VTD9-12D Indoor High Voltage AC Vacuum Circuit Breaker

General
The VTD9-12D indoor high-voltage AC vacuum circuit breaker is an indoor switching device capable of closing, carrying, and breaking current under normal circuit conditions, carrying specified over-current within a specified time, and closing and breaking current under abnormal circuit conditions (such as various short-circuit conditions). It is suitable for three-phase AC 50/60Hz, 12KV power systems and serves as a control and protection unit for electrical facilities such as industrial and mining enterprises, photovoltaic wind power, residential areas, and urban complexes.

product details

Detail introduction

Due to the special advantages of vacuum circuit breakers, they are particularly suitable for frequent operations that require a rated working current, or for places where short-circuit currents are broken multiple times. The three poles of this circuit breaker are longitudinally fixed on the side mounted chassis, including isolation switches, circuit breakers, earthing switches, and operating mechanisms, forming a side mounted structure. Due to its characteristics of miniaturization, integration, modularization, low maintenance, and consistent appearance, it is particularly suitable for installation in confined spaces such as distribution rooms, prefabricated substations, underearth garages, etc.

Quality standard

Product quality assurance is based on continuous improvement of research, development, design, and production processes that meet all aspects of the quality system requirements. It fully complies with the latest versions or modified versions of the following standards, specifications, and guidelines, and is not limited to them.

IEC62271-1	High voltage switchgear and control gear - Part 1: Common technical requirements for AC switchgear and control gear
IEC62271-100	High voltage switchgear and control equipment - Part 100: High voltage AC circuit breakers
GB1984	AC High Voltage Circuit Breaker
GB/T11022	Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards
DL/T402	High Voltage AC Circuit Breaker
JB/T3855	High voltage AC vacuum circuit breaker

Service Conditions

a. Environmental temperature: - 25℃ ~ +40℃;

b. Altitude: ≤ 1000m;

c. Relative humidity: Daily average relative humidity ≤ 95%

Monthly average relative humidity ≤ 90%

Daily average vapor pressure ≤ 2.2x10-3 MPa

Monthly average vapor pressure ≤1.8x10-3MPa;

d. Seismic grade: seismic intensity ≤ 8;

e. The applicable location is free from dripping water, flammable and explosive hazards, chemical corrosive gases, and severe vibrations.

※Note: When the usage environment deviates from normal usage conditions, please consult with our company to determine.

Technical parameter

Item		Unit	Parameter
Rated frequency		Hz	50/60
Rated voltage		kV	12
Rated power frequency withstand voltage (1 minute, r.m.s)	Phase to phase and phase to earth	KV	42
	Isolation fracture		48
	Control and auxiliary circuits		2
Rated lightning impulse withstand voltage (peak)	Phase to phase and phase to earth	kV	75
	Isolation fracture		85
Rated current		A	630, 1250
Rated short-circuit breaking current (rm..s)		kA	20, 25, 31.5
Rated short-time withstand current and time		kA/s	20/4, 25/4, 31.5/4
Rated peak withstand current		kA	50, 63, 80
Rated short-circuit making current (peak)		kA	50, 63, 80
Rated breaking current of single/back-to-back capacitor group		A	400(630)/400
Rated capacitor bank making current		kA	2.5 ( fre.≤1000Hz)
Rated handover (transfer) current		A	/
Mechanical life		Times	10000
Main circuit resistance of each phase		mΩ	≤ 80, ≤ 70
Clearance between open contacts		mm	9 ± 1
Contacting travel		mm	5.5 ± 1
Contact closing bounce time		mm	≤2
Three-phase asynchronous closing and opening		ms	≤2
Average opening speed (contact just opened - 6mm)		m/s	0.9 ~1.3
Average closing speed ( 6mm - contact just opened)		m/s	0.4 ~ 0.8
Rated contact pressure		N	2400±200 (20 - 25kA)
			3100±200 (31, 5kA)
Opening time (at rated voltage)		ms	≤ 45
Closing time (at rated voltage)		ms	≤ 70
Rated operating sequence			O-0.3s-CO-180s-CO

Technical characteristics

● Reasonable design and novel structure

The operating mechanism is integrated with the "five-prevention" interlocking mechanism, and modular design is adopted for components such as the (circuit breaker) solid-sealed pole and the earthing switch. These components are combined into a single unit through a common mounting frame.

The operating panel indicators are integrated with the primary circuit indicators, providing clear, simple, and easy-to-understand indications. The interlocking design is rationally integrated to form a "foolproof" operating procedure, making incorrect operations "impossible".

● Miniaturization

Compared with air-insulated switches of the same model and specification, the device has a smaller volume, with a cabinet width of only 500 mm. It is a paragon of the new generation of miniaturized air-insulated switchgear.

● Less maintenance

The device uses maintenance-free vacuum (arc extinguishing chamber) switch (poles), which are virtually maintenance-free, have a long service life, and offer low operating costs.

● Visual Consistency

VTD9 circuit breaker, FTD9 load switch, and GTD isolating switch have identical external dimensions, facilitating the expansion and combination of switchgear cabinets.