ALSTOM P442 PDF

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However, the manuals cannot cover all conceivable circumstances or include detailed information on all topics. Accidental touching of exposed terminals If working alztom an area of restricted space, such as a cubicle, where there is a risk of electric shock due to accidental touching of terminals which do not comply with IP20 rating, then a suitable protective barrier should be provided. IRIG-B must be specified as an option at time of order.

Starts scrolling through the various default displays. The boards and modules use a multi-point earthing strategy to improve the immunity to external noise and minimise the effect of circuit noise. The database of settings and measurements must be accessible from all of the relays user interfaces to allow read and modify operations. To move between the character alstomm of the password, use the and keys. One of two different methods is used to change a setting depending on which category the setting falls into.

The relay series has been designed to cater for the protection of a wide range of overhead lines and underground cables from distribution to transmission voltage levels.

P442 Numerical Distance Protection Relays

The two other functions provided by the power supply board are the RS communications interface and the watchdog contacts for the relay. The Basic scheme is suitable for single or double circuit lines fed from one or both ends. The platform consists of three model variants P, P and P that cover two and three-winding transformers including auto-transformerswith up to five sets of 3-phase CT inputs, and offers high and low impedance restricted earth fault, and has integral asset management capability.

By using the timer hold facility the relay will integrate the fault current pulses, thereby reducing fault clearance time. The majority of faults on overhead lines are transient or semi-permanent in nature, and multi-shot autoreclose cycles are commonly used in conjunction with instantaneous tripping elements to increase system availability. Thus the negative sequence current threshold is: Maximum storage capacity is equivalent to 28 events of 3 s which gives a maximum duration of 84 s.

The RS hardware supports half-duplex communication and provides optical isolation of the serial data being transmitted and received.

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Any equipment containing batteries should have them removed before disposal, taking precautions to avoid short circuits. The current level of access enabled for an interface can be determined by examining the ‘Access level’ cell in the ‘System data’ column, the access level for the front panel Alatom Interface UIcan also be found as one of the default display options.

Sums on one-phase and two-phase loops are performed. See Appendix B for details alztom the connection terminals.

The power supply board also contains the input and output hardware for the rear communication port which provides an RS communication interface. The software can be considered to be made up of four sections: For the P distance protection relay, the protection task is executed twice per cycle, i.

Remote address 1 Since up to 32 relays can be connected to one K-bus spur, as indicated in figure 10, 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. It is possible to apply a negative phase sequence overcurrent relay to detect the above condition. This can be improved by switching off the cycle filter in which case one of the following methods to reduce ac noise should be considered.

An example of the former case would be where a suitable type of VT was unavailable, for example if only a three limb VT were fitted. The equipment should be disposed of in a safe manner. These current thresholds are activated as an exclusive choice with Zero sequence Power Protection since version C2. Such a condition can arise, when an interconnected system splits, and the load left connected to one of the subsystems is in excess of the capacity of the generators in that particular subsystem.

The protection and control software resumes execution when the number of unprocessed samples in the buffer reaches a certain number. They could be used for back up protection during a VT failure. The fixed function LEDs on the left hand side of the front panel are used to indicate the following conditions: Alstom Grid Automation provides utilities and industry with the mission critical software systems and equipment needed to manage the flow of electricity in transmission and distribution grids, ensure grid stability and to protect and control substations.

In this case a permissive overreach or blocking distance scheme must be used. If the R component still has the same sign as at the point of entry, then the power swing is detected and managed in the internal logic as a stable swing.

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.

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Residual power generated by the fault The following chart shows the adjustment menu for the zero-sequence residual overcurrent protection, the adjustment ranges and the default in-factory adjustments.

Alstom relay – P Motor Protection Relay Manufacturer from Navi Mumbai

If the remote relay has also detected a forward fault, qlstom it will operate with no additional delay upon receipt of this signal. Any fault located within the reach of Zone 1 will result in fast tripping of the local circuit breaker.

Distance to fault location assists dispatching of maintenance zlstom Graphical programmable scheme logic eases protection scheme creation, and avoids the need for external logic controllers IEC redundant Ethernet, supporting self healing ring, RSTP, dual homing, PRP or HSR Optional mho and quadrilaterial subcycle alstomm protection Full suite of monitoring, control and recording capabilities plus fault locator, autoreclose and check synchronism Harsh environment coating as standard to all MiCOM relay to protect against corrosive gases such as H2S or SO2.

For protection group settings and disturbance recorder settings, the changes must be confirmed before they are used by the relay.

Overhead lines can be hundreds of kilometres in length. They also provide an additional voltage input for the check sync function. Are familiar with the installation, commissioning, and operation of the equipment and of the system to which it is being connected; Are able to safely perform switching operations in accordance with accepted safety engineering practices and are authorized to energize and de-energize equipment and to isolate, ground, and label it; Are trained in the care and use of safety apparatus in accordance with safety engineering practices; Are trained in emergency procedures first aid.

Micom P442 Numerical Distance Protection Relays

The IDMT characteristic available on the first stage is defined by the following formula: X alphanumeric liquid crystal display LCD.

Zq Block, Bit 4: These are provided to give an indication that the relay is in a healthy state. Alarm Yellow flashes to indicate that the relay has registered an alarm.

This principle is shown in Table 9. Hence the Logical Nodes are allocated to one of the five Logical Devices, as appropriate, and the wrapper names used to instantiate Logical Nodes are consistent between Px40 relays.

Four settings apply to the rear port using IEC which are described below.