Current Transformer Secondary Overvoltage Protector-High Voltage Components-Zhejiang Tiankang Electronic Technology Co., Ltd

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 selection

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