JY JDZT-15/200 15kV 200A Grounding Elbow

Scope of Delivery Grounding elbow Clearing paper Silicone lubricant Quality certificate

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I. Product Overview

The JY JDZT-15/200 15kV 200A Grounding Elbow is a detachable grounding accessory designed specifically for 15kV (10kV level) medium-voltage power distribution systems. It features a fully insulated, fully sealed, touch-sensitive elbow structure, compatible with 15kV 200A standard bushing interfaces. Integrating grounding cable and insulation protection, it can be directly connected to power distribution equipment interfaces for reliable grounding. Used for grounding protection during line maintenance and equipment upkeep, it is widely applied in ring main units, prefabricated substations, cable branch boxes, and other equipment, serving as a key component for ensuring operational safety in medium-voltage power distribution systems.

II. Product Characteristics

1. Electrical and grounding performance

The main body is integrally injection molded from high-purity EPDM ethylene propylene diene monomer rubber , with no seams or air gaps, excellent insulation performance, and can withstand the rated voltage of a 15kV system and short-time overvoltage, meeting the operating requirements of a 10kV system with a maximum operating voltage of 17.5kV, and has sufficient insulation margin.
With built-in copper conductive contacts and a dedicated grounding cable, it has excellent conductivity, can effectively carry fault current, achieve reliable grounding, has low grounding resistance, and can quickly release residual charge and fault current in the line.
The cable is made of flame-retardant cross-linked polyethylene insulated cable, which has excellent insulation performance, high mechanical strength, can withstand frequent bending and pulling, and has no risk of aging or cracking during long-term operation.
The fully sealed structure design and IP67 protection rating prevent moisture and dust intrusion, avoiding performance degradation caused by moisture and dirt accumulation in the grounding circuit.

2. Structural and Safety Features

The fully insulated, touchable structure has high outer insulation strength, allowing direct contact with the outer casing during operation without the risk of electric shock and eliminating the safety hazards of accidental contact with live interfaces.
The elbow-type interface is standardized and compatible with 15kV 200A standard bushing socket interfaces. It can be interchanged with elbow-type cable joints and bushing joints of the same specifications, making installation convenient and requiring no additional wiring.
It features a built-in anti-detachment structure and operating ring, which prevents loosening and falling off after installation. It is also compatible with a dedicated insulated operating rod, enabling live plug-in and unplugging operations and improving maintenance convenience.
The design prevents mis-insertion, with a unique interface size that can only be used with interfaces of the corresponding specifications, eliminating the risk of incorrect installation or connection.

3. Environmental and Weather Resistance

With excellent weather resistance, it can adapt to a wide temperature range of -40℃ to +90℃. The elasticity of the rubber and the insulation performance of the cable 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.
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 20 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 15kV 200A standard bushing socket interfaces and can be directly installed on the equipment bushings of ring main units, prefabricated substations, and cable branch boxes without the need for additional adapters.
The grounding cable length can be customized to suit different installation space requirements, making it highly versatile.

III. Technical Parameters

Parameter categories	project	Technical indicators
Rated electrical parameters	Applicable system voltage	10kV (maximum operating voltage 17.5kV)
	Rated current rating	200A (adapter interface current rating)
	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	16kA/2s (20kA/2s optional, depending on system requirements)
	Grounding cable specifications	Copper core cross-linked polyethylene insulated cable, ≥16mm² (customizable).
Structural and material parameters	Main material	EPDM (ethylene propylene diene monomer) rubber (insulation layer), tin-plated copper (conductive contacts), cross-linked polyethylene (cable insulation layer)
	Protection level	IP67
	Interface Standard	15kV 200A American standard bushing connector
	grounding method	It comes with a grounding cable and can be directly connected to the grounding grid.
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, GB/T 11022, DL/T 404, DL/T 621

IV. Scope of Application

Applicable voltage levels : 10kV~15kV AC medium voltage power distribution systems, compatible with equipment bushing interfaces with a maximum operating voltage of 17.5kV.
Applicable equipment scenarios :
The bushing interfaces of power distribution equipment such as 15kV ring main units, prefabricated substations, cable branch boxes, and American-style prefabricated substations serve as temporary grounding protection during line maintenance and equipment upkeep.
During cable line maintenance, the cable terminal interface should be grounded to discharge residual charge.
Operation and maintenance grounding of urban power distribution cable lines, power distribution systems of industrial and mining enterprises, and power distribution interfaces of new energy (photovoltaic/wind power) step-up substations;
Grounding protection for equipment interfaces in various scenarios such as indoor/outdoor power distribution rooms, underground utility tunnels, and cable tunnels.
Function and Purpose : To reliably ground the interfaces of power distribution equipment/cables, release residual charge and fault current, and ensure the personal safety of maintenance personnel, it is an essential safety accessory for the operation and maintenance of 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 15kV 200A bushing socket interface, horizontal/vertical installation is acceptable, and the installation space must meet the operation requirements.

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 equipment sleeve socket interface specifications;
Special short-circuit current requirements and long-distance grounding cable scenarios.

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 cable is intact, undamaged, and free from aging, and that all accessories are complete.
Clean the surface of the equipment sleeve socket 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 grounding elbow interface to avoid damaging the insulation layer during installation.
Slowly push the grounding elbow into the bushing socket interface to ensure it is fully in place and lock the positioning structure; reliably connect the end of the grounding cable to the grounding grid, with a grounding resistance ≤4Ω.
After installation, check the continuity of the grounding circuit to ensure reliable grounding and no poor contact.

2. Maintenance Requirements

Regularly inspect the appearance of the grounding elbow; check for cracks, discharge marks, and dirt accumulation; ensure the grounding cable is undamaged, unaged, and securely connected.
Regularly test the continuity and resistance of the grounding loop to ensure that the performance meets the requirements and to detect potential faults in a timely manner.
Clean the surface of the grounding elbow to remove dust and dirt, keep the insulating surface dry and clean, and avoid corrosion from oil and chemicals.
If any abnormalities such as cracks, damage, aging, or poor conductivity are found in the grounding elbow or grounding cable, it should be stopped immediately and replaced. Operation with defects is strictly prohibited.
Grounding elbow insertion and removal operations must be performed using dedicated insulated tools. It is strictly forbidden to operate live interfaces with bare hands. 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 the corresponding specification of equipment bushing socket. It is strictly forbidden to use interfaces with different voltage levels or different current levels, otherwise it will lead to insulation failure and safety accidents.
The grounding elbow 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 it.
The grounding cable must be reliably connected to the grounding grid with a grounding resistance of ≤4Ω. Otherwise, it will be unable to effectively release residual charge and fault current, posing a serious safety hazard.
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 to prevent damage to the insulation layer and cable.
When plugging or unplugging a grounding elbow while it is energized, the power distribution safety regulations must be strictly followed, safety precautions must be taken, and unauthorized operations are strictly prohibited.

VIII. Model Description

Model Identification	meaning
JY	Product series code
JDZT	Grounding Elbow Series Code
15	Applicable system voltage levels, maximum operating voltage 17.5kV
200	Adapter interface current rating
Grounding Elbow	Grounding elbow, a grounding accessory using a detachable elbow-type interface.

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 Voltages 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”, DL/T 621 “Grounding of AC Electrical Installations”;
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.