P.T.TESTING UNIT

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P.T.Testing unit

Description :

It compares & reads the error due to imbalance in signals of test P.T. with reference P.T. and applies necessary proportional signal to nullify the error. Input is displayed in percentage or actual value, and phase error in centiradians or minutes.

On separate key commands the error readings with date, time,% input & burden are sent either to a PC through RS232C port or to a printer connected to parallel port, in order to have report in “view format”. The data read from RS232C port can be arranged by using any standard text editor, and a printout can be taken.

Features :

  • Micro processor controlled
  • Self zero check and calibration check
  • Digital display of %input, ratio error and phase error.
  • Programmable voltage input
  • Manual and auto ranging modes
  • RS 232C port and parallel port for printing
  • Built in real time clock
  • Parameter entry through keyboard

Electrical Specifications :

Type : Single Phase
Operating Voltage : 3 To 110V AC, 0.5VA
Auxillary Supply : 11Ov / 240V. AC ±20%, 50 / 60Hz, 60VA.
Accuracy : ±0.5% Of rdg ±1 %Of Range
Frequency : 45Hz To 55Hz Or 55Hz To 65Hz
Error Ranges : 20% (±19.99% Ratio Error And (±19.99Cr* Or 680 Mins.Phase Error))
2%(±1.999% And (±1.999Cr Or 68.0 Mins.))
0.2%(±1999Ppm And (±1999µR Or 6.80 Mins.))
(Cr = Centiradians, µR = Microradians, Ppm = Parts Per Million).
Resolution : 0.1 Vac
Measuring Time : 7 Seconds, Irrespective Of Signal Level And Error Range.
Outputs : RS232C Port & Parallel Port (Data In ASCII Format).
Insulation Resistance : Greater Than 20 Mohms At 500V. DC.
Dielectric Strength : 2KV RMS For 1 Minute
Operating Temp : 0°C To 55°C
Storage Temp : - 20°C To 70°C
Humidity : Upto 95% RH

Mechanical Specifications :

Model : PTU
Size : 180 X 320 X 450 mm
Weight(Appro.) : 8.0 Kg.

Keyboard Controls :

0 - 9 : Numeric keys to enter values.
. : Decimal point.
ENT : Enter key. And also to enter voltage input.
RTC : Enter date and time.
SR / VA : Enter serial no. and burden.
PRINT : Take printout of error readings
SER : Send data to serial port.
% / ACT : Display input in percentage or actual value
DEG / RAD : Display phase error in minutes or centiradians.
ZERO : Check auto zero.
CAL : Test self calibration.

Displays and Indications :

  • 4Digit LED display to indicate input voltage, ratio error and phase error.
  • LED indications for following quantities.
  • % Input
  • Minutes and centiradians.
  • Range for 20%, 2%, 0.2% and Auto
  • Balance, overrange, zero and callibration.

Printing :

Date, time, serial no., input(% or actual value), burden, % ratio error, & phase error (minutes or centiradians).

Ordering Information :

1) Type 2) Model 3) Operating voltage 4) Operating frequency.