JY JCTG-15kV 600A American Integrated Dead break Bushing

I. Product Overview

The JY JCTG-15kV 600A American integrated dead break bushing is a standard American-style integrated insulating bushing designed specifically for 15kV (10kV level) medium-voltage power distribution systems. It is made using epoxy resin casting and functions as both an equipment mounting base and a cable accessory interface. It can be directly installed on the housings of American-style transformer substations, ring main units, cable branch boxes, etc., serving as a connection base for accessories such as elbow cable joints, surge arresters, and insulating caps. It achieves insulation isolation, conductive connection, and sealing protection between equipment and cable accessories, and is a core component for constructing separable interfaces in American-style medium-voltage power distribution systems.

II. Product Characteristics

1. Electrical and insulation properties

• It is integrally cast with high-purity epoxy resin , without seams or air gaps, with excellent insulation performance. It can withstand the rated voltage of 15kV system and short-time overvoltage, and meet the operating requirements of the maximum working voltage of 17.5kV, with sufficient insulation margin.
• With a built-in optimized electric field structure, 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 (below 1.5U₀).
• With built-in copper conductive inserts, it has 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 improve system safety.

2. Structural and Safety Features

• The integrated composite structure design features a standard American 15kV 600A interface at the front end and a flange mounting structure at the rear end, which can be directly fixed to the equipment housing to achieve integrated insulation connection between the equipment and cable accessories.
• 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.
• With its own rubber sealing structure and IP67 protection rating, it can achieve sealed isolation between the equipment and accessories, preventing moisture and dust from entering and improving the system’s moisture-proof and waterproof performance.
• Designed to prevent misconnection and loosening, the interface size strictly matches American standard accessories, and can only be matched with accessories of the corresponding specifications, eliminating the risk of misconnection, loosening and falling off.

3. Environmental and Weather Resistance

• With excellent weather resistance, it can adapt to a wide temperature range of -40℃ to +90℃. The performance of epoxy resin and rubber does not degrade under high and low temperatures, and there is no risk of cracking or embrittlement. It is suitable for various outdoor and indoor scenarios.
• It is moisture-proof, waterproof, stain-proof, and salt spray-proof, and can operate stably for a long time in harsh environments such as underground, damp, and dusty 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.
• The flange mounting structure is designed to fit the standard mounting holes of American power distribution equipment, making installation convenient and requiring no additional adapters.
• It is compatible with 15kV 600A American standard cable accessory interfaces and can be interchanged with elbow-type cable joints, surge arresters and insulating caps of the same specifications, with strong compatibility.

III. Technical Parameters

Parameter categories	project	Technical indicators
Rated electrical parameters	Applicable system voltage (Un)	10kV
	Rated voltage (Ue)	15kV
	Maximum operating voltage (Um)	17.5kV
	Rated current (Ie)	600A
	Rated frequency (fn)	50Hz/60Hz
	Power frequency withstand voltage	42kV/5min (dry test), no breakdown, no flashover
	Lightning impulse withstand voltage	95kV (peak value), no breakdown, 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	Epoxy resin (insulating layer), tin-plated copper (conductive inserts), rubber (sealing components)
	Protection level	IP67
	Interface Standard	Front end: 15kV 600A American standard cable accessory interface; Rear end: Flange mounting structure
	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

1. Applicable voltage level : 10kV AC medium voltage power distribution system, compatible with American power distribution equipment with a maximum operating voltage of 17.5kV.
2. Applicable equipment scenarios :
3. The housing mounting interface of 15kV American-style box-type substations, ring main units, cable branch boxes, and other power distribution equipment serves as the connection base for cable accessories;
4. It can be used in conjunction with 15kV 600A elbow-type cable joints, surge arresters, and insulating caps to form a complete detachable cable terminal and surge arrester interface;
5. 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;
6. Interface installation for American-style power distribution equipment in various scenarios such as indoor/outdoor power distribution rooms, underground utility tunnels, and cable tunnels.
7. Function and Application : As an integrated insulating connection base for American-style power distribution equipment and cable accessories, it realizes insulation, sealing, conductivity and grounding connection, providing a safe and reliable interface installation 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: The flange is fixedly installed on the equipment housing. It can be installed horizontally or vertically. The installation space must meet the operation requirements of the 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 flange mounting holes 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 conductive inserts and seals are intact and free from rust and aging.
• Clean the mounting surface of the equipment housing to remove oil, dust, and foreign objects, ensuring that the mounting surface is flat and clean.
• Align the sleeve flange with the mounting holes on the equipment housing, secure it firmly with the matching bolts, and install the sealing gasket to ensure a reliable flange surface seal.
• Connect the grounding terminal to the grounding grid, and the grounding resistance should be ≤4Ω.
• Apply special silicone grease lubricant evenly to the inner wall of the bushing front end interface, and then install the matching elbow joint, surge arrester and other accessories, ensuring that the accessories are installed in place and locking the anti-detachment device.
• 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 bushing; check for cracks, discharge marks, and dirt accumulation; ensure the grounding terminal connection is secure and not loose; and ensure the seals are free from aging or damage.
• 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 bushing to remove dust and dirt, and keep the insulation surface dry and clean to avoid corrosion from oil and chemicals.
• If the casing or its accessories show abnormalities such as cracks, damage, discharge, or overheating, 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

1. 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.
2. The product must be used with American standard cable accessories of the corresponding specifications. It is strictly forbidden to use accessories of different voltage or current ratings, otherwise it will lead to insulation failure and safety accidents.
3. The sleeve 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 accessories.
4. Flange mounting bolts must be tightened to the specified torque to prevent loosening that could lead to sealing failure or poor contact.
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 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
JCTG	American-style integrated sleeve series code
15kV	Applicable system voltage levels, maximum operating voltage 17.5kV
600A	Adapter interface current rating
Integral Dead Break Bushing	American-style integrated non-load-breaking insulating bushing, used as a cable accessory connection base for American power distribution equipment.

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.

Appendix: Product outline diagram