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Grid Protection Relay The PureCycle power system requires grid protection functions, typically served by a multifunction protective relay provided by the customer. This relay can be programmed to meet the utility’s requirements. Typical trip programming is shown in the table below. Please refer to the Electrical Installation Drawings (HTE73478 or HTE73520) for the programming details. Table 7 – Typical Grid Protection Relay Programming 27 Phase Under Voltage 1,2 59 Phase Over Voltage 1,2 81O Over Frequency 81U Under Frequency The PureCycle system internally monitors power production and consumption. The unit will shut down on low gross power in all power generating states when power is < 80 kW. During states where the unit is expected to motor, shutdown occurs if time exceeds 30 seconds. If reverse power protection is required to provide protection against extended operation as a motor, the customer must procure and install a separate protective relay at the site. The grid protection relay CT’s (current transformers) and PT’s (potential transformers) should be placed at the power wiring going into the PureCycle system AC disconnect switch in a separate enclosure. The ANSI 32 (directional overpower) function should be set to trip for a reverse power greater than the normal power expected during a system start up but less than the no-load amperage of the induction generator for a time greater than the start up period of the induction generator. For example, for a single PureCycle unit with a 300 kVA generator rating, the reverse power setting should be between the KVA of the unloaded motor (√3*460 VAC*57A = 45.4 kVA) and the maximum expected power draw from the support systems during a start up (22*1.25 margin = 28 kVA). This corresponds to - 0.1 PU. The time delay must exceed the maximum motor run times discussed above to assure normal operation (20 + 30) sec*1.25 margin = 62.5 sec). This corresponds to 3750 cycles for 60 Hz. Grounding Plan The PureCycle power system utilizes a single-point ground at the utility interface. The utility provides the electrical ground for the system. This ground is attached to the equipment and chassis grounds for the power module and condenser. The evaporator and other ancillary equipment may require a separate ground. Please refer to the applicable codes for grounding all equipment. Power Factor Correction The PureCycle power system contains power factor correction equipment capable of maintaining a power factor greater than 0.95 lagging. Emergency Stop Button An emergency stop (E-Stop) button is installed on the LOI located on the front panel of the ECS cabinet. This button will cause the safety chain in the system to trip and initiate an emergency shut down. The button will not disconnect the electrical feed to the unit. Therefore, the unit will not go Black when the E-stop button is pushed. Since the E-stop button causes the unit to shut down in an abnormal manner, this is not recommended as a standard method for shutting down the unit. An interface for an optional remote E-stop, is also provided in the ECS cabinet, operates in series with the emergency stop. Please refer to HTE73478 or HTE73520 for further details Control Wiring Requirements Data Connection Remote communications and monitoring of the PureCycle power system requires a dedicated physical high speed broadband connection with a static IP address accessible from the internet. The PWPS warranty requires this high-speed connection. Pratt & Whitney Power System's management server must be able to access the power plant on demand SITE DESIGN REQUIREMENTS Symbol Function Revision B – 09/23/2009 – Page 26 HTE66510PDF Image | PURECYCLE POWER SYSTEM MODEL 280 Application Guide
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