Page Ground Directional Range: 0. CDR 4. Page High-Set Phase Overcurrent , below 2. The pickup level for the ground current elements is programmable as a multiple of the CT. The Page S6 Voltage Elements Range: 0. Page Overvoltage Range: 0. Page Overfrequency Range: Page Neutral Overvoltage 3Rd Harmonic 4. In cases of paralleled generator grounds through the same point, with individual ground switches, per sketch below, it is recommended to use a ground switch status function to prevent maloperation of the element.
Page 94 VTFF element. In order to prevent nuisance tripping the elements require a mini- mum phase current of 0. Page S7 Power Elements Generation of power will be displayed on the as positive watts. By convention, an induction generator normally requires reactive power from the system for excitation.
This is displayed on the as negative vars. A synchronous generator on the other hand has its own source of excitation and can be operated with either lagging or leading power factor. This is dis- played on the as positive vars and negative vars, respectively. Page Reverse Power Range: 0.
Page S8 Rtd Temperature This alarm will look at all RTDs that have either an alarm or trip programmed and determine if an RTD connection has been broken. Any RTDs that do not have a trip or alarm associated with them will be ignored for this feature. Page S9 Thermal Model 4. However, some of the thermal model features may be used to model the heating that occurs in synchronous generators during overload conditions.
Page Model Setup Range: 0. Regardless of which curve style is selected, the will retain thermal memory in the form of a register called Thermal Capacity Used.
Page 4. Page Page The distinct parts of the thermal limit curves now become more critical. For these conditions, it is recommended that the custom curve thermal model be used. The custom overload curve allows users to program their own curves by entering trip times for 30 pre-determined current levels. Page The protection relay must be able to distinguish between a locked rotor condition, an accelerating condition, and a running condition.
The voltage dependent overload curve feature is tai- lored to protect these types of machines. Voltage is monitored constantly during starting and the acceleration thermal limit curve adjusted accordingly. For voltages inbe- tween these levels, the shifts the acceleration curve linearly and constantly based upon the measured voltage during generator start.
Page The measures the ratio of negative to positive sequence current. The thermal model may be biased to reflect the addi- tional heating that is caused by negative sequence current when the machine is running. This biasing is done by creating an equivalent heating current rather than simply using average current I the equation shown below. This reduction simulates machine cooling. The cooling time constants should be entered for both stopped and run- ning cases the generator is assumed to be running if current is measured or the generator is offline.
The value entered for this setpoint dictates the level of thermal capacity The demand values of generators may be of interest for energy management programs where processes may be altered or scheduled to reduce overall demand on a feeder. Each output parameter can be assigned to any one of the alarm or auxiliary relays. Pulsed output is disabled for a parameter if the relay setpoint is selected as OFF for that pulsed output. Each channel may be individually config- ured to represent a number of different measured parameters as shown in the table below.
The minimum value pro- grammed represents the 4 mA output. Page Simulation Mode measures current or control power is cycled, the If the is to be used for training, it might be desirable to allow all parameter averages, statistical information, and event recording to update when operating in simulation mode.
If however, the has been installed and will remain installed on a specific generator, it might be desirable assign a digital input to Test Input and to short that input to prevent all of this data from being corrupted or updated.
Page Test Output Relays The appropriate relay indicator will illuminate at that time. Selecting "Disabled" places the out- put relays back in service. If the measures current or control power is cycled, the force operation of relays setpoint will automatically become disabled and the output relays will revert back to their normal states.
Page Comm Port Monitor Any of the three communications ports may be monitored. After the communications buffers are cleared, any data received from the monitored communications port is stored in Rx1 and Rx2.
If the transmits a message, it appears in the Tx1 and Tx2 buffers. In addition to these buffers, there is a message indicating the status of the last received message. Page Actual value messages are organized into logical groups, or pages, for easy reference, as shown below.
All actual value messages are illustrated and described in blocks throughout this chapter. All values shown in these message illustrations assume that no inputs besides control power are connected to the See page 5— Page A1 Status has not yet been reset, the value reflects an integrated value of both the stator and rotor thermal capacity used.
The values for USED will appear whenever the thermal model picks up on the overload curve. Page Alarm Status 5. The cause of last trip message is updated with the current trip and the screen defaults to that message. Reflects the present negative- NEG. Reflects the Analog Input 4 Name. The Analog Input level is shown here. If the chassis is only partially engaged with the case, this service alarm appears after 1 sec.
Secure the chassis handle to ensure that all Page Latched Trip. Latched Trip. Reflects Input Name Latched Alarm. Page Digital Inputs The messages shown here may be used to monitor digital input status. This may be useful during relay testing or during installation.
The negative- sequence current is defined as the ratio of negative-sequence current to generator rated FLA, I Page Voltage Metering Range: 0. Page Power Metering 0. Value reflects the RTD Name as programmed PERIOD ing window and is ignored when the generator is offline that is, the value that was calculated just prior to going offline will be held until the generator is brought back online and a new calculation is made.
The name of the input and the units will reflect those programmed for each input. This may be useful information for breaker maintenance. The number of breaker operations is incremented whenever the breaker status changes from closed to open and all phase currents are zero. EVENT 0. Page 5. The description of the event is stored and a time and date stamp is also added to the record.
This allows reconstruction of the sequence of events for troubleshooting. In the event of a product software upgrade or service question, the information shown here should be jotted down prior to any inquiry. Pressing the key cycles through the time and date stamp information as well as all of the pre-trip data. Page Flash Messages Flash messages are warning, error, or general information messages that are temporarily displayed in response to certain key presses.
These messages are intended to assist with navigation of the messages by explaining what has hap- pened or by prompting the user to perform certain actions. Page Group 1 as shown on the display. Page Communications One data frame of an asynchronous transmission to or from a is default to 1 start bit, 8 data bits, and 1 stop bit. This produces a bit data frame. Page Algorithm If a Modbus slave device receives a transmission in which an error is indicated by the CRC calculation, the slave device will not respond to the transmission.
Go to the GE Grid Solutions website for more information. Description This product is under last-time buy. Orders may be placed until 31st December , and will be fulfilled based upon availability. As an alternative, please refer to the relay. The SR Generator Protection System, a member of the SR family of relays, provides protection, control and advanced communications in a cost effective industry leading draw-out construction. Designed for small and medium sized generators, the delivers advanced protection including generator stator differential protection.
My Account. Fast Quote. Request a Quote Request Repair. Sell Now Exchange Credit: Learn more about our exchange credit program. It also means that the internal systems are OK and all the input and output are OK. When this light comes on, the unit is programmed. How do I indicate that the is overheating?
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