CT6876
OK NO
CT6876-01
AC/DC CURRENT SENSOR
Instruction Manual
Dec. 2018 Edition 1
CT6876A961-00 18-12H
EN
Safety Information
Symbols Afxed to the Device
Indicates cautions and hazards. When the symbol is
printed on the instrument, be sure to also read the
accompanying “Operating Precautions” before use.
DANGER
• If the cable insulator melts, metal parts could be
exposed, posing a hazard. Keep the cable away
from sources of heat.
• Connect the device to only the secondary side of
a distribution panel. Even if a short-circuit occurs
on the secondary side of the distribution panel,
the distribution panel will interrupt a short-circuit
current. Do not connect it to the primary side of
the distribution panel because an unrestricted
current ow could damage the device and
facilities if a short-circuit occurs.
WARNING
Do not place the cable in contact with the
measured line. Any contact can cause the device
to malfunction and lead to a short-circuit or electric
shock.
Name of Each Part
Mounting holes
Top view
32
4−φ 5.20
Current direction indicator
135
Output connector
Front view
Cable
Through
window
12.5
(Unit: mm)
Measurement Procedure
IMPORTANT
Make sure to pass only one
conductor through the window.
Whether the power is single-phase
or three-phase, the devise cannot
measure a current if two or more of the
conductors pass through the window in
a bundle.
Shield
The device cannot accurately
measure a current that passes
through a conductor sheathed with
a grounded shield.
• Arrange the conductor as close to the center of the through window
as possible. For a current to be measured of frequency 1 kHz or
more, the conductor position could cause increase in measured
value error or distortion of output-signal waveforms.
• If a conductor not being measured carries a current of frequency 1
kHz or more, keep such conductor at least 100 mm away from the
device. Failure to observe this could cause increase in measured
value error or distortion of output signal waveforms.
• Use the device with its surface temperature of 105°C or less.
Warranty
Warranty malfunctions occurring under conditions of normal
use in conformity with the Instruction Manual and Product
Precautionary Markings will be repaired free of charge. This
warranty is valid for a period of three (3) years from the date
of purchase. Please contact the distributor from which you
purchased the product for further information on warranty
provisions.
Introduction
Thank you for purchasing the HIOKI Model CT6876, CT687601 AC/DC Current Sensor. To obtain maximum performance
from the product over the long term, be sure to read this
manual carefully and keep it handy for future reference.
Be sure to also read the accompanying “Operating Precautions”
before use.
Target audience
This manual has been written for use by individuals who
use the product in question or who teach others to do so.
It is assumed that the reader possesses basic electrical
knowledge (equivalent to that of someone who graduated
from the electrical program at a technical high school).
Troubleshooting
If the device seems to be malfunctioning, contact your authorized
•
Hioki distributor or reseller.
Store the packaging materials even after unpacking, because you
•
will need them when you transport the instrument.
CAUTION
• To prevent cable damage, do not step on cables or
pinch them between other objects. Do not bend or pull
on cables at their base.
• Do not place the device on an unstable table or an
inclined place. Dropping or knocking down the device
can cause injury or damage to the device.
• The cable is hardened in freezing temperatures. Do
not bend or pull it to avoid tearing its shield or cutting
the cable.
• When the power to lines to be measured is turned on
or off, a current owing through the lines can exceed
considerably the maximum allowable current of the
device. This could result in damage to the device.
Make sure that there is not any over-current.
• Make sure that applying any current could cause
damage to the device if it is turned off.
Overview
This pull-through current sensor has excellent frequency
characteristics (amplitude, phase) and temperature
characteristics (sensitivity, offset), which enables high-precision
power measurement as well as current measurement.
Use with Other Hioki Products
This device is used in connection with a dedicated instrument (Hioki
product). Refer to “Combined accuracy and conditions” specied in
the specications for details.
Inspection Before Use
Verify that the device operates normally to ensure that no damage
occurred during storage or shipping. If you nd any damage, contact
your authorized Hioki distributor or reseller.
Check Items Remedy
Is the device cracked or
damaged?
Is the cable insulation
torn?
Is the cable broken at the
base (of the connector or
the sensor)?
If there is any damage, electric
shock may result. Discontinue use
and contact your authorized Hioki
distributor or reseller.
Broken connections will make proper
measurement impossible.
Discontinue use and contact your
authorized Hioki distributor or reseller.
Wiring
Make sure the direction of the arrow on the case matches the
direction of the current ow, as shown in the gure below. If they
are oriented incorrectly, the output signal from the sensor will be
reversed. When using the device in combination with a power meter,
conform to the power meter’s wiring method.
High
Arrow on cace
LoadSouce
I
Low
(Current direction indicator)
Options
CT9901 Conversion Cable
Connecting the CT9901 enables the device to connect to an instrument that
does not support direct connection with the device (No accuracy is affected).
CT9902 Extension Cable
• Connecting a CT9902 enables the device cable to be extended by 5 m (max.
10 m).
• Up to two of the Extension Cable available (If three or more extension
cables are connected to the device, its performance is not guaranteed)
• Add the following to the sensor accuracy for each cable used:
Amplitude accuracy
Phase accuracy: ±（0.03 × f*）°（1 kHz < f*
*: frequency
± 0.1% rdg. (DC ≤ f * ≤ 1 kHz)
：
± (0.1+0.01 × *f)% rdg. (1 kHz < f*)
：
）
Phase Correction Values
Enter the following correction values (representative values) when
performing phase correction on the PW6001 or PW3390.
CT6876: 200 kHz -12.96°
CT6876-01: 200 kHz -14.34°
1 2 3 4
Specications
-8
-6
-4
-2
0
2
4
-10
-8
-6
-4
-2
0
2
10 100 1 k 10 k 100 k 1 M
Phase [º]
Gain [dB]
Frequency [Hz]
Gain
Phase
Phase(Corrected)
200
-8
-6
-4
-2
0
2
4
-10
-8
-6
-4
-2
0
2
10 100 1 k 10 k 100 k 1 M
Phase [º]
Gain [dB]
Frequency [Hz]
Gain
Phase
Phase(Corrected)
100
120
140
160
180
200
10 100 1k 10k 100k 1M
CMRR [dB]
Frequency [Hz]
30
Input current[A]
Accuracy
f.s.: Maximum display value or scale length (The rated measurement
current)
rdg.
: Reading value (The value currently being measured and indicated on
the measuring instrument)
1. General Specications
Operating
environment
Operating
temperature and
humidity
Storage temperature
and humidity
Standards Safety: EN 61010
Dielectric strength 7.4 kV AC (sensed current: 1 mA) 50 Hz/60 Hz for 1
Power supply Supplied from PW6001, PW3390, CT9555,
Maximum rated
power
Interface Dedicated interface (ME15W)
Dimensions Approx. 160W × 112H × 50D mm
Output cable length CT6876: Approx. 3 m
Mounting hole
diameter
Mass CT6876: Approx. 950 g (33.5 oz.)
Product warranty
period
Accessories Mark bands ×6
Options CT9901 Conversion Cable
2. Input / Output / Measurement Specications
-1. Basic specications
Rated current 1000 A AC/DC
Measurable
Maximum input
current
conductor diameter
Output voltage 2 mV/A
Maximum rated
voltage to earth
Output resistance 50
Indoors, Pollution Degree 2,
altitude up to 2000 m (6562 ft.)
−40°C to 85°C (-40°F to 185.0°F)
80% RH or less (no condensation)
−40°C to 85°C (-40°F to 185.0°F)
80% RH or less (no condensation)
EMC: EN 61326
minute, between through window and cable output
terminal
CT9556, CT9557, or external DC power supply
Rated supply voltage: ±11.5 V to ±15 V (Tracking)
Maximum rated current: ±450 mA (1000 A/55 Hz
measurement, ±12 V power supply)
7.5 VA (1000 A/55 Hz measurement, ±12 V power
supply)
(6.30″W × 4.41″H × 1.97″D)
(excluding protrusions and the cable)
CT6876-01: Approx.10 m
5.2 mm (M5 screw, recommended tightening
φ
torque: 1.5 Nm to 2.0 Nm)
CT6876-01: Approx. 1250 g (44.1 oz.)
3 years
Instruction Manual (JA, EN, CN)
Operating Precautions (0990A907)
CT9902 Extension Cable
36 mm or less
φ
Not exceeding derating curve shown in Figure 1
Provided that measurement is performed at 40°C
or less and nishes within 20 ms. ±1800 A peak is
allowable
1000 V (Measurement category III)
Anticipated transient overvoltage: 8000 V
±10
Ω
Ω
1 2 3 4
-2. Accuracy specications
Conditions of
guaranteed
accuracy
Guaranteed accuracy period: 1 year
Guaranteed accuracy period after adjustment made by
Hioki: 1 year
Accuracy guarantee for temperature and humidity: 0°C to
40°C (32°F±104.0°F), 80% RH or less
No warm-up required, sine wave inputted, connected
with measuring instrument with input resistance 1 MΩ or
more, line-to-ground voltage: 0 V, no external magnetic
eld, conductor arranged at center of window
Measurement accuracy
Frequency Amplitude Phase
DC ±0.04% rdg.±0.008% f.s.
DC < f < 16 Hz ±0.1% rdg.±0.02% f.s. ±0.1°
16 Hz ≤ f < 45 Hz ±0.05% rdg.±0.01% f.s. ±0.1°
45 Hz ≤ f ≤ 66 Hz ±0.04% rdg.±0.008% f.s. ±0.1°
66 Hz < f ≤ 100 Hz ±0.05% rdg.±0.01% f.s. ±0.1°
100 Hz < f ≤ 500 Hz ±0.1% rdg.±0.02% f.s. ±0.2°
500 Hz < f ≤ 1 kHz ±0.2% rdg.±0.02% f.s. ±0.4°
1 kHz < f ≤ 5 kHz ±0.5% rdg.±0.02% f.s. ±0.5°
5 kHz < f ≤ 10 kHz ±0.5% rdg.±0.02% f.s. ± (0.1×f)°
10 kHz < f ≤ 50 kHz ±2% rdg.±0.05% f.s. ± (0.1×f)°
50 kHz < f ≤ 100 kHz ±3% rdg.±0.05% f.s. ± (0.1×f)°
100 kHz < f ≤ 1 MHz
Frequency range 1.5 MHz
± (0.03×f)% rdg.±0.05% f.s.
±3 dB Typical
(
)
• Symbols f in accuracy expressions are represented in kHz.
• Accuracy of amplitude and phase is specied with 110% f.s. input or less
and not exceeding derating curve in Figure 1.
Accuracy in range of DC < f < 10 Hz are design value.
• Add ±0.01% rdg. to amplitude accuracy when input is 100% f.s. to 110% f.s.
• For Model CT6876-01, add the following values to accuracy in the range
of 1 kHz < f ≤ 1 MHz.
Amplitude accuracy: ±(0.005×f)% rdg.
Frequency band of 1.2 MHz (±3 dB Typical
Phase accuracy: ±(0.015×f)°
Linearity
Offset voltage
*1 *2
*2
±15 ppm Typical (23
±5 ppm Typical (23
°C)
°C, no input)
*1: Output voltages are measured while input currents (DC) are changed in
steps of 200 A beginning from +1000 A to −1000 A and then to +1000 A.
Dened as the difference between the regression line calculated from
the above measurements and the measurement points.
*2: Dened as a percentage of the rated current.
Output noise 300 µV rms or less (≤1 MHz)
Effect of
temperature
Within the range of -40°C to 0°C or 40°C to 85°C
Amplitude sensitivity: ±20 ppm of rdg./°C
Offset voltage: ±5 ppm of f.s./°C
Effect of
magnetization
Common mode
rejection ratio
(CMRR)
Effect of conductor
position
20 mA or less
(input equivalent, after 1000 A DC is inputted)
140 dB or more (50 Hz/60 Hz)
120 dB or more (100 kHz)
(Effect on output voltage/common-mode voltage)
DC, 50 Hz/60 Hz：±0.01% rdg. or less
(input current: 100 A)
10 kHz：±0.5% rdg. or less (input current: 10 A)
100 kHz：±3% rdg. or less (input current: 10 A)
When wire of outer diameter 10 mm is used
Effect of radiated
0.5% f.s. or less at 10 V/m
radio-frequency
electromagnetic
eld
Effect of conducted
0.2% f.s. or less at 10 V
radio-frequency
electromagnetic eld
Effect of external
magnetic eld
40 mA or less (input equivalent, under a magnetic
eld of 400 A/m DC or 400 A/m with 60 Hz)
± (0.1×f)°
)
3. Function Specications
-1. PW6001 Power Analyzer
Combined accuracy
Frequency Current Power Phase
DC
45 Hz ≤ f ≤ 66 Hz
DC,
band other than
45 Hz ≤ f ≤ 66 Hz
±0.06% rdg.
±0.038% f.s.
(f.s.: The
measurement range
set on the PW6001)
±0.06% rdg.
±0.028% f.s.
(f.s.: The
measurement range
set on the PW6001)
PW6001 accuracy
+ sensor accuracy
(Consider sensor
rating for f.s. error.)
±0.06% rdg.
±0.058% f.s.
(f.s.: The measurement
range set on the
PW6001)
±0.06% rdg.
±0.038% f.s.
(f.s.: The measurement
range set on the
PW6001)
PW6001 accuracy
+ sensor accuracy
(Consider sensor rating
for f.s. error.)
PW6001
accuracy
+
sensor
accuracy
• For other measurement parameters, add PW6001 accuracy and sensor
accuracy together (consider sensor rating for f.s. error).
• For the 20 A range or the 40 A range, add ±0.2% of the measurement range
set on the PW6001.
• Add accuracy according to each condition in specications of the power
analyzer and sensor.
-2. PW3390 Power Analyzer
Combined accuracy
Frequency Current Power Phase
DC
45 Hz ≤ f ≤ 66 Hz
DC,
band other than
45 Hz ≤ f ≤ 66 Hz
±0.09% rdg.
±0.078% f.s.
(f.s.: The
measurement range
set on the PW3390)
±0.08% rdg.
±0.058% f.s.
(f.s. The
measurement range
set on the PW3390)
PW3390 accuracy +
sensor accuracy
(Consider sensor
rating for f.s. error.)
±0.09% rdg.
±0.078% f.s.
(f.s. The
measurement range
set on the PW3390)
±0.08% rdg.
±0.058% f.s.
(f.s. The
measurement range
set on the PW3390)
PW3390 accuracy +
sensor accuracy
(Consider sensor
rating for f.s. error.)
PW3390
accuracy
+
sensor
accuracy
• For other measurement parameters, add PW3390 accuracy and sensor
accuracy together (consider sensor rating for f.s. error).
• For the 20 A range or the 40 A range, add ±0.2% f.s. of the measurement
range set on the PW3390.
• Add accuracy according to each condition in specications of the power
analyzer and sensor.
-3. CT9555, CT9556, CT9557 Sensor Unit
Combined accuracy
• Sensor accuracy is applicable (with output coaxial cable of length 1.6 m or less)
• Add sensor unit accuracy when RMS output or total output is used.
• Add accuracy according to each condition in specications of the products
to be connected and sensor.
.
-4. U8977 3CH Current Unit
Combined accuracy
U8977 accuracy + sensor accuracy
Add accuracy according to each condition in specications of Memory HiCorder to be
connected and sensor.
-5. Other connectable products
Connecting CT9901 Conversion Cable enables the device to be used in combination
with the following prodcuts:
Combined
product
9555-10
Sensor Unit
3390, 3390-10
Power Analyzer
9602
AC/DC Clamp
Input Unit
3334-10
AC/DC Power
Hitester
8971
Current Unit
Sensor accuracy (with output coaxial cable of length 1.6 m or less)
Recognized as [AC/DC500 A] Set CT ratio to [2].
(Combined accuracy) = (3390 [-10] accuracy) +(sensor accuracy),
When installed in 3193-10, recognized as [AC/DC500 A].
Set CT ratio to [2].
(Combined accuracy) = (9602 accuracy) + (sensor accuracy) +
Recognized as [AC/DC500 A] Set CT ratio to [50].
(Combined accuracy) = (3334-10 accuracy) +(sensor accuracy);
The 9318 Conversion Cable (accessory of 8971) is required.
Recognized as [AC/DC500 A] by the instrument equipped with
auto-recognition. Set SC ratio to [2].
(Combined accuracy) = (8971 accuracy) + (sensor accuracy)
Combined accuracy and conditions
(power factor: 1)
(±0.1% rdg.); (power factor: 1)
(power factor: 1)
Figure 1. Frequency Derating Curve
2 k
1 k
Continuous input at an ambient temperature of 60C or less
Continuous input at an ambient temperature of 85C or less
Characteristics
Frequency characteristics (Typical)
2
0
-2
-4
Gain [dB]
-6
-8
-10
CMRR (Typical)
180
160
140
CMRR [dB]
120
100
Linearity error (Typical)
20
10
0
-10
Linearity error [ppm of f.s.]
-20
-30
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Gain
Phase
Phase(Corrected)
10 100 1 k 10 k 100 k 1 M
Frequency [Hz]
10 100 1k 10k 100k 1M
Frequency [Hz]
4
2
0
-2
Phase [º]
-4
-6
-8
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