LOPS for MV Bus Overvoltage Protection

The LOPS low-voltage bus overvoltage suppression device is directly connected in parallel to the bus, using technologies such as fast controllers, high-energy nonlinear resistors, overvoltage peak interceptors, and counterattack suppression. It is scientifically calculated and finely designed. LOPS fully utilizes the excellent volt ampere characteristics, huge thermal capacity, and fast response speed of overvoltage interceptors, nonlinear resistors, and counterattack suppression equipment. Generally, setting the action value of LOPS at 1.2 times the system phase voltage (customizable in special cases) can achieve good results during operation.

LOPS is directly connected in parallel to the busbar, using technologies such as fast controllers, high-energy nonlinear resistors, overvoltage peak interceptors, and counterattack suppression. It is scientifically calculated and finely designed. LOPS compensates for deficiencies such as SPD, combined overvoltage protection, and resistance capacitance absorption, completely solving the problem of overvoltage on the medium voltage main busbar.

product details

Functional features

• High energy nonlinear resistor chip matching technology

The nonlinear resistor adopts unique heat dissipation technology and fully sealed process, with excellent heat dissipation and moisture prevention effects, stable working performance, long service life, and safety and reliability.

• Overvoltage peak cutting technology

When a transient overvoltage occurs in the system, when the peak value of the overvoltage exceeds 1.2 times the rated voltage peak value, the overvoltage peak interceptor immediately acts to cut off the high voltage wave head, ensuring the safe operation of various load equipment under the busbar.

• Secondary pressure limiting technology

After the operation of the first level voltage limiting unit, if the bus voltage still exceeds the set allowable value, the LOPS equipment will put in an overvoltage chopper to quickly limit the bus voltage to 1.2 times or less

• Rapid response technology

The action delay is small, the first level has no delay response, and the second level responds within 2 milliseconds.Good steep wave response characteristics, short conduction time of nonlinear resistors, active protection, and good protection performance

• Overvoltage recording technology

The LOPS low-voltage bus overvoltage suppression equipment can automatically record parameters such as the number of actions, action time, and bus voltage during action, providing a basis for system technical analysis

products specification

NO.	Spec		Arrestor	TBP	LOPS
1	Action voltage		2~3 times	2~3 times	1.25 times
2	Residual voltage		4~6 times	3 times	1.35 times
3	Withstand energy	6kV	75A/2ms;40kA/10μs;＜15kJ	400A/2ms;40kA/10μs;＜15kJ	1kA/2ms; 600kA/10μs; ≥1MJ
		10kV	75A/2ms;40kA/10μs;＜20kJ	400A/2ms;40kA/10μs;＜20kJ	2kA/2ms; 1MA/10μs; ≥ 2MJ
		35kV	400A/2ms;65kA/10μs;＜60kJ	400A/2ms;65kA/10μs;＜60kJ	10kA/2ms;2MA/10μs; ≥ 75MJ
4	Risk		Unknown status, explode	Unknown status, explode	Controllable operation status without explosion
5	Response time		≤50ns	≤50ns	≤50ns
6	Leakage current		≤1mA	≤1mA	≤1mA
7	Effectiveness		Lightning overvoltage switching overvoltage	switching overvoltage Resonance overvoltage	All overvoltage