JY NZ-35(40.5)-□ 35kV Inner cone plug-in terminal

I. Product Overview

The JY NZ-35 (40.5)-□ 35kV inner cone plug-in terminal is a detachable cable terminal specifically designed for 35kV (Um=40.5kV) high-voltage power distribution systems. It features an inner cone plug-in structure and can be directly used with #1/#2/#3 inner cone insulated sockets. This enables insulation isolation, conductive connection, and sealing protection between cables and power distribution equipment (switchgear, ring main units, prefabricated substations). No on-site gas or insulating oil treatment is required. It is easy to install and highly efficient to maintain, making it a key component in constructing detachable cable interfaces for high-voltage power distribution systems.

II. Product Characteristics

1. Electrical and insulation properties

• Made of high-purity silicone rubber through integral injection molding, it is seamless and air-gap free, with excellent insulation performance. It can withstand the rated voltage of 35kV system and short-time overvoltage, and meet the operating requirements of the maximum working voltage of 40.5kV. It has sufficient insulation margin and partial discharge ≤10pC (1.5U₀).
• With a built-in electric field optimization structure and stress control layer, the electric field is evenly distributed, effectively suppressing partial discharge. There is no risk of electrolytic corrosion or breakdown during long-term operation, and the insulation performance is stable and reliable.
• Built-in copper/aluminum conductive inserts provide excellent conductivity, low contact resistance, and the ability to carry rated current of the corresponding current rating. They also generate little heat during long-term operation and have strong corrosion and oxidation resistance.
• The insulating surface is treated with a special process, resulting in high surface resistivity and strong hydrophobicity. This effectively prevents surface flashover caused by condensation and dirt, improving insulation reliability in harsh environments.

2. Structural and Safety Features

• The standardized internal cone plug-in interface design strictly complies with GB/T 12706 and IEC 60840 standards, and is interchangeable with 1#/2#/3# internal cone insulated sockets, with strong compatibility and adaptability to different specifications of power distribution equipment interfaces.
• With its integrated structural design, the front end features an inner cone interface, while the rear end is a cable connection terminal. During installation, it can be directly inserted into the matching socket without the need for additional tools, making on-site installation convenient and significantly shortening the construction cycle.
• The design prevents mis-insertion and incorrect connection. The interface size is uniquely matched and can only be used with sockets of the corresponding specifications, preventing the use of accessories of different specifications. It has a built-in positioning and locking structure to prevent loosening and falling off after installation.
• With a fully insulated, touchable structure and high outer insulation strength, the outer casing can be directly touched during operation without the risk of electric shock, ensuring the safety of maintenance personnel.

3. Environmental and Weather Resistance

• It has excellent weather resistance and can adapt to a wide temperature range of -40℃ to +90℃. The elasticity and insulation properties of the rubber do not decrease under high and low temperatures, and there is no risk of cracking or embrittlement. It is suitable for various outdoor and indoor scenarios.
• Moisture-proof, waterproof, stain-proof, and salt spray-proof, with an IP67 protection rating, it can operate stably for a long time in harsh environments such as humid, dusty, and salt spray conditions, and is not afraid of rain or condensation.
• It is resistant to aging, ultraviolet rays, and ozone corrosion, with a service life of over 30 years. It requires no maintenance and reduces subsequent operation and maintenance costs.

4. Mechanical and Adaptation Characteristics

• It has high mechanical strength, is impact and vibration resistant, and can withstand mechanical stress during transportation, installation and operation without deformation or damage risk. Its seismic resistance level reaches level 8.
• Available in three sizes: #1, #2, and #3, suitable for power distribution equipment and cables of different voltage and current levels, offering strong versatility.
• The modular design allows for individual plug-and-play replacement, enabling accessory maintenance without power outages, significantly improving operational efficiency and reducing power outage losses.

III. Technical Parameters

Parameter categories	project	Technical indicators
Rated electrical parameters	Applicable system voltage (Un)	35kV
	Rated voltage (Ue)	35kV
	Maximum operating voltage (Um)	40.5kV
	Rated frequency (fn)	50Hz/60Hz
	Power frequency withstand voltage	95kV/5min (dry test), no breakdown, no flashover
	Lightning impulse withstand voltage	200kV (peak value), no breakdown, no flashover
	Partial discharge quantity	≤10pC (below 1.5U₀)
	Rated current rating	630A/1250A (Multiple specifications available)
	Rated short-circuit withstand current	20kA/2s, 25kA/2s, 31.5kA/2s (optional)
	Contact resistance	≤50μΩ
Structural and material parameters	Main material	EPDM (ethylene propylene diene monomer) rubber (insulating layer), copper/aluminum tin plating (conductive inserts)
	Protection level	IP67
	Interface Standard	Internal conical interface, conforming to GB/T 12706 and IEC 60840 standards.
	Specifications series	1#, 2#, 3# (suitable for different currents/cable cross-sections)
	Matching socket	1#/2#/3# Inner cone insulated socket
Environmental parameters	Applicable altitude	≤2000m (Customization available for high altitudes)
	Ambient temperature	-40℃/ +90℃ (operating temperature), -40℃/ +70℃ (storage temperature)
	relative humidity	≤100% (no condensation)
	Seismic resistance level	Level 8
Implementation Standards		GB/T 12706, IEC 60840, GB/T 11022, DL/T 404

IV. Scope of Application

1. Applicable voltage level : 35kV AC high voltage power distribution system, compatible with power distribution equipment with a maximum operating voltage of 40.5kV.
2. Applicable equipment scenarios :
3. The cable inlet and outlet interfaces of power distribution equipment such as 35kV switchgear, ring main unit, and prefabricated substation are used in conjunction with the #1/#2/#3 inner cone insulated sockets;
4. 35kV cable lines for urban power distribution networks, power distribution systems for industrial and mining enterprises, and power distribution equipment interfaces for new energy (photovoltaic/wind power) booster stations;
5. Cable terminal installation for high-voltage power distribution equipment in various scenarios such as indoor/outdoor power distribution rooms, underground utility tunnels, and cable tunnels.
6. Function and application : To achieve insulation isolation, conductive connection and sealing protection of 35kV cables and power distribution equipment, without the need for on-site gas or insulating oil treatment, and to provide a safe, reliable and easy-to-install detachable cable terminal solution for high-voltage power distribution systems.

V. Usage Conditions

1. Normal operating conditions

• Altitude: ≤2000m;
• Ambient temperature: -40℃~+90℃; equipment operating temperature complies with relevant standards.
• Relative humidity: ≤100% (no condensation);
• Environmental conditions: No corrosive gases, no flammable or explosive media, no severe vibration or impact;
• Installation method: Directly insert into the matching inner cone insulated socket. Horizontal or vertical installation is acceptable. The installation space must meet the requirements for insertion and removal.

2. Special usage conditions (customization required)

• The altitude exceeds 2000m;
• The ambient temperature exceeds the range of -40℃ to +90℃;
• Severely polluted, salt spray, and chemically corrosive environments;
• High vibration and high impact conditions;
• Non-standard cable cross-sections and special interface specifications;
• Special grounding requirements and high pollution levels.

VI. Installation and Maintenance

1. Installation Requirements

• Before installation, inspect the product appearance for cracks, damage, bubbles, and undamaged insulation surfaces; check that the conductive inserts are intact, free from rust and deformation.
• Clean the inner wall of the matching inner cone insulated socket and the surface of the terminal interface to remove oil, dust, and foreign objects, and ensure that the interface is dry and clean.
• Apply a dedicated silicone grease lubricant evenly to the outer wall of the terminal interface to avoid damaging the insulation layer during installation.
• Slowly push the terminal into the matching socket to ensure it is fully in place, lock the positioning anti-dislodgement device, and ensure that there is no looseness or tilting after installation.
• After installation, insulation resistance and power frequency withstand voltage tests are conducted. Only after passing these tests can the equipment be put into operation.

2. Maintenance Requirements

• Regularly inspect the appearance of the terminal to ensure there are no cracks, discharge marks, or dirt accumulation, that the connection to the socket is secure and not loose, and that the seals are not aged or damaged.
• Regularly test the insulation resistance to ensure that the performance meets the requirements and to detect potential faults in a timely manner.
• Clean the terminal surface to remove dust and dirt, keep the insulation surface dry and clean, and avoid corrosion from oil and chemicals.
• If any abnormalities such as cracks, damage, discharge, or overheating occur in the terminal or its socket, it should be stopped immediately and replaced. Operation with defects is strictly prohibited.
• Special insulated tools must be used for plugging and unplugging terminals. It is strictly forbidden to operate live terminals with bare hands. Power distribution safety regulations must be strictly followed during operation.

VII. Precautions

1. The product must be installed, debugged, and maintained by professional electrical personnel with high-voltage power distribution construction qualifications. Operation by non-professional personnel is strictly prohibited.
2. The product must be used with an inner cone insulated socket of the corresponding specification. It is strictly forbidden to use sockets of different voltage levels or specifications, otherwise it will lead to insulation failure and safety accidents.
3. Terminals must not be disassembled or modified without authorization, otherwise the warranty and safety guarantee will be lost. It is strictly forbidden to use non-specialized tools to forcibly install or disassemble them.
4. During installation, it is strictly forbidden to damage the insulating surface. The silicone grease lubricant must be applied evenly to avoid affecting the insulation performance and sealing effect.
5. When storing, it should be placed in a dry, ventilated, and cool environment, avoiding direct sunlight, high temperature, humidity, and compression. It is strictly forbidden to contact with sharp objects that may damage the insulation layer.
6. When plugging or unplugging terminals while they are powered on, it is essential to strictly adhere to power distribution safety regulations, take appropriate safety precautions, and strictly prohibit any unauthorized operations.

VIII. Model Description

Model Identification	meaning
JY	Product series code
NZ	Internal Cone Plug-in Terminal Series Code
35 (40.5)	Applicable system voltage levels: rated voltage 35kV, maximum operating voltage 40.5kV.
□	Specification series (1#/2#/3#, suitable for different current/cable cross-section grades)
35kV inner cone plug-in terminal	35kV internal cone pluggable cable terminal, which can be directly plugged into and installed with the matching internal cone socket.

IX. Implementation Standards and Certification

• International Standard: IEC 60840 “Test methods and requirements for extruded insulated power cables and their accessories with rated voltages of 30kV and above (Um=36kV) up to 150kV (Um=170kV)”;
• National standards: GB/T 12706 “Extruded insulated power cables and accessories with rated voltage of 1kV (Um=1.2kV) to 35kV (Um=40.5kV)”, GB/T 11022 “Common technical requirements for high voltage switchgear and controlgear standards”, DL/T 404 “3.6kV~40.5kV AC metal-enclosed switchgear and controlgear”;
• The product has passed the type test of the National High Voltage Electrical Apparatus Quality Supervision and Inspection Center and meets national electrical safety standards.

10. After-sales service

• Product warranty period: 18 months from the date of manufacture, or 12 months from the date of commissioning (whichever comes first).
• During the warranty period, products will be repaired or replaced free of charge if quality issues arise.
• We provide technical support, installation guidance, and customized services (adaptation to special specifications and working conditions).

Document Description

The technical parameters in this manual are based on standard operating conditions. Special operating conditions need to be customized according to actual needs. The final specifications shall be subject to the product technical agreement and type test report.

Appendix: Product outline diagram