EP2652759A1

EP2652759A1 - Additional motorized adjustment of the adjustment knob in remotely controllable electronics systems of industrial switchgear

Info

Publication number: EP2652759A1
Application number: EP11793821.7A
Authority: EP
Inventors: Thomas Freyermuth
Original assignee: Eaton Electrical IP GmbH and Co KG
Current assignee: Eaton Electrical IP GmbH and Co KG
Priority date: 2010-12-13
Filing date: 2011-12-13
Publication date: 2013-10-23
Also published as: WO2012080210A1; CN103348428B; CN103348428A; EP2463873A1

Abstract

The invention relates to electrical switchgear in which the switchgear parameters are adjusted by means of remote control and which additionally have apparatuses with which these parameter values can be read off directly from the switchgear. The invention also relates to a method for ensuring that currently set switchgear parameters and a parameter value display on the appliance itself correspond. Whereas the current setting value can be directly read off on the appliance by means of the arrow of the one slot (26) and the scale marking (30) when a switchgear parameter is adjusted by means of the adjustment knob (21) directly on the appliance, in the case of remote adjustment of this setting value in prior art appliances the set value may differ from the position of the adjustment knob (21) and therefore the position of the slot with the arrow (26) in relation the scale marking (30). The invention proposes that the current setting of a switchgear parameter can be read off from the appliance itself on the at least one apparatus for adjusting the at least one switchgear parameter. This can be done by the apparatus for adjusting the switchgear parameter having an adjustment motor for updating the parameter value display on the appliance itself, wherein, when a new setting value is remotely set, the existing position of the adjustment knob (21) and therefore the position of the slot with the arrow (26) is readjusted to the new value in relation to the scale marking (30). In the process, the PCB motor is actuated by the electronics system of the switchgear until the position of the adjustment potentiometer or of the adjustment switch corresponds to the new value.

Description

ADDITIONAL MOTORIZED ADJUSTMENT OF ADJUSTABLE KNOBS IN REMOTE ELECTRONICS OF INDUSTRIAL SWITCHES

The invention relates to electrical switching devices, in which the setting of

Switching device parameters can be made by remote control and additionally have devices with which these parameter values can be read directly on the switching device. Furthermore, the invention relates to a method for ensuring the consistency of currently set switching device parameters and a

Parameter value display on the device itself. In electrical switching devices, such. Circuit breakers, more and more individual functions are solved electronically. Thus, e.g. classic error or

Overcurrent release based on bimetals replaced by electronic circuits. Such switches are offered for example by the applicant under the product name NZMl to NZM4. The advantages of an electronic solution are the simple structure, the better adjustment options and, above all, with increased demand of the networkability of the individual components of a switchgear, the remote readability and control or

Adjustability via an electronic interface such as a bus system or a network.

In conventional switching devices, switching device parameters are transmitted directly to the switching device, e.g. adjusted via potentiometer or tap changer. Such switching devices are well known and available from many manufacturers. If such a switching device is combined with an electronic module with which these switching device parameters can be changed by remote adjustment, there may be differences between the actual setting of these parameters and the parameter values readable on the device itself.

In particular, circuit breakers increasingly have a communication interface via which the currently set device parameter values can also be overwritten. However, the values may only be changed in such a way that an unsafe condition is not possible, for example an overcurrent setting only with respect to those at the switching device itself readable values can be reduced. This ensures in the devices of the prior art that the switching device triggers in any case at the latest when reaching the readable on the device limit. The object of the invention is to provide an electrical switching device with the possibility of

Remote adjustment of at least one switchgear parameter and with an additional

Specify device for setting and reading these settings on the device itself, in which when changing a parameter substantially at the same time the parameter value displayed on the device itself displays the same value as the actual

Setting this parameter corresponds.

The object is achieved by a device according to claim 1. advantageous

Embodiments of the device will become apparent from the dependent claims 2 to 5. With a device according to the present invention, it is now possible that the respective switching device parameters can be set both on the device itself, so also by remote adjustment.

Furthermore, the invention is based on the object of specifying a method for ensuring the conformity of a currently set switching device parameter of a remotely adjustable electrical switching device with the display of the value of this parameter by means of a device for setting and displaying at least one switching device parameter on the device itself, which ensures essentially the same time the parameter value displayed on the device itself indicates the same value as the actual one

Setting this parameter corresponds.

According to the invention, this object is achieved by a method having the features of independent claim 6. The invention proposes to provide a servomotor to the device for setting and displaying the switchgear parameter on the device itself, which is controlled in the remote adjustment of the corresponding parameter value and nachzuführen the device accordingly, so that the currently set value is displayed. In this case, the switching device Of course, more than one device for setting and display of switchgear parameters have, of which one or more of these devices can be eifindungsgemäß equipped with a servomotor. Likewise, it is conceivable to track only one or more parameter displays on the device itself with several parameters that can be set remotely for a switching device. The invention relates to all possible combinations of

remotely adjustable and only on the device self-adjustable switchgear parameters and the tracking of these parameter values.

Under actuators are generally electrical rotary swivel or linear drives to understand. A servo motor can include a DC motor, an asynchronous motor or a synchronous motor, so actually any type of electric motor. The distinction to other engines is not in the engine itself, but solely in their control, which is operated in a closed loop. If one uses stepper motors, which in principle also include the PCB motors, then the adjustment always takes place in steps with a design-related step size. On the other hand, if other motors are used, then a control loop is required to approach and hold the desired shift position, which then corresponds to the design of a servomotor, the step size being selectable by appropriate control.

A servomotor has the advantage that, in contrast to, for example, a

Stepper can be switched in all directions and not just one direction. So you can, for example, arbitrarily back and forth or

turn back.

The servomotors according to the present invention are not directly with the

Adjustment of the parameters coupled, but only with the mechanical adjustment knobs. This means that as long as there is an adjustment of the mechanical setting buttons, the old value of the parameter applies and only after the adjustment (after a certain rest period, eg 1-2 seconds) the new parameter value is adopted. This is possible, for example, with an intermediate electronics. In an advantageous embodiment, the servomotor consists of a micro or nano motor. Since such motors are very small, their use is particularly suitable for switches with several parameters to be set, in which therefore several devices for

Adjustment and display of switchgear parameters on the device itself e.g. exist in the form of tap changers or potentiometers.

Particularly advantageous is the use of so-called PCB motors as

Actuators proved. These are piezomotors that can be integrated directly into a printed circuit board. In piezo motors of this kind, piezoelectric components which, upon application of a suitable electrical voltage, perform mechanical oscillations are coupled to a resonator, which in turn rests against a movable element. The resonator converts the oscillations of the piezoelectric component into preferably elliptical oscillations of the contact area of the resonator with a rotor. The movable member preferably moves in a first direction when a first voltage is applied to the piezoelectric device in a first direction, when a second voltage is applied at a second frequency to the piezoelectric device in a preferably opposite second direction. In this way, the tracking of the device for setting and displaying a

Switchgear parameters on the device are very accurate and cost-effective for the human ear noiselessly realized with very low energy consumption. It is particularly advantageous that such a PCB motor can perform the adjustment of the device for setting and displaying the switchgear parameter without an additional gear.

In a further advantageous embodiment, the connection of a PCB motor with the device for setting and displaying a switchgear parameter on the device itself is realized by means of a slip clutch.

Further advantages, features and expedient developments of the invention will become apparent from the dependent claims and the following description of preferred

Exemplary embodiments with reference to the figures.

From the pictures shows: Fig. 1 Top view of a front panel of an electric switch with Einstellfeld and button front

2 schematic diagram of a device for tracking a trim potentiometer or a switch for setting a switchgear parameter by means of a PCB

Motors on average

In Fig. 1, the front panel 10 is shown with the adjustment field for a switching device parameters of an electrical switching device. With the help of a screwdriver, which can be inserted into slots 25, 26 of the adjusting knob 21, the knob 21 can be rotated and thus values for a switchgear parameter can be changed. Such switching device parameters may be, for example, threshold values for overload or short-circuit current tripping. A slot 26 for receiving the screwdriver has an arrow at one end. The position of this arrow in relation to an applied on the front panel

Scale inscription 30 signals the setting value of the switchgear parameter in question.

Fig. 2 is a schematic diagram of a device for tracking a

Trim potentiometer or a switch for setting a switchgear parameter by means of a PCB motor in section. While when setting a switchgear parameter by means of the knob 21 directly on the device, the current setting is readable directly by means of the arrow of a slot 26 and the scale inscription 30 on the device, in a remote adjustment of this setting in devices of the prior art, the set value of the Position of the adjustment knob 21 and thus the position of the

Slit with arrow 26 in relation to the scale inscription 30 differ. In the

2, the existing position of the adjustment knob 21 and thus the position of the slot with arrow 26 in relation to the scale inscription 30 is readjusted to the new value at a remote setting of a new setting value.

The inventive device of FIG. 2 provides for tracking the adjustment knob 21 to the current scale value in addition to the circuit board for the switch parameter electronics 100, a further circuit board 40 for the motor plane before, on both sides with

electrical piezo elements 50, 60 is equipped. The piezoelectric elements 50 of a first, the front panel 10 of the switch facing side, act on a first rotor plate 22 on Adjustment knob 21 and serve the tracking of the adjustment knob 21 in a remote adjustment of the parameter value. The piezoelectric elements 60 of the second side facing away from the front panel 10 of the switch act on a setting of a trim potentiometer 80, which in turn is mounted on components on a further printed circuit board 100 for the

Switching device parameter electronics acts. In this case, the second rotor plate 70 has a mechanical interface 7 to the trimming potentiometer. The adjusting knob 21 is connected via retaining lugs 28 with the second rotor plate 70 so that both rotor plates 22, 70 are pressed against the electrical piezo elements. The knob 21 and the second rotor plate 70 together form the rotor of the motor. The piezo elements 50, 60 are firmly connected to the printed circuit board 40. To transmit power to the rotor plates 22, 70, the friction extends through the pressure force, by the

Holding lugs 28, the first rotor plate 22 and the second rotor plate 70 is generated from. To track the position of the adjusting knob 21 after remotely setting a new setting value, the PCB motor is driven by the electronics of the switching device 100 via a motor driver until the setting switch or the setting potentiometer 80 corresponds to the new value. This can then be read on site on the device. In manual operation, the adjustment knob 21 with a slightly higher force than would be necessary if no inventive device for tracking a

Trimmpotentiometers or a switch for setting a switchgear parameter would be operated by an operator. The rotor plates 22, 70 slide over the piezo elements 50, 60 away.

The described two-sided construction of the piezo motor can alternatively also be carried out on one side by omitting the piezo elements 60 or piezo elements 50. In this case, the pressure force of the corresponding rotor plate 70 or 22 must be ensured in other ways. This can be done for example by the provision of a spring to the front panel 10 or the circuit board 100 out. It should be noted that the size of the possible

Power transmission is at least halved. According to the adjustment knob 21 is also tracked in this case so that the readable scale value currently available through the

Remote setting set parameter value corresponds. Instead of a trim potentiometer, another suitable adjustment element, such as a tap changer, can be provided. It is also possible to integrate several PCB motors including control electronics on a printed circuit board. It is particularly advantageous that only one motor driver is required by the outputs are wired electrically switchable to the corresponding piezo elements of the individual motors. The tracking of the

In this case, parameter changes can take place one after the other by successively switching the corresponding motors to the one motor driver. In this case, it is ensured that the switching device, independently of the remotely set parameter value, responds at least to the value which can be read on the device itself, if this value is lower than the remotely set value. This can be achieved by setting the parameter value by remote control of the servomotor.

Reference number:

10 front panel

20 Device for setting and displaying the first switchgear parameter on

Device itself

21 adjustment knob

22 first runner plate

25 slot

26 slot with arrow

28 holding nose

30 scale label

40 circuit board for motor level

50 piezo element on the first side of the printed circuit board (40)

60 piezo element on the second side of the printed circuit board (40)

70 second runner plate

75 mechanical interface

80 trim potentiometers

100 circuit board for switch parameter electronics

Claims

claims:

1. Electrical switching device with an electronic module, wherein at least one first switching device parameter is remotely adjustable, comprising a device (20) for setting and displaying at least the first switching device parameter on the device itself, characterized in that the current setting of at least the first

Switching device parameter on the device (20) for setting and display of the first switching device parameter on the device itself is read.

2. Electrical switching device according to claim 1, characterized in that the

Device (20) for adjusting the first switching device parameter on the device itself has a servomotor for tracking the device (20) for setting and displaying the first switching device parameter on the device itself, so that even at

Remote adjustment of at least the first switching device parameter on the device (20) for setting and display of the first switching device parameter on the device itself, the current parameter value is read.

3. Electrical switching device according to claim 2, characterized in that the

Actuator for tracking the device (20) for setting and display of the first switching device parameter on the device itself is a PCB motor.

4. Electrical switching device according to claim 3, characterized in that the PCB motor is connected via a slip clutch to the device (20) for setting and displaying the first switching device parameter on the device itself.

5. Electrical switching device according to one or more of claims 2, 3 or 4,

characterized in that when the electrical switching device with a plurality of motors at most one motor driver is provided less than motors are present, and the outputs of at least one of these motor drivers are electrically switched to the corresponding piezo elements (50, 60) of several motors wired. A method for ensuring the compliance of at least one currently set first switchgear parameter of a remotely adjustable electrical switchgear with the display of the value of this first parameter by means of a device (20) for setting and displaying at least this first

Schaltgeräteparameters on the device itself, characterized in that at a change of at least the first switching device parameter by remote adjustment substantially simultaneously a servomotor for tracking the device for setting and display of this first switching device parameter on the device itself is controlled so that the current parameter value on the device (20 ) is displayed for setting and displaying at least this first switchgear parameter on the device itself.

A method according to claim 6, characterized in that at least in a change of at least the first switching device parameter by remote adjustment to a higher than the original value, the switching device responds to the readjustment of the reading on the device itself at the originally set value.

A method according to claim 6 or 7, characterized in that the

Parameter value setting on the device itself even with remote setting by the respective and driven by the actuator controlled by the remote control

Device (20) for setting and displaying the at least first

Switching device parameter happens.