Huazheng HZ-4000T2 User manual

HZ-4000T2
Cable fault location system
Operation Manual

Please read the instructions carefully before using !!!
★Operator must possess professional operation qualifications for
high-voltage equipment
★Strictly follow the national high-voltage equipment operating
specifications
★This instrument has a high-voltage characteristics, please pay
attention to personal and equipment safety
★Make sure that the ground is good and the wiring is correct
★Unload the residual voltage by following this instruction after
using

HZ-4000T2 Cable Fault Location System
Introduction
I. Introduction
1 It is a one body trolley structure, easy handling at site.
2 You can do site test without complex wiring, because all test modes and switching
voltage levels are automatically switched by weak control internal high-voltage
switches.
3 It can quickly locate and point low resistance, high impedance fault leakage,
flashover faults in power cable with a variety of 220V-220KV voltage level.
II.Characteristics
1 It integrates multi-gear DC high-voltage generator, multi-gear high-voltage
capacitor, arc-stabling units and a variety of signal acquisition in one body, which
facilitates fault location operation.
2 Switching between three gear test modes, two gear voltage levels is controlled by
low-voltage weak electricity.
3 World's leading test method makes difficult fault detecting become very simple.
4 The requirement to operators’ level for technical equipment is low.
5 The DC voltage is up to 32kV.
6 Each stall of voltages, which is 16 / 32kV, can output up to 1536 J impact energy. It
has longer ranging delay arc time and makes a loud voice on the fault point when
locating.
7 It can do high impedance fault detection directly without burning.
6 Large wheels ensure a smooth, easy handling and site work.

III. Technical Indicators
1 Test methods: Arc reflection method, current sampling, and DC output.
2 Types of sampling signals: Arc reflection method, current sampling, and
low-voltage pulse.
3 DC voltage output:
0 ~ 32kV Negative Maximum output current: 76mA
0 ~ 16kV Negative Maximum output current: 152mA
4 Impact capacitor:
0 ~ 32kV 3μF Maximum output energy: 1536 joules
0 ~ 16kV 12μF Maximum output energy: 1536 joules
5 Ball-gap discharge: Weak electricity control. Discharge cycle can be adjusted within
3-12 seconds. It has a specially designed silencer, which meets the requirement of
silence when fault happened to the initial end cable.
6 Protection:
Zero voltage position protection: To prevent misuse, and to protect the safety of
personal and the test product;
Press "off" button, and it will release the remaining charge automatically through
safety instrument inside to ensure safety.
7 It is equipped with extension cable tray, which can be composed of automotive
cable fault location system.

HZ-4000T2 Cable Fault Location System Operation
Guide
I. External wiring
1 Perform test wiring as figure below:
From left to right: 输入：Input 电缆故障定位系统：Cable Fault Location System
高压输出电缆：High-voltage output cable 保护地：Ground of protection
红夹子： Red clip 黑夹子： Black clip
系统地： Ground of system 故障电缆： Fault cable
2 The following figure is wrong test wiring:
From left to right: 输入：Input 电缆故障定位系统：Cable Fault Location System
高压输出电缆： High-voltage output cable 错误连接：Wrong wiring
红夹子： Red clip 黑夹子： Black clip
系统地： Ground of system 故障电缆： Fault cable

II. Panel Figure
In the drawing:
1. total switch
2. Adjusting the ignition time
3. Selecting test voltage
4. Selecting Test Mode
5. Start, ignition, stop key
6. Regulator knob
7. Output voltage indicator
8. Output current indicator

9. Signal terminals
III. Operation Steps
1. Correctly connect "Cable Fault Location System" and ground, faulty cable, AC
220V power line according to the external wiring diagram. It can also be connected
via extension cable drum if equipped with one.
2. If you are preparing to locate the cable fault, connect the signal test line on "Cable
Fault Location System" control panel with corresponding signal port on the pulse
reflect meter (TDR). Best use its own battery for TDR.
3. Turn on the power switch; the instrument will do self-test for about 15 seconds.
You can carry out subsequent operations if the self-test is passed. The buzzer will
prompt you by long and short syllable if the self-test isn’t passed.
4. Adjust the ignition time knob and test voltage gear button, and test mode gear
button (if the test instrument is in high-voltage charged state or start state, the test
voltage, test mode adjustment operation is invalid).
Ignition time: High-voltage ball-gap ignition intervals on impact, usually
adjusted for 4-12 seconds.
Each test voltage gear selection: The lower voltage gear you select, the greater
the impulse condenser capacity is, and the greater the impact energy the fault cable
get at the same voltage when you are sure that the cable is already breakdown, which
is conducive to fault location, location.
The meaning of each test method is as following:
A. Multiple pulses (stable arc): When doing cable high impedance fault distance test,
contrast the waveform of not breakdown and breakdown on same-phase fault on one
screen.
B. Current sampling: When doing cable high impedance fault distance test, it

captures the current signal waveform reflected back and forth in the cable when
impact.
C. Location: Cable fault pinpoint use.
D. DC output: It can output DC high-voltage to test cable.
5. Confirm that regulator knob is at zero and stop key is in non-locked state. Press the
start key to start the instrument, and you can hear "plump" sound inside the
instrument, which means that the high-voltage output of the instrument is connected.
6. Press the ignition button (except DC output mode), and the instrument will perform
arcing ball-gap pulling in according to the set time. You can hear the ball-gap
regularly pulling in sound.
7. Adjust regulator knob up to the required voltage (The boost can be slightly low, and
gradually increased, but do not set voltage exceeding the voltage gear when it’s the
first connection).
8. The operator pulse reflect meter (TDR) will test input signals and read fault
distance if it’s cable fault location mode.
9. When the test is completed, the regulator knob should be back to zero, and press
stop key to stop and it will automatically discharge. If an emergency situation
happened, you can press stop key to stop directly and it’ll automatically discharge.
10. If you need to adjust high-voltage test, repeat steps 4-9. If you want to stop the test,
turn off the power switch.
11. Artificial discharge, confirms discharged completely, and then remove all the
wiring.
IV. Warning and Note
1. Do not set voltage over the voltage gear when boosting.
2. Do not strongly pull and fold the output high-voltage silicone cable, power line,

and ground to hard curves. Heavy things, such as automotive, rolling on it is
prohibited.
3. Do not use the instrument in an inclined state. If you have to use it in sloping
ground, please pad something to horizon level.
4. Do not allow the instrument stopped using more than 20 minutes. Turn off the
power switch if you do not use it in a long-term.
V. HZ-4000T2 Cable Fault Location System Physical List
1 HZ-4000T2 cable fault location system host
2 High-voltage cable 8 meters
3 Ground line 8 meters
4 Power line 1
5 Extended high-voltage cable tray (optional)
6 Extended power line cable tray (optional)
7 Extended ground line cable tray (optional)

HZ-400T2 Cable Fault Tester Introduction
HZ-4000T2 cable fault tester is a new type power cable test equipment designed
by our company based on the current low level of China's electric power system
management, lagging of test methods. The instrument uses advanced microcomputer
technology, which makes power cable test as a whole, so that user has advanced test
equipment and advanced test techniques, and can pass test waveform to a computer if
he has a set of the instrument. The instrument is used as a powerful cable file
management tool.
I. Main Features
Fault test of power cable has been a headache for power system. Using cable fault
test capabilities provided by this system will make it very simple. In line with the
different nature of power cable fault, the system can perform test in a variety of test
methods(such as multiple pulse, high-voltage impulse flash, high-voltage direct flash,
voltage sampling, current sampling, low pulse, etc.), and therefore it can perform
reliable tests to high resistance fault, low resistance fault, flashover fault and leak
fault in power cable.
II. Product Characteristics
● Test mode: A variety of test methods such as multiple pulse/arc reflection method,
voltage sampling, current sampling, low-voltage pulse can be implemented to meet
convenience and usage habits of users on maximum to test.

● Sample frequency: 30M, 60M, 120M multiple sampling frequency, higher test
accuracy.
● Test distance: up to 165Km.
● Test Pulse: 0.2 ~ 9.9μs, adjustable.
● Error:
Rough measurement relative error: less than ± 0.25%;
Rough measurement absolute error: below 2 km cable length is less than one
meter; 5 km or more cable length no more than 2 meters.
Error-free after location.
● Shortest measuring distance (blind) ≤2V/f(m)
V: Speed of wave propagation in cable;
f: Actual sampling frequency.
III. Technical Indicators
● Reading resolution: V/2f(m), resolution of less than 0.5 m.
● Preset four kinds of cable wave propagation speed in the instrument.
● Four sets of waveform processing makes it easier to identify waveform, and test
faster and more accurate.
● Search for the point of fault automatically by using double cursors and
automatically display distance from point of fault.
● 8.4-inch touch screen makes display more intuitive, and operation more convenient.
● Anti-power-down waveform memory 64.
● Configuring thermal mini printer makes printing test reports higher accuracy.
● It can upload waveform via COM / USB interface with a computer, which is easy to
manage.
● It comes with batteries, easy to use on site.

● Small size, light weight, imported waterproof chassis, adapt to all kinds of harsh
environment.
● Equipped with enhanced hardware waveform processing circuit compared with
DMS-3500.
HZ-4000T2 Cable Fault Tester Operation
I. Panel Structure Introduction
Panel layout schematic diagram as above, functions as following:
①Q output terminal
②Q input terminal
③Communication interface connection with the host computer
④AC power connector
⑤Power switch

⑥Waveform amplitude adjustment knob when sampling
⑦Printer
II. External Wiring
1. Wiring of low-voltage pulse method:
The dedicated signal cable:
Connect "Q output terminal" and "Q input terminal" on one side;
Connect the red clip with cable core wire, and the black clip with cable shield
ground or another phase on the other side.
2. Wiring of high-voltage method:
Connect signal test line on "Cable Fault Location System" control panel and pulse
reflect meter (TDR) corresponding to the signal port. Enter the corresponding input
and output.
Better use its own battery for "HZ-4000 Cable Fault Tester" When performing
high-voltage method test.

III. Main Display Interface Introduction
Right: 采样方式：Sampling mode 采样频率: Sampling frequency
电波速度:Electrical wave 滤波方式: Filter mode
移动选择 Moves selection
Bottom: 设置:Settings 起点: Start Point
采样: Sampling 工作电压:Working voltage
The main display interface is shown, including various parameters and sampling
waveform, each part as follows:
①Starting point (green) and end point (red) of the whole picture waveform display
area indicates waveform interval that has been selected.
②The whole picture waveform display area indicates the whole situation of the
sampling waveform. Compression ratio can be set from 1 to 114. It can show all
pictures when compression ratio is 114.
③Compression ratio of the whole picture waveform display area K1.

④Compression ratio of main display area K2.
⑤Distance from start point to fault point.
⑥Green cursor of main waveform represents starting point, and white represents end
point, and between green ~ white is the length of the cable.
⑦Main waveform display area.
⑧Lower row of shortcut keys area.
⑨Power prompt area indicates DC or AC power supply. It displays battery voltage
when it’s DC supply, and it displays rectified AC voltage when it’s DC supply.
⑩Time - date display, a dedicated clock circuit inside, and a dedicated battery.
○
11 Moves selection: Shortcut key. Select to move cursor or move waveform. When
you select "cursor", up and down arrow keys are to move the cursor. When you select
"wave", up and down arrow keys to move waveform (Waveform can only be moved
in waveform comparison function mode or multiple pulse mode).
○
12 Filtering methods: Shortcut key. Select filtering methods of waveform quickly.
There are a total of four kinds of filtering methods, which are 0-3. You can choose
different filtering method to filter out interference in some ways. 0 = no filter, 1 =
light filtering, 2 = emphasis filtering, and 3 = depth filter. Usually select 0 or 1.
○
13 Speed selections: Shortcut keys. Switch quickly in the four kinds of speed of 160,
172, 184, 196.
○
14 Sampling frequency: Shortcut keys. Switch quickly in the three kinds of sampling
speed. 120M, 60M, 30M.
○
15 Sampling method: Shortcut keys. Switch quickly in the three kinds of sampling
mode. Pulse, flash, multiple pulses.
IV. Notes
★If you want to use the internal battery, ensure that the battery is fully charged,

which means being charged for more than three hours when the power switch is off.
★Ensure that the battery is fully charged every three months, and so ensure the
battery life.
★Screen will go into protection mode if there are four minutes without any
operation when it’s AC power supply, and click anywhere on the screen to exit this
protection.
★Screen will go into protection mode if there is 1 minute without any operation
when it’s DC power supply, and click anywhere on the screen to exit this protection.
During DC power supply process, it will tweet at any time. With time flying, battery
power will decline, and tweet will thereupon become urgent. When voltage arrived at
10.5V, screen will not be turned on, so please turn off the switch immediately to
charge.
★Note: When measure with high-voltage mode, the cable fault tester host should
use the battery with it to avoid interfering signals.
★Directly connecting the instrument to high-voltage is strictly banned, otherwise
it will damage the instrument.
★If you are using the extension cable or delay instrument to perform test from the
start point of the waveform cursor, then the result should subtract the distance of the
extension cable or delay instrument.
V. Host Operating Procedures
1. Connect "input","output" signal base according to the corresponding test method(If
it’s a fully integrated configuration, simply corresponds to all access required). And
turn on the power switch.
Low-voltage pulse test mode: Connect "input", "output" signal base
Multiple pulse/DC arc extension test mode: Connect "input", "output" signal

base
Sampling voltage / current sampling test method: Connect "input" signal base
2. Go to the first screen, press touch screen to enter "Select the length range of the
cable under test", and you should select item greater than the total length of the cable
under test. Press OK to enter the main test interface.
3. ①Select "Sampling Mode (touch cycle selection)," according to corresponding test
methods:
Low-voltage pulse test mode: Pulse
Multiple pulse/DC arc extension test mode: Multiple Pulse
Voltage sampling/current sampling test mode: High flashover
②Select "Electric Wave Speed" according to media type of the cable under
test(You can touch cycle selection, which will show several commonly used wave
speed of cable, for example: for XLPE cables, you can choose "172m /μs"; If
"Electric Wave Speed" is not in these types, press "Settings" - "Speed setting" to
select)
③Magnitude knob can be placed on about one-third.
4. Press "Sampling" key to collect test waveform. The upper window shows the whole
picture of waveform area, and the lower shows the main waveform window area.
①Press screen between the two waveform on the upper window, and the
instrument can automatically find the corresponding short-circuit waveform, which
can be displayed on the lower window together with open-circuit waveform when it’s
multiple pulses or DC arc delay test mode.
When it’s waveform comparison, multiple pulses, DC arc extension mode and
"Moves Selection" is "wave", you can use"↑" "↓" "←" "→" to align inflections of the
two waveform on the lower window.
②If you think that the entire waveform baseline is inappropriate, press "↑" "↓"
keys to adjust(when it’s multiple pulses, DC delay arc mode, "Moves Selection" must

be in "cursor" status, which is valid), and re-sampling takes effect.
③If you think the amplitude of the overall waveform is inappropriate, you can
adjust "Amplitude Adjustment" knob to adjust, and re-sampling takes effect.
④If you want to compress or expand on left and right side to waveform on the
lower window, press "+" "-" keys to compress or expand waveform immediately; Or
press "Sampling Frequency" key to select a different sampling frequency, and
re-sampling takes effect.
⑤Vertical cursor is used to calibrate distance(when it’s waveform comparison,
multiple pulses, DC arc extension mode, "Moves Selection" must be in "cursor" state):
Press inflection point at the start, and the vertical cursor will move over here, then you
can press "←" "→ "key to fine-tune; Press "Starting Point" to locate this cursor. Press
Inflection point on terminal, and the other vertical cursor will move over here, and
you can press "←" "→" key to fine-tune. "Fault Distance" on the screen displays the
distance between the two cursors.
5. If the cable is in an open or near fault state, it may be necessary to compress the
ratio of the upper and the lower window; "Settings" - "Pulse Settings" - "Delay" /
"Interval" / "Pulse" for anew setting, and re-sampling takes effect.
From left to right: 开机： Power on 选择采样方式：Sampling mode selection
选择采样速度 Sampling speed selection 选择滤波方式：Filter mode selection
采样：Sampling 分析波形：Analyzing waveform
存储波形：Storing waveform 打印波形：Printing waveform

VI. Usage of Each Function Menu, Main Menu on the Main
Interface and Settings
1. Function of the Lower Row Keys
* "Setting" button: Turn on the setting function. Each function will be set in a new
opened menu.
* "Starting Point" key: White cursor point in the waveform will be the starting point
for calculating the cable length.
* " " Key: To compress the waveform in main display area, the compression factor
is the value of K2 displayed on the right.
* " " Key: Zoom the waveform in main display area, the compression factor is the
value of K2 displayed on the right.
* "↑" Key: To adjust sampling reference point and move upward, the position
indicating benchmark of left triangle appeared(In the waveform comparison and
multiple pulses mode, available to move up waveform).
* "↓" Key: To adjust sampling reference point and move downward, the position is
indicating benchmark of left triangle appeared(In the waveform comparison and
multiple pulses mode, available to move down waveform).
* "←" Key: To move current cursor to the left, fast-moving after holding on for 0.5
seconds.
(In waveform comparison and multiple pulses mode, available to move left
waveform)
* "→" Key: To move current cursor to the right, fast-moving after holding on for 0.5
seconds.
(In waveform comparison and multiple pulses mode, to move right waveform is
available).

* "Sampling" Key: To start sampling, if you want to stop sampling, touch anywhere
on the screen to end it.
2. Usage for Each Function Key
"Settings" key is used to open a new menu, to set various parameters and the
desired operation, or to enter corresponding interface when you need to adjust
parameters or process waveform.
Menu will display as follows after you press "Settings" key:
Menu Displayed After Pressing "Settings" Key
Left: 基本参数："Basic Parameters" 脉冲设置："Pulse Settings"
速度设置："Speed Settings" 电缆测速： "Cable Speed"
波形处理： "Waveform Processing" 时间设置： "Time Setting"
返回："Exit"
Right: 采样方式：Sampling mode 采样频率: Sampling frequency
电波速度:Electrical wave 滤波方式: Filter mode
移动选择 Moves selection