GB 17620-1998 General technical requirements for insulated rigid ladders for live working
Some standard content:
B17620-1998
This standard adopts JEC 832:1988 "Basic parameters, technical requirements and test methods of insulating materials" and adopts IEC855:1985 "foam-filled insulating tubes and insulating rods for live working" in a non-equivalent manner. At the same time, some parts of the standard are taken from the current national standards. At present, countries around the world have carried out live working, and the types of insulating hard ladders for live working have not been unified, nor have international standards been formulated. In order to "promote the development of my country's live working technology to a high level on the basis of ensuring the safety of personnel and power equipment, in 1992, according to the requirements of the State Technical Supervision Bureau's Standard No. 025 (1992), we collected and sorted out relevant domestic and foreign data and documents, and began to draft the standard: After four discussions and revisions by the National Live Working Standardization Technical Committee, this standard was formed. This standard was proposed by the Ministry of Electric Power Industry of the People's Republic of China. This standard is under the jurisdiction of the National Live Working Standardization Technical Committee. The drafting units of this standard: Beijing Power Supply Bureau, Si'an Power Supply Bureau. The main drafters of this standard: Song Hengjia, Zhang Jianhua, the main inspection..com National Standard of the People's Republic of China
General specification for insulating rigid ladders for live workingGeneral specification for insulating rigid ladders for live working working1 Scope
GB17620—1998
This standard specifies the classification, technical requirements, test items, test methods, inspection rules and markings of insulating rigid ladders for live working. This standard applies to insulating rigid ladders of different structural types for live working from 10 to 500 kV. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB 311.1—1997 Insulation coordination of high-voltage power transmission and transformation equipmentGB/T5130—1997 Test method for industrial rigid laminates of thermosetting resins for electrical useGB/T 5132—1985
Test method for electrical insulating laminated pipes
DL 409—1991
Safety work regulations for the electric industry
JB/T8150.2—1995Epoxy laminated glass cloth tubeQJ502—1980Technical conditions for aluminum alloy and copper alloy forgingsYH 3205—1980
General technical conditions for mechanical assembly
YB3206-—1980
YB 3207-1980
YB3212-—1980
IEC 855:1985
3Definitions
General technical conditions for machining
General technical conditions for forgings
General technical conditions for heat treatment
Live working with foam-filled insulating tubes and insulating rods (first edition) This standard adopts the following definitions.
3.1 Insulating Tigid Ladder is a general term for rigid insulating ladders with corresponding mechanical strength and electrical performance used by workers to climb during live working. 3.2 Extenrlilble insulating ladder: An insulating ladder that stands upright on the ground and is lifted vertically to the live body by sliding. 3.3 Insulating ladder: An insulating ladder that is assembled on the tower and can be extended horizontally to the live body. 3.4 Insulating ladder: An insulating ladder that is suspended on a conductor, ground wire or component. 3.5 Insulating cetiped ladder: An insulating ladder that is connected to the upper insulating pole and hung on the cross arm of the tower with an insulating tube with an appropriate number of nails at the lower end as the main body. 3.6 A-ladder with plat lnrm An insulating ladder standing on the ground in the shape of a "herringbone". Approved by the State Administration of Quality and Technical Supervision on December 17, 1998 and implemented on August 1, 1999
GB 17620—1998
3.7 Single-tube insulating ladder A single-tube ladder made of insulating material, equipped with insulating foot nails and stabilized by insulating wires. 4 Classification
Insulating ladders are divided into three categories: vertical ladders, horizontal ladders, and hanging ladders according to their force characteristics and the way they are used during operation. 4.1 Vertical ladders
Vertical, single-pole, herringbone ladders, right-angle ladders and insulating hard ladders with lifting functions. 4.2 Horizontal ladders
Insulating ladders or insulated workbenches that are extended horizontally or can be controlled to rotate in the same plane. 4.3 Hanging ladders Ladders
Insulated spider ladders and insulated hanging ladders that are connected in a suspended manner or can swing in a controlled manner. 5 Technical requirements
5.1 General requirements
5.1.1 The raw materials used to manufacture insulated rigid ladders should be inspected in advance. 5.1.1.1 When the insulating parts of insulated rigid ladders are made of insulating plates, pipes, profiles, and foam-filled pipes, they should comply with the provisions of JB/T8150.2 and [EC855] respectively.
5.1.1.2 Insulation The metal parts in the rigid ladder should be made of metal materials with the characteristics of high strength and light specific gravity. Generally, high-strength aluminum alloy materials should be used. If LC4 lead alloy materials are used, they should comply with the provisions of QJ502. 5.1.1.3 Due to the different functional characteristics of the insulating rigid ladder, the selection and inspection of the matching mechanism can be specified according to the specific design requirements of its structure, but the design principle must be to reduce the weight of the mechanism as much as possible under the premise of meeting the use requirements. 5.1.2 All parts made of diamond alloy materials in the insulating rigid ladder should be anodized on the surface, the surface of shaft steel parts should have an anti-expansion coating, and the processed surface of the insulating laminated material parts should be treated with insulating paint after the parts are formed. 5.1.3 After the parts of the insulating rigid ladder are processed and formed, the processed surfaces should be regular and flat. The surface roughness of the metal parts should not exceed 6.3. The insulating parts should meet the appearance requirements in 5.1.1.1. 5.2 Electrical performance indicators of insulating rigid ladders
5.2.110～220 The electrical performance, test items and standards of the insulated rigid ladder of 330~500kV voltage level shall be in accordance with the requirements of DL 409 and meet the requirements of Table 1.
Rated voltage
Test length
nin Withstand voltage,ky
Factory and type test
Power frequency flashover breakdown voltage,kV
Not less than
5.2.2 The electrical performance, test items and standards of the insulated rigid ladder of 330~500kV voltage level shall be in accordance with the requirements of DL409 and meet the requirements of Table 2.
Rated voltage
5.3 Mechanical performance indicators of insulated rigid ladder
Test length
GB 17620—1998
5 min Withstand voltage,kV
Factory and type test
5.3.1 The allowable upper load of the insulated rigid ladder is 800N. 5.3.2 Static load index of insulated hard ladder: 2.5 times the allowable operating load. 5.3.3 Dynamic load index of insulated hard ladder: 1.5 times the allowable working load. 5.4 Constraint requirements of insulated hard ladder
15 times operating impact withstand voltage, kv
Factory and type test
Except for supporting and hanging insulated hard ladders, horizontal ladders and vertical hard ladders should be equipped with appropriate insulated wires to constrain the ladder body to ensure that the hard ladder has a certain structural rigidity.
5.4.1 Arrangement of restraint wires for vertical ladders
Vertical ladders should be tied with wires during operation. There are no less than 10 insulated wires per layer, which are required to be evenly distributed on the circumference. For vertical ladders with a height of more than 8, wires should be tied, that is, the restraint position is at the top and middle of the ladder body. For multi-layer elevators, after the elevator is lifted, insulated wires should be set on each layer. The angle between the restraining wire of the vertical ladder and the ground is 30°~～45°. 5.4.2 Arrangement of restraining wires for horizontal ladders
There should be a hanging wire above the horizontal ladder during operation. Generally, a restraining insulating wire position should be added for every 2.5m increase in the horizontal extension length. The angle between the hanging wire and the vertical line should be less than or equal to 60°5.4.3 Arrangement of restraining wires for herringbone ladders
During the operation of herringbone ladders, the root of the ladder should be fixed+ to prevent sliding; if the ladder height exceeds 5Ⅱ, insulating wires should be installed on both sides of the ladder. 5.5 The appearance of each component of the insulated rigid ladder shall not have sharp edges and corners, and shall be rounded. 5.6 Assembly of various components of the insulated rigid ladder and overall assembly 5.6.1 The assembly of various components of the insulated rigid ladder shall be carried out strictly in accordance with the design requirements and comply with the provisions of YB3205. 5.6.2 The overall assembly of the insulated rigid ladder shall meet the design requirements. 6 Test methods
6.1 General test conditions
6.1.1 Collection of component samples
6.1.1.1. Sample collection of insulating material parts Each batch of insulating material parts must have a recent material certificate from the supplier of insulating materials before leaving the factory. If the original inspection date has exceeded 18 months, the parts must be re-sampled and inspected according to the insulating material product standards. The sampling method shall be carried out in accordance with the provisions of GB/T 5130, GB/T 5132, and IEC 855.
6.1.1.2 Sample collection of forgings
Sample collection of forgings shall be carried out in accordance with the provisions of YB3207. 6.1.1.3 Sampling or sampling of heat-treated parts Parts that are heat-treated in the same furnace are allowed to be sampled, and the number of samples to be sampled shall be in accordance with the provisions of YB3212: 6.1.1.4 Sampling method of insulating rigid ladder assembly All insulating skirts after assembly need to be subjected to mechanical and electrical tests in accordance with the provisions of this standard. 6.1.2 Preparation of samples
GE17620—1998
6.1.2.1 Preparation of samples of insulating parts shall be carried out in accordance with GB/T5130, GB/T5132 and IEC855. 6.1.2.2 Samples of metal parts shall be prepared in the finished state or samples retained during processing. 6.2 Electrical test
The high voltage test method shall be carried out in accordance with the provisions of GB311.1. 6.2.1 The insulating parts of the insulating rigid ladders with voltage levels of 10~220kV shall be subjected to 1min power frequency withstand voltage test and power frequency flashover breakdown test respectively. The power withstand voltage and flashover breakdown voltage values shall comply with the provisions of Table 1. 6.2.2 The insulating parts of the insulating rigid ladders with voltage levels of 330~500kV shall be subjected to 5min power withstand voltage test and 15 times operating impulse withstand test respectively. The power frequency withstand voltage value and the operation impulse withstand test voltage value shall comply with the provisions of Table 2, and the test is qualified if there is no breakdown or flashover. 6.3 Mechanical test of insulated hard ladder
6.3.1 Mechanical strength test of each component
After the components of the insulated hard ladder are processed and formed, a mechanical strength test shall be carried out. When conducting the mechanical strength test, the load action position and direction shall be the same as when the components are actually used. The mechanical strength test items and indicators shall comply with the requirements of the specific structural design in accordance with the provisions of 5.3 of this standard.
6.3.2 Mechanical exhaustion test of the insulated hard ladder assembly After the insulated hard ladder assembly is assembled or finished, a mechanical strength test shall be carried out, as shown in Figure 1. The loads applied to the insulated hard ladder are the allowable working load, dynamic load and static load. The applied loads and the action position and direction shall be the same as when the hard ladder is actually used. The basic stress state of various types of insulated hard ladders is shown in Figure 1.
6.3.2.1 Dynamic load strength test of insulated rigid ladder assembly Apply an external load of 1.5 times the allowable working load value to the sample, repeat it three times according to the actual operation process, and the test is qualified if all parts are intact, the movable parts move flexibly, and there is no jamming. 6.3.2.2 Static load strength test of insulated rigid ladder assembly Apply an external load of 2.5 times the allowable working load value to the sample. The loading speed of this load should be about slow rise, and impact loading is not allowed. The sample is under the maximum static test load for 5 minutes. After unloading, the insulated rigid ladder parts do not have permanent deformation and damage, and the supporting mechanism is intact and effective.
..com7 Inspection rules
Straight single pole delivery
GB 17620-1998
HEIHIAI
Lifting ladder
Figure 1 Basic stress state of various types of insulated rigid ladders7.1 Each insulated rigid ladder product before finalization must be type inspected according to this standard. The items included in the type inspection are the following tests specified in this standard: a) power frequency withstand voltage test of insulating parts; b) power frequency flashover breakdown test of insulating parts of 10~220kV voltage level insulated rigid ladders; c) 15 operation impulse withstand test of insulating parts of 330~500kV voltage level insulated rigid ladders; and mechanical property test of the insulated rigid ladder assembly. Insulated rigid ladder products should be subject to type inspection in the following situations: a) trial determination and appraisal of insulated rigid ladder products before production or when old products are transferred to other factories for production; b) when the rigid ladder structure has major changes after formal production; c) when the rigid ladder products are resumed after being discontinued for more than one year; d) when the national supervisory agency puts forward the requirement of routine inspection. 7.2 Factory Inspection
人字榜
All insulated rigid ladder products shall be inspected for appearance and dimensions every year before leaving the factory, and shall comply with the provisions of this standard and JB/T8150.2IEC855 for appearance and dimensions: Mechanical tests and factory electrical endurance tests of products shall be carried out and shall comply with the provisions of this standard: The assembly of each part shall comply with the provisions of YB3205. Processing inspection shall comply with the provisions of YB3206 and the requirements of its structural design drawings. 7.3 The receiving department of insulated rigid ladders has the right to inspect the products according to the provisions of this standard. If it is found that the products do not comply with the technical provisions of this standard, the products are unqualified and the receiving department has the right to return them. 8 Marking, packaging, transportation and storagewww.bzxz.net
8.1 Marking
8.1.1 Position of marking
GB 17620—1998
Each part of the insulated rigid ladder shall be marked. The mark should be located on the flat surface of the part; the mark on the edge part should be located on the outer surface of the metal parts at both ends.
8.1.2 Method of manufacturing the mark
Use thin lead plate as the material, mark the mark content on the front, and glue the back to the selected part of the outer surface of the hard ladder. 8.1.3 Content of the mark
The nameplate of the insulated hard ladder should be marked with the following content: tool name, voltage level, trademark, model, manufacturing date, manufacturer name. 8.2 Packaging
8.2.1 Packaging of the insulated hard ladder assembly
It should be packaged in layers using canvas cover, plastic cover, and wooden box. 8.2.2 The name of the manufacturer, the name of the product, the gross weight, net weight, and the ex-factory date should be marked on the packaging box. In addition, it is also necessary to mark "prevent damage", "put with care", "do not press", "do not touch", etc. 8.3 Transportation
Insulated hard ladders for live working should be placed in special tool bags, boxes or special tool carts during transportation to prevent moisture and damage. 8.4 Storage
Insulated hard ladders for live working should be stored in a well-ventilated, dehumidifying, clean and dry special room. If the storage period exceeds 12 months from the production date, the electrical performance test shall be carried out in accordance with this standard.2 Static load strength test of insulated rigid ladder assembly Apply an external load of 2.5 times the allowable working load value to the sample. The loading speed of this load should be about slow rise, and impact loading is not allowed. The sample lasts for 5 minutes under the maximum static test load. After unloading, the insulated rigid ladder is qualified if there is no permanent deformation and damage to the parts and the supporting mechanism is intact and effective.
..com7 Inspection rules
Straight single pole delivery
GB 17620-1998
HEIHIAI
Lifting ladder
Figure 1 Basic stress state of various types of insulated rigid ladders7.1 Each insulated rigid ladder product before finalization must be subjected to type inspection according to this standard. The items included in the type inspection are the following tests specified in this standard: a) power frequency withstand voltage test of insulating parts; b) power frequency flashover breakdown test of insulating parts of 10~220kV voltage level insulated rigid ladders; c) 15 operation impulse withstand test of insulating parts of 330~500kV voltage level insulated rigid ladders; and mechanical property test of the insulated rigid ladder assembly. Insulated rigid ladder products should be subject to type inspection in the following situations: a) trial determination and appraisal of insulated rigid ladder products before production or when old products are transferred to other factories for production; b) when the rigid ladder structure has major changes after formal production; c) when the rigid ladder products are resumed after being discontinued for more than one year; d) when the national supervisory agency puts forward the requirement of routine inspection. 7.2 Factory Inspection
人字榜
All insulated rigid ladder products shall be inspected for appearance and dimensions every year before leaving the factory, and shall comply with the provisions of this standard and JB/T8150.2IEC855 for appearance and dimensions: Mechanical tests and factory electrical endurance tests of products shall be carried out and shall comply with the provisions of this standard: The assembly of each part shall comply with the provisions of YB3205. Processing inspection shall comply with the provisions of YB3206 and the requirements of its structural design drawings. 7.3 The receiving department of insulated rigid ladders has the right to inspect the products according to the provisions of this standard. If it is found that the products do not comply with the technical provisions of this standard, the products are unqualified and the receiving department has the right to return them. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 Position of marking
GB 17620—1998
Each part of the insulated rigid ladder shall be marked. The mark should be located on the flat surface of the part; the mark on the edge part should be located on the outer surface of the metal parts at both ends.
8.1.2 Method of manufacturing the mark
Use thin lead plate as the material, mark the mark content on the front, and glue the back to the selected part of the outer surface of the hard ladder. 8.1.3 Content of the mark
The nameplate of the insulated hard ladder should be marked with the following content: tool name, voltage level, trademark, model, manufacturing date, manufacturer name. 8.2 Packaging
8.2.1 Packaging of the insulated hard ladder assembly
It should be packaged in layers using canvas cover, plastic cover, and wooden box. 8.2.2 The name of the manufacturer, the name of the product, the gross weight, net weight, and the ex-factory date should be marked on the packaging box. In addition, it is also necessary to mark "prevent damage", "put with care", "do not press", "do not touch", etc. 8.3 Transportation
Insulated hard ladders for live working should be placed in special tool bags, boxes or special tool carts during transportation to prevent moisture and damage. 8.4 Storage
Insulated hard ladders for live working should be stored in a well-ventilated, dehumidifying, clean and dry special room. If the storage period exceeds 12 months from the production date, the electrical performance test shall be carried out in accordance with this standard.2 Static load strength test of insulated rigid ladder assembly Apply an external load of 2.5 times the allowable working load value to the sample. The loading speed of this load should be about slow rise, and impact loading is not allowed. The sample lasts for 5 minutes under the maximum static test load. After unloading, the insulated rigid ladder is qualified if there is no permanent deformation and damage to the parts and the supporting mechanism is intact and effective.
..com7 Inspection rules
Straight single pole delivery
GB 17620-1998
HEIHIAI
Lifting ladder
Figure 1 Basic stress state of various types of insulated rigid ladders7.1 Each insulated rigid ladder product before finalization must be subjected to type inspection according to this standard. The items included in the type inspection are the following tests specified in this standard: a) power frequency withstand voltage test of insulating parts; b) power frequency flashover breakdown test of insulating parts of 10~220kV voltage level insulated rigid ladders; c) 15 operation impulse withstand test of insulating parts of 330~500kV voltage level insulated rigid ladders; and mechanical property test of the insulated rigid ladder assembly. Insulated rigid ladder products should be subject to type inspection in the following situations: a) trial determination and appraisal of insulated rigid ladder products before production or when old products are transferred to other factories for production; b) when the rigid ladder structure has major changes after formal production; c) when the rigid ladder products are resumed after being discontinued for more than one year; d) when the national supervisory agency puts forward the requirement of routine inspection. 7.2 Factory Inspection
人字榜
All insulated rigid ladder products shall be inspected for appearance and dimensions every year before leaving the factory, and shall comply with the provisions of this standard and JB/T8150.2IEC855 for appearance and dimensions: Mechanical tests and factory electrical endurance tests of products shall be carried out and shall comply with the provisions of this standard: The assembly of each part shall comply with the provisions of YB3205. Processing inspection shall comply with the provisions of YB3206 and the requirements of its structural design drawings. 7.3 The receiving department of insulated rigid ladders has the right to inspect the products according to the provisions of this standard. If it is found that the products do not comply with the technical provisions of this standard, the products are unqualified and the receiving department has the right to return them. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 Position of marking
GB 17620—1998
Each part of the insulated rigid ladder shall be marked. The mark should be located on the flat surface of the part; the mark on the edge part should be located on the outer surface of the metal parts at both ends.
8.1.2 Method of manufacturing the mark
Use thin lead plate as the material, mark the mark content on the front, and glue the back to the selected part of the outer surface of the hard ladder. 8.1.3 Content of the mark
The nameplate of the insulated hard ladder should be marked with the following content: tool name, voltage level, trademark, model, manufacturing date, manufacturer name. 8.2 Packaging
8.2.1 Packaging of the insulated hard ladder assembly
It should be packaged in layers using canvas cover, plastic cover, and wooden box. 8.2.2 The name of the manufacturer, the name of the product, the gross weight, net weight, and the ex-factory date should be marked on the packaging box. In addition, it is also necessary to mark "prevent damage", "put with care", "do not press", "do not touch", etc. 8.3 Transportation
Insulated hard ladders for live working should be placed in special tool bags, boxes or special tool carts during transportation to prevent moisture and damage. 8.4 Storage
Insulated hard ladders for live working should be stored in a well-ventilated, dehumidifying, clean and dry special room. If the storage period exceeds 12 months from the production date, the electrical performance test shall be carried out in accordance with this standard.
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