Apparatus and method for sectioning the phase conductors of an electric power distribution network

Patent metadata

Field	Value
Publication number	US-9659730-B2
Application number	US-201414273062-A
Country	US
Kind code	B2
Filing date	May 8, 2014
Priority date	May 10, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The invention relates to an apparatus ( 50 ) for sectioning the phase conductors (L1, L2, L3) of a multi-phase electric power distribution network (NET) comprising a plurality of disconnectors (1, 2, 3), each disconnector being operatively associated to a related said phase conductor and comprising switching means (S) for sectioning a related phase conductor and a control unit (CU) that is capable of controlling said switching means and is capable of wireless communicating with remote devices. The control units of said disconnectors (1, 2, 3) execute different managing procedure depending on the operating status of said electric power distribution network. In a further aspect, the invention relates to a control system for executing the above described method.

First claim

The invention claimed is:

1. An apparatus ( 50 ) for sectioning the phase conductors (L1, L2, L3) of a multi-phase electric power distribution network (NET) comprising a plurality of disconnectors, each disconnector being operatively associated to a related phase conductor and comprising switching means for sectioning the related phase conductor and a control unit that is capable of controlling said switching means and is capable of wireless communicating with other remote devices;
wherein the control units of said disconnectors:
execute a normal-condition procedure, if the control unit of each disconnector determines the occurrence of normal conditions for said power distribution network, during said normal-condition procedure the control unit of each disconnector switching in turn between a transmission mode, in which said control unit broadcasts first data packages (DP 1 ) related to its operating conditions and/or the operating conditions of the power distribution network, and a turn-off mode, in which said control unit does not transmit or receive data packages from the control units of the other disconnectors;
execute a non-sectioning procedure, if the control unit of one disconnector determines the occurrence of a fault event and the occurrence of non-sectioning conditions for said power distribution network, during said non-sectioning procedure the control unit of each disconnector switching in turn between a transmission mode, in which said control unit broadcasts second data packages (DP 2 ) related to its operating conditions and/or the operating conditions of the power distribution network, and a receiving mode, in which said control unit waits for receiving the second data packages (DP 2 ) broadcasted by the control units of the other disconnectors;
execute a sectioning procedure, if the control unit of one disconnector determines the occurrence of a fault event and the occurrence of sectioning conditions for said power distribution network, during said sectioning procedure the control unit that has determined the occurrence of said fault event coordinating the control units of the other disconnectors, so that the control units of said disconnectors synchronously command the sectioning of the phase conductors of said power distribution network at a predetermined intervention time (TI).

2. An apparatus, according to claim 1 , wherein the control units of said disconnectors execute a synchronization procedure to synchronize their internal clocks.

3. An apparatus, according to claim 2 , wherein, during said synchronization procedure:
the control unit of a predefined disconnector switches in a transmission mode to broadcast synchronization data packages (TF) for a predetermined period of time;
the control units of the other disconnectors switch in a receiving mode to receive said synchronization data packages (TF) and synchronize their internal clocks on the base of said synchronization data packages (TF).

4. An apparatus, according to claim 1 , wherein the control units of said disconnectors execute a determination procedure, during said determination procedure the control unit of each disconnector acquiring data (DS) related to the operating status of said power distribution network and determining the operating conditions of said power distribution network.

5. An apparatus, according to claim 1 , wherein, during said normal-condition procedure, the control unit of each disconnector switches in turn in the transmission mode to broadcast said first data packages (DP 1 ) for a first predefined time frame (T1) and switches in turn in the turn-off mode for a second predefined time frame (T2), the control unit of each disconnector performing a switching cycle between said transmission mode and said turn-off mode, which has a duty cycle value DC=T1/(T1+T2) that is less than 2%, where T1, T2 are said first and second time frames.

6. An apparatus, according to claim 1 , wherein, during said non-sectioning procedure:
all the control units of said disconnectors simultaneously switch in a receiving mode for a predefined third time frame (T3);

and after said third time frame-(T3) has elapsed:
the control unit of each disconnector switches in turn in the transmission mode to broadcast said second data packages (DP 2 ) for a fourth predefined time frame (T4);
the control unit of each disconnector switches in turn in a receiving mode to receive said second data packages (DP 2 ) for a fifth predefined time frame (T5).

7. An apparatus, according to claim 1 , wherein, during said sectioning procedure:
the control unit that has determined the occurrence of said fault event switches in a transmission mode to broadcast tripping-request data packages (TRQ) for a sixth predefined time frame (T6);
the control unit that has determined the occurrence of said fault event switches in a receiving mode to wait for response data packages (ACK1, ACK2) from the control units of the other disconnectors for a seventh predefined time frame (T7);
the control unit that has determined the occurrence of said fault event switches in a transmission mode to broadcast trip-abort data packages (TRA), if negative-response data packages (ACK2) or no response data packages are received from the control units of the other disconnectors within said seventh time frame (T7); or
the control unit of each disconnector commands the sectioning of the related phase conductor at said intervention instant (TI), if no abort-data packages (TRA) are broadcasted by the control unit that has determined the occurrence of said fault event before said intervention instant (TI).

8. A method for sectioning the phase conductors of a multi-phase electric power distribution network (NET) comprising the step of:
providing a plurality of disconnectors, each disconnector being operatively associated to a related phase conductor and comprising switching means for sectioning the related phase conductor and a control unit that is capable of controlling said switching means and is capable of wireless communicating with other remote devices;

wherein it comprises the steps of:
executing a normal-condition procedure, if the control unit of each disconnector determines the occurrence of normal conditions for said power distribution network, during said normal-condition procedure the control unit of each disconnector switching in turn between a transmission mode, in which said control unit broadcasts first data packages (DP 1 ) related to its operating conditions and/or the operating conditions of the power distribution network, and a turn-off mode, in which said control unit does not transmit or receive data packages from the control units of the other disconnectors;
executing a non-sectioning procedure, if the control unit of one disconnector determines the occurrence of a fault event and the occurrence of non-sectioning conditions for said power distribution network, during said non-sectioning procedure the control unit of each disconnector switching in turn between a transmission mode, in which said control unit broadcasts second data packages (DP 2 ) related to its operating conditions and/or the operating conditions of the power distribution network, and a receiving mode, in which said control unit waits for receiving the second data packages broadcasted by the control units of the other disconnectors;
executing a sectioning procedure, if the control unit of one disconnector determines the occurrence of a fault event and the occurrence of sectioning conditions for said power distribution network, during said sectioning procedure the control unit that has determined the occurrence of said fault event coordinating the control units of the other disconnectors, so that the control units of said disconnector

Assignees

• Abb Technology Ag
• Abb Schweiz Ag

Inventors

• Leandro Vacirca

Classifications

• H01H50/002

  particular to three-phase electromagnetic relays (synchronous switching H01H9/563) · CPC title

• H01H47/001 Primary

  Functional circuits, e.g. logic, sequencing, interlocking circuits · CPC title

• H03H11/12

  using amplifiers with feedback ({H03H11/0422} , H03H11/08, H03H11/10 take precedence) · CPC title

• H01H2300/052

  Controlling, signalling or testing correct functioning of a switch · CPC title

• H01H2300/038

  Preselection, i.e. the output of a switch depends on a particular preselection, e.g. a particular position of another switch · CPC title