JPH01107620A - On-load tap changer - Google Patents

Abstract

PURPOSE:To detect the abnormality of an on-load tap changer and to prevent accident thereby caused, by providing a motion detection section to detect a normal motion of a tap selector and a motion control section to control the motion of a changeover switch in reaction against the signal detected by this motion detection section. CONSTITUTION:When a changeover command is outputted from a tap change command generator 9, a signal is sent out to a tap selector operation circuit 10 of a motor operation mechanism 4 to operate a tap selector 3. A motion torque detector 8 detects the torque applied to a driving shaft 7 and outputs its detection signal to a decision section 11. On receiving the detection signal, the decision section 11 makes decision whether it is normal or abnormal as compared with a normal torque pattern and outputs a signal to a control section 12. If it is found as a normal signal, then a changeover signal is outputted to a changeover switching operation circuit 13 and actuates a changeover switch 2. If it is found as an abnormal signal, then it is decided as the failure of the tap selector 3 and actuates so as to output a signal to an abnormal display section 14 without actuating the changeover switch 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an on-load tap changer, and more particularly to an improvement in means for operating a tap changer using an electric operating mechanism.

(Prior art) In general, a tap changer on load is comprised of a tap changer main body and an electric operation mechanism.
By driving the electric operating mechanism in response to a switching command from the control device that controls it, the taps provided in the on-load tap switching transformer are switched and the voltage of the power transmission and distribution system is kept constant.

This tap changer body has an energy storage device that stores the driving force transmitted from the electric operating mechanism in an energy storage spring, and a switching opening/closing device that operates at a predetermined speed and cuts off the current by the release force of the energy storage device. The transformer consists of a cut-off part of the transformer, and a tap selector connected to the cut-off part and the tap of the transformer tap winding to select the tap in a no-current state.

Conventionally, in an on-load tap switching device configured as described above, an electric operating mechanism that receives a tap switching signal operates for a predetermined number of revolutions necessary to switch one tap, and then the electric operating mechanism that receives the switching signal operates. The rotational force transmitted from the mechanism is simultaneously transmitted to the energy storage device and the tap selector via the transmission shaft, and while the energy storage spring of the energy storage device is charged, the tap selector is operated and the tap selector is operated in a no-current state. Select next tap.

While the tap selector completes the tap selection operation, the energy accumulator completes the energy accumulation operation, releases the energy storage, and uses the force to operate the interrupter of the switching switch. A circuit is now formed to the newly selected tap side.

Complete 1-tap switching. The process from the start of the operation of the operating mechanism of the electric operating mechanism, the operation of the tap selector, the operation of the cutoff section by the energy storage device, and the operation of the electric operating mechanism until the electric operating mechanism stops is a series of operations, and the operation and the order of operation are mechanically determined. It is maintained in the configuration.

(Problems to be Solved by the Invention) In the on-load tap changer configured as described above, the movement of each component is maintained accurately by the mechanical configuration. However, on the other hand, since the movement is controlled mechanically, there is a serious problem in that the tap switching operation continues even if some of the components have a problem.

To explain in detail, when switching taps, the tap selector first switches to the next tap with no current, but at this time an abnormality occurs in the tap selector, for example, an abnormality occurs in the drive system and the tap is switched. Suppose that the selector stops moving during tap selection. However, the switching switch operates independently of the tap selector, releases the stored power from the stored energy operation, and attempts to switch the cutoff section. However, due to an abnormality in the tap selector, no circuit is formed in the tap to be switched at this time. In other words, since there is no commutation path for the shutoff section, the shutoff section may exceed its shutoff ability and become unable to shut off, leading to a major accident.

The present invention was made in view of the above problems, and its purpose is to detect an abnormality in a tap changer on load.
An object of the present invention is to provide an on-load tap switching device having a function of preventing serious accidents.

[Structure of the invention]

(Means for Solving the Problems) An operation of detecting normal operation of the tap selector when the tap selector operates independently when the load selector according to the present invention operates independently. A detection section and an operation control section that controls the operation of the switching switch in response to a signal detected by the operation detection section are provided.

(Function) The electric operating mechanism that receives the tap switching command operates the tap selector alone. The operation detection section detects the operation of the tap selector, and the operation control section that receives the detection signal determines whether it is normal or abnormal.If the operation is normal, it issues switch No. 48 of the switching switch to the electric operation mechanism. , without issuing a switching signal in case of abnormal operation? Issue 7 reports.

(Embodiment) An embodiment of the on-load tap switching device of the present invention will be described below with reference to FIGS. 1 and 2. The on-load tap switching device consists of a switching switch 2 and a tap selector 3 housed in a transformer tank 1, and an electric operating mechanism 4 disposed outside the transformer tank 1. The tap selector 3 is connected to the electric operating mechanism 4 via the switching opening/closing operating shaft 5 and the tap selector operating shaft 6, and is configured to be able to operate each independently. Further, an operating torque detector 8 is attached to the drive shaft 7 of the tap selector 3.

Next, the operation of the present invention will be explained with reference to the block diagram shown in FIG. When a switching command is output from the tap switching command generating section 9, a signal is sent to the tap selector operating circuit 10 of the electric operating mechanism 4, and the tap selector 3 is operated. At this time, the operating torque detector 8 detects the torque applied to the drive shaft 7 of the tap selector 3 and outputs the detection signal to the 1 determining section 11. The determination unit 11 that receives the detection signal compares it with a normal torque pattern stored in advance, determines whether it is normal or abnormal, and operates to output a signal to the control unit 12. When the control unit 12 receives the signal, if it is a normal signal, it outputs a switching signal to the switching operation circuit 13, operates the switching switch 2, and completes the one-tap switching.

If it is an abnormal signal, it is determined that the tap selector 3 is malfunctioning, and the operation is performed to output a signal to the abnormality display section 14, and the switching switch 2
According to the present invention, first, the tap selector is operated alone, and the operation is detected by the operating torque detector, and the operation is normal. After determining that, the switching switch is operated, so
If there is an abnormality in the tap selector, for example if the operation stops during tap selection, the operating torque detector does not generate the normal torque that occurs when the tap selector operates, and the determination unit It is determined that there is an abnormality and the switching switch does not operate. Therefore, there is an effect that accidents involving the switching switch can be prevented.

3 and 4 show another embodiment of the present invention.
In the illustrated embodiment, the operation was detected by a torque detector attached to the drive shaft of the tap selector, but in this embodiment, as shown in FIG. The operation of the tap selector 3 is detected by a proximity switch A17 mounted on the shaft 16 and a proximity switch B20 mounted on the column 19 to which the fixed contact 18 is attached. Proximity switches A17 and B20 are position detectors that output signals when they stop at opposing positions. Since this proximity switch Al element and B20 are installed at the position of the movable contact 15 and the position of the fixed contact 18 of the tap selector 3, the tap selector 3 operates normally and the movable contact 15 is connected to the fixed contact 18. When stopped in the normal position, proximity switches A17 and 820 output a signal. This signal is sent to the control section 12 of the electric operating mechanism 4 shown in FIG. In response to this signal, the control section 12 outputs a switching signal to the switching operation circuit 13 to operate the switching switch 2. if.

If the tap selector stops mid-operation, the signals from proximity switches A17 and 82G will not be output.
The control unit 12 determines that the tap selector 3 is abnormal when the time set by the alarm timer elapses while waiting for a signal, outputs a signal to the abnormality display unit 14, and does not operate the switching switch 2. In this way, since the operation of the switching switch is controlled after detecting the operation of the tap selector, accidents can be prevented.

FIGS. 5 and 6 show still other embodiments.

In the embodiment shown in FIG. 1, an operating torque detector 8 is attached to the drive shaft 7 of the tap selector, but in this embodiment, a rotation detector 21 is attached to the drive shaft 7 of the tap selector 3 as shown in FIG. It is something to be worn. The operation will be explained with reference to FIG.

When a switching command is output from the tap switching command generating section 9, a signal is passed to the tap selector operating circuit 10 of the electric operating mechanism 4, and the tap selector 3 is operated. At this time, the rotation detector 21
detects the rotational speed of the drive shaft 7 of the tap selector 3 and outputs the detection signal to the 1 determination section 11. Upon receiving the detection signal, the determination section 11 compares the rotation speed with a pre-stored normal rotation speed, determines whether the rotation speed is normal, and operates to output a signal to the control section 12. Upon receiving the signal, the control section 12 outputs a switching signal to the switching switch operation circuit 13 to operate the switching switch 2 if the signal is normal. If there is an abnormal signal,
4 It is determined that the tap selector is malfunctioning, and a signal is output to the abnormality display section 14, and the switching switch 2 is not operated.1 This embodiment also detects the rotation of the drive shaft of the tap selector! Since the operation of the switching switch is controlled after detecting the operation in the form of
Accidents can be prevented.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a tap selector.

It has a mechanism that operates the switching switch independently, and the motor operating mechanism that receives the switching command operates the tap selector in the no-current state independently, and detects the operation with the operation detector installed in the tap selector section. In response to the detection signal, the control section installed in the electric operating mechanism controls the operation of the switching switch.When the normal operation of the tap selector is detected, the control section operates the switching switch and starts a new switch. Switch the circuit to the selected tap,
Complete 1-tap switching. However, if an abnormal operation is detected, the switching switch is not operated and an abnormality display is displayed, which has the effect of automatically detecting the abnormality with high accuracy and preventing accidents.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of the first embodiment of the present invention, Fig. 2 is a block diagram of the first embodiment, Fig. 3 is a partial structural diagram of the second embodiment, and Fig. 4 is a structural diagram of the second embodiment. FIG. 5 is a block diagram of the embodiment, FIG. 5 is a structural diagram of the third embodiment, and FIG. 6 is a block diagram of the third embodiment. 1...Transformer tank 2...Switch switch 3
...Tap selector 4...Electric operation mechanism 5
...Switching switch operating axis 6...Tap selector operating axis 7...Drive shaft 8...Operating torque detector 9...Tap switching command generation section lO...Tap selector operating circuit 11 ...judgment section
12...Control unit 13...Switch switch operation circuit 1
4... Abnormality display section 15... Movable contact
16... Drive shaft 17... Proximity switch A
18... Fixed contact 19... Support column
20... Proximity switch B21... Rotation detector agent Patent attorney Rule Ken Chika Yudo Ken Daishimaru Figure 1 Figure 2c (I Figure 3/J Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A load tap switching device consisting of a tap selector and a switching switch has a mechanism for independently operating the tap selector and switching switch, and controls the operation of the tap selector when the tap selector operates. 1. An on-load tap switching device, comprising: an operation detection section for detecting the operation; and an operation control section for controlling the operation of a switching switch in response to a signal detected by the operation detection section.