DN-G Zero-Sequence Voltage Processor, Zero-Sequence Voltage Processor, Suitable for Precision Instruments

1、What is zero ground potential?

The Concept of Zero-Sequence Voltage Elimination: Zero-sequence voltage elimination is suitable for loads with high zero-sequence voltage requirements, such as instruments and meters (e.g., medical radiation equipment, communication precision instruments, laser instruments, precision machine tools, etc.). Due to the centralized and distributed power supply system in our country, many loads ignore the existence of zero-sequence voltage when connected to the power grid. In severe power supply environments, the zero-sequence voltage can reach5~20V range. Such a power supply environment is根本不可能 allow precision instruments to operate normally. Generally, a standard power supply system requires the zero-ground voltage not to exceed 2V.

2、The generation of zero ground potential mainly involves:

1） Power system load existsNeutral current and neutral impedance-induced neutral voltage drop value.

2） Power SupplySystem harmonic is too high (especially with excessive zero-line and ground-line harmonic current content)

3） Cable runs for power supply system and load are too long.

4） Unbalanced three-phase power supply load operation generates zero-sequence induced voltage.

3、In compliance with national standards regarding excessive zero-ground voltage, the zero-ground voltage on the supply load side must not exceed2V。

4、Hazards of zero ground voltage

Zero ground voltage impact on loadPrimarily manifested in three aspects: causing hardware failures and destroying circuit equipment; triggering incorrect actions of control signals; and affecting communication quality.

High ground voltage can cause hardware damage. Generally speaking,The neutral to ground voltage must not exceed 2V. Excessive neutral to ground voltage can not only cause direct hardware damage to electronic devices but may also affect control signals, leading to incorrect startup and shutdown of equipment; it may also increase error rates and packet loss, slowing down communication and reducing transmission speeds; it can also impact communication quality, delaying or preventing normal communication. For computer equipment, high neutral to ground voltage can lead to reduced server speed, decreased network switching speed, unexpected server shutdowns, and even hardware damage.

With the rapid advancement of computer technologyThe working voltage of internal computer chips is becoming lower and the energy consumption smaller. To ensure the normal operation of servers, manufacturers like IBM and HP are increasingly demanding higher zero-ground voltages in server rooms.

UPS's guaranteed zero-sequence voltage less than [specific value] refers to the additional zero-sequence voltage not added. That is, when the zero-sequence voltage at the input distribution board in the data center is 0V, inUPSOutput end zero-to-ground voltage. If the user's distribution system does not meet the requirements, there may be zero-line current or inter-line higher-order harmonic coupling, resulting in a certain voltage difference between the neutral line and ground. As such, inIn the UPS input, zero ground voltage will rise and fail to meet the equipment requirements, which is not a problem that can be completely solved by the UPS itself.

5. ReduceWhat are the benefits of a power supply system with zero-to-ground voltage treatment?

l Reduce zero-to-ground voltage.Avoid neutral and ground lines, prevent live equipment casing to ensure personal safety.

l Avoid zero ground voltageCaused power system protection to trip, preventing electrical fire accidents caused by short circuits.

l AvoidNeutral line zero drift prevents potential zero drift in the power supply system from causing high voltage and large currents.

l Avoid harmonic interference with precision equipment (such as computer crashes), which may cause unnecessary losses.

l Avoid false operation of zero-sequence protection and eliminate economic losses caused by such false operations.

6、Solution:How to resolve this issue? Many engineers have thought of enhancing the grounding of the earth wire to address the problem, but this is not a good solution. This is because modern power supply systems generally use a starY connection, the ground wire and the load side ground wire are in a direct looped state, issues with zero-ground voltage will always be present. In response to these issues, our company has designed a magnetic zero-ground treatment system based on magnetic technology (now known as:Literate Intelligent Zero Ground Voltage ProcessingAppliance）It utilizes power to generate a magnetic flux of equal magnitude but opposite direction as the one it cancels out, thereby achieving compensation.

7、LiteSmart Zero Ground Voltage ProcessingApparatusSimple installation, suitable for precision instruments; installation on the input side of meters can reduce zero ground current.Below 0.5-1V, eliminate the hidden danger of high voltage in the neutral and ground wires.

8、Zero-Sequence to Ground Voltage Treatment System Product Features

l Fully automatic, stable operation, maintenance-free.

l Service life spans up to 20 years.

l Only filter harmonics, do not alter the original three-phase voltage, and control the zero-to-ground voltage1V and below (national standard requires not to exceed 2V)）；

9. Technical Data

The technical data listed in this table is the standard specification. If there are any special requirements, please contact us.

10Installation MethodZero-to-ground voltage eliminator wiring diagram (for single-phase and three-phase loads)

Single-phase Load Neutral to Ground Voltage Eliminator Wiring Diagram

Three-phase four-wire load neutral to ground voltage eliminator wiring diagram

11、Littell Intelligent Standard ModelZero-ground voltage processorSelection Chart