Many revenue meters provide kWh consumption by way of a pulse output (dry contact relay closure). To log kWh from such a meter, you can simply hook the pulse output to one of the 4 pulse inputs DI 1-4 on the GRIDlink. The GRIDlink will take the raw pulse count and multiply by the user specified pulse weight to allow reporting of instant kW and kWh.
Locate the pulse output terminals on the utility meter. Wire the meter’s pulse output terminals to one of the 4 GRIDlink Digital Inputs as shown below. On Form C devices (KYZ), this is the K and Z terminals. (K-Y is normally closed).
The kV2c meter family is a versatile metering platform for commercial and industrial applications. The kV2c meter offers easy and powerful functional upgrades with a unique combination of softswitches and option boards to meet your metering needs in a rapidly evolving smart metering space. Kv2c meter manual kdmobi de. Ge kv2c meter manual pdf download markoleary net. Smart meters aclara technologies llc. Ge kv2c meter manual pdf download readysetgrow org. Gei 52590 fitzall operating guide store gegridsolutions com. Ge energy introduces an enhanced line of meters the. Ge kv2c cl 20 multifunction digital. Aclara KV2C Demand Utility Grade Meter Reads kWh and 15 Min. KW Demand 200 Amps Service Voltages 120/208Y or 277/480 or 120/240 Socket required. 7 Terminal 200 Amp View socket for this meter (4-MS-D7T200SHOB) View the wiring diagram for this meter.
Meter Types
Form A -vs- Form C
A power meter that is listed as Form A indicates that the meter has a pulse output providing a pulse with a two-terminal dry contact. This can be either a mechanical relay or a solid state device. These devices close the contact every time a unit of power has been measured by the meter. The contact is then opened at some interval of time thereafter. (100ms). A form A device is essentially a SPST switch that opens and closes to indicate power consumption.
Form C devices are a little different. A form C device has 3 terminals, often labeled K, Y, and Z. The device will act like a SPDT switch, where K is the common terminal, Z is the Normally Open position, and Y is the normally closed position. When a unit of power has been measured by the meter, the meter *changes* the status of the output relay. If the relay was closed, it is opened, or vice-versa. The meter does not close and re-open the relay automatically.
In the following chart, both Form A and C are shown:
Three pulses are shown, labeled 1, 2, and 3. Notice how the form A output closes and opens for each pulse, where the form C output simply changes state. If you have a Form C device (3 terminals, KYZ), takes this into consideration automatically.
Configuring the Meter Pulse Weight
From the Meter Configuration page:
- There are up to 4 meters available for GRIDlink MV. Enable each meter by clicking the gray “Enable” button.
- Select the Meter Typeto 10. This is the direct connection of all KYZ outputs to GRIDlink on-board Digital Counter Inputs.
- Set the pulse weight. The pulse weight tells GRIDlink how many kWh per pulse the meter reports. For example, if the meter reports 1/10 kWh per pulse, set the pulse weight to 0.1.
- If your selected pulse weight calculates Watt-Hours (normally used on small loads) then click the gray “Read Watts” button. The default is kW.
- The KYZ Input Type default form is “A”. To configure a form”C” click the gray “KYZ input type” button.
The GE kV2c pulse meter shown to the right provides the user with two form C outputs, one form A output, and one Real Time Pricing input to the meter. Kt (is the manufacturer’s nomenclature) of 1.2 represents Watthours.
Using KYZ Pulses to Monitor Demand
Electric demand meters can have a module added to provide a contact indicating the meter disk has rotated a certain amount. Usually the meter output is a Form C relay called the KYZ relay. The K terminal is usually the common on the SPDT relay, the Y contact is Normally Open, and the Z contact is Normally Closed. The relay changes state between open and closed with each rotation or partial rotation, of the meter disk. Each change of state of the KYZ relay is called a pulse. Meters with a KYZ output are called Pulse Meters.
Since the GRIDlink is connected to K and Z, the input to the Controller is then alternating between an open circuit and a closed circuit during successive revolutions or partial revolutions of the disk (successive pulses). GRIDlink uses the pulse weight and the duration of each pulse to determine the demand (instant kW) at any time.
The pulse weight (pulse Constant), Kp, is calculated from the formula where:
If kWh is given
If Kh is given
- Kh = Watthour constant Wh/revolution (in this example represented by Kt 1.2)
- M = Current transformer ratio multiplier (in this example represented by CTR 400)
- PPR = Pulses per revolution, the number of KYZ pulses per revolution (in this example there is no actual disc so we assume PPR = 1)
In this example we are using the Form A pulse output. Answer: Kp = 1.2 x 400/ 1 * 1000 Kp = 0.48
The instantaneous kW is given by:
where Tp is the duration of a pulse in seconds.
Newer electronic meters may not have an actual rotating disk. However, the industry terminology still uses the term disk revolution. You may think of the meter as having a pseudo disk.
Typical KYZ Pulse Input Box
Primary
The Aclara kV2c meter family is one of the most widely accepted ANSI® commercial and industrial meters with over 2 million units deployed in the field since its introduction. The robust revenue-grade meter design is based on Aclara’s cutting edge technology that provides high accuracy and reliability. This fifth generation possesses eight times the processing power and three times the memory of previous models. This allows for future upgrades and new applications without having to replace the meter.
- Reliable and accurate cash register for utilities AMR/AMI Plug and Play to accommodate: RF, power line carrier, cellular
- Revenue assurance using diagnostic and event tools
- Low maintenance and high accuracy over the life of the meter
- Strong overvoltage capabilities – Twice the operating voltage to absorb the system events of the grid
- Adaptive and versatile meter with bidirectional and four quadrant measurements
- Smart metering functions such as Time of Use, demand metering, and reactive measurement
- Advanced power quality monitoring
- Robust meter security and standards compliance
- Polyphase Remote Disconnect is available for unique utility applications
Highly Accurate Measurement
Measured at +/- 0.2 percent, the Aclara kV2 family of meters provides outstanding accuracy. Combined with the low starting watts, utilities can have confidence in the metered value and measured electricity usage. With Aclara’s highly accelerated life testing we are replicating the normal wear and tear that would normally be experienced over the usable lifetime of the product in a shorter amount of time.
Billing and Smart Applications
Traditional billing continues to be a vital role for today’s solid-state meters, but they are also now a critical part of your grid operation. Leveraged strengths and knowledge in distribution automation, volt-var control demand optimization, and distributed generation the Aclara kV2c line of meters provide the integration and critical information to optimize grid operation solutions.
Versatility
The kV2c meter family is a versatile metering platform for commercial and industrial applications. The kV2c meter offers easy and powerful functional upgrades with a unique combination of soft switches and option boards for rapidly evolving smart metering space. The kV2c starts as a bi-directional, coincident demand meter with five demand measures, real-time pricing, and real-time data monitoring.
Soft switches are available to add such functions as TOU, transformer and line loss compensation, power factor, four quadrant measurements, instrument transformer correction, and increased recording channels.
Power Quality
Aclara kV2c meters offer advanced power quality tools to measure compliance to power quality agreements or gather data to set power quality requirements. These tools include:
- Programmable sag and swell monitor that logs voltage sag and swell duration down to one cycle, minimum or maximum voltage, coincident current, and date and time of occurrence.
- Voltage and current THD per phase, Total Demand Distortion (TDD), distortion power factor, and displacement power factor, and distortion kVA (all recordable).
- Harmonic analysis plots odd and even harmonic magnitudes and phase angles.
- Programmable diagnostics for voltage imbalance, distortion, current imbalance, reversed polarity, high neutral current. These events may be logged, set an alert.
Inventory Management
The kV2c wide range voltage power supply (120V to 480V) combined with the Aclara Fitzall®feature enables a significant meter inventory reduction while covering all applications. Fitzall is an Aclara exclusive tool for commercial and industrial electronic meter inventory reduction, which allows two-meter forms, 9S for transformer rated and 16S for self-contained to meter any service type.
Installation Verification and Tamper Detection
The Aclara Site GenieTM Monitor provides a simple, automatic way to catch errors, tampering and wiring changes before billing problems occur. Site Genie also provides the phasor information and diagnostics needed to fix the problems it finds.
Cost of Service Measurements
Knowing what it costs to serve a site is key competitive information for both generation and distribution utilities. The kV2c family of meters simultaneously measures all of the components of service cost (real and reactive – with and without harmonics, distortion, and vector apparent power).
Aclara Kv2c Pocket Guide
Communications
Kv2c Meter Manual Tester
The kV2c offers a wide range of AMI communication technologies including RF Mesh, RF Point-to-multipoint, Cellular, and Power Line Carrier to support your Smart Grid applications. Additionally, the kV2c provides “KYZ” and other I/O options to support local energy management solutions typically found in commercial and industrial facilities. The kV2c has a standard AMI interface that allows the capability to transmit all metering data available at the meter through the AMI communications network.
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