SU989680A1 - Device for testing brushless exciter of synchronous generator - Google Patents

Description

The invention relates to electric machines, namely, devices for monitoring the state of the valves of a rectifier of a brushless exciter of a synchronous machine.

A device for monitoring a brushless driver, comprising rod-shaped conductors connected in series to the power circuits of the valves of the rotating rectifier and located on the outer surface of the rotating part of the driver, is known. In the rod-shaped current line of this device, as an element of the control device, the primary signal about the state of the valve is transformed in the form of a current, which flows through a conductor connected in series with the valve and the corresponding fuse / to the signal about the state of the valve transmitted in a contactless way with the rotating part of the driver through the magnetic field of the conductor, which is detected by an electromagnetic sensor mounted on the stator of the driver (1J,

During the breakdown of the valve and the blown fuse, the current through the conductor does not leak, and the sensor does not generate a signal on the magnetic field of this conductor when the conductor passes through them and the conductor is broken through and the burned out fuse t.

The rod-shaped conductor emitter used in the ston control device has an insufficiently high spatial localization of the electromagnetic channel created by it for transmitting signals about the state of the valve from the rotating part of the exciter. This is manifested in the distortion of the main sensor signal,

15, which is generated by the field of the conductor under the sensor, the interference that is generated by the magnetic fields of other conductors, especially those located nearby.

20

The presence of interference in the signals, formed on the sensor and the larger, the more closely the conductors are located closer to each other, increases the level of the exciter current, from which it can

25, the reliable operation of the registering instrument is ensured, and it stipulates the circuit of the instrument because of the need to use in it special circuits to separate the main signals from the signals coming from the sensor. The closest proposed is a device for controlling a brush actuator of a synchronous non-oscillator, containing rod-shaped conductors designed to 1 in series in the power circuits of the valves of the rotating rectifier, sensors for mounting the exciter on the stator and electromagnetic emitters mounted on the outer surface of the rotating part exciter C2. The known device controls electromagnetic emitters, made in the form of connected in series into the phase power circuits of the vents of rod-shaped conductors, each of which passes through an open and corresponding closed groove of two rows of spaced cores made of magnetic material. Thus, the conductors passing through the slots of the cores are placed on each core alternately disposed in a closed magnetic conduit covering the conductor. This reduces the degree of distortion of the main signal generated by the field of the conductor under the sensor, the interference that could be created by the magnetic fields of adjacent conductors if they were not covered by a closed magnetic field 5 water, however, leads to a complication of the design of the driver, in particular to increase its length, which is always undesirable for electric machines, as well as to the condition of a recording device to which signals from at least four sensors must be sent to such a device mounted on the stator of the exciter and does not provide sufficient accuracy of control. The aim of the invention is to improve the accuracy of the control. This goal is achieved by the fact that a device for controlling a brushless exciter of a synchronous generator on each conductor is located covering its core with a winding, the conclusions of which are connected to the conclusions of an electromagnetic radiation. One terminals of each pair of windings of ring cores placed on conductors of one phase bus are connected to the output of the radiator through elements with one-sided conductivity, and the other terminals of each pair of windings are connected to the output of the radiator directly. Pairs of windings of ring-shaped cores located on conductors to be turned on. in the power circuits connected in parallel through the fuses of the valves are connected in series. The emitter can be made in the form of a core with an open magnetic conduit on which the winding is placed. The drawing schematically depicts the proposed device. The control device has a conductor 1 in the form of a rod, the ends of which are connected to a valve 2 of a rotating rectifier of a brushless exciter and with a protective fuse 3. On the conductor 1 there is an electrical insulating sleeve 4 that provides insulation of the toroidal winding, 5 ring-shaped core 6, which surrounds the conductor 1. On the outer part of the winding 5 there is a safety case 7. The terminals 8 and 9 of the winding 5 of the ring-shaped core b are connected through a resistor 10 to the terminals 11 and 12 of the winding 13 of the core 14 a magnetic core, which is placed on the outer part of the structural element 15 of the rotating part of the exciter, rigidly fixed on the shaft 16 of the brushless exciter. The device works as follows. If the valve. 2 and the fuse 3 are intact, then when current appears in the conductor 1, which occurs when this branch of the rotating rectifier is turned on, or when it stops, when the branch is disconnected, an electromotive force occurs in the winding 5 of the annular core 6. It creates a pulsed current in the circuit formed by the winding 5 of the ring-shaped core b, the resistor 10 and the winding 13 of the core 14 with the TfcOM disconnected magnetic core, which, flowing through the winding 13, excites the magnetic field in the break zone of the magnetic core of the core 14. The presence of this field is detected by the sensor of the control device (not shown), which is fixed on the exciter stator in such a way that the rupture zone of the core 14 core passes under the sensor at the moments when the data branch of the rotating rectifier is turned on or off. These moments unambiguously correspond to a certain position of the rotor of the exciter, and if the sensor fixes the absence of a magnetic field at the corresponding position of the rotating, the rotor represents the exit signal of this branch of the rotating rectifier. As an electromagnetic radiator in the control device, not only the radiator can be used in the form core 14 with an open magnetic circuit and a winding 13, but also.

for example, an emitter on the LED that provides the possibility of obtaining a high spatial localization of the signal transmission channel from the rotating part of the exciter, which also differs in its complete noise immunity from the influence of the magnetic fields of both the external and the exciter itself.

The toroidal nature of the winding 5 of the ring-shaped core b, placed on the conductor 1, ensures high noise immunity of the signal formed at the output of this winding 5,. which can be enhanced by the manufacture of the barrel of the housing 7, which mechanically protects the outer surface of the winding 5, from magnetic material.

The conductor 1, on which the ring-shaped core b is placed, can be connected to a phase power circuit through which two valves of the anodic and cathodic branches of the rotatable de-energizer of the rectifier are powered. At the same time, in order to reveal the state of the valves in the control device, it is necessary to have two sensors located on the stator. Such a variant of the control device reduces the number of elements of the control device located on the gateway part of the exciter, but the electromagnetic emitters in this variant should provide the possibility of transmitting signals regardless of the direction of the current entering their input, as is the case, for example, emitter rfa core 14 with an open magnetic circuit.

The version of the control device with :: switching on the core conductors 1 between the valves and the fuses (see drawing) turns out to be more constructive in some cases,.

In a control device, the number of necessary electromagnetic radiators can be reduced in comparison with other, also possible variants of their location in power circuits. For this purpose, the leads of the windings of two ring-shaped cores b, which are located on the conductors 1 directly connected to the valves of the adjacent cathode and anode strands of the rectifier, are connected to the leads of the same electromagnetic radiator diodes,

The dissipation of the elements of the control device placed on the rotating part of the exciter is insignificant due to the pulsating nature of the currents flowing through its circuits.

The use of new elements, ring-shaped cores and electromagnetic emitters, the conclusions of which are connected to the terminals of the windings of the ring-shaped cores, allows improving the characteristics of the device for monitoring brushless exciters

l as a result of the possibility of using electromagnetic emitters with high spatial localization of the electromagnetic channel for transmitting signals from the rotating part of the exciter; improve the quality of the signals generated on the sensors, simplify the recording electronic device of the device; reduce the excitation current level; and consequently, increase the accuracy. Control.

The possibility of placing rod conductors anywhere in the power circuit of the valve, as well as the possibility of using electromagnetic emitters, which may have small

dimensions, extends the possible configurations of all the elements of both the rectifier and the control device located on the rotating part. exciter, and allows the ynpocTHvb design of powerful brushless exciters to have alternators with a large number of gates,

In addition, the device can be provided with full control of a brushless driver with a rectifier, in which there are groups of valves connected in parallel to each other. The connection of the leads of the radiator of the proposed device with series-connected windings of the ring-shaped cores of the valves of the paired group potsol7 will reduce the required number of emitters by half and thereby significantly simplify the design of such pathogens.

Claims (1)

Invention Formula 1, A device for monitoring a brushless synchronous generator exciter containing rod-shaped conductors for connecting a rotating rectifier in series to the power circuits of the valves, sensors for attaching the exciter to the stator, and electromagnet emitters, characterized in that the conductor is located enveloping its core with a winding, the conclusions of which are connected to the conclusions of the electromagnetic radiator,. 2, The device according to claim 1, 1, 1, 2, and one, that one terminals of each pair of windings of ring cores placed on conductors of one phase of the bus are connected to the output of the radiator through elements with one-sided conductivity, and others