JPS61262055A - Brushless exciter with abnormal condition detector - Google Patents

Abstract

PURPOSE:To enable faults to be detected in the range from armature windings to a rectifier, by setting the resistance of a phase ring higher than the resistance of a branch circuit, and only by providing the armature winding side of the phase ring with detecting elements. CONSTITUTION:When a rotor 8 is rotated and exciting current is conducted to a field magnet 18, then three phase alternating current is generated on armature windings 12. The alternating current is applied to a rotary rectifier through a connecting conductor 16. The, if there is any fault on the armature windings 12, the current on the windings is unbalanced. By the armature windings 12 and detecting elements 30 arranged at specified intervals, the unbalancing condition is detected an the fault is detected. besides, if there is any fault on the rectifier, the current on branch circuits 60a-60f is unbalanced. Then, the value of the resistance R of a phase ring 50 is set sufficiently larger than that of the resistance(r) of the branch circuit, and so said unbalanced current is transmitted to the armature windings 12, and also in this case, faults can be detected by the detecting elements 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a brushless exciter equipped with a device for detecting an abnormality in a rotary rectifier or the like.

[Shrub technology]

Fig. 2 shows a novo map of a 1-inch brushless exciter for abnormal configuration disclosed in Japanese Patent Application Laid-Open No. 58-82801. I'm in a magnetic field. , around the electric machine prewinding 1J (6), a stator field) is provided, and due to the 6-rotation field Q41 that constitutes the AC exciter 4 and the stator armature, the sub-exciter (to) is configured. In addition, the field (7) is automatic magnetic pressure A! i!
(to the device) is connected to the electric Qi.

FIG. 8 shows in detail the four commissural exciters, the rotary rectifying device, and the rotary rectifying device. The armature winding (B) is a large wire connection, with two parallel circuits in each phase, and the anti-neutral point side (with the inverted point) in the center is grouped for each phase by a phase ring (to). It is being The circuit-rectifier a0 is a three-phase full-wave connection,
l5-2P-4A (1 diode (10a) for each phase
The series is made into 2 parallel circuits, and the configuration is 4 arms in total.

The connection conductor port has a phase ring monument and a diode (1
It is G-connected to the two circuits (+ and one side) of 0a), and consists of two circuits for each phase.

Reincarnation of Kaibutsuko (8) and adding Exciting Rinshi to Kai 4ii (7).

1llIEf! 8-phase alternation occurs in A child winding 4. This alternating current is rectified in a rotary light adjustment device Q through a connecting conductor Qlt, and is supplied directly to the field (6) of the synchronous machine as tnc.

Sailing 4 bodies 4 01 (,n) orthogonality is detected by a fixed 4AI installed January pickup (31).

Now, if any one of the diodes (10a) has a failure and a short repair occurs, the value 'tlLcm of the conductor αQ connected to the diode +10a) changes.

That is, an imbalance occurs between the Ir flow and the Ir flow flowing through the other connecting conductors 4. Pick up this current disturbance (31)
to detect anomalies.

[The problem that the invention attempts to solve]

In the diary shrub device, there were kIA points during the following times.

First, connect the pickup coil i so that it is located between the columns of the connecting conductor Q, which is closer to the diode (10a) than the phase ring.
v■ is provided. Therefore, a fault that occurs on the armature winding (B) side from the phase ring (To) will not be detected.4J This is because the current unbalance due to a fault is averaged by the phase ring (7), and each connected conductor This is because αQ has an average length of 4 m.

Secondly, in order to eliminate the above-mentioned problem, if the ttttm child winds up, it will not be possible to detect a failure on the side of the light adjustment device ψ this summer.

8th ξIt may be possible to remove the phase ring so that failures occurring at any location can be detected, but this is also undesirable. This is because, without the 1L phase ring, the armature winding would be unbalanced magnetically and thermally.

This invention has the following features: between the above,
It is an object of the present invention to provide a brushless exciter that can eliminate failures occurring on either side of the NL armature winding 6) or the light adjustment device αQ while maintaining phase recirculation.

[Means for solving problems]

In this invention, the resistance between the two wires 9 and W on the phase ring to which the branch circuit layer from the circuit optical device is in contact is made ten ga larger than the resistance of the branch circuit layer. , the phase ring is made of a material with a small temperature coefficient of resistance,
The detection system is provided at a predetermined distance from the armature winding.

[Effect]

If there is a fault in the armature winding, the current in the armature winding becomes unbalanced. A detection system provided at a predetermined distance from the armature winding detects this unbalance of the electric ortr and detects a failure. Also, if there is a malfunction on the side of the silkworm flow device, there will be a fork in the road! i! Unbalanced or pressured by the flow.

Since the resistance of the phase ring is large, such unbalanced current is transmitted as six unbalanced currents to the six unbalanced currents. Therefore, the detection system detects this imbalance and detects a failure. Furthermore, since the OZ phase ring is made of a material with a small temperature coefficient of resistance, there is no possibility that the resistance value of the phase ring will abnormally increase due to a rise in temperature, and the phase ring itself will not lose its function.

〔Example〕

Fig. 1 shows a practical example of this invention.The four armature windings have a large diameter, each phase has 62 parallel circuits, and there is a neutral point at the center. The antipodal point side is grouped into each phase by a phase ring. The resistance value between the two wires of the phase ring group in which the parallel circuit of the armature winding (6) is 4tc is (R). A rotary light adjusting device (not shown) is connected to this phase ring q via the four sails. That is, for phase ring goodness, >f times, Q(60a) ~ (60f
) is connected, Ir) represents the resistance from the phase ring group looking toward the device side.

When the rotator <8) is rotated and the excitation type υIL is placed in the field (7), a three-way alternating current is generated in the armature winding. This alternating current is applied to the company's rectifier through the connecting conductor OtJ.

Now, if there is a failure in the armature winding (b), the armature winding g
It becomes unbalanced. A detection system (7) provided at a predetermined distance from the armature winding detects this imbalance,
Detect failure.

In addition, if there is a failure in the device for adjusting θ1, a branching cycle (60
Unbalance occurs in the currents a) to (60f). At this time, the resistance (R) of the phase ring is set to a sufficiently larger value than the resistance (Ir) of the branch winding, so the unbalance of the electric accent described above is transmitted to the armature winding (6). . Therefore, in this case as well, the detection system Senryo can detect the failure.

In addition, the resistance of phase ring 4? If the M degree coefficient is low, the resistance value will increase significantly as the temperature rises, and in extreme cases, there is a risk that the temperature will not be the same as in the summer. Therefore, the phase ring should be made of as much material as possible.

It is preferable to select No. 6, which has a small resistance temperature coefficient.

Nickel-copper, silicone bronze, etc., as shown in the table below, are suitable as materials that have a certain degree of resistance and a low temperature coefficient of resistance.

As the table detection system (7), in addition to the one that detects the magnetic flux due to the g current of the armature winding 4 as described above, there are also those that detect the high frequency current of the field (7). Any device that can detect imbalance may be used.

〔Effect of the invention〕

In the exciter according to the present invention, the resistance of the out-of-phase ring is higher than the resistance of the branch circuit. Therefore, by simply providing a detection system for the armature winding side of the phase ring, ilE
It is possible to detect a failure in the shaft rotation beyond the armature edge winding rectifier f.

In addition, since a phase ring is provided, although it has a high resistance, the magnetic surface and thermal unbalance of the armature winding is less than when no phase ring is provided at all.

Furthermore, since the phase ring is made of a material with a small temperature coefficient of resistance, the resistance value increases significantly when the temperature rises due to current, etc. (and the original function of the phase ring itself is lost). Nor.

[Brief explanation of the drawing]

Fig. 1 shows an example of the present invention, Fig. 2 shows a conventional abnormality detection device 1 and a brushless exciter, and Fig. 8 shows details of the vicinity of the detection confectionery. is the armature winding,
(to) is the detection system, and @ring is the phase ring. Note that the same reference numerals in each Figure A and A indicate the same or equivalent parts. Agent Patent attorney Otsuka Soshin Figure 1 12: Armature winding 30 niO Takako Kanade

Claims (1)

[Claims] (1) The resistance between two points where two adjacent branch circuits from the rotary rectifier are connected is sufficiently larger than the resistance of the branch circuit, and the phase ring is made of a material with a small temperature coefficient of resistance. A brushless exciter with an abnormality detection device, comprising: a detection element provided on the stator side so as to have a predetermined distance from the connected armature winding.