Basic Programming Concepts. Presented by: Chris Lindsay-Smith McAvoy & Markham/Itron 2015 Northwest Electric Meter School

Transcription

1 Basic Programming Concepts Presented by: Chris Lindsay-Smith McAvoy & Markham/Itron 2015 Northwest Electric Meter School

2 Agenda Programming software Importance of keeping computer updated Discuss items in a demand meter program Differences between singlephase and three-phase meter configurations Optical probe configuration Windows device manager 2

3 Meter Programming Software In order to configure a solid-state electric meter it is necessary to use software to send the configuration to the meter Typically done at the utility metershop or in the field with an optical probe Can also be done via remote communication AMI system, cellular, analog telephone, etc May need meter password or encryption key to successfully initialize or reconfigure a meter 3

4 Meter Programming Software Use the appropriate program for the type of meter being configured Sign up for download capability before it is needed don't wait until billing day! Develop a good method for tracking program changes and revision history Keep a backup of meter programs Export to a location other than the computer being used for programming 4

5 Keeping Up-to-Date Just as it is a good practice to keep the operating system up-to-date with security patches, it is also important to keep the meter programming software up-to-date Repairs software bugs Works with current operating system Avoids unforeseen issues in the field Makes it easier to get timely technical support 5

6 Demand Meter Program Let's discuss the construction of a demand meter program What are the typical components? Method of demand calculation TOU calendar, if applicable Display items Diagnostic items Demand interval length (normal and test) Event log ERT configuration, if applicable 6

7 Methods of Demand Calculation There are two types of demand calculation Block demand Rolling demand Maximum demand calculated as the maximum average value over the interval length Maximum demand calculated as the maximum average value within the subintervals over the interval length It is important to know what method of calculation is called out in your utility's tarriff so the meter can be properly programmed 7

8 Methods of Demand Calculation Maximum Demand Power (kw) Interval 3 Interval 1 3 Interval 4 Interval Time (minutes) 8

9 Methods of Demand Calculation 9

10 Demand Interval Length Demand interval length is defined in the program Block demand requires only the length of the interval to be defined Rolling demand requires the interval length and number of subintervals to be defined Cold load pickup time can be defined Grace period before the meter begins to calculate demand 10

11 Time of Use Registers Time of use (TOU) register(s) may be calculated in the meter Requires loading a TOU schedule which defines seasons, day types, rate patterns, and holidays The active rate should show on the meter's display Program a demand reset at season change 11

12 Meter Display The items to display on the meter are typically determined by the tarriff and the requirements of the meter reading department There are three modes Normal, alternate, and test Alternate mode is used by the meter department Test mode is used by the meter department and sometimes the customer 12

13 Meter Display Normal mode typically shows kwh and max kw A quantity code may be used to identify values Diagnostic information is typically in the other display modes Potential indicators Disk emulator (porportional to Kh) Show primary units TOU rate 13

14 Meter Diagnostics One of the benefits of solid-state meters is the ability, with even a demand meter, to analyze the electric service Typical values include Phasor wheel Instantaneous W, VAR, VA Instantaneous per-phase V&I Polarity check Phase angle check 14

15 Meter Diagnostics 15

16 Event Log/Service Configuration The event log can be used to track changes to the meter In a non-time aware meter, one will know the event occurred, but not when Service configuration is used to tell the meter the sort of service to measure Typically auto-senses In a time aware meter, the method of clock synchronization can typically be set here 16

17 Communications The meter may be programmable and have a communications module It is important to configure it to transmit the proper register(s) and correct number of digits and decimals Other items to consider for configuring communications Baud rate Sequence of transmission Module ID number 17

18 Types of Communication Modules Radio Frequency (1-way or 2-way) Power Line Carrier Analog Telephone Modem Cellular Modem (2G, 3G, 4G) Ethernet (Cabled or Wi-Fi) ERT 18

19 Thank you for your attention Any questions before concluding? 19