JY QJT-600 15kV/24kV 600A T-shaped American front connector

Scope of Delivery T-shaped American frontconnector, tespointcap,grounding wireInsulator Covering cap Conductor Cable Lug Adaptor Two-head Screw Socket wrench Silicone Lubricant, Clearing Paper Installation Instruction Sheet Quality Certificate

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I. Product Overview

The JY QJT-600 15kV/24kV 600A T-shaped American front connector is a standard American non-load-breaking cable accessory designed specifically for 15kV/24kV (10kV/20kV level) medium-voltage power distribution systems. It features a fully insulated, fully sealed, touch-sensitive T-shaped structure and serves as the front-end connection between cable lines and power distribution equipment. It achieves an insulated and sealed connection between the equipment bushing and the two cables, while also providing line branching, conductive connection, and grounding protection functions. It is widely used in American-style ring main units, prefabricated substations, cable branch boxes, and other equipment, and is a key component in constructing interfaces for American-style medium-voltage power distribution systems.

II. Product Characteristics

1. Electrical and insulation properties

Made of high-purity EPDM ethylene propylene diene monomer rubber through integral injection molding, it has no seams or air gaps, excellent insulation performance, can withstand the rated voltage of 15kV/24kV system and short-time overvoltage, meets the operating requirements of the maximum working voltage of 17.5kV/24kV, and has sufficient insulation margin.
With an internal electric field optimization structure and stress control layer, the electric field is evenly distributed, effectively suppressing partial discharge. There is no risk of electrical erosion or breakdown during long-term operation, and the partial discharge amount is ≤10pC (1.5U₀).
It features built-in large-section copper conductive components, excellent conductivity, low contact resistance, can carry a rated current of 600A, generates little heat during long-term operation, and has strong corrosion and oxidation resistance, making it suitable for high-current power distribution scenarios.
It has a built-in grounding connection structure, which can achieve reliable grounding, effectively release fault current and induced voltage, and can be equipped with a live display device to intuitively monitor the live status and eliminate the risk of misoperation.

2. Structural and Safety Features

With a fully insulated, fully sealed, and touch-accessible structure, the outer layer has high insulation strength, allowing direct contact with the outer casing during operation without the risk of electric shock, thus ensuring the safety of maintenance personnel.
The T-type three-port integrated design is compatible with the American 15kV/24kV 600A standard interface. One end connects to the equipment bushing, and the two ends connect to the cable accessories, realizing “one in and two out” line branches. It has a compact structure, is easy to install, and requires no additional adapters.
The design prevents mis-insertion and incorrect connection. The interface size strictly matches the American standard accessories and can only be matched with accessories of the corresponding specifications, preventing the mixing of accessories of different specifications. It has a built-in positioning and locking structure to prevent loosening and falling off after installation.
Equipped with a built-in operating ring and compatible with a dedicated insulated operating rod, it enables safe plug-and-play operations and improves the convenience of operation and maintenance.

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 underground, humid, and dusty conditions, and is not afraid of rain or condensation corrosion.
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.
It is compatible with American 15kV/24kV 600A standard equipment bushing interfaces and can be interchanged with American elbow cable joints, bushing seats and insulating caps of the same specifications, making it highly versatile.
The interface is standardized and conforms to IEEE 386 and relevant domestic standards. It can be adapted to the bushing interface of mainstream American 15kV/24kV power distribution equipment to realize the connection between equipment and cable and the branching of lines.

III. Technical Parameters

Parameter categories	project	Technical indicators
Rated electrical parameters	Rated voltage (Ue)	15kV/24kV (Applicable to 10kV/20kV systems, maximum operating voltage 17.5kV/24kV)
	Rated current (Ie)	600A
	Rated frequency (fn)	50Hz/60Hz
	Power frequency withstand voltage	42kV/5min (15kV dry test), 65kV/5min (24kV dry test), no breakdown, no flashover.
	Lightning impulse withstand voltage	95kV (15kV peak) and 125kV (24kV peak), no breakdown and no flashover.
	Partial discharge quantity	≤10pC (below 1.5U₀)
	Rated short-circuit withstand current	20kA/2s (25kA/2s optional, depending on system requirements)
	Contact resistance	≤50μΩ
Structural and material parameters	Main material	EPDM (ethylene propylene diene monomer) rubber (insulating layer), tin-plated copper (conductive contacts)
	Protection level	IP67
	Interface Standard	1 input terminal (US standard 15kV/24kV 600A equipment bushing interface), 2 output terminals (US standard 15kV/24kV 600A cable accessory interface)
	grounding method	It has a built-in grounding connection terminal and can be directly grounded.
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		IEEE 386, GB/T 12706, DL/T 404, GB/T 11022

IV. Scope of Application

Applicable voltage levels : 10kV/ 15kV/20kV/ 24kV AC medium voltage power distribution systems, compatible with American-style equipment bushing interfaces with a maximum operating voltage of 17.5kV/24kV.
Applicable equipment scenarios :
Bushing interfaces for 15kV/24kV American-style ring main units, prefabricated substations, cable branch boxes, American-style prefabricated transformers and other power distribution equipment, enabling the connection of equipment with two cables and the branching of lines;
Used in conjunction with American-style elbow cable joints, sleeve seats, and insulating caps to construct complete detachable cable terminals and line branch interfaces;
Urban power distribution network cable lines, power distribution systems for industrial and mining enterprises, and American-style power distribution equipment interfaces for new energy (photovoltaic/wind power) substations;
Front-end connection of American-style power distribution equipment in various scenarios such as indoor/outdoor power distribution rooms, underground utility tunnels, and cable tunnels.
Function and Purpose : To achieve the insulation and sealing connection of bushings and two cable accessories in American-style power distribution equipment, and to provide grounding protection, insulation isolation and line branching functions, providing a safe and reliable front-end connection solution for American medium-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: Compatible with standard American equipment sleeve interface, horizontal/vertical installation is acceptable, and the installation space must meet the operation requirements of two accessories.

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 American equipment sleeve 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 grounding terminals are intact and free of rust, and that all accessories are complete.
Clean the surface of the equipment sleeve interface to remove oil, dust, and foreign objects, ensuring the interface is dry and clean.
Apply a dedicated silicone grease lubricant evenly to the inner wall of the input end of the T-type front connector to avoid damaging the insulation layer during installation.
Slowly push the connector into the equipment sleeve interface to ensure it is fully in place and lock the positioning structure; connect the grounding terminal to the grounding grid, and the grounding resistance should be ≤4Ω.
The two output terminals are connected to the corresponding American elbow cable connectors, insulating caps and other accessories to ensure that the accessories are installed in place and the anti-detachment device is locked.
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 connectors, ensuring there are no cracks, discharge marks, or dirt accumulation, and that the grounding terminals and both accessories are securely connected without loosening.
Regularly test the insulation resistance to ensure that the performance meets the requirements and to detect potential faults in a timely manner.
Clean the surface of the connector to remove dust and dirt, and keep the insulation surface dry and clean to avoid corrosion from oil and chemicals.
If any abnormalities such as cracks, damage, discharge, or overheating occur in the connector or accessories, stop using them immediately and replace them. It is strictly forbidden to operate them while they are malfunctioning.
Special insulated tools must be used for plugging and unplugging accessories. It is strictly forbidden to operate live connectors by hand. Power distribution safety regulations must be strictly followed during operation.

VII. Precautions

The product must be installed, debugged, and maintained by professional electrical personnel with medium-voltage power distribution construction qualifications. Operation by non-professional personnel is strictly prohibited.
The product must be used with American-style equipment conduits and cable accessories of the corresponding specifications. It is strictly forbidden to use interfaces of different voltage or current levels, otherwise it will lead to insulation failure and safety accidents.
The connector must not be disassembled or modified without authorization, otherwise the warranty and safety guarantee will be lost. It is strictly forbidden to use non-special tools to forcibly install or disassemble the connector.
It is strictly forbidden to connect accessories of different voltage or current levels to the two output terminals at the same time. They must be used in accordance with the system parameters.
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.
When operating accessories on live circuits, it is essential to strictly adhere to power distribution safety regulations, implement appropriate safety precautions, and strictly prohibit any unauthorized operations.

VIII. Model Description

Model Identification	meaning
JY	Product series code
QJT	T-type American front connector series code
□	Voltage levels (15/24, representing 15kV/24kV respectively)
600	Rated current rating, compatible with 600A current rating
T-shaped American front connector	T-type American-style front connector, used for cable connections and line branching accessories for American-style power distribution equipment conduit interfaces.

IX. Implementation Standards and Certification

International Standard: IEEE 386 “Medium Voltage Detachable Cable Connector Standard”;
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.

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.