Abstract A device for selective location of an earth connection within a bus system adapted to interconnect the converter units and the external earthing of a converting substation employed in a H.T. direct-current electric transmission line, comprising DC transformers inserted both into each circuit adapted to connect the converter units of the like polarities to the bus system and into each earthing system; the secondary currents supplied from said transformers are fed to the differentiator through two summator and two rectifiers, one of the summators being adapted to effect subtraction of absolute magnitudes of the secondary currents characterizing the condition of the converter circuits of the unlike polarity, whereas the other summator is adapted to effect summing up of the absolute magnitudes of the secondary currents, characterized in that the condition of the earthing circuits. The signal produced by the differentiator is the evidence of the occurrence of an earth connection.
Inventors
👤 Albert Efimovich Gurevich
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 08:08
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
200 words
A device for selective location of an earth connection within a bus system adapted to interconnect converter units of like polarity and converter units of unlike polarity to the external earthing of a converting substation employed in a H.T. directcurrent electric transmission line, said bus system comprising: a plurality of earthing circuits connecting the bus system and the external earthing, further circuits connecting both converter units to the bus system, DC transformers inserted in each circuit connecting the converter units to said bus system and DC transformers inserted in each earthing circuit connecting said bus system to said external earthing, said device comprising: a first summator connected to the secondaries of the DC transformers in said circuits connecting said converter units to said bus system, said first summator being adapted to effect subtraction of the absolute magnitudes of the currents being fed thereto from the DC transformers; a second summator connected to the secondaries of said DC transformers in said earthing circuits, said second summator being adapted to effect summation of the absolute magnitudes of the currents being fed thereto; and a differentiator connector to said summators for producing a signal to indicate a ground connection in the bus system.
Claim 2
Independent Claim
200 words
A device for selective location of an earth connection within a bus system adapted to interconnect converter units of like polarity and converter units of unlike polarity to the external earthing of a converting substation employed in a H.T. directcurrent electric transmission line, said bus system comprising: a plurality of earthing circuits connecting the bus system and the external earthing, further circuits connecting both converter units to the bus system, DC transformers inserted in each circuit connecting the converter units to said bus system and DC transformers inserted in each earthing circuit connecting said bus system to said external earthing, said device comprising: a first summator connected to the secondaries of the DC transformers in said circuits connecting said converter units to said bus system, said first summator being adapted to effect subtraction of the absolute magnitudes of the currents being fed thereto from the DC transformers; a second summator connected to the secondaries of said DC transformers in said earthing circuits, said second summator being adapted to effect summation of the absolute magnitudes of the currents being fed thereto; and a differentiator connector to said summators for producing a signal to indicate a ground connection in the bus system.
Claim 3
Dependent Claim
17 words
A device as claimed in claim 1 comprising a rectifier connected between each summator and said differentiator.