CP CU1 - Coupling unit for line and ground testing
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CP CU1 Coupling unit for line and ground testing

Line and ground test system – CPC 100 The CPC 100 is a multifunctional test set for primary assets. When combined with the CP CU1 it covers the following tests: >> Line impedances of overhead lines and power cables for distance relay parameterization >> Mutual coupling impedances between parallel lines >> Ground impedances of large substations (fall-of-potential or 3-point test) >> Step and touch voltages >> Reduction factor >> Coupling of power lines into signal cables HGT1 – Handheld grounding tester

+ CP CU1 Safe testing Measurements on power lines require special safety precautions. The CP CU1 ensures the galvanic isolation of the user from the line under test for enhanced protection. In addition the CP GB1 features high current surge arrestors to protect the CP CU1 and the CPC 100 from unexpected overvoltages on the line under test. Up to 30 kA can be safely diverted to ground. Using a digital filter for the current and voltage measurements allows power frequency interference to be suppressed effectively and the test parameters to be determined accurately. Accurate and light-weight...

Line impedance measurement X in Ω Line parameters for distance protection Zone under- and overreach These parameters are often calculated from software tools, which do not provide actual line parameters due to unknown soil properties, such as different soil resistivities, pipelines or other unknown conductors. This leads to under- or overreach of your distance protection relay resulting in outage and loss of grid stability. Correct line parameters are crucial for reliable and selective distance protection. The set of parameters contains the positive and the zero sequence impedance (Z1, Z0)...

Test set-up The CP GB1 protects the test equipment and the user from any unexpected overvoltage on the line under test. Furthermore it allows a direct connection to the power line for a convenient execution of the test. The test set-up for a line impedance measurement is shown below. The loops A-B, B-C and A-C are measured to determine Z1. The loop ABC-G is measured to determine Z0. K-factor formats commonly used in distance relays are then calculated from these two values. A dedicated test template provides the positive and the zero sequence impedance as well as the k-factor in commonly...

Grounding system testing Personnel safety Ground Impedance measurement (3-point test) In the event of a ground fault hazardous step and touch voltage can occur inside and outside of a substation. Ground tests prove the effectiveness of grounding systems and guarantee safety of people inside and outside the substation. * For the fall-of-potential measurement according to EN 50522 and IEEE 81 the voltage between the ground grid and ground electrodes in different distances to the ground grid is measured until reference ground is reached. PTM instantly transforms the test results into a voltage...

Step and touch voltage measurement Step and Touch voltage measurements according to EN 50522 or IEEE 81 are performed at locations inside and outside the substation. PTM automatically assesses the measurements according to EN 50522 or IEEE 80. Tests can be executed quickly and easily since long test cables for connecting to the main device are no longer necessary. Measurement advantages: > Determine true test values by power line injection > Ground Impedance and Step and Touch voltage Testing with PTM and HGT1 > Automated GPS Tracking > Offline Usage of BING maps > Charts and Final results...

Test templates We provides dedicated Microsoft Excel™ test templates for line and ground testing. This allows reporting and test data assessments to be performed quickly and easily. Line impedance The line impedance test template shows the actual zone reach of an arbitrary parameter set (X-value of the zone and k-factor) based on the measured impedances. The example on the left refers to the settings of the first zone (usually 80 % zone reach) which reveals a zone underreach for ground faults. Ground testing Primary Test Manager (PTM) in combination with the HGT1 supports fully automated...

CPC 100: the all-in-one system Featured assets The CPC 100 covers a lot of other applications in and around substations as well as at the manufacturer’s production site. This powerful device provides up to 800 A or 2 kV with up to 5 kVA over a frequency range of 15 Hz to 400 Hz or 400 ADC. >> Current transformers >> Voltage transformers >> Power transformers It can test various substation assets, thereby replacing several individual testing devices. This makes testing with the CPC 100 a time-saving and cost-effective alternative, especially as the application range of the CPC 100 is further...

CPC 100* Power specifications Single-phase, nominal1 Single-phase, permissible Frequency, nominal Mechanical data Dimensions (W x H x D) (cover without handles) Weight (case without protection cover) Output rangesRange Current 10 A 0 ... 10 Arms Measuring transformersTransformer Ratio Compliance voltage at > 45 Hz CP GB1_ Nominal ac spark-over voltage Impulse spark-over voltage Short circuit proof with: 16 mm cylindrical or 20 mm ball studs 25 mm ball studs Torsional moment for changing arrestors Dimensions (0 x H) Weight 26.5 kA (< 100 ms) / 67 kApeak 30 kA (< 100 ms) / 75 kApeak >...

Ordering information CP CU1 Packages Package Upgrade opiton to expand your existing CPC 100 to a line impedance measurent test system. Note: CP sequencer test card has to be ordered separately (order no. VESM0635) CPC 100 Line Impedance Test System Package including CPC 100, CP CU1, CP GB1 and all accessories to perform impedance measurements for determination of distance protection relay settings. Step & Touch Voltage Set for CP CU1 Package to measure step and touch voltages within HV stations and surrounding areas. Including handheld grounding tester HGT1 and accessories. Upgrade option...