Siemens SG8158-00 Metered Data, Current Values, Voltage Values, Power Values, Frequency Values

Data Acquisition

7

7.4 Metered Data

Metered data is stored by the ISGS relay and can be dis- played by accessing address blocks 4100 to 4900. The dis- play of this data does not require a password. You can display the same data more conveniently by using Wisdom software described in Chapter 8.

7.4.1Current Values

The Current Metering function stores the metered current and current demand values for the ISGS relay. The relay will measure and display the rms values of the current for the three phases and ground or neutral. The ISGS relay also shows total harmonic distortion as a percentage of the fun- damental for the three phase current inputs. This function displays undefined when the measured components are below the total harmonic distortion threshold.

4100	Current Metering
Address	Data	Range￿
4101	I Phase A	0-250% ICT
4102	I Phase B	0-250% ICT
4103	I Phase C	0-250% ICT
4104	I Neutral	0-250% ICT
4105	I Average	0-250% ICT
4106	I Demand Phase A	0-250% ICT
4107	I Demand Phase B	0-250% ICT
4108	I Demand Phase C	0-250% ICT
4109	I Demand Average	0-250% ICT
￿ 4110	THD Current	0-250% ICT

ICT = primary CT rating

7.4.2Voltage Values

The Voltage Metering function allows the display of metered voltage data for the ISGS relay. The rms voltage measure- ments for this function depend on the selected VT connec- tion method, either line-to-ground or line-to-line. The relay also shows total harmonic distortion as a percentage of the fundamental for the three phase voltage inputs. It displays undefined when the measured components are below the total harmonic distortion threshold. This function is only avail- able if the voltage input option is installed.

4200	Voltage Metering
Address	Data	Range￿
4201	V Phases A-B	10-125% Vn
4202	V Phases B-C	10-125% Vn
4203	V Phases C-A	10-125% Vn
4204	V L-L Average	10-125% Vn
￿ 4209	THD Volts	10-125% Vn

IVT = primary VT rating

7.4.3Power Values

The Power Metering function stores the metered voltage data for the ISGS relay. This function is only available if the voltage input option is installed.

4300	Power Metering
Address	Data	Range
4301	kW 3-Phase	0-999,999.99 kW
4302	kW Hours	0-999,999.99 kWHR
4303	kW Demand	0-999,999.99 kWD
4304	kVA 3-Phase	0-999,999.99 kVA
4305	kVAR 3-Phase	0-999,999.99 kVAR
4306	kVAR Hours	0-999,999.99 kVARH
4307	PF	-1 — 0 — +1

7.4.4Frequency Values

The Frequency Metering function allows the display of the system frequency. This function is only available if the voltage input option is installed.

4400	Frequency Metering
Address	Data	Range
4401	Frequency	45-65 Hz

46 Siemens Energy & Automation, Inc.