Earth Fault Compensation & Current Injection

Solutions for Varying Network Topologies

erdschluss
A diverse range of functions for the reliable control of arc suppression coils
steuerung
Freely programmable for customer-specific adaptation
erdschlussfall
Reliable control in case of earth faults
erdschluss-kompensieren
The current injection helps to adjust the arc suppression coil successfully
erdschluss
A diverse range of functions for the reliable control of arc suppression coils
steuerung
Freely programmable for customer-specific adaptation
erdschlussfall
Reliable control in case of earth faults
erdschluss-kompensieren
The current injection helps to adjust the arc suppression coil successfully

Earth Fault Compensation

Products

Current Injection and Pulsing

Products

What Is Earth Fault Compensation?

Earth fault compensation is a method of limiting the residual current in the event of an earth fault in an electrical power supply network. An earth fault is a fault in which one phase of the network is in direct contact with earth, which can lead to a significant residual current. The aim of earth fault compensation is to reduce this fault current to a minimum by using special chokes, so-called earth fault chokes or Petersen coils. A synonym for earth fault compensation is resonant star earthing, often referred to as an extinguished network.

Resonant star earthing is based on the principle that the inductance of the choke coil resonates with the capacitance of the mains. As a result, the capacitive current flowing in the event of an earth fault can be compensated, which greatly reduces the fault current or even brings it to almost zero. This form of earthing is particularly common in extinguished networks, where earth faults should only cause very low currents in order to ensure the safety and stability of the network.

An example: An earth fault occurs in a 20 kV medium-voltage network. By using a Petersen coil that is matched to the grid capacity, the fault current is reduced to such an extent that the grid does not need to be shut down immediately. The grid can continue to be operated and the fault can be rectified during planned maintenance without causing a grid failure.

Virtual Instruction Manual

Description of the Basic Approach for the Commissioning of the REG-DP(A)


MORE Information

AE Toolbox
The perfect supplement to arc suppression devices: freely adjustable project planning and parameterisation software

The AEToolbox works on a project basis and impresses with its range of functions and the versatility that the program offers.

All Control, Measurement and Recording Tasks

„Around the Arc Suppression Coil“

Our freely programmable petersen coil regulators REG-DP & REG-DPA are used in medium and high-voltage networks to regulate continuous, variable-under-load arc suppression coils (Petersen coils, also known as P-coils or E-coils). In addition, they can handle all other control, measurement and regulation tasks having to do with arc suppression coils.

The classic regulation process, i.e. searching for the resonance curve across the range of travel of the coil, can no longer successfully adjust the arc suppression coil in certain network situations.
We have developed this current injection for the increasingly frequent cases where the zero-sequence voltage is highly disturbed or subject to extreme influences or where networks are highly symmetrical. The current injection creates a signal that is fed into the network via the auxiliary power winding of the arc suppression coil. From the network reaction, the combined REG-DP(A) and current injection are able to calculate a resonance curve despite the low or highly variable zero-sequence voltage.

Our Freely Programmable Petersen Coil Controllers

Reliable control in the event of an earth fault – proven a thousand times over and in use worldwide

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What Is (Short-Term) Low-Resistance Neutral Earthing?

Low-resistance star point earthing is a method of earthing the star point of an electrical network in which the star point is connected to earth via a resistor. This resistor has a relatively low value so that a high earth fault current flows in the event of a fault. This earthing method is used to ensure the protection of persons and systems in electrical distribution networks.

Short-term low-resistance neutral earthing refers to a specific operating mode in which the low-resistance earthing is only active for a short time after an earth fault occurs. This enables the fault to be detected and localized quickly, while the network maintains a high safety standard.

An example: An earth fault occurs in a medium-voltage network. The momentary low-resistance star point earthing is activated, generating a defined earth fault current that can be easily detected by the protective devices. After a short time, the low-resistance connection is disconnected to minimize the fault current and protect the system from further damage. The network can then continue to be operated in a higher resistance mode or with a different form of earthing.

The Low-resistance star point earthing method is typically used in networks where fast fault detection and rectification is required. The earth fault current is set high enough by the low-impedance resistor to reliably trigger overcurrent-dependent protective relays. The exact dimensioning of the resistor depends on the grid parameters, including the grid voltage and the earth fault current requirements.

A typical value for the resistance in a low-resistance star point earthing could, for example, be selected so that a current of several hundred amperes flows in the event of an earth fault. This high current ensures that the fault is detected quickly and the affected line is switched off.

Low-resistance star point earthing is often used in networks that are otherwise unsaturated star-point earthed to enable rapid fault detection. In these systems, short-term low-resistance star-point earthing offers the advantage that it only carries out earthing temporarily, which means that the advantages of other earthing methods, such as resonant star-point earthing, are not impaired.

In summary, low-resistance neutral earthing, and in particular short-term low-resistance neutral earthing, offers an effective method of earthing in electrical distribution networks that enables both rapid fault detection and a high standard of protection.

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News From the Product Group

EORSys – News

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The Current Injection CI is currently scheduled for product discontinuation.[…]

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Info letter

Info Letter No. 21: The influence of the contact resistance at the earth-fault location on the zero sequence voltage UEN in compensated networks

7. September 2021

The earth fault in compensated networks is usually presented without a contact resistance at the fault…[…]

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Info letter

Info Letter No. 20: Capacitance of conductors

7. September 2021

In the conductors of electrical power supplies, a distinction is made between the operating capacitance… […]

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Info letter

Info Letter No. 12: E-coil control: Resonance curve procedure – Location curve procedure

7. September 2021

In “compensated networks” the current through the point of failure is minimised with the help of an…[…]

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Info letter

Info Letter No. 4: Summation of Alternating Currents

7. September 2021

For the parallel connection of power sources, the principle of superposition applies, when all resources…[…]

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Info letter

Info Letter No. 3: The E-coil in general

7. September 2021

The earth fault compensation coil, e-coil or also called the Petersen coil after its inventor, is connected…[…]

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