Disconnector device with passive radio device, grid protection system having the disconnector device, and method for indicating a state of the disconnector device

1. A disconnector device being connectable to pole-mounted equipment in a power distribution or transmission grid, and being configured to be activated in case of an overload condition, thereby disconnecting the pole-mounted equipment,

the disconnector device comprising:

at least one passive radio device to be enabled via an incoming radio signal, wherein the passive radio device, upon being enabled, is configured to transmit, in at least one state of the disconnector device, an indicator radio signal indicative of the respective state of the disconnector device, the state being one of an activated state and a deactivated state of the disconnector device; and

an activation interactor configured to change the indicator radio signal of the passive radio device depending on the state, the changing the indicator radio signal including changing a frequency characteristic of the passive radio device.

2. The disconnector device according to claim 1 , wherein the activation interactor comprises a radiofrequency-altering material.

3. The disconnector device according to claim 1 , wherein the disconnector device is configured to effect, upon an activation of the disconnector device, a relative movement between the activation interactor and the passive radio device, thus changing the frequency characteristic of the passive radio device.

4. The disconnector device according to claim 3 , wherein changing the frequency characteristic comprises raising or lowering a resonance frequency of the passive radio device relative to an initial resonance frequency thereof.

5. The disconnector device according to claim 3 , comprising a first passive radio device and a second passive radio device, the first and second passive radio devices each adapted to have their respective frequency characteristic changed by the relative movement, wherein for the same relative movement, the change of frequency characteristic of the first passive radio device is different from the change of frequency characteristic of the second passive radio device.

6. The disconnector device according to claim 5 , wherein for the same relative movement and a predetermined rated resonance frequency, the frequency characteristic of the first passive radio device is shifted to be nearer to the resonance frequency than the frequency characteristic of the second passive radio device, and the frequency characteristic of the second passive radio device is shifted to be further from the resonance frequency than the frequency characteristic of the first passive radio device.

7. The disconnector device according to claim 1 , wherein the passive radio device is configured to change the indicator radio signal by sensing a property of the activation interactor.

8. The disconnector device according to claim 7 , wherein the activation interactor comprises a conductor configured and arranged such as to have an impedance that depends on the state.

9. The disconnector device according to claim 1 , wherein the passive radio device comprises an RFID element.

10. The disconnector device according to claim 1 , wherein the passive radio devices each comprise an RFID element, the RFID elements each having an identifier different from one another.

11. A connection status monitoring device for monitoring an electrical connection status of a disconnector device according to claim 1 , the connection status monitoring device comprising:

a determining section configured:

to perform a contactless detection of the indicator radio signal of the passive radio device,

to determine from the detected indicator radio signal whether the disconnector device is in one of the activated state and deactivated state, and

to generate connection status indicator data indicative of the result of determination.

12. The connection status monitoring device according to claim 11 , further comprising a wireless communication section adapted to connect to a wireless communication infrastructure using a wireless communication protocol, and to transmit the connection status indicator data over the wireless communication infrastructure.

13. Use of an assembly in a power distribution or transmission grid, the assembly comprising the disconnector device according to claim 1 , the disconnector device being connectable to pole-mounted equipment in the power distribution or transmission grid, and the assembly comprising a connection status monitoring device comprising a determining section configured:

to perform a contactless detection of the indicator radio signal of the passive radio device,

to determine from the detected indicator radio signal whether the disconnector device is in one of the activated state and deactivated state, and

to generate connection status indicator data indicative of the result of determination.

14. A grid protection system, comprising:

pole-mounted equipment connected to a power distribution or transmission grid;

the disconnector device according to claim 1 connected to the pole-mounted equipment; and

a connection status monitoring device comprising a determining section configured:

to perform a contactless detection of the indicator radio signal of the passive radio device,

to determine from the detected indicator radio signal whether the disconnector device is in one of the activated state and deactivated state, and

to generate connection status indicator data indicative of the result of determination.

15. The grid protection system according to claim 14 , wherein the pole-mounted equipment is electrically connected, through the disconnector device, between a line of the power distribution or transmission grid and ground.

16. An autonomous aerial vehicle comprising the connection status monitoring device according to claim 11 .

17. A method for indicating a state of a disconnector device, the disconnector device being connectable to pole-mounted equipment in a power distribution or transmission grid, and the disconnector device being configured to be activated in case of an overload condition, thereby disconnecting the pole-mounted equipment, wherein the disconnector device comprises at least one passive radio device to be enabled via an incoming radio signal, and the state being one of an activated state and a deactivated state of the disconnector device, the method comprising:

enabling the passive radio device;

when the disconnector device is in at least one of the states, transmitting, via the passive radio device, an indicator signal indicative of the respective state of the disconnector device; and

effecting, upon an activation of the disconnector device, a relative movement between an activation interactor and the passive radio device, thus changing the frequency characteristic of the passive radio device.