15kV Rear Plug Type Quick Plug
Product Overview
The 15kV Rear Plug Type Quick Plug is a rear-entry quick-disconnect connector designed specifically for 10kV/15kV medium-voltage power distribution systems. It is compatible with the rear-entry receptacles of ring main units, cable branch boxes, and similar equipment, and supports rapid mating with bypass operation devices and emergency generator vehicles. This connector enables live-line bypass operations and emergency power supply, making it a critical component for uninterrupted maintenance of medium-voltage distribution systems.
Product Features
Electrical and Insulation Performance
Manufactured from high-performance EPDM (Ethylene Propylene Diene Monomer) rubber via integral injection molding, the connector is seamless and void-free, delivering excellent insulation performance. It withstands the rated voltage of a 15kV system as well as transient overvoltages, meeting the operational requirements of a maximum working voltage of 17.5kV. Partial discharge level is ≤10pC (at 1.5U₀).
Built-in high-purity copper conductive contacts provide superior conductivity with low contact resistance. The connector is rated for 250A/630A continuous current, ensuring long-term operation free from heating and oxidation to meet high-current bypass power supply demands.
An integrated electric field optimization structure with a stress control layer ensures uniform electric field distribution at the interface, effectively suppressing partial discharge. Long-term operation presents no risk of electrical erosion or dielectric breakdown, ensuring stable and reliable insulation performance.
Structural and Safety Features
The standardized T-type rear-plug design strictly conforms to GB/T 12706 and IEC 60840 standards, offering full interchangeability with the rear-entry receptacles of mainstream 15kV ring main units and cable branch boxes for strong compatibility.
The integrated modular structure employs a quick-lock connection mechanism that requires no additional tools, enabling rapid mating and disconnection between equipment receptacles and bypass cables, significantly reducing the construction cycle for live-line operations.
A built-in positioning and anti-withdrawal structure automatically locks upon full connector insertion, preventing loosening or disengagement during operation. An integrated grounding connection structure provides reliable earthing, effectively dissipating induced voltages and fault currents to enhance system safety.
The fully insulated, touchproof construction features high outer insulation strength, allowing direct contact with the housing during live operation without risk of electric shock, ensuring the safety of operations and maintenance personnel.
Environmental and Weather Resistance
Excellent weather resistance allows operation across a wide temperature range of -40°C to +90°C. Rubber elasticity and insulation performance remain undiminished at extreme temperatures, with no risk of cracking or embrittlement, suitable for both outdoor and indoor applications.
Rated IP67 for protection against moisture, water ingress, dust, and salt spray, the connector is capable of stable long-term operation in harsh environments including high humidity, heavy dust, and salt-laden atmospheres, with no degradation from rain or condensation.
Resistant to aging, ultraviolet radiation, and ozone corrosion, the connector has a service life exceeding 30 years, requiring no maintenance and reducing long-term operating costs.
Mechanical and Compatibility Features
High mechanical strength with impact and vibration resistance allows the connector to withstand mechanical stresses encountered during transport, installation, and operation without deformation or damage. Seismic resistance rating: Grade 8.
Compatible with the rear-entry receptacles of 10kV/15kV ring main units, cable branch boxes, pad-mounted transformers, and similar equipment, offering broad universality and suitability for use with mainstream bypass cables, transfer cables, and current-diversion devices.
The modular design supports repeated insertion and withdrawal cycles for convenient maintenance, reducing equipment investment costs for live-line operations.
Technical Parameters
| Parameter Category | Item | Technical Specification |
| Rated Electrical Parameters | System Voltage (Un) | 10kV/15kV |
| | Rated Voltage (Ue) | 15kV | |
| | Maximum Working Voltage (Um) | 17.5kV | |
| | Rated Frequency (fn) | 50Hz/60Hz | |
| | Power-Frequency Withstand Voltage | 42kV/5min (dry), no breakdown, no flashover | |
| | Lightning Impulse Withstand Voltage | 95kV (peak), no breakdown, no flashover | |
| | Partial Discharge Level | ≤10pC (at 1.5U₀) | |
| | Rated Current Class | 250A/630A (selectable) | |
| | Rated Short-Circuit Withstand Current | 20kA/2s, 25kA/2s (selectable) | |
| | Contact Resistance | ≤50μΩ | |
| Structural and Material Parameters | Main Body Material | EPDM rubber (insulating housing); silver-plated/tin-plated copper (conductive contacts); stainless steel (locking mechanism) |
| | Protection Rating | IP67 | |
| | Interface Standard | Rear-entry T-type quick-plug interface, conforming to GB/T 12706 and IEC 60840 standards | |
| | Compatible Equipment | 10kV/15kV ring main units, cable branch boxes, bypass cables, transfer cables, etc. | |
| Environmental Parameters | Applicable Altitude | ≤2000m (high-altitude customization available) |
| | Ambient Temperature | -40°C to +90°C (operating); -40°C to +70°C (storage) | |
| | Relative Humidity | ≤100% (non-condensing) | |
| | Seismic Resistance Rating | Grade 8 | |
| Applicable Standards | GB/T 12706; DL/T 1476, Preventive Test Regulations for Electrical Safety Tools and Equipment; GB 3906, AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages from 3.6kV to 40.5kV |
Applications
Applicable voltage class: 10kV/15kV AC medium-voltage distribution systems; compatible with distribution equipment rated for a maximum working voltage of 17.5kV.
Applicable operating scenarios:
Rapid mating between rear-entry equipment receptacles and bypass cables during live-line inspection and renovation of 10kV/15kV ring main units, cable branch boxes, and other distribution equipment, establishing temporary bypass power supply circuits;
Live-line bypass operations on urban distribution network cable lines, industrial and mining enterprise power distribution systems, and distribution equipment at renewable energy (photovoltaic/wind power) step-up substations;
Emergency power supply and live-line maintenance operations on distribution equipment in indoor/outdoor distribution rooms and pad-mounted substations.
Functional purpose: To provide insulation isolation and conductive connection between the rear-entry receptacles of distribution equipment and bypass operation devices, enabling bypass circuit construction without de-energization and delivering a safe, reliable connection solution for live-line bypass operations in medium-voltage distribution systems.
Operating Conditions
Standard Operating Conditions
Altitude: ≤2000m;
Ambient temperature: -40°C to +90°C; equipment operating temperature complies with relevant standards;
Relative humidity: ≤100% (non-condensing);
Environmental conditions: free from corrosive gases, flammable/explosive media, and severe vibration or shock;
Installation method: The T-type rear plug end is inserted directly into the rear-entry receptacle of the distribution equipment; the opposite end connects directly to the bypass cable interface via plug-in connection. Horizontal or vertical installation is permissible; installation space must accommodate plug-in/withdrawal operations.
Special Operating Conditions (Customization Required)
Altitude exceeding 2000m;
Ambient temperature outside the range of -40°C to +90°C;
Severely polluted, salt-spray, or chemically corrosive environments;
High vibration or high-impact operating conditions;
Non-standard interface specifications or special current rating requirements.
Installation and Maintenance
Installation Requirements
Prior to installation, inspect the product for cracks, damage, and voids; verify the insulation surface is undamaged. Inspect the conductive contacts and locking mechanism to confirm they are free from corrosion and deformation and that the locking mechanism operates smoothly and reliably.
Clean the inner surface of the distribution equipment’s rear-entry receptacle and the T-type rear plug exterior to remove grease, dust, and foreign matter, ensuring the interface is dry and clean. Clean the bypass cable interface surface to remove grease, dust, and foreign matter, ensuring the interface is dry and clean.
Apply a uniform coat of approved silicone grease lubricant to the outer surface of the interface to prevent damage to the insulation layer during installation.
Slowly insert the T-type rear plug into the distribution equipment’s rear-entry receptacle until fully seated, then engage the positioning and anti-withdrawal locking mechanism. Connect the opposite end of the product to the bypass cable interface until fully seated and engage the locking mechanism. After installation, verify there is no looseness or misalignment.
Upon completion of installation, perform insulation resistance testing and power-frequency withstand voltage testing before energizing the equipment.
Maintenance Requirements
Periodically inspect the product for cracks, damage, discharge marks, and surface contamination. Verify that connections to the distribution equipment receptacle and bypass cable interface are secure and free from looseness, and that the grounding terminal is reliably connected and free from corrosion.
Periodically test insulation resistance and contact resistance to confirm performance meets requirements and to detect potential faults at an early stage.
Clean the product surface and interfaces to remove accumulated dust and contamination; keep insulation surfaces dry and clean, and protect them from grease and chemical attack.
If abnormalities such as cracks, damage, discharge, overheating, or excessive contact resistance are detected, immediately take the product out of service and replace it. Operation of defective equipment is strictly prohibited.
Plug-in/withdrawal interface operations must be performed using dedicated insulated operating tools. Manual handling of energized interfaces is strictly prohibited; all operations must comply strictly with power distribution safety regulations.
Precautions
Installation, commissioning, and maintenance must be performed exclusively by qualified electrical personnel holding the relevant credentials for live-line operations on medium-voltage distribution systems. Operation by unqualified personnel is strictly prohibited.
The product must be used in conjunction with distribution equipment and bypass operation devices of matching specifications. Use with equipment of differing voltage classes or current ratings is strictly prohibited, as this will result in insulation failure and safety incidents.
The product must not be disassembled or modified without authorization, as this will void the warranty and safety certification. Forced installation or removal of interfaces using non-approved tools is strictly prohibited.
During installation, damage to the insulation surface must be avoided. Silicone grease lubricant must be applied uniformly to preserve insulation performance and sealing effectiveness. Interfaces must be fully locked into position to prevent poor contact leading to overheating or discharge.
During storage, keep the product in a dry, well-ventilated, cool environment away from direct sunlight, high temperatures, moisture, and compressive loads. Contact with sharp objects that could damage the insulation layer is strictly prohibited.
When performing live plug-in/withdrawal operations, strictly observe power distribution safety regulations and implement all required safety protective measures. Non-compliant operations are strictly prohibited.
Model Designation
| Model Designation | Meaning |
| 15kV | Applicable system voltage class; rated voltage 15kV, maximum working voltage 17.5kV |
| Rear Plug Type Quick Plug | Rear-plug type quick connector for rapid mating between distribution equipment rear-entry receptacles and bypass operation devices |
| 250A/630A | Rated current class; compatible with 250A and 630A current loads respectively |
Applicable Standards and Certifications
International standard: IEC 60840, Power cables with extruded insulation and their accessories for rated voltages above 30kV (Um=36kV) up to 150kV (Um=170kV) — Test methods and requirements;
National standards: GB/T 12706, Power cables with extruded insulation and their accessories for rated voltages from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV); GB 3906, AC metal-enclosed switchgear and controlgear for rated voltages from 3.6kV to 40.5kV; DL/T 1476, Preventive Test Regulations for Electrical Safety Tools and Equipment;
The product has passed type testing conducted by the National High-Voltage Electrical Apparatus Quality Supervision and Inspection Center and conforms to national electric power industry standards.
After-Sales Service
Product warranty period: 18 months from the date of shipment, or 12 months from the date of commissioning, whichever comes first;
Products exhibiting quality defects within the warranty period will be repaired or replaced free of charge;
Technical support, installation guidance, and customization services (special specifications, special operating condition adaptations) are available.
Documentation Note
The technical parameters in this manual are based on standard operating conditions. Special operating conditions require customization according to actual requirements. The product technical agreement and type test report shall prevail as the final authority.
Appendix: Product Outline Drawing
