High-Voltage Capacitive Compensation Unit for Transformer and Shunt Reactor Testing, Type HVCC
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1 HIGHVOLT Prüftechnik Dresden GmbH Marie-Curie-Straße Dresden, Germany Phone Fax sales@highvolt.de Website Data Sheet /1 High-Voltage Capacitive Compensation Unit for Transformer and Shunt Reactor Testing, Type HVCC Application The High-Voltage Capacitive Compensation Unit (HVCC) is an extension to the test systems type WV. It can be used for: Measurements of short-circuit impedance on transformers, Measurements of load loss on transformers and shunt reactors, Temperature-rise tests on transformers and shunt reactors, Test on on-load tap changers (OLTC) on transformers and shunt reactors, Determination of reactance and linearity of reactance on shunt reactors, Induced-voltage tests on shunt reactors. These tests require a very high capacitive reactive power up to 2~4 Mvar. Since the power capacity of the control and feeding converter (type CFI) is limited (Data Sheet 8.73), a HV Capacitive Compensation Unit is necessary. It covers most of the capacitive reactive power requirements. The CFI converter needs only to supply the necessary active power and a small part of reactive power, which is not compensated by the HV capacitive compensation unit. To comply with the power capacity of the CFI converter, the HV capacitive compensation unit is designed with fine power graduation. Design Fig. 1 shows a schematic circuit diagram of the HV Capacitive Compensation Unit. The capacitor or capacitor groups can be selected and connected manually with plug-in contacts or automatically with off-load disconnectors. According to the test voltage, the number of capacitors to be connected in series will be defined. According to the test power, the number of capacitors to be connected in parallel can be selected. A three-phase disconnector with earthing switch is used to connect the HV capacitor unit to the output terminals of the transformer test system. For the purpose of safety and protection, each capacitor is equipped with a discharge resistor. Most of the capacitors are equipped with internal fuses. The unit consists of three phase banks. Each phase bank consists of two subbanks of capacitors. The whole three-phase capacitor bank is configured as a double-star circuit for three-phase application. In case of single-phase operation, the two phase banks (U and V) build up an H-bridge circuit. Three phase-current instrument transformers (CT1, CT2 and CT3 in Fig. 1), an unbalance current instrument transformer (CT4 in Fig. 1) and a capacitor protection relay are used to detect the unbalance, which occurs in case of wrong connections or defect capacitors. HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 1/1
2 1 2 3 S1 S2 S3 CT1 CT2 CT3 Y1 CT4 Y2 5 KY1 KY2 4 1 CFI converter (Data Sheet 8.73) 2 Tapped transformer (Data Sheet 8.75) 3 Test object 4 HVCC protection box 5 Capacitor CT1, CT2, CT3 Phase current instrument transformers CT4 Unbalance current instrument transformer KY1, KY2 Star-point disconnectors S1, S2, S3 HVCC disconnector with earthing switch Fig. 1: Schematic circuit diagram of the HV Capacitive Compensation Unit HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 2/1
3 Technical Data of Manual HV Capacitive Compensation Unit Type designation HVCC a/b a = maximum compensation power in kvar at maximum operation voltage and a frequency of 5 Hz b = maximum operation in kv Table 1: Technical data of manual HV Capacitive Compensation Unit (1 ) Type HVCC 97/12 HVCC 13/24 HVCC 54/36 Operation voltage (rms) (kv) Test voltage at power frequency (kv) Max. operation current (A) Operation frequency (Hz) 5 / 6 5 / 6 5 / 6 at 5 Hz (kvar) at 6 Hz (kvar) Max. power graduation at 6 Hz (kvar) Losses (kw) Quantity of oil (l) Leakable oil (l) Compensation power dependent on test voltage See Fig. 2 See Fig. 3 See Fig. 4 Standard IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 Interfaces for Control Operation voltage (V AC) 23/4 23/4 23/4 Operation current (A) max. 5 max. 5 max. 5 Dimensions, Environment Dimensions (LxWxH) (m) 5.5 x 5.25 x x 5.25 x X 5.2 x 2.4 Weight (t) Installation Indoor, stationary Indoor, stationary Indoor, stationary Ambient temperature ( C) Height above sea level (m) Humidity (%) (no condensation) (no condensation) 9 (no condensation) HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 3/1
4 Type designation HVCC a/b a = maximum compensation power in kvar at maximum operation voltage and a frequency of 5 Hz b = maximum operation voltage in kv Table 2: Technical data of manual HV Capacitive Compensation Unit Type HVCC 1/42 HVCC 75/54 HVCC 132/72 Operation voltage (rms) (kv) Test voltage at power frequency (kv) Max. operation current (A) Operation frequency (Hz) 5 / 6 5 / 6 5 / 6 at 5 Hz (kvar) at 6 Hz (kvar) Max. power graduation at 6 Hz (kvar) Losses ( kw ) Quantity of oil (l) Leakable oil (l) Compensation power dependent on test voltage See Fig. 5 See Fig. 6 See Fig. 7 Standard IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 Interfaces for Control Operation voltage (V AC) 23/4 23/4 23/4 Operation current (A) max. 5 max. 5 max. 5 Dimensions, Environment Dimensions (LxWxH) (m) 14. x 6.41 x x 5.5 x x 6.5 x 3.26 Weight (t) Installation Indoor, stationary Indoor, stationary Indoor, stationary Ambient temperature ( C) Height above sea level (m) Humidity (%) (no condensation) (no condensation) 9 (no condensation) HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 4/1
5 Type designation HVCC a/b a = maximum compensation power in kvar at maximum operation voltage and a frequency of 5 Hz b = maximum operation voltage in kv Table 3: Technical data of manual HV Capacitive Compensation Unit Type HVCC 14/9 HVCC 19/9 HVCC 2/1 Operation voltage (rms) (kv) Test voltage at power frequency (kv) Max. operation current (A) Operation frequency (Hz) 5 / 6 5 / 6 5 / 6 / 2 *1) at 5 Hz (kvar) at 6 Hz (kvar) Max. power graduation at 6 Hz (kvar) Losses (kw) Quantity of oil (l) Leakable oil (l) Compensation power dependent on test voltage See Fig. 8 See Fig. 9 See Fig. 1 Standard IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 Interfaces for Control Operation voltage (V AC) 23/4 23/4 23/4 Operation current (A) max. 5 max. 5 max. 5 Dimensions, Environment Dimensions (LxWxH) (m) 2. x 8. x x 8. x x 6.45 x 3.76 Weight (t) Installation Indoor, stationary Indoor, stationary Indoor, stationary Ambient temperature ( C) Height above sea level (m) Humidity (%) (no condensation) (no condensation) (no condensation) *1) In case of operation frequency of 2 Hz, the HV capacitive compensation unit can be used only at up to 55 % of the rated operation voltage. HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 5/1
6 (1) Current limit:1 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 1 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 2: Compensation power dependent on the test voltage for type HVCC 97/ (1) Current limit: 1 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 1 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 3: Compensation power dependent on the test voltage for type Mobile-HVCC 13/ ( Three-Phase Operation) (1) Current limit: 2 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 2 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 4: Compensation power dependent on the test voltage for type HVCC 54/36 HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 6/1
7 (1) Current limit: 2 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 2 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 5: Compensation power dependent on the test voltage for type HVCC 1/ (1) Current limit: 2 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 2 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 6: Compensation power dependent on the test voltage for type HVCC 75/ (1) Current limit:2 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 3 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 7: Compensation power dependent on the test voltage for type HVCC 132/72 HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 7/1
8 (1) Current limit: 3 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 3 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 8: Compensation power dependent on the test voltage for type HVCC 14/ (1) Current limit: 3 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 3 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 9: Compensation power dependent on the test voltage for type HVCC 19/ (1) Current limit:4 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 4 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 1: Compensation power dependent on the test voltage for type HVCC 2/1 HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 8/1
9 Technical Data of Automatic HV Capacitive Compensation Unit Type designation HVCC a/b a = maximum compensation power in kvar at maximum operation voltage and a frequency of 5 Hz b = maximum operation voltage in kv Table 4: Technical data of automatic HV Capacitive Compensation Unit Type Auto- HVCC 54/42 Auto- HVCC 13/72 Auto- HVCC 2/1 Operation voltage (rms) (kv) Test voltage at power frequency (kv) Max. operation current (A) Operation frequency (Hz) 5 / 6 5 / 6 / 2 *2) 5 / 6 / 2 *2) at 5 Hz (kvar) at 6 Hz (kvar) Max. power graduation at 6 Hz (kvar) Losses (kw) Quantity of oil (l) Leakable oil (l) Compensation power dependent on test voltage See Fig. 11 See Fig. 12 See Fig. 13 Standard IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 IEC 6871; VDE Part 41 Interfaces for Control Operation voltage (V AC) 23/4 23/4 23/4 Operation current (A) max. 5 max. 5 max. 5 Air supply Rated air pressure (bar) Rated air flow rate (l/min) Dimensions, Environment Dimensions (LxWxH) (m) X 5.5 x x 15. x x 15. x 4.85 Weight (t) Installation Indoor, stationary Indoor, stationary Indoor, stationary Ambient temperature ( C) Height above sea level (m) Humidity (%) (no condensation) (no condensation) (no condensation) *2) In case of operation frequency of 2 Hz, the HV capacitive compensation unit can be used only at up to 55 % of the rated operation voltage. HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 9/1
10 Compensation Power ( kvar ) (1) Current limit: 2 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 2 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 11: Compensation power dependent on the test voltage for type Auto-HVCC 54/ (1) Current limit: 3 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz Test Voltage (kv) (Two-Phase Operation (4) Current limit: 3 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 12: Compensation power dependent on the test voltage for type Auto-HVCC 13/ Test Voltage (kv) (1) Current limit: 4 A (2) Operation frequency: 6 Hz (3) Operation frequency: 5 Hz (4) Current limit: 4 A (5) Operation frequency: 6 Hz (6) Operation frequency: 5 Hz Fig. 13: Compensation power dependent on the test voltage for type Auto-HVCC 2/1 HIGHVOLT Prüftechnik Dresden GmbH 217/ docx Subject to change without prior notice 1/1
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