LTVT Metering Unit/ MD(Maximum Demand) Meter

Metering Unit

Specification

Maximum Voltage (kV, rms)

15.5 kV

Rated Frequency (fR)

50/60Hz

Rated lightning impulse withstand voltage (peak)

95kV

Rated power-frequency withstand voltage on primary

35kV

Rated power-frequency withstand voltage on secondary

2.5kV

Number of CTs and VTs

3VT+3CT

IP grade

IP65

Applicable standards

IEEE(ANSI) C57.13-2006

IEC 61869-1:2007, IEC 61869-2:2012

IEC 61869-3:2011, IEC 61869-4:2013

Current Transformer

Specification

Rated primary current

5A up to 800A

Rated secondary current

1A to 5A

Rated continuous thermal current

150%, 200% or 300%

Rated short time current (Ith) (thermal 1 second)

80*Ipr

Rated dynamic current (Idyn)

2.5*Ith

Rated burden

B-0.1,B-0.2,B-0.5,B-0.9

Accuracy class

0.15S,0.15,0.3,0.6,1.2 Metering

Applicable standard

IEEE C57.13-2006

Voltage Transformer

Specification

Rated primary voltage（V)

12000, 13200, 14400

Rated secondary voltage(V)

110/√3,115/√3, 120/√3, 110,115,120

Rated voltage factor

1.1/Continuous

1.25/8h,1.4/1min.,1.5/1min.,1.73/1min.

1.5/30s，1.9/30s，1.9/8h

Standard connection

Y-Y connection for 3CT+3VT

Rated burden

W,X,M,Y,Z

Accuracy Class

0.15,0.3,0.6,1.2 Metering

Thermal burden(VA)

500,750,1000,1200,1500,etc.

Applicable standard

IEEE C57.13-2006

Description

Specification

Reference voltage (Un)

3X110V/√3

Operation voltage

60% Un~140% Un

Limit of Voltage

0% Un~190% Un

Maximum switching voltage

>418V

Maximum withstand voltage

500V, 48 hours, no damages or accuracy deviation after restoration

Short-time withstand voltage

600V, 1 minute, no damages or accuracy deviation after restoration

Basic current (In)

1/5A

Maximum current (Imax)

10A

Short-circuit current

3,000A, <3ms, no damage or accuracy deviation after restoration

Frequency

50Hz ± 5%

Accuracy class

Cl.0.5S for active energy, Cl.2 for reactive energy

Starting current

0.1%In (5mA)

Pulse constant

10000imp/kWh, 10000imp/kVarh

Connection type

3P4W and 3P3W configurable by software

Consumption

Specification

Voltage circuit

<1W, 2.5VA @230V

Current circuit

<0.1VA @ Base current (Ib)

Environment

Specification

Operating Temperature

-25°C~70°C

Storage Temperature

-40°C~90°C

Humidity

average <=95%, maximum <=100%, non-condensing

Altitude

<=3000m

EMC

Specification

Electrostatic discharge (ESD)

Contact discharge: 8kV

Air discharge: 15kV, IEC 61000-4-2

Fast transient burst

4 KV/100 KHZ, IEC 61000-4-4

Immunity to HF Fields

80MHz-2GHz@10V/m with load; 80MHz-2GHz@30V/m with no load - accuracy not affected by magnetic fields from all sides -front, sides, top and bottom of the meter

Conducted disturbances by RF

150kHz - 80MHz 10V/m, IEC 61000-4-6

Radio Interference

CISPR 22, IEC 61000-4-2,3,4,6

Surge Immunity

30KA/KV , 4/10S against lightening, IEC 61000-4-5

Insulation

Specification

Impulse voltage (1.2/50μS to IEC 62052-11)

>8KV coil to contact; >4KV contact to contact

AC voltage (1MIN, 50HZ)

4KV coil to contact; 2KV contact to contact