Handcart Type Fixed High Voltage Board Panel Switchgear

The Handcart Type Fixed High Voltage Board Panel Switchgear is a metal-enclosed, air-insulated medium-voltage switchgear assembly designed for single-busbar and double-busbar systems. But what exactly is this product, and what can it do for your electrical infrastructure?

What it is:

It is a hybrid design that combines a fixed panel housing with a removable handcart mechanism for the primary switching devices (such as vacuum circuit breakers, contactors, or VSDs). The handcart can be physically rolled in and out of the panel, while the busbars, cables, and auxiliary components remain fixed within the enclosure. This design is standardized under IEC 62271-200 and GB3906 for rated voltages from 3kV to 40.5kV.

What it can do:

● Control power flow: It safely connects or disconnects high-voltage loads like transformers, motors, and capacitor banks.

● Provide fault protection: Integrated protective relays and circuit breakers trip automatically during overloads, short circuits, or earth faults.

● Enable safe maintenance: The handcart can be withdrawn to an isolated, earthed position, creating a visible air gap–allowing technicians to work on the breaker without de-energizing the entire busbar.

● Measure and monitor: Current transformers, voltage transformers, and digital meters mounted on the panel give real-time data on system status.

● Interlock safely: Mechanical and electrical interlocks prevent human errors like closing the breaker while the handcart is midway or accessing live compartments.

In short, this Handcart Type Fixed High Voltage Board Panel Switchgear acts as the gatekeeper of your high-voltage network–safe, flexible, and durable for 20+ years of service.

Product Parameters (Specification)

Below is the detailed technical specification table for our Handcart Type Fixed High Voltage Board Panel Switchgear. All values refer to typical 12kV models; other voltages available upon request.

Product Feature and Application (Q&A Format)

Q1: What makes the handcart design better than a fully fixed switchgear?

A: The handcart design allows the primary switching device (vacuum circuit breaker) to be physically removed from the panel for maintenance or replacement while the panel’s busbars remain energized. This reduces downtime from hours to minutes. In contrast, fixed switchgear often requires de-energizing an entire section to access the breaker. Our Handcart Type Fixed High Voltage Board Panel Switchgear gives you the best of both worlds: fixed busbars for ruggedness, plus handcart breakers for serviceability.

Q2: How does it ensure operator safety during racking?

A: Our switchgear includes five mandatory interlocks:

1. Breaker cannot be closed unless the handcart is in the “operating” (connected) position.

2. Handcart cannot be moved from “disconnected” to “connected” unless the breaker is open.

3. Earthing switch can only be closed when the handcart is in the “test/disconnected” position.

4. Cable compartment door can only be opened when earthing switch is closed.

5. Handcart cannot be inserted or withdrawn while the breaker is closed. These interlocks are both mechanical and electrical – fail-safe by design.

Q3: Can the Handcart Type Fixed High Voltage Board Panel Switchgear be used outdoors?

A: The standard enclosure is IP4X, suitable for indoor substations. For outdoor applications, we supply additional weatherproof housings or IP54-rated kiosks. Many customers install our switchgear inside containerized substations or small prefab buildings near wind farms or solar plants.

Q4: What are the most common applications for this switchgear?

A: This Handcart Type Fixed High Voltage Board Panel Switchgear is widely used in:

● Power utility substations (primary and secondary distribution).

● Industrial plants (steel mills, cement factories, petrochemicals)–for motor control and transformer protection.

● Commercial buildings (hospitals, data centers, airports)–where high reliability is required.

● Renewable energy (solar farms, wind farms)–as grid connection panels.

● Mining operations–robust enough for dusty, humid environments.

● Railway traction power supply–at 27.5kV or 2×25kV systems.

Production Details

1. Enclosure Material & Coating

● Material: 2mm thick high-grade galvanized steel sheet (imported from Baosteel), folded by CNC bending machines. Double-folded edges increase rigidity.

● Coating: Epoxy-polyester powder coating (minimum 80μm thickness) after sandblasting to SA 2.5 standard. Color RAL 7035 (light grey). Salt spray test >500 hours – no corrosion.

2. Handcart Mechanism

● Material: High-strength nylon rollers + stainless steel rails.

● Operation: Screw-in/screw-out leadscrew mechanism with anti-backlash design. Every handcart is tested for 2000 complete racking cycles.

● Position indicators: Red (connected), green (test), yellow (disconnected), visible from 5 meters away.

3. Shutters (Automatic Safety Barriers)

● When the handcart is withdrawn, spring-loaded metal shutters automatically cover the fixed primary contacts. This prevents accidental finger contact with live parts. Our shutters are made of 3mm aluminum alloy with anti-corrosion treatment.

4. Busbar System

● Material: High-conductivity E-Cu copper (99.9% purity). Silver-plated at all joints.

● Cross-section: Calculated to keep temperature rise below 65K at rated current. For 3150A, we use double busbars per phase.

● Insulation: Heat-shrinkable insulation sleeves (orange color) for phase identification and partial discharge control.

5. Earthing Switch

● Type: Quick-make, load-breaking, with visible earthing blades.

● Operation: Manual spring-assisted mechanism. Can close onto full short-circuit current (50kA once).

● Interlock: Exclusive mechanical interlock with handcart position – cannot close earthing switch unless handcart is in test/disconnected position.

6. Low-Voltage Compartment

● Located at the top front (height 300mm), fully segregated from high-voltage parts. Houses protective relays (microprocessor-based), control switches, indication lamps, and auxiliary fuses.

● Wiring: All secondary cables are numbered, bundled in flame-retardant PVC ducts, and terminated on terminal blocks with spare contacts (20% spare reserved).

7. Partial Discharge Control

● All high-voltage conductors are rounded to eliminate sharp edges.

● Every panel undergoes a partial discharge test (≤10pC at 1.1×Ur/√3).

8. Factory Assembly Accuracy

● Each Handcart Type Fixed High Voltage Board Panel Switchgear is assembled on a laser-aligned jig. Handcart-to-fixed contact misalignment is <0.5mm.

● Result: Smooth racking without grinding or force – no stuck handcarts even after years of use.

Why Choose Lugao for Handcart Type Medium Voltage Switchgear?

· Project-based engineering: Cabinet layout, busbar rating, protection relay scheme, CT/VT configuration and cable entry can be designed according to the single-line diagram.

· Standards-based manufacturing: Switchgear can be manufactured according to IEC 62271-200, GB/T 3906, DL/T 404 and project technical specifications.

· Flexible component selection: Lugao VCB, ABB, Siemens, Schneider or other specified component brands can be configured according to project requirements.

· Routine inspection before shipment: Mechanical operation, interlock function, wiring, insulation and power-frequency withstand tests can be performed before delivery according to the technical agreement.

· Technical document support: General arrangement drawings, single-line diagrams, secondary wiring diagrams, operation instructions and routine test reports can be provided for project reference.