Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
  • H02H3/006—Calibration or setting of parameters
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
  • H02H3/02—Details
  • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned

Definitions

• the invention relates to an electronic release, in particular for low-voltage circuit breakers, with setting and display elements for the tripping parameters to be set, such as for the tripping current in the event of overload and the associated delay time, the switching and display elements interacting with setting devices for the parameters and the setting and display elements are arranged on an operating front of the trigger.
• the triggers that work in analog form simulate a trip value, for example a trip current, as a rule by means of resistors and capacitors.
• the digital triggers contain a microprocessor with a permanently entered program and work in cycles, i.e. they check the level of current and the given requirements as part of a sequential sequence and decide whether to trigger or not and issue a corresponding one if necessary Release command. In both cases, the user must be able to use suitable setting elements to set whether or when to issue a trigger command.
• the trigger parameters are set in the previously known analog triggers with the aid of potentiometers, rotary coding switches or dip switches, which are accessible on the front of the trigger.
• coding switches which are arranged in the same way and, in some cases, of the same type, are used, which, by a combination of switching positions, define a corresponding switching shaft. All these 2 setting and coding switches, which are usually mechanical
• Fig. 1 of DE-OS 44 45 079 shows such a solution.
• the release unit which has a field on which the chip card is placed, can also be seen on the control panel with the actuating elements, the display and the hand lever for pulling on the spring accumulator. It contains the setting values for the release unit and is connected to it via contacts, as a result of which the values stored on the chip card are transmitted to the release unit. If the chip card is not inserted, the trigger is fixed to a basic setting with the lowest values that are suitable for the switch, so that no dangerous state can occur. This means that the switch is operated without the chip card with its minimum values. 3 Another proposal is to make the setting using a serial interface with which the
• Triggers can be equipped to transmit trigger values. However, this means that a notebook computer or other special handheld device must be used, this must be connected or plugged in and the display must be viewed. It is difficult to control the storage of the setting in the trigger, but at least it involves considerable effort, and an extra device is required, which must be connected for each setting and is also complicated and expensive.
• LCD elements are used in conjunction with a robust key control, the LCD elements serving as display elements for the respective parameters to be set and the key switches serving as setting elements.
• the setting of the trigger values and thus the control of the LCD display elements is preferably carried out using a single set of buttons, consisting of three buttons, with the following functions:
• button 3 is briefly connected to an auxiliary power source.
• This can be a battery or a capacitor, for example.
• the LCD displays can be designed as bar displays or as alphanumeric displays.
• a scale is arranged in addition to the LCD display, which can be of different levels in uniform steps. Then the bar of the LCD display can correspond to the 5 value of the parameter to be displayed have a different height, with its upper end on the scale indicating the value to be set or moving along the scale as a narrow line-like bar corresponding to the value to be displayed.
• the set value is displayed directly as a number.
• the first key is used to select the desired input field in a continuous sequence, that is, each time the key is pressed, the field below is selected after the one that has just been activated.
• the second key is used to set the triggering parameter of the selected field in such a way that each time the key is pressed the set value is increased in the specified increment or continuously.
• the grading can be rough or fine in the case of a bar display and fine or continuous in the case of alphanumeric display. If the highest value is reached, the display jumps to the lowest value the next time the button is pressed, and then increases again when the button is pressed again.
• the third button for activating the display fields is only pressed if the switch is not connected to the mains or is switched off, that is, if there is no voltage on the auxiliary release. Then an auxiliary supply for the adjusting device is switched on. Otherwise this facility is always active.
• the auxiliary supply can be a battery or a capacitor that keeps its charge for days when it is not under load and is able to handle electronic consumers with low current. 6 recordings of the order of microamperes to feed for hours.
• LCD elements which, regardless of whether they are alphanumeric or graphic displays
• the adjustable parameters of the tripping device are preferably divided into four groups: current-dependent delayed tripping, instantaneous tripping, short-term tripping and earth fault tripping with delay.
• the setting is based on a percentage of the current transformer nominal current, which in turn is determined by equipping the circuit breaker with certain current transformers. For this reason, this nominal transformer current is indicated on the operating front of the release. Since usually two part sizes are required for each parameter, namely the threshold value and the size of the desired delay, two setting options, according to the invention consequently two display fields, are provided in connection with a common set of setting buttons.
• FIG. 1 shows schematically an operating front of an electronic release according to the invention with a bar LCD display.
• FIG. 2 shows schematically an operating front of an electronic release according to the invention with an alphanumeric LCD display.
• FIG. 3 shows another embodiment of a bar LCD display.
• FIG. 4 shows a block diagram of a one-part device according to the invention.
• the operating front 1 of an electronic release shown in FIG. 1 has eight LCD displays 2 to 9, which are designed as bar LCD displays.
• the bar displays are designed so that in each display a narrow bar 10 moves for each parameter along a scale 11 present in each display.
• the bar display can also be designed such that the bar 12 can have a different height in the LCD display 2 to 9, depending on the size of the parameter to be set and thus displayed, in which case it is expedient the upper edge 13 of the bar 12 on the scale 11 arranged next to the LCD display 2 to 9 shows this value.
• the adjustable parameters of the trip unit are divided into four groups, for example: long-term tripping, instantaneous tripping, short-term tripping and earth fault tripping with delay.
• the setting is based on a percentage of the current transformer nominal current, which in turn is determined by the configuration of the
• the LCD display 5a % of I r
• the LCD display 6a the code number for multiples of I n
• the LCD display 7a delay is switched off
• the LCD display 8a the code letter for% of I n in the event of an earth fault
• the LCD display 9a the delay in ms.
• the display that follows is selected after the one that has just been activated.
• the second parameter 15 is used to set the triggering parameter in the selected LCD display 2 to 9a in such a way that each time the key 15 is pressed, the setting value is increased in the specified increment or continuously.
• the grading can be rough or fine in the case of a bar display and fine or continuous in the case of alphanumeric display. If the highest value is reached, the LCD display 2 to 9a jumps back to the lowest value the next time the button 15 is pressed, in order to rise again when the button is pressed again.
• the third button 16 for activating the LCD displays 2 to 9a is only pressed when the switch is not connected to the mains or is switched off, that is to say when there is no voltage at the auxiliary release. Then an auxiliary supply for the adjusting device is switched on. Otherwise this facility is always active.
• the auxiliary supply can be a battery or a capacitor that keeps its charge for days when it is not under load and is able to supply electronic consumers with low current consumption on the order of microamps for hours. It is also possible to use LCD elements, regardless of whether they are alphanumeric or graphic displays, which continuously present the information to be displayed without the use of energy after the information has been supplied to the display. This enables a further reduction in the energy requirement because the control energy which has to be provided when the auxiliary release is set in the currentless state is only applied for a short time 10 must be. Such LCD elements are offered by Kent.
• LCD display elements have by far the lowest power consumption and thus offer the possibility of making these settings even when the switches are switched off using a simple, cheaply available auxiliary power source.
• LCD elements regardless of whether they are alphanumeric or graphic displays, which continuously present the information to be displayed without energy supply after the information has been supplied to the display. This enables a further reduction in the energy requirement because the control energy which has to be provided when the auxiliary release is set in the currentless state only has to be applied for a short time.

Landscapes

• Liquid Crystal (AREA)
• Liquid Crystal Display Device Control (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7861451

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (4)

Citations (2)

Family Cites Families (5)

• 1998
  • 1998-03-13 DE DE1998111956 patent/DE19811956A1/de not_active Withdrawn
• 1999
  • 1999-03-12 WO PCT/DE1999/000815 patent/WO1999046841A1/de not_active Ceased
  • 1999-03-12 JP JP2000536122A patent/JP2002507108A/ja active Pending
  • 1999-03-12 EP EP99924656A patent/EP1062714A1/de not_active Ceased

Patent Citations (2)

Also Published As

Similar Documents

Legal Events