The entire tower needs to be tested in Full-scale Tower Test. The content of the test depends on the tower type and working conditions. The main purpose is to verify the overall load-bearing capacity, overall deformation, and load-bearing capacity of components and nodes through full-load or overload tests. CICA and its components have undergone the following main mechanical tests: 1. The overall bearing capacity test of the cross arm under static load and the mechanical performance test of the members; 2. The low cycle and high cycle fatigue tests of the cross arm components and insulator members under dynamic load .

The new tower type requires Full-scale Tower Test, and other tests can be selected according to the relevant provisions of IEC61952 and IEC61109 for design test, type test, sampling test, factory test and other project types.

CICA is classified according to the structure, and can be mainly divided into: single-post type; single-post and suspension type; and double-post and suspension type.

The cross arm is mainly composed of line-type insulators whose force-bearing components are axially stretched and post-type insulators whose force-bearing components are bent and compressed. The axial structure of the pultruded profile is very good, being able to meet the force characteristics of the line insulator, and the circumferential and axial reliability of the fiber-wound structure is very high, being able to meet the compression and bending requirements of the post-type insulator.

The structure of CICA is related to the line voltage level and the climatic conditions (load conditions) in the area. In general, single-column and single-column cable-stayed types are generally suitable for low-voltage and low-load lines, and double-column cable-stayed type is mostly used for high-voltage and high-load lines.

At present, the towers developed by CICA are mainly linear towers, tensile and corner towers are under development. Preliminary research results show that the design and application of small-angle tensile towers can be carried out under suitable conditions and requirements, and it has certain economic efficiency. CICA linear tower mainly developed 35kV-110kV CICA steel tube towers and CICA angle steel towers covering all voltage levels. Due to the strong designability of the CICA end flange and the high strength of the composite material, it can be applied to any tower type.

At present, the CICA tower has developed upper font, drum, wine glass, diamond and other structural types. The towers of other structural forms will be based on the research results of new materials and new technologies, combined with engineering practice, economy and reliability to design. When the CICA tower is matched with other tower types, it is necessary to pay attention to the change of the conductor direction due to the reduction of the height of the cross arm and the reduction of the length of the cross arm corridor. If necessary, it is necessary to check the load of the adjacent straight tower.

CICA has construction holes at the end of the post insulator flange, which can be hoisted. There are three main ways to assemble CICA: 1) CICA is assembled and hoisted together with the corresponding iron tower section on the construction ground (750kV, 220kV double-circuit drum tower); 2) The cross arm insulator can be hoisted and assembled by the ground wire cross arm. (DC 800kV rotating cross arm); 3) The first two ways are combined for assembly and hoisting (220kV double-circuit single-pillar cable-type CICA tower);

Regarding the installation method of the wire, the wire can be hung on the ground cross arm first, and after the CICA is assembled, the wire can be hung on the end of the cross arm (±800kV) by connecting fittings. It is also possible to assemble the CICA tower (section assembly or separate hoisting cross arm) first, and then hoist and suspend the conductor through the construction hole at the end of the cross arm and the ground wire cross arm (220kV).

Because the cross arm insulator of the CICA tower is filled with polyurethane composite material, it has excellent insulation performance, stable chemical performance, and has the advantages of fatigue resistance, abrasion resistance, light weight, high strength, and excellent processing performance. The erection of the CICA tower will increase the phase-to-ground insulation distance and reduce the average potential gradient of the arc, which is not conducive to the stable combustion of the arc. Its single-phase grounding fault arc establishment rate is greatly reduced, which improves the level of lightning protection and reduces the probability of lightning strikes.

SHEMAR's new maintenance-free CICA towers are mostly arranged horizontally or slightly inclined. Compared with the suspension insulators, this unique layout can effectively enhance the self-cleaning performance of the product (not easy to accumulate) which makes the product have excellent resistance to pollution flashover, rain flashover and ice flashover. In addition, the outer insulation material of the CICA tower has excellent water repellency and water repellency, and its anti-fouling performance is significantly improved.

CICA has considered the load to be borne during operation and maintenance during the design, and its insulator auxiliary shed meets the requirements of the standard (DL/T376) in terms of hardness, tensile strength, tear strength, elongation at break and other physical and mechanical properties. The various mechanical performance indexes of the insulating pressure tube and the insulating drawing tube also meet the requirements of the national standards. CICA has good anti-aging performance. The insulator auxiliary shed can remain soft for a long time, with good toughness and bendable, so long-term trampling has no effect on CICA. For the case of long-term trampling, composite tensile insulators have been verified, but the best requirements for trampling footwear are: soft-soled shoes, and avoid direct contact with sharp or hard objects with the insulator auxiliary shed to avoid scratches.

CICA factory test is mainly for mechanical test (bending, tensile or compression test) and electrical test (power frequency withstand voltage). The technical regulations for overhead transmission line towers and composite cross arms are divided into 5 parts, namely Part 1: Design technology; Part 2: Component technology; Part 3: Test technology; Part 4: Installation technology; Part 5: Operation and maintenance Guidelines. But corresponding to each component, you can refer to related standards, such as IEC61109, IEC61952 and other international standards.

Among them:

The design technology mainly includes: wire and layout, insulation coordination, fittings, tower load calculation, structural design, online monitoring, etc.;

The component technology mainly includes: the component composition of the composite cross arm, the technical requirements of the composite cross arm, inspection rules, and the packaging, transportation and storage of the composite cross arm;

The test technology mainly includes: cross-arm structure performance test, such as: material mechanical performance test, member stability test, node connection performance test, cross-arm structure load test, tower structure load test, member fatigue test, joint fatigue test, cross-arm Load overall fatigue test; cross-arm electrical performance test, such as: lightning impulse dry withstand voltage test, operation impulse wet withstand voltage test, power frequency dry withstand voltage test, artificial pollution withstand voltage test, visible corona and radio interference test, potential distribution test, aging test, etc.;

The installation process mainly includes: basic regulations, construction methods, such as: process flow, construction preparation, ground assembly, assembly acceptance, force calculation, overall hoisting, hoisting acceptance. Quality requirements, safety agent environmental protection requirements, etc.;

The operation and maintenance guidelines mainly include: basic requirements, operation standards, inspections, inspections, maintenance, special sections and weather operation requirements, technical management, etc.