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Setra Blog

Nikko Phongchit

Recent Posts

June 29, 2017

What do electrical contractors look for in a power meter?

User-side energy submetering is becoming increasingly popular in new commercial construction and renovation projects alike. The latest advanced LEED certification requires operator-owned submeters to be installed in high consumption areas and facilitate continuous tracking of total consumption for an entire structure.

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June 08, 2017

What is Total Harmonic Distortion?

Imagine a tone being played by two musical instruments -  let’s say middle-C (261.63 Hz). While the pitch played on a piano may be the same as on an electric guitar, its timbre is very different. The sound wave generated from a piano or a simple synthesizer is relatively simple and clean, but the sound wave coming from an electric guitar is often very distorted for effect and contains natural harmonic overtones.

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June 01, 2017

What is the difference between Rogowski Coils and conventional CTs?

Understanding specific job requirements, such as performance, installation, amperage load and environmental factors is critical to selecting the proper current transformer for an application. Conventional current transformers (CTs) come with their limitations as they are difficult to install and are lacking in performance and measurement range. Rogowski coils have significant advantages with regards to installation, cost and performance.

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May 04, 2017

Is Building Automation and the Internet of Things Related?

The Internet of Things (IoT) is changing the way people run their homes. More and more devices are becoming available to consumers that allow them to automate their thermostats and regulate their power consumption, often-times controlling these systems from the phone in their pocket. Products like the Nest thermostat and the Sense home energy monitor provide homeowners convenient tools that also help save utility costs.

Building Automation

In commercial and industrial buildings, there are similar (albeit far more robust) systems and protocols used for the same purposes called building automation. Building automation is the automatic and centralized control of a building’s heating, ventilation, air conditioning, security, electrical, and other systems through a Building Automation System (BAS).

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March 23, 2017

What is peak demand?

Looking at your electric bill can be a daunting task. There are many factors that can affect your bill’s total — factors that are only amplified in large commercial and industrial sites.

One such consideration is peak demand. Peak demand is the largest instance of power usage in a given time frame, typically a rolling fifteen minute window. Measured in kilowatts (kW), peak demand is different than consumption. Total consumption  is measured in kilowatt hours (kWh) over a given period of time (e.g. monthly, quarterly, etc.). 
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March 16, 2017

What is power factor?

The power flowing through an alternating current (AC) load isn’t always pulling its full weight. Every AC circuit has some degree of non-working power as part of its total power reading and this can affect the amount of power a system is truly drawing.

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February 21, 2017

Can I Put a Power Meter Inside an Electrical Panel?

Can you? Of course you can place a power meter inside an electrical panel depending on the type of power meter. The great advantage of UL61010 vs. UL508, is that UL61010 allows for a meter to be mounted inside of an electrical panel, avoiding costs of installation and additional equipment required. The 61010-1 safety standard states meters must be connected to a dedicated circuit breaker, but does not require the use of fused voltage leads is required as the circuit breaker is present to protect the wiring should an overcurrent situation oc

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July 21, 2016

What is the difference between BACnet, Modbus and LonWorks?

Until recently, there was no standard industry network protocol for building automation, and users had to choose between many different systems from different manufacturers. Proprietary communications were a result of no off-the shelf communication solution. Today, we have reached a place where there are three inter-operable standard network protocols to choose from: BACnet, LonWorks and Modbus. All three are widely used, and according to a Building Operating Management survey in 2011, 62% of respondents had at least one BACnet application; for LonWorks the percentage was 40%, while for Modbus the number was 30%.

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March 07, 2016

What is CRC ERROR?

Cyclic Redundancy Check (CRC) Error indicates when data is corrupted. Calculating from all data, CRC validates packets of information sent by devices and verifies it against the data extracted, ensuring its accuracy. When sending packets over,BACnet automatically calculates and stores a CRC value for the packet. Later when the packet is received, BACnet calculates the CRC value of the packet and compares it to the original value. If the two values do not exactly match a CRC error occurs.

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March 03, 2016

Placing Multiple Current Transformers in a Single Channel

We didn’t say it was easy monitoring energy. While monitoring energy consumption, it may be overwhelming to manage numerous appliances using a power meter. To keep management simple, you can measure several different circuits by placing multiple current transformers within a single channel. However, this can only be done if all circuits are powered from the same phase of electrical circuits. This method is useful to combine all circuits into one measurement, oversee all appliances or to measure energy used for lighting. By placing multiple (2+) light circuits in a single current transformer (CT) you can capture more light circuits with bundled inputs. The maximum amount of CT’s per channel is limited to the gauge of the wire to fit in the terminal block. Placing multiple CT’s per channel has both its advantages and disadvantages:

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