Description
Overview of Protective Relays
- In power system and substation automation, capacitor bank protection relay is a widely applied type of relay protection product, and the ASC-441H digital capacitor protection and control unit is perfectly suited for medium- and low-voltage shunt compensation capacitor banks, acting as bay-level equipment for capacitor units.
Protection Features of Capacitor Protection Relay
- Three-stage definite time overcurrent protection
- Zero-sequence overcurrent protection
- Zero-sequence overvoltage protection
- Overvoltage protection (no-current interlock optional)
- Undervoltage protection (current presence interlock optional)
- Control circuit disconnection
- CT disconnection / Current transformer breakage
- Bus PT disconnection / Bus VT failure
- Ansi relay protection codes：50/51/50N/51N/59N/59/27/74/60
Communication Mode
- Optional: RS-485, CAN bus, Ethernet,IEC 61850 , IEC 60870-5-103
Main Functional Specifications
- Protection response time (including the response time of the output relay): Average error in response time: not more than 35 ms;
- Precision operating range: Minimum precision current: 0.08 In, Maximum precision current: 20 In
- Current setting error: When the current exceeds 1.00 A, the error shall not exceed ±2.5%; Voltage setting error: shall not exceed ±3%
- Measurement accuracy: Current (I)/Voltage (U): Class 0.2; Power (P)/Reactive power (Q): Class 0.5
- Remote signal resolution: no more than 2 ms
Event Logging, Fault Recording
- The recorded events include protective action events and device malfunctions;
- Record the type of protection trip, the time of the trip, and the operating parameters at the time of the trip;
- The fault recording data includes: the time of the protection operation, the type of protection operation, and the rms values before and after the recording was initiated;
- Data length of the fault recording: 2 cycles before the fault and 4 cycles after the fault;
- The SOE can retain 48 sets of data after a power loss, and the fault report can retain 16 sets of data after a power loss.
capacitor bank protection relay application
- The capacitor protection and relay unit provides real-time monitoring of voltage, current, temperature, and unbalance. By guarding against overvoltage, overcurrent, and internal faults, it ensures the reliability of reactive power compensation equipment within the power system.
Protective Relay Setting Document
| No. | Display Name | Range | Step | Remarks |
|---|---|---|---|---|
| 1 | Stage 1 Protection Setting | |||
| 1.1 | Stage 1 Protection Enable/Disable | 1/0 | — | Stage 1 protection: Enable(1) / Disable(0) |
| 1.2 | Stage 1 Time Delay | 0.00～120.00s | 0.01s | |
| 1.3 | Stage 1 Setting Value | 0.40～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 2 | Stage 2 Protection Setting | |||
| 2.1 | Stage 2 Protection Enable/Disable | 1/0 | — | Stage 2 protection: Enable(1) / Disable(0) |
| 2.2 | Stage 2 Time Delay | 0.00～120.00s | 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 Enable/Disable | 1/0 | — | Stage 3 protection: Enable(1) / Disable(0) |
| 3.2 | Stage 3 Time Delay | 0.00～120.00s | 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 Enable/Disable | 1/0 | — | Overvoltage protection: Enable(1) / Disable(0) |
| 4.2 | Overvoltage Time Delay | 0.00～120.00s | 0.01s | |
| 4.3 | Overvoltage Setting Value | 5.00～120.00V | 0.01V | |
| 5 | Undervoltage Protection Setting | |||
| 5.1 | Undervoltage Protection Enable/Disable | 1/0 | — | Undervoltage protection: Enable(1) / Disable(0) |
| 5.2 | Undervoltage Time Delay | 0.00～120.00s | 0.01s | |
| 5.3 | Undervoltage Setting Value | 5.00～100.00V | 0.01V | |
| 6 | Zero-sequence Overcurrent Setting | |||
| 6.1 | Zero-sequence Overcurrent Protection | 1/0 | — | Zero-sequence overcurrent protection: Enable(1) / Disable(0) |
| 6.2 | Zero Current Time Delay | 0.00～120.00s | 0.01s | |
| 6.3 | Zero Current Setting Value | 0.02～5.00A
0.50～99.00A |
0.01A | Small current grounding system
380V three-phase four-wire single-phase grounding system |
| 7 | Zero-sequence Overvoltage Setting | |||
| 7.1 | Zero-sequence Overvoltage Protection | 1/0 | — | Zero-sequence overvoltage protection: Enable(1) / Disable(0) |
| 7.2 | Zero Voltage Time Delay | 0.00～120.00s | 0.01s | |
| 7.3 | Zero Voltage Setting Value | 0.00～120.00V | 0.01V | |
| 8 | Phase-to-Ground Undervoltage Setting | |||
| 8.1 | Phase-to-Ground Undervoltage Enable/Disable | 1/0 | — | Phase-to-ground undervoltage protection: Enable(1) / Disable(0) |
| 8.2 | Undervoltage Time Delay | 0.00～120.00s | 0.01s | |
| 8.3 | Undervoltage Setting Value | 5.00～70.00V | 0.01V | |
| 9 | Phase-to-Ground Overvoltage Setting | |||
| 9.1 | Phase-to-Ground Overvoltage Enable/Disable | 1/0 | — | Phase-to-ground overvoltage protection: Enable(1) / Disable(0) |
| 9.2 | Overvoltage Time Delay | 0.00～120.00s | 0.01s | |
| 9.3 | Overvoltage Setting Value | 5.00～70.00V | 0.01V | |
| 10 | CT Break Setting | |||
| 10.1 | CT Break | 1/0 | — | CT break alarm: Enable(1) / Disable(0) |
| 10.2 | CT Break Setting Value | 0.10～5.00A | 0.01A | |
| 10.3 | CT Break Time Delay | 1.00～999.99s | 0.01s | |
| 10.4 | Load Current Setting Value | 0.05～5.00A | 0.01A | |
| 11 | General Setting | |||
| 11.1 | Bus PT Break | 1/0 | — | Bus PT break detection: Enable(1) / Disable(0) |
| 11.2 | Control Circuit Break | 1/0 | — | Control circuit break: Enable(1) / Disable(0) |
| 11.3 | Current Blocking Over/Undervoltage | 1/0 | — | Current blocking over & undervoltage protection: Enable(1) / Disable(0) |
| 11.4 | Current Rated 1A | 1/0 | — | Enable(1)=1A / Disable(0)=5A |
| 11.5 | B17 as Maintenance Plate | 1/0 | — | B17 maintenance plate: Enable(1) / Disable(0) |
| 11.6 | Integral Energy Calculation | 1/0 | — | Calculate integral energy(1) / Not calculate(0) |
| 11.7 | Harmonic Component Calculation | 1/0 | — | Calculate harmonic component(1) / Not calculate(0) |
| 11.8 | Current Blocking Value | 0.00～99.99A | 0.01A | Current blocking setting value |
| 11.9 | Sudden Change Startup | 0.00～99.99A | 0.01A |
Outline and Installation Dimensions of Capacitor Bank Protection Relay
FAQ
Q：What is the difference between a feeder protection relay and a capacitor protection relay?
A:Feeder protection relays are mainly applied to line feeders with three-stage current protection as their core relay protection function. As professional capacitor bank unbalance protection relay devices, capacitor bank protection relays adopt complete relay protection configurations; besides three-stage current protection, they also feature overvoltage protection, undervoltage protection and unbalance current protection for capacitor banks.
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