High-voltage Permanent Magnet Mechanism Vacuum Switch for Mining Flameproof Mobile Substations
Key attributes
| Brand | ROCKWILL |
| Model NO. | High-voltage Permanent Magnet Mechanism Vacuum Switch for Mining Flameproof Mobile Substations |
| Rated frequency | 50/60Hz |
| Series | KJGZY |
Product descriptions from the supplier
Product Introduction
The KJGZY series flameproof and intrinsically safe high-voltage permanent magnet mechanism vacuum switches for mining mobile substations are equipped with multiple protection functions, including overload, short circuit, overvoltage, undervoltage, leakage, leakage locking, phase loss, over-temperature, wind power and gas locking, as well as emergency shutdown of the upper-level power supply. They are particularly suitable for power supply of underground equipment in large mines with high requirements for safety and automation.
Feature
Independent Chambers：Equipped with independent circuit breaker chamber, isolating switch chamber, and wiring chamber, enabling live maintenance, safe and reliable operation and upkeep.
High Precision：1A step setting for higher precision.
Effective Explosion Protection：Integrated three-chamber design ensures reliable explosion protection.
Digital Control：Adopts an industrial programmable logic controller (PLC) and human-machine interface (GOT) to form the core control system, featuring stable performance, precise protection, and simple maintenance. It also has fault memory and password locking functions.
Advantage
Stable Operation：Adopts an industrial programmable logic controller (PLC) and human-machine interface (GOT) to form the core control system, featuring stable performance, precise protection, and simple maintenance.
Safety and Reliability：Current can be continuously set with a step value of 1A, enabling safe and reliable live maintenance, operation and upkeep. All faults trigger the high-voltage side vacuum circuit breaker to trip via signal lines, reducing breaking current.
Multiple Protections：Equipped with protection functions including overload, short circuit, overvoltage, undervoltage, leakage, leakage locking, phase loss, over-temperature, wind power and gas locking, emergency shutdown of upper-level power supply, etc. It can also protect against faults fed back from the low-voltage side of the mobile substation.
Modular Design：Comes with standard RS232/485 communication interfaces, featuring powerful remote communication and control functions. It has a small size, reasonable structure and intuitive operation.
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Related Knowledges
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Main Transformer Accidents and Light Gas Operation Issues1. Accident Record (March 19, 2019)At 16:13 on March 19, 2019, the monitoring background reported a light gas action of No. 3 main transformer. In accordance with the Code for Operation of Power Transformers (DL/T572-2010), operation and maintenance (O&M) personnel inspected the on-site condition of No. 3 main transformer.On-site confirmation: The WBH non-electrical protection panel of No. 3 main transformer reported a Phase B light gas action of the transformer body, and the reset was ineff02/05/2026 -
Faults and Handling of Single-phase Grounding in 10kV Distribution LinesCharacteristics and Detection Devices for Single-Phase Ground Faults1. Characteristics of Single-Phase Ground FaultsCentral Alarm Signals:The warning bell rings, and the indicator lamp labeled “Ground Fault on [X] kV Bus Section [Y]” illuminates. In systems with a Petersen coil (arc suppression coil) grounding the neutral point, the “Petersen Coil Operated” indicator also lights up.Insulation Monitoring Voltmeter Indications:The voltage of the faulted phase decreases (in01/30/2026 -
Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026
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