JPS589557A - Detecting circuit for trouble of rotary type rectifier in brushless generator - Google Patents

Abstract

PURPOSE:To detect the trouble early, and to prevent the spread of the trouble by mounting a trouble detecting coil to one part of a rotaty type rectifying circuit and deciding currents flowing through the detecting coil. CONSTITUTION:The trouble detecting coil 11 is set up to one part of the rotary type rectifier circuit, and the flow of currents through the detecting coil 11 is detected electromagnetically by means of a generator field current sensor 1 mounted outside the generator. When the output of the generator field current sensor 1 decreases during the operation of the generator, an alarm is given while an opening command is transmitted to a field circuit contactor and a generator breaker 14 after a fixed time limit by generating trouble signals from a rectifier trouble discriminating circuit 3. Accordingly, the spread of the trouble can be prevented because the trouble of the rotary type rectifier can early be detected positively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary rectifier failure detection circuit in a brushless generator.

In a conventional brushless generator, as shown in Fig. 1, when the field current If decreases due to a short circuit in the diode in the rotary rectifier 10 or a malfunction such as 0PEN, the generator output voltage decreases and automatic voltage adjustment is performed. The voltage increase operation is performed by the device 15, but if the voltage continues to drop even after doing so, the AC undervoltage relay 16 is operated and the field circuit contactor 12 is tripped.

In the case of a short circuit in the diodes in the rotary rectifier 10, the short circuit current continues for a long time.

There was a drawback that the armature winding 17 was blown away, further aggravating the failure. ′! Another drawback is that failure cannot be detected if the generator output hardly decreases due to an incomplete short circuit or the like.

An object of the present invention is to provide a complete rotary rectifier failure detection circuit for a brushless generator that can detect a failure of a rotary rectifier early and reliably and prevent the failure from expanding.

The main point of the present invention is that a fault detection coil is provided in a part of the circuit of the rotary rectifier, and the fact that current is flowing through the fault detection coil is detected electromagnetically by a generator field current sensor installed outside the generator. When the output of the generator field current sensor decreases during generator operation, a warning is issued by issuing a failure signal from the rotary rectifier failure determination circuit, and
By issuing an opening command to the field circuit contactor and generator circuit breaker after a certain period of time, the failure of the rotary rectifier is prevented from expanding.

FIGS. 2 and 3 show an embodiment of the present invention.

In FIG. 2, the rotary rectifier failure detection circuit according to the present invention includes a failure detection coil 11 provided in a part of the circuit of the rotary rectifier 10', a generator field current sensor 1, a pulse converter 2, and a rotary rectifier 10'. It is constituted by a rectifier failure determination circuit 3, and in FIG. 3, it is constituted by, in addition to the above, a function calculator 9 to which a signal from an exciter field current detection shunt 8 is input.

A block diagram of one embodiment of the present invention shown in FIG. 2 is shown in FIG. In FIG. 4, a decrease in the generator field current flowing through the failure detection coil 11 due to a short circuit of a diode in the rotary rectifier 10' or a failure such as 0PEN is electromagnetically detected by the generator field current sensor 1. It is input as a pulse signal to the pulse converter 2, where it is converted into a voltage signal. The voltage signal output from the pulse converter 2 is input to a rotary rectifier failure determination circuit 3, and then input to a relay module 5 via a signal level setter 4. A failure signal generated by the operation of the relay module 5 is outputted as an alarm signal by an AND circuit 6 with a signal indicating that the field switch 41, which is closed when the generator is in operation, is closed. Then, by means of an AND circuit 6 between this signal and a field current increasing direction control signal issued from the automatic voltage regulator 15 due to a decrease in the generator output voltage, a command is issued via a timer circuit 7 to open the field switch 41 after a certain period of time. and generator circuit breaker 5
Issue a 2G open circuit command.

A block diagram of an embodiment of the invention shown in FIG. 3 is shown in FIG. In FIG. 5, the voltage signal output from the pulse converter 2 is input to the rotary rectifier failure determination circuit 3', where it is detected by the signal comparator 10 and the shunt 8 for detecting the exciter field current. A comparison is made with the field current of the brushless exciter 13 input to the signal comparator 10 via the calculator 9, and when there is no generator field current sensor output corresponding to the field current, the relay module Operate 5. The following is the same as that explained with reference to FIG.

Since the present invention is configured and operated in this manner, the present invention has the effect of detecting a failure of the rotary rectifier early and reliably and preventing the failure from expanding.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the prior art, FIGS. 2 and 3 are circuit diagrams of the non-invention, and FIGS. 4 and 5 are block diagrams of FIGS. 2 and 3, respectively. 1... Generator field current sensor, 2... Pulse converter, 3... Rotating rectifier failure determination circuit, 8... Exciter field current detection shunt), 10.10'...・Rotary rectifier, 11... Failure detection coil, 12... Field circuit contactor, 13... Brushless exciter, 14...
Generator circuit breaker, 15... automatic voltage regulator, 16...
Insufficient exchange ridge l Mingu 2 figure

Claims (1)

[Claims] 1. A failure detection coil is provided in a part of the circuit of the rotary rectifier, and the fact that current is flowing through the failure detection coil is detected by a generator field current sensor installed outside the generator. A rotary rectifier failure detection circuit in a brushless generator is configured to detect a failure of the rotary rectifier due to a decrease in the output of a generator field current sensor during generator operation. 2. In claim 1, the condition that the generator is in operation according to the closing signal of the field circuit contactor is added to the rotary rectifier failure determination circuit, and the generator field current sensor signal is below a certain novel. A rotary rectifier failure detection circuit in a brushless generator, which is characterized by detecting a failure of the rotary rectifier due to the failure of the rotary rectifier. 3. In claim 1, in addition to the rotary rectifier failure determination circuit that detects the field current supplied to the brushless exciter, there is no generator field current sensor output corresponding to the field current. A rotary rectifier failure detection circuit in a brushless generator, which is characterized by detecting failure of the rotary rectifier. 4. In claims 1 to 3, based on the n;i failure signal obtained from the rotary rectifier failure determination circuit,
A rotary rectifier failure detection circuit for a brushless generator, characterized in that it issues an alarm and also issues an opening command to a field circuit contactor 41 and a generator circuit breaker after a certain time period. 5.tp! j Claim 4 In claim 4, the field circuit contactor and generator are activated after a certain period of time by ANDing the failure signal from the rotary rectifier failure advantageous circuit and the field current increasing direction control signal of the automatic voltage regulator. A rotary rectifier failure detection circuit in a brushless generator, which is characterized by issuing an open command to the circuit breaker.