Universal High Voltage Reference DividerType ID-0500-CD00Instruction Manual Manual_RefTeiler_Englisch.DOC/MD Page 1 of 8

Safety precautions 1.1 Safety 1.2 Safety precautions 1.3 Impaired Safety Precautions 2. 2.1 Function Principle 2.2 Design of the Measuring System 2.3 Connection and Operation of the Divider in a High-Voltage Laboratory 3. Technical Data

Safety precautions 1.1 Safety The instrument described in this manual is designed to be used by properly trained personnel only. Adjustment, maintenance and repair of the exposed equipment should be carried out only by qualified personnel aware of the hazards involved. 1.2 Safety precautions For correct and safe use of this instrument it is essential that both operation and service personnel follow generally accepted safety procedures in addition to the safety precautions specified in the manual. Specific warning and caution statements, where they apply, will be found throughout the manual. Safety...

2.1 Function Principle The reference divider is composed of a main divider, a coaxial connection cable and an attenuator (Fig.1.). The reference divider is based on the principle of the well-known “damped capacitor” divider. The theory and practical examples of such dividers have been described in many publications and books. Fig. 1 The main divider consists of a high-voltage (h.v.) arm (series connection of CH and RH) and a low-voltage (l.v.) arm (series connection of CL and RL). The time constants τH and τL of each arm are matched for optimum frequency response. The basic working principle...

parallel arrangement is necessary to minimize the effect of stray inductance in the l.v. arm. Being a typical phenomenon with impulse high-voltage dividers, excessive inductance would cause severe ringing(oscillations) and distortion of the divided h.v. input signal seen at the output of the divider. Therefore care has been taken in the design of this divider to minimize such effects. The output of the main divider is matched to the nominal output impedance of Z= 75 Ω by means of the matching resistor Radd. A standard coaxial cable, type RG-11/U, Z=75 Ω cable of 20 meters length is used as signal...

2.2 Design of the measuring system The High Voltage Part is assembled on a PMMA supporting elements and built into a PMMA tube. The below Fig.2 shows the ceramic disk-type capacitors that form the capacitance CH, the 22Ω resistors that form RH and the 40MΩ resistors for the DC-branch RHDC: ceramic disk capacitor The l.v. arm is of coaxial construction and is located in the lower part of the divider. The output socket of the main divider is a standard "C" Type HF socket. The main divider is filled with pure SF6 gas at low pressure (approx 30 mbar). The gas filling allows for an additional safety...

Connection and Operation of the Divider in a High-Voltage Laboratory In order to assure a safe and reliable operation the main divider must be earthed properly. Insufficient or inappropriate earth connections can be extremely dangerous due to the possibility of dangerous voltages at the cable connectors and sockets, the attenuator or the attached measuring instrument. The operator should always be aware of this potential hazard while using the divider ! Furthermore a good earth connection is extremely important in order to avoid the phenomenon of “ground bounce” at the ground terminal of the...

3. Technical Data Universal High Voltage Reference Divider Rated voltages Lightning impulse voltage Front- chopped lightning imp. Voltage AC Voltage DC Voltage Measurement uncertainty Lightning impulse voltage Front- chopped lightning imp. voltage (Tc=500 ns) AC Voltage DC Voltage Time parameters Unit step response data Experimental response time TN Partial response time Ta Settling time ts Impedances and ratios High voltage capacitor CH Scale factor without LV attenuator DC HV resistor AC scale factor DC scale factor Matching Reference conditions Temperature Humidity Barometric pressure Rated...