High voltage vacuum circuit breaker
Real photograph show
Detailed description
1. General
1.1 Name and model
ZN39-40.5C/D(T) serial indoor high-voltage vacuum circuit breaker.
1.2 Main application, use range and site condition
ZN39-40.5C/D(T) serial indoor high-voltage vacuum circuit breaker is of indoor high-voltage distribution device with technical parameter as 3ph, 50Hz and rated voltage of 40.5kV, which is mainly applicable for JYN1-35 type movable AC metal closed switch device and its renovation. That it can be used in acceptance, control and protection of electric energy from industrial company, power plant and distribution, especially for the site where frequently operation is needed.
1.3 Normal operation condition
a. Atmosphere temperature
upper limit +40ºC
lower limit -10ºC
b. altitude
a.s.l no more than 1000m.
c. humidity
Relative humidity: the average value per day no more than 95%, 90% per month.
Saturated vapor pressure: the average value per day no more than 1.2×10-3MPA, 1.8×10-3MPa per month.
d. others un-noted should conformity with requirements of d, e, f, g of item 3.1 of GB11022-1989.
1.4 Outlook drawing can be seen Pic. 1, Pic. 2, Pic. 3 and Pic. 4.
2. Technical parameter
2.1 Main technical parameter can be seen in sheet 1.
2.2 Main mechanical parameter can be seen in sheet 2.
3 Structure and working principle
3.1 Structure
Structure of ZN39-40.5C/T type breaker can be seen Pic. 1 and Pic. 2, and ZN39-40.5C/D type can be seen Pic. 3 and Pic. 4. Both the breaker are of hand trolley type which can be put into movable AC metal closed switch cabinet of JYN1-35 and GBC-35 type, and it can be used separately as well. Each vacuum interrupter was supported by 3 pcs of insulator to get stable structure and easy installation. Electro-magnetic operation mechanism is of CD10-11 type, spring operation mechanism is of CT19BN-1 type.
3.2 Inter-lock system can be seen in Pic. 1, Pic. 2, Pic. 3 and Pic. 4
The breaker can not be closed when the hand trolley was located between working position and test position where the lock pin did not insert the location hole on hand mechanism (no. 24 on the pic.). Operate the hand mechanism (no. 24 on the pic.) to make bend arm on components of no. of 19 to be integrated with cabinet when the hand trolley comes to test position or working position, then the breaker will be locked by inter-lock device after breaker closing, so, the tripping of breaking because of mis-operate the hand trolley under closing can be avoided. For emergency, the hand mechanism (no. 24 on the pic.) can be operated to release lock from lock pin, that the breaker can be tripped.
Sheet 1 Main technical parameter
| S/N |
Parameter |
Unit |
Value |
| 1 |
Rated voltage |
kV |
40.5 |
| 2 |
Rated current |
A |
1250, 1600, 2000 |
| 3 |
Rated frequency |
Hz |
50 |
| 4 |
Rated short-circuit breaking current |
kA |
20, 25, 31.5 |
| 5 |
Rated short-circuit closing current |
kA |
50, 63, 80 |
| 6 |
Rated peak withstand current |
kA |
50, 63, 80 |
| 7 |
Rated short time withstand current |
kA |
20, 25, 31.5 |
| 8 |
Rated short time continue |
S |
4 |
| 9 |
Rated operation order |
O-0.5s-CO-180s-CO |
| 10 |
Rated breaking current of single capacitor |
A |
400 |
| 11 |
Rated breaking current of back-to-back capacitor |
A |
400 |
| 12 |
Rated closing inrush of capacitor (frequency≤1000Hz) |
kA |
8.0 |
| 13 |
Short-circuit breaking current under different phase ground fault |
kA |
17.4, 21.75, 27.4 |
| 14 |
DC component percentage of short-circuit test on output side |
|
40% |
| 15 |
Rated insulation level |
1min power frequency |
Ground, pole |
kV |
95 |
| Withstand voltage |
Gap |
kV |
95 |
| Lighting shock |
Ground, pole |
kV |
185 |
| Withstand voltage |
Gap |
kV |
185 |
| 16 |
Breaking time |
ms |
≤80 |
| 17 |
Mechanical life |
times |
10000 |
| 18 |
Breaking times under rated short-circuit breaking current |
times |
12 |
| 19 |
Arcing time |
ms |
15≤ |
3.3 Arc-control principle
The average free stroke of gas molecular is large in vacuum that the gas is hard liberation. Insulation strength of vacuum is much higher than of atmosphere, when the switch opening, the arc will be appeared between contact, and the surface of contact will generate metal vapor under high temperature. Where magnet field will be occurred when current passing through it because of special phase on the design of contact. The arc will go fast along tangential direction of contact surface with the force from this magnet field. The result is, there are some metal vapor on the shield cover, that the arc will be extinguished when it pass through zero and the dielectric strength between contact will be back quickly.
Sheet 2 Mechanical parameter
| S/N |
Parameter |
Unit |
Value |
| 1 |
Contact open distance |
mm |
22±2 |
| 2 |
Contact stroke |
mm |
6±1 |
| 3 |
Allowable contact abrasion thickness |
mm |
≤3 |
| 4 |
Average closing speed |
m/s |
0.6±0.2 |
| 5 |
Average open speed |
m/s |
1.6±0.3 |
| 6 |
Contact closing elastic time |
ms |
≤5 |
| 7 |
Contact closing asynchronous |
ms |
≤2 |
| 8 |
Contact open asynchronous |
ms |
≤2 |
| 9 |
Open contact re-bound value |
mm |
≤2 |
| 10 |
Closing time |
ms |
30≤t≤100 |
| 11 |
Open time |
ms |
30≤t≤60 |
| 12 |
C - O time |
ms |
≤90 |
| 13 |
Main circuit resistance |
μ Ω |
≤80 |
| 14 |
Buffer distance |
mm |
10-2 |
4. Transport, acceptance and storage
During transportation, the VCB can not be turn-over, great shake or raining.
The user should do the following work and pay attention to the items when VCB arrived.
4.1 Check to find if package is damage or damp.
4.2 Open the box to pick up packing list, and to find if attached documents are complete or not.
4.3 Check to find the technical parameter on the name plate of VCB conformity with order requirements.
4.4 The conduct surface should be painted with industrial Vaseline and cover the insulate parts with clean oil paper when the VCB are left for a long time.
4.5 The VCB should be stored indoor of dry and ventilation.
5. Installation
5.1 Inspect before installation
Open the box of VCB to check nameplate, certification, packing list and so on is complete, the equipment is totally conformity with order requirements. Clean the surface dust or dirt, then, take 75kV/min power frequency of frequency withstand method to check the gap, the pole, the ground to find no continue flashover, discharging.
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