1. OVERVIEW
1. The FR-ZJB transformer neutral point gap grounding protection device is specifically designed for the neutral point of 110KV, 220KV, 330KV, and 500KV power transformers. It enables the transformer to operate with either grounded or ungrounded neutral point, thus avoiding damage to the transformer caused by high neutral point voltage due to system faults. This product is widely used in the fields of power, metallurgy, petrochemical, construction, and environmental protection.
2. Generally speaking, rod gaps have highly uneven electric fields, unstable discharge voltages, and large dispersion, which determines their poor protective performance. Sphere gaps have uniform electric fields, stable discharge voltages, and small dispersion, resulting in better protective performance. Sphere gaps are easier to adjust on-site, allowing users to adjust them according to their local conditions. On the other hand, aligning rod gaps with pointed tips is particularly difficult, making on-site adjustment more challenging. Sphere gaps require high-quality stainless steel balls with silver plating, which increases the cost and has strict fixing requirements. Therefore, many manufacturers choose rod gaps to reduce costs without considering the effectiveness.
3. Current transformers selection: Dry-type current transformers cast with epoxy resin are used. The current transformers are installed in stainless steel enclosures, which are not affected by environmental conditions and have a long service life. This ensures that the protection system does not experience false tripping or failure to trip, and remains stable and reliable.
2. PRODUCT FEATURES
1). Innovative design, easy installation The FR-ZJB transformer neutral point gap grounding protection device integrates electrical equipment such as isolation switches, zinc oxide surge arresters, discharge gaps, and current transformers into a complete set of equipment. It has the characteristics of small size, convenient installation and debugging, and high reliability.
2). Effective protection, stable characteristics The FR-ZJB transformer neutral point gap grounding protection device mainly adopts a spherical discharge gap, which has higher accuracy, less dispersion, and stable characteristics compared to the conventional rod-shaped discharge gap. It accurately and effectively coordinates with the characteristics of the surge arrester and the insulation of the main transformer, with a large thermal capacity and less susceptibility to burnout. It improves the safety and effectiveness of protection.
3). Flexible configuration, convenient to use The FR-ZJB transformer neutral point gap grounding protection device adopts a spherical gap, but can also be equipped with a rod-shaped gap according to user requirements. The surge arrester and isolation switch can be flexibly combined and selected according to engineering needs. The operation of the isolation switch can be manually or electrically controlled according to project requirements. The technical parameters of the gap can be adjusted and calibrated at the factory or on-site.
4). Strong technical capabilities, attentive service Our company is a professional manufacturer with strong technical capabilities. We provide timely technical communication and consultation before sales. We also offer installation and technical guidance according to user requirements after sales
3. GENERAL WORKING CONDITIONS
1). Suitable for indoor and outdoor use.
2). Ambient temperature: not lower than -40°C, not higher than +55°C; relative humidity: not greater than 95% (25°C).
3). Altitude does not exceed 4000m, and special customization is available for altitudes above 4000m according to actual conditions.
4). Suitable for areas with seismic intensity of 8 degrees or below; maximum wind speed does not exceed 35m/s.
5). Grid frequency: 58-62Hz (for 60Hz systems), 48-52Hz (for 50Hz systems).
6). The air in the installation location should not contain chemically corrosive gases and vapors, and should be free of explosive dust.
4. INSTRUCTIONS FOR USE
1). When placing an order, please provide the rated voltage of the transformer, the turns ratio of the current transformer, the rated current of the isolation switch, the form of the operating mechanism, and the rated voltage of the zinc oxide arrester. If not specifically specified, delivery will be made according to the technical data standards specified in this manual.
2). Two secondary windings with a ratio of 0.5/10P should be provided for the secondary side of the current transformer for measurement and protection purposes. When not in use, it should be short-circuited.
3). The wire cross-section and type connected to the neutral point of the transformer shall be determined by the user.
5. INSTALLATION REQUIREMENTS
1). During installation, the equipment can be lifted using a base, and the lifting rope should not be tied to the porcelain column to prevent damage to the equipment.
2). The fixing mechanism and the column for installing the main body are not included in the scope of supply of this device. They are to be fabricated on-site by the installation unit or steel columns and anchor bolts can be provided according to user requirements (i.e., supplied above ground level).
3). The equipment should be reliably grounded.
4). The actual supply of the product shall prevail in terms of appearance and dimensions.
6. BASIC PARAMETERS
| Product Model |
Transformer Rated Voltage
kV |
Transformer Neutral Point Withstand Voltage |
Isolation Switch |
Zinc Oxide Surge Arrester |
Discharge Gap |
Current Transformer |
Lightning Full Wave and Impulse Withstand Voltage
kV
(peak) |
1min Power Frequency
kV
(RMS) |
Rated Current
A |
Operating Mechanism |
Rated Voltage
kV
(RMS) |
Continuous Operating Voltage kV
(RMS) |
DC 1mA Reference Voltage
kV
(not less than) |
8/20µs Lightning Impulse Current Residual Voltage kV
( peak ) |
Power Frequency Discharge Voltage kV
±10%
(RMS) |
Type |
Turn Ratio |
FR-ZJB-
110 |
110 |
350 |
550 |
630 |
CS14GA
(manual) or
FR6B
(electric motor) |
72 |
58 |
103 |
186 |
83 |
Epoxy Resin Cast Fully Enclosed Pillar Type 10kV
100/5
200/5
300/5
400/5
500/5
600/5 |
| FR-ZJB- 220 |
220 |
160 |
230 |
630 |
144 |
116 |
205 |
320 |
166 |
| FR-ZJB- 330 |
330 |
440 |
292 |
630 |
207 |
166 |
292 |
440 |
252 |
7. LEAD TIME:
The delivery time is usually determined by the type and quantity of the product, typically ranging from 15 to 20 days.
8. WHY CHOOSE US?
1), Innovation Strength
Fenarro has a professional research and development team consisting of over 30 technical engineers. The production design incorporates advanced international technology and is equipped with updated equipment systems. It follows the highest international standards for experiments and has invested over 30 million US dollars in research and development expenses.
2), Quality Control
Fenarro has over 40 professional testing equipment, 5 production lines, and 2 measurement centers, with strict quality control processes in place to ensure that our products meet international certification requirements.
3), Quantity and Productivity
Fenarro has six workshops and nearly 230 well-trained employees, with the help of modern automated production lines, our annual production capacity is 150,000 sets of equipment.
4), Our Service
I). By promptly addressing customer inquiries and concerns, we provide a quick response during the pre-sales period to secure the orders and achieve success in the B2B realm.
II). Our service is synonymous with excellence throughout the production process. We pride ourselves on our meticulous attention to detail, our team of experienced professionals, effective communication, and unwavering commitment to timeliness.
III). Our team of experts is dedicated to solving any issues that may arise after your purchase. We pride ourselves on our prompt and effective communication, ensuring that you are always kept in the loop and informed of any updates or progress.
IV). The essence of our warranty program lies in its ability to instil confidence in our customers. By providing a long period quality warranty, we aim to eliminate any doubts that may arise during the decision-making process.
9. FAQ
Q: Are you a factory or a trading company?
A: We are a factory.
Q: How to place an order?
A: Inquire with us → Customize with your design or sample → Inform us of your usage scenario → Receive our product design recommendation → Negotiate details → Confirm sample → Sign contract/deposit → Mass production → Goods ready for shipment → Delivery → Further cooperation.
Q: How about sample orders?
A: We provide samples for reference, please contact us for details. Once we charge you for the sample fee, please rest assured that the fee will be refunded when you place a formal order.
Q: What shipping methods are available?
A: We offer various shipping methods such as express, sea, air, and land transportation. If you need to specify other shipping methods, please contact us.
Q: How long does it take for delivery and shipment?
A: Delivery time depends on the type and quantity of products you order. Usually, it takes 15-20 days.
Q: What can I do if some products are missing from my package?
A: Please contact our support team, we will confirm your order contents with the packaging and compensate for the missing products according to the actual situation. We apologize for any inconvenience caused.
Q: How to confirm payment?
A: We accept payment methods such as wire transfer and PayPal. Other payment methods are also acceptable, please contact us before making payment through other methods. Additionally, a 30% deposit is feasible, and the balance should be paid before shipment.
Audited Supplier 
){kind=link}
){kind=link}