Comparison between Doble F6150 and Omicron CMC 356

Introduction : Doble F6150 and Omicron CMC 356

Several people do ask what their best protective relay test-set really is; they have difficulties in deciding what protective relay is best for their organization or business. However, deciding on the best test-set for you should at least involve some research, but do not worry, we’ve took it upon ourselves at kaaraba.com to compare and contrast and also show you the demonstration from the protective relay test-set vendors, so that you can choose  which one fits your organization’s needs and relay testers’ requirements.
This post discusses and aimed at showing the comparison and or contrasting features of the Doble F6150 and Omicron CMC 356, which we hope will help you make an informed decision.

Protection Relay Test-Set Current Amplifiers

Below is a quick outline of the current amplifier specifications of the Doble F6150 and Omicron CMC 356 from the major test-set manufacturers’ specification sheets, they are arranged in alphabetical order:
Doble F6150SVOmicron CMC 356
3-Phase Max Current35 A (70 A*)64 A
3-Phase Max VA75 VA (262.5 VA*)860 VA
3-Phase Current (V)50 V rms
6-Phase Max Current17.5 A (35 A*)32 A
6-Phase Max VA87.5 VA (131.25 VA*)430 VA
6-Phase Max Current (V)35 V peak
1-Phase Max Current105 A (210 A*)128 A
1-Phase Max VA525 VA (787.5 VA*)1740 VA
1-Phase Max Current (V)140 V Peak

Current Amplifier Magnitude

Although both the Doble F6150 and Omicron CMC 356 generate approximately the same amount of current, the Omicron is proven to be able to generate that current for a long period of time.  However, this should not be something of great concern during standard protection relay testing because ideally, a protective relays should be able operate faster at higher currents. Meanwhile, if under any circumstances you need more current than what is shown in the specifications, it is very simple because all of the manufacturers have amplifier units which they can use to generate additional current channels if need be.

Current Amplifier Compliance Voltage

According to the specification, the CMC 356 (single-phase) specifications is higher, so because of this specification there are a number of relays that the CMC 356 will be able to test which the Doble F6150 cannot test.
When taking a critical look, The Doble F6150 does not list the compliance voltage in its specification; however, we can equally guess that it is lower than the CMC 356 due to the fact that the VA is drastically lower. The Doble F6150 has convertible voltage channels, so in this case, assuming one of the relays you want to test requires more than 99Vrms or 140Vpeak, then you may want to give the Doble some bonus points, in as much as test requires less than 9.0A, and you are prepared to change leads frequently between tests on other, most likely more common, relays.

Reliability and Customer Support

Customer support and Hardware reliability can be extremely important issues that can be somehow difficult to judge or evaluate until you are a customer. It is proven beyond reasonable doubt that the CMC 356 happens to be the most reliable test-set, and as well given additional points on the reliability front.

Protection Relay Test-Set Voltage Amplifiers

The main voltage amplifier specifications are listed  below:
Doble F6150SVOmicron CMC 356
4-Phase Max Voltage300 V*300 V
4-Phase Max VA75 VA75 VA
1-Phase Max Voltage600 V600 V
1-Phase Max VA300 VA275 VA
DC Voltage6 – 300VDC0 – 264 VDC
DC Voltage Watts90 W50 W
* 6-voltage channels are available

What do these specifications really mean?

Obviously, Doble F6150 and Omicron CMC 356 can provide a power supply for a relay, and also supply three-phase voltages up to the specifications we have listed above. The Doble F6150 is capable of powering a relay and also supplies six voltages concurrently, while the CMC 356 can power the relay with four dedicated voltages respectively. Both test-sets can test six-phase voltage balance relays; however, the Omicron CMC 356 requires some complicated wiring connections in order to do this.
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