JY TT-35/630A European front fittings

Share to:

I. Product Overview

The JY TT-35/630A European front fittings are a fully shielded, detachable cable connector specifically designed for 35kV, 630A power cables. It is integrally injection molded from EPDM rubber and features full insulation, full sealing, and touch-sensitive characteristics. It is mainly used for cable connections in 35kV European-style ring main units, cable branch boxes, and prefabricated substations, providing safe and reliable electrical connections and protection for 35kV power systems.

II. Product Characteristics

1. Insulation and electrical properties

Made of high-quality EPDM rubber through integral injection molding, it has excellent insulation properties and can withstand the working voltage of a 35kV system. Its power frequency withstand voltage and impact withstand voltage performance meet industry standards, ensuring electrical connection safety.
With a built-in semi-conductive shielding layer and uniform electric field distribution, it eliminates the risk of partial discharge caused by electric field concentration and improves long-term operational reliability.
With a fully sealed structure and IP67 protection rating, it effectively prevents moisture, dust, and oil from entering, making it suitable for harsh environments such as humid and dusty conditions and ensuring stable electrical connections.

2. Installation and Construction Characteristics

The detachable plug-in design makes installation convenient and requires no special tools. It connects directly to the equipment through a standard interface, allowing for fast construction, significantly reducing installation time and costs.
It adopts standardized interfaces and is compatible with 35kV/630A European-style ring main units, cable branch boxes and other equipment. It has strong versatility, good interchangeability and facilitates equipment maintenance and expansion.
The fully insulated, touchable structure ensures that the connector surface is grounded after installation, with no exposed live parts, eliminating the need for additional insulation protection and guaranteeing 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, embrittlement or deformation. It is suitable for various indoor and outdoor scenarios.
It is resistant to aging, ultraviolet rays, and ozone corrosion, with a service life of over 20 years. It requires no maintenance and reduces subsequent operation and maintenance costs.
It is resistant to chemical corrosion and can adapt to harsh environments such as humidity, dust, salt spray, and mild acid and alkali. It has no risk of corrosion or degradation and is suitable for industrial and mining enterprises, coastal areas and other scenarios.

4. Mechanical and Safety Characteristics

Rubber materials have high mechanical strength, are tear-resistant and tensile-resistant, and can withstand mechanical stress during construction and operation without the risk of breakage or cracking.
It features anti-misoperation and anti-electric shock designs, automatically grounds after installation, and has a touchable connector surface, ensuring high safety and making it suitable for power distribution scenarios where personnel frequently come into contact with it.
With its compact structure and small size, it is suitable for installation in confined spaces and has no installation space limitations.

III. Technical Parameters

Parameter categories	project	Technical indicators
Electrical parameters	Applicable system voltage	35kV AC
	Rated current	630A
	Power frequency withstand voltage (5min)	95kV, non-breakdown
	Impact resistance (peak)	200kV, non-breakdown
	Insulation resistance	≥1000MΩ
	Partial discharge quantity	≤5pC (at 1.5 times rated voltage)
Structural and material parameters	Main material	Ethylene propylene diene monomer (EPDM) rubber
	Applicable cable cross-section	25mm²~400mm² (select according to specifications)
	Protection level	IP67
	Structural form	Fully shielded detachable European-style front connector
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, and GB/T 11022 “Common Technical Requirements for High Voltage Switchgear and Controlgear Standards”

IV. Scope of Application

Applicable voltage level : 35kV AC power system.
Applicable scenarios :
Cable connections for European-style ring main units, cable branch boxes, and prefabricated substations;
35kV cable distribution systems for urban power grids, industrial and mining enterprises, and commercial buildings;
Cable terminal connections for various indoor and outdoor scenarios;
Power distribution scenarios where personnel frequently come into contact with the equipment, and locations with high safety requirements.
Function and application : Provides safe and reliable electrical connection for 35kV/630A power cables and European-style power distribution equipment. It features full insulation, full sealing, and touchability to ensure the safe and stable operation of the power distribution system and avoid safety accidents caused by insulation failure, poor sealing, and electric shock risk.

V. Usage Conditions

1. Normal operating conditions

Altitude: ≤2000m;
Ambient temperature: -40℃ to +90℃; cable operating temperature shall not exceed the conductor’s long-term allowable operating temperature.
Relative humidity: ≤100% (no condensation);
Environmental conditions: No corrosive gases, no flammable or explosive media, no severe vibration or impact;
Installation method: plug-in installation, directly connected to the equipment through a standard interface, and the installation space must meet the bending radius requirements of the connector.

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;
Scenarios requiring non-standard cable cross-sections and special protection levels.

VI. Installation and Maintenance

1. Installation Requirements

Before installation, inspect the product appearance. Ensure that the connectors are free of cracks, damage, and bubbles, and that all accessories are complete and undamaged.
Cut the cable according to the process requirements. The cutting length must meet the joint specifications. Avoid damaging the cable insulation layer during the cutting process. After cutting, clean the cable surface to remove oil and dust and ensure that the surface is dry and clean.
After crimping the cable conductor to the terminal, insert it into the connector, adjust the position to ensure a reliable connection, and then directly plug and unplug the connector to the equipment interface to ensure proper installation.
After installation, check that the connectors are secure, without looseness or misalignment, and that the grounding connection is good. Once confirmed to be correct, the installation is complete.

2. Maintenance Requirements

Regularly inspect the appearance of the connectors, ensuring there are no cracks, damage, discharge marks, or dirt accumulation. The connectors should be tightly connected to the equipment without looseness or gaps.
Regularly test the insulation resistance and contact resistance of the joints to ensure that the performance meets the requirements and to promptly identify potential problems.
Clean the surface of the connector to remove dust and dirt, and keep the surface dry and clean to avoid corrosion from oil and chemicals.
If any abnormalities such as cracks, damage, discharge, excessive insulation resistance, or excessive contact resistance are found in the joint, the joint must be replaced in time. Operation with defects is strictly prohibited.

VII. Precautions

The product must be installed, debugged, and maintained by professionals with high-voltage electrical installation qualifications. Operation by non-professionals is strictly prohibited.
The product must be used with 35kV/630A power cables and European-style power distribution equipment of the corresponding cross-section. It is strictly forbidden to use the wrong cable or equipment of different specifications, otherwise it will lead to connection failure and cause safety accidents.
The product must not be disassembled or modified without authorization, otherwise the warranty and safety guarantee will be lost. It is strictly forbidden to forcibly stretch or cut the joints to avoid damaging the rubber material.
During installation, cables must be stripped and terminals crimped according to process requirements to avoid damaging the cable insulation layer and to ensure that the connectors are installed in place and the connection is reliable.
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 connector.
During operation, the condition of the joints should be checked regularly to avoid external pressure or collisions, and to prevent joint damage and seal failure.

VIII. Model Description

Model Identification	meaning
JY	Corporate Logo (Synthesis)
TT	Product type identification (front connector)
35	Applicable system voltage level: 35kV
630A	Rated current, 630A
European front connector	Product type identification: European-style fully shielded detachable front connector

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 (Um=36kV) and above 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)” and GB/T 11022 “Common technical requirements for high voltage switchgear and controlgear standards”;
The product has passed the type test of the National Wire and Cable Quality Supervision and Inspection Center and meets the national power industry standards.

X. 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.