JP3651033B2 - Electric control circuit for tap switching device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an electric control circuit for a tap switching device for a transformer.
[0002]
[Prior art]
Conventionally, a control circuit for a driving motor of a transformer tap switching device will be described with reference to FIG.
[0003]
Reference numeral 1 denotes a tap switching motor that switches a tap of a transformer or the like to a descending or ascending direction via a speed reducer or the like. A series circuit of a lower limit switch 4L ₂ and a contact 5L _a4 of a descending electromagnetic contactor 5L, and an upper limit A series circuit of the switch 4R ₂ and the contact 5R _a4 of the ascending electromagnetic contactor 5R is connected so as to switch the rotation direction of the motor, and a three-phase AC power source is connected via the manually operated interlock switch 3 and the wiring breaker 2. Connected to AC. In the figure, subscripts of symbols, for example, a1 and a2 are first a contact and second a contact of an electromagnetic contactor , and b1 and b2 are first b contact and second b contact. Indicates.
[0004]
Lowering electromagnetic contactor (coil) 5L is lowered push button switch 7L _a series circuit of a rising push button switch 7R _b and self contacts 5L _a1 and stepping electromagnetic contactor in series with the parallel circuit A ₁ of 6 a circuit a connected to the contacts 6 _b1 and lower limit switch 4L ₁ of the parallel circuit of the series circuit B of the control cam switch 8 ₁ self contacts 5L _a2 (a, B) an electromagnetic contactor 5R ascending series It is connected to the power supply via the contacts 5R _b.
[0005]
Similarly, the ascending electromagnetic contactor (coil) 5R includes a parallel circuit A ₁ composed of a series circuit of a raising push button switch 7R _a and a descending push button switch 7L _b and a self-contact 5R _a1.
And 'circuit A connected to the contacts 6 _b2 and upper limit switches 4R ₁ of increment electromagnetic contactor 6 in series', a parallel circuit of a series circuit B' of the control cam switch ₈₂ and the self-contact 5R _a2 ( a ', B') and via the contact 5L _b descending electromagnetic contactor 5L in series are connected to a power supply.
[0006]
Also, increment electromagnetic contactor (coil) 6 is an electromagnetic contactor connected in parallel with the control cam switch 8 ₃ 5L, a series circuit C the contacts 5L _a3, 5R _a3 of 5R, the parallel circuit A ₁ and a series circuit D of self contact 6 _a1, parallel circuit of a 'series circuit D between the self contacts 6 _a2' the parallel circuit a (C, D, D ') are connected in series, are connected to a power source ing.
[0007]
Then, descending and ascending external commands are input to connection points between the parallel circuits A ₁ and A ₁ ′ and the magnetic contactor contacts 6 _a1 , 6 _b1 and 6 _a2 , 6 _b2 , respectively. The cam switches 8 ₁ to 8 ₃ are turned on in the range shown in FIG. 5 during one step of lowering or rising. Since the operation process is the same for both the descending side and the ascending side of the above circuit, the operation of the descending side circuit will be described below with reference to FIG.
[0008]
First, the lowering push button switch 7L (7L _a , 7L _b ) is pressed to turn on the switch 7L _a and turn off 7L _b . When the switch 7L _a is turned on, the descending electromagnetic contactor 5L is excited and operates through the circuit A, and is self-held when the contact 5L _a1 is turned on. Thereby, even if the push button switch 7L is opened in a short time, the electromagnetic contactor 5L continues to operate (FIGS. 3A and 3B).
[0009]
When the contact 5L _a4 of the electromagnetic contactor 5L is turned on, the electric motor 1 rotates, and a tap switching device (not shown) is driven in the downward direction. After the start of driving, the control cam switch 8 ₁ is closed (FIGS. 3C and 3D), and the electromagnetic contactor 5L is excited through the cam switch 8 ₁ and the electromagnetic contactor contact 5L _a2 in addition to the self-holding circuit. A circuit is formed.
[0010]
Then the control cam switch 8 ₃ is turned on shortly, stepping electromagnetic contactor 6 is energized through the electromagnetic contactor contacts 5L _a3, operates (solid line in FIG. 3 (e), (f) ). Since this operation its contacts 6 _b1 is turned off (the solid line in FIG. 3 (g)), the self-holding circuit is open, operation of the electromagnetic contactor 5L by a cam switch ₈₁ side circuit B is continued.
[0011]
Motor 1 continues to rotate, cam switch 8 ₁ are turned off to complete the operation of one tap just before the predetermined stop position. Consequently it solved the excitation of the electromagnetic contactor 5L, contact L _a1 ~L _a4, L _b is returned to all the state shown. When the contact _La4 is turned off, the excitation of the electric motor 1 is released, the rotation is stopped, and the tap switching operation is completed.
[0012]
Even if an external command for lowering is input instead of the operation of the pushbutton switch for lowering, the same operation as described above is performed.
[0013]
On the ascending side, 4L is changed to 4R, 5L is changed to 5R, 7L is changed to 7R, and 8 _{1 is changed} to 8 ₂ .
[0014]
[Problems to be solved by the invention]
The control circuit shown in FIG. 4 uses three cam switches 8 ₁ to 8 ₃ as control cam switches. Therefore, there are the following problems.
[0015]
(1) The cam switch mounting structure is complicated.
[0016]
(2) It takes effort to adjust the operation timing between the cam switches.
[0017]
(3) The control circuit becomes complicated.
[0018]
The present invention has been made in view of such problems of the prior art, and the object of the present invention is to satisfy a single control cam switch for tapping, tapping, and stepping. An object of the present invention is to provide an electric control circuit for a switching device that can perform a switching operation.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the electric control circuit of the tap switching device according to the present invention includes lowering and raising electromagnetic contactors 5L and 5R for rotating the driving motor 1 in the tap lowering direction and the upper direction, and a control cam switch 8 ₄ by controlled lowering or increasing electromagnetic contactor 5L, taps and a stepping electromagnetic contactor 6 to stop in one step the position of releasing the operation of the 5R lowering or raising the electric drive motor 1 An electric control circuit for a switching device,
Lowering push button switch 7L _a , ascending push button switch 7R _b , contact 6 _b1 for stepping electromagnetic contactor 6 , lower limit switch 4L ₁ , contact 5R _b for raising electromagnetic contactor 5 R , lowering electromagnetic contactor A circuit for operating a descending electromagnetic contactor 5L composed of a 5L series circuit;
Self-holding of the lowering electromagnetic contactor 5L consisting contacts 5L _a1 descending push button switch 7L _a a raised push button switch 7R _b connected in parallel to have been lowered electromagnetic contactor 5L connected to the series Circuit,
Raised push button switch 7R _a, lowering push button switch 7L _b, the contacts 6 _b2 of stepping electromagnetic contactor 6, the upper limit switch 4R _1, an electromagnetic contactor for rise and contacts 5L _b descending electromagnetic contactor 5L a circuit for operating the elevating electromagnetic contactor 5R comprising a series circuit of 5R,
Self-holding circuit of the rise electromagnetic contactor 5R consisting contact 5R _a1 increase electromagnetic contactor connected in parallel with lowering push button switch 7L _b with increased push button switch 7R _a connected to the series When,
The control cam switch 8 ₄ , the electromagnetic contacts for stepping composed of series circuits of the contact points 5L _a3 , 5R _{a3 of} the descending and rising electromagnetic contactors 5L, 5R connected in parallel and the stepping electromagnetic contactor 6 Device drive circuit,
Lowering said lowering electromagnetic contactor and the control cam switch 8 ₄ connected in parallel with the circuit of 5L from lowering push button switch 7L _a which are connected in series in the circuit for operating the up to lower limit switch 4L ₁ a circuit for use electromagnetic contactor 5L said control cam switch 8 ₄ consisting of a series circuit of contacts 5L _a2 of to sustain the operation of the lowering electromagnetic contactor 5L until off,
Increases and the control cam switch 8 ₄ connected in parallel with the circuit from rise push button switch 7R _a which are connected in series in the circuit for operating the electromagnetic contactor 5R for the raised to the upper limit switch 4R ₁ a circuit to sustain the operation of the rising electromagnetic contactor 5R to use electromagnetic contactor 5R said control cam switch 8 ₄ consisting of a series circuit of contacts 5R _a2 of off
The a, is characterized in that so as to satisfy the tap switching operation at one of the control cam switch 8 _4.
[0020]
[Action]
When the descending or ascending pushbutton switch is turned on, the descending or ascending electromagnetic contactor is excited and self-held, and the drive motor is rotated in the tap descending or ascending direction by the contact. When the control cam switch is turned on due to the rotation, the stepping electromagnetic contactor is excited, and when the b contact is turned off, the self-holding is released. The descending or ascending electromagnetic contactor is energized. When the control cam switch is turned off, the excitation is released. For this reason, an electric motor stops in the state where one tap advanced. According to this circuit, it is possible to perform a tap switching operation with a single control cam switch, which conventionally required three.
[0021]
【Example】
An embodiment of the present invention will be described with reference to FIGS.
[0022]
FIG. 1 shows an electric control circuit of a tap switching device. In the figure, the same components as those shown in FIG. 4 are denoted by the same reference numerals, and redundant description thereof is omitted.
[0023]
8 ₄ control cam switches, operation timing has become like the cam switch _81, 82 in a conventional 4, instead the cam switch 8 ₃ in the conventional 4, an electromagnetic contactor of the parallel connector contacts 5L _a3 , 5R _a3 circuit C is connected in series. An operation sequence of the cam switch 8 ₄ in FIG.
[0024]
Further, the cam switches 8 ₁ and 8 ₂ connected in series with the magnetic contactor contacts 5L _a2 and 5R _a2 in FIG. 4 are not necessary, and the cam switch 8 ₄ and the contact 5L _a3 are connected to the contacts 5L _a2 and 5R _a2 . , 5R _a3 from the connection point. Other configurations are the same as those of the conventional FIG.
[0025]
Next, the operation of the descending circuit in this embodiment will be described with reference to the time chart of FIG. First, the lowering push button switch 7L ( 7L _a , 7L _b ) is pressed (FIG. 3A), thereby energizing the lowering electromagnetic contactor 5L via the circuit A, and the contacts 5L _{a1 to} 5L _a4 are connected. When the contact 5L _a1 is turned on, the electromagnetic contactor 5L is self-held (FIGS. 3B and 3C). The cam switch 8 ₄ motor 1 is rotated by turning on the contact 5L _a4 is turned (FIG. 3 (d)).
[0026]
Stepping electromagnetic contactor 6 is energized through the contacts 5L _a3 by turning on the cam switch 8 _4, the contact 6 _b1, 6 _b2 contacts off (FIG. 3 (f), the broken line (g)), contact 6 _a1 and _6a2 are turned on. When the contact _6b1 is turned off, the self-holding circuit is cut off, but the excitation of the magnetic contactor 5L is continued by the circuit B of the cam switch 8 ₄ and the contact 5L _a2 , and when the cam switch 8 ₄ is turned off, the excitation of the electromagnetic contactor 5L. Since the contacts 5L _{a1 to} 5L _a4 are turned off, the rotation of the electric motor 1 is stopped.
[0027]
The operation of the descending side circuit has been described above, but the explanation of the ascending side circuit will be omitted because it operates in the same manner.
[0028]
According to this embodiment, the operation timing of the stepping electromagnetic contactor 6 is slightly different from that of the conventional FIG. 4, but there is no problem in the operation of the circuit.
[0029]
According to this embodiment, only one cam switch is required, the mounting structure is simplified, the operation timing is easily adjusted, and the circuit is simplified.
[0030]
【The invention's effect】
According to the present invention, the operation timing of the stepping electromagnetic contactor is slightly different from that of the conventional one. However, in the present invention, only one cam switch for control is required. Therefore, since the number of parts of the cam switch can be reduced, mounting, assembly adjustment, and the like can be simplified. Further, by reducing the number of parts, there can be obtained an advantage that overall reliability can be improved.
[Brief description of the drawings]
FIG. 1 is a drive motor control circuit diagram according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a cam switch operation sequence in the embodiment.
FIG. 3 is a time chart for explaining the operation of the embodiment and the conventional example.
FIG. 4 is a drive motor control circuit diagram of a conventional example.
FIG. 5 is an explanatory diagram of a cam switch operation sequence in a conventional example.
[Explanation of symbols]
1 ... tap switching motor 2 ... breaker 3 ... manually operated wire interlock switch 4L _1, 4L ₂ ... lower limit switch 4R _1, 4R ₂ ... upper limit switch 5L ... lowering electromagnetic contactor (coil)
5R ... Ascending electromagnetic contactor (coil)
6 ... Stepping electromagnetic contactor (coil)
7L ₁ , 7L ₂ ... descending push button switch 7R ₁ , 7R ₂ ... ascending push button switch 8 ₁ to 8 ₄ ... control cam switch

Claims (1)

Lowering and rising electromagnetic contactor 5L to rotate the driving motor 1 to the tap decreasing direction and upward direction, 5R and the control cam switch 8 ₄ by controlled lowering or increasing electromagnetic contactor 5L, operation of 5R And a stepping electromagnetic contactor 6 for stopping the driving electric motor 1 at a one-step position of descending or ascending, and an electric control circuit of a tap switching device,
Lowering push button switch 7L _a , ascending push button switch 7R _b , contact 6 _b1 for stepping electromagnetic contactor 6 , lower limit switch 4L ₁ , contact 5R _b for raising electromagnetic contactor 5 R , lowering electromagnetic contactor A circuit for operating a descending electromagnetic contactor 5L composed of a 5L series circuit;
Self-holding of the lowering electromagnetic contactor 5L consisting contacts 5L _a1 descending push button switch 7L _a a raised push button switch 7R _b connected in parallel to have been lowered electromagnetic contactor 5L connected to the series Circuit,
Raised push button switch 7R _a, lowering push button switch 7L _b, the contacts 6 _b2 of stepping electromagnetic contactor 6, the upper limit switch 4R _1, an electromagnetic contactor for rise and contacts 5L _b descending electromagnetic contactor 5L A circuit for operating an electromagnetic contactor 5R for ascending consisting of a 5R series circuit;
Self-holding circuit of the rise electromagnetic contactor 5R consisting contact 5R _a1 increase electromagnetic contactor connected in parallel with lowering push button switch 7L _b with increased push button switch 7R _a connected to the series When,
The control cam switch 8 ₄ , the electromagnetic contacts for stepping composed of series circuits of the contact points 5L _a3 , 5R _{a3 of} the descending and rising electromagnetic contactors 5L, 5R connected in parallel and the stepping electromagnetic contactor 6 Device drive circuit,
Lowering said lowering electromagnetic contactor and the control cam switch 8 ₄ connected in parallel with the circuit of 5L from lowering push button switch 7L _a which are connected in series in the circuit for operating the up to lower limit switch 4L ₁ a circuit for use electromagnetic contactor 5L said control cam switch 8 ₄ consisting of a series circuit of contacts 5L _a2 of to sustain the operation of the lowering electromagnetic contactor 5L until off,
Increases and the control cam switch 8 ₄ connected in parallel with the circuit from rise push button switch 7R _a which are connected in series in the circuit for operating the electromagnetic contactor 5R for the raised to the upper limit switch 4R ₁ a use electromagnetic contactor 5R said control cam switch 8 ₄ consisting of a series circuit of contacts 5R _a2 of the circuit to sustain the operation of the rising electromagnetic contactor 5R until turned off, one of the control cam switch electric control circuit of the tap switching device which is characterized in that so as to satisfy the tap changing operation at 8 _4.

Images