Meters Performance Guide

Transcription

1 MEASUREMENT & VERIFICATION SYSTEM FOR NEW MEXICO PUBLIC SCHOOLS Meters Performance Guide Revised on: March 20, 2017 Hisham Tariq Environmental Operations Engineer

2 Contents 1. System Description Onicon D Quickserver Water Meter Gas Meter Electric Meter Current Transformer for Electric Meter Communicator Ext software Network Settings

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4 1. System Description Utility data (electric, water and gas) from the school is collected by the meters. Those meter includes electric, water and gas meter. For measuring electric power there are generally 3 meters used by PSFA in each school as shown in the schematic diagram on page 2. There is one main meter (Shark-200) which is mandatory in each PSFA M&V system equipped school, and there are two sub-meters (Shark-100) for measuring total lighting and plug load of the school. Plug load doesn t include HVAC systems. Sub-meters in school is not mandatory and is dependent on PSFA budget and individual school requirements. Total gas consumption is measured in school by Onicon F5500 meter and water consumption through Onicon F3100. These gas and water meters connects to D-100. D-100 is used to transmit water, gas rate & total data to the Quickserver. The Quickserver then sends data to the Field server placed at UNM. Integration of the D-100 to the schools Facility Management System (FMS) is dependent on the school s district requirements. 2. Onicon D-100 D-100 with Modbus RTU RS-485 (two wire connection), shown on page 2, is used to transmit water, gas rate & total data to the Quickserver. In instances when district wants the display of the data in FMS then D- 100 with Dual net may be selected. Dual net card enables having both RS-485 (two wire connection) and a RJ-45 (Ethernet) connection. Generally, specifications of D-100 shall read D-100-MODbus-RTU-Aux or if district wants display of data in FMS then D-100-Dual-ModRTU- BAC-IP-Aux. Aux is to ensure that comm. card comes with auxiliary pulse input terminals for totalizing pulse outputs from external devices such as water or gas meters (which is an option and would not normally come on the comm. card). D100 is powered through 120 VAC supply, as shown on page 2. Generally from D-100, power supply terminal (T4-1 & T4-2) is used to power only F-5500 (Onicon Gas Meter). These terminals provides 24 VDC to Onicon Gas meter. This source does not have enough capacity to power any additional meter, for example F F3100 can derive power by piggy backing from D100 supply as long as both models have same input. Standard being the 24 VAC selection. Power to Quickserver is generally not drawn from D-100, a separate transformer can be install to supply 24 VAC to the Quickserver. Refer to D-100 Manual and Network interface guide for proper wiring and networking instructions. 3

5 ONICON D-100 4

6 3. Quickserver Quickserver for PSFA s M&V system shall have BACNET IP, MODBUS RTU, and HTTPS-XML. BACNET IP is for connection to the schools FMS (Depends on district requirement), while HTTPS-XML is used for transferring metering data to UNM. Quickserver models having required specifications are FS-QS or FS- QS BACNET IP, Modbus RTU, HTTPS-XML 1140 BACnet IP, MODBUS RTU, Modbus TCP, HTTPS-XML Generally, a separate transformer may be installed to supply 24 VAC to the Quickserver as shown in schematic diagram on page 2. D-100 and Electric meters are daisy chained to R2 port on Quickserver. 4. Water Meter This shall be a Primary meter. Generally, specify F-3100 magnetic to read water data. High-frequency pulse from F-3100 reads both rate and total of flow. Wires from F-3100 land on Di2 (Frequency (+) & Frequency (-)) of D-100. The ground shall be provided to Electromagnetic F-3100 meter. Shield and earth connections are required for proper operation. Failure to use shielded cable or to connect earth to both the flow meter and D- 100 may result in erratic operation. Shields should be terminated at the D-100 shield terminals and left unterminated at the flow meter. See Onicon F-3100 Inline Electromagnetic Flow Meter Manual for detailed wiring instructions. 5. Gas Meter As shown on page 2, Onicon F5500 reads the total gas consumption at school. Wires from F-5500 land on Analog Input (Ai3) and Digital Input (Di3) of D

7 Analog signal input from meter connects to "Signal-Ref" terminals on T3-1 and T3-2 section of D-100. Pulse input location (Di3) for the F5500 gas meter is shown in figure on the comm. card in the Aux input terminals. For Di3, expansion port is installed on the left side of the circuit. Shield connections are required for a proper operation. Failure to use shielded cable or to properly terminate shield connections may result in erratic operation. Shields shall be terminated in the D-100 at the terminals provided. The shield connection at the flow meter shall be left unterminated. See Onicon F-5500 Flow Meter Manual for detailed wiring instructions. Wires from F-5500 connected to Di3 RS-485 heading to D-100 RS-485 from Shark-200, daisy chained Card on Expansion Slot H3 on D-100 6

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9 6. Electric Meter Shark meter-200-modbus RTU, as shown on page 2, measures total power consumption at school. For sub-metering, Shark-100-Modbus RTU meters are used. Electric meters and D-100 transfer data to Quickserver through RS-485 as shown below. In projects where power panels are distributed, consider using Summation CT instead of installing separate meters at every panel in schools. When installing summation CT use appropriate length required for installation without compromising the accuracy of the measured data. Shark 200 needs to be specified with 64 samples per cycle Waveform Recorder and 3 Megabytes of memory for Data-logging - V5, and Shark 100 with Energy Counter- V3. See Shark meters manual for detailed wiring and installation instructions. Quickserver and Onicon F-3100 grounded from D

10 7. Selection of Current Transformer for Electric Meter Specify three (3) current transformers (CTs) per meter matched to the panel capacity and conductor size. Current transformers (CT s) should be sized to read from ¼ amp and up to the maximum rating of the CT. If the CT is rated 3000/5 amps it will produce 5 amps on the secondary for 3000 amp on the primary coil, then 1500 amps on primary would produce 2.5 amps on secondary and therefore, 150 amps would produce ¼ of an amp output from the CT and this is where the CT accuracy falls of dramatically Overloading CT Current transformers may be overloaded without a loss of accuracy. This overload rating is known as the rating factor (RF). When sizing CT s, normally use the lowest ratio available while utilizing the RF rating of the CT. For example, assume a meter load that may occasionally reach 1200 amps. However, the load may also be as little as 40 amps. By utilizing a 400/5 CT with an RF of 3.0, the CT can easily handle 1200 amps with no loss of accuracy while sending 15 amps to the meter CT Wire Length In general, it is not recommended anything more than ft. away from the meter to the CT. However in cases where it is required then CT should be selected with high burden rating (see burden rating in section 7.3). CT with high burden rating can be extended much further from meter based on the Table 1. Shark meters are rated by a Class designation and the number identifies the maximum current input to the meter. The Shark 200 and 100 units are a class 10 meter and therefore can handle up to 10 amps Selection of CT should be based on Total Demand current ( or Total Connected Current) and downgrade it to nearest available CT. for example 1034 Amps to 800 or 1000 Amps CT with RF of Burden Rating The secondary load of a current transformer is termed the "burden" to distinguish it from the primary load. CT with high burden rating means it can be connected to more load on secondary side. The load on the secondary coil side of CT is the Meter and the wiring resistance. The Meter resistance is fixed and in case of shark meter its 0.05 VA, the wiring resistance varies with the length of the wire as shown below: Where, is the density; for copper = 1.72 x 10-8.m A is the cross sectional area; for wire A= r 2 And L is the length of copper wire R = L A 9

11 As seen from Table 1. The length of wire associated with CT is dependent on the burden rating of CT and for every burden rating, lowering the AWG results in increase in wire length. Lowering the AWG increases the wire diameter and thus reduces the resistance offered and that s why to offer same resistance wire Length is increased. Also note that lower than 10 AWG cannot connect to shark meter, this is the lowest size possible for connection to shark meter. Table 1 Current Transformer Wire Length Chart 10

12 8. Communicator Ext software Communicator Ext software is not required for installation purposes. PSFA has licensed pro version of Communicator Ext, and if needed free version can be downloaded from the website: 9. Network Settings Quickserver and Shark-200 meter should be provided external IP. Those external IPs are used by PSFA to access system for troubleshooting. In case if the district does not have IPs available, they need to provide VPN access to PSFA. Quickserver send data at every 15 sec interval to Fieldserver IP (Receiving server address) 11

13 ABC School D100 Modbus Address 004 Shark 200 Modbus Address Shark 100 Modbus Address (Plug Load) Shark 100 Modbus Address (Lighting) Modbus network settings 9600, 8, N, 1 Quickserver Shark200 Internal IP Subnet Mask Gateway Address School # Setting * - DNS #1 IP DNS #2 IP Field Server IP BAcnet Instance External IP Address Admin Password MAC Address *School# should be assigned after consultation from PSFA. Conflict in school# can cause overlap of data at PSFA servers. After completion of project, fill in the above table and to PSFA Operations Engineer on htariq@nmpsfa.org Before finalizing any submittals, the orders need to be reviewed by PSFA Operation Engineer. 12