ERL Marketing International

Sharjah, United Arab Emirates

The IEC 61850 station bus embedded T-PRO 4000 relay provides complete 3-phase multi-winding transformer fault and overload protection, DFR-quality fault oscillography, sequence of event logging, trend recording, transformer monitoring, and overload early warning (TOEWS) in a fully integrated protective relay solution, with advanced communications in a flexible cost-effective package.

Applications

• Primary and backup protection, as well as management of small, medium and large power transformers and reactors (including differential, ground differential, phase, neutral and ground overcurrent, phase undervoltage, neutral overvoltage, under- and over-frequency, and overexcitation)

• Transformer asset monitoring using thermal overload based on hottest spot or top oil temperature, Transformer Overload Early Warning System (TOEWS) and Through Fault Monitoring

Features and Benefits

• Ideal for high-speed protection and complete control of multi-winding transformers with the HV and LV windings connected to ring or breaker-and-a-half arrangements
• Internal magnitude and phase shift compensation, eliminating requirements for external CT connections and auxiliary CTs
• 2nd harmonic restraint algorithm improves security for energization and inrush
• THD alarm function alerts to the degree of current waveform distortion and therefore harmonic content
• Asset management to maximize use of transformer capacity (ANSI/IEEE C57.91-1995)
• Through fault monitoring function allows measuring the duration, current peak RMS and accumulated I²t values for each phase during through fault. Use this information for analysis and preventing maintenance planning
• Ambient Temperature Adaption (ADP) adjusts the pickup level of the time overcurrent protection (51 HV) based on the ambient temperature
• Flexible Communications
  • State-of-the-art communications (2 rear ports, 100BASE-TX RJ-45 or 100BASE-FX 1300 nm multimode optical with ST style connector to accommodate the industrys latest network-based communications)
  • Ethernet ports with 2 unique MAC addresses that easily accommodate network access security needs
  • Front panel USB and 100BASE-TX RJ-45 Ethernet port interfaces (readily accommodate modern standard laptops)
• Reduced Cost
  • Substation automation cost includes IEC61850 protocol to display and transfer operational data via local-area network (LAN) for local HMI and wide-area network (WAN) for remote monitoring SCADA
  • Substation engineering, installation and commissioning cost and times IEC 61850 GOOSE messages communicate high-speed information between IEDs on the substation LAN (including transfer trips, interlocking, load-shedding, and commands)
  • Product setting time 240 x 128 LCD graphical user interface provides convenient means to check/change specific settings and parameters
• Improved Overall Response Time
  • Expedited response to systems events (11 generic front panel LEDs can be mapped to internal elements) allowing operators to quickly identify the cause of system events

Easy to Use

• Flexible programmable logic for building customized schemes with ProLogic statements 24 control logic statements (total of 192 statements)
• User-friendly, Windows-based relay setting and record analysis software
• Enhanced DNP3.0 Level 2 SCADA communication protocol including user-selectable point lists, class support and multiple master station support
• Exceptional fault recording capabilities with 96 s/cycle, all channels with events (best combination of waveform accuracy and file size)
• High quality recording - fault recording (96 samples/cycle), up to 600 days of trending information of MW, MVAR, I, ambient temperature and loss of life, and event logging (1 ms resolution)
• Highest storage capacity of sequence of event records with a maximum capacity of 150 files each containing up 230 events

TRrelays are a range of voltage operated, multi-contact, attracted-armature relays, complying with the appropriate requirements of IEC 60255. A wide range of models is available to meet the requirements of the electrical power sector.

Application

• Tripping and auxiliary duties where immunity to capacitance discharge is not required
• Can be used for application when they are remote from the initiation signal

XRrelay has been developed for specific applications, and suitable for use with type AR relay range. It is an electro-mechanical relay with a consistent positive action, a long service life and complying with the appropriate requirements of IEC 60255. The XR351 has three attracted armature elements. It incorporates a time delay on de-energisation, to keep the relay in an operated condition, during temporary reduction in the battery voltage.

Application

• Supervision and ensuring the integrity of the trip circuit of a breaker
• Continuous supervision during both, open and closed position of circuit breaker
• Pre-closing supervision to prevent circuit breaker from being closed where the trip relay has not been reset

ARrelays are a range of electro-mechanical relays with up to 8 contacts and complying with appropriate requirements of IEC 60255. They can be supplied in most combinations of contacts, flag and reset arrangements and with a fixed time delay.

Application

• Protection circuits where high degree of reliability and high contact rating are stipulated

2DABrelay is a circuit breaker fail and current check relay. It can be used to monitor current flow prior to sequence switching.
Each pole of the relay is phase segregated and operates independently via its level detector and interface area. The provision of the interface area allows for the factory fitting of output relays to the customer's requirements. With this flexibility the interface area relays can be manufactured with up to 9 change-over contacts, connected as phase segregated groups of three, or as three phase outputs. The standard arrangement is with 4 normally open output contacts.
Each level detector initiates a time delay, set by the user, which delays operation of the output relay. This can be set to zero for instantaneous operation.

Application

• Current check relaying in circuit breaker fail scheme
• Monitor current flow prior to sequence switching e.g. Mesh corner schemes
• Detects CB fail to trip and ensure discrimination has a fast reset time and a minimum overshoot time

MDDArelay consists of a power supply unit, a timer unit and an attracted armature auxiliary relay. Resistor and Zener diode combination of the power supply unit provides low voltage stabilised DC supply to the static timer circuit. Non-linear resistors are used in the power supply unit for surge suppression.
The timer unit consists of a timer circuit and a thumb wheel switch. The thumb wheel switch mounted on the name plate of the relay provides precise and high resolution time setting. The timer unit operates a reed relay which in turn energises an attracted armature auxiliary relay. This auxiliary relay is provided to achieve higher contact rating and flag indication, if required. MDDA can be provided either as a delay on pick up relay or as a delay on drop-off relay.A normally open contact is used for initiating time delay on pick up relay and output element gets energised after the set time delay. In the case of delay on drop off relay, the output element is normally energised and with the normally closed initiating contact opening out, the output elements gets de-energised after the set time delay.

Application
Type MDDA is a definite time lag relay that can be used for applications where an accurate and consistent time-delay operation is required

The single-phase overvoltage relay basically comprises a tapped input transformer fitted with a plug-bridge, a potentiometer, a level-detector and a dry-reed repeat element. When the relay setting is exceeded, the level detector triggers and so energizes the repeat element.
The single-phase undervoltage relay is similar to the above but is maintained operated and ?drops off? when the monitored voltage falls below the relay setting. The three-phase relays comprise of three of the above elements.

Application

• Type TEB1 provides either over-voltage or under-voltage protection for 3-phase systems
• Type TEB 2 provides either over-voltage or under-voltage protection for single phase systems

It consists of a low impedance coil, metal rectifier and load resistance in each phase. During normal condition the relay coil is shorted with the fuse. Once the fuse blows, current flows through the relay and it operates. The load resistance 1K will come into picture when the system is lightly loaded.

Application

• Alarm relay used for supervision of fuses in the protection circuits
• Can be used for protection blocking where the protection relays operating time is more than 30 ms

The relay comprises an attracted armature element fed via a rectifier and series resistor. It can be provided with either a fixed setting, or variable settings using a plug bridge. It has a minimum withstand of rated voltage continuously.

Application

• Capacitor bank
• Ungrounded/High impedance earthed systems
• AC Generators