High voltage divider

Patent metadata

Field	Value
Publication number	US-9714957-B2
Application number	US-201415025352-A
Country	US
Kind code	B2
Filing date	Aug 19, 2014
Priority date	Sep 27, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

An HV divider stepping down an input high voltage in HV systems includes a primary part with first and second assemblies within an insulator and a divider input terminal. The first assembly is a first capacitor stack having first high and middle voltage capacitors. The second assembly has a second capacitor stack and resistor stack in parallel. The second capacitor stack has second high and low voltage capacitors. The resistor stack has high and low voltage resistors. The secondary part has an electromagnetic unit and a secondary part output set has: a first output terminal subset, deriving from a first intermediate terminal processed through electromagnetic unit, to provide a first output voltage subset for measuring amplitude of the input voltage at nominal frequency range; a second output terminal, deriving from a second intermediate terminal, to provide a second output voltage for measuring waveform of the input high voltage.

First claim

The invention claimed is:

1. An HV divider for stepping down an input high voltage in HV systems, the HV divider comprising:
a divider input terminal at which the input high voltage is applied and a divider output terminal set at which a set of output voltages are provided;
a primary part and a secondary part being electrically connected to each other and each having a respective input and a respective output, said output of said primary part being said input of said secondary part, said input of said primary part being said divider input terminal and said output of said secondary part being said divider output terminal set;
an insulator;
said primary part including a first assembly and a second assembly disposed within said insulator;
said first assembly being a first capacitor stack including a first high voltage capacitor and a middle voltage capacitor defining a point therebetween;
said second assembly including a second capacitor stack and a resistor stack electrically connected in parallel to each other, said second capacitor stack including a second high voltage capacitor and a low voltage capacitor defining a point therebetween, said resistor stack including a high voltage resistor and a low voltage resistor defining a point therebetween;
said output of said primary part being a set of intermediary terminals including at least:
a first intermediate terminal being connected to said point between said capacitors of said first capacitor stack; and
a second intermediate terminal being connected to a link connecting said point between said capacitors of said second capacitor stack and said point between said resistors of said resistor stack;

said secondary part including an electromagnetic unit, and said secondary part divider output terminal set including at least:
a first output terminal subset derived from said first intermediate terminal and processed through said electromagnetic unit to provide a first output voltage subset to be used for measuring an amplitude of the input high voltage at a nominal frequency range; and
a second output terminal subset derived from said second intermediate terminal to provide a second output voltage to be used for measuring a waveform of the input high voltage.

2. The HV divider according to claim 1 , wherein:
said first assembly has an output terminal;
a third intermediate terminal is connected to said output terminal of said first assembly; and
a third output terminal is derived from said third intermediate terminal to provide a third output voltage to be used for high frequency communications.

3. The HV divider according to claim 1 , wherein:
said first capacitor stack and said second capacitor stack are physically realized as first and second different column configurations;
said first column configuration includes a set of first-stack capacitor elements physically stacked together one above the other and electrically interconnected; and
said second column configuration includes a set of second-stack capacitor elements physically stacked together one above the other and electrically interconnected.

4. The HV divider according to claim 1 , wherein:
said first capacitor stack and said second capacitor stack are physically realized as one single column configuration;
said single column configuration includes a plurality of capacitor elements belonging to both capacitor stacks;
said capacitor elements of both capacitor stacks are physically stacked together one above the other; and
only said capacitor elements belonging to the same capacitor stack are electrically interconnected.

5. The HV divider according to claim 1 , wherein said electromagnetic unit includes at least an inductive middle voltage transformer, a compensation reactor and a filter circuit.

Assignees

• Siemens Ag

Inventors

• Giovanelli Lorenzo

Classifications

• H03H7/24

  Frequency- independent attenuators · CPC title

• H01G4/40

  Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations · CPC title

• H01G2/14

  Protection against electric or thermal overload (by cooling H01G2/08) · CPC title

• G01R15/16

  using capacitive devices · CPC title

• G01R15/142

  Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26 · CPC title