§ ABOUT TRANSDUCER §EXAMPLE of USE / OPERATIONAL METHOD SELECTION■ EXAMPLE of USE● EXAMPLE OF CENTRALIZED MONITOR SYSTEM● EXAMPLE OF DIRECT TRANSMISSION TELEMETER■ OPERATIONAL METHOD SELECTION (VOLTAGE/CURRENT TRANSDUCER)(Select an operational method in accordance with the conditions of waveform applied)
Conditions ofOperational

Error in distorted wave

waveform applied

method(raw power)

Sine wave

Rectification
methodRectification

3rd harmonics 5%

method withwaveformcompensation

3rd harmonics 15%

Mixed 3rd harmonics in by 15%:
variation of 6%* SCR : variation of 26%
Mixed 3rd harmonics in by 15%:
variation of 1.5%
* SCR : variation of 7%

RMS value

Mixed 3rd harmonics in by 15%:

rectification

variation of 0.4%

method3rd harmonics 30%

RMS value

SCR waveform

method* SCR : variation of 1%
Mixed 3rd harmonics in by 15%:
variation of 0.1%
* SCR : variation of 0.2%

Type name (example)
A: AT2-60
V: VT2-60

A: ATT2-82A, 91A
V: VTT2-82A, 91A

A: AT2-82E
V: VT2-82E
A: AETT2-82A, 91A
V: VETT2-82A, 91A

A: current transducer; V: voltage transducer* Influence of SCR waveform: the case of changing conduction angle by 90 degree at the time of maximum input.
● EXAMPLE OF INPUT WAVEFORM► (3rd harmonics content ratio) =(RMS value of 3rd harmonics)/(RMS value of fundamental harmonics)

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► In the case of SCR waveform, standard conduction
angle at maximum rating is 90 degree or more. Specify
the conduction angle if it is less than 90 degree.

§ ABOUT TRANSDUCER §CAUTIONS ON USE■ CAUTIONS● LIGHTNING SURGE

The statistical result of thunder accident whichhappened to low voltage circuit in national main
power stations according to a report on thunder
accident of low voltage controlling circuit] released by
Investigation Committee for thunder accident, IEEJ;
Period covered (1955 – 1964): 10 years
Number of power station: 1707
Record of discharge current by arrester: 7085

As for the strength of lightning surge current in low
voltage circuit, approx. 80% were equal to or lessthan 800A, as for the voltage strength, 99.9% wereequal to or less than 4.5kV (Max. 5.75kV).

► Our standard about induced lightning surge voltage/current
Voltage: impulse voltage 5kV±1.2/50µs (identical toCurrent: waveform±8/20µs, standard impulse
current 2,000A as described in JIS C1111-1989.
JEC-212 waveform) is the standard voltage between
electric circuit and earth.
● PROTECTION AGAINST INDUCED LIGHTNING SURGE (LOW VOLTAGE CIRCUIT)
Following is about the effect of electrostatic shield between primary and secondary winding
Generally, primary and secondary winding of a small size transformer inside an AC transducer are insulated. If
there is a primary and a secondary winding shield between primary and secondary winding, it brings about thefollowing effect.
Effect of electrostatic shield between primary and secondary winding (example)
Voltage between

Damping ratiooutput side and earth V2

V2/V1

5kV ± 1.2/50µs

Peak voltage 350V

1/14

5kV ± 1.2/50µs

Peak voltage 3800V

1/1.3Condition

Impulse voltage V1

W/ electrostatic shieldW/o electrostatic shield

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§ ABOUT TRANSDUCER §CAUTIONS ON USE► Protection when an induced lightning surge occurred on input side of an AC transducer.

If there is the possibility
for an induced lightning
surge occurring on inputof an AC transducer,
take measures as thefigure in the left shows.

Each type of AC transducer has impulse voltage 5kV ± 1.2/50µs against earth.
► Protection when an induced lightning surge occurred on output side of an AC transducer.

An AC transducer, a sensor transducer or a signal transducer with output line surge protection does not need aprotector at transducer output side. Constant current output type which is normal mode noise resistant, such
type is the choice in the case of transmitting an output to a distant place.
● TYPE OF OUTPUT WIRING
When wiring, separate the output line of transducer as much as possible from an electric power line which can bea noise source, or lines with steep and sharp voltage/current fluctuation.
► General output wiring
Twisted pair line is recommended for general
output wiring. Twisted pair line sustains a highbalancing against electrostatic induced noise byvoltage or electromagnetic induced noise bycurrent, this makes it hard for common modenoise to convert into normal mode, and cansuppress the occurrence of normal mode noise.
► Effect of using twisted pair line with shield
Twisted pair line with shield is recommended in the case of a particularly big noise.

Please ground either one oftransducer side and instrument
side of the shield.

Electrostatic induced noise (common-mode noise) which is caused by voltage can be reduced by electrostaticshield.

Products List§ ABOUT TRANSDUCER §CAUTIONS ON USE► Reduction of electromagnetic-induced noise
In the case of a particularly big electro-magnetic induced noise, shielding noise source or the output linewith an iron tube is recommended. When shielding the heavy-current cable of noise source withferro-magnetic material, electromagnetic induced noise by current can be reduced. Also, there comes about
the effect of electrostatic shield if the shield is connected to ground.

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§ ABOUT TRANSDUCER §INPUT - OUTPUT RELATIONSHIP■ INPUT - OUTPUT RELATIONSHIP (AC TRANSDUCER)● CURRENT / VOLTAGE
► A-1

► A-2
Input

Output5A

5V or 1mA

150V
80 ― 120V

0 ― 5V or 0 ― 1mA

Input

Output0 ― 5A

4 ― 20mA or

0 ― 150V

1 ― 5V80 ― 120V● AC POWER / REACTIVE POWER► A-3► A-4Input

OutputInput

Output±1kW±5V or ±1mA

-1kW ― +1kW

0 ― 5V or

LEAD1kvar-5 ― +5V or -1 ― +1mA

LEAD1kvar

0 ― 1mA― LAG1kvar― LAG1kvar● AC POWER / REACTIVE POWER● V-V / V-I PHASE ANGLE

► A-5

► A-6
Input

OutputInput

Output0 ― 1kW

4 ― 20mA or

LEAD90° ― LAG90°-5 ― +5V or-1kW ― +1kW

1 ― 5VLEAD60° ― LAG60°-1 ― +1mA

LEAD1kvar ― LAG1kvar

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LEAD45° ― LAG45°

§ ABOUT TRANSDUCER §INPUT - OUTPUT RELATIONSHIP► A-7► A-8Input

OutputInput

OutputLEAD90° ― LAG90°

0 ― +5V or

LEAD90° ― LAG90°

4 ― 20mA or

LEAD60° ― LAG60°

0 ― +1mA

LEAD60° ― LAG60°

1 ― 5VLEAD45° ― LAG45°

LEAD45° ― LAG45°● POWER FACTOR► A-9 Output pattern 1► A-10 Output pattern 1Input

OutputInput

OutputLEAD0 ― 1 ― LAG0-5 ― 0 ― +5V or

LEAD0 ― 1 ― LAG00 ― 2.5 ― 5V or

LEAD0.5 ― 1 ― LAG0.5-1 ― 0 ― +1mA

LEAD0.5 ― 1 ― LAG0.5

0 ― 0.5 ― 1mA► A-11 Output pattern 1► A-12 Output pattern 3

Input

OutputLEAD0 ― 1 ― LAG0

4―12―20mA

LEAD0.5 ― 1 ― LAG0.5

or 1―3―5V

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Input
LEAD0 ― 1/1 ― LAG0

Output0 ― -1/+1 ― 0V
0 ― -1/+1 ― 0mA

§ ABOUT TRANSDUCER §INPUT - OUTPUT RELATIONSHIP● FREQUENCY► A-13► A-14Input

OutputInput

Output45 ― 55Hz

0 ― 5V or

45 ― 55Hz

4 ― 20mA or55 ― 65Hz

0 ― 1mA

55 ― 65Hz

1 ― 5V

Input

Output45 ― 55Hz-5 ― +5V or

55 ― 65Hz-1 ― +1mA► A-15

Products List§ ABOUT TRANSDUCER §INPUT - OUTPUT RELATIONSHIP■ INPUT - OUTPUT RELATIONSHIP (AC SPECIAL POWER FLOW TRANSDUCER)● POWER FLOW
► A-16 Two quadrant
Input

Output±5A

4―20mA
1―5V● POWER FLOW REACTIVE POWER► A-17 Two quadrant► A-18 Four quadrant

Input

OutputInput

OutputLEAD1kvar―

4―20mA

LEAD1kvar―

4―12/12―20mA

LAG1kvar

1―5V

LAG1kvar1―3/3―5V► A-19 Four quadrant► A-20 Four quadrant

Input

OutputInput

OutputLEAD1kvar―

20―4/4―20mA

LEAD1kvar―

4―20/20―4mA

LAG1kvar

5―1/1―5V

LAG1kvar

1―5/5―1V

Products List§ ABOUT TRANSDUCER §INPUT - OUTPUT RELATIONSHIP● POWER FLOW POWER FACTOR► A-21 Two quadrant► A-22 Four quadrant

Input

OutputInput

OutputLEAD0―1―LAG0

4―20mA

LEAD0―LAG0

4―12/12―20mA

LEAD0.5―1―LAG0.5

1―5V

LEAD0.5―LAG0.5

1―3/3―5V► A-23 Four quadrant► A-24 Four quadrant

Input

OutputInput

OutputLEAD0―LAG020―4/4―20mA

LEAD0―LAG04―20/20―4mA

LEAD0.5―LAG0.5

5―1/1―5V

LEAD0.5―LAG0.5

1―5/5―1V

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