ZJB Series Transformer Neutral Gap Earthing Device
Product Description
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1 - Wide Application Range: Suitable for 110kV & 220kV conventional substations, unattended stations, power plant step-up transformers and other scenarios.
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2 - Durable & Stable Electrodes: Rod gaps or spherical gaps are optional, featuring low dispersion of discharge voltage without deviation during long-term operation.
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3 - Low Maintenance Demand: No wearing or consumable parts. Only simple cleaning is required in thunderstorm seasons, ideal for remote stations with limited operation staff.
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4 - Standardized Integrated Supply: Brackets, arresters and CTs are delivered as a complete set for one-time hoisting and installation.
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Equipment Parameters
| Equipment rated voltage | Transformer neutral point withstand voltage | Disconnector | Zinc oxide surge arrester | Spark gap | Current transformer | ||||||
| Lightning full wave and harmonic withstand voltage (peak value), kV | Power frequency withstand voltage(1 min), (RMS value) kV | Rated current, A | Operating mechanism | Rated current | Continuous operating voltage (RMS value) | DC 1 mA reference voltage (minimum value) | Lightning impulse residual voltage at 8/20 μs | Power frequency discharge voltage ±10% (RMS value) | Type | Ratio | |
| 66~363kV | According to relevant standards | Manual or electric (optional) | According to standards or user requirements | According to standards or user requirements | Epoxy resin cast fully enclosed post type | According to standards or user requirements | |||||
Execution standards
Technical advantages
The equipment adopts an integrated complete-set design, integrating high-voltage disconnectors, discharge gaps, zinc oxide arresters, current transformers and steel mounting brackets into a standardized unit. Complete calibration is carried out before delivery, and only foundation fixing and wiring connections are required on site, enabling ultra-fast installation and commissioning. The arrester instantly releases lightning energy, while the discharge gap reliably isolates power-frequency fault current. The dual barriers provide comprehensive protection for the insulation safety of the transformer neutral point and prevent winding insulation damage failures. The operable disconnector supports flexible switching of operation modes, allowing free conversion between two working conditions as required: "direct neutral earthing" and "unearthed operation via gap connection." All metal components are hot-dip galvanized for anti-corrosion treatment, and high-voltage insulating parts feature contamination and weather resistance. The equipment can operate stably for a long time both indoors and outdoors, greatly reducing maintenance frequency.