Description
Overview of Capacitor Differential Voltage Protection
- The ASC-447H Digital Capacitor Differential Voltage Protection Unit applies to medium and low voltage shunt capacitor banks.
Protection Functions
- Three-stage overcurrent protection
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Capacitor differential voltage protection
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Zero-sequence overvoltage protection
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Overvoltage protection with no-current blocking option
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Undervoltage protection with current blocking option
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Phase-to-ground overvoltage protection with no-current blocking, judged by phase voltage
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Phase-to-ground undervoltage protection with current blocking, judged by phase voltage
Communication Functions
- Three communication modes available: RS-485, CANBUS and Ethernet. Please specify when placing orders.
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Upload real-time data including measurement data, fault recording data, fault and alarm signals, protection settings, configuration and parameters. Remote online setting modification and protection switching are supported.
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Receive upper commands for remote control, time synchronization, setting adjustment and data read-write.
Control Cabinet Functions
- Built-in anti-tripping control circuit
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Adaptive closing and tripping current
Self-diagnosis Functions
- Automatic fault detection of RAM, ROM, A/D module and power loss
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Automatic verification of settings, configuration and parameters
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Event Record & Fault Recording
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Record protection trips and device abnormalities
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Log protection type, operating time and operating parameters during trips
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Record trip time, protection type and effective values before and after faults
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Waveform storage: 2 cycles before fault and 4 cycles after fault per channel
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48 groups of SOE records and 16 groups of fault reports can be retained after power loss
Monitoring Functions
- Measure analog quantities such as current, voltage and frequency
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Collect status signals of circuit breaker, energy storage, isolating switch and local/remote mode
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Circuit breaker closing and tripping control
Display Functions
- Chinese LCD screen, status indicators and operation keypad equipped. Support real-time monitoring, online setting modification and protection switching. Fault indicators can be reset locally or remotely.
Setting List of Capacitor Bank Unbalance Voltage Protection（59NU/59N）
| No. | Display Name | Range | Step | Remark |
|---|---|---|---|---|
| 1 | Stage 1 Protection Setting | |||
| 1.1 | Stage 1 Protection Switch | 1/0 | 1: Enable, 0: Disable Stage 1 Overcurrent Protection | |
| 1.2 | Stage 1 Time Delay | 0～120.00s | 0.01s | |
| 1.3 | Stage 1 Setting Value | 0.40～99.99A
0.10～20.00A |
0.01A | Rated Current In=5A
Rated Current In=1A |
| 2 | Stage 2 Protection Setting | |||
| 2.1 | Stage 2 Protection Switch | 1/0 | 1: Enable, 0: Disable Stage 2 Overcurrent Protection | |
| 2.2 | Stage 2 Time Delay | 0～120.00s | 0.01s | |
| 2.3 | Stage 2 Setting Value | 0.40～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 3 | Stage 3 Protection Setting | |||
| 3.1 | Stage 3 Protection Switch | 1/0 | 1: Enable, 0: Disable Stage 3 Overcurrent Protection | |
| 3.2 | Stage 3 Time Delay | 0～120.00s | 0.01s | |
| 3.3 | Stage 3 Setting Value | 0.40～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 4 | Overvoltage Protection Setting | |||
| 4.1 | Overvoltage Protection Switch | 1/0 | 1: Enable, 0: Disable Overvoltage Protection | |
| 4.2 | Overvoltage Time Delay | 0～120.00s | 0.01s | |
| 4.3 | Overvoltage Setting Value | 5～120.00V | 0.01V | |
| 5 | Undervoltage Protection Setting | |||
| 5.1 | Undervoltage Protection Switch | 1/0 | 1: Enable, 0: Disable Undervoltage Protection | |
| 5.2 | Undervoltage Time Delay | 0～120.00s | 0.01s | |
| 5.3 | Undervoltage Setting Value | 5～100.00V | 0.01V | |
| 6 | Differential Voltage Protection Setting | |||
| 6.1 | Differential Voltage Protection Switch | 1/0 | 1: Enable, 0: Disable Differential Voltage Protection | |
| 6.2 | Differential Voltage Time Delay | 0～120.00s | 0.01s | |
| 6.3 | Differential Voltage Setting Value | 0.5～25V | 0.01V | |
| 7 | Zero-sequence Overvoltage Setting | |||
| 7.1 | Zero-sequence Overvoltage Protection Switch | 1/0 | 1: Enable, 0: Disable Zero-sequence Voltage Protection | |
| 7.2 | Zero Voltage Time Delay | 0～120.00s | 0.01s | |
| 7.3 | Zero Voltage Setting Value | 5～120.00V | 0.01V | |
| 8 | Phase-to-ground Undervoltage Setting | |||
| 8.1 | Phase-to-ground Undervoltage Switch | 1/0 | 1: Enable, 0: Disable Phase-to-ground Undervoltage Protection | |
| 8.2 | Undervoltage Time Delay | 0～120.00s | 0.01s | |
| 8.3 | Undervoltage Setting Value | 5～70.00V | 0.01V | |
| 9 | Phase-to-ground Overvoltage Setting | |||
| 9.1 | Phase-to-ground Overvoltage Switch | 1/0 | 1: Enable, 0: Disable Phase-to-ground Overvoltage Protection | |
| 9.2 | Overvoltage Time Delay | 0～120.00s | 0.01s | |
| 9.3 | Overvoltage Setting Value | 5～70.00V | 0.01V | |
| 10 | General Setting | |||
| 10.1 | Bus PT Broken Line Detection | 1/0 | 1: Enable, 0: Disable | |
| 10.2 | Control Circuit Broken Line Detection | 1/0 | 1: Enable, 0: Disable | |
| 10.3 | Current Blocking Over & Under Voltage | 1/0 | 1: Enable, 0: Disable | |
| 10.4 | 1A Rated Current Selection | 0.1～99.99A | 0.01A | 1: 1A rated, 0: 5A rated |
| 10.5 | Current Blocking Setting | 0.1～99.99A | 0.01A | Current blocking threshold value |
Outline and Installation Dimensions
FAQ
Q：How does capacitor differential voltage protection work?
A:It detects unbalanced voltage difference across capacitor banks and trips promptly once exceeding threshold to isolate faulty capacitors.
Q：What is the installation mode of capacitor differential voltage protection device?
A:The capacitor differential voltage protection device is generally mounted on switchgear or assembled into panels per project requirements.
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