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  MORE than a supplier     HV Power Customer Newsletter February 2014    
           
        Compensated Networks - Earth Fault Help    
 

    In this issue:

Photo - Warwick Beech

 Commentary

Warwick Beech

Kicking off our first 2014 newsletter

Thank you for letting us back into your inbox with our first newsletter for 2014. We hope you will see more than just our electronic presence this year. We are already starting our preparation for EEA in Auckland in June and hopefully will see you there, as well as at your premises, as we release some new and exciting technologies in 2014. In addition, we anticipate seeing some of you at our training courses. The training schedule is on our website.

This month’s newsletter is one of the shorter editions as our suppliers ramp up for 2014. We are, however, pleased to report receiving orders towards the end of 2013 for A.Eberle’s EOR-3D Earth Fault Detection Relays which are suitable for use on compensated power systems. We expect to bring you more news about these as our customers report back their own success stories!

Regards

Warwick

   

Following on from our successful implementation of A.Eberle EOR-D substation level earth fault detection relays, several Swedish Neutral customers have placed orders for EOR-3D Earth Fault Detection Relays for use at feeder level.

The EOR-3D is both an earth-fault and short-circuit passage indicator in an extremely compact housing. In particular, the advantages of different fault detection/location methods can be combined, depending on the fault characteristics. For the first time prioritisation, and thus weighting, of the different fault-locating procedures is possible.

EOR-3D Earth Fault Relay for Compensated Power Systems

Figure 1. A.Eberle EOR-3D Earth Fault Detection Relay for compensated power systems.

The implementation at feeder level requires very accurate voltage and current inputs as the earth fault currents on compensated systems are extremely low. This has been solved by the use of overhead-line-mounted polymer housed combined current and voltage sensors. They are easy to mount and provide “plug and play” connection with the EOR-3D relay.

CT/VT sensors for EOR-3D Earth Fault Relay

Figure 2. Combined CT/VT outdoor sensor for A.Eberle EOR-3D Earth fault Detection Relay.

Often these devices can be located at an established recloser location to use the existing infrastructure of LV supply and communications. However, we also have a solution for standalone applications, with the EOR-3D relay mounted in a stainless-steel weatherproof enclosure complete with battery supply, solar charger and radio comms etc.

If Ethernet communications are available at the device, remote engineering, logbook records and download of Comtrade fault records can also be supported, allowing engineering staff to remotely access the device. Of course, SCADA comms is also supported. With 4GB of internal memory, a substantial quantity of records can be stored for eventual analysis.

The new A.Eberle toolbox software provides a very powerful, yet simple, tool for engineers to understand what is happening at the remote location, and gives a wealth of information (previously unavailable) for analysis of the fault and network conditions.

 

   
      REG-D/DA Voltage Regulator Protocols – PED Card for MODBUS TCP    
     
REG-D/DA Comms module supporting MODBUS TCP

The “PED” SCADA card for REG-D & REG-DA Voltage Regulators is fast becoming a standard for many of our customers. The PED refers to “Protocol Ethernet Dual”, being a dual Ethernet port card. It also has RS-232 and RS-485 ports to support serial protocols. Currently customers are using the PED configured with DNP via RS-485, DNP via TCP, MODBUS RTU (serial) and IEC 61850 (via Ethernet). All these configurations also allow the Ethernet port to be used for remote engineering access.

Recently another protocol support has been added to the PED capability, that of MODBUS TCP, allowing MODBUS customers to swap from serial to Ethernet connection with a simple change of settings.

 

   
      SIPROTEC 5 & DIGSI 5 Update    
     
SIPROTEC & DIGSI 5 Update

The SIPROTEC 5 series is now well-bedded into Siemens production and support, with SIPROTEC 5 becoming a default IED for many international customers.
Now that production is well-established, we are seeing improved pricing for SIPROTEC 5, to the point where SIPROTEC 5 hardware is a strong contender for traditional SIPROTEC 4 distribution utility applications. Some recent product developments include the following.

I/O board with 48 binary inputs
A new I/O module has been added to the SIPROTEC 5 family, so for any application where a large number of status points needs to be monitored, the SIPROTEC 5, series offers expanded capabilities. This new module can be used with any SIPROTEC 5 relay (i.e. transformer, line diff, overcurrent etc), but it is primarily developed for the 7KE85 Fault Recorder.

Two protocols
Prior to V4 firmware, two protocols were supported via two separate communication interfaces. Version 4 firmware now allows one dual Ethernet communication card to support two protocols, i.e. DNP-iP on one port, IEC 61850 on the other.

Circuit breaker wear monitoring
Circuit breaker wear monitoring is now implemented in the V4 firmware.

Transformer differential protection with back-up distance
The 7UT85 series of transformer differential protection relays now features back-up distance protection, enabling the transformer protection relay to also provide back-up distance protection of busbars, lines or other transformers. Over-excitation protection is now also provided.

DIGSI 5 update
Version 4 of DIGSI 5 has now been released, which includes support of the 7SS85 Busbar Protection Relay and the 7SJ82 non-modular overcurrent and feeder protection relay.

Version 4, offers an improved (and more secure) USB connection to the protection relays, and protection relays with the smaller display can now also be programmed with mimic information.

 

   
Services Section SIPROTEC CFC Logic Assistance

Do you want to become more skilled at SIPROTEC CFC logic?

Step one: Make sure you are familiar with these two documents:

Step two: Sign up for our DIGSI 4 Advanced Course (Auckland, 13 August 2014), or invest some time in self-learning using the following Siemens resources:

CFC Basics:

Application sheets & examples:

  • Automatic sequential switching    PDF    DEX
  • Blinking LEDs    PDF    DEX
  • Busbar blocking     PDF    DEX
  • Conditioned CB failure    PDF    DEX
  • Control with function keys    PDF1    PDF2    DEX
  • Counter    PDF
  • Different speeds of voltage drop    PDF    DEX
  • "Down hour" counter    PDF    DEX
  • Easy interlocking    PDF    DEX
  • Echo function    PDF    DEX
  • Graphical current indicator    PDF1    PDF2    DEX
  • Indication of switch key    PDF    DEX
  • Interconnection of two relay comms     PDF
  • Interlocking and SF6 loss    PDF    DEX
  • Long timer    PDF
  • Measurement transducer    PDF
  • Measurement value thresholds    PDF    DEX
  • Parameter group change    PDF    DEX
  • Reset Max/Min    PDF    DEX
  • SF6 loss + interlocking    PDF    DEX
  • 3rd stage overcurrent    PDF    DEX

 

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