Huazheng HZCT-100B User manual

HZCT-100B
CT PT Analyzer
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear Customers,
Thank you for purchasing our HZCT-100B CT PT Analyzer. Before you use the
product for the first time, please carefully read this Manual which can help you skillfully
use the Tester.
Our aim is to improve our products continuously, so that the
product you use may be a little bit different from the Manual. In
case of any changes, we will inform you in the attached sheets!
Thanks for your understanding. If anything is unclear, please
contact the After-Sale Service Department in our company, and
we will certainly meet your requirements.
Since the I/O terminal, testing column and etc. may carry
voltage, electric spark may be produced when you insert and
unplug the test lead, power socket and etc.. Please do be
careful of electric shock and avoid hazards. Pay attention to
your personal safety!

Prudent Warranty
For the products manufactured by our Company, if the defects appear within 3
months from the date of delivery, we can provide the replacement; if the defects appear
within one year from the data of delivery, we can provide free services and repairs; if the
defects appear more than one year after delivery, we can provide life-long paid
maintenance services.
Safety Requirements
Please carefully read the following safety precautions so as to avoid personal injury
and prevent the product or any other products connected thereto from being damaged. In
order to avoid the possible dangers, the product can only operate within a specified range.
Only the qualified technicians can implement the maintenance.
— Prevent Fire or Personal Injury
Use appropriate power cables. Only the dedicated power cables which conform to the
specifications of the product can be used.
Correct connection and disconnection. When the test lead is connected to the
charged terminal, please don’t connect or disconnect the test lead at will.
Earth the product. In addition to be earthed using the power line, the earthing rod on
the shell of this product must also be earthed. In order to prevent electric shock, the
earthing conductor must be connected to the ground. Before the connection to the input or
output terminal of the product, please make sure that the product has been properly
earthed.
Pay attention to the rated values of all terminals. In order to prevent fire or electric
shock, please pay attention to all the rated values and marks of the product. Before the
connection, please read this Manual so as to gain more insight into the information on
rated values.
Never operate the product without an instrument cover. If the cover or panel has
been removed, never operate the product.
Use appropriate fuses. Use the fuses of the type and rated value specified for the
product.

Avoid touching the exposed circuits or charged metal. When the product is
electrified, never touch the exposed contacts or parts.

In case of suspected failure, never operate the product. If you suspect the product
is damaged, please contact the maintenance personnel for examination and never
operate the product.
Never operate the product in a humid environment.
Never operate the product in an explosive environment.
Keep the surface of the product clean and dry.
－Safety Terminology
Warning: Warning messages indicate the conditions or
practices that may cause loss of life or personal injury.
Caution: Caution messages indicate the conditions or practices
that may cause the damages to the product or other properties.

Contents
I.Instrument Characteristics And Parameters..............................................................................1
1.1 Characteristics........................................................................................................................2
1.2 Panel........................................................................................................................................2
1.3 Technical Parameter..............................................................................................................2
II.User Interface And Method Of Operation................................................................................. 3
2.1 Current Transformer..............................................................................................................3
2.2 Voltage Transformer............................................................................................................11
2.3 Self-test Page.......................................................................................................................14
2.5 Button Function....................................................................................................................15
III.Appendix..................................................................................................................................... 17
A. Principle Of Low-frequency Test.........................................................................................17
B. 10% Error Curve....................................................................................................................18
C. Actual Connection Method.................................................................................................. 20
D. Four-terminal Method Of Measuring Principle Wiring.................................................... 23
IV.Packing List................................................................................................................................ 25

1
I.Instrument Characteristics And Parameters
HZCT-100B CT PT Analyzer is new product created after widely adopt customers’
advices and deep theoretical study. It is based on the automatic FA Series Transformer
Tester General which is produced by our company that is widely acclaimed and applied.
The adoption of high-performance DSP and ARM, advanced manufacturing technology
ensure a stable and reliable product performance, full-featured, high degree of automation,
high efficiency, in the domestic leading level, they are the professional testing equipments
for transformer check in power industry.
1.1 Characteristics
★Full-featured, not only satisfy the test requirements of various CTs (include TP
class), such as the excitation characteristics (i.e., volt-ampere characteristics),
ratio, polarity, secondary winding resistance, secondary burden, ratio error and
phase displacement, but can also be used for the tests of various PTs, including
excitation characteristics of the electromagnetic unit, ratio, polarity, secondary
winding resistance, ratio error and phase displacement.
★Automatically give CT, VT parameters, including knee point voltage / current, 10%
error curve, the accuracy limit factor (ALF), instrument security factor (FS), the
second time constant (Ts), remanence coefficient (Kr), saturated and unsaturated
inductance etc.
★Test meet IEC60044 GB1208 (-1) GB16847 (IEC60044-6) became etc all kinds of
transformer standards, and in accordance with the transformer types and levels of
automatic choose which standard test
★Based on advanced principle of low-frequency test method that can meet the CT
test on knee voltage up to 60KV.
★Friendly interface beautiful, all English graphic interface
★The instrument can store 1000 groups of test data that won’t be lost when power
off. After test ended, the data can be coped to PC by USB disk for analysis and
being transformed into WORD report.
★Test is simple and convenient; one-click can complete tests of CT secondary

2
resistance, excitation, ratio and polarity.
★Easy to carry, because the weight is less than 10Kg.
1.2 Panel
The instrument panel structure is as shown in right figure.
• Yellow K1, black K2 terminal: test power output
• Green S1, black S2 terminal: measure output voltage
• Red P1, black P2 terminal: measure inductive voltage
• Keyboard: Enter the value and operational command
• LCD screen: GUI
1.3 Technical Parameter
HZCT-100B
Usage
CT，PT
Output
0~180Vrms，12Arms，36A（peak value）
Voltage measurement accuracy
±0.1%
CT Ratio
Range
1~40000
accuracy
±0.05%
PT Ratio
Range
1~40000
accuracy
±0.05%
Phase
Range
±2min
accuracy
0.5min

3
DC resistance
Range
0~300Ω
accuracy
0.2%±2mΩ
Burden
Range
0~1000VA
accuracy
0.2%±0.02VA
Power supply
AC220V±10%，50Hz
Environmental Conditions
Operating temperature : -10οC~50οC，
Humidity :≤90%
Weight and Dimensions
Dimensions: 365 mm×290
mm×153mm,Weight<10kg
II.User Interface And Method Of Operation
2.1 Current Transformer
In Para interface, use the Rotating mouse to switch cursor in transformer type frame, and
then choose the current transformer (CT).
2.1.1 Test Connection
Used for selecting one or more experiment item, including four options such as
resistance, excitation, ratio, burden etc. According to transformer type, four options can be
combinated as shown in below table.
Table 2.1 CT experiment project description
experiment item
Description
Connection
diagram
resistance
excitation
ratio
error
limit
burden
√
Measure CT’s
secondary winding
resistance
Fig 2.1,can
disconnection if
measuring
primary
winding.
√
√
Measure CT’s
secondary winding
resistance and
excitation
characteristic
Fig 2.1,can
disconnection if
measuring
primary
winding.
√
√
√
Measure CT’s
secondary winding
resistance, check
it’s ratio and
polarity
Fig 2.1

4
√
√
√
√
√
Measure CT’s
secondary winding
resistance and
excitation
characteristic,
check it’s ratio and
polarity
Fig 2.1
√
Measure CT’s
secondary burden
Fig 2.2
Note：The ‘√’ means valid, and the blank means invalid
Step:
Step1. According to the CT testing project description of the table 2.1 to wiring (For all
the CT structures, please refer to the description of appendix D for the actual connection
mode)
Step 2. The other windings of the same CT should be opened; CT’s primary side to
grounding, equipment should be also to ground
Step 3. Power on and prepare parameters Settings.
Step 4. Then switch cursor to the “start” button to start
Fig 2.1 DC resistance, excitation, ratio Fig 2.2 Secondary load experiment connection
experiment connection

5
2.1.2 Expansion Parameters
Fig 2.3 Basic parameter Settings interface
parameter Settings:
Switch cursor to where the parameter you want to set by turning the Rotating mouse
1. Serial number and resistance number: Input letters and numbers, the filename default
saved is “CT_ numbers _ winding number.ctp”
2. Rated secondary current
sn
I
: The current transformer’s secondary rated current is 1A or
5A generally.
3. Class: For CT, there’re 8 options for Measured winding class, they are P, TPY, metering,
PR, PX, TPS, TPX and TPZ etc.
4. Current temperature: When measure the temperature of winding, generally input the
current room temperature for reference.
5. Rated frequency: 50Hz or 60Hz
6. Maximum measured current: Can be generally set to rated secondary current value.
For TPY class, can be generally set to 2 times rated secondary current value. For P class,
assumed 5P40, rated secondary current is 5A, so the maximum should be set to
10%*15*5A=7.5A
If user want to measure the bellowing items, user need to set the basic parameters
accurately (Suggest user setting himself)
1. Turn ratio error, ratio error and phase error
2. Accurately calculate the limit e.m. f and their corresponding compound error

6
3. Measured accurately limit coefficient, Instrument security coefficient and symmetrical
short-circuit current multiples
4. The measured transient dimensioning coefficient, peak transient error and second time
constant
For different CT, different parameters should be set. Details as table 2.2
Table 2.2 CT parameter description
parameters
description
R-IEC
R-ANSI
TPY
M-IEC
M-AN
SI
PR
PX
TPS
TPX
TPZ
rated primary
current
Used to calculate
the ratio of actual
current accurately
√
√
√
√
√
√
√
√
rated burden
Rated load of
plate, power factor
for 0.8 or 1
√
√
√
√
√
√
√
√
power factor
√
√
√
√
√
√
√
√
Rated
accurate limit
coefficient
alf
K
The provisions of
the plate, default
10,used to
calculate the limit
e.m.f. and their
corresponding
composite error
√
Rated
symmetric
short-circuit
current
coefficient
ssc
K
The provisions of
the plate, default
10,used to
calculate the peak
and their
corresponding
limits e.m.f
transient error
√
√
√
√
Primary time
constant
default :100ms
√
√
√
Second time
constant
default :3000ms
√
√
Duty cycle
C-t1-O or
C-t1-O-tfr-C-t2-O，
default:C-t1-O
cycle
√
√

7
t1
Current time limit
for the first
time,default:100m
s
√
√
tal1
Time required to
reach the specified
accuracy during
the first
magnetization
cycle,default:40ms
tfr
Time required to
reach the specified
accuracy during
the second
magnetization
cycle,default:500m
s,Choose
C-t1-O-tfr-C-t2-O,
Cycle will be
shown
√
√
t2
Current time limit
for the second
time,default:100m
s.Choose
C-t1-O-tfr-C-t2-O,
Cycle will be
shown
√
√
√
tal2
Second the flow by
maintaining
accurate limits of
time,default:40ms
√
√
choose
C-t1-O-tfr-C-t2-O,c
ycle will be shown
Rated
instrument
security
coefficient
FS
Nameplate
regulation,default:
10
√
Used for
calculation of the
limit of composite
error and their
corresponding
electromotive
force

8
Rated
calculating
coefficients
√
Rated
inflection
point
potential(Ek)
√
Ie
correspondin
g with Ek
√
dimensionin
g factor
√
Rated Ual
The rated
equivalent
quadratic limit
voltage
√
Ial
correspondin
g with Ual
√
Note: "√" expressed the need for settings that do not need to set up a blank.
2.1.3 Test Results
The test result interface as shown in fig 2.4
Fig 2.4 The test result interface
For different classes of CT and measured items,the test result will be different too,details
as table 2.3:
Table 2.3 CT test results description

9
result
description
P
TP
Y
M
PR
PX
TPS
TPX
TPZ
Load
Actual load
unit：VA，CT secondary
measure actual load
√
√
√
√
√
√
√
√
Power factor
Power factor of actual
load
√
√
√
√
√
√
√
√
impedance
unit：Ω，CT secondary
measure secondary
impedance
√
√
√
√
√
√
√
√
Resistance
resistance
（25℃）
unit：Ω，CT secondary
measure secondary
resistance
√
√
√
√
√
√
√
√
resistance
（75℃）
ref
R
，unit：Ω，Convert
to resistance under
75℃
√
√
√
√
√
√
√
√
excitation
knee voltage
and knee
current
unit:V and A，
According to standard
definition，when knee
voltage increase
10%,knee current
increase 50%.
√
√
√
√
√
√
√
√
Unsaturated
inductance
u
L
unit:H,The average
inductance of linear
section for excitation
curve
√
√
√
√
√
√
√
√
remanence
coefficient
r
K
ratio of magnetism and
magnetic
√
√
√
√
√
√
√
√
Second time
constant
s
T
unit：s,the time
constant of CT's
second connect rated
burden
√
√
√
√
√
√
√
√
limiting e.m.f
al
E
unit:V,calculation limit
e.m.f. according to the
CT nameplate and
resistance under 75℃
√
√
√
√
√
√
composite
error
al
E
limiting e.m.f or the
composite error of
rated knee potential
√
√
√
√

10
Peak
transient
error

Peak transient error of
limiting e.m.f
√
√
√
ALF
actual ALF
√
√
Instrument
security
coefficient
actual instrument
security coefficient
√
Symmetrical
short-circuit
current
multiples
Kssc
actual symmetrical
short-circuit current
multiples
√
√
√
√
transient
dimensionin
g factor
actual transient
dimensioning factor
√
√
√
calcuated
coefficient
Kx
actual calcuated
coefficient
√
Rated knee
potential Ek
√
Ie
correspondin
g with Ek
The actual excitation
current corresponding
with rated knee
potential
√
Rated
voltage Ual
The rated equivalent
second limit voltage
√
Ial
correspondin
g with Ual
The actual excitation
current corresponding
with the rated
equivalent second limit
voltage
√
Ratio
Ratio
Actual current ratio
under rated burden
√
√
√
√
√
√
√
√
Turns ratio
The ratio of actual
secondary winding
and primary winding
√
√
√
√
√
√
√
√
Ratio
difference
The current errors
under rated load
√
√
√
√
√
√
√
√
Phase
difference
The D-value of phase
under rated load
√
√
√
√
√
√
√
√

11
Polarity
There're two polarity
relationship for
primary CT and
secondary CT:
Positive and Negative
√
√
√
√
√
√
√
√
Turn ratio
error
The relative error
between measured
trun ratio and rated
turn ratio
√
√
Note: "√" expressed the need for settings that do not need to set up a blank
2.2 Voltage Transformer
2.2.1 Test Connection
Used for selecting one or more experiment item, including three options such as
resistance, excitation, ratio etc. According to transformer type,three options can be
combinated as shown in table 2.4.
Table 2.4. PT experiment project description
experiment item
Description
Connection diagram
resistanc
e
excitatio
n
ratio
burden
√
Measure PT’s secondary
winding resistance
Fig 2.5, must
disconnection if
measuring primary
winding.
√
√
Measure PT’s secondary
winding resistance and
excitation characteristic
Fig 2.5,must
disconnection if
measuring primary
winding.
√
Check it’s ratio and
polarity
Fig 2.6
√
Measure PT’s secondary
burden
In Para interface, use the Rotating mouse to switch cursor in transformer type frame, then
choose PT.
Experimental wiring procedure is as follows:
Step 1. According to PT testing program description of list 2.4, refer to figure 2.5 or figure
2.6for wiring
Step 2. The other windings of the same CT should be opened

12
Step 3. Power on and prepare parameters Settings.
Step 4.Then switch cursor to the “start” button to start
Fig 2.5 PT’s DC resistance and excitation Fig 2.6 PT’s ratio and excitation
2.2.2 Expansion Parameters
Fig 2.7 PT parameter establish interface
parameter Settings:
Switch cursor to where the parameter you want to set by turning the Rotating mouse
1. Serial number and resistance number: Input letters and numbers directly
2. Rated secondary voltage
sn
V
: Secondary rated voltage of Voltage transformer
3. Class:For CT,there’re 2 options for Measured winding class, they are P and metering
etc.
4. Current temperature:When measure the temperature of winding, generally input the

13
current room temperature for reference.
5. Rated frequency: 50Hz or 60Hz
6. Maximum test voltage: The equivalent voltage under the maximum frequency of output
while testing
7. Maximum test current: The maximum AC current of output while testing
2.2.3 Test Results
Test results interface as shown in Fig 2.8
Fig 2.8 PT’s test results interface
According to different voltage transformer type and experiment item, the results will
be also different. The detailed as shown in Table 2.5.
Table 2.5 PT test results description
result
description
P
M
Resistanc
e
resistance（25℃）
R
unit：Ω，resistance value under current
temperature.
√
√
resistance（75℃）
ref
R
unit：Ω,Resistance value under reference
temperature(the temperature is variable).
√
√
excitation
knee voltage and
knee current
unit:V and A，According to standard
definition，when knee voltage increase
10%,knee current increase 50%.
√
√
Ratio
Ratio
Actual current ratio under rated burden
√
√
Turns ratio
The ratio of actual secondary winding and
primary winding.
√
√

14
Ratio difference
The current errors under rated load.
√
√
Phase difference
The D-value of phase under rated load.
√
√
Polarity
There're two polarity relationship for primary
and secondary , Positive and Negative .
√
√
2.3 Self-test Page
Fig 2.9 Self-test interface
2.4.1 Parameter Setting
The required self-test parameters are shown in the table 2.7:
Table 2.7 Self-test parameters
Parameter
description
Test current
The need for device output current, valid value range: 1mA ~ 5A
Test voltage
The need for device output voltage, valid value range: 1V~100V
est. frequency
Installation of the output voltage or current frequency, scope: 0 ~ 50Hz
After testing Current test set or test voltage, set the test frequency, the frequency of the
device will output the corresponding voltage or current, to detect and display the actual
voltage or current. In the choice of voltage, if the burden is too small, resulting in greater
than the actual current RMS 5A, show that information overburden. In the selection of
current, if the burden too much, leading to the actual test voltage RMS is greater than
100V, it will display information overburden.
2.4.2Connection
When Choosing voltage tests, the two terminals will be short-K1 Then, K2 shorted the
two terminals. Use multimeter to get the voltage value between S1 and S2, if the value is