Neutral Grounding Reactors
Effectively limits fault currents and protects your transformer, preventing damage to your neutral point.
Precision-Engineered Grounding Solutions for High-Stability Grids
In modern power distribution systems, a single-phase ground fault doesn’t just trip breakers, and it also sends a surge of current that can damage your transformers, thereby stressing your rotating machinery and threatening your entire system.
LTECPower Neutral Grounding Reactors (NGRs) are built to stop that. Withstanding the extreme thermal stresses generated during a fault event, they limit fault current to a safe, manageable level for the critical seconds that matter (10 to 60 seconds, precisely where you need it). So your transformers and generators stay protected, and your grid keeps running.
As a premier Sino-German joint venture, we make our NGRs in a 20,000m² state‑of‑the‑art facility. Every unit we made is type‑tested and fully compliant with IEEE C57.16 and IEC standards, so you can get proven protection, not just a promise.
Technical Data
| Standard & Certifications | |
|---|---|
| Compliance Standards | IEC/EN 60076-6, IEEE C57.16, EN 61558-2-20 |
| Insulation System | UL 1446 Recognized |
| Electrical Performance | |
|---|---|
| Rated Voltage (Un) | 3.3kV / 6.6kV / 11kV / 33kV (Up to 35kV Customizable) |
| Rated Frequency | 50Hz / 60Hz |
| Rated Fault Current | 10A – 2000A |
| Duty Cycle (Short-time Rating) | 10s / 30s / 60s / Continuous Operation |
| Reactance Type | Air-core / Gapped Iron-core |
| Inductance Tolerance | 0/+5% (Optional: ±3% high-precision request) |
| Linearity | 1.55 – 2.2 In (Maintains constant inductance under fault surge) |
| Blocking Factor | 5% – 14% |
| Permitted Harmonic Content | U3=0.5%, U5=5%, U7=5% |
| Dielectric & Thermal Specs | |
|---|---|
| Insulation Class | Class H (180°C) with UL-approved VPI resin |
| Dielectric Test (Hi-Pot) | 3kV 50Hz / 60Hz for 60s |
| Thermal Protection | 135°C NC (Normally Closed) thermal switch (Optional) |
| Mechanical & Environmental | |
|---|---|
| Design Construction | Single-phase / Three-phase; Dry-type iron core with multiple air gaps for low noise/loss |
| Winding Material | High-conductivity Copper or Grade-A Aluminum |
| Terminals | Copper busbars or flexible cables (Customizable upon request) |
| Cooling Method | AN (Natural Air Cooling) |
| Protection Class | IP00 (Open Type) to IP55 (Outdoor Enclosure) |
| Operating Ambient | -25°C to +50°C |
| Installation Altitude | ≤ 1000m a.s.l. (Up to 5000m optional for high-altitude projects) |
| Maximum Humidity | 95% Non-condensing |
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The high‑capacitance systems, including long underground cables, offshore wind farms, and data centers, are susceptible to ground faults, which may cause transient overvoltages. If left unchecked, that may stress insulation, threaten equipment, and compromise your system stability.
Unlike resistors, LTECPower neutral grounding reactors do not just limit current; they provide you with the inductive reactance that compensates for the system’s capacitive charging currents. Even within the most complex high-voltage architectures, our neutral grounding reactor actively suppresses overvoltages while keeping your neutral point stable.
Uncontrolled ground fault currents not only flow; they also slam into transformer windings with immense mechanical force, creating “electrodynamic” stress that can cause damage. Engineered with high mechanical strength, our neutral grounding reactors are designed to withstand that stress. Whether you’re running 11kV industrial motors or managing a 33kV substation, our reactors will keep your equipment protected and online at all times.
When a fault happens, heat builds fast. Built with Class H (180°C) Nomex insulation, our neutral grounding reactors can withstand severe thermal shock, from -20°C to 180°C, cycle after cycle. Even after repeated thermal stress, the reactors maintain 99.9% dielectric integrity, and the inductance stays constant up to 1.5x rated current.
Neutral Grounding Machine: Specifications & Gallery
| Parameter | Details | What It Means for You |
|---|---|---|
| Rated Voltage | 230V to 1000V | Covers the full low-voltage distribution range One solution for factories, buildings, and data centers |
| Inductance Tolerance | 0/+5% | Tighter than the industry standard of ± 10% More precise tuning, lower risk of resonance |
| Insulation Class | H (180° C) | High-temperature insulation system Handles overloads better, lasts longer |
| Cooling Method | Natural Air | No fans, no oil Maintenance-free operation, zero noise |
| Protection Class | IP00 | Open-type design Easily integrates into your existing |
| Winding Material | Copper / Aluminum | Two material options available Choose what fits your budget and performance needs |
Offshore wind platforms face a harsh reality: salt spray, moisture, and ultra‑long submarine cables. LTECPower neutral grounding reactors are built to withstand such environments. Built with stainless steel enclosures and C5-M grade high-durability coatings, our grounding reactors provide you with the inductive compensation needed to stabilize the neutral point of your offshore substation. So a single fault doesn’t jeopardize the energy output of your entire wind farm.
It depends on your system. If you have long cable runs or high charging current, LTECPower’s neutral grounding reactor is the better choice. Over resistors, the reactors suppress resonance and limit overvoltage more effectively, and they handle heat better during a fault.
LTECPower’s neutral grounding reactors are rated for 10 to 60 seconds, enough for your protective relays to detect the fault and clear it. The window gives you the time to react without risk of overheating.
Yes. Our neutral grounding reactors are built to meet or exceed the original OEM specifications. If you give us your technical specs, we can provide you with a direct “plug‑and‑play” electrical replacement with the same performance, even shorter lead times.
If your reactor will be installed outdoors, such as a substation, then you need a strong enclosure that meets NEMA 3R or IP55 protection standards to protect it from UV, rain, and wildlife. It is a small investment that keeps your equipment safe for years.
You can leave it to us. Send us your system’s phase‑to‑ground capacitance and the fault current limits you’re targeting, then our engineering team will run the simulations and recommend the right impedance without cost and obligation.
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