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Transfer switching equipment
WHKMAS-12
The WHKMAS-12 medium-voltage transfer switch equipment and complete set of devices adopt a metal-armored, middle-mounted structure. It consists of one medium-voltage transfer switch cabinet and one control cabinet, equipped with WHKMVTB-12 medium-voltage automatic transfer switch equipment, BA-ⅢH intelligent controller, and other components, to achieve power conversion, protection and other functions between two power sources.
Product Details
Model and Meaning
Technical Specifications
Appearance and dimensions
Other
WHKMAS-12 medium-voltage transfer switch appliances and complete sets of equipment adopt a metal armored mid-mounted structure, consisting of a medium-voltage transfer switch cabinet and a control cabinet, equipped with WHKMVTB-12 medium-voltage automatic transfer switch appliances, BA-ⅢH intelligent controller and other components to realize two-way power conversion, protection and other functions.
| WHK | MAS | — | ☐ | / | ☐ | / | ☐ | + | ☐ |
|---|---|---|---|---|---|---|---|---|---|
| Enterprise code | Product series code | Rated operating voltage | Rated operating current | Breaking current | Controller | ||||
|
Wuxi Hanguang Electric Company Limited |
Medium voltage transfer switch Electrical appliances and complete sets of equipment |
12kV | 1250A | 31.5 kA | BA-Ⅲ H |
| Serial number | Name | Units | Numerical value |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated current | A | 1250 |
| 3 | Rated frequency | Hz | 50 |
| 4 | Rated short-time power frequency withstand voltage | kV | 42 |
| 5 | Rated lightning impulse withstand voltage | 75 | |
| 6 | Rated short-time power frequency withstand voltage (fracture) | 48 | |
| 7 | Rated lightning impulse withstand voltage (fracture) | 85 | |
| 8 | Rated short-time withstand current | kA | 31.5 |
| 9 | Rated Peak Withstand Current | 80 | |
| 10 | Rated short-term withstand current (ground connection loop) | 27.4 | |
| 11 | Rated Peak Withstand Current (Ground Connection Loop) | 69.6 | |
| 12 | Rated short circuit breaking current | 31.5 | |
| 13 | Rated short-circuit closing current | 80 | |
| 14 | Short Circuit Duration | s | 4 |
| 15 | Minimum opening time | ms | 20 |
| 16 | Transition time | ≤200 | |
| 17 | DC component | % | 52 |
| 18 | Rated cable charging opening and closing current | A | 25 |
| 19 | Heavy breakdown level during capacitive current opening and closing | C2 | |
| 20 | Electrical Life Class (Automatic Reclosing) | E2 | |
| 21 | Mechanical life rating | M2 | |
| 22 | Electrical Life | Time | 10000 |
| 23 | Mechanical life | Time | 16000 |
| 24 | Conversion ability level | RC-4A | |
| 25 | Rated operating sequence | Automatic reclosing: open-0.3 s-close opening-180s-close opening |
(BA-IIH)
Working Principle
When a deviation (i.e., an abnormal change in power supply voltage or frequency) is detected in the common power supply, the medium voltage transfer switch appliance automatically switches the load from the common power supply to the standby power supply: if the common power supply returns to normal, it automatically returns the load to the common power supply.
Between 85% and 110% of the rated power supply voltage U, if the AC frequency is the rated frequency, it should be able to work normally.
Note 1: The conversion may have a predetermined delay or no delay, and may have a power-off position.
Note 2: When there are two power supplies, common power supply and standby power supply, the medium voltage transfer switch needs to specify a common power supply position.
When the two power supplies are backup power supplies for each other, they can also act according to the operation procedure required by the user.
Performance and Features
◆ Basic Functions
It has the functions of over-voltage, under-voltage, over-frequency, under-frequency, over-current, phase loss and reverse phase sequence.
◆ Man-machine operation interface
LCD display, LED indication, key operation, adjustable parameters, multiple languages (Simplified Chinese, English, others).
◆ Communication function
Hardware RS485 communication interface and other types of communication methods realize four remote functions.
◆ Step by step switching function
BA-Ⅲ H monitors the state (closed/open position) of the multi-channel load switch appliance at the lower stage of the medium voltage automatic transfer switch appliance, and gradually adds the load after the medium voltage automatic transfer switch appliance is switched to the standby power supply according to the settable program to prevent excessive inrush current; And the medium-voltage automatic transfer switch appliance gradually disconnects the switch appliance of each load before disconnecting the standby power supply, so as to facilitate the smooth transition of the power supply current, the process is as follows:
1) Under no-load conditions, when BA-Ⅲ H detects the deviation of the common power supply, BA-Ⅲ H issues action instructions in turn as follows:
A) issuing a command to disconnect the load-side switch appliance;
b) sending a command to disconnect the switching electrical appliance on the common power supply side;
C) Then sending a command to close the standby power supply side switch electrical appliance; d) Finally, the instruction is issued to close the switchgear on the load side step by step.
2) The operation sequence after the common power supply is restored is:
A) disconnecting the load-side switching appliance;
b) disconnecting the standby power side switch appliance;
c) Close the commonly used power side switch appliances;
d) Turn on the load side switch appliances step by step.
It can realize the step-by-step switching control of up to 24 load switch appliances, the step-by-step switching interval is adjustable, and the priority of each load switch can be flexibly set.
◆ PT disconnection detection function
When the secondary circuit of voltage transformer (PT) is disconnected, BA-Ⅲ H shall send out a disconnection alarm signal; Self-fault lock, alarm, can't issue action command.
PT disconnection alarm value and return value can be set according to customer needs or actual working conditions.
Outline and installation dimensions (unit: mm)
