VZF(R)-24/T160-50 handcart indoor HV vacuum load switch-fuse combination (hereinafter referred to the combination) is a new generation three-phase AC 50Hz indoor switchgear with a nominal voltage of 24kV. It is widely used in indoor armored air insulation switch cabinets. It complies with the requirements stipulated in standards such as GB 3804-2004 and GB 16926-1997. Under normal service conditions, if values are within the ranges of technical parameters, the vacuum switch can operate safely and reliably in the electrical grid with corresponding voltage class.
Service conditions of handcart indoor HV vacuum load switch-fuse combination VZF(R)-24/T160-50
a.The ambient temperature shall not be above +40℃ or below -10℃ (It can be stored and transported at -30℃).
b.The altitude shall not exceed 1500 meters.
c.Relative humidity: The daily mean should not exceed 95% and the monthly mean should not be greater than 90%. The mean of saturated vapor pressure should not be greater than 2.2×10-3Mpa. The monthly mean should not be greater than 1.8×10-3Mpa.
d.The seismic intensity shall not exceed 8 on the Richter scale.
e.The place shall be free of fire hazards, explosion hazards, heavy pollution, chemical corrosion and strenuous vibration.
Main specifications and technical parameters of handcart indoor HV vacuum load switch-fuse combination VZF(R)-24/T160-50
See Table 1 for main specifications and technical parameters
Rated lightning impulse withstand voltage, peak value
One-minute power frequency withstand voltage
Rated current of vacuum load switch
Short-term withstand current
Duration of short-term withstand current
Maximum rated current of fuse
Rated short-circuit breaking current(fuse)
Rated transfer current
Rated take-over current
For mechanical characteristic parameters of the circuit breaker after the assembly and adjustment, see Table 2
Clearance between open contacts
Average closing speed
Average opening speed
Opening time (rated voltage)
Closing time (rated voltage)
Contact closing bounce time
Asynchronous three-phase closing
Allowable gross wear thickness of mobile and fixed contacts
Resistance in the main circuit
Contact pressure on closing contact
Structural features of handcart indoor HV vacuum load switch-fuse combination VZF(R)-24/T160-50
VZF(R)-24 series combination organically integrate the current limit fuse and the vacuum arc-extinguishing chamber through solid sealed polar pole to constitute a series loop in which the vacuum switch body (vacuum arc extinguishing chamber) closes and opens various load currents and overcurrent and the current limit fuse is responsible for the breaking of short-ciruit current.
The combination adopts a form in which the polar pole and the front and back parts of the operating mechanism are arranged as one thing. This simplifies the transmission link, makes the output characteristics of the mechanism fit the load characteristics required by the vacuum switch, reduces the energy consumption and enhances the mechanical reliability.
The three-phase polar pole of the combination is a “F”-shaped polar pole formed through the automatic pressure gelation process (APG). The polar pole structure protects external insulation of the vacuum arc-extinguishing chamber from the influence of power, dust, and humidity and reduces the pollution to the shell, thus raising the reliability. The three-phase fuse is installed at the top of “F” polar pole. Its structural design fully considers the electric field section of the vacuum switch in the central switch cabinet, greatly lowers the adverse impact of inductive device on the cabinet pressure test, and enhances the dielectric strength of the complete set of cabinet products.
The most frequently used VS1 spring operating mechanism in the existing market is adopted. This operating mechanism through long-term use and modification, now deliver stable and reliable performance.
d.Assembly and repair
The combination is solid-sealed and the operating mechanism is very stable and reliable. Thus, the assembly and maintenance need less time and strength relatively.