Beijing GFUVE Instrument Transformer Manufacturer Co.,Ltd.
Beijing GFUVE Instrument Transformer Manufacturer Co.,Ltd. an exclusive current transformer, split core current transformer, current clamp & voltage transformer manufacturer.
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LZZT620-10 resin cast Three phase bushing type Zero Sequence Current Transformer for protection device
Introduction
LZZT Combined bushing type current instrument transformer is suitable for current measurement and protection of distribution equipment in 35kV or 10kV AC. power system. The combined bushing type current transformer is fit for be installed at the three-phase bushings of the ring switchgears and the switches on the wire poles, It is used to the measurement and protection of the three-phase current and the zero sequence current for the three-phase bushings and the zero sequence current for the loops of the several cables.
New magnetic material amorphous alloy or permalloy is taken to be the core of the current transformer, which has high magnetic permeability, low saturation induction density and good stability. Therefore, the measuring accuracy is higher and the instrument security factor in lower. Since the high quality silicon steel sheet metal processed by advanced technology is taken to be the core of the protection windings, the accuracy limit factor will be higher.
The circular ring core and secondary windings are poured by high quality epoxies resin or polyurethane or silicon rubber in the fire retardant plastic casing, which has the characteristic of moisture proof, stable performance and dispensing with maintenance. The cable can cross the current transformer through its internal poles quickly and uniformly.
The current transformers can be divided several kinds according to the various current ratio, accuracy and rated loads. The specific parameters are showed in the corresponding parameter tables of every type.
Outline drawing
Wiring diagrams
A, B, C 3P one Coil CT A, B, C 3P one Coil CT+ ZCT
A, C 2P one Coil CT A, C 2P one Coil CT+ZCT
A, C 2P double Coil CT A, C 2P double Coil CT+ZCT
A, B, C 3P double Coil CT
A, B, C 3P double Coil CT+ZCT
Ordering instructions
Be sure to indicate model, current ratio, accuracy class, rated load and use of the products when designing, selecting type or purchase. Special specifications could be customized.
All kinds of current transformers of different specifications and parameters can be made according to the client's demands.
LZZT Combined bushing type current instrument transformer: 1A or 5A.Secondary winding could be tapped when necessary, namely multi-current-ratio transformer.
PARAMETERS
| Technical parameters | |
| Standards | IEC60044-1; IEC 61869; NTC 2205; ANSI C57.13; GB1208-2006 |
| Rated primary current | 50-600A |
| Rated load | ≤5VA |
| Rated frequency | 50Hz or 60Hz |
| Rated secondary current | 5A or 1A |
| Rated short-time thermal current | 40kA, 1S |
| Rated continuous thermal current | 120%I1n |
| Secondary winding power-frequency voltage | 3kV, 1min |
| Instrument security factor | FS≤10 |
| Diameter(mm) | 82 |
| Mechanical parameters | |
| Dimensions (W×D×H) (mm) | 3-Φ82/125-400×175×50 |
| Weight (kg) | 6.5 |
| Operating conditions | |
| Operating temperature | -35°C to +55°C |
| Daily average temp | <+40°C |
| Storage temperature | -40°C to +70°C |
| Altitude | <3500 meters |
| Condition | No existence of severely begrimed, erosive and radioactive gas in the air. Permission of long-term operation under rated current. |
| Type | LZZT620-10 | LZZT620-10 | ||||
| Purpose | Measuring current transformer | Protection current transformer | ||||
| Ratio | Accuracy class and rated load(VA) | Accuracy class and rated load(VA) | ||||
| I1/I2 | 0.5 | 1 | 3 | 10P15 | 10P10 | 10P5 |
| 20/1 | 1 | |||||
| 40/1 | 1.5 | |||||
| 50/1 | 2.5 | 1.5 | ||||
| 75/1 | 3.75 | 1 | 2.5 | |||
| 100/1 | 2.5 | 5 | 1 | 2.5 | ||
| 200/1 | 3.75 | 5 | 7.5 | 2.5 | 5 | |
| 300/1 | 5 | 7.5 | 12.5 | 3.75 | 7.5 | |
| 400/1 | 7.5 | 10 | 15 | 5 | 12.5 | |
| 500/1 | 10 | 12.5 | 20 | 5 | 12.5 | |
| 600/1 | 12.5 | 15 | 20 | 7.5 | 15 | |
| 50/5A | 2.5 | |||||
| 100/5 | 2.5 | 1.5 | 2 | 2.5 | ||
| 150/5 | 2.5 | 3.75 | 5 | 1.5 | 2.5 | 2.5 |
| 200/5 | 2.5 | 5 | 5 | 2 | 2.5 | 2.5 |
| 300/5 | 5 | 5 | 5 | 2.5 | 2.5 | 3.75 |
| 400/5 | 7.5 | 7.5 | 10 | 3.75 | 5 | 5 |
| 500/5 | 10 | 10 | 12.5 | 5 | 5 | 7.5 |
| 600/5 | 10 | 12.5 | 15 | 5 | 5 | 10 |
| 800/5 | 12.5 | 12.5 | 15 | 5 | 10 | 10 |
| 1000/5 | 15 | 15 | 20 | 5 | 10 | 10 |
| 2000/5 | 15 | 15 | 20 | 10 | 15 | 20 |