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ZW20-12 Type Pole-Mounted Circuit Breaker

The ZW20-12F/T–LO–LO series outdoor high-voltage vacuum circuit breaker (hereinafter referred to as the “circuit breaker”) is an outdoor distribution device with a rated voltage of 12 kV and a three-phase AC frequency of 50 Hz.

Keywords: High- and low-voltage complete sets – packaged substations – ring main units

Category:

Circuit breaker

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Product Description

　　Product Overview

　　The ZW20-12F/T LO-LO series outdoor high-voltage vacuum circuit breaker (hereinafter referred to as the “circuit breaker”) is an outdoor distribution device with a rated voltage of 12 kV and a three-phase AC frequency of 50 Hz.

　　Product Features

　　The enclosure incorporates VSP5–derived gas-sealing, explosion-proof, and insulation-encapsulation technologies, and the incoming and outgoing cable conduits have also been upgraded for enhanced sealing performance, resulting in excellent overall sealing. The SF6 gas充装 inside remains completely leak-free and is unaffected by external environmental conditions. The spring-operated mechanism has been miniaturized and optimized for greater reliability and stability, featuring a direct-chain primary drive and a multi-stage tripping system, which improve operational reliability and stability by several times compared with conventional domestic spring-operated mechanisms. Furthermore, the contact between the shaft and bushing in the main circuit adopts an internal-retracting, external-expanding link-type structure, ensuring low contact resistance and minimal temperature rise. Consequently, the ZW20-12F outdoor pole-mounted vacuum circuit breaker is a maintenance-free product.

　　Main Technical Parameters of the Product

Serial Number Project Unit Data
01 Rated voltage kilovolt 12
02 Rated frequency Hertz 50
03 Rated current A 630 1250
04 Rated short-circuit breaking current kA 20 25
05 Rated Peak Withstand Current kA 50 63
06 Rated short-time withstand current kA 20 25
07 Rated short-circuit making current kA 50 63
08 Rated Operating Sequence   Break - 0.3s - Close - 180s - Close
09 Mechanical life next 10000
10 Rated Current Interrupting Capacity next 10000
11 Rated short-circuit breaking operations next 30
12 Power-frequency withstand voltage for 1 minute (Wet) phase-to-ground kilovolt 34
(Dry) phase-to-phase, phase-to-ground/open-circuit kilovolt 42/48
13 Lightning Impulse Withstand Voltage Phase-to-phase, phase-to-ground/breaker contacts kilovolt 75/85
14 1-minute power-frequency withstand voltage of the secondary circuit v 2000
15 Quality kilogram Approximately 140
16 Contact opening distance mm 9±1
17 Contact travel mm 2.5±0.5
18 Average tripping speed millisecond 1.2±0.2
19 Average closing speed m/s 0.6±0.2
20 Rated operating voltage v AC/DC220
21 SF6 gas rated pressure (gauge pressure) megapascal 0
设计原理 动态屈光+单点多焦
镜片材质 PC太空镜片
瞳距标尺 54mm-68mm
镜片屈光度 +2.00D~-5.00D
眼镜尺寸 160*13.3*7.3mm
眼镜重量 45g
镜盒重量 239g
镜盒电池规格 2600ma
眼镜电池规格 180ma
传动系统寿命 50万次