JPH04117104A - Section controller for ground linear motor - Google Patents

Abstract

PURPOSE:To prevent serious fault, which requires interruption of power supply to coils and long recovery time, upon occurrence of abnormality by inspecting the state of coil by means of a tester built in a section controller prior to conduction of the thrust coil of a linear motor. CONSTITUTION:Thrust coil 4 of a linear motor vehicle 1 is sectioned into minimum unit sections which are then switched sequentially by means of a switch 5 thus feeding the thrust coil 4 with driving current. Upon provision of a coil abnormality signal from a section controller 7, output from a converter 17 in that section is blocked through a coil switch controller 12. The linear motor vehicle 1 is decelerated through a protector 13 before it enters into the faulty section and passes through the faulty section with low speed thus suppressing impact.

Description

[Detailed description of the invention] C. Purpose of the invention] (Industrial application field) INDUSTRIAL APPLICABILITY The present invention is used in magnetic levitation trains and the like.

Detects an abnormality in the propulsion coil of the ground primary linear motor,
Section control of the ground primary linear motor that has the function of protecting the power converter that supplies power to the propulsion coil and the superconducting magnet that is attached to the vehicle and acts as an armature that provides thrust from being subjected to large impact forces. Regarding equipment.

(Prior art) The conventional coil switch of the ground primary linear motor was
As shown in the figure. The propulsion coil 4 is controlled to be powered in a primary manner.

The position of train 1 is detected by a position detection device such as a cross-guide line, and each section consisting of multiple coils is connected as the train moves so that power is supplied only to the propulsion coil corresponding to the position of one train. The switches installed in the terminal are opened and closed in sequence.

With this configuration, the power conversion device.

Since no more current than necessary is passed through the coil, the capacity of the converter can be reduced.

(Problem to be Solved by the Invention) However, since the propulsion coil is supplied with high voltage, if there is a ground fault or a short circuit between phases at the coil or cable connection, the power converter may go into protective operation. In addition to burning out the coils and cables, in some cases, when a superconducting magnet passes over the coil that caused the accident,
A large impact force is applied to the superconducting magnet, causing the superconducting state to break (quench) in an instant, and even destroy the superconducting magnet.

If such a failure occurs, it will take time to restore the system, which could have a serious impact on the on-time operation of trains.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention determines whether the coil is good or bad before the train approaches the coil, and if there is an abnormality, the coil The purpose of the present invention is to provide a ``section control device for a ground primary linear motor'' that prevents a major failure from occurring that would require a long time to restore by stopping the power supply to the ground linear motor.

(Function) In the present invention, we focus on the fact that the propulsion coil of the linear motor is not always supplied with power, but is energized only when the train passes through the section of the propulsion coil. The condition of the coil is inspected by a test device installed in the section control device, and if there are no abnormalities, the propulsion current from the power converter is passed at the specified timing when the train enters the relevant propulsion coil section. . If an abnormality was detected, a system was installed at the substation. The abnormal coil section is transmitted to the section control control device, and measures are taken to prevent propulsion current from flowing into the abnormal coil section using gate blocks, etc. In addition, in the coil sections before and after the abnormal section, when a train enters the abnormal section,
By controlling the propulsion current to narrow down and start up so that excessive jerk does not occur due to sudden changes in thrust, it protects linear motor trains from serious failures that will hinder operation for a long time, and forms a near motor section control device. I can do that.

(Embodiment) FIG. 1 shows an embodiment of a section control device of the present invention. The propulsion coil 1 is configured to be connected to a feeder line via a coil switch 2. Furthermore, an abnormality detector switch 3 is connected in parallel between the propulsion coil and the coil switch 2 as seen from the power source side, as shown in the figure. From the abnormality detector switch 3, a current detector 7 and a limiting impedance 5 are connected to a high frequency power source 4. The high frequency power supply 4 is connected in a star shape,
Its neutral point is grounded via the leakage current detector 8.

Further, each phase voltage of the high frequency power supply 4 is detected by a voltage detector 6. The output of each current/voltage detector is given to an arithmetic control section of the abnormality detection device via an amplifier 9. The arithmetic control section is connected to a signal transmission device 12 via a divider 10 and a comparator 11.

Further, from the transmission device, via the test control device 13, the coil switch 2. Abnormality detector switch 3 and high frequency power supply 4
The configuration is such that it can be commanded to turn on or off.

FIG. 2 shows the relationship between the section control device of the present invention and a travel control system for a linear motor car.

With reference to FIG. 2, the function of the section control device of the present invention in a floating railway running control system will be explained. 7 in the figure is a section control device of the present invention. linear motor car 1
is supported by a truck to which a superconducting magnet 2 is attached, and travels along a propulsion coil 4. At this time, the drive current supplied to the propulsion coil 4 is distributed to the smallest unit in which the train is running, since supplying the drive current to all propulsion coils would result in significant reactive current and poor efficiency. The section is divided into one section, and as one train runs, the sections are sequentially switched by the switch 5 to supply power. The position of the train is detected by a position detection device 3, such as a crossing guide line, and transmitted to a substation by a position signal transmission device [8].

At the substation, the position signal is a safety device! 13. Speed control device 15. It is provided to the converter control device [16, coil switch control device 12, etc.].

The position signal is time differentiated by the speed detection device 14, and
A speed signal is calculated. The speed control device [15] calculates a current peak value from the "speed command" and the position/speed signal, and instructs the converter control device 16 to calculate the current peak value. On the other hand, the coil switch control device 12 determines the section in which the train is running based on the position signal, and sends an ON command to the transmission device 10 to turn on the coil switch of the section in which the train is running. A signal is given to 16 to bring the coil switch into a no-current state when the coil switch is in the ○N/○FF state.

FIG. 3 shows the temporal relationship between the converter output A and the coil switch closing command B at this time. In the section control device of the present invention, the fixed time (tn) of the closing period (tn) of the coil switch is
Before a), a coil test period as shown in abnormality detection period C in Figure 3 is set for the period (b), and if an abnormality in the coil is detected during this period, (a-b) During the subsequent coil energization period, the output of the converter is blocked to prevent excessive fault current from flowing through the converter or coil. In some cases, measures may be taken to reduce the speed of the vehicle before it reaches the section of the coil where the failure has been detected, reducing the impact on the superconducting magnets on the top of the vehicle and the passengers when passing over the failed propulsion coil. conduct.

The operation of the section control device of the present invention will be explained with reference to FIG. The coil switch 2, the abnormality detector switch 3, and the high frequency power source 4 are operated by the test control device 1 of FIG. 1 in response to a timing signal as shown in FIG.
A command is given to 3.

The test control device 13 at the timing shown in FIG.
Operation commands are issued to the high frequency power supply, coil switch, and abnormality detector switch. The output voltage of the high-frequency power source that serves as the test power source for the propulsion coil should be higher than the output voltage of the converter that supplies the propulsion current, so that it can be confirmed that the insulation has not deteriorated. Also.

Since the propulsion coil is an inductive load, the frequency of the test power supply is set higher than the output frequency of the actual converter, and the impedance of the propulsion coil is made higher than when it is powered by the propulsion power converter. Reduce the current capacity of the power supply.

In the section control device having the configuration of the present invention shown in FIG. 1, each detection signal during high-frequency power supply operation detected by the voltage detector 6, current detector 7, and leakage current detector 8 is
By dividing each phase voltage by each phase current using a divider, the impedance of each phase of the propulsion coil can be determined. Furthermore, by dividing each phase voltage by the ground leakage current detected by the leakage current detector 8, the ground insulation resistance can be determined. The coil impedance and coil insulation resistance obtained in this way are compared with the specified values. If they are lower than the specified values, there may be a short circuit between the coil layers or a ground fault due to insulation breakdown, so the signal The transmission device 12 is commanded to send a failure signal.

When a coil abnormality signal is transmitted from the section control device 7 in FIG. 2, the output of the converter 17 in the corresponding section is blocked via the coil switch control device [12]. Also, safety gear! 13, the vehicle is decelerated before reaching the faulty section to reduce the passing speed at the faulty section and reduce the impact.

As described above, according to the section control device for the ground primary linear motor shown in the embodiment, even if a dielectric breakdown or a ground fault occurs in the propulsion coil, a propulsion current with a large bank power is supplied to the propulsion coil. Since it is possible to determine whether there is an abnormality in the propulsion coil before the failure occurs, it is possible to de-energize the section of the failed propulsion coil to prevent fault current from flowing to the power converter. Additionally, if it is possible to decelerate the train before it reaches the faulty coil, it is possible to reduce the impact force that the superconducting magnet receives as a magnetic reaction from the short circuit when the superconducting magnet passes over the faulty coil. can be prevented from being quenched due to excessive impact force.

In the embodiment shown in Fig. 1, an AC power source with a higher frequency than the output of the converter that sends the propulsion current is used as the power supply device for testing the state of the propulsion coil, and the capacity of the test power source is lower than the capacity of the propulsion converter. However, a similar evaluation of the propulsion coil can be performed using an impulse power source as the test power source.

〔Effect of the invention〕

In a superconducting magnetic levitation railway that is propelled by a ground primary linear motor, a significant number of propulsion coils are installed on the track, and they are charged with a supervoltage power source of several thousand kV or more, so the propulsion coils are extremely requires a high degree of reliability,
Accidents such as interlayer short circuits and ground faults in propulsion coils are possible failures, and the system must be constructed to minimize the ripple effects of accidents.

In particular, if the superconducting magnet quenches, it will be unable to maintain levitation and the system will go down. Therefore, by using the section control device of the present invention, the reliability of superconducting magnetic levitation railways can be dramatically improved. Demonstrates excellent effects.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the section control device of the present invention, Fig. 2 is a control system diagram of a ground primary linear motor propulsion maglev railway using the section control device of the present invention, and Fig. 3 is a diagram of adjacent mutual sections. A timing chart showing the relationship between the abnormality detection period of the control device and the closing command of the coil switch, FIG. 4 is a timing chart showing the operation of one section control device of the present invention, and FIG. 5 is a conventional section control device. FIG. 1 is a control system diagram of a ground primary linear motor propulsion magnetic levitation railway using 1... Propulsion coil 2... Coil switch 3...
- Abnormality detector switch 4...High frequency power supply 5...Limiting impedance 6-...Voltage detector 7...Current detector 8...Leakage current detector 9...Amplifier 1
0...Divider 11...Comparator 12...
Signal transmission device 13...Test control device Agent Patent attorney Noriyuki Chika Figure 2 Figure 1 Figure

Claims (1)

[Claims] A linear motor consisting of a propulsion coil of the ground primary linear motor, a power conversion device that generates a variable voltage, variable frequency AC power source to flow a propulsion current to the propulsion coil, and a switch located between the propulsion coil and the power conversion device. On the propulsion coil side of the coil switch, a switch that closes only when testing the coil, a high-frequency AC power source, a high-frequency AC current detector, and a current limiting impedance are installed, and voltage detection detects the phase voltage of the high-frequency power output on the coil side. A section control device for a ground primary linear motor, characterized by being equipped with a current detector that detects the zero-phase current of a high-frequency AC power supply.