Current Transformer Secondary Overvoltage Protector
scope of application
Current transformer secondary overvoltage protector is mainly suitable for differential winding, overcurrent winding, measurement winding, bus protection winding and backup winding of CT secondary side. It is used to inhibit transient overvoltage below impact overvoltage of the equipment and discharge surge energy, so as to protect the system circuit and equipment.
Normal service conditions and installation conditions
1. Normal service conditions
a.Voltage: The voltage continuously applied between the voltage protector terminals shall not exceed its maximum
Large continuous operating voltage.
b.Ambient temperature: -20℃ ~70℃.
c.Ambient humidity used: <95%RH.
d.Housing protection level: IP20.
e.Pollution level: The pollution level at the installation site is level 2.
2. Installation conditions
a.Installation category: according to the voltage protection level of the overvoltage protection device is divided into two categories;
b.installation site:
Qualification
| Power Supply Voltage | The AC-DC input is 100-240V |
| Normal leakage current IL20V | ≤1μ A |
| input resistance | ＞100M |
| break-over voltage | > 150v (can be set by user request) |
| Guide time | 50ms≤Ｔs≤250ms |
| Protective relay contact capacity | AC220V/5A |
| Use CT specifications | The secondary-side peak is greater than 150V |
| Protect the current | 5A |
| work environment | Temperature: -20℃ ~ + 70℃ Humidity: 95%RH |
| Compound way | Manual button reset |
| Seismic performance | 10-50-10HZ 2g 3min |
| Reliable safety | Compliance with IEC834-1 requirements |
| working power supply | AC220V,50HZ |
| Work, consumption | ≤5W |
| way to install | Track type |
1. Recommended for less-exposed sites;
2. It shall be installed without significant vibration and impact.
3. Installation method: use TH35-7.5 type rail for installation.
4. Wiring mode: screw pressing wiring.
Appearance and installation size
Overall size: 115 * 90 * 40 (length * width * depth) (CTB-6) unit: mm
Installation method: guide rail installation
See the terminal definition below: (CTB-3)
See the terminal definition below: (CTB-4)
See the terminal definition in the figure below: (CTB-6)
See Figure below: (CTB-9) Size: 145 * 90 * 40 (length * width * depth) (CTB-9) unit: mm
See the terminal definition in the following figure: (CTB-12) Overall size: 155 * 110 * 72 (length * width * depth) (CTB-12) unit: mm
Application
|
product name |
product model |
basic function |
remarks |
|
|
Secondary overvoltage protector |
NLK-CTB-3 |
|
Three-way current transformer secondary overvoltage protector |
Length, * width, * depth, 115mm * 90mm * 40mm |
|
NLK-CTB-4 |
Two-way current transformer secondary overvoltage protector |
Length, * width, * depth, 115mm * 90mm * 40mm |
||
|
NLK-CTB-6 |
Six-way current transformer secondary overvoltage protector |
Length, * width, * depth, 115mm * 90mm * 40mm |
||
|
NLK-CTB-9 |
Nine-way current transformer secondary overvoltage protector |
Length, * width, * depth, 145mm * 90mm * 40mm |
||
|
NLK-CTB-12 |
The 12-way current transformer secondary overvoltage protector |
Length, * width, * depth, 155mm * 110mm * 72mm |
||
