1. Overview
HXGN-12 AC unit metal-enclosed switchgear (hereinafter referred to as the unit cabinet), is new generation high-voltage electrical product designed and developed by Dongmeng Company based on the introduction of foreign advanced technology and in accordance with the requirements of domestic rural power network reconstruction, its performance indicators have all reached IEC298 and GB3906 standards after rigorous type testing and assessment of long-term test run. The main switch, operating mechanism and components of the unit cabinet adopts Dongmeng Company VS1 vacuum switch. The cabinet is riveted with imported aluminum-coated zinc plate after CNC machining, protection grade is IP3X, with a reliable mechanical interlock and anti-maloperation functions. This product features small volume, light weight, beautiful appearance, easy operation, long life, high parameter, non pollution, less maintenance, etc.
2. Applications
HXGN-12 AC unit metal-enclosed switchgear is used as receiving and distribution of electric energy in power system with AC 50HZ and 12KV.
3. Service conditions
A. The altitude does not exceed ：1000m
B. ambient air temperature: upper limit＋40℃
lower limit－25℃
C. relative humidity: daily average not more than 95％
monthly average not more than 90％
D. ambient air is not contaminated by corrosive or flammable gases, water vapor, etc.;
E. no recurrent severe vibration.
4. Model and its implication
5. Standards
GB311.1-1997 Insulation coordination of high voltage power transmission and transformation equipment
GB1985-1989 AC high voltage isolating switch and earthing switch
GB3804-1990 AC high voltage load switch
GB3309-1989 High-voltage switchgear mechanical test at room temperature
GB3906-1991 3－35kV AC metal-enclosed switchgear
GB/T11022-1999 Common technical requirements for high-voltage switchgear and control equipment standards
GB/T13384-1992 General technical conditions for mechanical and electrical products packaging
GB/T16926-1997 AC high voltage load switch – fuse-combination unit
GB/T16927.1-1997 High voltage test techniques
DL/T404-1997 Ordering technical conditions for Indoor AC high voltage switchgear
DL/T593-1996 General technical guidelines for ordering of the high-voltage switchgear
EC 420 ：1990 High voltage AC load switch – fuse-combination unit
6?Parameters
6.1 unit cabinet
No |
Name |
Unit |
Data | ||
|
1 |
Rated voltage |
kV |
12 | ||
|
2 |
Main busbar rated current |
A |
630 | ||
|
3 |
Rated current |
A |
630 | ||
|
4 |
Rated frequency |
Hz |
50 | ||
|
5 |
Rated short-time withstand current |
kA |
25 | ||
|
6 |
Rated duration of short circuit |
s |
3 | ||
|
7 |
Rated peak withstand current |
kA |
63 | ||
|
8 |
Rated short-circuit making current |
kA |
63 | ||
|
9 |
Rated active load breaking current |
A |
630 | ||
|
10 |
Rated closed-loop breaking current |
A |
630 | ||
|
11 |
Rated cable charging breaking current |
A |
10 | ||
|
12 |
Rated insulation level |
Rated lightning impulse withstand voltage (peak) |
phase to phase, phase to earth |
kV |
75 |
|
open contacts |
85 | ||||
|
1min power frequency withstand voltage (RMS) |
phase to phase, phase to earth |
42 | |||
|
open contacts |
48 | ||||
|
13 |
Main circuit resistance |
μΩ |
≤400 | ||
|
14 |
Mechanical life (load switch) |
次 |
5000 | ||
|
Mechanical life (grounding switch) |
2000 | ||||
|
15 |
1min power frequency withstand voltage of auxiliary circuit |
kV |
2 | ||
|
16 |
Rated SF6 gas pressure (20 ℃ gauge pressure) |
MPa |
0.045 | ||
|
17 |
Protection class |
|
IP3X | ||
6.2High-voltage current-limiting fuse performance parameters as shown in the table
Type |
Rated voltage |
Rated current of the fuse |
Rate current of the fuse-link |
Rated breaking current |
|
XRNT |
12KV |
40 |
6.3，10，16，20，25，31.5，40 |
31.5 |
|
XRNT |
100 |
50，63，71，80，100 |
31.5 | |
|
XRNT |
125 |
125 |
31.5 |
6.3Arrester performance parameter table
Type |
Rated voltage |
System operating voltage |
DC 1mA reference voltage |
Discharge current residual voltage |
|
HY5WZ－17/50 |
17KV |
11.5KV |
Not less than24 |
50KV |
6.4 Overview of the overall structure
6.4.1 Ring Main Unit (RMU) is composed of the enclosure, vacuum switch, grounding switch, instrument cubicle, bus and other electrical components and auxiliary components, the load switch arranged in the middle and upper part of the enclosure that is assembled from aluminized zinc plate after flanging and bending.
6.4.2 RMU three-phase is longitudinal structure arrangement, convenient for three-phase bus connection between the cabinets.
6.4.3 Instrument cubicle is located on the upper part of the RMU, in which the ammeter, voltmeter, switches, indicator lights and other components can be installed, at the bottom of which the terminal board for secondary circuit can be installed.