JPH0445226Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of a motor control circuit for an on-load tap switching device having a skipping tap.

[Conventional technology]

FIG. 4 is a circuit diagram showing a conventionally used connection configuration between a transformer main winding and an on-load tap switching device. In the figure, 1 is the transformer main winding, 2 is an on-load tap switching device, and 3 is a tap winding; 4 is a tap selector having rotary type first contacts A to tenth contacts K connected to this tap winding 3; 5 and 6 are polarity switchers connected to this tap selector 4. and a switching switch. The above-mentioned tap winding 3 is of an 8-step type having the first tap A to the ninth tap i, and the first contact A to the ninth contact I of the above-mentioned tap selector 4 correspond to the first tap winding 3. They are connected correspondingly to the taps a to 9th tap i, respectively.

7 and 8 are the first and second output terminals of the tap selector 4, respectively.
It is configured so that it can be connected to the first contact A to the tenth contact K of the tap selector 4 via the second rotary contact pieces 7a and 8a.

The common terminal 5a of the polarity switch 5 described above is connected to the first tap 1a of the transformer main winding 1, and the first terminal 5b, which is the negative pole, is connected to the first contact A of the tap selector 4. The second terminal 5c, which is a positive pole, is connected to the ninth contact I. The tenth contact K of the tap selector 4 and the common terminal 5a of the polarity switch 5 are connected by a conductor 21. Reference numeral 9 denotes a polarity switching contact piece provided on the polarity switching device 5.

6a and 6b in the aforementioned switching switch 6 are a first switching terminal and a second switching terminal connected to the first and second output terminals 7 and 8 of the aforementioned tap selector 4, respectively.
These first and second switching terminals 6a and 6b are switched by a switching contact piece 6c.

When changing the polarity using the polarity switch 5 described above to obtain the 19-tap position, as shown in FIG.
The three tap positions a, 9b and 9c are the same potential taps with no voltage change.

Switching control of the same potential taps one tap at a time causes a delay in the voltage adjustment operation, so in the above example, the tap positions 9a and 9c are set in the electric operating mechanism of the load tap switching device, as described below for the skip tap control. A method is adopted in which a circuit is provided to automatically pass through 9a and 9c.

Furthermore, in order to rotationally drive the drive motor (not shown) of the tap switching device shown in FIG. 4, FIG. A portion of FIG. 3 shows the operation sequence of the switch controlling the electromagnetic contactor in the skip tap control circuit shown in FIG. 2. (In addition, FIG. 3 is shared with the operation sequence of the skip tap control circuit shown in FIG. 1, which will be described later.) In FIG. A first electromagnetic contactor 11 is a second electromagnetic contactor that performs a downward rotation operation of this drive motor, and these electromagnetic contactors 10 and 11 are self-holding contacts 10a and 1
1a and each interlock contact 10b, 11
It has b. 12 is a first limit switch that turns off at the upper limit, 13 is a second limit switch that turns off at the lower limit, 14 is a first push button switch for upward rotation operation, 15 is a second push button switch for downward rotation operation, and 16 is a first limit switch. and a first conversion relay for turning on and off the second mercury contacts 16a and 16b, and a second conversion relay 17 for turning on and off the first and second mercury contacts 17a and 17b, and 18 not shown. It is a changeover switch driven by an energy storage mechanism to alternately switch the first contacts 18a and 18b at the next tap position. 19 is the second
This is a position switch connected to the limit switch 13 and the conversion switch 18, and when the position switch 19 is turned on at the skip taps 9a and 9c, a skip tap control circuit is easily formed.

The conventional mercury switch shown in FIG. 2 is constructed as described above, and its operation will be explained below.

In the case of the conversion relay using the aforementioned mercury switch, for example, if we consider a state in which the switch is switched from tap position 8 to tap position 9a in FIG. 3 and stopped at tap position 9a, conversion relay 1
8 comes to the tap position 9a and the first contact 18a
If the switch is made from the first contact 18b to the second contact 18b, then the first
As a result of the conversion relay 16 being energized and tilting the mercury switch, each mercury contact 16a of the first conversion relay 16
and 16b are turned on, and each mercury contact 17a and 17b of the second conversion relay 17 is turned off. Therefore, a circuit passing through the first mercury contact 16a of the first conversion relay 16 and the second contact 18b of the conversion switch 18 is formed, thereby forming an energizing circuit for the electromagnetic contactors 10 and 11. In this case, since the switching speed between the contacts 18a and 18b of the switching switch 18 is too fast, a mercury switch is used in order to allow enough time for each electromagnetic contactor 10, 11 to de-energize. .

Therefore, when switching from tap position 8 to tap position 9a, when the first push button switch 14 is pressed, the first electromagnetic contactor 10 is energized and the motor (not shown) is rotated, and the transition is made from tap position 8 to tap position 9a. During the process, the position switch 19 is turned on. As a result, the first
The electromagnetic contactor 10 is energized via the first contact 17a of the second transfer relay 17 and the first contact 18a of the transfer switch 18.

Next, when the tap position 9a is reached, the changeover switch 18 switches from the first contact 18a to the second contact 18b.
, and the first changeover relay 16 is energized (in this case, the first pushbutton switch 14 must be returned to its original position). As a result, each contact 16a, 1
6b is turned on, and each contact 17a, 17b of the second conversion relay 17 is turned off. In this state, the first
The electromagnetic contactor 10 is energized via the first contact 16a of the first transfer relay 16, the second contact 18b of the transfer switch 18, and the position switch 19.

Further, on the way from tap position 9a to tap position 9b, position switch 19 is turned off, but first electromagnetic contactor 10 is connected to first transfer relay 16.
The first contact 16a of the switch 18 and the second contact 18b of the changeover switch 18 are energized. When the tap position 9b is reached, the contact of the changeover switch 18 is switched from the second contact 18b to the first contact 18a, whereby the first electromagnetic contactor 10 is de-energized, the motor stops, and the tap switching device 2 is switched off. It stops at tap position 9b.

In addition, by switching from the second contact 18b to the first contact 18a of the transfer switch 18, the coil of the second transfer relay 17 is energized, and the mercury contacts 17a, 17 are energized.
b is switched, and preparations are made to accept the next operation of the first and second pushbutton switches 14 and 15.

Therefore, in the conventional configuration using the mercury switch as described above, skip tap control can be achieved simply by adding the position switch 19 at the position shown by the dotted line in FIG.

Furthermore, FIG. 6 shows the mercury contacts 16a and 16 in the skip tap control circuit shown in FIG.
First and second using b, 17a and 17b
It is a circuit diagram showing a skip tap control circuit using two electromagnetic relays instead of conversion relays 16 and 17, and includes a first electromagnetic contactor 10, a second electromagnetic contactor 11, a first limit switch 12, and a second limit switch 13. , the first pushbutton switch 14, the second
Push button switch 15 and conversion switch 18
has the same function as the one shown in FIG. 2, so the same reference numerals are given and the explanation thereof will be omitted.

The conventional structure shown in FIG. 6 includes the mercury contact type first and second contacts in the structure shown in FIG.
The first electromagnetic relay is used instead of the switching relays 16 and 17.
A conversion relay 16A and a second conversion relay 17A are provided, and a first self-holding contact 16Aa, an interlock contact 17Ac and a second self-holding contact 16Ab of the second conversion relay 17A are connected to the first conversion relay 16A. There is. In addition, the second conversion relay 17A has a first self-holding contact 17Aa and a first
Interlock contact 16 of conversion relay 16A
Ac and second self-holding contact 17Ab are connected.

Further, a position switch 19 which is turned on by a skip tap is connected between the second limit switch 13 and the changeover switch 18 as shown by a dotted line.

[Problem that the invention attempts to solve]

The skipping tap control circuit of the conventional on-load tap switching device is configured as described above, so, for example, in the conventional configuration shown in Fig. 2, the above-mentioned conversion relay using a mercury switch is required. Mercury switches have become extremely difficult to manufacture in recent years due to mercury pollution problems, and instead, a drive motor control circuit using two electromagnetic conversion relays as shown in Figure 6 has been put into practical use. , for such a drive motor control circuit, as in the case of the control circuit shown in FIG.
When the position switch 19 that turns on at c is added, the electromagnetic conversion relays 16A and 17A are continuously energized through the additional circuit of the position switch 19. There was a problem in that the circuit was turned off and deenergized, making it impossible to pass the skip tap.

This idea was made to solve the above-mentioned problems, and in addition to a position switch that turns on with a quick tap, it adds a time-limited relay with at least two instantaneous contacts and one time-limited contact. The purpose of this invention is to obtain a skip tap control circuit for an on-load tap switching device using an electromagnetic conversion relay that can operate accurately.

[Means for solving problems]

The skip tap control circuit of the on-load tap switching device according to this invention includes a time relay energized by a position switch that is turned on by a skip tap, and at least two instantaneous contacts and one time contact provided on the time relay. The configuration includes the following.

[Effect]

In the skip-tap controlled rotation of the on-load tap switching device in this invention, the first instantaneous contact of the time-limiting relay continuously energizes the pair of electromagnetic contactors at the skip tap, and the second instantaneous contact of the time-limiting relay continuously energizes the pair of electromagnetic contactors at the skip tap. The time contact contacts deenergize one of the transfer relays.

〔Example〕

Fig. 1 is a circuit diagram showing an embodiment of this invention, and the on-load tap switching device shown in Fig. 4 and the operation diagram of Fig. 5 are the same as the embodiment of this invention. shall be taken as a thing.

In the drawings, reference numeral 10 indicates a tap switching device 2 [fourth
11 is a second electromagnetic contactor for performing a downward rotation operation of the drive motor, and these electromagnetic contactors 10, 11 has self-holding contacts 10a, 11a and respective interlock contacts 11b, 10b. 12 is a first limit switch that is turned off at the upper limit; 13 is a second limit switch that is turned off at the lower limit; 14 is a first push button switch for upward rotation operation having first and second contacts 14a and 14b; 15 is a first; Second contact 15a, 1
The second push-button switch 16A and 17A are electromagnetic type first and second conversion relays, and this first conversion relay 16A
The first self-holding contact 16Aa, the interlock contact 17Ac of the second conversion relay 17A, and the second
A self-holding contact 16Ab is connected. Further, the second conversion relay 17A has a first self-holding contact 17.
Aa, the interlock contact 16Ac of the first conversion relay 16A, and the second self-holding contact 17Ab are connected.

18 is driven by an energy storage mechanism (not shown) to open the first contacts 18a and 1 at the next tap position.
The first conversion relay 16A is a changeover switch for alternately switching the changeover switch 8b.
8, and the second conversion relay 17A is connected to the second contact 18b of this conversion switch 18.
It is connected to the.

19A is a position switch that is turned on by skipping taps 9a and 9c, and is connected between the third contact 18c of the conversion switch 18 and the self-holding contact 11a of the electromagnetic contactor 11. A time limit relay 20 energized by position switch 19A is connected in series. The first momentary contact 20 of this time-limited relay 20
a is connected to the third contact 18c of the conversion switch 18 and the first and second limit switches 12 and 13 to continuously energize the first and second electromagnetic contactors 10 and 11 with a skipping tap, and the second instantaneous contact 20b is connected in parallel to the first self-holding contact 16Aa of the first transfer relay 16A to energize the first and second transfer relays 16A and 17A, and the time limit contact 20c is connected in series with the first transfer relay 16A. When connected, this first switching relay 16A is deenergized.

The skipping tap control circuit of the on-load tap switching device according to this invention is constructed as described above.
The operation will be explained below.

For example, a case will be described in which the first push button switch 14 for the upward rotation operation is pressed from the tap position 8 in FIG. 3 to skip past the tap 9a and stop at the tap 9b.

In the above-mentioned state, the first pushbutton switch 14 and the second pushbutton switch 15 are not operated.
The second contacts 14b and 15b are closed, and
The first contact 18a of the changeover switch 18 is in a conductive state. Therefore, the first conversion relay 16A includes the second contact 14b of the first pushbutton switch 14, the second contact 15b of the second pushbutton switch 15, the unillustrated coil of the first conversion relay 16A, and the second conversion relay 1.
7A interlock contact 17Ac, time limit contact 20c of time limit relay 20, and first contact 18a of transfer switch 18 are energized, self-holding contacts 16Aa and 16Ab are on, and interlock contact 16Ac is off.

Next, press the first push button switch 1 for raising rotation operation.
4, the first electromagnetic contactor 10 switches the first contact 14a of the first pushbutton switch 14, the unillustrated coil of the first electromagnetic contactor 10, the interlock contact 11b of the second electromagnetic contactor 11, and the first limit switch. 12. Second self-holding contact 16Ab of first conversion relay 16A and first contact 1 of conversion switch 18
8a and its self-retaining contact 10a
is turned on, and interlock contact 10b is turned off. As a result, power is supplied to a drive motor (not shown), and the motor starts rotating.

When the tap positions 8 and 9a are reached in the above-mentioned state, the position switch 19A is turned on, thereby energizing the time limit relay 20, and its instantaneous contacts 20a and 20b are turned on. As a result, the first electromagnetic contactor 10 is connected to the first conversion relay 16A.
2nd self-holding contact 16Ab, conversion switch 18
The first contact 18a of the time limit relay 20 and the first instantaneous contact 20a of the time limit relay 20 are both energized through the circuit.

Next, the time limit contact 20c of the time limit relay 20
As shown in the figure, it turns off after a certain time period. The time limit for turning off the time-limited contact 20c is set within the time until the next tap position 9a is reached and the changeover switch 18 changes from the first contact 18a to the second contact 18b. For example, in a tap changer that changes 5 seconds/1 tap, it depends on the on angle of the position switch 19A, but it is about 0.5~1.
It should be about seconds.

Next, by turning off the time limit contact 20c of the time limit relay 20, the first switching relay 16A is deenergized, and its first and second self-holding contacts 16Aa
and 16Ab open, interlock contact 16
Ac closes.

Here, the purpose of deenergizing the first switching relay 16A using the time-limiting contact 20c of the time-limiting relay 20 is that if it is not deenergized, the next tap position 9
Even if the transfer switch 18 switches from the first contact 18a to the second contact 18b when the switch 18 reaches the point A, the first transfer relay 16A is energized through its second self-holding contact 16Ab and the first instantaneous contact 20a of the time limit relay 20. As a result, the interlock contact 16Ac of the first switching relay 16A continues to turn off the energizing circuit of the second switching relay 17A.
7A is not energized and therefore the second self-holding contact 1
7Ab remains off, position switch 19A turns off halfway between tap positions 9a and 9b, and time limit relay 20 deenergizes, turning off its first instantaneous contact 20a.
0 energizing circuit is not formed anywhere, and it is possible to prevent the power supply of the drive motor from being turned off with the deenergization of the first electromagnetic contactor 10, and causing a stop in the middle of tap switching.

That is, the time limit relay 20 is energized and the
By turning off the time limit contact 20c after 1 second,
Since the first conversion relay 16A is deenergized, its first self-holding contact 16Aa and second self-holding contact 16Ab are turned off, and the interlock contact 16Ac is turned on, the energizing circuit of the second conversion relay 17A is prepared. , the first contact 1 of the conversion switch 18
8a to the second contact 18b, the second switching relay 17A is energized, and the first electromagnetic contactor 1
0 energizing circuit can be formed, and mid-way stoppage of switching can be prevented.

Next, when the switch 18 reaches the tap position 9a, it is driven by a power storage mechanism (not shown).
The first contact 18a is changed to the second contact 18b.

This conversion energizes the second conversion relay 17A, and its first and second self-holding contacts 17Aa, 17
Ab turns on and interlock contact 17Ac turns off. As a result, the first electromagnetic contactor 10 has the second self-holding contact 17Ab of the second conversion relay 17A,
It continues to be energized through the second contact 18b of the transfer switch 18 and the first instantaneous contact 20a of the time limit relay 20.

In the middle of tap positions 9a and 9b, position switch 19A is turned off. This results in
The time limit relay 20 is deenergized and its instantaneous contacts 20a,
20b is turned off, and time limit contact 20c is turned on.

Although the first momentary contact 20a of the time limit relay 20 is turned off, the first electromagnetic contactor 10 continues to be energized through the second self-holding contact 17Ab of the second transfer relay 17A and the second contact 18b of the transfer switch 18.

Next, when the tap position 9b is reached, the changeover switch 18 changes from the second contact 18b to the first contact 18a again.
This switching operation causes the first electromagnetic contactor 1 to
0 is deenergized and the power to the drive motor is turned off, resulting in a stop at tap position 9b.

In addition, the second instantaneous contact 20b of the time relay 20
Even if the first push button switch 14 is kept pressed, when the switch 18 reaches the tap position 9a and switches from the first contact 18a to the second contact 18b, the second switch relay 17A can be energized. It was established in

[Effect of idea]

As described above, according to this invention, a position switch that is turned on with a skip tap can be used in a skip tap control circuit that uses two electromagnetic relays, which are currently in use instead of a conversion relay that uses a mercury switch, which has a pollution problem. 1 time-limited relay energized by
Since the configuration is such that a simple and highly reliable skip tap control circuit can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a skip tap control circuit according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a conventional skip tap control circuit, and FIG. 3 is a circuit diagram showing a skip tap control circuit according to an embodiment of the present invention. FIG. 4 is a circuit diagram of the on-load tap switching device used in the conventional example and this embodiment, and FIG. 5 is an operation sequence diagram of each switch in the skip tap control circuit shown in FIG. FIG. 6, an operational diagram showing the switching order of the device, is a circuit diagram showing a conventional (currently used) tap control circuit. 10 is the first electromagnetic contactor, 11 is the second electromagnetic contactor, 16A is the first conversion relay, 16Aa, 16Ab
is a self-holding contact, 16Ac is an interlock contact,
17A is the second conversion relay, 17Aa and 17Ab are self-holding contacts, 17Ac is interlock contact, 1
8 is a changeover switch, 19A is a position switch, 20 is a time relay, 20a and 20b are instantaneous contacts, and 20c is a time contact. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of electromagnetic contactors for performing up-rotation and down-rotation operations of the drive motor of the on-load tap changer; A first transfer relay of electromagnetic type having a holding contact and an interlock contact, and a second transfer relay having a holding contact and an interlock contact.
a conversion relay, a conversion switch connected to the electromagnetic contactor and the conversion relay, and a time-limited relay connected in series with a position switch connected to the conversion switch and the electromagnetic contactor and turned on by a skip tap. The time-limited relay includes at least two components for controlling on/off of the electromagnetic contactor and the conversion relay.
A skip tap control circuit for a load tap switching device, characterized in that it is provided with two instantaneous contacts and one time-limited contact. (2) A utility model registration request characterized in that one of two instantaneous contacts is connected to a transfer switch, the other to an electromagnetic contactor, and one time-limited contact is connected in series to one transfer relay. Range 1
Skipping tap control circuit for the on-load tap switching device described in 2.