JDZ(X)10-10-3、6/10A(REL-10) Voltage Transformer
Visão Geral do Produto
O transformador de tensão JDZ(X)10-10-3,6/10A(REL-10) é um transformador de tensão totalmente fechado, tipo seco, de resina fundida, projetado para sistemas de energia CA internos de 10kV (Um=12kV). Ele emprega uma estrutura de isolamento integral de resina epóxi fundida a vácuo com um resistor limitador de corrente dedicado embutido. A unidade serve a múltiplas funções, incluindo medição de tensão, medição de energia, proteção de relé e substituição de fusíveis. É usado principalmente em média tensão interna switchgear (por exemplo, série KYN28) para monitoramento de tensão, supervisão de isolamento e aquisição de sinais de proteção, sendo amplamente aplicado em sistemas de distribuição de 10kV, subestações pré-fabricadas e unidades de anel.
Principais Recursos do Produto
Isolamento e Desempenho Elétrico
Fully Enclosed Epoxy Resin Cast Insulation: The entire unit is formed by vacuum casting with epoxy resin, resulting in a void-free interior with excellent insulation performance. It withstands the 12kV system operating voltage and passes power-frequency and impulse withstand voltage tests. The insulation has a long service life with no leakage or oil contamination risk, making it suitable for oil-free indoor distribution applications.
Integrated Current-Limiting Protection: The built-in current-limiting resistor replaces conventional fuses to provide overcurrent protection for the voltage transformer, preventing damage from secondary circuit short circuits or overcurrent events, improving system operational reliability, and simplifying secondary circuit design within the switchgear.
Wide Voltage Ratio Compatibility: Supports multiple voltage ratios (e.g., 10/0.1kV, 10/0.1/0.1kV, etc.) with simultaneous multi-tap secondary outputs for metering, protection, and insulation supervision. Accuracy classes are customizable (0.2/0.5/1 / 3P/6P, etc.) to meet diverse application requirements.
Low Partial Discharge Design: Advanced casting process ensures partial discharge level ≤10pC, preventing insulation aging caused by long-term partial discharge activity and improving long-term operational reliability.
Estrutura e Características de Instalação
Fully Enclosed Dry-Type Construction: The integrally cast structure has no exposed core or live parts, with a protection degree of IP20, no fire hazard, compact dimensions, small footprint, and compatibility with standard switchgear installation dimensions.
Dual Model Design: JDZ10-10 is the single-winding type; JDZX10-10 is the residual-voltage winding type (for insulation supervision). Models can be selected flexibly based on system requirements to accommodate different switchgear types and protection schemes.
Clear Terminal Identification: Primary high-voltage terminals are clearly labeled; secondary terminals are protected by transparent covers for convenient wiring, preventing miswiring and short circuits, while also guarding against accidental secondary circuit short circuits. Terminal layout complies with switchgear internal wiring standards.
Flexible Installation: The bottom metal mounting base includes fixing holes to support bolted installation. Compatible with horizontal indoor switchgear mounting, it provides secure installation with excellent vibration resistance for compact panel arrangements.
Funcionalidades Operacionais e de Manutenção
Operação sem Manutenção: A construção seca e isenta de óleo elimina riscos de vazamento e incêndio. O corpo fundido em resina epóxi possui alta resistência mecânica, resistência ao impacto e resistência ao envelhecimento, permitindo operação de longo prazo sem manutenção, reduzindo custos de O&M e eliminando a necessidade de substituição periódica de fusíveis.
Wide Temperature Operation: Suitable for ambient temperatures from -30°C to +70°C. Epoxy resin performance remains stable across temperature extremes with no risk of embrittlement or deformation, accommodating diverse regional climate conditions.
High-Reliability Design: Windings are wound with enameled copper wire; the core is laminated from high-quality silicon steel sheets. The unit operates with low losses and low heat generation, withstands system switching overvoltages and lightning impulse overvoltages, and incorporates a stable current-limiting resistor to ensure reliable protection performance.
Parâmetros Técnicos (Especificações Típicas)
| Categoria de Parâmetro | Item | Especificação Técnica |
| Parâmetros Elétricos | Tensão do Sistema | 10kV CA (Um=12kV) |
| Frequência Nominal | 50Hz | |
| | Tensão Primária Nominal | 10kV | |
| Tensão Secundária Nominal | 100V (metering/protection); 100/3V (insulation supervision, JDZX type) (customizable) | |
| Corrente Nominal de Saída | 3A / 6A / 10A (with built-in current-limiting protection) | |
| | Classe de Precisão de Medição | 0.2 / 0.5 / 1 | |
| | Classe de Precisão de Proteção | 3P / 6P | |
| | Power-Frequency Withstand Voltage (Primary) | 42kV / 1min, sem ruptura | |
| | Tensão de Resistência ao Impulso (Pico) | 75kV, sem ruptura | |
| | Nível de Descarga Parcial | ≤10pC | |
| Resistência de Isolamento (Alta Tensão para Baixa Tensão e Terra) | ≥1000MΩ | |
| Parâmetros Estruturais e de Materiais | Meio Isolante | Moldagem completa em resina epóxi |
| | Grau de Proteção | IP20 | |
| | Método de Montagem | Indoor post-type bolted mounting | |
| | Classe Térmica de Isolamento | Classe B (130°C) | |
| Parâmetros Ambientais | Altitude de Operação | ≤2000m (personalização para alta altitude disponível) |
| | Temperatura Ambiente de Operação | -30°C a +70°C | |
| | Temperatura Ambiente de Armazenamento | -40°C a +85°C | |
| Umidade Relativa | ≤95% (sem condensação) | |
| Normas Aplicáveis | Normas Nacionais | GB 1207 Transformadores de Tensão; GB/T 20840.1 Transformadores de Instrumento — Parte 1: Requisitos Gerais; GB/T 20840.3 Transformadores de Instrumento — Parte 3: Requisitos Adicionais para Transformadores de Tensão Indutivos |
Escopo da Aplicação
Classe de Tensão Aplicável: Sistemas de energia CA internos de 10 kV (Um=12 kV).
Cenários de Aplicação Típicos:
Voltage measurement, energy metering, and relay protection in indoor medium-voltage switchgear (KYN28 series) and prefabricated substations;
Sistemas de distribuição de 10kV em subestações de distribuição, empresas industriais e de mineração, edifícios comerciais e parques industriais;
Aquisição de sinais de monitoramento, controle e proteção de tensão em sistemas de automação de energia;
10kV switchgear applications requiring simplified secondary circuits and fuse replacement, suitable for compact switchgear designs.
Functional Purpose: Converts high system voltage to a standardized low voltage (100V) in proportion to provide voltage signals for metering instruments, protection devices, and control equipment, while achieving electrical isolation between the primary and secondary systems. The built-in current-limiting resistor provides overcurrent protection; the JDZX type can also serve as a voltage signal source for insulation supervision devices to monitor system earth faults.
Condições de Operação
Condições Normais de Operação
Altitude: ≤2000m;
Temperatura ambiente: -30°C a +70°C, sem flutuações severas de temperatura;
Umidade Relativa: ≤95% (sem condensação);
Environmental Conditions: Free from corrosive gases, flammable/explosive media, severe vibration and shock, and significant dust or salt spray;
Método de Instalação: Montagem interna em poste, longe da luz solar direta, chuva e condensação.
Condições Operacionais Especiais (Requerendo Personalização)
Altitude superior a 2000m;
Temperatura ambiente fora da faixa de -30°C a +70°C;
Ambientes severamente poluídos, com névoa salina ou quimicamente corrosivos;
Condições de operação de alta vibração ou alto impacto;
Relações de tensão não padronizadas, classes de precisão ou dimensões de montagem.
Instalação e Manutenção
Requisitos de Instalação
Pre-Installation Inspection: Inspect the voltage transformer for external damage — the cast body shall be free of cracks, voids, and breakage; terminal markings shall be clear and all accessories present. Verify that the model, specification, voltage ratio, rated current, and current-limiting protection function conform to design requirements.
Mechanical Fixing: Position the voltage transformer at the designated mounting location within the switchgear and secure it through the bottom mounting holes using bolts. Ensure the installation is firm with no looseness or misalignment, and that the mounting surface is level to avoid eccentric loading.
Primary (High-Voltage) Side Wiring: Connect the high-voltage terminals per design requirements, ensuring tight connections with good contact. Maintain adequate safety clearances between the high-voltage leads and earthed parts or other live parts to prevent flashover.
Secondary (Low-Voltage) Side Wiring: Connect the low-voltage terminals according to markings, with separate wiring for metering, protection, and insulation supervision circuits. Ensure correct wiring. The secondary circuit must never be short-circuited and must be reliably earthed (single-point earthing) to prevent overvoltage.
Insulation Testing: After installation, measure the insulation resistance (HV to LV and earth; LV to earth) to confirm insulation performance meets requirements. Verify secondary circuit wiring is correct with no short circuits or open circuits.
Pontos Chave de Manutenção
Periodically inspect the voltage transformer externally — the cast body shall show no cracks, damage, or discharge marks; primary terminals shall show no looseness or oxidation; secondary terminal protective covers shall be intact.
Periodically inspect primary and secondary connections for tightness, with no signs of overheating or discoloration. Verify secondary circuit earthing is reliable with no short circuit or open circuit risk.
Periodically test insulation resistance and voltage ratio to confirm metering and protection accuracy meets requirements, and verify that the current-limiting protection function is operating correctly.
Clean dust and contamination from the transformer surface; prevent oil or corrosive substances from adhering; keep the equipment dry and clean.
In the event of cracks, discharge, overheating, voltage ratio deviation, or protection function failure, de-energize immediately for inspection and replace the equipment if necessary. Do not operate a faulty unit.
Precauções
Secondary windings must never be short-circuited. Should a secondary circuit short circuit occur during operation, the current-limiting resistor will act to protect the equipment; however, the fault must still be investigated and cleared promptly. During maintenance, the secondary circuit must be reliably open-circuited and earthed.
Avoid mechanical impacts or shocks to the cast body during installation to prevent epoxy resin cracking or insulation damage that would compromise dielectric performance.
Primary side wiring must use dedicated insulated leads with adequate safety clearances maintained from earthed parts and other live parts to prevent phase-to-phase or phase-to-earth flashover.
Equipment earthing must be reliable — the base earthing terminal must be securely bonded to the switchgear earthing busbar to ensure proper equipment earthing.
During storage, place the unit in a dry, well-ventilated, cool environment away from direct sunlight, high temperatures, humidity, and compressive loads to prevent aging or deformation of the cast body.
A instalação, a colocação em funcionamento e a manutenção devem ser realizadas por pessoal elétrico qualificado, em estrita conformidade com os procedimentos operacionais de segurança elétrica.
Configuração de Fornecimento Padrão
| Não. | Item | Propósito |
| 1 | JDZ(X)10-10-3、6/10A(REL-10) Voltage Transformer Body | Core unit for voltage transformation, isolation, current-limiting protection, and signal acquisition |
| 2 | Parafusos e Arruelas de Montagem | Para fixação mecânica do transformador de tensão |
| 3 | Tampa Protetora Transparente do Terminal Secundário | Protege terminais de fiação de baixa tensão contra ligações incorretas e curtos-circuitos |
| 4 | Manual do Produto | Installation, operation, and maintenance guide including current-limiting protection description |
| 5 | Product Certificate of Conformance and Factory Test Report | Product quality and performance documentation including voltage ratio, error, and current-limiting protection test data |
Normas e Certificações Aplicáveis
This product complies with national standards GB 1207 Voltage Transformers, GB/T 20840.1 Instrument Transformers — Part 1: General Requirements, and GB/T 20840.3 Instrument Transformers — Part 3: Additional Requirements for Inductive Voltage Transformers, and has passed type tests. Performance meets the operational requirements of 10kV indoor power systems.
Apêndice: Desenho do Esboço do Produto
