Transformer Neutral Point Protection Device

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1. Product Overview
The BTK-126kV/252kV transformer neutral point protection device mainly comprises the neutral point disconnector, discharge gap protector, zinc oxide lightning arrester, and current transformer. It plays a protective role when there is lightning overvoltage, operation overvoltage and temporary overvoltage in the transformer neutral point.

To facilitate equipment layout, we can design and produce extra T-shaped or gate type bracket to assemble various parts of the transformer neutral point protection device together.

2. Features
a. Fast and convenient to assemble;
b. The rod gap device is a separate part. It is made of stainless steel and the gap distance is easy to adjust;
c. After the user specifies the model of arrestor and current transformer, installation holes will be correctly reserved;
d. The adopted hot dip galvanized steel bracket is strong and anti-corrosion;
e. The CS17IV manual mechanism is adopted. It is equipped with a stainless steel case. The whole structure has good sealing performance as well as strong resistance to water, dust, and rust. The new type DSW4 electromagnetic lock can be configured.
f. The CJTKB electric mechanism is used. With a stainless steel case, it is beautiful in appearance, dustproof, waterproof, and anti-corrosion. It can meet the requirements of interlocking. The secondary components are of high quality and from domestic famous enterprises or joint ventures.

Transformer Neutral Point Protection Device

3. Technical Parameters
a. Transformer Neutral Point Rod Gap

Gap rated voltage (kV)	System rated voltage (kV)	Electrode gap range (mm)	Power frequency discharge voltage range (mm)	Insulator creepage distance (mm)	Transformer capacity (VA)	Antifouling level	Electrodes form
63	126	90-135	50-63	1813	20	Ⅲ	Hemispherical
63	126	90-135	50-63	2248	20	Ⅳ	Hemispherical
126	252	280-330	100-127	3150	20	Ⅲ	Hemispherical
126	252	280-330	100-127	3906	20	Ⅳ	Hemispherical

b. GW8/13 I Disconnector

Model		GW8/13-72.5I	GW8/13-126I
Rated voltage kV		72.5	126
Rated current A		630，1250
Rated peak withstand current kA		63，100
Rated short-time withstand current kA		25，40
Rated short-circuit duration s		4，4
Rated short-time power frequency withstand voltage (rms) kV		178/200*	230/260*
Rated lightning impulse withstand voltage (peak) kV		282/318*	550/625*
Rated terminal static mechanical load N	Horizontal longitudinal	1000	1250
	Horizontal transverse	750	750
	Vertical	1000	1000
Mechanical life		3000 times
Opening and closing time of the attached electric mechanism s		5±1
Weight kg		120	155

Note: For the data marked with "*", the number before "/" is the parameter value measured at an altitude of 2000 m and the number after "/" is the parameter value measured at an altitude of 1000 m

3. Lightning Arrestor

System nominal voltage kV	Lightning arrester model	Lightning arrester rated voltage kV	DC 1mA reference voltage ≥kV	Residual voltage under 8/20μs lightning impulse current ≤kV	2ms Square wave A	4/10μs large current kA
126	YH1.5W-60/144	60	86	144	400	10（65）
126	YH1.5W-72/186	72	105	186	400	10（65）
126	YH1.5W-73/200	73	107	200	400	10（65）
252	YH1.5W-144/320	144	205	320	400	10（65）

4. Service and Installation Conditions
Ambient temperature: -50℃~ 50℃;
Altitude: ≤ 2000m;
Wind pressure: ≤ 700Pa;
Ice thickness: ≤ 20 mm;
Pollution class: class III and IV;
Seismic intensity: ≤ Mercalli IX.
There should be no inflammable, explosive, corrosive materials or violent vibration in the mounting site.

Related Names
Grounding Protection Apparatus | Electrical Appliances | Electrical Transformer Protector

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