DC Voltage Measuring Equipment(DCVT)
DC-Voltage-Measuring Equipment (DCVT) is the voltage measuring equipment
to measure the feeder voltage. The voltage between the wire and the rail is
input to the device and the converted output is obtained through the highresistance and insulation circuit in the device.
This device obtains the voltage output proportional to the input voltage andthe current output.

Previously two units required, now only
one combined unit can work
(DCPT+RP→DCVT)

Conventional productTransformer substation

DC bus barinput voltageswitchboard
DC Voltage Measuring
Equipment(DCVT)

DC transformer(DCPT)

Information
measuring device

input voltage

Voltmeter
Converter .5 1.0 1.5(DC/DC)
02.0(DCVT)kV

Telemeter

electrical wire

Magnifying glass(RP)Device fault
indication
Output voltage

converter(AC/DC)

Monitoring
deviceOutput current

rail

control power
supplyOutput is low
pressure system

Purpose and role of the device
In the past, DC transformers (DCPTs), multipliers (RPs), and converters (SBs, REBs) were used in
combination to measure the feeder voltage, but we have developed the DC feeder voltagemeasurement device (DCVT) packed in a single package to meet the needs for downsizing of DC
feeder cubicles.
In addition, the lightning resistance has been improved in order to respond to recent lightning damage
countermeasures.

Miniaturization and Light weight
Our new compact device one unit is equivalent to our conventional installation of two DC
transformers (DCPT) and two multipliers (RP). It is possible to reduce the size, weight and spacerequired. (Compared to the conventional system: 1/4 the volume and 1/4 the weight)

Improvement of electrical insulation performance
The input circuit section and output circuit section are completely isolated from each other.
The lightning impulse withstand voltage of the input terminal is secured at 30kV.
(Conventional model: 20kV)

Energy saving
Comparing the use of our conventional two-unit combination of a direct current transformer (DCPT)
and a multiplier (RP) with the new model, the power consumption has been significantly reduced.
(99% reduction compared to conventional models)

Improved responsivenessCompared with our conventional DC transformers (DCPT) and multipliers (RP), the new model canfollow steep changes and has improved input voltage reproducibility.

Monitoring the status of the supply voltage
We also have a DC line voltage detector (separate product) that can monitor the pressurized state ofthe line voltage with an output contact.

DC-Voltage-Measuring Equipment (DCVT)
Type

PTMF-2

Input voltage

DC ±2000V

Input resistor

Approx. 2 MΩ

Output current

DC ±8mA (Load: 1kΩ or less)

Output voltage

DC ±10V (Load: 10kΩ or more)
orDC ±6.67V (Load: 10kΩ or more)(Output voltage DC5V at input voltage DC1500V)

Fault indication of Device

Control power "OFF" orDisplay output (closed circuit) when the power
supply of the circuit in the device is "OFF”
Contact configuration : 1b
Contact capacity : DC125V 0.2A (Resistance load)

Accuracy±1.0% (FS, but 2000V equivalent to be FS)

Ripple noise

100mVp-p or less

Response time(Step Response)

2ms(From when input voltage 1500V is applied until
output value reaches 90%)

Control power supply

AC200/210V (-15%, +10%) 50/60Hz (±2Hz)
or
AC100/110V (-15%, +10%) 50/60Hz (±2Hz)

Dimensions/Weight

H413mm x W254mm x D152mm / Approx. 7.0kg

PTMF-2DC Voltage Detecting Equipment （VD)
TypeInput voltage

YFV-8
DC 2000V

Input resistor
Set voltage(Detection voltage)

Approx. 2 MΩDC 1000VAccuracy(Detection voltage)
Set voltage(Released voltage)

DC 1000V

DC 500V±5% or less

DC 800V

DC 400V

Accuracy(Released voltage)±10% or lessFault indication of Device

Control power "OFF" orDisplay output (closed circuit) when the power
supply of the circuit in the device is "OFF”
Contact configuration : 1b
Contact capacity : DC125V 0.2A (Resistance load)

Operating time
(Detection voltage)

50ms or less
(When inputting 0% to 120% of detectable voltage)

Operating time
(Released voltage)

50ms or less
(When inputting 120% to 0% of return voltage)

Control power supply

DC100/110V(DC80V to 130V)

Dimensions/Weight

H413mm x W254mm x D152mm / Approx. 7.0kg

YFV-8