:When the difference between outputs from AC generators 2A, 2B being operated in parallel exceeds over a predetermined range and such a state continues for a predetermined time, a judging unit 12 judges that a load bearing unit 5 is not operating normally and provides a fault signal. Consequently, a fault display lamp 13 lights and a fault buzzer 14 sounds.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an output control device for a power plant equipped with a plurality of alternating current generators.

[Conventional technology]

FIG. 3 shows a conventional generator output control device described in Utility Model Application No. 60-38041. In the figure, IA and IB are prime movers (internal combustion engines), 2A and 2B are alternating current generators, 3A and 3B are instrument current transformers (CT), 4A,
4B is a potential transformer PT, 5 is a load sharing device, 6A, 6
B is a control device, 7A and 7B are speed governors, 8A and 8B are circuit breakers, and 9 is a load such as an induction motor.

The load-side sharing device 5 connects CT3A (!: through PT4A,
The current and voltage of the alternator 2A are taken in through CT3B and PT4B, and the active power of both alternators 2A and 2B is detected and matched, and a signal corresponding to the difference in power is generated. It is sent to control devices 6A and 6B. The control devices 6A and 6B control the speed governors 7A and 7B according to signals from the load sharing device 5, control the rotational speeds of the prime movers IA and IB, and distribute the power load factor to each alternator on average. let

[Problem to be solved by the invention]

The conventional device has a load sharing device 5, but since it is not possible to determine whether the load sharing device 5 is operating normally, two AC generators are operated while the load sharing device 5 is out of order. , 2B may be operated in parallel.

This invention was made to solve the above problem.
The purpose of the present invention is to provide a generator output control device that can notify when the load sharing of alternating current generators running in parallel becomes abnormal, and can improve reliability compared to conventional methods. shall be.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an adder that detects the output difference between alternating current generators operated in parallel, and that sends a failure signal when the output of the adder continues to exceed a specified range for a predetermined period of time. It is equipped with a determiner to

[Effect]

In this invention, when the load sharing of the alternator is no longer average, the determiner sends out a failure signal, so it is possible to know that there is an abnormality in the device.

〔Example〕

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

In FIG. 1, IOA is a power detection device, and CT
The outputs of 3A and PT4A are taken in to detect the electric power sent out by the alternator 2A. IOB is a power detection device that takes in the outputs of CT3B and PT4B and detects the power sent out by AC generator 2B. Reference numeral 11 denotes an adder that takes in the outputs of the power detectors 10A and IOB and detects the difference (differential power) between the outputs of the alternating current generators 2A and 2B.

Reference numeral 12 denotes a determiner, which inputs the output of the adder 11 and determines whether the output is within a specified range or not, and sends out a failure signal if the state outside the specified range continues for a predetermined time T. . Reference numeral 13 indicates a failure indicating lamp 14, which is a failure buzzer.

FIG. 2 shows a block diagram of the operation of this embodiment.

In FIG. 2, 15 is a timer T816 which is an AND element.

In this configuration, if the difference between the outputs of the alternators 2A and 2B increases beyond the specified range and this state continues for a certain period of time T, the determiner 12 determines that the load sharing device 5 is not operating normally. The judgment is made and a fault signal is sent out, and this fault signal lights up the fault display lamp 13, and the fault buzzer 1 is activated.
4 rings.

〔Effect of the invention〕

As described above, the present invention can detect that the load sharing of the alternator is not being performed normally, so reliability can be improved compared to the conventional art.

[Brief explanation of the drawing]

FIG. 3 is a circuit diagram showing a force control device. In the figure, 2A, 2B-alternator, 5-load sharing device, IOA, 10BN-power detection device, 11-...-adder, 12-determiner, 13-lamp, 14-buzzer. Codes indicate the same or equivalent parts.

Claims (1)

[Claims] Detects the output difference between each alternator in a generator output control device that has a control device that detects the load sharing ratio of multiple alternators operated in parallel and controls the speed governor of each alternator. What is claimed is: 1. An output control device for a generator, comprising: an adder that outputs a fault signal when the output of the adder continues to exceed a specified range for a predetermined period of time.