Voltage & Current Sensor

We provide Voltage Sensor, Current Sensor and Grid Intelligent Monitoring unit from Zelisko. They are majority used in ABB RMU, Siemens RMU, Schneider RMU in Thailand. With this sensor and monitoring unit, there is no need for the conventional big block type voltage transformer and/or big ring type current tranformer (the more burden required, the bigger the unit is). This Voltage & Current Sensor with grid intelligent monitor for medium voltage system, therefore, are very compact and useful for remote monitoring in Smart Grid of MEA and PEA.

Voltage Sensor

The voltage sensor is specially designed to connect at the back of the plug in Tee connector that connected to the bushing of the ringmain unit. It has to be specified with the required primary voltage that is the same as operating voltage of the ringmain unit. The secondary voltage, burden and impedance shall be matched with the monitoring unit. Zelisko also provide Grid Intelligent Monitoring unit namely GIM. Below is the specification of Voltage Sensor

Model: SMVS – UW1001, SMVS – UW1002-0, SMVS – UW1002-1 & SMVS – UW1002-2

Insulation level	max. 36 / 70 / 170 kV
Rated frequency	50 Hz / 60 Hz
Rated voltages	max. 30/√3 kV
Voltage factor	1,2 Un and 1 9 Un 8h
Accuracy class / Protection class	0,5 / 1 / 3 // 3P / 6P
Rated secondary voltage	3,25/√3 V (or on request)
Standard	IEC60044-7
External conditions	Operation: -25°C to +55°C or -40°C to +40°C *
	Storage: -40°C to +80°C (or on request)
Rated burden	200kΩ +1% Genauigkeit, 350 pF +10% * this value is for Zelisko GIM
Overvoltage protection	Internal surge arrester
Cable connector type	UW1002-3: Euromold K480TB
	UW1001: Euromold K440TB, K400TB

Current Sensor

The current sensor is simply a window or ring type current transformer but with small burden. Only small current shall be fed to the Grid Intelligent monitor unit. It has to be specified with the required primary current designed by the feeder load. The secondary current, burden and impedance shall be matched with the monitoring unit. THis current sensor can be a fix window or a split window type. With the split window, there is no worry about the size of the Tee conector. Zelisko also provide Grid Intelligent Monitoring unit namely GIM. Below is the specification of Current Sensor.

Model: SMCS/T – JW1002 & SMCS – JW1001

Insulation level	0,72 / 3 kV
Rated frequency	50 Hz / 60 Hz
Rated short time thermal current	25 kA / 1 s
Primary current	300 A; Ext. 200% *
Accuracy class	1&5P10…5P20
Output signal	225 mV according to IEC 60044-8
Standard	IEC 60044-8
External conditions	Operation: -25°C to +55°C or -40°C to +40°C
	Storage: -40°C to +80°C, on request
Rated burden	≥ 20 kΩ

Grid Intelligent Monitor

As we call it Grid Intelligent Monitor, it is a Digital short-circuit and ground fault indicator with measuring function. it is a smart device that get input from the corresponding voltage sensor and corresponding current sensor. it offers a complate portfolio for network monitoring, power quality recording, fault recording, phasor measurement. it is designed for Zelisko low-power sensor technology in accordance with IEC 60044. It is optionally be with Modbus RTU interface. Below is the specification;

Communication:	Auxiliary voltage:
Interface RS485 incl. Modbus RTU communication for all data and remote configuration	AC 230 V, DC 24 – 110 V Battery with service life > 15 years
Signalization:	Inputs:
Display for visualization of current measured values or fault information in the distribution network, 4 function keys 3 LEDs to signal the operating mode 2 binary outputs	3 inputs from Zelisko Voltage sensor 3 inputs from Zelisko Current sensor
Measured variables:	Housing:
RMS measured values Phase voltages and currents, ground current, power system frequency and cos φ phase angle, active power, reactive power and apparent power Energy meters Minimum and maximum values for all phase currents from 15 minutes to one year as a slave pointer function	Polycarbonate, for panel flush mounting Dimensions: 96 x 48 x 109.5 mm (W / H / D) Protection class: Front IP40, rear IP20
Time synchronization:	Temperature range:
Time synchronization via Modus RTU	From -40 °C to +70 °C