TYPE KVTS VOLTAGE TRANSFORMER TEST SYSTEM
Functional Description and Specifications
1.
2.
General
a.
The test system shall consist of a control console and a separate
precision/loading transformer set.
b.
The test system shall be able to check the accuracy of instrument
transformers having primary ranges from 120 to 14,400 volts.
c.
The test system shall include a built-in, microprocessor-controlled,
automatic, auto-ranging comparator.
d.
The test system shall incorporate protective circuitry to ensure the safety of
the operator, the test system, and the transformer-under-test.
e.
The accuracy or calibration of the precision transformer must be traceable
to the National Institute of Standards and Technology.
f.
The test system shall be suitable for 60 Hz. operation.
Test Ranges
a.
The following primary ranges shall be provided:
120; 240; 480; 600; 2,400; 4,200; 4,800; 7,200; 8,400; 12,000; and 14,400
volts.
3.
b.
The secondary voltage shall be 120 volts.
c.
Transformers shall be able to be tested from 50% to 120% of the selected
voltage.
Test Burdens
a.
The following ANSI burdens shall be included and shall be switch
selectable:
W, X, M, Y, Z, and ZZ
b.
These burdens shall be very stable and highly accurate (the resistive and
inductive component values shall be accurate to within ±1%).
KVTS Specification
Page 1 of 3
04-2002
c.
4.
5.
Comparator
a.
The comparator shall be dedicated to the test system. It shall only be
capable of testing voltage transformers.
b.
The comparator shall be automatic and autoranging to provide minimum
measurement time. Measurements shall be completed within 5 seconds of
adjusting the test voltage.
c.
The comparator shall digitally display test voltage and test results. Test
results shall consist of ratio error (in % or RCF) and phase error (in minutes
or milliradians).
d.
The comparator shall calculate and digitally display the best accuracy class
for which the transformer-under-test qualifies.
e.
The comparator shall include protective circuitry which senses error
conditions such as wrong ratio or wrong polarity and then automatically
removes power from the test system loading circuitry.
f.
The comparator shall offer printer or RS-232 test result output options.
System Accuracy
a.
6.
The combined error of the precision voltage transformer and the transformer
comparator shall be no greater than ±0.025% on ratio and ±2 minutes on
phase angle at 100% full load voltage.
Self Check
a.
7.
Provisions shall be made for connection of an external burden.
The calibration of the precision transformer shall be able to be periodically
checked by the One-to-One method, whereby the ratio and phase angle
performance can be quickly and accurately checked without the use of an
external reference standard.
Input Power Requirements
a.
The test system shall require 120 volt, single-phase service at a nominal 10
amperes.
KVTS Specification
Page 2 of 3
04-2002
8.
9.
Weight and Dimensions
a.
The approximate weight of the test system control console shall be 350 lbs.
(159 kg.).
b.
The test system control console shall measure 61.5 in. (156 cm.) High, 24
in. (61 cm.) Wide, and 37 in. (94 cm.) Deep.
c.
The approximate weight of the precision/loading transformer set shall be
370 lbs. (168 kg.).
d.
The precision/loading transformer set shall measure approximately 40 in.
(102 cm.) High, 20 in. (51 cm.) Wide, and 15 in. (38 cm.) Deep.
Instruction Manual
a.
10.
An instruction manual shall be furnished with the test system.
Options
a.
A printer for printing test results shall be able to be purchased separately.
KVTS Specification
Page 3 of 3
04-2002