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PT handcart
PT Handcart
PT handcart (voltage transformer handcart) is a withdrawable functional unit used for installing, connecting, switching, and repairing voltage transformers (PT) in medium and high voltage switchgear. It is widely used in 10kV and 35kV indoor AC metal enclosed switchgear systems. The product integrates voltage transformers, fuses, primary contacts, secondary aviation plugs, interlocking mechanisms, and propulsion mechanisms to achieve voltage signal acquisition, measurement, protection, measurement and safety isolation, and rapid maintenance functions. It is a core removable component in the distribution system that ensures accurate measurement, reliable protection, and safe operation and maintenance.
Features
1. Complete safety interlocking to prevent misoperation:
Equipped with comprehensive mechanical electrical interlocking, it achieves reliable positioning of the “work/test/maintenance” position, and can only be pushed/pulled out when the disconnection and grounding meet the conditions, effectively preventing risks such as pushing and pulling with load and accidentally entering the live interval.
2. Pull out structure, efficient maintenance and replacement:
Adopting a guide rail propulsion and positioning self-locking structure, the main busbar can be removed from the cabinet as a whole without dismantling, greatly reducing the time for PT replacement, testing, and maintenance, and improving the efficiency of power outage and transmission in substations and distribution rooms.
3. Stable measurement and protection accuracy, reliable operation:
Suitable for high-precision electromagnetic/capacitive voltage transformers, with good load characteristics, small phase errors, low temperature rise during long-term operation, and stable insulation performance, meeting the high-precision requirements of power metering, telemetry, and relay protection.
4.Integrated design, compact structure:
Integrated with primary contacts, high-voltage current limiting fuses, secondary wiring, grounding contacts, and position indicators, the overall layout is standardized, with sufficient insulation margin, suitable for standard cabinet interior space, and strong installation and interchangeability.
5. Strong environmental adaptability and wide applicability:
To meet the industrial and power grid operation scenarios such as indoor conventional environment, slight corrosion, humidity, and high dust, the insulation parts are made of flame-retardant and anti-aging materials, and the overall electrical and mechanical life meets the requirements of long-term frequent operation.
Rated voltage: 10kV/35kV (can be customized according to the system)
Rated frequency: 50Hz
Suitable cabinet: KYN28A-12, XGN, KYN61-40.5 and other standard medium and high voltage switchgear
Structural form: Handcart type withdrawable type, with propulsion mechanism, position interlock, secondary plug
Core configuration: Voltage Transformer (PT), High Voltage Fuse, Primary Moving Contact, Grounding Contact, Position Indicator, Operating Handle, Secondary Terminal, etc
Execution standards: GB/T 3906, GB/T 11022, DL/T 402 and other relevant electrical equipment standards
Scalable configuration: lightning arrester, harmonic suppression device, zero sequence voltage output, intelligent temperature measurement, status monitoring interface, etc
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Specification
| No. | Name | Unit | Data | |
| 1 | Rated Voltage | kV | 12 | |
| 2 | Rated Frequency | Hz | 50 | |
| 3 | Rated Current | A | 630,1250,1600,2000,2500,3150,4000 | |
| 4 | Rated 1min Power Frequency Withstand Voltage | Phase-to-phase and to ground | kV | 42 |
| Fracture | 48 | |||
| Rated Lightning Impulse Withstand Voltage Peak Value（1.2/50μs） | Phase-to-phase and to ground | 75 | ||
| Fracture | 85 | |||
| 5 | 1min Power Frequency Withstand Voltage of Secondary Circuit | 2.5 | ||
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FAQs
What is the main function of a PT handcart?
PT handcart is mainly used for installing voltage transformers, realizing system voltage acquisition, energy metering, instrument measurement, relay protection voltage input, and achieving safe isolation, testing, and rapid maintenance through withdrawable structures.
Can PT handcart be interchangeable with circuit breaker handcart?
It is not possible. PT handcart is a specialized functional unit for voltage transformers, with low circuit current and mainly focused on measurement and metering; The circuit breaker handcart is responsible for short-circuit breaking and load control functions. The appearance, interlocking, circuit, and insulation design of the two are different, and it is strictly prohibited to interchange and push them into operation.
What are the common reasons for fuse breakage during the operation of PT handcart?
Common causes include system overvoltage, resonance overvoltage, PT internal insulation failure, secondary circuit short circuit, mismatched or aging fuse selection, overvoltage impact during operation, etc. It is necessary to combine protection actions and waveform troubleshooting.
What items should be checked before pushing the PT handcart in?
Before pushing in, check that the appearance of the handcart is intact, the insulation parts have no signs of damage or discharge, the fuses are intact, the secondary plug is securely plugged in, the position indication is correct, there are no foreign objects in the cabinet, the grounding switch status meets the conditions, and the interlocking mechanism is flexible and reliable.
What impact will loose secondary wiring of PT handcart have?
Loose secondary wiring can lead to abnormal voltage signals, inaccurate measurement, false/refused operation of protection devices due to voltage loss, and telemetry data jumps. In severe cases, it can affect system monitoring and fault diagnosis, and regular tightening inspections are necessary.
Related Applications
10kV distribution room and switching station of urban power grid:
Widely used in residential areas, commercial complexes, and industrial parks in urban areas, 10kV distribution rooms and ring network switch stations provide standard voltage signals for bus voltage monitoring, energy metering, and relay protection. They work together with switchgear to achieve safe and withdrawable operation and maintenance, meeting the high-density and high reliability power supply needs of urban distribution networks.
Substation 10kV/35kV High Voltage Room:
Applied to the low-voltage side of the main transformer, busbar segmentation, and outgoing line spacing in substations, it is used for system busbar voltage acquisition, synchronous operation, protection measurement and control, reactive power compensation control, etc. Through PT handcart, rapid testing, rotation, and maintenance of voltage transformers are achieved, reducing the risk of power outages throughout the station and improving the safety and efficiency of substation operation and maintenance.
Self owned power plants and industrial distribution systems for industrial and mining enterprises：
Suitable for high-voltage distribution systems in large enterprises such as mining, metallurgy, chemical, manufacturing, etc., it provides stable standard voltage for motor control, frequency conversion devices, reactive power compensation, and comprehensive protection devices. In continuous production scenarios, it achieves non-stop main system maintenance PT, reduces production downtime, and ensures stable power supply for industrial loads.
New energy station (photovoltaic, wind power) box transformer/high-voltage room：
Box type substations and high-voltage distribution rooms used for photovoltaic power plants and wind farms, collecting grid voltage and bus voltage for grid control, power quality monitoring, reverse power protection, anti islanding protection, and cooperating with withdrawable structures for rapid on-site station inspection, fault isolation, and equipment replacement, adapting to the decentralized and remote operation and maintenance characteristics of new energy stations.
Infrastructure and Public Building Power Supply System：
Applied to important load power supply systems such as subways, airports, hospitals, data centers, and rail transit, it ensures accurate voltage measurement and reliable protection actions. The safety interlocking and fast withdrawable characteristics of PT handcarts meet the operational requirements of high availability, high safety, and minimal power outages for critical loads.
