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We Also Deal In. The loss of load logic provides fast fault clearance for faults over the whole of a double end fed protected circuit for all types of fault, except three phase. Real time monitoring and control of the power system Improved accuracy, latency and reporting rates versus SCADA data Flexible communications Graphical programmable scheme logic PSL eases protection scheme creation, and avoids the need for external logic controllers.
This technique is employed to provide extra security, and so that several setting changes that are made within a group of protection settings will all take effect at the same time.
Micom P442 Numerical Distance Protection Relays
Current transformer supervision – To raise an alarm should one or more of the connections from the phase CTs become faulty. The cover can then be moved vertically down to release the two fixing lugs from their recesses in the front panel.
Overhead lines can be hundreds of kilometres in length. Over temperature conditions therefore occur when currents in excess of rating are allowed to flow for a period of time.
P442 Numerical Distance Protection Relays
The User Programmable Curve Tool provides the following features: When full access to the relay keypad is required, for editing the alsstom, the transparent cover can be unclipped and removed when the top and bottom covers are open. However, in the rare case when a large number of records to p42 logged are created in a short period of time, it is possible that some will be lost if the supervisors buffer is full before the platform software is able to create a new log in battery backed-up SRAM.
See Appendix B for details of the connection terminals. Mobile Number Please enter Mobile Number.
Remote address Up to 32 relays can be connected to one IEC spur, and therefore it is necessary for each relay to have a unique address so that messages from the master control station are accepted by one relay only. That flat delta criterion enabled by S1 will improve the detection of a 3 Phase fault during a power swing in case of faulty current lower than the Imax line threshold settable in S1 ms are required for unblocking the logic.
The setting value can then be changed by pressing the or keys. Menu database This database defines the structure of the relay menu for the Courier interface and the front panel user interface. Access level Operations enabled Level 0 No password required Read access to all settings, alarms, event records and fault records Level 1 Password 1 or 2 As level 0 plus: This is to avoid possible shock or damage hazards.
Password 2 required All other settings. Out of service Yellow indicates that the relays protection is unavailable. The boards and modules use a multi-point earthing strategy to improve the immunity to external noise and minimise the effect of circuit noise. Directional earth fault protection DEF – This can be configured for channel aided protection, plus two elements are available for backup DEF. The input to the PSL is alstkm combination of the alsttom of the digital input signals from the opto-isolators on the input board, the outputs of the protection elements, e.
Using programmable scheme logic, the user can readily change the default direct-action pushbutton aostom and LED indications to fit specific control and operational needs. Full feeder management with efficient monitoring, control, recording and digital communications Supports all major digital control system protocols, easing integration into DCS, SCADA and engineering workstations Harsh environment protection alstkm the life of the product New advanced opto inputs comply with the harshest norms for surge withstand, plus the ESI EB2 standard.
Contact fingers of test plugs are normally protected by petroleum jelly, which should not be removed. L442 RS hardware supports half-duplex communication and provides optical isolation of the serial data being transmitted and received. This feature is employed to avoid conflict between different parts of the software during a setting change. Maximum of Residual Power Protection – Zero sequence Power Protection This element provides protection for high resistance faults, eliminated without communication channel.
Typical characteristic angle settings are as follows: Starts scrolling through alztom various default displays. Each input also has selectable filtering which can be utilised. Undo the last action. These comprise the 9-pin D-connector for RS serial communications e.
The relays are driven from the 22V power supply line. Each relay aletom designed around a common hardware and software platform in order to achieve a high degree of commonality between products. Get a Best Deal.
These can arise from broken conductors, maloperation of single phase switchgear, or the operation of fuses. Agile-Feeder-P Add to cart.
RP2 Baud Rate Courier communications is asynchronous. Thus the pin connections of the relays 9-pin front port are as follows: The Courier address is then used by the master station to communicate with the relay. Phase and earth fault distance protection, each with up lastom 5 independent zones of protection 6 zones from version C5.
P Areva Distance Relay
Time delayed backup protection. This means p4442 for a forward earth fault, the residual current is expected to be approximately in alstpm with the inverted residual voltage -Vres.
IDMT characteristics are selectable on the first stage of NVD and a time delay setting is available on the second stage of NVD in order that elements located at various points on the system may be time graded with one another. Under the bottom hinged cover: This is a dangerous condition for the machine due to the heating effects of negative phase sequence current and hence an upstream negative phase sequence overcurrent element may be applied to provide back-up protection for dedicated motor protection relays.
Comprehensive communication options including IEC and redundant Ethernet ports IEC interface option allows integration within digital substation process bus architectures Variety of built-in aided schemes over 2 channels Unparallelled speed, security and selectivity. Operators may then investigate the cause of the unbalance. This Safety Section also includes reference to typical equipment label markings.
Depending upon the type of convertor and fibre used, direct communication over a few kilometres can easily be achieved. This in turn is dependent upon the method of system earthing employed and may be calculated by using the formulaes previously given in the above figures. The physical layout of the second rear comms board is shown in Figure 3. Trip on reclose TOR protection – These settings enhance the protection applied on autoreclosure of the circuit breaker.