CN2626041Y

CN2626041Y - Resistor type voltage divider for high-voltage circuit breaker

Info

Publication number: CN2626041Y
Application number: CN 03213856
Authority: CN
Inventors: 徐建源; 林莘; 李岩; 王胜辉
Original assignee: Shenyang University of Technology
Current assignee: Shenyang University of Technology
Priority date: 2003-06-27
Filing date: 2003-06-27
Publication date: 2004-07-14
Anticipated expiration: 2013-06-27

Abstract

The utility model relates to a resistance-type voltage divider used on a high-voltage circuit breaker and comprises an input end, an output end, a signal voltage end, a high-voltage resistance and two low-voltage resistances. The three terminals and a signal end of the resistance divider are respectively connected with an inlet terminal, an outlet terminal, an earthing end of switchgear and an electronic detection unit. The external insulation of the resistance divider is silicon rubber with umbrella skirt. The utility model has wide measurement range, high reliability and can meet the requirement of automatic power distribution and the intellectualization of the switch.

Description

The primary cut-out resistance divider

Affiliated technical field

The utility model relates to a kind of voltage measuring apparatus that matches with high voltage switchgear and use, particularly a kind of primary cut-out resistance divider.

Background technology

The voltage measuring apparatus of existing high voltage switchgear exists conventional iron core type instrument transformer saturation problem unshakable in one's determination and ferro resonance phenomenon, have load sharing during use, thereby reliability is restricted the intelligentized requirement of incompatibility power distribution automation and switch.

The utility model content

In order to solve the problem that existing high voltage switchgear voltage measuring apparatus exists, the utility model provides a kind of primary cut-out resistance divider.

Primary cut-out of the present utility model with resistance divider mainly by input V ₁, output V ₂, signal voltage end V _S, high-tension resistive R ₁, low resistance R ₂R ₃Form Deng part.R ₁R ₂R ₃Resistor group becomes voltage divider, and resistance divider has three terminals and a signal end, and they link to each other with end of incoming cables, leading-out terminal, grounding shell and the electronic detection unit of switchgear respectively.Its external insulation adopts silicon rubber and adds full skirt, is beneficial to outdoor switch equipment and uses.Can measure by detecting the voltage divider signal end voltage: 1. switch working state major loop line voltage distribution; 2. the voltage of switch open position sense switch end of incoming cables and the voltage of leading-out terminal.

1. at switch closed condition (main circuit current is non-vanishing): the resitstance voltage divider signal end voltage

V_{S} = \frac{V_{1}}{R_{2} + R_{3}} \cdot R_{3}

2. at the switch opens state:

V_{S} = \frac{V_{1}}{R_{1} + R_{2} + R_{3}} \cdot R_{3}

3. switch opens state (main circuit current is zero): and leading-out terminal has voltage V ₂The time

V_{S} = \frac{V_{2}}{R_{2} + R_{3}} \cdot R_{3}

Can obtain by the electronic detecting device that matches with it: the electrical measurement voltage signal; Overvoltage and under-voltage protection voltage signal; Contact voltage signal when automatic circuit is operated automatically, and blocking voltage signal.

The utility model has adapted to power distribution automation and the intelligentized requirement of switch, does not have conventional iron core type instrument transformer saturation problem unshakable in one's determination, has very big kinetic measurement and linear measurement interval; There is not the ferro resonance phenomenon; Also do not have load sharing, short circuit and open circuit all allow, thereby have high reliability; It absorbs energy hardly only from the electrical network acquired signal, can match with system controlled by computer, automatic protection well, meets the requirement of electric power system Microcomputer Protection, has satisfied the intelligentized requirement of power distribution automation and switch.

Description of drawings

Accompanying drawing is a structural representation of the present utility model.

Among the figure: 1 Switch main body, 2 voltage dividers, V ₁Input, V ₂Output, V _SThe signal voltage end, R ₁High-tension resistive, R ₂, R ₃Low resistance.

Embodiment

As shown in drawings: three terminals of resistance divider 2 link to each other with end of incoming cables, leading-out terminal, grounding shell and the electronic detection unit of switchgear 1 respectively with a signal end, by detecting voltage divider 2 signal end voltage V _SBut measuring switch operating state major loop line voltage distribution; Switch open position measuring switch end of incoming cables voltage and outlet voltage.

Claims

1, a kind of primary cut-out resistance divider is by input V ₁, output V ₂, signal voltage end V _S, high-tension resistive R ₁, low resistance R ₂R ₃Form, it is characterized in that three terminals and signal end of resitstance voltage divider, link to each other with end of incoming cables, leading-out terminal, grounding shell and the electronic detection unit of switchgear respectively.

2, primary cut-out resistance divider according to claim 1, the external insulation that it is characterized in that this voltage divider is silicon rubber and adds full skirt.