An SVG and an electricity meter sit on opposite ends of the power-quality chain: one injects or absorbs reactive voltamperes in real time, the other records the resulting kWh, kVArh, and PF for billing and load analysis. Specifying both correctly is a two-step decision, and confusing their roles is a common error in low-voltage switchboard design.
SVG is a self-commutated IGBT converter that delivers capacitive-to-inductive reactive compensation in the -1 to +1 range with bi-directional linear adjustment [S5]. Electricity meters, by contrast, are passive measurement devices that quantify the energy the SVG has already shaped, typically Class 0.5S or Class 1 for revenue and Class 2 for sub-metering. The two products rarely compete, but they often appear on the same single-line diagram.
What an SVG Actually Does
A static var generator, also called STATCOM (Static Synchronous Compensator), is a modern static var compensator built on a self-commutation converter circuit and represents the latest technology in the field of modern static var compensation [S2]. It stabilises network voltage, reduces system loss, strengthens transmission capacity, increases transient voltage limit, suppresses harmonics, and shrinks substation footprint compared with legacy thyristor-switched capacitor (TSC) banks.
Sineng's product brochure lists the operating envelope as -1 to +1 capacitive/inductive compensation with fast bi-directional linear adjustment of reactive power, packaged in a cubicle-type enclosure suitable for medium-voltage retrofits [S5]. Modeling-Tech confirms the topology: a chain SVG uses a bridge converter built from fully controlled power electronic devices and is now standard equipment in wind farms, photovoltaic stations, and other renewable energy plants where grid code PF compliance must be met at the point of common coupling [S6].
What an Electricity Meter Actually Does
An electricity meter does not change the network; it quantifies the energy that has already flowed. Modern electronic meters sample voltage and current channels, compute active power (kW), reactive power (kVAr), apparent power (kVA), PF, and integrate them over time to produce kWh and kVArh registers. Accuracy classes for revenue metering typically range from Class 0.2S (transmission boundary) through Class 0.5S and Class 1 (commercial/industrial) down to Class 2 (residential sub-metering). [S2]
Meters are the only way to verify whether the SVG has delivered its promised PF correction. A plant that installs a 500 kVAr SVG without a Class 0.5S meter at the PCC cannot prove utility-bill savings or respond to demand-charge penalties. For harmonics-aware billing under modern tariff structures, the meter must also capture THD-V and THD-I per IEC 61000-4-30, a capability not all Class 1 meters offer.
Selection Criteria: SVG Side
Four numbers drive SVG selection: compensation range (-1 to +1 pf target, sometimes ±0.8 to ±1), response time (typically under 5 ms full step, often under 1 ms for chain-link MV units), rated voltage (0.4 kV LV, 6-10 kV MV, 35 kV for transmission-grade), and harmonic performance (typical THD-i contribution below 3-5% at full load). Decision criteria compared: [S2]
Criterion 1 — Load profile: Constant-baseline industrial loads (pumps, compressors, HVAC) are economical with TSC banks, but highly variable loads (welders, rolling mills, elevators, arc furnaces) demand an SVG because capacitor-step switching cannot track sub-cycle reactive swings. Criterion 2 — PF target: Utilities in most Chinese provinces require PF ≥ 0.90 at the billing meter; EU grid codes under EN 50549 require PF ≥ 0.95 for generators above certain thresholds. SVG guarantees continuous PF, not stepped. Criterion 3 — Harmonics: If the load already injects harmonics (variable-frequency drives, rectifiers), a passive or active harmonic filter may be required alongside or instead of a pure SVG. Criterion 4 — Footprint: Chain-link MV SVG at 6-10 kV typically occupies 30-50% of the floor area of an equivalent TSC + TCR bank at the same MVAr rating.
Selection Criteria: Meter Side
Three decisions govern meter selection. First, accuracy class: Class 0.5S is the workhorse for industrial billing in most jurisdictions; Class 0.2S is reserved for transmission interchange where settlement dollars are large. Second, measurement channels: a basic meter records kWh import/export; a smart meter adds kVArh, PF, demand windows, and TOU registers. Third, communication: DLMS/COSEM, Modbus RTU/TCP, and IEC 61850 are common in MV switchgear; Modbus dominates LV retrofits. [S2]
The meter must also tolerate the harmonics the SVG leaves behind. A Class 1 meter specified for 50/60 Hz pure sinewave will under-read by 1-3% on a bus with 8% THD-V, which is exactly the bus an SVG is supposed to clean. Specifying IEC 62053-22 / IEC 62053-24 compliant meters for wideband harmonic content is a low-cost insurance policy for revenue accuracy. The relationship between the static var generator and the meter is therefore causal and verifiable: the meter should be downstream of the SVG at the PCC, and the readings should reflect the corrected PF.
Use-Case Split: When to Buy Which
Buy an SVG when reactive power swings faster than 1 second, when PF penalties appear on the utility bill, or when the plant is connecting renewable generation subject to EN 50549, IEEE 1547, or Chinese GB/T 19963 reactive-power requirements. The cubicle-type SVG from kitairu.net suppliers targets exactly this brief: strengthen transmission high voltage, dynamic compensation, and reduced harmonic output for utility and industrial substation retrofits [S2]. Sineng's product line confirms a market split between MV chain-link units (6-10 kV, several MVAr) and LV modular units (0.4 kV, 50-500 kVAr) [S5].
Buy an electricity meter when you need to bill a tenant, settle with the utility, log load profile for energy management, or verify that the SVG you already installed is actually delivering the contracted kVAr. A 10,000 m² production facility with 500 kVAr SVG and 10 tenants will fail on day-one if the LV bus lacks a Class 0.5S meter with kVArh and PF logging.
Integration Pitfalls
Three failure modes recur. First, no meter at the PCC: the SVG compensates locally, but the utility meter at the boundary still sees uncorrected load if the SVG is installed downstream of a long feeder with its own reactive drop. Always verify the meter's location relative to the compensation point. Second, SVG sized on nameplate reactive rather than measured reactive: a 500 kVAr SVG is wasted on a 200 kVAr peak load, and undersized on a transient 800 kVAr load. Use a Class 0.5S meter or a power-quality analyser for at least 7 days before sizing. Third, ignoring resonance: LV SVG interacts with existing capacitor banks and transformer inductance; a sweep or an ETAP / PSCAD study is the only safe way to avoid harmonic resonance between SVG output filters and the network. [S2]
For plants comparing topologies, the active harmonic filter versus SVG spec map lays out the decision boundaries for harmonic-dominant versus reactive-dominant loads, and is a useful cross-reference when the load profile shows both problems. Suppliers like YT-Electric bundle active harmonic filter, static var generator, hybrid var compensator, MV STATCOM, and energy storage on a single platform, signalling the convergence of power-quality product lines [S7].
Standards and Sourcing Anchors
SVG equipment generally complies with IEC 61954 (testing of thyristor valves for SVC) and IEEE 1031 (functional spec for SVC), with grid interconnection governed by IEEE 1547 and EN 50549. Electricity meters are governed by IEC 62053-22 (Class 0.2S/0.5S/1 active energy), IEC 62053-24 (Class 1/2/3 reactive energy), and IEC 62056 (DLMS/COSEM data exchange). Harmonic measurement on the meter side follows IEC 61000-4-30 and IEC 61000-4-7. None of the sources [S1]-[S7] cite specific revision dates, so any revision-year claim should be verified against the IEC catalogue directly.
Zhuhai Wanlida Electrical Automation lists static var generator, SVG/STATCOM, and active power filter on a single supply line with 500 sets per year capacity and accepts L/C and T/T payment terms [S3]. The HK-series high-voltage SVG from kitairu.net suppliers is positioned for medium-voltage bus compensation in industrial feeders [S4]. Sourcing signal to track: convergence between SVG, active harmonic filter, and energy storage product lines, with multiple Guangdong and Jiangsu vendors now offering hybrid packages on shared IGBT platforms [S7].
For component-level specifications, see function generator.