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Isolation handcart
Isolation handcart
Isolation handcart is one of the core functional units of medium and high voltage switchgear, mainly used to achieve circuit isolation, safety break, maintenance grounding, visible break point and other functions in high voltage distribution systems. It is widely matched with KYN28, XGN, VS1 and other series switchgear. The product adopts a modular handcart structure, with reliable mechanical interlocking, clear visible fracture, stable propulsion and extraction operations, meeting core requirements such as safe operation of the power system, equipment maintenance, and fault isolation. It is a key component to ensure personal and equipment safety.
Features
1.Reliable electrical isolation and visible fracture:
Adopting a clear visual breakpoint design, the insulation distance and creepage distance of the isolated fracture meet national and industry standards. During maintenance, it can be visually confirmed that the circuit is completely disconnected, significantly improving operational safety.
2.Improve mechanical interlocking and prevent misoperation:
Configure multiple mechanical interlocking mechanisms to achieve mandatory logic such as “closing cannot be pushed forward, pushing cannot be closed, grounding must be in place before opening the door, and locking cannot be released without being in place”, structurally eliminating dangerous operations such as pushing and pulling with load, accidental closing, and misoperation.
3.Stable structure, easy and smooth operation:
Using high-strength sheet metal and precision guide rails, combined with rolling/sliding mechanisms, the pushing, pulling, positioning, and locking actions are lightweight and reliable, with long-term frequent operation without jamming or deviation, and high maintenance efficiency.
4.Strong universality and good interchangeability:
According to the standard cabinet size and interface design, it can directly match mainstream medium and high voltage switchgear models. Products of the same specification have good interchangeability, making it easy to replace, expand, and modify on site.
5.Strong environmental adaptability and long lifespan:
The key insulation components are made of high-performance epoxy resin/unsaturated polyester material, and the mechanical structure is treated with anti-corrosion, rust prevention, and strengthening, which can adapt to indoor conventional and high humidity, high dust industrial environments. The mechanical and electrical life meets long-term operation requirements.
Rated voltage: 12kV/40.5kV (can be customized according to the system)
Rated current: commonly 630A, 1250A, 1600A, 2500A, 3150A
Protection level: When combined with the cabinet, it can reach IP4X or above
Operation mode: manual pushing/pulling, equipped with interlocking operating mechanism
Execution standards: GB/T 11022, GB 3906, DL/T 402 and other high-voltage switchgear related standards
Can be matched with: grounding switch, secondary aviation plug, position indicator, test position/working position positioning and other functions
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Specification
| No. | Name | Unit | Data | |
| 1 | Rated Voltage | kV | 12 | |
| 2 | Rated Frequency | Hz | 50 | |
| 3 | Rated Current | A | 630,1250,1600,2000,2500,3150,4000 | |
| 4 | Rated 1min Power Frequency Withstand Voltage | Phase-to-phase and to ground | kV | 42 |
| Fracture | 48 | |||
| Rated Lightning Impulse Withstand Voltage Peak Value (1.2/50μs) | Phase-to-phase and to ground | 75 | ||
| Fracture | 85 | |||
| 5 | 1min Power Frequency Withstand Voltage of Secondary Circuit | 2.5 | ||
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FAQs
What is the main difference between an isolation handcart and a circuit breaker handcart?
The isolation handcart mainly provides safety isolation, maintenance isolation, and visible circuit breaking points, but does not have short-circuit breaking capability; Circuit breaker handcart is used for breaking, closing, and protecting loads and fault currents, with arc extinguishing and short-circuit breaking capabilities. The two are usually used together in the system to achieve dual security of “protection+isolation”.
Under what circumstances must an isolation handcart be used?
The equipment must be used when it needs to be powered off for inspection, maintenance, testing, or when a clear, visible, and reliable electrical isolation fracture needs to be formed; At the same time, in the design of switchgear, it is used for scenarios such as busbar segmentation, line isolation, PT/lightning arrester circuit isolation, etc., to meet safety regulations and operation and maintenance requirements.
What are the functions of isolating the "test position" and "working position" of the handcart?
The test location is used for secondary circuit testing, interlock verification, and functional inspection. At this time, the main circuit is not connected to high voltage and can be safely tested; The working position is the main circuit normally connected to the system and the live operating position. Both positions have reliable positioning and locking to prevent accidental movement.
What should be done if the isolation handcart is stuck or not in place?
First, confirm whether the interlocking conditions are met (such as the circuit breaker being in the open position and the grounding switch being in the correct state), and then check whether the track is deformed, foreign objects, corroded, and whether the insulation parts are bumped or offset; Forced and violent operations are prohibited. Professional personnel should adjust the mechanism, lubricate the track, calibrate the dimensions, and if necessary, return to the factory for maintenance.
Can the isolation handcart be operated with load?
It’s not possible. The isolation handcart does not have an arc extinguishing device. It is strictly prohibited to push or pull it out with load. The isolation handcart must be operated only after the front-end circuit breaker/load switch has been opened and there is no load current in the circuit. Otherwise, it may cause arc short circuit, equipment damage, and personal danger.
Related Applications
Main busbar system of indoor high-voltage distribution station:
As an isolation unit for busbar segmentation, busbar connection, and incoming and outgoing line circuits, it provides reliable electrical isolation during busbar maintenance, segmented power outages, and switching operations in distribution stations, ensuring safe separation between different busbar sections, avoiding dangerous potential differences between maintenance sections and live sections, and ensuring the safety of busbar maintenance and expansion and renovation.
10kV/35kV switchgear circuit of substation:
The supporting substation medium voltage switchgear is used for isolation and maintenance breakpoints of circuits such as lines, transformers, capacitors, and station transformers. It is used in conjunction with circuit breakers to achieve the standard operating process of “first disconnect and then isolate, first close and then connect”, meeting the safety regulations for substation switching operations, equipment annual inspections, and fault repairs.
Power supply system for industrial and mining enterprises (factories, mines, metallurgy, chemical industry):
In the high-voltage distribution room of industrial enterprises, the power supply circuit isolation for important loads such as motors, water pumps, fans, compressors, and rectification devices is used to quickly form a safe break during equipment shutdown maintenance, process transformation, and fault investigation, reducing the scope of power outages and improving the reliability and maintenance safety of enterprise power supply.
Municipal and public building power supply (hospitals, data centers, rail transit, commercial complexes):
Applied to scenarios with extremely high requirements for power supply safety and continuity, as an isolation unit for critical distribution circuits, it achieves precise local power outages during annual preventive testing, equipment replacement, and system upgrades, without affecting the power supply of other important loads, while strictly meeting fire safety, power safety, and operation and maintenance regulations.
Photovoltaic/wind power box transformer and collection station medium voltage system:
Supporting the use of new energy box transformers, switch stations, and collection stations, it is used for isolation and maintenance of the high-voltage side of box transformers, collection lines, and grid connected circuits, adapting to outdoor/indoor cabinet environments. It provides safe isolation breakpoints during component cleaning, inverter maintenance, and line fault handling to ensure the safety of new energy station operation and maintenance.
