FIELD

Embodiments of present disclosure generally relate to data transmission, and more specifically, to a method and devices for data transmission in a substation.

BACKGROUND

In Cloud-based smart electrical systems, measurement data come from the local data collection/monitoring devices in various substations. However, many stations are located in remote or rural areas in which no Internet access (for example, via 3G/4G or LAN) is available. Therefore, how to push the so-called “offline data” from those substations to the Cloud server for presentation or further analyses become challenging.

There have been proposed some data transmission solutions, to migrate data from one or more source databases to one or more target databases. However, none of those methods aims at a scenario in which no Internet access is available. Till now, no effective solution is found to push such “offline data” to the Cloud server.

SUMMARY

Embodiments of the present disclosure provide a data transmission solution for use in a substation.

In first aspect, a data transmission method is provided. The method comprising: receiving, at a gateway, measurement data collected by at least one monitoring device in a substation; storing the received measurement data in a data storage that is accessible to the gateway in a predetermined format; detecting a status of a connection between the gateway and a first network, the first network enabling communication between the gateway and a server; and in response to detecting a disconnection between the gateway and the first network, sending the measurement data to a user device via a second network hosted by the gateway to enable the user device to forward the measurement data to the server.

In some embodiments, the first network is a wide area access (WAN) network, and the second network is a WI-FI network hosted by the gateway.

In some embodiments, receiving the measurement data comprising: receiving the measurement data through a field bus connected between the gate way and the at least one monitoring device.

In some embodiments, sending the measurement data to the user device includes: retrieving the measurement data from the data storage; encrypting the retrieved measurement data; and sending the encrypted measurement data to the user device.

In some embodiments, the method further comprises: receiving, at the user device, the measurement data from the gateway via the second network hosted by a gateway; detecting, a status of a connection between the user device and the first network, the first network enabling communication between the user device and the server; in response to detecting that the user device is connected to the first network, sending, via the first network, a first request for an access to the server; and in response to receiving, via the first network, a first authorization to the first request from the server, sending the measurement data to the server via the first network.

In some embodiments, sending the measurement data to the server comprises: in response to receiving the first authorization that is based on a category and geographical information associated with a user of the user device, sending the measurement data to the server.

In some embodiments, receiving the measurement data comprises: sending, via the second network, a request for the measurement data to the gateway; and in response to receiving, via the second network, a second authorization to the second request from the gateway, receiving the measurement data at the user device.

In some embodiments, receiving the measurement data at the user device comprises: in response to receiving the second authorization that is based on a category and a geographical information associated with a user of the user device, receiving the measurement data at the user device.

In some embodiments, the method further comprises: in response to receiving, via the first network, a confirmation of the measurement data being received at the server, deleting the measurement data from the user device.

In second aspect, a gateway is provided. The gateway comprises: a controller configured to: receive measurement data collected by at least one monitoring device in a substation; store the received measurement data in a data storage that is accessible with the gateway in a predetermined format; detect a status of a connection between the gateway and a first network, the first network enabling communication between the gateway and a server; and in response to detecting a disconnection between the gateway and the first network, send the measurement data to a user device via a second network hosted by the gateway to enable the user device to forward the measurement data to the server.

In some embodiments, the first network is a wide area access (WAN) network, and the second network is a WI-FI network hosted by the gateway.

In some embodiments, the gate way is connected to the at least one monitoring device through a field bus.

In some embodiments, the controller is further configured to: retrieve the measurement data from the data storage; encrypt the retrieved measurement data; and send the encrypted measurement data to the user device.

In third aspect, a user device is provided. The user device comprises: a controller configured to receive measurement data collected by at least one monitoring device in a substation, via a second network hosted by a gateway; detect, a status of a connection between the user device and a first network, the first network enabling communication between the user device and a server; and in response to detecting a connection between the user device and the first network, send, via the first network, a first request for an access to the server; and in response to receiving, via the first network, a first authorization to the first request from the server, send the measurement data to the server via the first network.

In some embodiments, the controller is further configured to: in response to receiving the first authorization that is based on a category and a geographical information associated with a user of the user device, send the measurement data to the server.

In some embodiments, the controller is further configured to: send, via the second network, a request for the measurement data to the gateway; and in response to g receiving, via the second network, a second authorization to the second request from the gateway, receive the measurement data at the user device.

In some embodiments, the controller is further configured to: in response to receiving the second authorization that is based on a category and a geographical information associated with a user of the user device, receive the measurement data at the user device.

In some embodiments, the controller is further configured to: in response to receiving, via the first network, a confirmation of the measurement data being received at the server, delete the measurement data from the user device.

In fourth aspect, a data transmission system in a substation is provided. The data transmission system comprises: at least one monitoring device configured to collect measurement data in the substation; a gateway connected to the at least one monitoring device via a field bus; and a user device, wherein the user device and the gateway are configured to jointly perform the data transmission method according to first aspect of the present disclosure, to forward the measurement data from the at least one monitoring device to the server.

