ZW20 Integrated Primary and Secondary Pole-Mounted Circuit Breaker (Common Enclosure Type)

Features :
Customizable
Voltage adjustment tap
Stainless steel hardware
High-grade silicon-steel core
Copper or aluminum windings available
Low loss, low noise, low partial discharge, high efficiency, high reliability

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Product Overview：

The ZW20 primary-secondary integrated complete set pole-mounted circuit breaker (tank type) (hereinafter referred to as the boundary circuit breaker) is a new type of product by our company. The boundary circuit breaker is a multifunctional intelligent device integrating four major types of switches: vacuum circuit breaker, vacuum load switch, recloser, and section switch. It mainly consists of three components: the vacuum circuit breaker body, the FDR-type controller, and an external voltage transformer (note: dual-side PTs are optional in distribution automation looped network lines). The product is widely used as a section disconnecting switch and tie switch in 10kV and 13kV urban and rural distribution overhead looped network lines, serving as an automatic switching device for load distribution in looped networks. It can be used as a boundary switch (commonly known as a "watchdog") on branch lines supplying large customers, and as a recloser and section switch in feeder overhead distribution networks. The boundary circuit breaker features remote management mode, protection control functions, and communication capabilities. It can reliably detect and determine zero-sequence current in the milliampere range and phase-to-phase short-circuit fault current within its protected zone, enabling automatic isolation of single-phase grounding faults and phase-to-phase short-circuit faults.

The main body switch adopts vacuum arc extinguishing and uses a mixed gas of SF6 and N2 for insulation. The enclosure incorporates gas sealing, explosion-proof, and insulation structural technologies introduced from Japan, Germany, and France, resulting in excellent overall sealing performance. The internally filled SF6 and N2 mixed gas does not leak and is unaffected by external environmental conditions. The spring operating mechanism has been miniaturized and its performance optimized, offering significantly higher operational reliability than traditional domestic spring mechanisms.

Product Model and Meaning：

Rated short-circuit breaking current (kA)

Rated current (A)

Rated voltage (kV)

Design number

Service condition: Outdoor

Arc extinguishing medium: Vacuum

Environmental Conditions for Use：

1.Altitude: ≤2000m

2.Ambient temperature: Outdoor -30℃ to 55℃; Maximum annual average temperature: 20℃; Maximum daily average temperature: 30℃

3.Relative humidity: 95% (at 25℃)

4.Seismic withstand capability: Ground horizontal acceleration 0.3g, ground vertical acceleration 0.15g, with both acting simultaneously for three sinusoidal waves, safety factor 1.67

5.Seismic intensity: Grade 7

6.Maximum daily temperature difference: 25℃

7.Solar radiation intensity (at wind speed 0.5m/s): 0.1W/cm²

8.Maximum wind speed: 34m/s

9.Maximum ice coating thickness: 10mm

10.Installation location: Outdoor, at the customer responsibility boundary point of 10kV overhead lines

11.Grounding method: Neutral point ungrounded, grounded via arc suppression coil, and resistance grounded.

Main Technical Parameters：

Name			Unit	Data
Rated Voltage			kV	12
Insulation Level of the Breaking Gap	Power Frequency (Dry Test and Wet Test)			48
	Lightning Impulse Test Voltage (Peak)			85
Insulation Level Phase-to-Phase and Phase-to-Ground	Power Frequency	Dry Test		42
		Wet Test		34
	Lightning Impulse Test Voltage (Peak)			75
Rated Current			A	630
Rated Short-Circuit Breaking Current			kA	16、20、25
Rated Short-Circuit Breaking Current Operating Times			Operations	30、
Rated Short-Time Withstand Current			kA	16、20、25
Rated Short-Circuit Duration			S	4
Rated Short-Circuit Making Current (Peak)			kA	40、50、63
Rated Peak Withstand Current			kA	40、50、63
Mechanical Life			Operations	10000以上
Number of Rated Current Breaking Operations			Operations	10000
Net Weight			kg	165

Electronic current transformer：

1	Rated Current Ratio	(1) Phase current: 600A/1V (2) Zero-sequence current: 20A/0.2V
2	Accuracy Class	Phase: Protection Class 5P10, Measurement Class 0.5S Zero-sequence: Three independent current transformers with a ratio of 20A/0.2V are adopted. When the primary side input current ranges from 1A to the rated current, it meets Class 1S, Protection Class 10P30.
3	Implementation Method	Low-Power Electromagnetic Type
4	Load Impedance	≥20kΩ
5	Temperature Range	-40℃~70℃

Electronic voltage transformer：

1	Rated Voltage Ratio	(1)Phase Voltage：(10kV/√3)/3.25/√3(2) (2)Zero-Sequence Voltage：(10kV/3)/(6.5/3)
2	Accuracy Class	(1) Phase voltage: Class 0.5 (2) Zero-sequence voltage: Class 3P
3	Temperature Range	-40℃~70℃
4	Partial Discharge	≤20（1.1Um）
5	Load Impedance	≥2kΩ

Electromagnetic Current Transformer:

1	Rated Current Ratio		Phase Current: 600A/1A Zero-Sequence Current: 100A/1A
2	Accuracy Class	Class	Phase Current: Protection Class 5P10, Measurement Class 0.5 Zero-Sequence Current: When the primary side input current is 1A, the relative error is ≤3%, Class 5P10
3	Capacity	VA	Phase CT: 1VA Zero-Sequence CT: 1VA
4	Temperature Range	℃	-40℃~70℃

Zero-Sequence Voltage Transformer：

1	Turns Ratio		(10kV/√3)/(6.5V/√3)
2	Accuracy Class	Class	3P
3	Partial Discharge	pC	≤20（1.2Um/√3）
4	Insulation Resistance After Combination with Switch (Switch Phase to Ground)	MΩ	≥1000
5	Implementation Method		Capacitive Voltage Divider

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