TECHNICAL DATA TYPE CM2 VACUUM ON-LOAD TAP CHANGER FOR OIL-IMMERSED TRANSFORMER HM0.154.5701 SHANGHAI HUAMING POWER EQUIPMENT CO., LTD.

TYPE CM2 VACUUM ON-LOAD TAP CHANGER TECHNICAL DATA 1. General ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯3 2. Technical specification⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯4 3. Model designation ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯5 4. Terms and definitions ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯7 5. Special designs⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯10 6. Motor drive unit ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯12 7. Controllers for On-Load tap changer ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯13 8. OLTC accessories⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯13 9. Appendixes⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯14...

TYPE CM2 VACUUM ON-LOAD TAP CHANGER TECHNICAL DATA

1. General Type CM2 Vacuum On-Load Tap Changer (hereinafter referred as CM2 or CM2 OLTC) is a typical combined-structure tap changer applicable in oil-immersed transformer, comprising of two major parts: diverter switch and tap selector. The CM2 OLTC is put in transformer oil tank and its diverter switch has a separate oil compartment from transformer tank, while tap selector, together with transformer windings, is completely laid inside the tank. OLTC's installation is divided into two types - standard tank flange and bell-type flange. Three-phase CM2 OLTC could be used at neutral point of star-connection,...

(S>Hm2. Technical specification Type CM2 OLTC complies with IEC60214-1: 2003 standard, please refer to below table 1. TYPE CM2 VACUUM ON-LOAD TAP CHANGER TECHNICAL DATA Tabel CM2 Series OLTC Main Technical Specifications

3. Model designation 3.1 Model designation Type CM2 OLTC models varies with number of phase, maximum.rated through current, the highest voltage for equipment, insulation grade of tap selector and connection mode, etc.The parameters are represented as in Fig.2 below. CM2 III - 600 Y / 126 D - 10193W Basic connection diagram of tap selector Tap selector insulation grade Highest voltage for equipment Connection mode: Y for regulation at neutral point Max .rated through current Number of phase Type Fig.2 Designation of CM2 OLTC 3.2 Designation of basic connection of tap selector The tap selector...

TYPE CM2 VACUUM ON-LOAD TAP CHANGER TECHNICAL DATA Fig.4 Survey of Basic Connection Diagram of Tap Selector

4. Terms and definitions 4.1 Through current Rated through current ( Iu) : The current flowing through an on-load tap-changer towards the external circuit, which is capable of transferring from one tap to the other at the relevant rated step voltage and which can be carried continuously while meeting the requirements of the standard. Max. rated though-current (Ium): The highest rated through-current for which the tap-changer is designed for and which is the current reference for all related test. 4.2 Step voltage Rated step voltage (Ui): For each rated through-current, the max. permitted voltage...

4.5 Electrical life of vacuum interrupter The electrical life of vacuum interrupter is 600,000 operations. 4.6 Short-circuit current test According to IEC 60214-1: 2003, all contacts continuously carrying the current shall be able to withstand 2s (±10%) short circuit test current without melting, deformation or mechanical damage. Meanwhile the starting peak current value shall be 2.5 (±5%) times of the root means square value of rated short circuit test current. Refer the short circuit test current values to Table 1. CM2 Series of OLTC Main Technical Specifications. 4.7 Conditions for OLTC's...

2. With reversing switch 3. With coarse change-over selector Explanation of designation code: a: across regulation winding for the same phase a1: between any selected and preselected taps of the tap selector b: between any two taps of different phases a0: between any adjacent taps of diverter switch TYPE CM2 VACUUM ON-LOAD TAP CHANGER TECHNICAL DATA c1: between the beginning of coarse tap winding and neutral of fine tap winding of the same phase c2: between beginnings of coarse tap winding of different phases d: between begining and end of coarse tap winding of the same phase SF: spark gap

Table 2 CM2 OLTC internal Insulation (unit: kV) 4.10 Installation models Type CM2 OLTC is mounted onto the transformer cover by tap changer head, a mounting flange (see appendix) must be provided by transformer producer for connection. CM2 OLTC is suitable for either standard tank or bell-type mounting. For bell-type tank transformer, the OLTC support flange is supplied as a temporary support, OLTC will be secured onto transformer mounting flange after complete installation of transformer bell-tank. 5 Special designs 5.1 Potential connection of the tap winding For high voltage or wide regulation...

For calculating the change-over selector stress and dimensioning the tie-in resistors, the following details of the transformer specifications required when ordering: a) Complete transformer parameter: rated capacity, rated voltage, voltage regulating range, winding connection mode, insulation level and so on. b) Arrangement of the windings, i.e. the relative position of the tap winding to the adjacent coil or winding parts c) Operating A.C.voltage across windings or layers of windings adjacent to the tap windings d) Capacitance of the tap winding to adjacent windings(Cw) e) Capacitance of the...

OLTC Combination Delta Connection Delta Connection Delta Connection Fig.9 Connection Diagram for Multiple CM OLTC Applications 6. Motor drive unit CM2 OLTC may operated by SHM-III or CMA7 motor drive unit according to the requirement, please refer to Table 4 for technical data. Table 4 Technical Data of Motor Drive Unit Motor drive unit Rated power (W) TYPE CM2 VACUUM ON-LOAD TAP CHANGER TECHNICAL DATA Rated voltage (V) Motor Rate frequency(Hz) Rated torque on drive shaft (Nm) Revolution of the drive shaft per switching operation Revolution of the hand crank per switching operation Running time...