ANNEX B TERMS OF REFERENCE FOR THE DESIGN OF A LOW VOLTAGE POWER NETWORK FOR IMS STATIONS IN WARRAMUNGA, AUSTRALIA

Transcription

1 ANNEX B TERMS OF REFERENCE FOR THE DESIGN OF A LOW VOLTAGE POWER NETWORK FOR IMS STATIONS IN WARRAMUNGA, AUSTRALIA Page 1 of 9

2 Table of Contents 1 Introduction Background Work Tasks Work Task 1: On-Site Visit Work Task 2: Power System Design Requirements for the Contractor Deliverables Work schedule... 6 Page 2 of 9

3 1 Introduction The Preparatory Commission of the Nuclear-Test-Ban treaty Organization (hereinafter referred to as the Commission ) desires to engage a contractor (hereinafter referred to as the Contractor ) to design a power system that incorporates diesel generators and an existing solar array for Primary Seismic Station PS02 and Infrasound Station IS07, Warramunga, Australia (hereinafter interchangeably referred to as the Work or the Contract ). The (ToR) defines the scope of work and technical framework of the Contract, as well as all minimum technical requirements the Contractor shall meet. The Primary Seismic Station PS02 and the Infrasound Station IS07, Warramunga, Australia will hereinafter be referred to as the Stations. The scope of this work is restricted to the Stations Central Recording Facility (CRF), which is located at S and E. 2 Background The CRF consists of four structures relevant to this project (Figure 1): (1) the Main Building; (2) the Solar Array; (3) the Generator Shed and (4) the Equipment Container, whereat (4) is located beneath the solar array. The Main Building is featuring facilities for the on-site staff. The power consumption varies between 2kW and 6kW. It is directly powered by two Diesel generators located in the Generator Shed. A buried conduit connects the Main Building with the Generator Shed. The voltage is 240VAC. The Solar Array is designed to produce 48kWh per day. The voltage is 120VDC, which is converted into 240VAC. A large battery bank and the Equipment Container are installed underneath the Solar Array. The Commission s data acquisition system is installed inside the Equipment Container with a consumption (incl. air-conditioning) of approximately 1kW. The Equipment Container is powered by the Solar Array only and is its only consumer. Conduits for data and power cables connect the Equipment Container with the Main Building. 3 Work Tasks The aim of this project is to provide the Commission with a complete design study on how to improve the power supply system at the CRF. 3.1 Work Task 1: On-Site Visit The Contractor or his representative shall visit the CRF and meet with the local Station Operator and eventually a representative of the Commission. The Commission will provide contact details and may help with arrangements regarding the visit. Page 3 of 9

4 On-site, the Contractor shall familiarize himself with the CRF s power system and components and shall document every aspect of the system relevant to Work Task Work Task 2: Power System Design The Contractor shall document the present power system, power consumption and power consumers at the CRF and shall propose an improved design that makes the most efficient use of the Solar Array, while integrating back-up generators that automatically start / shut down (for a schematically drawing of the power system see Figure 2). Thereby, it is important to note that the Equipment Container is the prioritized consumer of the power system. The Contractor shall develop a design that should fulfil, at the minimum, the following requirements: - Only excess energy shall be diverted from the Solar Array to the Main Building, i.e. the Main Building may only be powered by the Solar Array if the battery bank is completely charged or nearly completely charged. This point is a requirement. - The old generators shall be replaced with new, low-maintenance and fuel-efficient ones. The generators must run stable at loads between 500W and 6kW. The Contractor shall suggest how many generators should be installed in order to deal best with the range of power consumption (two or three generators are expected by the Commission). The maximum load shall be generated by running all generators simultaneously under normal circumstances, only one generator shall run. - The Contractor shall suggest whether to use 1-phase or 3-phase electrical power. - If only one generator is required to run, the generator in use should alternate in order to avoid that one generator stands still for extended periods of time. - An electric meter shall be installed between the generators and the Main Building. - Two electric meters shall be installed between the switchboard (Figure 2) and the Solar Array. One to measure the energy provided by the generator to charge the battery bank and one to measure the energy provided by the Solar Array to the Main Building. - The generators should automatically shut down if no load is connected and automatically start again if required. - If the state of charge (SOC) of the battery bank drops below 60% or another value suggested by the Contractor, at least one generator shall automatically start and recharge the battery bank. - The electric meters as well as current and voltage at each electric meters and the status of each generator (on/off) shall be recorded and further remotely accessible. - The Contractor shall further evaluate all existing air-conditioning units and power consumers and components (lighting, surge protection, RCBs, etc.) and shall suggest a more energy efficient and safe design, if applicable. - If a large consumer (e.g. an air-conditioning unit) is switched on, another generator may have to switch on first to provide the power. The Contractor shall consider the delay between power demand and power supply in his design and shall suggest a solution (e.g. power-up delay switches, etc.) - The Contractor shall suggest a temporary power solution to power the Main Building while the power system is upgraded. Page 4 of 9

5 In order to fulfil above requirements, the Contractor shall design the Switchboard, or, if such equipment if available off-the-shelf, shall suggest model and type. The Switchboard shall have an Ethernet connection with an IP that can be set to the Commission s IP range. The Switchboard shall be placed in the Generator Shed, where temperatures can be extremely high. The Switchboard must thus be of IP67 standard and withstand temperatures up to 70 C. All relevant information will be retrieved remotely via this connection. Further, the Contractor shall list all required equipment and components (incl. the generators) and shall evaluate the required civil work. The Contractor shall also evaluate the quality of the grounding system and shall suggest improvements, if applicable. 4 Requirements for the Contractor The Contractor is required to have excellent knowledge and long-time experience in electrical engineering. The Contractor shall meet all of the requirements listed below: 4.1 The Contractor shall be an established engineering or electrician company, ideally with experience in installing and maintaining solar arrays and Diesel generators. The Contractor s personnel and /or subcontractor visiting the CRF (Work Task 1) must be an electrician or electrical engineer with at least five (-5-) years experience in either a) installing or maintaining solar systems, b) installing or maintaining back-up power systems in e.g. hospitals, etc. c) connecting buildings to main power grids. 4.2 The Contractor must be sufficiently large and stable in order to guarantee the level of support foreseen in these ToR. 4.3 The Contractor shall have the capacity to send their personnel and /or subcontractor to Northern Territory, Australia. 5 Deliverables The Contractor shall deliver a comprehensive Design Report, which should provide with a Power System Design that should allow the Commission to: - procure all required equipment from any supplier on the market; - have the switchboard custom-made by any electrical supplier, if applicable; - have the system installed by any electrical engineering / construction company. Page 5 of 9

6 The Design Report shall be delivered electronically in MS Word format or in Portable Document Format (PDF). The entire content of the report shall be in English. The Design Report shall include, but is not limited to: - Electrical drawings of the current system - Electrical drawings of the suggested system - Photographs from the on-site visit - A list of equipment/components required for the new power system - Specifics on the required civil work - Complete design of the Switchboard including circuit board layout and required components, if applicable - Suggested locations for the installation of the Switchboard - Suggestions on how to improve the grounding, if applicable 6 Work schedule 1. The On-site visit shall take place within six (-6-) weeks after entry into force of the Contract, unless the local Station operator is not available, in which case the Commission and the Contractor will agree on another date. 2. The Design Report shall be submitted to the Commission no later than six (-6-) weeks after the completion of the on-site visit. The Commission shall be given two (-2-) weeks to either accept the Design Report or to request revisions from the Contractor. If revisions are requested, the Contractor shall submit the revised report within two (-2-) weeks after the request. The Commission shall then again have two weeks to review the revised Design Report. Page 6 of 9

7 Figures Figure 1: Central Recording Facility for IMS Stations PS02 and IS07. Page 7 of 9

8 Figure 2: Site Plan developed under a recent civil work project. CRF Building refers to (1) in Figure 1; the box around the Battery Enclosure refers to the Solar Array (2); the dashed box to the right of the Battery Enclosure refers to the Equipment Container (4); The Fuel Depot refers to (3); Shed is not of importance. Page 8 of 9

9 Figure 3: Schematically diagram of the power grid. Page 9 of 9