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Multi-breaker and thermotropic type resistor combined grading resistance rising fault current limiter

A technology of fault current limiter and circuit breaker, which is applied in the direction of overcurrent protection, automatic disconnection emergency protection device, electrical components, etc., which can solve the problem of increasing system impedance, affecting power grid economy and safety, and Large and other problems, to achieve the effect of ensuring the safety of breaking, low maintenance cost, and small power loss

Active Publication Date: 2014-05-07
张健
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (3) There is a certain limit capacity and current limit time;
At present, most of the high-voltage power grids at home and abroad use series reactors to limit the short-circuit current. The disadvantage is that it increases the system impedance and consumes a lot of reactive power, which affects the economy and safety of the power grid.

Method used

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  • Multi-breaker and thermotropic type resistor combined grading resistance rising fault current limiter
  • Multi-breaker and thermotropic type resistor combined grading resistance rising fault current limiter
  • Multi-breaker and thermotropic type resistor combined grading resistance rising fault current limiter

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1: as figure 1 As shown, this embodiment is a fault current limiter with multi-circuit breakers and positive temperature resistors combined with graded resistance. The busbar is connected to the direction of the transmission line through the main circuit breaker DL0 and the first group of graded resistance units. The second group of graded resistance risers and a resistor R3 are sequentially connected in parallel on the first group of graded riser resistance units. The second circuit breaker DL2 is connected in series with a resistor R2. The first group of graded lifting resistance units and the second group of graded lifting resistance units are connected through isolation switches G1 and G2. Both ends of the resistor R3 are respectively connected to overvoltage protection arresters FZ1 and FZ2 and grounded. In this embodiment, all circuit breakers (DL0-DL3) and all resistors (R1-R3) are integrated and placed in a closed SF6 gas box, and manufactured as a ...

Embodiment 2

[0068] Embodiment 2: as Figure 4 As shown, this embodiment is a fault current limiter with multi-circuit breakers and positive temperature resistors combined with step-up resistance. The structure and working principle of this embodiment are basically the same as those of Embodiment 1. From the busbar, through the main circuit breaker DL0, the first group of graded resistance riser units are connected to the direction of the transmission line. The first group of graded riser resistance units are connected in parallel with the second and third groups of graded riser resistance units and a resistor R4, of which the first group The group of graded lifting resistance unit is composed of the first circuit breaker DL1 and resistor R1 in series, the second group of graded lifting resistance unit is composed of the second circuit breaker DL2 and resistor R2 in series, the third group of graded lifting DL3 is connected in series with resistor R3. The first group of graded lifting res...

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Abstract

The invention relates to a multi-breaker and thermotropic type resistor combined grading resistance rising fault current limiter which is low in cost, is suitable for 500KV-class and higher voltage classes, and improves operation safety of a power grid. According to the technical scheme, the multi-breaker and thermotropic type resistor combined grading resistance rising fault current limiter is connected from a bus, passes through a main breaker DL0 and a first group of grading resistance rising unit in sequence, and is connected to the direction of a power transmission line, from the second group of grading resistance rising unit to the (n-1)th group of grading resistance rising units are sequentially connected to the first group of grading resistance rising unit in parallel, the tail end of the first group of grading resistance rising unit is connected with a resistor Rn in parallel, the ith group of grading resistance rising unit is formed by connecting the ith breaker and a resistor Ri in series, the first group of grading resistance rising unit is connected with the second group of grading resistance rising unit through a high voltage isolating switch G1 and a high voltage isolating switch G2, the two ends of the resistor Rn are connected with an overvoltage protection lightning arrester FZ1 and an overvoltage protection lightning arrester FZ2 respectively and are grounded, the n is any natural number from three to nine, and the i is not smaller than 1 and not more than (n-1).

Description

technical field [0001] The invention relates to a fault current limiter which combines multi-circuit breakers and positive temperature type resistors to increase resistance in stages. The utility model is applicable to the technical field of power grid safety devices. Background technique [0002] With the continuous increase of the overall capacity of regional power grids in our country, the continuous operation of large-capacity generator sets and the interconnection of power grids in various regions, the level of short-circuit current in power systems is increasing day by day. The short-circuit current of power grids in many regions has reached or even exceeded the requirements of power regulations Limit the maximum allowed value. If the short-circuit current is too large (such as 63kA or above 80kA), the power grid will face the safety threat of being unable to disconnect near-field faults. At the same time, it will cause excessive thermal effects and electrodynamic eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H3/08H02H3/06
Inventor 张健
Owner 张健
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