IEC 61439-5 Static Load Test Bench for Switchgear Enclosure Mechanical Strength Testing

This static load test bench mainly used for mechanical loading tests and related research tests of low-voltage metering boxes, prefabricated substations and electrical equipment enclosures. It can conveniently conduct mechanical property tests on various types of metering boxes, including metal metering boxes, non-metallic metering boxes and cable distribution boxes.

It adopts integrated intelligent PLC central control with touch screen for display and operation. Test data can generate force-time curves. Parameters are set via the touch screen interface, and the whole testing process runs automatically. Pressure can be applied automatically from the side and top. Compatible with specimens of various sizes, it is reliable preferred equipment for testing institutions and laboratories.

This Static Load Test Bench is designed and manufactured in accordance with the below international & industry standards:

• IEC 61439-1 / IEC 61439-2
• IEC 61851-1:2019 / IEC 61851-1:2017 Clause 6.5.2
• EN IEC 61851-1:2019 / IEC 61851-1:2017

This test bench adopts a semi-enclosed structure, consisting of a horizontal loading section and a vertical loading section. Each loading actuator can move freely within the plane with 3 degrees of freedom. The three actuators jointly realize mobile loading with 8 degrees of freedom.

The crossbar height can be adjusted in stages via mounting holes. The base fixture can move forward, backward, left and right for clamping. It is equipped with a bench vice, and small specimens can be rotated with firm and reliable fixation.

Custom clamping blocks are configured for different products to facilitate securing. Different test pressing plates are equipped according to standards for various test items.

The equipment structure diagram is shown below:

The system adopts a modular design philosophy and is manufactured in strict compliance with standard requirements. Standardized design and components are utilized wherever possible to deliver optimized performance and reliable technical support. Controlled by Mitsubishi PLC, the entire system features high reliability and intelligent operation. It boasts clear functional logic, compact structure, attractive appearance and rational layout, facilitating maintenance and daily upkeep. The design and manufacture of the equipment meet customers’ general technical specifications. The system is divided into the following units:

Sample bearing platform:

The load-bearing platform is integrally constructed with reinforced support steel frames and thick steel plates. The specimen clamping mechanism and moving assemblies for left & right manipulators are mounted on top of the platform.

Force application mechanism:

The force application system consists of three manipulator sets: left horizontal manipulator, right horizontal manipulator and vertical manipulator. Each set is composed of a servo motor paired with a precision electric cylinder. A high-precision force sensor is fitted at the front end of each manipulator. The pressing head adopts an angled floating universal joint, which enables automatic self-centering to ensure full contact and stable force loading.

Transmission mechanism:

This section consists of moving mechanisms matched with the force application assembly for pressing test specimens. The respective degrees of freedom are illustrated in the figure below:

Control system:

This unit is mainly composed of PLC processor, control circuits and core control components. All electrical control components of the system are centrally installed inside one cabinet equipped with ventilation exhaust devices.

This unit adopts Mitsubishi PLC for intelligent control.

Equipped with self-developed testing software; operation can be realized via simple parameter settings.