Adapter device

Abstract

The invention relates to an adapter device (10) for transmitting positions of an on-load tap changer (1) from a control device (6) to a secondary device (50), comprising: an input (20) for receiving at least one position from the control device (6) of the on-load tap changer (1); - an output (30) to which the position of the on-load tap changer (1) is output; and - at least one resistor (22) and at least one switch (24) which are connected in parallel; wherein: - depending on the position of the on-load tap changer (1), the at least one switch (24) is actuated by the control device (6) and the at least one resistor (22) is switched on or switched off; and - the output position of the on-load tap changer (1) at the output (30) corresponds to the resistance value of the at least one resistor (22) which has been switched on or switched off.

Description

[0001] The invention relates to an adapter device for transmitting positions of an on-load tap-changer from a control device to a secondary device.

[0002] On-load tap-changers are well known in the art and usually have a diverter switch and a selector. The on-load tap-changer is usually operated via a drive that is located on the outside of the tank of a tapped transformer. The drive has a motor that is coupled to the on-load tap-changer via a gearbox. Among other things, the position of the tap-changer is recorded via the gearbox by coupling an indicator gear with a display to it. The display also provides an interface that allows the position of the on-load tap-changer to be recorded and displayed in a control room. Due to the replacement of old drives with modern drive systems in the form of servo drives, there is no longer a display with an indicator gear and therefore no interface with which it is possible to record the position of the on-load tap-changer in the modern drive system using the available resources.Secondary technology must be recorded in the control room.

[0003] Document WO 01 / 92978 A1 discloses a device for transmitting positions of an on-load tap-changer from a control device to a secondary device, comprising: an input for receiving at least one position from the control device of the on-load tap-changer; - an output for outputting the position of the on-load tap-changer to the secondary device; - at least one first resistor and at least one first switch connected in parallel to one another; - a plurality of further resistors; - a plurality of further switches; where: - one switch is connected in parallel to a respective resistor; - all resistors are connected in series and form a first row of resistors; - all switches are connected in series and form a first row of switches; - depending on the position of the on-load tap-changer, at least one switch is actuated by the control device and the at least one resistor is switched on or off; - the output position of the on-load tap-changer at the output corresponds to the resistance value of the resistor or resistors that were switched on or off.

[0004] The object of the invention is therefore to create an adapter device which is simple and compact in design and yet ensures safe operation.

[0005] This object is achieved with an adapter device according to claim 1. The features of the subclaims constitute advantageous developments of the invention.

[0006] The invention proposes an adapter device for transmitting positions of an on-load tap-changer from a control device to a secondary device, according to claim 1.

[0007] The adapter device enables modern on-load tap-changer drives to be connected to existing secondary devices, so that the current position of the on-load tap-changer can be output via existing displays or similar devices. Especially when replacing on-load tap-changers and drives in existing systems, existing secondary devices can continue to be used and do not need to be replaced. Existing secondary devices, which are designed, for example, as displays or voltage regulators, always require a resistance value during operation, which is output by applying a voltage. However, modern on-load tap-changer control devices cannot have a resistor installed for each position to be represented in order to be able to represent the corresponding position.Furthermore, modern secondary devices exist that do not require a resistance value to represent a position and can be connected directly to the control devices. Resistors, which would then be built into the control device, are then unnecessary.

[0008] The positions of the on-load tap-changer are received at the input of the adapter device. The positions are transmitted or transferred from the control device via cable. At the output, the received positions are then output to a secondary device in the form of resistance values. At least one resistor and at least one switch are arranged inside the adapter device. The switch is actuated based on the received position, which is output by the control device. The switch is connected to the terminals. By actuating the switch, which is connected in parallel to the resistor, the resistor is switched on or off. By applying a voltage to the output, the switched-on or switched-off resistance value can be determined, which in turn is assigned a position in the secondary device. The resistor is connected to the output.

[0009] The adapter device has several resistors connected in series. The resistors form a first resistor row and a second resistor row. Each resistor can consist of one resistor element or several resistor elements connected in series or parallel.

[0010] The adapter device has several switches connected in series, forming a first switch row and a second switch row.

[0011] The switches can be designed as relays, bistable relays, or semiconductor switching elements. The use of bistable relays as switches is particularly advantageous. These have the advantage that in the event of an unintentional power failure, the bistable relay, and thus the switch, remains in the state in which it was last switched. Conventional relays would default to a state intended for them in the absence of power.

[0012] The adapter device is configured such that at least one switch is connected in parallel with the resistor. In an embodiment with multiple switches and multiple resistors, each resistor is assigned a switch. Each switch is connected in parallel with a resistor. By opening and closing the switches, the individual resistors are connected in series or removed from the series circuit. The individual resistors can either always have the same resistance value or have different resistance values.

[0013] According to the invention, with different resistance values ​​it is possible, for example, for the first resistor to have 10 ohms, the second resistor to have 20 ohms, the third resistor to have 40 ohms, the fourth resistor to have 80 ohms, the fifth resistor to have 160 ohms and the sixth resistor to have 320 ohms. These six resistors then form a first series of resistors. A second series of resistors can be constructed identically. Because each resistor is assigned a switch, 64 resistance values ​​can be set by operating the corresponding switches, thus outputting 64 positions of the on-load tap changer. This is also possible with other resistance values, as long as, according to the invention, a resistance value doubles from the first resistance value. A first resistance value can be 10 ohms, 40.3 ohms, 150 ohms or 400 ohms.

[0014] The input of the adapter device can be configured in any desired manner and, for example, have at least one terminal. Preferably, the at least one terminal is assigned to a switch. According to a further embodiment, the input has several terminals, each of which is connected to and actuates a switch. The control device has a digital interface. This is connected to the input and, in particular, the terminals via at least one cable. The control device transmits via the cable and the terminals which of the switches must be actuated in order to switch corresponding resistors on or off, so that resistance values ​​are then generated that are assigned to positions in the secondary device.

[0015] The output of the adapter device can be configured in any desired manner and, for example, have a first contact, a second contact, and a third contact. By applying a first voltage between the first and second contacts, a resistance value is determined that depends on which resistor(s) are connected or disconnected. Each resistance value corresponds to a position of the on-load tap-changer or is assigned to a position of the on-load tap-changer.

[0016] The adapter device can be designed in any way, whereby the first resistor series and the first switch series are connected at their first end to the first contact of the output and at their second end to the second contact of the output.

[0017] The first row of resistors and the first row of switches are connected in parallel, with one switch connected in parallel with each resistor.

[0018] The adapter device can be designed in any way, whereby a second row of switches and a second row of resistors are provided; the second row of switches is made up of several switches connected in series; the second row of resistors is made up of several resistors connected in series; the switches are each connected in parallel to one of the resistors.

[0019] The adapter device can be designed in any way, whereby the first resistor row and the first switch row connected in parallel are connected in series with the second resistor row and the switch row connected in parallel.

[0020] The adapter device can be designed in any way, whereby the second series of resistors and the series of switches connected in parallel are connected on the one hand to the second end of the output and on the other hand to a third end of the output.

[0021] The adapter device can be designed in any way, whereby When a first voltage is applied to the first and second terminals, a first resistance value can be determined which depends on the resistors switched on or off.

[0022] The adapter device can be designed in any way, whereby When a first voltage is applied to the first and second contacts or to the second and third contacts, a first resistance value can be determined which depends on the resistors in the first or second series of resistors that are switched on or off; When a second voltage is applied to the first and third contacts, a second resistance value can be determined which depends on the resistors in the first and second series of resistors that are switched on or off, the first voltage is a reference voltage and the second voltage is a supply voltage.

[0023] By using two resistor rows, which can be energized across three contacts, it is possible to represent the entire control range—that is, all the positions that can be reached—and the current position within this control range. However, for this to happen, the total resistance—the sum of the first and second resistor rows—must always remain the same. To achieve this, the control device switches on corresponding resistors in the first resistor row and switches off corresponding resistors in the second resistor row.

[0024] The adapter device can be designed in any desired way and, for example, have a first row of resistors and a second row of resistors. Each row of resistors has exactly six resistors. The first resistor in the first row of resistors has a specific resistance value. The second resistance value of the second resistor is twice that of the first resistor. The third resistor is twice the size of the second resistor, the fourth resistor is twice the size of the third resistor, the fifth resistor is twice the size of the fourth resistor, and the sixth resistor is twice the size of the fifth resistor. The first row of resistors and the second row of resistors are identically constructed. The adapter device also has a first row of switches and a second row of switches. The rows of switches are identically constructed.Each switch row has exactly six switches, each of which is a bistable relay.

[0025] Furthermore, an arrangement is provided that includes the adapter device, the on-load tap-changer, and the control device. The control device and the motor form the drive. This arrangement enables on-load tap-changers with modern drives to be connected to existing secondary devices, so that the current position of the on-load tap-changer can be output via existing displays or similar. Especially when replacing the on-load tap-changers and drives in existing systems, existing secondary devices can continue to be used and do not need to be replaced. Existing secondary devices, which are designed, for example, as displays or voltage regulators, always require a resistance value during operation, which is output by applying a voltage.However, modern control devices for on-load tap-changers cannot have a resistor installed for each position to be mapped, thus enabling the corresponding position to be mapped. Furthermore, modern secondary devices exist that do not require a resistance value to map a position and can be connected directly to the control devices. Resistors, which would then be installed in the control device, are then unnecessary.

[0026] The invention and its advantages are described in more detail below with reference to the accompanying drawings. They show: Figure 1 shows an on-load tap-changer with an adapter device; Figure 2 shows a first embodiment of the adapter device; Figure 3 shows a second embodiment of the adapter device.

[0027] Figure 1shows an on-load tap-changer 1 with a load diverter switch 2 and a selector 3. The on-load tap-changer 1 is operated by a motor 5. The motor 5 is connected to a control device 6. The control device 6 comprises a power section 7, a converter 8 and a control unit 9. The control device 6 detects, among other things, the position of the on-load tap-changer 1. The position of the on-load tap-changer 1 describes which winding tap of a regulating winding in a tapped transformer is currently being contacted. The motor 5 and the control device 6 form the drive 4. The control device 6 has a first interface 11 via which the position of the on-load tap-changer 1 is output. The first interface 11 is designed, for example, as a plug with terminals. The first interface 11 is a digital interface that outputs a digital signal that transmits the position of the on-load tap-changer 1.

[0028] The first interface 11 is connected via cable to an input 20 of the adapter device 10. The adapter device 10 has an output 30, which in turn is connected via cable to a second interface 12 of a secondary device 50. The secondary device 50 can be designed as a display, a voltage regulator, an evaluation unit, or the like.

[0029] Furthermore, an arrangement 100 is depicted. This comprises the adapter device 10 and / or the control device 6 and / or the motor 5 and / or the drive 4 and / or the on-load tap-changer 1. Preferably, the arrangement 100 comprises the adapter device 10, the control device 6 of the drive 4, and the on-load tap-changer 1. The arrangement 100 is connected to the secondary device 50 by means of the adapter device 10.

[0030] Figure 2shows a first embodiment of the adapter device 10 according to the invention. The input 20 of the adapter device consists of a plurality of terminals 21. At the input 20, and in particular via the terminals 21, the positions of the on-load tap-changer 1, which are output by the control device 6, are received. Furthermore, a plurality of series-connected resistors 22 are arranged inside the adapter device 10. These form a first resistor series 23. A switch 24 is arranged or connected in parallel to each resistor 22. Each resistor 22 can consist of or be constructed from a single resistor or a plurality of resistors connected in series or in parallel.

[0031] The plurality of switches 24 are also connected in series and form a first switch row 25. By opening and closing the corresponding switches 24, the corresponding resistors 22 are removed from the series circuit or added to it. As shown in Figure 2 As shown, it is therefore possible to use the switches 24 to connect all of the resistors 22 in series, to connect only some of the resistors 22 in series, or to connect none of the resistors 22 in series.

[0032] The actuation or control of the switches 24 is carried out via the respective terminals 21 of the input 20 by the control device 6. Depending on the position of the on-load tap-changer 1, corresponding switches 24 are actuated by the control device 6 and thus corresponding resistors 22 are connected in series.

[0033] If the control device 6 signals a position of the on-load tap-changer 1, the corresponding switch 24 or switches 24 are opened or closed via the corresponding terminal 21 or terminals 21. The adapter device 10 thus converts digital signals at the outputs of a control device 6 into corresponding resistance values ​​in the adapter device 10.

[0034] The first resistor row 23 and the first switch row 25 are connected at their ends to a first end 28 and a second end 29 arranged opposite the first end 28.

[0035] The first end 28 and the second end 29, located opposite the first end 28, of the resistor series 23 and the switch series 25 are connected to the output 30 of the adapter device 10. In particular, the first end 28 is connected to a first contact 31 and the second end 29 is connected to a second contact 32.

[0036] By applying a first voltage to the first and second contacts 31, 32, a current is established that changes due to the connected or disconnected resistors 22. The first resistance value is processed or displayed by a secondary device 50, which can be connected to the output 30 of the adapter device 10. The secondary device 50 can be configured as a display, voltage regulator, or the like. When the secondary device 50 is configured as a display, the corresponding positions of the on-load tap-changer 1 are assigned to the resistance values ​​and then displayed, for example, by pointers.

[0037] According to the invention, resistors 22 with different resistance values ​​can be connected in series. In such an embodiment, the resistance value doubles from left to right, in particular from 10 ohms, 20 ohms, 40 ohms, 80 ohms, 160 ohms, and 320 ohms. By cleverly connecting resistors 22 in series, 64 resistance values ​​can be generated at output 30, which then correspond to 64 positions of an on-load tap changer 1.

[0038] According to the invention, any resistance value can be used as the first value and must then be doubled.

[0039] Figure 3shows a further embodiment of the adapter device 10, but with a reference function. Here, a second resistor row 26 is connected in series with the first resistor row 23. A second switch row 27 is connected in series with the first switch row 25. The resistor rows 23, 26 and the switch rows 25, 27 are constructed identically. The series-connected resistors 22 of the first resistor row 23 have the same resistance values ​​as the series-connected resistors 22 of the second resistor row 26. The number of switches 24 in the first switch row 25 corresponds to the number of switches 24 in the second switch row 27.

[0040] At the third end 34 of the second resistor series 26, a third contact 33 is arranged, which is also part of the output 30. The third end 34 is arranged opposite the first end 28. The second contact 32 is connected between the first and second resistor series 23, 26 and the first and second switch series 25, 27. During operation, a constant second voltage (supply voltage) is applied to the first and third contacts 31, 33, so that a current is established which depends on the resistors 22 in the resistor series 23, 26 switched on or off by the switches 24. The respective first voltage (reference voltage) can then be applied to the first and second contacts 31, 32, or alternatively to the second and third contacts 32, 33, and a current (reference current) can then be measured.The sum of the two voltages, i.e., the voltages between the first and second contacts 31, 32 and the second and third contacts 32, 33, must always be equal to the second voltage (supply voltage) between the first and third contacts 31, 33. However, this requires that the total resistance, or the second resistance value, between the first and third contacts 31, 33 always remains the same. To achieve this, when a position of on-load tap-changer 1 is output, a switch 24 in the first switch row 25 and a switch in the second switch row 27 are actuated. This switches on a resistor 22 in the first resistor row 23 and switches off a corresponding resistor 22 in the second resistor row 26. This changes both the first voltage (reference voltage) between the first and second contacts 31, 32 and the first voltage (reference voltage) between the second and third contacts 32, 33.The second voltage (supply voltage) between the first contact 31 and the third contact 33 remains constant. As mentioned, the sum of both resistor series must always remain the same. If no resistor 22 is connected in the first resistor series 23, all resistors 22 in the second resistor series 23 are connected. The corresponding switches 24 are actuated via the control device 6.

[0041] The embodiment with three contacts 31, 32, 33 is primarily intended for secondary devices 50 that use the total resistance, i.e. the second resistance value, to display the entire control range, i.e., all positions of an on-load tap-changer 1, from the first to the last position. This applies, for example, to secondary devices 50 that are designed as displays. Here, the second voltage (supply voltage) or the second resistance value or total resistance is used as the basis for displaying an entire control range. In other words, all positions of an on-load tap-changer 1 are displayed. The first voltage (reference voltage) is then used to display the current position across the entire control range of the on-load tap-changer 1.

[0042] The switches 24 can be designed as relays, bistable relays or semiconductor switching elements.

[0043] The resistors 22 can be configured as multiples of 10 ohms, 40.3 ohms, 150 ohms, and 400 ohms, etc. Furthermore, the resistors for a resistance value can be constructed from several elements connected in series or parallel. List of reference symbols

[0044] 1 On-load tap-changer 2 Load transfer switch 3 Selector 4 Drive 5 Motor 6 Control device 7 Power section 8 Converter 9 Control unit 10 Adapter device 11 First interface 12 Second interface 20 Input 21 Terminal 22 Resistor 23 First resistor row 24 Switch 25 First switch row 26 Second resistor row 27 Second switch row 28 First end 29 Second end 30 Output 31 First contact 32 Second contact 33 Third contact 34 Third end 50 Secondary device 100 Arrangement

Claims

1. An adapter device (10) for transmitting positions of an on-load tap-changer (1) from a control device (6) to a secondary device (50), comprising: - an input (20) for receiving at least one position from the control device (6) of the on-load tap-changer (1); - an output (30) for outputting the position of the on-load tap-changer (1) to the secondary device (50); - at least one first resistor (22) and at least one first switch (24), which are connected in parallel with one another - a plurality of further resistors (22); - a plurality of further switches (24); wherein: - in each case one switch (24) is connected in parallel with in each case one resistor (22); - all resistors (22) are connected in series and form a first resistor series (23); - all switches (24) are connected in series and form a first switch series (25); - the resistance values of the resistors (22) are doubled starting from a resistance value of the first resistor (22); - depending on the position of the on-load tap-changer (1), at least one switch (24) is actuated by the control device (6) and the at least one resistor (22) is moved to the open or closed position; - the output position of the on-load tap-changer (1) at the output (30) corresponds to the resistance value of the resistor (22) or resistors (22) which was switched on or moved to the open position.

2. Adapter device (10) according to claim 1, wherein - the input (20) comprises at least one terminal (21); - each terminal (21) is coupled to at least one switch (24) or is assigned to a switch (24); - the control device (6) actuates the corresponding switches (24) via the terminals (21).

3. The adapter device (10) according to any one of claims 1 to 2, wherein - the output (30) comprises a first and a second contact (31, 32); - by applying a first voltage between the first and second contacts (31, 32), a resistance value is determined which depends on which resistor (22) is switched on or off or which resistors (22) are switched on or off; - wherein each resistance value corresponds to a position of the on-load tap-changer (1) or is assigned to a position of the on-load tap-changer (1).

4. The adapter device (10) according to any one of claims 1 to 3, wherein - the first resistor row (23) and the first switch row (25) is connected at its first end (28) to the first contact (31) and at its second end (29) to the second contact (29).

5. Adapter device (10) according to any one of claims 1 to 4, wherein - a second switch row (27) and a second resistor row (26) are provided; - the second switch row (27) is composed of a plurality of switches (24) connected in series; - the second resistor series (26) is made up of several resistors (22) connected in series; - the switches (24) are each connected in parallel with one of the resistors (22).

6. Adapter device (10) according to one of claims 1 - 5, wherein - the first resistor series (23) and the first switch series (24) connected in parallel thereto are connected in series with the second resistor series (26) and the switch series (27) connected in parallel thereto.

7. Adapter device (10) according to any one of claims 1 - 6, wherein - the second resistor row (26) and the second switch row (27) connected in parallel thereto are connected on the one hand to the second end (32) and on the other hand to a third end (33).

8. Adapter device (10) according to any one of claims 1 - 7, wherein - the output (30) has a third contact (33) which is connected to a third end (33).

9. The adapter device (10) according to any one of claims 1 - 8, wherein - when a first voltage is applied to the first and second terminals (31, 32), a first resistance value can be determined which depends on the connected and disconnected resistors (22), respectively.

10. Adapter device (10) according to one of claims 1 - 9, wherein - when a first voltage is applied to the first and the second contact (31, 32) or to the second and the third contact (32, 33), a first resistance value can be determined which depends on the connected or disconnected resistors (22) in the first or second resistor series (23, 26); - when a second voltage is applied to the first and third contacts (31, 33), a second resistance value can be determined, which depends on the connected or disconnected resistors (22) in the first and second resistor series (23, 26), - the first voltage is a reference voltage and the second voltage is a supply voltage.

11. Arrangement (100) comprising - an adapter device (10) according to any one of claims 1 to 10, an on-load tap-changer (1) and control device (6).

12. Arrangement (100) according to claim 11, comprising - a drive (4) with a motor (5) and the control device (6).

Images