Type HWV Externally-mounted Vacuum OLTC Technical data HM0.154.5002-01.06/2014 SHANGHAI HUAMING POWER EQUIPMENT CO., LTD.

TYPE HWV EXTERNALLY-MOUNTED VACUUM OLTC TECGNICAL DATA 1. General⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯2 2. Technical specification⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯3 3. OLTC structure⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯7 4. Type designation⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯9 5. Service condition⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯10 6. Voltage regulation mode⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯10 7. Motor drive unit ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11 8. Operation controller⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯12 9. Installation method⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯13...

1. General Type HWV externally-mounted vacuum on-load tap changer (Hereafter, referred to as OLTC) is of combined structure. It provides the following features: All parts of Type HWV OLTC including tap selector is installed in an independent oil chamber which is completely separated from the transformer main tank, no oil and gas exchange. The tap changer oil chamber is fixed at the side of transformer oil tank, while motor drive unit as a part of tap changer is integrated with tap changer oil chamber at one side; It uses vacuum interrupters as arcing contacts. As the arcing generated from the...

Table 1 Type HWV OLTC technical data 2.2 Rated through-current Rated through current lu: The current flow through an on-load tap changer toward the external circuit, which can transfer from one tap to the other at the relevant rated step voltage and which can be carried continuously while meeting the requirement. Maximum rated through current Ium: The highest rated through current for which the tap changer is designed for and which forms the basis for all current related tests. In the selection, Iu<Ium. TYPE HWV EXTERNALLY-MOUNTED VACUUM OLTC TECGNICAL DATA 2.3 Rated step voltage Rated step voltage...

Rated step voltage Ui: For each value of rated through current, the highest permissible voltage. Maximum rated step voltage Uim: The highest value of the rated step voltage for which the tap changer is designed. In the selection, Ui≤Uim. The maximum rated step voltage for type HWV OLTC is 3300V. 2.4 Rated step capacity Pstn Step capacity is the product of step voltage and load current, that is Ps=UI. Rated step capacity is the maximum permissible step capacity for the tap changer under continuous working condition, that is PStN=Iux×Ui (Lower load point) and Pstn=Iu×Uim (Upper load point) in the...

2.7 Tap changer insulation level to earth Type HWV Tap changer insulation level to earth is the insulation between tap changer live parts and grounding part. It is decided by rated separate source AC withstand voltage (1 min) and rated lightning impulse withstand voltage. The requirement of which correlates to the transformer tap winding location, regulation range & regulation method, winding connection & arrangement and rated voltage of transformer winding. It's decided by the insulation to earth of transformer tap winding. Tap changer insulation level is decribed by the highest voltage for...

Linear Regulation Reversing Regulation TYPE HWV EXTERNALLY-MOUNTED VACUUM OLTC TECGNICAL DATA Coarse/Fine Regulation Internal insulation of diverter switch a: between start and end of a fine tap winding; also between start and end of coarse tap winding; b: between any tapping of different fine tap windings, or between ends of different coarse windings; a0: between selected and preset diverter switch tapping; a1: between any selected and preselected taps of the tap selector (Connected or unconnected); c1: between the start of coarse tap winding and the current take-off terminal for the same phase;...

3 OLTC structure Type HWV tap changer is composed of three parts: oil compartment and its accessories, tap changer body and motor drive unit, as shown in Fig. 3. Motor drive unit 3.1 Tap changer body Tap changer body is composed of three parts: tap selector, diverter switch and drive unit. (See Fig. 4) TYPE HWV EXTERNALLY-MOUNTED VACUUM OLTC TECGNICAL DATA Diverter switch Drive unit

3.2 Oil compartment and its accessories 3.2.1 Standard type oil compartment and its accessories Standard type oil compartment means tap changer oil compartment is connected with one independent oil conservator and separated from the oil in the transformer. The accessories mainly include pressure release valve, protective relay, rupture disk, oil filling pipe, oil outlet valve. (See Fig. 5) Tap changer oil compartment is always filled with oil. The tap changer oil compartment can be fixed with one side of transformer oil tank by bolts or directly welding with one side of transformer oil tank....

3.3 Motor drive unit Type HWV OLTC is equipped with new model motor drive unit (SHM-DA). 4. Type designation 4.1 Model designation Due to the different combinations of number of phases, maximum rated through current, the highest voltage for equipment and connections, type HWV comes with various models. Hence, the type designation shall provide all the above technical parameter and below is its detailed explanation in Fig. 7. HWV III - 400 Y/72.5-10193W Basic connection diagram of tap selector Highest voltage for equipment (KV) Connection mode (Y/D) Max. rated through current(A) Number of phases...

5 Service condition 5.1 Service temperature range of tap changer in oil is -25℃～ 105℃ . 5.2 Service ambient air temperature range of tap changer is -25℃～ 40℃ . 5.3 There shall be no serious dust, explosive gas or corrosive gas on service site. Remark: Please contact us if special application required. 6. Voltage regulation mode Tap changer can be used for any selectable winding connections for a three-phase D connection transformer and Y connection at neutral point. The basic voltage regulation mode includes three models: linear regualtion without change-over selector; reversing regulation with...

mwm_7. Motor drive unit Type HWV OLTC is driven by SHM-DA motor drive unt. Please refer to Table 4 for technical data. Table 4. Table 4 Technical Data of Motor Drive Unit TYPE HWV EXTERNALLY-MOUNTED VACUUM OLTC TECGNICAL DATA